技术领域technical field
本发明涉及一种加热辊控制装置，尤其涉及一种用于控制加热辊的加热的控制装置。The invention relates to a heating roller control device, in particular to a control device for controlling the heating of the heating roller.
背景技术Background technique
对于打印机以及复印机等图像形成设备，其中的定影单元在利用热处理将色粉图像定影在纸张等记录介质上的过程中，需要对定影单元中的加热辊的温度进行控制，以免加热辊过热，对定影单元造成损伤，导致整个图像形成设备受到损伤，例如，使图像形成设备受热变形、冒烟、甚至烧毁等等。For image forming equipment such as printers and copiers, the temperature of the heating roller in the fixing unit needs to be controlled during the process of using heat treatment to fix the toner image on the recording medium such as paper in the fixing unit, so as to avoid overheating of the heating roller. The fixing unit causes damage, causing damage to the entire image forming device, for example, causing the image forming device to be deformed by heat, smoke, or even burnt.
在现有技术中，由CPU等对温度进行监视，并根据温度传感器检测到的加热辊的温度对加热辊进行相应的温度调整控制。如果在控制过程中，发现检测到的温度异常升高，则切断电源单元对加热辊的加热供电。In the prior art, the temperature is monitored by a CPU, etc., and the temperature of the heating roller is adjusted and controlled accordingly according to the temperature of the heating roller detected by the temperature sensor. If during the control process, it is found that the detected temperature rises abnormally, then cut off the heating power supplied by the power supply unit to the heating roller.
另外，考虑到CPU等软件异常的情况，除了通过CPU等的软件控制之外，作为安全措施，还可通过硬件电路来强行切断对加热辊的控制。这样的硬件电路通常由比较器(即，比较单元)和锁存器(即，保持单元)构成。比较器对来自温度传感器的电压U和预定的异常基准电压U1进行比较，其中，温度传感器的电压U对应于温度传感器检测到的加热辊的温度T，异常基准电压U1对应于阈值T1，当温度T上升时，电压U下降。如果电压U小于等于预定的异常基准电压U1(即，加热辊的温度T大于等于预定的阈值T1)，那么比较器就会输出异常信号。In addition, in consideration of software abnormalities such as the CPU, in addition to the software control of the CPU, as a safety measure, the control of the heating roller can also be forcibly cut off through the hardware circuit. Such a hardware circuit is generally composed of a comparator (ie, a comparison unit) and a latch (ie, a holding unit). The comparator compares the voltage U from the temperature sensor with a predetermined abnormal reference voltage U1, wherein the voltage U of the temperature sensor corresponds to the temperature T of the heating roller detected by the temperature sensor, and the abnormal reference voltage U1 corresponds to the threshold value T1, when the temperature When T rises, the voltage U falls. If the voltage U is less than or equal to a predetermined abnormal reference voltage U1 (ie, the temperature T of the heating roller is greater than or equal to a predetermined threshold T1), the comparator will output an abnormal signal.
锁存器由D触发器构成，D触发器的输入端(D端)接收比较器输出的异常信号，并在D触发器的时钟端(CLK端)接收到作为采样信号的上升沿信号时，其输出端(Q端)输出该异常信号，并对该异常信号进行锁存(保持)，从而通过后续的电源控制单元切断电源单元对加热辊的供电，以停止对加热辊的加热。The latch is composed of a D flip-flop. The input terminal (D terminal) of the D flip-flop receives the abnormal signal output by the comparator, and when the clock terminal (CLK terminal) of the D flip-flop receives the rising edge signal as the sampling signal, Its output terminal (Q terminal) outputs the abnormal signal, and latches (holds) the abnormal signal, thereby cutting off the power supply of the power supply unit to the heating roller through the subsequent power supply control unit, so as to stop heating the heating roller.
现有技术中，采样信号(过零信号)是由电源单元所产生的，为此，在电源单元中就必须设置相应的元器件，例如，光耦、三极管、整流器以及电阻和电容等等，设置这些元器件无疑会导致电源单元的结构复杂，并且制造成本增加，从而导致整个图像形成设备的制造成本增加。In the prior art, the sampling signal (zero-crossing signal) is generated by the power supply unit. For this reason, corresponding components must be set in the power supply unit, such as optocouplers, triodes, rectifiers, resistors and capacitors, etc., Arrangement of these components undoubtedly leads to a complicated structure of the power supply unit and an increase in manufacturing cost, thereby resulting in an increase in the manufacturing cost of the entire image forming apparatus.
发明内容Contents of the invention
鉴于上述提出的问题，本发明旨在提供一种能够降低整个图像形成设备的制造成本的加热辊控制装置。In view of the problems posed above, the present invention aims to provide a heat roller control device capable of reducing the manufacturing cost of the entire image forming apparatus.
根据本发明的一个方面，提供一种加热辊控制装置，用于控制电源单元对定影单元的加热辊的加热，该定影单元包括检测该加热辊的温度值的温度传感器，该加热辊控制装置包括：异常判断单元，其接收该温度传感器检测到的该温度值，当该温度值大于等于预定的阈值T1时，输出异常信号；独立于该电源单元外的采样信号产生单元，用于产生采样信号；保持单元，接收从该异常判断单元输出的该异常信号，并在接收到该采样信号时，输出该异常信号并进行保持；电源控制单元，在接收到该保持单元发出的该异常信号时，切断该电源单元对该加热辊的供电，以停止对该加热辊的加热。According to an aspect of the present invention, there is provided a heating roller control device for controlling heating of a heating roller of a fixing unit by a power supply unit, the fixing unit includes a temperature sensor for detecting a temperature value of the heating roller, the heating roller control device includes : Abnormal judging unit, which receives the temperature value detected by the temperature sensor, and outputs an abnormal signal when the temperature value is greater than or equal to a predetermined threshold T1; a sampling signal generating unit independent of the power supply unit for generating sampling signals The holding unit receives the abnormal signal output from the abnormal judgment unit, and when receiving the sampling signal, outputs the abnormal signal and holds it; the power control unit receives the abnormal signal sent by the holding unit, The power supply of the power supply unit to the heating roller is cut off to stop the heating of the heating roller.
该保持单元包括至少一个D触发器，该D触发器的输入端接收从该异常判断单元输出的该异常信号，并且在该D触发器的时钟端接收到该采样信号时，该D触发器的输出端输出该异常信号并进行保持。The holding unit includes at least one D flip-flop, the input terminal of the D flip-flop receives the abnormal signal output from the abnormal judgment unit, and when the clock terminal of the D flip-flop receives the sampling signal, the D flip-flop The output terminal outputs the abnormal signal and holds it.
该电源控制单元包括至少一个与门，该与门的一个输入端与该D触发器的该输出端相连，该与门的输出端与该电源单元相连。The power control unit includes at least one AND gate, an input terminal of the AND gate is connected with the output terminal of the D flip-flop, and an output terminal of the AND gate is connected with the power supply unit.
该采样信号产生单元接收该温度传感器检测到的该温度值，当该温度值大于等于预定的采样阈值T2时，产生该采样信号，其中，该阈值T1小于该采样阈值T2，且该采样阈值T2不会对该定影单元造成损伤。The sampling signal generating unit receives the temperature value detected by the temperature sensor, and generates the sampling signal when the temperature value is greater than or equal to a predetermined sampling threshold T2, wherein the threshold T1 is smaller than the sampling threshold T2, and the sampling threshold T2 There will be no damage to the fixing unit.
该采样信号产生单元包括：比较单元，该比较单元将该温度值与该采样阈值T2进行比较，并且当该温度值大于等于该采样阈值T2时，产生该采样信号。The sampling signal generation unit includes: a comparison unit, which compares the temperature value with the sampling threshold T2, and generates the sampling signal when the temperature value is greater than or equal to the sampling threshold T2.
该采样信号产生单元是不控制该电源单元的CPU。The sampling signal generating unit is a CPU that does not control the power supply unit.
该采样信号产生单元包括：振荡器，该振荡器产生正弦波信号；触发器，该触发器对该正弦波信号进行整形，从而产生该采样信号。The sampling signal generating unit includes: an oscillator, which generates a sine wave signal; a trigger, which shapes the sine wave signal, thereby generating the sampling signal.
该采样信号方波信号。The sampling signal is a square wave signal.
本发明还提供一种图像形成设备，包括如上所述的加热辊控制装置。The present invention also provides an image forming apparatus including the heating roller control device as described above.
本发明中，无需在电源单元中设置产生采样信号的元器件，而是利用本发明中的采样信号产生单元来产生采样信号，如此，可以使得电源单元的结构简单，制造成本降低，从而使得整个图像形成设备的制造成本降低。In the present invention, there is no need to set components and parts for generating sampling signals in the power supply unit, but to use the sampling signal generating unit in the present invention to generate sampling signals. In this way, the structure of the power supply unit can be simplified, and the manufacturing cost can be reduced, thereby making the whole The manufacturing cost of the image forming apparatus is reduced.
附图说明Description of drawings
图1是根据本发明的实施例的加热辊控制装置的结构框图；FIG. 1 is a structural block diagram of a heating roller control device according to an embodiment of the present invention;
图2是根据本发明的第一实施例的加热辊控制装置的电路图；2 is a circuit diagram of a heating roller control device according to a first embodiment of the present invention;
图3是根据本发明的第一实施例的加热辊控制装置中的相关信号随时间变化的状态图；FIG. 3 is a state diagram showing changes of related signals over time in the heating roller control device according to the first embodiment of the present invention;
图4是根据本发明的第二实施例的加热辊控制装置的电路图；4 is a circuit diagram of a heating roller control device according to a second embodiment of the present invention;
图5根据本发明的第二和第三实施例的加热辊控制装置中的相关信号随时间变化的状态图；FIG. 5 is a state diagram showing changes of related signals over time in the heating roller control device according to the second and third embodiments of the present invention;
图6是根据本发明的第三实施例的加热辊控制装置的电路图。Fig. 6 is a circuit diagram of a heat roller control device according to a third embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明的实施例进行详细说明。Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
本发明的加热辊控制装置用于图像形成设备中。在控制电源单元12的CPU(图未视)出现异常时，通过本发明的加热辊控制装置来切断电源单元对加热辊的加热供电。The heat roller control device of the present invention is used in an image forming apparatus. When the CPU (not shown in the figure) controlling the power supply unit 12 is abnormal, the heating power supplied by the power supply unit to the heating roller is cut off by the heating roller control device of the present invention.
如附图1所示，本发明的加热辊控制装置11用于控制电源单元12对定影单元10的加热辊102的加热，定影单元10包括检测加热辊102的温度值T的温度传感器101，该加热辊控制装置11包括：异常判断单元111，其接收温度传感器101检测到的温度值T，当温度值T大于等于预定的阈值T1时，输出异常信号L；独立于电源单元12外的采样信号产生单元114，用于产生采样信号；保持单元112，接收从异常判断单元111输出的异常信号L，并在接收到采样信号时，输出异常信号L并进行保持；电源控制单元113，在接收到保持单元112发出的异常信号L时，切断电源单元12对加热辊102的供电，以停止对加热辊102的加热。As shown in Figure 1, the heating roller control device 11 of the present invention is used to control the heating of the heating roller 102 of the fixing unit 10 by the power supply unit 12. The fixing unit 10 includes a temperature sensor 101 for detecting the temperature value T of the heating roller 102. The heating roller control device 11 includes: an abnormality judging unit 111, which receives the temperature value T detected by the temperature sensor 101, and outputs an abnormality signal L when the temperature value T is greater than or equal to a predetermined threshold T1; it is independent of the sampling signal outside the power supply unit 12 The generating unit 114 is used to generate the sampling signal; the holding unit 112 receives the abnormal signal L output from the abnormal judging unit 111, and when receiving the sampling signal, outputs the abnormal signal L and holds it; the power control unit 113 receives the abnormal signal L When the abnormal signal L sent by the unit 112 is kept, the power supply of the heating roller 102 by the power supply unit 12 is cut off, so as to stop heating the heating roller 102 .
参见图2，图示根据本发明第一实施例的加热辊控制装置11的具体电路图。其中，异常判断单元111具体为比较器111，保持单元112具体为两个D触发器112a和112b。温度传感器101检测加热辊102的温度T，并将与该温度T相对应的电压U输入到比较器111的“+”输入端，而比较器111的“-”输入端与异常基准电压U1相连。在电源电压Vcc和电阻R0不变的情况下，由于温度传感器101中的热电阻(图未视)的特性，随着温度T上升，电压U下降。如果电压U小于等于预定的异常基准电压U1(即，加热辊的温度T大于等于预定的阈值T1)，那么比较器111就会输出低电平L，即，异常信号L。Referring to FIG. 2 , there is shown a specific circuit diagram of the heating roller control device 11 according to the first embodiment of the present invention. Wherein, the abnormality judging unit 111 is specifically a comparator 111, and the holding unit 112 is specifically two D flip-flops 112a and 112b. The temperature sensor 101 detects the temperature T of the heating roller 102, and inputs the voltage U corresponding to the temperature T to the "+" input terminal of the comparator 111, and the "-" input terminal of the comparator 111 is connected to the abnormal reference voltage U1 . Under the condition that the power supply voltage Vcc and the resistance R0 are constant, due to the characteristics of the thermal resistor (not shown in the figure) in the temperature sensor 101, as the temperature T increases, the voltage U decreases. If the voltage U is less than or equal to the predetermined abnormal reference voltage U1 (ie, the temperature T of the heating roller is greater than or equal to the predetermined threshold T1), then the comparator 111 will output a low level L, ie, an abnormal signal L.
本例中，例如预定的阈值T1为220℃，则相应的异常基准电压U1被设定为0.8V。在CPU等软件异常的情况下，电源单元12持续对加热辊102进行加热，导致加热辊102的温度T持续上升，当温度T大于等于220℃，即，电压U小于等于0.8V时，比较器111输出低电平L。In this example, for example, if the predetermined threshold T1 is 220° C., the corresponding abnormal reference voltage U1 is set to 0.8V. When the software such as CPU is abnormal, the power supply unit 12 continues to heat the heating roller 102, causing the temperature T of the heating roller 102 to continue to rise. When the temperature T is greater than or equal to 220°C, that is, when the voltage U is less than or equal to 0.8V, the 111 outputs low level L.
采样信号产生单元114接收温度传感器101检测到的温度T，当温度T大于等于预定的采样阈值T2时，产生采样信号B。其中，阈值T1小于采样阈值T2，且采样阈值T2不会2对定影单元10造成损伤，从而确保整个图像形成设备不受损伤。The sampling signal generation unit 114 receives the temperature T detected by the temperature sensor 101, and generates a sampling signal B when the temperature T is greater than or equal to a predetermined sampling threshold T2. Wherein, the threshold T1 is smaller than the sampling threshold T2, and the sampling threshold T2 will not cause damage to the fixing unit 10, thereby ensuring that the entire image forming device is not damaged.
采样信号产生单元114包括比较单元1141，比较单元1141接收温度传感器101检测到的温度T，将温度T与采样阈值T2进行比较，并且当温度值T大于等于采样阈值T2时，产生采样信号B。The sampling signal generation unit 114 includes a comparison unit 1141. The comparison unit 1141 receives the temperature T detected by the temperature sensor 101, compares the temperature T with the sampling threshold T2, and generates a sampling signal B when the temperature value T is greater than or equal to the sampling threshold T2.
本例中，比较单元1141例如是比较器1141，该比较器1141的“-”输入端与温度传感器101的电压U相连，“+”输入端与基准电压U2相连。其中，采样阈值T2比阈值T1略高，例如是225℃，同时确保不会对定影单元10造成损伤。采样阈值T2为225℃，相对应的基准电压U2例如设为0.7V。当温度T小于采样阈值225℃时，即，当电压U大于基准电压0.7V时，比较器1141输出低电平，而当温度T大于等于采样阈值225℃时，即，当电压U小于等于基准电压0.7V时，比较器1141输出高电平，此时，产生一个上升沿信号，即，采样信号B。In this example, the comparison unit 1141 is, for example, a comparator 1141 , the “-” input terminal of the comparator 1141 is connected to the voltage U of the temperature sensor 101 , and the “+” input terminal is connected to the reference voltage U2 . Wherein, the sampling threshold T2 is slightly higher than the threshold T1 , for example, 225° C., while ensuring that no damage to the fixing unit 10 is caused. The sampling threshold T2 is 225° C., and the corresponding reference voltage U2 is set to 0.7V, for example. When the temperature T is less than the sampling threshold 225°C, that is, when the voltage U is greater than the reference voltage 0.7V, the comparator 1141 outputs a low level, and when the temperature T is greater than or equal to the sampling threshold 225°C, that is, when the voltage U is less than or equal to the reference voltage When the voltage is 0.7V, the comparator 1141 outputs a high level, and at this time, a rising edge signal, that is, the sampling signal B is generated.
这里，采样阈值T2的上限温度为确保不会对定影单元10造成损伤的温度，而采样阈值T2的下限温度对应于从阈值T1上升到采样阈值T2的时间要大于D触发器112a的反应时间。即，从阈值T1上升到采样阈值T2的时间要大于D触发器112a的反应时间，以确保D触发器112a正常传输低电平L。Here, the upper limit temperature of the sampling threshold T2 is a temperature that ensures no damage to the fixing unit 10, and the lower limit temperature of the sampling threshold T2 corresponds to the time from the threshold T1 to the sampling threshold T2 being longer than the response time of the D flip-flop 112a. That is, the rising time from the threshold T1 to the sampling threshold T2 is longer than the response time of the D flip-flop 112a, so as to ensure that the D flip-flop 112a transmits the low level L normally.
采样信号产生单元114还包括分压电路1142，分压电路1142包括串联的分压电阻R3、R4。如图2所示，通过电源电压Vcc和分压电阻R1、R2来设定基准电压U1，并且通过电源电压Vcc和分压电阻R3、R4来设定基准电压U2。The sampling signal generating unit 114 further includes a voltage divider circuit 1142, and the voltage divider circuit 1142 includes series voltage divider resistors R3 and R4. As shown in FIG. 2 , the reference voltage U1 is set by the power supply voltage Vcc and the voltage dividing resistors R1 , R2 , and the reference voltage U2 is set by the power supply voltage Vcc and the voltage dividing resistors R3 , R4 .
保持单元112包括至少一个D触发器，本例中，包括两个D触发器112a、112b，D触发器112a的输入端(D端)与比较器111的输出端相连，D触发器112a的时钟端(CLK端)与比较器1141的输出端相连，D触发器112a的输出端(Q端)与D触发器112b的置位端(PRE端)相连，D触发器112b的输出端(Q端)和稍后描述的与门113的一个输入端相连。此外，如图2所示，D触发器112a的复位端(S端)与复位电路相连，其置位端(PRE端)与电源电压Vcc相连，D触发器112b的复位端(S端)与电源电压Vcc相连，而D触发器112b的时钟端(CLK端)与复位电路相连。The holding unit 112 includes at least one D flip-flop. In this example, two D flip-flops 112a and 112b are included. The input terminal (D end) of the D flip-flop 112a is connected to the output end of the comparator 111, and the clock of the D flip-flop 112a Terminal (CLK terminal) is connected with the output terminal of comparator 1141, the output terminal (Q terminal) of D flip-flop 112a is connected with the setting terminal (PRE terminal) of D flip-flop 112b, the output terminal (Q terminal) of D flip-flop 112b ) is connected to one input terminal of an AND gate 113 described later. In addition, as shown in FIG. 2, the reset terminal (S terminal) of the D flip-flop 112a is connected to the reset circuit, its set terminal (PRE terminal) is connected to the power supply voltage Vcc, and the reset terminal (S terminal) of the D flip-flop 112b is connected to the power supply voltage Vcc. The power supply voltage Vcc is connected, and the clock terminal (CLK terminal) of the D flip-flop 112b is connected to the reset circuit.
D触发器112a的输入端(D端)接收从比较器111输出的异常信号L，并且在D触发器112a的时钟端(CLK端)接收到采样信号B(即，上升沿信号)时，异常信号L从D触发器112a的输入端(D端)被传输到D触发器112b的输出端(Q端)，从而输出异常信号L并进行保持。这里，由于D触发器公知的特性，D触发器112b的输出端始终输出异常信号L。另外，保持单元112中的两个D触发器112a、112b的具体连接和锁存的工作原理和现有技术中的一样，因此省略详细说明。The input end (D end) of D flip-flop 112a receives the abnormal signal L output from comparator 111, and when the clock end (CLK end) of D flip-flop 112a receives sampling signal B (that is, rising edge signal), abnormal The signal L is transmitted from the input terminal (D terminal) of the D flip-flop 112a to the output terminal (Q terminal) of the D flip-flop 112b, whereby the abnormal signal L is output and held. Here, due to the well-known characteristics of the D flip-flop, the output terminal of the D flip-flop 112b always outputs the abnormal signal L. In addition, the specific connection and latching working principle of the two D flip-flops 112a, 112b in the holding unit 112 are the same as those in the prior art, so detailed description is omitted.
电源控制单元113包括至少一个与门，本例中，包括一个与门113，该与门113的一个输入端与D触发器112b的输出端(Q端)相连，与门113的输出端与电源单元12相连。另外，与门113的另一个输入端M与控制电源单元12的CPU(图未视)相连。在该CPU出现异常的情况下，在加热辊的温度异常高时CPU不能将电源单元12切断，而是始终输出高电平H，即，与门113的另一个输入端M始终输入高电平H。如此，当D触发器112b的输出端输出异常信号L(即，低电平L)时，与门113的输出端输出低电平，从而将电源单元12的开关(图未视)切断，以停止对加热辊102的加热。The power control unit 113 includes at least one AND gate. In this example, an AND gate 113 is included. An input terminal of the AND gate 113 is connected to the output terminal (Q terminal) of the D flip-flop 112b, and an output terminal of the AND gate 113 is connected to the power supply. Unit 12 is connected. In addition, the other input terminal M of the AND gate 113 is connected to the CPU (not shown) that controls the power supply unit 12 . When the CPU is abnormal, the CPU cannot cut off the power supply unit 12 when the temperature of the heating roller is abnormally high, but outputs a high level H all the time, that is, the other input terminal M of the AND gate 113 inputs a high level all the time H. In this way, when the output terminal of the D flip-flop 112b outputs the abnormal signal L (that is, low level L), the output terminal of the AND gate 113 outputs a low level, thereby cutting off the switch (not shown) of the power supply unit 12, so as to The heating of the heat roller 102 is stopped.
图3是根据本发明的第一实施例的加热辊控制装置中的相关信号随时间变化的状态图，如图3所示，随着加热辊102的温度上升，温度传感器的电压U下降，当电压U小于等于基准电压U1时，比较器111的输出端输出低电平L。随着加热辊102的温度持续上升，温度传感器的电压U持续下降，例如，在时刻t1，电压U小于等于基准电压U2，比较器1141的输出端输出的采样信号B就由低电平变为高电平，即，产生一个上升沿信号。此时，D触发器112b的输出端(Q端)就输出低电平L，并保持该低电平L。也就是说，不管加热辊102的温度是否下降，D触发器112b的输出端始终保持为低电平L，即，对低电平L进行锁存，从而通过后续的与门113切断电源单元12对加热辊102的供电，以停止对加热辊102的加热。采样信号B是方波信号。Fig. 3 is a state diagram of relative signals changing with time in the heating roller control device according to the first embodiment of the present invention. As shown in Fig. 3, as the temperature of the heating roller 102 rises, the voltage U of the temperature sensor drops, when When the voltage U is less than or equal to the reference voltage U1 , the output terminal of the comparator 111 outputs a low level L. As the temperature of the heating roller 102 continues to rise, the voltage U of the temperature sensor continues to drop. For example, at time t1, the voltage U is less than or equal to the reference voltage U2, and the sampling signal B output from the output terminal of the comparator 1141 changes from low level to High level, that is, a rising edge signal is generated. At this time, the output terminal (Q terminal) of the D flip-flop 112b outputs a low level L and keeps the low level L. That is to say, no matter whether the temperature of the heating roller 102 drops, the output terminal of the D flip-flop 112b is always kept at the low level L, that is, the low level L is latched, thereby cutting off the power supply unit 12 through the subsequent AND gate 113. The power supply to the heating roller 102 stops the heating of the heating roller 102 . The sampling signal B is a square wave signal.
由于在电源单元12中无需设置产生采样信号的元器件，因此电源单元12的结构简单，并且制造成本降低。虽然在加热辊控制装置11中设置了采样信号产生单元114，但是如上描述可知，该采样信号产生单元114也是由结构简单且低成本的比较器1141和分压电阻R3、R4构成。因此，与在电源单元12中设置产生采样信号的元器件相比，结构更加简单，成本也降低。如此，整个图像形成设备的制造成本也降低。Since there is no need to arrange components for generating sampling signals in the power supply unit 12, the structure of the power supply unit 12 is simple, and the manufacturing cost is reduced. Although the sampling signal generating unit 114 is provided in the heating roller control device 11, as can be seen from the above description, the sampling signal generating unit 114 is also composed of a simple and low-cost comparator 1141 and voltage dividing resistors R3 and R4. Therefore, compared with providing components for generating sampling signals in the power supply unit 12, the structure is simpler and the cost is also reduced. In this way, the manufacturing cost of the entire image forming apparatus is also reduced.
参见图4，图4是根据本发明的第二实施例的加热辊控制装置的电路图。其中，与第一实施例中相同的部分省略描述，而仅仅描述与第一实施例中不同的部分。Referring to FIG. 4, FIG. 4 is a circuit diagram of a heating roller control device according to a second embodiment of the present invention. Wherein, descriptions of the same parts as those in the first embodiment are omitted, and only parts different from those in the first embodiment are described.
本例中，采样信号产生单元例如是不控制电源单元12的CPU 40。该CPU 40是图像形成设备中进行图像处理等的控制单元。本发明中，利用CPU 40来产生采样信号C，如图5所示，该采样信号C是方波信号，频率为例如50Hz。CPU 40与D触发器112a的时钟端(CLK端)相连，用于将产生的方波信号输入D触发器112a的时钟端(CLK端)。In this example, the sampling signal generating unit is, for example, the CPU 40 that does not control the power supply unit 12. The CPU 40 is a control unit that performs image processing and the like in the image forming apparatus. Among the present invention, utilize CPU 40 to generate sampling signal C, as shown in Figure 5, this sampling signal C is a square wave signal, and frequency is such as 50Hz. CPU 40 is connected with the clock end (CLK end) of D flip-flop 112a, is used for inputting the clock end (CLK end) of D flip-flop 112a with the square wave signal that produces.
图5是根据本发明的第二实施例的加热辊控制装置中的相关信号随时间变化的状态图，如图5所示，随着加热辊102的温度上升，温度传感器的电压U下降，当电压U小于等于基准电压U1时，比较器111的输出端输出低电平L(即，异常信号)。之后，在时刻t1，采样信号C中出现上升沿，那么低电平L就从D触发器112a的D端被传输到D触发器112b的输出端(Q)端，从而输出低电平L，并对该低电平L进行保持。不管加热辊102的温度是否下降，D触发器112b的输出端始终保持为低电平L，即，对低电平L进行锁存，从而通过后续的与门113切断电源单元12对加热辊102的供电，以停止对加热辊102的加热。FIG. 5 is a state diagram showing the time-varying state of the relevant signals in the heating roller control device according to the second embodiment of the present invention. As shown in FIG. 5 , as the temperature of the heating roller 102 rises, the voltage U of the temperature sensor drops. When the voltage U is less than or equal to the reference voltage U1, the output terminal of the comparator 111 outputs a low level L (ie, an abnormal signal). After that, at time t1, a rising edge appears in the sampling signal C, then the low level L is transmitted from the D terminal of the D flip-flop 112a to the output terminal (Q) of the D flip-flop 112b, thereby outputting the low level L, And maintain the low level L. Regardless of whether the temperature of the heating roller 102 drops, the output terminal of the D flip-flop 112b remains at a low level L all the time, that is, the low level L is latched, thereby cutting off the power supply unit 12 to the heating roller 102 through the subsequent AND gate 113. to stop the heating of the heating roller 102.
本实施例中，在电源单元12中无需设置产生采样信号的元器件，同时，采样信号产生单元是图像形成设备中原有的CPU 40，即，在加热辊控制装置11中并没有增加任何元器件。因此，与第一实施例相比，整个图像形成设备的制造成本进一步降低。In this embodiment, there is no need to set components and parts that generate sampling signals in the power supply unit 12, and at the same time, the sampling signal generating unit is the original CPU 40 in the image forming equipment, that is, no components and parts are added in the heating roller control device 11 . Therefore, compared with the first embodiment, the manufacturing cost of the entire image forming apparatus is further reduced.
图6是根据本发明的第三实施例的加热辊控制装置的电路图。其中，与第一实施例中相同的部分省略描述，而仅仅描述与第一实施例中不同的部分。Fig. 6 is a circuit diagram of a heat roller control device according to a third embodiment of the present invention. Wherein, descriptions of the same parts as those in the first embodiment are omitted, and only parts different from those in the first embodiment are described.
本例中，采样信号产生单元例如包括：振荡器61和触发器62，振荡器61产生正弦波信号，触发器62对正弦波信号进行整形，从而产生方波状的采样信号。振荡器61例如是正弦波振荡器，例如产生50Hz的正弦波。正弦波振荡器61的输入端与电源电压Vcc相连，正弦波振荡器61的输出端与触发器62的输入端相连，触发器62的输出端与D触发器112a的时钟端(CLK端)相连。In this example, the sampling signal generation unit includes, for example: an oscillator 61 and a flip-flop 62 , the oscillator 61 generates a sine wave signal, and the flip-flop 62 shapes the sine wave signal to generate a square wave sampling signal. The oscillator 61 is, for example, a sine wave oscillator, which generates a 50 Hz sine wave, for example. The input end of the sine wave oscillator 61 is connected to the power supply voltage Vcc, the output end of the sine wave oscillator 61 is connected to the input end of the flip-flop 62, and the output end of the flip-flop 62 is connected to the clock end (CLK end) of the D flip-flop 112a .
触发器62对正弦波信号进行整形，产生采样信号，该采样信号C例如是50Hz的方波信号，如图5所示。本例中，加热辊控制装置中的相关信号随时间变化的状态与图5中显示的一样，即，和第二实施例中的一样，因此不再详细描述。The flip-flop 62 shapes the sine wave signal to generate a sampling signal. The sampling signal C is, for example, a 50 Hz square wave signal, as shown in FIG. 5 . In this example, the time-dependent state of the relevant signals in the heating roller control device is the same as that shown in FIG. 5 , that is, the same as that in the second embodiment, and thus will not be described in detail.
如上所述，本发明中，无需在电源单元中设置产生采样信号的元器件，而是利用本发明中的采样信号产生单元来产生采样信号，如此，可以使得电源单元的结构简单，制造成本降低，从而使得整个图像形成设备的制造成本降低。As mentioned above, in the present invention, there is no need to set components and parts that generate sampling signals in the power supply unit, but the sampling signal generation unit in the present invention is used to generate sampling signals, so that the structure of the power supply unit can be simplified and the manufacturing cost can be reduced. , so that the manufacturing cost of the entire image forming apparatus is reduced.
虽然本发明一直结合特定实施例进行描述，但是显而易见的是，对于本领域的技术人员而言，根据前面的描述，可以对本发明进行许多轻而易举的替换、修改和变更。因此，本发明旨在包括落在所附的权利要求的构思和范围内的所有这种替换、修改和变更。While the invention has been described in conjunction with specific embodiments, it will be apparent to those skilled in the art that many alternatives, modifications and variations of the invention may readily be made in light of the foregoing description. Accordingly, the present invention is intended to embrace all such alterations, modifications and changes that fall within the spirit and scope of the appended claims.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210038777.8ACN103257557B (en) | 2012-02-20 | 2012-02-20 | Heating roller control apparatus |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210038777.8ACN103257557B (en) | 2012-02-20 | 2012-02-20 | Heating roller control apparatus |
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| CN103257557A CN103257557A (en) | 2013-08-21 |
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| CN201210038777.8AExpired - Fee RelatedCN103257557B (en) | 2012-02-20 | 2012-02-20 | Heating roller control apparatus |
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