技术领域technical field
本发明涉及变频空调控制技术领域，具体而言，涉及一种变频控制电路和一种空调器。The invention relates to the technical field of frequency conversion air conditioner control, in particular to a frequency conversion control circuit and an air conditioner.
背景技术Background technique
功率因数校正(Power Factor Correction，PFC)通常采用电流内环和电压外环的双闭环控制结构，电压环的作用是调节PFC输出电压使其保持稳定，电压环输入信号一般是PFC输出电压的反馈信号，取自电阻分压。Power Factor Correction (PFC) usually adopts a double closed-loop control structure of current inner loop and voltage outer loop. The function of the voltage loop is to adjust the PFC output voltage to keep it stable. The input signal of the voltage loop is generally the feedback of the PFC output voltage. Signal, taken from resistor divider.
但是，当电阻分压中分压电阻的阻值发生变化时，如分压电阻因硫化导致阻值变小，PFC输出电压的反馈信号也随之变化，可能会引起PFC输出电压异常升高，甚至会超出平滑电解电容及其它电子元器件的额定电压值，最终导致器件的失效，从而影响产品品质。However, when the resistance value of the voltage divider resistor in the resistor divider changes, such as the resistance value of the divider resistor becomes smaller due to vulcanization, the feedback signal of the PFC output voltage also changes accordingly, which may cause the PFC output voltage to rise abnormally. It may even exceed the rated voltage value of smoothing electrolytic capacitors and other electronic components, which will eventually lead to the failure of the device, thereby affecting product quality.
发明内容Contents of the invention
本发明旨在至少解决现有技术或相关技术中存在的技术问题之一。The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
为此，本发明的一个目的在于提供一种变频控制电路。Therefore, an object of the present invention is to provide a frequency conversion control circuit.
本发明的另一个目的在于提供一种空调器。Another object of the present invention is to provide an air conditioner.
为了实现上述目的，根据本发明的第一方面的实施例，提供了一种变频控制电路，包括：逆变器控制单元，连接至PFC控制单元，逆变器控制单元还连接至直流母线电压信号的第二采样端，用于比较第二采样端的采样电压与预设电压的大小关系，并根据大小关系来判断直流母线电压信号是否异常，并向PFC控制单元发送是否异常的信号，PFC控制单元根据逆变器控制单元发送的信号来判断是否按照第一采样端的采样电压进行电压环控制以及调节PFC开关器件的导通与截止。In order to achieve the above object, according to an embodiment of the first aspect of the present invention, a frequency conversion control circuit is provided, including: an inverter control unit connected to the PFC control unit, and the inverter control unit is also connected to the DC bus voltage signal The second sampling terminal of the second sampling terminal is used to compare the magnitude relationship between the sampling voltage of the second sampling terminal and the preset voltage, and judge whether the DC bus voltage signal is abnormal according to the magnitude relationship, and send a signal whether it is abnormal to the PFC control unit, and the PFC control unit According to the signal sent by the inverter control unit, it is judged whether the voltage loop control is performed according to the sampling voltage of the first sampling terminal and the on and off of the PFC switching device is adjusted.
在该技术方案中，逆变器控制单元通过比较直流母线采样电压与预设电压的大小关系来判断直流母线电压信号是否异常，并向PFC控制单元发送是否异常信号，PFC控制单元根据逆变器控制单元发送的信号来判断是否按照第一采样端的采样电压进行电压环控制以及调整PFC开关器件的导通与截止，提高了变频控制电路的可靠性。逆变器控制单元连接至直流母线电压信号的第二采样端，通过电压采样电路获取直流母线的采样电压，其中，逆变器控制单元的采样电路获得的采样电压可用如下公式表示：In this technical solution, the inverter control unit judges whether the DC bus voltage signal is abnormal by comparing the magnitude relationship between the DC bus sampling voltage and the preset voltage, and sends an abnormal signal to the PFC control unit. The signal sent by the control unit is used to determine whether to perform voltage loop control according to the sampling voltage of the first sampling terminal and to adjust the on and off of the PFC switching device, thereby improving the reliability of the frequency conversion control circuit. The inverter control unit is connected to the second sampling terminal of the DC bus voltage signal, and the sampling voltage of the DC bus is obtained through a voltage sampling circuit, wherein the sampling voltage obtained by the sampling circuit of the inverter control unit can be expressed by the following formula:
其中，VFB2为第二采样端的采用电压，RFB4，RFB5，RFB6为第二采样端的三个分压电阻，VPFC为直流母线电压信号的电压值。Wherein, VFB2 is the adopted voltage of the second sampling terminal, RFB4 , RFB5 , and RFB6 are three voltage dividing resistors of the second sampling terminal, and VPFC is the voltage value of the DC bus voltage signal.
比较第二采样端的采样电压与预设电压的大小，当判断该采样电压大于预设电压时，逆变器控制单元发出直流母线电压异常信号，经由逆变控制单元与PFC控制单元的连接电路传送至PFC控制单元，PFC控制单元根据该异常信号，停止按照第一采样端的采样电压进行电压环控制以及调整PFC开关器件的导通与截止，直接关断PFC开关器件。Compare the sampling voltage of the second sampling terminal with the preset voltage, and when it is judged that the sampling voltage is greater than the preset voltage, the inverter control unit sends a DC bus voltage abnormal signal, which is transmitted through the connection circuit between the inverter control unit and the PFC control unit To the PFC control unit, the PFC control unit stops the voltage loop control according to the sampling voltage of the first sampling terminal and adjusts the on and off of the PFC switching device according to the abnormal signal, and directly turns off the PFC switching device.
上述PFC控制单元、PFC开关器件、升压二极管和PFC电感共同构成了PFC电路。当判断该采样电压小于等于预设电压时，逆变器控制单元发出直流母线电压正常信号或不发出任何信号，由于PFC控制单元连接至母线电压信号的第一采样端，PFC控制单元根据第一采样端的采样电压进行电压环控制PFC开关器件的导通与截止。The above-mentioned PFC control unit, PFC switching device, boost diode and PFC inductor together constitute a PFC circuit. When it is judged that the sampled voltage is less than or equal to the preset voltage, the inverter control unit sends out a DC bus voltage normal signal or does not send any signal. Since the PFC control unit is connected to the first sampling terminal of the bus voltage signal, the PFC control unit according to the first The sampling voltage at the sampling terminal performs a voltage loop to control the on and off of the PFC switching device.
优选地，直流母线电压信号的第二采样端除了用于判断直流母线电压信号是否异常，作为直流电机控制的电流环控制也是不可或缺的参数。Preferably, the second sampling terminal of the DC bus voltage signal is not only used for judging whether the DC bus voltage signal is abnormal, but also serves as an indispensable parameter for the current loop control of the DC motor control.
优选地，第一采样电路与第二采样电路检测的都是直流母线电压信号，即第一采样端与第二采样端都取自滤波电路(即平滑电解电容)的两端。Preferably, both the first sampling circuit and the second sampling circuit detect the DC bus voltage signal, that is, both the first sampling terminal and the second sampling terminal are taken from both ends of the filter circuit (ie, smoothing electrolytic capacitor).
在上述任一技术方案中，优选地，变频控制电路还包括：整流电路，设于变频控制电路的输入端，用于将交流输入电压变换为脉动直流电压。In any of the above technical solutions, preferably, the frequency conversion control circuit further includes: a rectification circuit, provided at the input end of the frequency conversion control circuit, for converting the AC input voltage into a pulsating DC voltage.
在上述任一技术方案中，优选地，整流电路为桥式整流电路。In any of the above technical solutions, preferably, the rectification circuit is a bridge rectification circuit.
在上述任一技术方案中，优选地，变频控制电路还包括：滤波电路，连接至整流电路的输出端，滤波电路用于滤去整流电路输出的纹波电压，将整流后的脉动直流电压变换成平滑的直流电压。In any of the above technical solutions, preferably, the frequency conversion control circuit further includes: a filter circuit connected to the output terminal of the rectifier circuit, the filter circuit is used to filter the ripple voltage output by the rectifier circuit, and convert the rectified pulsating DC voltage into a smooth DC voltage.
具体地，滤波电路连接至整流电路的输出端，滤波电路用于滤去整流电路输出的纹波电压，将整流后的脉动直流电压变换成平滑的直流电压。Specifically, the filter circuit is connected to the output end of the rectification circuit, and the filter circuit is used for filtering the ripple voltage output by the rectification circuit, and converting the rectified pulsating DC voltage into a smooth DC voltage.
在上述任一技术方案中，优选地，滤波电路包括多个并联和/或串联的电解电容，滤波电路的正极连接于第一采样端，滤波电路的负极接地。In any of the above technical solutions, preferably, the filter circuit includes a plurality of parallel and/or series electrolytic capacitors, the positive pole of the filter circuit is connected to the first sampling terminal, and the negative pole of the filter circuit is grounded.
在上述任一技术方案中，优选地，变频控制电路还包括：逆变电路，逆变电路用于将直流电变换成交流电，设于变频控制电路的输出端，由6个导电臂组成，每个导电臂由IGBT和反向恢复二极管并联组成。In any of the above-mentioned technical solutions, preferably, the frequency conversion control circuit further includes: an inverter circuit, the inverter circuit is used to convert direct current into alternating current, and is provided at the output end of the frequency conversion control circuit, consisting of 6 conductive arms, each The conductive arm consists of an IGBT and a reverse recovery diode connected in parallel.
在上述任一技术方案中，优选地，变频控制电路还包括：PFC电路，PFC电路用于改善功率因数，由PFC开关器件、升压二极管、PFC电感及PFC控制单元组成。In any of the above technical solutions, preferably, the frequency conversion control circuit further includes: a PFC circuit, which is used to improve power factor and is composed of a PFC switching device, a boost diode, a PFC inductor and a PFC control unit.
在上述任一技术方案中，优选地，PFC电感连接于整流电路的输出端与滤波电路的输入端之间，升压二极管的阳极连接至PFC电感的输出端，升压二极管的阴极连接至滤波电路的输入端，PFC控制单元的输出端连接于PFC开关器件的栅极端，PFC开关器件的集电极连接至升压二极管的阳极，PFC开关器件的发射极连接至采样电阻的一端，采样电阻的另一端接地。In any of the above technical solutions, preferably, the PFC inductor is connected between the output terminal of the rectifier circuit and the input terminal of the filter circuit, the anode of the boost diode is connected to the output terminal of the PFC inductor, and the cathode of the boost diode is connected to the filter circuit. The input terminal of the circuit, the output terminal of the PFC control unit are connected to the gate terminal of the PFC switching device, the collector of the PFC switching device is connected to the anode of the boost diode, the emitter of the PFC switching device is connected to one end of the sampling resistor, and the sampling resistor The other end is grounded.
在上述任一技术方案中，优选地，PFC控制单元包括：第一误差放大器，第一误差放大器的负极输入端连接至第一采样端，第一误差放大器的正极输入端接入参考电压，用于输出第一采样端的采样电压与参考电压之间的电压误差信号；乘法器，乘法器的第一输入端连接至第一误差放大器的输出端，用于获取电压误差信号，乘法器的第二输入端接入整流电路输出的整流电压信号；第二误差放大器，第二误差放大器的负极输入端连接至PFC开关器件的发射极与采样电阻之间，第二误差放大器的正极输入端接入乘法器输出的乘法计算结果；PWM比较器，PWM比较器的正极端接入振荡器输出的三角波，PWM比较器的负极端连接至第二误差放大器的输出端，PWM比较器的输出端连接至PFC开关器件的栅极端，用于输出PWM信号以控制PFC开关器件的导通与截止。In any of the above-mentioned technical solutions, preferably, the PFC control unit includes: a first error amplifier, the negative input terminal of the first error amplifier is connected to the first sampling terminal, and the positive input terminal of the first error amplifier is connected to the reference voltage. Output the voltage error signal between the sampling voltage and the reference voltage of the first sampling terminal; the multiplier, the first input terminal of the multiplier is connected to the output terminal of the first error amplifier, for obtaining the voltage error signal, the second of the multiplier The input terminal is connected to the rectified voltage signal output by the rectification circuit; the second error amplifier, the negative input terminal of the second error amplifier is connected between the emitter of the PFC switching device and the sampling resistor, and the positive input terminal of the second error amplifier is connected to the multiplier The multiplication calculation result output by the PWM comparator; the PWM comparator, the positive terminal of the PWM comparator is connected to the triangle wave output by the oscillator, the negative terminal of the PWM comparator is connected to the output terminal of the second error amplifier, and the output terminal of the PWM comparator is connected to the PFC The gate terminal of the switch device is used to output a PWM signal to control the turn-on and cut-off of the PFC switch device.
根据本发明的第二方面的技术方案，提供了一种空调器，包括：电机；如上述任一项技术方案的变频控制电路，变频控制电路的输出端连接至电机的输入端。According to the technical solution of the second aspect of the present invention, an air conditioner is provided, including: a motor; the frequency conversion control circuit according to any one of the above technical solutions, the output terminal of the frequency conversion control circuit is connected to the input terminal of the motor.
本发明的附加方面和优点将在下面的描述部分中给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
附图说明Description of drawings
本发明的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:
图1示出了根据本发明的一个实施例的变频控制电路的示意图；FIG. 1 shows a schematic diagram of a frequency conversion control circuit according to an embodiment of the present invention;
图2示出了根据本发明的另一个实施例变频控制电路的示意图；FIG. 2 shows a schematic diagram of a frequency conversion control circuit according to another embodiment of the present invention;
图3示出了根据本发明的一个实施例的空调器的变频控制电路的示意图。Fig. 3 shows a schematic diagram of an inverter control circuit of an air conditioner according to an embodiment of the present invention.
其中，附图标记及其对应的结构名称为：PFC开关器件T，逆变器控制单元106，第一采样端A，第二采样端B，整流电路102，滤波电路104，逆变电路108，PFC控制单元110，PFC电感L，升压二极管D，第一采样端分压电阻RFB1、RFB2、RFB3，第二采样端分压电阻RFB4、RFB5、RFB6，采样电阻RCS，电解电容E1，电解电容E2，电解电容E3，电阻RIAC，电阻RM，第二误差放大器202，PWM比较器204，第一误差放大器206，乘法器208，自振荡器OSC，电机M。Wherein, reference numerals and their corresponding structural names are: PFC switching device T, inverter control unit 106, first sampling terminal A, second sampling terminal B, rectification circuit 102, filter circuit 104, inverter circuit 108, PFC control unit 110, PFC inductor L, boost diode D, first sampling terminal voltage dividing resistors RFB1 ,RFB2 ,RFB3 , second sampling terminal voltage dividing resistors RFB4 ,RFB5 ,RFB6 , sampling resistor RCS , electrolytic capacitor E1, electrolytic capacitor E2, electrolytic capacitor E3, resistor RIAC , resistor RM , second error amplifier 202, PWM comparator 204, first error amplifier 206, multiplier 208, self-oscillator OSC, motor M.
具体实施方式Detailed ways
为了能够更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施方式对本发明进行进一步的详细描述。需要说明的是，在不冲突的情况下，本申请的实施例及实施例中的特征可以相互组合。In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.
在下面的描述中阐述了很多具体细节以便于充分理解本发明，但是，本发明还可以采用其他不同于在此描述的其他方式来实施，因此，本发明的保护范围并不受下面公开的具体实施例的限制。In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.
图1示出了根据本发明的一个实施例的的变频控制电路的示意图。Fig. 1 shows a schematic diagram of a frequency conversion control circuit according to an embodiment of the present invention.
图2示出了根据本发明的另一个实施例的变频控制电路的示意图；Fig. 2 shows a schematic diagram of a frequency conversion control circuit according to another embodiment of the present invention;
图3示出了根据本发明的一个实施例的空调器的变频控制电路的示意图。Fig. 3 shows a schematic diagram of an inverter control circuit of an air conditioner according to an embodiment of the present invention.
下面结合图1和图2对根据本发明的实施例的变频控制电路进行具体说明。The frequency conversion control circuit according to the embodiment of the present invention will be specifically described below with reference to FIG. 1 and FIG. 2 .
如图1所示，根据本发明的实施例的变频控制电路，包括：逆变器控制单元106，连接至PFC控制单元110，逆变器控制单元106还连接至直流母线电压信号的第二采样端B，用于比较第二采样端B的采样电压与预设电压的大小关系，并根据大小关系来判断直流母线电压信号是否异常，并向PFC控制单元110发送是否异常的信号，PFC控制单元根据逆变器控制单元发送的信号来判断是否按照第一采样端的采样电压进行电压环控制以及调节PFC开关器件的导通与截止。As shown in Figure 1, the frequency conversion control circuit according to the embodiment of the present invention includes: an inverter control unit 106 connected to the PFC control unit 110, and the inverter control unit 106 is also connected to the second sampler of the DC bus voltage signal Terminal B is used to compare the magnitude relationship between the sampling voltage of the second sampling terminal B and the preset voltage, and judge whether the DC bus voltage signal is abnormal according to the magnitude relationship, and send a signal whether it is abnormal to the PFC control unit 110, and the PFC control unit According to the signal sent by the inverter control unit, it is judged whether the voltage loop control is performed according to the sampling voltage of the first sampling terminal and the on and off of the PFC switching device is adjusted.
在该技术方案中，逆变器控制单元106通过比较直流母线采样电压与预设电压的大小关系来判断直流母线电压信号是否异常，并向PFC控制单元110发送是否异常信号，PFC控制单元110根据逆变器控制单元106发送的信号来判断是否按照第一采样端A的采样电压进行电压环控制以及调整PFC开关器件的导通与截止，提高了变频控制电路的可靠性。逆变器控制单元106连接至直流母线电压信号的第二采样端B，通过电压采样电路获取直流母线的采样电压，其中，逆变器控制单元106的采样电路获得的采样电压可用如下公式表示：In this technical solution, the inverter control unit 106 judges whether the DC bus voltage signal is abnormal by comparing the magnitude relationship between the DC bus sampling voltage and the preset voltage, and sends an abnormal signal to the PFC control unit 110, and the PFC control unit 110 according to The signal sent by the inverter control unit 106 is used to determine whether the voltage loop control is performed according to the sampling voltage of the first sampling terminal A and to adjust the on and off of the PFC switching device, which improves the reliability of the frequency conversion control circuit. The inverter control unit 106 is connected to the second sampling terminal B of the DC bus voltage signal, and obtains the sampling voltage of the DC bus through a voltage sampling circuit, wherein the sampling voltage obtained by the sampling circuit of the inverter control unit 106 can be expressed by the following formula:
其中，VFB2为逆变器控制单元106第二采样端B的采样电压，RFB4，RFB5，RFB6为逆变器控制单元106第二采样端B的三个分压电阻，RFB4，RFB5，RFB6可以是但不局限于三个分压电阻，VPFC为直流母线电压信号的电压值。Wherein, VFB2 is the sampling voltage of the second sampling terminal B of the inverter control unit 106, RFB4 , RFB5 , and RFB6 are three voltage dividing resistors of the second sampling terminal B of the inverter control unit 106, RFB4 , RFB5 and RFB6 may be but not limited to three voltage dividing resistors, and VPFC is the voltage value of the DC bus voltage signal.
同样地，PFC控制单元110检测的第一采样端A的采样电压，可用如下公式表示：Similarly, the sampling voltage of the first sampling terminal A detected by the PFC control unit 110 can be expressed by the following formula:
其中，VFB1为第一采样端A的采样电压，RFB1，RFB2，RFB3为第一采样端A的三个分压电阻，也即可能被硫化导致阻值漂移的电阻，RFB1，RFB2，RFB3可以是但不局限于三个分压电阻，VPFC为直流母线电压信号的电压值。Among them, VFB1 is the sampling voltage of the first sampling terminal A, RFB1 ,RFB2 , and RFB3 are the three voltage dividing resistors of the first sampling terminal A, that is, resistors that may be vulcanized to cause resistance drift, RFB1 , RFB2 and RFB3 may be but not limited to three voltage dividing resistors, and VPFC is the voltage value of the DC bus voltage signal.
优选地，直流母线电压信号的第二采样端B除了用于判断直流母线电压信号是否异常，作为直流电机控制的电流环控制也是不可或缺的参数。Preferably, the second sampling terminal B of the DC bus voltage signal is not only used for judging whether the DC bus voltage signal is abnormal, but also serves as an indispensable parameter for the current loop control of the DC motor control.
优选地，第一采样电路与第二采样电路检测的都是直流母线电压信号，即第一采样端A与第二采样端B都取自滤波电路(即平滑电解电容)的两端。比较第二采样端B的采样电压与预设电压的大小，当判断该采样电压大于预设电压时，逆变器控制单元106发出直流母线电压异常信号，经由逆变控制单元106与PFC控制单元110的连接电路传送至PFC控制单元110，PFC控制单元110根据该异常信号，停止按照第一采样端A的采样电压进行电压环控制以及调整PFC开关器件的导通与截止，直接关断PFC开关器件T，上述PFC控制单元110、PFC开关器件T、升压二极管D和PFC电感L共同构成了PFC电路。当判断该采样电压小于等于预设电压时，逆变器控制单元106发出直流母线电压正常信号或不发出任何信号，由于PFC控制单元110连接至母线电压信号的第一采样端A，PFC控制单元110根据第一采样端A的采样电压进行电压环控制PFC开关器件T的导通与截止。Preferably, both the first sampling circuit and the second sampling circuit detect DC bus voltage signals, that is, both the first sampling terminal A and the second sampling terminal B are taken from both ends of the filter circuit (ie, smoothing electrolytic capacitor). Comparing the sampled voltage of the second sampling terminal B with the preset voltage, when it is judged that the sampled voltage is greater than the preset voltage, the inverter control unit 106 sends a DC bus voltage abnormal signal, through the inverter control unit 106 and the PFC control unit The connection circuit of 110 is transmitted to the PFC control unit 110, and the PFC control unit 110 stops the voltage loop control according to the sampling voltage of the first sampling terminal A and adjusts the conduction and cut-off of the PFC switching device according to the abnormal signal, and directly turns off the PFC switch The device T, the above-mentioned PFC control unit 110 , the PFC switching device T, the boost diode D and the PFC inductor L together constitute a PFC circuit. When judging that the sampled voltage is less than or equal to the preset voltage, the inverter control unit 106 sends out a DC bus voltage normal signal or does not send any signal. Since the PFC control unit 110 is connected to the first sampling terminal A of the bus voltage signal, the PFC control unit 110 performs voltage loop control on and off of the PFC switching device T according to the sampling voltage of the first sampling terminal A.
在上述任一技术方案中，优选地，变频控制电路还包括：整流电路102，设于变频控制电路的输入端，用于将交流输入电压变换为直流电压，由四个二极管组成，四个二极管分别为VD11、VD12、VD13和VD14。In any of the above technical solutions, preferably, the frequency conversion control circuit further includes: a rectifier circuit 102, located at the input end of the frequency conversion control circuit, for converting the AC input voltage into a DC voltage, consisting of four diodes, the four diodes VD11 , VD12 , VD13 and VD14 , respectively.
在上述任一技术方案中，优选地，整流电路102为桥式整流电路。In any of the above technical solutions, preferably, the rectification circuit 102 is a bridge rectification circuit.
在上述任一技术方案中，优选地，变频控制电路还包括：滤波电路104，连接至整流电路102的输出端，滤波电路104用于滤去整流电路102输出的纹波电压，将整流后的脉动直流电变换成平滑的直流电，滤波电路由一个或多个电解电容组成。In any of the above technical solutions, preferably, the frequency conversion control circuit further includes: a filter circuit 104, connected to the output terminal of the rectifier circuit 102, the filter circuit 104 is used to filter the ripple voltage output by the rectifier circuit 102, and convert the rectified The pulsating direct current is transformed into smooth direct current, and the filter circuit is composed of one or more electrolytic capacitors.
其中，滤波电路104可以包括多个电解电容，如图1所示由三个并联的电解电容E1、电解电容E2和电解电容E3组成，也可以是一个较大容值的电解电容。Wherein, the filter circuit 104 may include a plurality of electrolytic capacitors, as shown in FIG. 1 , composed of three parallel electrolytic capacitors E1 , E2 and E3 , or may be an electrolytic capacitor with a larger capacitance.
在上述任一技术方案中，优选地，滤波电路104包括多个并联和/或串联的电解电容，滤波电路104的正极连接于第一采样端A，滤波电路104的负极接地。In any of the above technical solutions, preferably, the filter circuit 104 includes a plurality of parallel and/or series electrolytic capacitors, the positive pole of the filter circuit 104 is connected to the first sampling terminal A, and the negative pole of the filter circuit 104 is grounded.
在上述任一技术方案中，优选地，变频控制电路还包括：逆变电路108，逆变电路108用于将直流电变换成频率可调的交流电，设于变频控制电路的输出端，由6个导电臂组成，每个导电臂由IGBT和反向恢复二极管并联组成。In any of the above-mentioned technical solutions, preferably, the frequency conversion control circuit further includes: an inverter circuit 108, the inverter circuit 108 is used to convert direct current into frequency-adjustable alternating current, and is arranged at the output end of the frequency conversion control circuit, consisting of six Each conductive arm is composed of an IGBT and a reverse recovery diode connected in parallel.
其中，六个导电臂分别为TU上、TU下、TV上、TV下、TW上、TW下。Wherein, the six conductive arms are TU upper , TU lower , TV upper , TV lower , TW upper , and TW lower .
在上述任一技术方案中，优选地，变频控制电路还包括：PFC电路，PFC电路用于改善功率因数，由PFC开关器件T、升压二极管D、PFC电感L及PFC控制单元110组成。In any of the above technical solutions, preferably, the frequency conversion control circuit further includes: a PFC circuit, which is used to improve the power factor and is composed of a PFC switching device T, a boost diode D, a PFC inductor L and a PFC control unit 110 .
在上述任一技术方案中，优选地，PFC电感连接于整流电路102的输出端与滤波电路104的输入端之间，升压二极管D的阳极连接至PFC电感L的输出端，升压二极管D的阴极连接至滤波电路104的输入端，PFC控制单元110的输出端连接于PFC开关器件T的栅极，PFC开关器件T的集电极连接至升压二极管D的阳极，PFC开关器件T的发射极连接至采样电阻RCS的一端，采样电阻RCS的另一端接地。In any of the above technical solutions, preferably, the PFC inductor is connected between the output end of the rectifier circuit 102 and the input end of the filter circuit 104, the anode of the boost diode D is connected to the output end of the PFC inductor L, and the boost diode D The cathode of the PFC control unit 110 is connected to the input terminal of the filter circuit 104, the output terminal of the PFC control unit 110 is connected to the gate of the PFC switching device T, the collector of the PFC switching device T is connected to the anode of the boost diode D, and the emission of the PFC switching device T The pole is connected to one end of the sampling resistor RCS , and the other end of the sampling resistor RCS is grounded.
如图2所示，在上述任一技术方案中，优选地，PFC控制单元110包括：第一误差放大器206，第一误差放大器206的负极输入端连接至第一采样端A，第一误差放大器206的正极输入端接入参考电压VREF，用于输出第一采样端A的采样电压与参考电压之间的电压误差信号；乘法器208，乘法器208的第一输入端连接至第一误差放大器206的输出端，用于获取电压误差信号，乘法器208的第二输入端通过电阻RIAC接入整流电路102输出的整流电压信号，乘法器208生成电压误差信号和整流电压信号的乘积；第二误差放大器202，第二误差放大器202的负极输入端连接至PFC开关器件T发射极与采样电阻RCS之间，输入流过PFC开关器件T的电流信号，第二误差放大器202的正极输入端接入乘法器208输出的乘法计算结果，第二误差放大器202的正极输入端还接有保护电阻RM，保护电阻RM接地；PWM比较器204，PWM比较器204的正极端接入来自振荡器OSC的三角波信号，PWM比较器204的负极端连接至第二误差放大器202的输出端，PWM比较器204的输出端连接至PFC开关器件T的栅极端，用于输出PWM信号以调节PFC开关器件T的导通和截止。As shown in Figure 2, in any of the above technical solutions, preferably, the PFC control unit 110 includes: a first error amplifier 206, the negative input terminal of the first error amplifier 206 is connected to the first sampling terminal A, the first error amplifier The positive input terminal of 206 is connected to the reference voltage VREF , which is used to output the voltage error signal between the sampling voltage of the first sampling terminal A and the reference voltage; the multiplier 208, the first input terminal of the multiplier 208 is connected to the first error The output terminal of the amplifier 206 is used to obtain the voltage error signal, the second input terminal of the multiplier 208 is connected to the rectified voltage signal output by the rectifier circuit 102 through the resistance RIAC , and the multiplier 208 generates the product of the voltage error signal and the rectified voltage signal; The second error amplifier 202, the negative input terminal of the second error amplifier 202 is connected between the emitter of the PFC switching device T and the sampling resistor RCS , the current signal flowing through the PFC switching device T is input, the positive input of the second error amplifier 202 terminal access multiplier 208 output multiplication results, the positive input terminal of the second error amplifier 202 is also connected with protection resistor RM , protection resistor RM is grounded; PWM comparator 204, the positive terminal of PWM comparator 204 access from For the triangular wave signal of the oscillator OSC, the negative terminal of the PWM comparator 204 is connected to the output terminal of the second error amplifier 202, and the output terminal of the PWM comparator 204 is connected to the gate terminal of the PFC switching device T for outputting the PWM signal to adjust the PFC The switching device T is turned on and off.
图3示出了根据本发明的一个实施例的空调器的电机驱动电路的示意图。Fig. 3 shows a schematic diagram of a motor driving circuit of an air conditioner according to an embodiment of the present invention.
如图3所示，根据本发明的一个实施例的空调器的电机驱动电路，连接于交流输入端AC和电机M之间，依次具体包括：整流电路单元302、功率因数校正电路单元304、滤波电路单元306和逆变电路单元308，其中，整流电路单元302包括图1所示的整流电路102，功率因素校正电路单元304包括PFC电路，具体包括图2所示的PFC控制单元110和PFC开关器件T、PFC电感L、升压二极管D(可采用升压快恢复二极管)，滤波电路单元306包括并联和/或串联的多个电解电容(图1所示的电容E1、电容E2和电容E3)，其中，为了提高功率因数校正电路单元304的可靠性，控制将逆变电路单元308对直流母线电压信号的采样信号传输至功率因数校正电路单元304，以降低功率因数校正电路单元304的电压环控制电路中分压电阻的阻值漂移对PFC电压环控制的影响。As shown in Figure 3, the motor drive circuit of the air conditioner according to an embodiment of the present invention is connected between the AC input terminal AC and the motor M, and specifically includes in turn: a rectifying circuit unit 302, a power factor correction circuit unit 304, a filter A circuit unit 306 and an inverter circuit unit 308, wherein the rectification circuit unit 302 includes the rectification circuit 102 shown in FIG. 1 , and the power factor correction circuit unit 304 includes a PFC circuit, specifically including the PFC control unit 110 and the PFC switch shown in FIG. 2 Device T, PFC inductor L, boost diode D (boost fast recovery diode can be used), filter circuit unit 306 includes a plurality of electrolytic capacitors connected in parallel and/or in series (capacitor E1, capacitor E2 and capacitor E3 shown in FIG. 1 ), wherein, in order to improve the reliability of the power factor correction circuit unit 304, control the transmission of the sampling signal of the DC bus voltage signal by the inverter circuit unit 308 to the power factor correction circuit unit 304, so as to reduce the voltage of the power factor correction circuit unit 304 The effect of the resistance drift of the voltage divider resistor in the loop control circuit on the PFC voltage loop control.
以上结合附图详细说明了本发明的技术方案，本发明提出了一种变频控制电路和空调器，通过比较逆变电路单元的直流母线采样电压与预设电压的大小关系，降低功率因数校正电路单元的电压环控制电路中分压电阻的阻值漂移对PFC电压环控制的影响，提高了变频控制电路的可靠性，也进一步地提高了空调器的可靠性。The technical scheme of the present invention has been described in detail above in conjunction with the accompanying drawings. The present invention proposes a frequency conversion control circuit and an air conditioner. By comparing the relationship between the DC bus sampling voltage of the inverter circuit unit and the preset voltage, the power factor correction circuit can be reduced. The influence of the resistance drift of the voltage dividing resistor in the voltage loop control circuit of the unit on the PFC voltage loop control improves the reliability of the frequency conversion control circuit and further improves the reliability of the air conditioner.
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711390673.2ACN107990505A (en) | 2017-12-21 | 2017-12-21 | Frequency conversion control circuit and air conditioner |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711390673.2ACN107990505A (en) | 2017-12-21 | 2017-12-21 | Frequency conversion control circuit and air conditioner |
| Publication Number | Publication Date |
|---|---|
| CN107990505Atrue CN107990505A (en) | 2018-05-04 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711390673.2APendingCN107990505A (en) | 2017-12-21 | 2017-12-21 | Frequency conversion control circuit and air conditioner |
| Country | Link |
|---|---|
| CN (1) | CN107990505A (en) |
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| CN114117976A (en)* | 2021-11-26 | 2022-03-01 | 合肥美的暖通设备有限公司 | Air conditioner and its input parameter estimation method, circuit and storage medium |
| CN114953905A (en)* | 2022-02-24 | 2022-08-30 | 珠海格力电器股份有限公司 | Control device and control method for vehicle air conditioner |
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| RJ01 | Rejection of invention patent application after publication | Application publication date:20180504 | |
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