CN1866147A - Fan control device and method - Google Patents

Abstract

A fan control device receives a target rotating speed signal to control the rotating speed of a fan, and comprises a temperature measuring module, a rotating speed modulating module and a fan driving module, wherein the temperature measuring module measures the temperature of the environment where the fan is located to generate a temperature value, the rotating speed modulating module is electrically connected with the temperature measuring module and receives the temperature value, and generates a fan control signal according to the temperature value and the target rotating speed signal, and the fan driving module is electrically connected with the rotating speed modulating module and generates a driving signal according to the fan control signal to drive the fan to act. In addition, the invention also provides a fan control method which can be applied to the fan control device.

Description

Translated fromChinese

风扇控制装置及方法Fan control device and method

技术领域technical field

本发明涉及一种风扇控制装置及方法。The invention relates to a fan control device and method.

背景技术Background technique

风扇是装设在多数的电子装置中，以利各类型的电子装置能够顺利地散热。现有风扇控制装置是可依据风扇的环境适当地依据环境温度将风扇的转速固定为全速或低速，或者是将风扇转速调整在全速与低速之间。Fans are installed in most electronic devices, so that various types of electronic devices can dissipate heat smoothly. The existing fan control device can properly fix the fan speed at full speed or low speed according to the environment temperature of the fan, or adjust the fan speed between full speed and low speed.

如图1所示，现有的一风扇控制装置1是包括一温度传感器11与一驱动芯片12，该温度传感器11是测量一环境温度并产生一测量值111，该驱动芯片12是依据该测量值111或一低限转速信号121产生一驱动信号122，一风扇2是接收该驱动信号122而动作，其中该驱动信号122可以是一脉冲宽度调制信号，该低限转速信号121可以是一固定电压电平，该风扇2是可由该驱动信号122的电压值高低或是电压脉冲之间的宽幅比例而调整转速。As shown in FIG. 1 , an existingfan control device 1 includes atemperature sensor 11 and adriver chip 12. Thetemperature sensor 11 measures an ambient temperature and generates a measuredvalue 111. Thedriver chip 12 is based on themeasurement A value 111 or a low-limitrotational speed signal 121 generates adriving signal 122, and afan 2 operates upon receiving thedriving signal 122, wherein thedriving signal 122 can be a pulse width modulation signal, and the low-limitrotational speed signal 121 can be a fixed Voltage level, the speed of thefan 2 can be adjusted by the voltage value of thedriving signal 122 or the width ratio between voltage pulses.

上述该温度传感器11可以是一热敏电阻器，如图2所示，当该环境温度越高时，该温度传感器11产生的该测量值111的电压越低。The above-mentionedtemperature sensor 11 may be a thermistor, as shown in FIG. 2 , when the ambient temperature is higher, the voltage of the measuredvalue 111 generated by thetemperature sensor 11 is lower.

如图1与图3所示，该风扇2是因该驱动信号122的电压值高低或是电压脉冲之间的宽幅比例而调整转速，而该驱动信号122又随该测量值111的大小而改变，因此该风扇2可随时反应该环境温度而调整风扇转速。As shown in FIG. 1 and FIG. 3 , the speed of thefan 2 is adjusted according to the voltage value of thedriving signal 122 or the width ratio between the voltage pulses, and thedriving signal 122 is adjusted according to the magnitude of the measuredvalue 111. Therefore, thefan 2 can adjust the fan speed in response to the ambient temperature at any time.

当该环境温度大于一温度T₁且小于一温度T₂时，该驱动芯片12是依据该测量值111调整该驱动信号122的电压值或电压脉冲间的宽幅比例，使得该风扇2得以随温度变化调整转速。When the ambient temperature is greater than a temperature_T1 and less than a temperature_T2 , thedrive chip 12 adjusts the voltage value of thedrive signal 122 or the width ratio between voltage pulses according to the measuredvalue 111, so that thefan 2 can follow the Temperature changes adjust the speed.

当该环境温度大于该温度T₂时，该驱动芯片12是维持该驱动信号122的电压值或电压脉冲间的宽幅比例而不再随该测量值111调整，使得该风扇2以全速运转不再随温度增加而增加转速。When the ambient temperature is greater than the temperature_T2 , thedrive chip 12 maintains the voltage value of thedrive signal 122 or the width ratio between the voltage pulses and no longer adjusts with the measuredvalue 111, so that thefan 2 cannot run at full speed. Then increase the speed as the temperature increases.

当该环境温度小于该温度T₁时，该驱动芯片12是依据该低限转速信号121产生该驱动信号122，该驱动信号122的电压值或电压脉冲间的宽幅比例而不再随该测量值111调整，使得该风扇2维持低速运转不再随温度降低而降低转速。When the ambient temperature is lower than the temperature_T1 , thedrive chip 12 generates thedrive signal 122 according to the low-limitrotational speed signal 121, and the voltage value of thedrive signal 122 or the width ratio between voltage pulses no longer follows the measured Thevalue 111 is adjusted so that thefan 2 maintains low-speed operation and no longer reduces the rotation speed as the temperature decreases.

然而，现有的风扇控制装置及方法仅能够随温度变化而调整风扇的转速，所以使用者无法自行降低风扇转速以减低风扇噪音，亦无法视散热或通风等需求自行调整风扇转速。也就是说，以现有的风扇控制装置及方法仅可依照温度变化而调整风扇转速，风扇的转速与温度之间是保持一固定关系，所以风扇转速与温度的特性曲线是无法做更进一步的变化，因此风扇在固定的温度下是维持固定的转速而无法产生不同的转速，所以无法视使用者需求或环境需要在固定的温度下调整风扇转速。However, the existing fan control device and method can only adjust the speed of the fan according to temperature changes, so the user cannot reduce the speed of the fan to reduce the noise of the fan, nor can the user adjust the speed of the fan according to the needs of heat dissipation or ventilation. That is to say, the existing fan control device and method can only adjust the fan speed according to the temperature change, and there is a fixed relationship between the fan speed and temperature, so the characteristic curve of the fan speed and temperature cannot be further improved. Therefore, the fan maintains a fixed speed at a fixed temperature and cannot generate different speeds, so it is impossible to adjust the fan speed at a fixed temperature according to user needs or environmental needs.

因此，本发明乃提供一种风扇控制装置及方法，以期不仅能够除依据温度自动调整风扇转速，更能够依据使用者设定而自动调整风扇转速，以依使用者需求或视环境需要在各温度情况下调增或减少风扇转速，使得风扇转速与温度的特性曲线能够更进一步变化，正是当前的重要课题之一。Therefore, the present invention provides a fan control device and method, in order not only to automatically adjust the fan speed according to the temperature, but also to automatically adjust the fan speed according to the user's setting, so as to adjust the fan speed according to the user's needs or depending on the environment. It is one of the current important issues to increase or decrease the fan speed under certain circumstances so that the characteristic curve of the fan speed and temperature can be further changed.

发明内容Contents of the invention

有鉴于上述课题，本发明的目的为提供一种能够自动调整风扇转速的风扇控制装置及方法。In view of the above problems, the purpose of the present invention is to provide a fan control device and method capable of automatically adjusting the rotation speed of the fan.

缘是，为达上述目的，依本发明的风扇控制装置是接收一目标转速信号以控制一风扇的转速，此装置包括一温度测量模块、一转速调制模块与一风扇驱动模块，其中该温度测量模块是测量该风扇所处环境的温度以产生一温度值，该转速调制模块是与该温度测量模块电连接并接收该温度值，且依据该温度值与该目标转速信号以产生一风扇控制信号，该风扇驱动模块是与该转速调制模块电连接，并依据该风扇控制信号产生一驱动信号以驱动该风扇动作。The reason is that, in order to achieve the above purpose, the fan control device according to the present invention receives a target speed signal to control the speed of a fan. This device includes a temperature measurement module, a speed modulation module and a fan drive module, wherein the temperature measurement The module measures the temperature of the environment where the fan is located to generate a temperature value, the rotational speed modulation module is electrically connected to the temperature measurement module and receives the temperature value, and generates a fan control signal according to the temperature value and the target rotational speed signal , the fan driving module is electrically connected with the rotational speed modulation module, and generates a driving signal according to the fan control signal to drive the fan to act.

为达上述目的，依本发明的风扇控制方法是接收一目标转速信号以控制一风扇的转速，本方法包括测量该风扇所处环境的温度以产生一温度值，然后依据该温度值与该目标转速信号以产生一风扇控制信号，以及依据该风扇控制信号产生一驱动信号以驱动该风扇动作。In order to achieve the above object, the fan control method according to the present invention is to receive a target speed signal to control the speed of a fan. The method includes measuring the temperature of the environment where the fan is located to generate a temperature value, and then according to the temperature value and the target The rotation speed signal is used to generate a fan control signal, and a driving signal is generated according to the fan control signal to drive the fan to operate.

承上所述，因依本发明的风扇控制装置是具有转速调制模块，转速调制模块是依据温度值与目标转速信号控制风扇的转速，故能够除依据温度值自动调节风扇转速，更能够依据目标转速信号而自动调节风扇转速，使得风扇转速与温度的特性曲线能够更进一步变化，风扇得以更依据使用者的环境及需求而适当适切地调整风扇转速。Based on the above, because the fan control device according to the present invention has a speed modulation module, the speed modulation module controls the speed of the fan according to the temperature value and the target speed signal, so it can not only automatically adjust the fan speed according to the temperature value, but also according to the target speed. The speed signal automatically adjusts the fan speed, so that the characteristic curve of the fan speed and temperature can be further changed, and the fan can adjust the fan speed more appropriately according to the user's environment and needs.

附图说明Description of drawings

图1为显示现有风扇控制装置的示意图；FIG. 1 is a schematic diagram showing a conventional fan control device;

图2为显示现有风扇控制装置的风扇转速与环境温度的曲线关系图；FIG. 2 is a graph showing the relationship between the fan speed and the ambient temperature in the conventional fan control device;

图3为显示现有风扇控制装置的温度传感器输出信号与环境温度的曲线关系图；3 is a graph showing the relationship between the output signal of the temperature sensor and the ambient temperature of the existing fan control device;

图4为显示依本发明较佳实施例的风扇控制装置的示意图；4 is a schematic diagram showing a fan control device according to a preferred embodiment of the present invention;

图5为显示依本发明较佳实施例的风扇控制装置的转速调制模块的示意图；5 is a schematic diagram showing a rotational speed modulation module of a fan control device according to a preferred embodiment of the present invention;

图6为显示依本发明较佳实施例的风扇控制装置的速限调整单元的示意图；6 is a schematic diagram showing a speed limit adjustment unit of a fan control device according to a preferred embodiment of the present invention;

图7A-7G为显示依本发明较佳实施例的风扇控制装置的风扇转速与环境温度的曲线关系图；7A-7G are graphs showing the relationship between the fan speed and the ambient temperature of the fan control device according to a preferred embodiment of the present invention;

图8为显示依本发明较佳实施例的风扇控制装置的电路示意图；8 is a schematic circuit diagram showing a fan control device according to a preferred embodiment of the present invention;

图9为显示依本发明较佳实施例的风扇控制方法的流程图；FIG. 9 is a flowchart showing a fan control method according to a preferred embodiment of the present invention;

图10为显示依本发明较佳实施例的风扇控制方法的流程图，其说明依据温度值与目标转速信号以产生风扇控制信号的步骤；以及10 is a flowchart showing a fan control method according to a preferred embodiment of the present invention, which illustrates the steps of generating a fan control signal according to a temperature value and a target speed signal; and

图11为显示依本发明较佳实施例的风扇控制方法的流程图，其说明依据目标转速信号与温度转速信号产生第二速限信号的步骤。FIG. 11 is a flowchart showing a fan control method according to a preferred embodiment of the present invention, which illustrates the steps of generating a second speed limit signal according to a target speed signal and a temperature speed signal.

附图符号说明Description of reference symbols

1：风扇控制装置1: Fan control unit

11：温度传感器11: Temperature sensor

111：测量值111: measured value

12：驱动芯片12: Driver chip

121：低限转速信号121: Low speed limit signal

122：驱动信号122: Drive signal

2：风扇2: fan

3：风扇控制装置3: Fan control unit

31：温度测量模块31: Temperature measurement module

32：风扇驱动模块32: Fan driver module

4：风扇4: fan

5：转速调制模块5: Speed modulation module

51：温度调制单元51: Temperature modulation unit

52：第一定速调制单元52: The first constant speed modulation unit

53：综合控制单元53: Integrated control unit

54：第二定速调制单元54: The second constant speed modulation unit

55：速限调整单元55: Speed limit adjustment unit

C₁-C₃：电容器C₁ -C₃ : Capacitors

D₁-D₈：二极管D₁ -D₈ : Diodes

R₁-R₁₄：电阻器R₁ -R₁₄ : Resistors

R_t：热敏电阻器R_t : Thermistor

SET₁：第一温度设定SET₁ : the first temperature setting

SET₂：第二温度设定SET₂ : second temperature setting

S_drive：驱动信号S_drive : drive signal

S_fan：风扇控制信号S_fan : fan control signal

S_target：目标转速信号S_target : target speed signal

S_temp：温度值S_temp : temperature value

S₅₁：温度转速信号S₅₁ : temperature speed signal

S₅₂：第一速限信号S₅₂ : The first speed limit signal

S₅₃：第二速限信号S₅₃ : Second speed limit signal

S₅₄：温度速限信号S₅₄ : temperature speed limit signal

S₅₅：第一目标信号S₅₅ : first target signal

S₅₆：第二目标信号S₅₆ : Second target signal

S₅₇：第三目标信号S₅₇ : Third target signal

TR₁-TR₃：晶体管TR₁ -TR₃ : Transistors

T₁-T₂：温度T₁ -T₂ : temperature

V：外接电源V: external power supply

Step1-Step6：风扇控制方法Step1-Step6: Fan Control Method

Step21-Step23：风扇控制方法Step21-Step23: Fan Control Method

具体实施方式Detailed ways

以下将参照附图，说明依本发明较佳实施例的风扇控制装置及方法。The fan control device and method according to preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

如图4所示，依本发明较佳实施例的风扇控制装置3是接收一目标转速信号S_target以控制一风扇4的转速，该风扇控制装置3包括一温度测量模块31、一转速调制模块5与一风扇驱动模块32。As shown in Figure 4, thefan control device 3 according to the preferred embodiment of the present invention receives a target speed signal S_target to control the speed of a fan 4, thefan control device 3 includes atemperature measurement module 31, aspeed modulation module 5 and afan drive module 32.

该温度测量模块31是测量该风扇4所处环境的温度以产生一温度值S_temp，该转速调制模块5是与该温度测量模块31电连接并接收该温度值S_temp，且依据该温度值S_temp与该目标转速信号S_target以产生一风扇控制信号S_fan，该风扇驱动模块32是与该转速调制模块5电连接，并依据该风扇控制信号S_fan产生一驱动信号S_drive以驱动该风扇4动作。在本实施例中，该目标转速信号S_target与该驱动信号S_drive是可为脉冲宽度调制信号(Pulse Width ModulationSignal)。该目标转速信号S_target是可由其它温度控制组件所产生，例如主机板上的温度监控芯片，或PWM控制芯片，或是微处理机所产生的数字输出等等。Thetemperature measurement module 31 measures the temperature of the environment where the fan 4 is located to generate a temperature value S_temp , the rotationalspeed modulation module 5 is electrically connected to thetemperature measurement module 31 and receives the temperature value S_temp , and according to the temperature value S_temp and the target speed signal S_target to generate a fan control signal S_fan , thefan drive module 32 is electrically connected to thespeed modulation module 5, and generates a drive signal S_drive according to the fan control signal S_fan to drive the fan. Fan 4 operates. In this embodiment, the target rotational speed signal S_target and the driving signal S_drive may be pulse width modulation signals (Pulse Width Modulation Signal). The target speed signal S_target can be generated by other temperature control components, such as a temperature monitoring chip on the motherboard, or a PWM control chip, or a digital output generated by a microprocessor.

如图5所示，在本实施例中，该转速调制模块5包括一温度调制单元51、一第一定速调制单元52与一综合控制单元53。As shown in FIG. 5 , in this embodiment, the rotationalspeed modulation module 5 includes atemperature modulation unit 51 , a first constantspeed modulation unit 52 and anintegrated control unit 53 .

该温度调制单元51是接收该温度值S_temp并依据该温度值S_temp与该目标转速信号S_target以产生一温度转速信号S₅₁，该第一定速调制单元52是依据该目标转速信号S_target产生一第一速限信号S₅₂，该综合控制单元53是依据该温度转速信号S₅₁与该第一速限信号S₅₂至少二者其中之一以产生该风扇控制信号S_fan。Thetemperature modulation unit 51 receives the temperature value S_temp and generates a temperaturespeed signal S 51 according to the temperature value S_temp and the target speed signal S_target . The first constant speed modulation unit₅₂ generates a temperaturespeed signal S 51 according to the target speed signal S_target generates a first speed limit signal S₅₂ , and theintegrated control unit 53 generates the fan control signal S_fan according to at least one of the temperature speed signal S₅₁ and the first speed limit signal S₅₂ .

该第一定速调制单元52是依据该目标转速信号S_target与一第一温度设定SET₁产生该第一速限信号S₅₂，其中该第一温度设定SET₁是指定该风扇4维持固定转速的温度范围。The first constantspeed modulation unit 52 generates the first speed limit signal S₅₂ according to the target speed signal S_target and a first temperature setting SET₁ , wherein the first temperature setting SET₁ specifies that the fan 4 maintains Fixed speed temperature range.

在本实施例中，该转速调制模块5更包括一第二定速调制单元54，该第二定速调制单元54是依据一温度速限信号S₅₄与该目标转速信号S_target产生一第二速限信号S₅₃，其中该温度速限信号S₅₄是由该温度调制单元51依据该温度值S_temp所产生，该风扇驱动模块32更可依据该第二速限信号S₅₃产生该驱动信号S_drive，该风扇4是依据该驱动信号S_drive维持固定转速。In this embodiment, the rotationalspeed modulation module 5 further includes a second constantspeed modulation unit 54, which generates a second constantspeed modulation unit 54 according to a temperature speed limit signal_S54 and the target rotational speed signal S_target . The speed limit signal S₅₃ , wherein the temperature speed limit signal S₅₄ is generated by thetemperature modulation unit 51 according to the temperature value S_temp , and thefan drive module 32 can further generate the drive signal according to the second speed limit signal S₅₃ S_drive , the fan 4 maintains a fixed speed according to the driving signal S_drive .

另外，该第二定速调制单元54更可依据该目标转速信号S_target、该温度速限信号S₅₄与一第二温度设定SET₂产生该第二速限信号S₅₃，其中该第二温度设定SET₂是指定该风扇4维持固定转速的温度范围。In addition, the second constantspeed modulation unit 54 can further generate the second speed limit signal S₅₃ according to the target speed signal S_target , the temperature speed limit signal S₅₄ and a second temperature setting SET₂ , wherein the second The temperature setting SET₂ specifies the temperature range within which the fan 4 maintains a fixed rotation speed.

如图6所示，在本实施例中，该转速调制模块5更包括一速限调整单元55，该速限调整单元55是调整该目标转速信号S_target以产生一第一目标信号S₅₅，一第二目标信号S₅₆与一第三目标信号S₅₇。As shown in FIG. 6 , in this embodiment, thespeed modulation module 5 further includes a speed limit adjustment unit 55 , the speed limit adjustment unit 55 adjusts the target speed signal S_target to generate a first target signal S₅₅ , A second target signal S₅₆ and a third target signal S₅₇ .

该第一定速调制单元52是依据该第一目标信号S₅₅产生该第一速限信号S₅₂，该温度调制单元51是依据该温度值S_temp与该第二目标信号S₅₆产生该温度转速信号S₅₁，该第二定速调制单元54是依据该第三目标信号S₅₇与该温度速限信号S₅₄产生该第二速限信号S₅₃。The first constantspeed modulation unit 52 generates the first speed limit signal S₅₂ according to the first target signal S₅₅ , and thetemperature modulation unit 51 generates the temperature according to the temperature value S_temp and the second target signal S₅₆ The speed signal S₅₁ , the second constantspeed modulation unit 54 generates the second speed limit signal S₅₃ according to the third target signal S₅₇ and the temperature speed limit signal S₅₄ .

如图4、图5与图7A所示，在本实施例中，当该风扇4所处的一环境温度大于一温度T₁且小于一温度T₂时，该温度调制单元51是依据该温度值S_temp产生该温度转速信号S₅₁，该综合控制单元53是依据该温度转速信号S₅₁与该第一速限信号S₅₂产生该风扇控制信号S_fan，该风扇驱动模块32是依据该风扇控制信号S_fan产生该驱动信号S_drive，该风扇4经由该驱动信号S_drive驱动之后，可依该环境温度的变化调整转速，或是依据该目标转速信号S_target调整相同该环境温度下的该风扇4的转速。在本实施例中，该目标转速信号S_target的电压值越小则该风扇4转速越高，也就是说，在固定该环境温度下，该目标转速信号S_target的电压若调增，则该风扇4的转速会降低。As shown in Figure 4, Figure 5 and Figure 7A, in this embodiment, when the ambient temperature of the fan 4 is greater than a temperature_T1 and less than a temperature_T2 , thetemperature modulation unit 51 is based on the temperature The value S_temp generates the temperature speed signal S₅₁ , theintegrated control unit 53 generates the fan control signal S_fan according to the temperature speed signal S₅₁ and the first speed limit signal S₅₂ , and thefan drive module 32 generates the fan control signal S fan according to the fan The control signal S_fan generates the drive signal S_drive , after the fan 4 is driven by the drive signal S_drive , the speed can be adjusted according to the change of the ambient temperature, or the speed of the fan 4 under the same ambient temperature can be adjusted according to the target speed signal S_target The speed of fan 4. In this embodiment, the smaller the voltage value of the target speed signal S_target is_, the higher the speed of the fan 4 is. The speed of fan 4 will decrease.

当该环境温度大于该温度T₂时，该第一定速调制单元52是依据该目标转速信号S_target与该第一温度设定SET₁产生该第一速限信号S₅₂，其中该第一温度设定SET₁是指定当该环境温度大于该温度T₁时该风扇4维持全速运转。该综合控制单元53是依据该第一速限信号S₅₂产生该风扇控制信号S_fan。该风扇驱动模块32是依据该风扇控制信号S_fan产生该驱动信号S_drive，该风扇4经由该驱动信号S_drive驱动之后，该风扇4以全速运转不再随温度增加而再增加转速，且可依据该目标转速信号S_target调整相同该环境温度下该风扇4全速运转的转速，也就是说，在固定该环境温度下，该目标转速信号S_target的电压若调增，则该风扇4的转速会降低。When the ambient temperature is greater than the temperature T₂ , the first constantspeed modulation unit 52 generates the first speed limit signal S₅₂ according to the target speed signal S_target and the first temperature setting SET₁ , wherein the first The temperature setting SET₁ specifies that the fan 4 maintains full-speed operation when the ambient temperature is greater than the temperature T₁ . Theintegrated control unit 53 generates the fan control signal S_fan according to the first speed limit signal S₅₂ . Thefan drive module 32 generates the drive signal S_drive according to the fan control signal S_fan . After the fan 4 is driven by the drive signal S_drive , the fan 4 runs at full speed and does not increase the speed with the increase of temperature, and can According to the target speed signal S_target to adjust the speed of the fan 4 running at full speed at the same ambient temperature, that is to say, at a fixed ambient temperature, if the voltage of the target speed signal S_target is increased, the speed of the fan 4 will increase. will decrease.

当该环境温度小于该温度T₁时，该第二定速调制单元54是依据该目标转速信号S_target、该温度速限信号S₅₄与该第二温度设定SET₂产生该第二速限信号S₅₃，使得该风扇4在该温度T₁附近时的转速不会突然增高或降低。其中该第二温度设定SET₂是指定当该环境温度小于该温度T₁时该风扇4维持低速运转。此时如果该第二速限信号S₅₃的电压电平小于该风扇控制信号S_fan的电压电平时，该风扇驱动模块32是依据该第二速限信号S₅₃产生该驱动信号S_drive，该风扇4会依据该驱动信号S_drive维持低速运转，该风扇4不再随温度降低而再降低转速，且可依据该目标转速信号S_target调整相同该环境温度下该风扇4全速运转的转速，也就是说，在固定该环境温度下，该目标转速信号S_target的电压若调增，则该风扇4的转速会降低。When the ambient temperature is lower than the temperature T₁ , the second constantspeed modulation unit 54 generates the second speed limit according to the target speed signal S_target , the temperature speed limit signal S₅₄ and the second temperature setting SET₂ The signal S₅₃ makes the speed of the fan 4 not suddenly increase or decrease when the temperature T₁ is near. Wherein the second temperature setting SET₂ specifies that the fan 4 maintains low speed operation when the ambient temperature is lower than the temperature T₁ . At this time, if the voltage level of the second speed limit signal_S53 is lower than the voltage level of the fan control signal S_fan , thefan drive module 32 generates the driving signal S_drive according to the second speed limit signal_S53 , the The fan 4 will maintain low-speed operation according to the driving signal S_drive , the fan 4 will no longer reduce the rotation speed as the temperature decreases, and the rotation speed of the fan 4 at full speed at the same ambient temperature can be adjusted according to the target rotation speed signal S_target . That is to say, when the ambient temperature is fixed, if the voltage of the target speed signal S_target is increased, the speed of the fan 4 will decrease.

在本实施例中，该转速调制模块5是可以是程序代码执行于一微控制器、一微处理器或一数字信号处理器等，以固件控制的方式控制该驱动模块32与该风扇4，其中该第一温度设定SET₁与该第二温度设定SET₂可以是程序代码中的参数或变量。另一方面，该转速调制模块5是直接由电子电路构成，以硬件控制的方式控制该驱动模块32与该风扇4，其中该第一温度设定SET₁与该第二温度设定SET₂可以是一电子电路中的一电容器、一电阻器、一电感器或一晶体管等电子组件的特性参数。In this embodiment, the rotationalspeed modulation module 5 can be a program code executed on a microcontroller, a microprocessor or a digital signal processor, etc., and controls thedrive module 32 and the fan 4 in a firmware-controlled manner, Wherein the first temperature setting SET₁ and the second temperature setting SET₂ may be parameters or variables in the program code. On the other hand, the rotationspeed modulation module 5 is directly composed of electronic circuits, and controls thedrive module 32 and the fan 4 in a hardware-controlled manner, wherein the first temperature setting SET₁ and the second temperature setting SET₂ can be It is a characteristic parameter of an electronic component such as a capacitor, a resistor, an inductor or a transistor in an electronic circuit.

如图4、图5、图7B至图7F所示，在本实施例中，调整该第一温度设定SET₁与该第二温度设定SET₂可以改变该转速调制模块5的控制特性，使得该风扇4的转速不仅在各温度时能够连续变化，且该风扇4的转速与该环境温度的关系能够有更多样的变化。As shown in FIG. 4, FIG. 5, and FIG. 7B to FIG. 7F, in this embodiment, adjusting the first temperature setting SET₁ and the second temperature setting SET₂ can change the control characteristics of the rotationalspeed modulation module 5, Therefore, not only the rotation speed of the fan 4 can be changed continuously at various temperatures, but also the relationship between the rotation speed of the fan 4 and the ambient temperature can have more varied changes.

如图4、图6与图7G所示，在本实施例中，除了该第一温度设定SET₁与该第二温度设定SET₂可以改变该转速调制模块5的控制特性，该速限调整单元55亦可产生不同的该第一目标信号S₅₅、该第二目标信号S₅₆与该第三目标信号S₅₇，使得该第一速限信号S₅₂、该温度转速信号S₅₁与该第二速限信号S₅₃能够分别依据该第一目标信号S₅₅、该第二目标信号S₅₆与该第三目标信号S₅₇而产生，进而使得该风扇4的转速在该温度T₁与该温度T₂时不连续变化，更使得该风扇4的转速与该环境温度的关系能够有更多样的变化。As shown in Figure 4, Figure 6 and Figure 7G, in this embodiment, in addition to the first temperature setting SET₁ and the second temperature setting SET₂ can change the control characteristics of the rotationalspeed modulation module 5, the speed limit The adjustment unit 55 can also generate the first target signal S₅₅ , the second target signal S₅₆ and the third target signal S₅₇ , so that the first speed limit signal S₅₂ , the temperature speed signal S₅₁ and the The second speed limit signal S₅₃ can be generated according to the first target signal S₅₅ , the second target signal S₅₆ and the third target signal S₅₇ respectively, so that the speed of the fan 4 is between the temperature T₁ and the The temperature_T2 changes discontinuously, so that the relationship between the rotation speed of the fan 4 and the ambient temperature can have more varied changes.

如图8所示，在本实施例中，该转速调制模块5是直接由一电子电路构成，该目标转速信号S_target是输入该转速调制模块5后可经一电阻器R₁接地，或分别输入至该温度调制单元51、该第二定速调制单元54与该第一定速调制单元52。As shown in Figure 8, in this embodiment, the rotationalspeed modulation module 5 is directly composed of an electronic circuit, and the target rotational speed signal S_target can be grounded through a resistor_R1 after being input into the rotationalspeed modulation module 5, or respectively Input to thetemperature modulation unit 51 , the second constantspeed modulation unit 54 and the first constantspeed modulation unit 52 .

该温度调制单元51是包括多个电阻器R₂-R₄、一二极管D₁、一电容器C₁与一晶体管TR₁。该目标转速信号S_target是输入至该晶体管TR₁的基极，一外接电源V是输入至该等电阻器R₂-R₄，该电阻器R₂是电连接于该晶体管TR₁的基极，该电阻器R₃与该二极管D₁是电连接于该晶体管TR₁的源极。Thetemperature modulation unit 51 includes a plurality of resistors R₂ -R₄ , a diode D₁ , a capacitor C₁ and a transistor TR₁ . The target speed signal S_target is input to the base of the transistor TR₁ , an external power supply V is input to the resistors R₂ -R₄ , and the resistor R₂ is electrically connected to the base of the transistor TR₁ , the resistor_R3 and the diode_D1 are electrically connected to the source of the transistor_TR1 .

该温度测量模块31是可以是一热敏电阻器R_t，该温度值S_temp是由该热敏电阻器R_t所产生，该热敏电阻器R_t是与该二极管D₁、该电容器C₁与该电阻器R₄电连接以产生该温度转速信号S₅₁。Thetemperature measuring module 31 can be a thermistor R_t , the temperature value S_temp is generated by the thermistor R_t , and the thermistor R_t is connected with the diode D₁ and the capacitor C₁ is electrically connected with the resistor R₄ to generate the temperature speed signal S₅₁ .

该第二定速调制单元54是包括多个电阻器R₅^-R₁₁多个二极管D₃-D₆、一电容器C₂与一晶体管TR₂。目标转速信号S_target是输入至该晶体管TR₂的基极，该外接电源V是输入至该等电阻器R₅-R₆，该二极管D₃是与该温度调制单元51电连接以接收该温度速限信号S₅₄，该电阻器R₅、该二极管D₃与该二极管D₄是电连接于该晶体管TR₂的源极。该电阻器R₇与该电容器C₂是并联且电连接该电阻器R₆、该电阻器R₈与该二极管D₁，此部分电路是用以控制该风扇4在该温度T₁时转速不会突然增加或突然降低。The second constantspeed modulation unit 54 includes a plurality of resistors R₅^-R₁₁ , a plurality of diodes D₃ -D₆ , a capacitor C₂ and a transistor TR₂ . The target speed signal S_target is input to the base of the transistor TR₂ , the external power supply V is input to the resistors R₅ -R₆ , the diode D₃ is electrically connected to thetemperature modulation unit 51 to receive the temperature The speed limit signal S₅₄ , the resistor R₅ , the diode D₃ and the diode D₄ are electrically connected to the source of the transistor TR₂ . The resistor R₇ and the capacitor C₂ are connected in parallel and are electrically connected to the resistor R₆ , the resistor R₈ and the diode D₁ . This part of the circuit is used to control the speed of the fan 4 at the temperature T₁ . sudden increase or sudden decrease.

该电阻器R₈是与该二极管D₅、该二极管D₆以及该电阻器R₁₁电连接，该外接电源V是输入至该电阻器R₉，该电阻器R₉是与该二极管D₅以及该电阻器R₁₀电连接以产生该第二速限信号S₅₃。The resistor R₈ is electrically connected to the diode D₅ , the diode D₆ and the resistor R₁₁ , the external power supply V is input to the resistor R₉ , and the resistor R₉ is connected to the diode D₅ and theresistor R 11 . The resistor R₁₀ is electrically connected to generate the second speed limit signal S₅₃ .

该第一定速调制单元52是包括多个电阻器R₁₂^-R₁₄、一二极管D₇、一电容器C₃与一晶体管TR₃。该目标转速信号S_target是输入至该晶体管TR₃的基极，该外接电源V是输入至该电阻器R₁₂与该电阻器R₁₃该电阻器R₁₂是电连接于该晶体管TR₃的源极，该电阻器R₁₃与该二极管D₇是电连接于该晶体管TR₃的源极。该电阻器R₁₄与该电容器C₃是并联且电连接该电阻器R₁₃与该二极管D₇以产生该第一速限信号S₅₂。The first constantspeed modulation unit 52 includes a plurality of resistors R₁₂^- R₁₄ , a diode D₇ , a capacitor C₃ and a transistor TR₃ . The target speed signal S_target is input to the base of the transistor TR₃ , the external power supply V is input to the resistor R₁₂ and the resistor R_13. The resistor R₁₂ is electrically connected to the source of the transistor TR₃ pole, the resistor R₁₃ and the diode D₇ are electrically connected to the source of the transistor TR₃ . The resistor R₁₄ is connected in parallel with the capacitor C₃ and is electrically connected with the resistor R₁₃ and the diode D₇ to generate the first speed limit signal S₅₂ .

该综合控制单元53是包括一二极管D₂与一二极管D₈。该第一速限信号S₅₂是输入至该二极管D₈，该温度转速信号S₅₁是输入至该二极管D₂，该二极管D₂与该二极管D₈是电连接以产生该风扇控制信号S_fan。Theintegrated control unit 53 includes a diode D₂ and a diode D₈ . The first speed limit signal S₅₂ is input to the diode D₈ , the temperature speed signal S₅₁ is input to the diode D₂ , and the diode D₂ and the diode D₈ are electrically connected to generate the fan control signal S_fan .

如图9所示，依本发明的风扇控制方法是接收一目标转速信号以控制一风扇的转速，本方法包括步骤Step1-Step3。As shown in FIG. 9 , the fan control method according to the present invention is to receive a target speed signal to control the speed of a fan, and the method includes Step1-Step3.

在步骤Step1，测量风扇所处环境的温度以产生一温度值。InStep 1 , the temperature of the environment where the fan is located is measured to generate a temperature value.

在步骤Step2，依据该温度值与该目标转速信号以产生一风扇控制信号。InStep 2 , a fan control signal is generated according to the temperature value and the target speed signal.

在步骤Step3，依据该风扇控制信号产生一驱动信号以驱动该风扇动作。Instep 3, a drive signal is generated according to the fan control signal to drive the fan to operate.

如图10所示，在本实施例中，步骤Step2是包括步骤Step21-Step23。As shown in FIG. 10, in this embodiment, step Step2 includes steps Step21-Step23.

在步骤Step21，依据该温度值与该目标转速信号产生一温度转速信号。In Step 21 , a temperature rotation speed signal is generated according to the temperature value and the target rotation speed signal.

在步骤Step22，依据该目标转速信号产生一第一速限信号，在本步骤中，更可依据该目标转速信号与一第一温度设定产生第一速限信号，其中第一温度设定是指定该风扇维持固定转速的温度范围。In step Step22, a first speed limit signal is generated according to the target speed signal. In this step, a first speed limit signal can be generated according to the target speed signal and a first temperature setting, wherein the first temperature setting is Specifies the temperature range over which this fan maintains a constant speed.

在步骤Step23，依据该温度转速信号与该第一速限信号至少二者其中之一以产生该风扇控制信号。In Step23, the fan control signal is generated according to at least one of the temperature rotation speed signal and the first speed limit signal.

如图11所示，与图9所示不同的是，本实施例的风扇控制方法更包括步骤Step4、步骤Step5与步骤Step6。As shown in FIG. 11 , different from that shown in FIG. 9 , the fan control method of this embodiment further includes Step 4 ,Step 5 and Step 6 .

在步骤Step4，依据该温度值产生一温度速限信号。In Step4, a temperature speed limit signal is generated according to the temperature value.

在步骤Step5，依据该目标转速信号与该温度速限信号产生一第二速限信号。在此步骤中，更可依据该目标转速信号、该温度速限信号与一第二温度设定产生该第二速限信号，其中该第二温度设定是指定该风扇维持固定转速的温度范围。In Step5, a second speed limit signal is generated according to the target speed signal and the temperature speed limit signal. In this step, the second speed limit signal can be generated according to the target speed signal, the temperature speed limit signal and a second temperature setting, wherein the second temperature setting is a temperature range within which the fan maintains a fixed speed. .

在步骤Step6，依据该第二速限信号产生该驱动信号，该风扇是依据该驱动信号维持固定转速。In Step 6 , the drive signal is generated according to the second speed limit signal, and the fan maintains a constant speed according to the drive signal.

另外，在另一实施例中，可以依据该目标转速信号以产生一第一目标信号、一第二目标信号与一第三目标信号，步骤Step22是可依据该第一目标信号产生该第一速限信号，步骤Step21是可依据该温度值与该第二目标信号产生该温度转速信号，步骤Step4是可依据该第三目标信号与该温度速限信号产生该第二速限信号。In addition, in another embodiment, a first target signal, a second target signal, and a third target signal can be generated according to the target speed signal. In Step 22, the first speed can be generated according to the first target signal. In step 21, the temperature speed limit signal can be generated according to the temperature value and the second target signal, and in step 4, the second speed limit signal can be generated according to the third target signal and the temperature speed limit signal.

本实施例的该风扇控制方法是可应用于前述图4至图8的实施例中的该风扇控制装置，所以本实施例的该风扇控制方法已在前述该风扇控制装置的实施例中讨论过，故此不再赘述。The fan control method of this embodiment can be applied to the fan control device in the aforementioned embodiments of FIG. 4 to FIG. 8 , so the fan control method of this embodiment has been discussed in the aforementioned embodiment of the fan control device , so it will not be repeated here.

综上所述，因依本发明的风扇控制装置是具有转速调制模块，转速调制模块是依据温度值与目标转速信号控制风扇的转速，故能够除依据温度值自动调节风扇转速，更能够依据目标转速信号而自动调节风扇转速，使得风扇转速与温度的特性曲线能够更进一步变化，风扇得以更依据使用者的环境而适当适切地调整风扇转速，以满足使用者的需求。To sum up, the fan control device according to the present invention has a rotation speed modulation module, and the rotation speed modulation module controls the rotation speed of the fan according to the temperature value and the target rotation speed signal. The speed signal automatically adjusts the fan speed, so that the characteristic curve of the fan speed and temperature can be further changed, and the fan can adjust the fan speed more appropriately according to the user's environment to meet the user's needs.

以上所述仅为举例性，而非为限制性者。任何未脱离本发明的精神与范畴，而对其进行的等效修改或变更，均应包括在后附的申请专利范围中。The above descriptions are illustrative only, not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the scope of the appended patent application.

Claims (16)

Translated fromChinese

1、一种风扇控制装置，其是接收一目标转速信号以控制一风扇的转速，包括：1. A fan control device, which receives a target speed signal to control the speed of a fan, comprising:一温度测量模块，其是测量该风扇所处环境的温度以产生一温度值；A temperature measurement module, which measures the temperature of the environment where the fan is located to generate a temperature value;一转速调制模块，其是与该温度测量模块电连接并接收该温度值，且依据该温度值与该目标转速信号以产生一风扇控制信号；以及a rotational speed modulation module, which is electrically connected to the temperature measurement module and receives the temperature value, and generates a fan control signal according to the temperature value and the target rotational speed signal; and一风扇驱动模块，其是与该转速调制模块电连接，并依据该风扇控制信号产生一驱动信号以驱动该风扇动作。A fan driving module is electrically connected with the rotational speed modulation module, and generates a driving signal according to the fan control signal to drive the fan to act.2、如权利要求1所述的风扇控制装置，其中，该目标转速信号及该驱动信号皆为一脉冲宽度调制信号。2. The fan control device as claimed in claim 1, wherein both the target speed signal and the driving signal are pulse width modulated signals.3、如权利要求1所述的风扇控制装置，其中，该转速调制模块包括：3. The fan control device according to claim 1, wherein the rotational speed modulation module comprises:一温度调制单元，其是接收该温度值并依据该温度值与该目标转速信号以产生一温度转速信号；A temperature modulating unit, which receives the temperature value and generates a temperature speed signal according to the temperature value and the target speed signal;一第一定速调制单元，其是依据该目标转速信号与一第一温度设定产生一第一速限信号，其中，该温度设定是指定该风扇维持固定转速的温度范围；A first constant speed modulation unit, which generates a first speed limit signal according to the target speed signal and a first temperature setting, wherein the temperature setting specifies the temperature range within which the fan maintains a fixed speed;一综合控制单元，其是依据该温度转速信号与该第一速限信号至少二者其中之一以产生该风扇控制信号；An integrated control unit, which generates the fan control signal according to at least one of the temperature rotation speed signal and the first speed limit signal;一第二定速调制单元，其是依据该目标转速信号、该温度速限信号与一第二温度设定产生一第二速限信号，其中，该温度速限信号是由该温度调制单元依据该温度值所产生，而该温度设定是指定该风扇维持固定转速的温度范围；以及A second constant speed modulation unit, which generates a second speed limit signal according to the target speed signal, the temperature speed limit signal and a second temperature setting, wherein the temperature speed limit signal is based on the temperature modulation unit generated by the temperature value, and the temperature setting specifies the temperature range within which the fan maintains a constant speed; and一速限调整单元，其是调整该目标转速信号以产生一第一目标信号，一第二目标信号与一第三目标信号，其中，该第一定速调制单元是依据该第一目标信号产生该第一速限信号，该温度调制单元是依据该温度值与该第二目标信号产生该温度转速信号，该第二定速调制单元是依据该第三目标信号与该温度速限信号产生该第二速限信号。A speed limit adjustment unit, which adjusts the target speed signal to generate a first target signal, a second target signal and a third target signal, wherein the first constant speed modulation unit is generated according to the first target signal For the first speed limit signal, the temperature modulation unit generates the temperature speed signal according to the temperature value and the second target signal, and the second constant speed modulation unit generates the temperature speed limit signal according to the third target signal and the temperature speed limit signal Second speed limit signal.4、如权利要求3所述的风扇控制装置，其中，该风扇驱动模块更依据该第二速限信号产生该驱动信号，该风扇是依据该驱动信号维持固定转速。4. The fan control device as claimed in claim 3, wherein the fan driving module further generates the driving signal according to the second speed limit signal, and the fan maintains a constant speed according to the driving signal.5、如权利要求3所述的风扇控制装置，其中，该第二定速调制单元包括：5. The fan control device according to claim 3, wherein the second constant speed modulation unit comprises:一第一电阻器；a first resistor;一晶体管，其基极是接收该目标转速信号；A transistor, the base of which receives the target speed signal;一第二电阻器，其一端是电连接于该第一电阻器的一端，另一端是电连接于该晶体管的源极；a second resistor, one end of which is electrically connected to one end of the first resistor, and the other end is electrically connected to the source of the transistor;一第一二极管，其一端是电连接于该晶体管的源极，另一端是电连接于该温度调制单元以接收该温度速限信号；A first diode, one end of which is electrically connected to the source of the transistor, and the other end is electrically connected to the temperature modulation unit to receive the temperature speed limit signal;一第二二极管，其一端是电连接于该晶体管的源极，另一端是电连接于该第一电阻器的另一端；a second diode, one end of which is electrically connected to the source of the transistor, and the other end is electrically connected to the other end of the first resistor;一第三电阻器，其一端是电连接于该第一电阻器的另一端；a third resistor, one end of which is electrically connected to the other end of the first resistor;一电容器，其一端是电连接于该第一电阻器的另一端与该第三电阻器并联；a capacitor, one end of which is electrically connected to the first resistor and the other end is connected in parallel with the third resistor;一第四电阻器，其一端是与该第一电阻器与该电容器电连接，另一端是与该风扇驱动模块电连接以产生该第二速限信号；一第三二极管，其一端是电连接于该第四电阻器；A fourth resistor, one end of which is electrically connected to the first resistor and the capacitor, and the other end is electrically connected to the fan drive module to generate the second speed limit signal; a third diode, one end of which is electrically connected to the fourth resistor;一第五电阻器，其是电连接于该第三二极管的另一端；以及a fifth resistor electrically connected to the other end of the third diode; and一第四二极管，其一端是电连接于该第四电阻器，另一端是接地。A fourth diode, one end of which is electrically connected to the fourth resistor, and the other end is grounded.6、如权利要求3所述的风扇控制装置，其中，该温度调制单元包括：6. The fan control device according to claim 3, wherein the temperature modulation unit comprises:一第一电阻器；a first resistor;一晶体管，其基极是接收该目标转速信号；A transistor, the base of which receives the target speed signal;一第二电阻器，其一端是电连接于该第一电阻器的一端，另一端是电连接于该晶体管的基极；a second resistor, one end of which is electrically connected to one end of the first resistor, and the other end is electrically connected to the base of the transistor;一第三电阻器，其一端是电连接于该第一电阻器的一端，另一端是电连接于该晶体管的源极；a third resistor, one end of which is electrically connected to one end of the first resistor, and the other end is electrically connected to the source of the transistor;一二极管，其一端是电连接于该晶体管的源极，另一端是电连接于该第一电阻器的另一端；以及a diode, one end of which is electrically connected to the source of the transistor and the other end is electrically connected to the other end of the first resistor; and一电容器，其是电连接于该第一电阻器的另一端并接收该温度值以产生该温度转速信号。A capacitor is electrically connected to the other end of the first resistor and receives the temperature value to generate the temperature rotation speed signal.7、如权利要求3所述的风扇控制装置，其中，该第一定速调制单元包括：7. The fan control device according to claim 3, wherein the first constant speed modulation unit comprises:一第一电阻器；a first resistor;一晶体管，其基极是接收该目标转速信号；A transistor, the base of which receives the target speed signal;一第二电阻器，其一端是电连接于该第一电阻器的一端，另一端是电连接于该晶体管的源极；a second resistor, one end of which is electrically connected to one end of the first resistor, and the other end is electrically connected to the source of the transistor;一二极管，其一端是电连接于该晶体管的源极，另一端是电连接于该第一电阻器的另一端；a diode, one end of which is electrically connected to the source of the transistor, and the other end is electrically connected to the other end of the first resistor;一第三电阻器，其一端是电连接于该第一电阻器的另一端；以及a third resistor, one end of which is electrically connected to the other end of the first resistor; and一电容器，其一端是电连接该第一电阻器的另一端与该第三电阻器并联以产生该第一速限信号。A capacitor, one end of which is electrically connected to the first resistor and the other end is connected in parallel with the third resistor to generate the first speed limit signal.8、如权利要求3所述的风扇控制装置，其中，该综合控制单元包括：8. The fan control device according to claim 3, wherein the integrated control unit comprises:一第一二极管，其一端是与该温度调制单元电连接以接收该温度转速信号；以及a first diode, one end of which is electrically connected to the temperature modulation unit to receive the temperature rotation speed signal; and一第二二极管，其一端是与该第一定速调制单元电连接以接收该第一速限信号，另一端是与该第一二极管的另一端电连接以产生该风扇控制信号。A second diode, one end of which is electrically connected to the first constant speed modulation unit to receive the first speed limit signal, and the other end is electrically connected to the other end of the first diode to generate the fan control signal .9、如权利要求1所述的风扇控制装置，其中，该转速调制模块是为执行于一微处理器、一微控制器或一数字信号处理器的一程序代码。9. The fan control device as claimed in claim 1, wherein the rotational speed modulation module is a program code executed on a microprocessor, a microcontroller or a digital signal processor.10、一种风扇控制方法，其是接收一目标转速信号以控制一风扇的转速，其步骤包括：10. A fan control method, which is to receive a target speed signal to control the speed of a fan, the steps comprising:测量该风扇所处环境的温度以产生一温度值；measuring the temperature of the environment where the fan is located to generate a temperature value;依据该温度值与该目标转速信号以产生一风扇控制信号；以及generating a fan control signal according to the temperature value and the target speed signal; and依据该风扇控制信号产生一驱动信号以驱动该风扇动作。A drive signal is generated according to the fan control signal to drive the fan to act.11、如权利要求10所述的风扇控制方法，其中，该目标转速信号及该驱动信号皆为一脉冲宽度调制信号。11. The fan control method as claimed in claim 10, wherein both the target speed signal and the driving signal are pulse width modulation signals.12、如权利要求10所述的风扇控制方法，其中依据该温度值与该目标转速信号以产生该风扇控制信号的步骤更包括：12. The fan control method as claimed in claim 10, wherein the step of generating the fan control signal according to the temperature value and the target speed signal further comprises:依据该温度值与该目标转速信号产生一温度转速信号；generating a temperature speed signal according to the temperature value and the target speed signal;依据该目标转速信号产生一第一速限信号；以及generating a first speed limit signal according to the target speed signal; and依据该温度转速信号与该第一速限信号至少二者其中之一以产生该风扇控制信号。The fan control signal is generated according to at least one of the temperature rotation speed signal and the first speed limit signal.13、如权利要求12所述的风扇控制方法，其中，依据该目标转速信号产生该第一速限信号的步骤包括：13. The fan control method according to claim 12, wherein the step of generating the first speed limit signal according to the target speed signal comprises:依据该目标转速信号与一第一温度设定产生该第一速限信号，其中，该第一温度设定是指定该风扇维持固定转速的温度范围。The first speed limit signal is generated according to the target speed signal and a first temperature setting, wherein the first temperature setting specifies a temperature range within which the fan maintains a constant speed.14、如权利要求12所述的风扇控制方法，其步骤更包括：14. The fan control method as claimed in claim 12, further comprising:依据该温度值产生一温度速限信号；以及generating a temperature speed limit signal according to the temperature value; and依据该目标转速信号与该温度速限信号产生一第二速限信号，且依据该第二速限信号产生该驱动信号，该风扇是依据该驱动信号维持固定转速。A second speed limit signal is generated according to the target speed signal and the temperature speed limit signal, and the drive signal is generated according to the second speed limit signal, and the fan maintains a fixed speed according to the drive signal.15、如权利要求14所述的风扇控制方法，其步骤更包括：15. The fan control method as claimed in claim 14, further comprising:依据该目标转速信号、该温度速限信号与一第二温度设定产生该第二速限信号，其中，该第二温度设定是指定该风扇维持固定转速的温度范围。The second speed limit signal is generated according to the target speed signal, the temperature speed limit signal and a second temperature setting, wherein the second temperature setting specifies a temperature range within which the fan maintains a constant speed.16、如权利要求14所述的风扇控制方法，其中，依据该温度值与该目标转速信号以产生一风扇控制信号的步骤更包括：16. The fan control method as claimed in claim 14, wherein the step of generating a fan control signal according to the temperature value and the target speed signal further comprises:调整该目标转速信号以产生一第一目标信号，一第二目标信号与一第三目标信号；adjusting the target speed signal to generate a first target signal, a second target signal and a third target signal;依据该第一目标信号产生该第一速限信号；generating the first speed limit signal according to the first target signal;依据该温度值与该第二目标信号产生该温度转速信号；以及generating the temperature rotational speed signal according to the temperature value and the second target signal; and依据该第三目标信号与该温度速限信号产生该第二速限信号。The second speed limit signal is generated according to the third target signal and the temperature speed limit signal.

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