Heat pump control apparatus and heat pump system

Abstract

The utility model provides heat pump control equipment and a heat pump system. The heat pump control equipment comprises a controller, a signal isolation circuit, a driving voltage generation circuit, a filter circuit and an amplification circuit, the controller outputs a PWM signal; the signal isolation circuit is electrically connected to the controller, and the signal isolation circuit carries out isolation processing on the PWM signal so as to output the isolated PWM signal; the driving voltage generation circuit is electrically connected between the signal isolation circuit and the filter circuit, and the driving voltage generation circuit generates PWM driving voltage to the filter circuit according to the isolated PWM signal; the filter circuit processes the PWM driving voltage to obtain a first analog signal with a preset voltage range; the amplifying circuit amplifies the first analog signal according to a preset coefficient and then outputs a second analog signal with a target voltage range to the heat pump. According to the heat pump control equipment, the power percentage of the heat pump can be adjusted with high precision, and therefore the product competitiveness can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of signal processing, in particular to a heat pump control device and a heat pump system. BACKGROUND

[0002] The photovoltaic power generation device can convert solar energy into electric energy. The photovoltaic power generation device can provide the photovoltaic residual power to the heat pump to drive the heat pump to work. The heat pump control device is responsible for communication with the heat pump and the inverter of the photovoltaic power generation device, and changes the working mode of the heat pump according to the photovoltaic residual power provided by the inverter, so as to improve the utilization rate of photovoltaic power and realize efficient and comprehensive utilization of energy.

[0003] At present, the working power of the heat pump needs to be adjusted by inputting an analog signal of 0~10V through the heat pump control device, and different analog voltage values correspond to different working powers of the heat pump. Therefore, how to design a circuit for outputting a high-precision 0~10V isolated analog signal is a technical problem to be solved. CONTENT OF THE INVENTION

[0004] In view of the above, the present application provides a heat pump control device and a heat pump system, which can control the analog signal output with high precision and have a simple structure.

[0005] The first aspect of the present application provides a heat pump control device electrically connected to a heat pump, comprising a controller, a signal isolation circuit, a driving voltage generation circuit, a filter circuit and an amplification circuit; the controller is electrically connected to the signal isolation circuit, and the controller is used to output a PWM signal; the signal isolation circuit is electrically connected to the controller, and the signal isolation circuit is used to isolate and process the PWM signal to output an isolated PWM signal; the driving voltage generation circuit is electrically connected between the signal isolation circuit and the filter circuit, and the driving voltage generation circuit is used to generate a PWM driving voltage for the filter circuit according to the isolated PWM signal; the filter circuit is used to process the PWM driving voltage to obtain a first analog signal with a preset voltage range; the amplification circuit is electrically connected to the filter circuit, and the amplification circuit is used to amplify the first analog signal by a preset coefficient to output a second analog signal with a target voltage range to the heat pump.

[0006] The heat pump control device of the present application outputs the PWM signal through the controller, and processes the PWM signal through the signal isolation circuit, the driving voltage generation circuit, the filter circuit and the amplification circuit to obtain the analog signal with the target voltage range, so that the power percentage of the heat pump can be adjusted with high precision, thereby improving the product competitiveness.

[0007] As an optional implementation, the controller includes a signal output terminal; the signal isolation circuit includes an optocoupler and a first switching transistor, the optocoupler including a light-emitting diode and a phototransistor; the first terminal of the first switching transistor is electrically connected to the signal output terminal of the controller to receive the PWM signal output by the signal output terminal, the second terminal of the first switching transistor is connected to a first ground terminal, the third terminal of the first switching transistor is electrically connected to the cathode of the light-emitting diode, the anode of the light-emitting diode is electrically connected to a first power supply, the emitter of the phototransistor is connected to a second ground terminal, the collector of the phototransistor is electrically connected to a second power supply, and the emitter of the phototransistor is also electrically connected to a drive voltage generation circuit.

[0008] As an optional implementation, the signal isolation circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, and a second capacitor. The first terminal of the first switching transistor is electrically connected to the signal output terminal of the controller through the first resistor. The first terminal of the first switching transistor is also connected to the first ground terminal through the second resistor. The first terminal of the first switching transistor is also connected to the first ground terminal through the first capacitor. The second terminal of the first switching transistor is connected to the first ground terminal. The third terminal of the first switching transistor is electrically connected to the cathode of the light-emitting diode (LED). The anode of the LED is electrically connected to the first power supply through the third resistor. The emitter of the phototransistor is connected to the second ground terminal. The collector of the phototransistor is electrically connected to the second power supply through the fourth resistor. The collector of the phototransistor is also electrically connected to the driving voltage generation circuit through the fifth resistor. The emitter of the phototransistor is electrically connected to the first terminal of the second capacitor and the first terminal of the sixth resistor. The collector of the phototransistor is also electrically connected to the second terminal of the second capacitor and the second terminal of the sixth resistor through the fifth resistor.

[0009] As an optional implementation, the driving voltage generating circuit includes a second switching transistor; the first terminal of the second switching transistor is electrically connected to the collector of the phototransistor and the second power supply, the second terminal of the second switching transistor is connected to the second ground terminal, the third terminal of the second switching transistor is electrically connected to the second power supply, and the third terminal of the second switching transistor is electrically connected to the input terminal of the filter circuit.

[0010] As an optional implementation, the driving voltage generation circuit also includes a seventh resistor and an eighth resistor; the first terminal of the second switch is electrically connected to the collector of the phototransistor and the second power supply, the second terminal of the second switch is electrically connected to the second ground terminal, the third terminal of the second switch is connected to the second power supply through the seventh resistor, and the third terminal of the second switch is also electrically connected to the filter circuit through the eighth resistor.

[0011] As an optional implementation, the filter circuit includes a ninth resistor, a tenth resistor, an eleventh resistor, a third capacitor, and a fourth capacitor; the first terminal of the third capacitor is electrically connected to the third terminal of the second switching transistor through an eighth resistor, the first terminal of the third capacitor is also electrically connected to the first terminal of the ninth resistor, the second terminal of the third capacitor is electrically connected to the second ground terminal, the first terminal of the fourth capacitor is electrically connected to the second terminal of the ninth resistor, the first terminal of the fourth capacitor is also electrically connected to the first input terminal of the amplifier circuit through a tenth resistor, the second terminal of the fourth capacitor is electrically connected to the second ground terminal, the first terminal of the eleventh resistor is electrically connected to the connection point between the tenth resistor and the first input terminal of the amplifier circuit, and the second terminal of the eleventh resistor is electrically connected to the second ground terminal.

[0012] As an optional implementation, the amplifier circuit includes an amplifier, the positive input terminal of which is electrically connected to the output terminal of the filter circuit, the negative input terminal of which is electrically connected to the second ground terminal, and the output terminal of which is electrically connected to the input terminal of the heat pump.

[0013] As an optional implementation, during the first time period of the switching cycle, the controller outputs a PWM signal with a first level state to control the first switch to turn on, so that the light-emitting diode of the optocoupler emits light and the phototransistor of the optocoupler turns on, so that the second switch is turned off, and the drive voltage generation circuit outputs a high level of PWM drive voltage to the filter circuit; during the second time period of the switching cycle, the controller outputs a PWM signal with a second level state to control the first switch to turn off, the light-emitting diode of the optocoupler does not emit light, the phototransistor of the optocoupler is turned off, the second power supply outputs a voltage signal to control the second switch to turn on, and the drive voltage generation circuit outputs a low level of PWM drive voltage to the filter circuit.

[0014] As an optional implementation, the heat pump control device further includes a first power isolation module and a second power isolation module; the first power supply is electrically connected to the first power isolation module, and the first power supply is isolated by the first power isolation module to obtain the second power supply; the fourth power supply is electrically connected to the second power isolation module, and the fourth power supply is isolated by the second power isolation module to obtain the third power supply, which is used to power the amplifier circuit.

[0015] As an optional implementation, the first grounding terminal is electrically connected to the first power isolation module, and the first grounding terminal is isolated by the first power isolation module to obtain the second grounding terminal.

[0016] A second aspect of this application also provides a heat pump system, comprising: a heat pump and a heat pump control device as described above, the heat pump control device being electrically connected to the heat pump and used to control the operating power of the heat pump.

[0017] It should be understood that the heat pump systems described in the second aspect above correspond to the heat pump control devices described in the first aspect above. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects of the corresponding heat pump control devices provided above, and will not be repeated here. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an application scenario diagram of a heat pump system provided in an embodiment of this application.

[0020] Figure 2 This is a schematic diagram of a heat pump control device provided in an embodiment of this application.

[0021] Figure 3 This is a circuit diagram of a heat pump control device provided in an embodiment of this application.

[0022] Figure 4 This is a schematic diagram of how the first power isolation module isolates the system power supply and system ground.

[0023] Figure 5 This is a schematic diagram of how the second power isolation module isolates the system power supply and system ground.

[0024] Figure 6 This is a schematic diagram of a voltage conversion circuit converting a fourth power source into a first power source. Detailed Implementation

[0025] In the embodiments of this application, terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or order. For example, "first application" and "second application" are used to distinguish different applications, not to describe a specific order of applications. Features specified as "first" or "second" may explicitly or implicitly include one or more of those features.

[0026] Typically, photovoltaic (PV) power generation equipment converts solar energy into electrical energy. The surplus power from the PV system can then be supplied to a heat pump to drive it. The heat pump control device communicates with both the heat pump and the inverter of the PV system, adjusting the heat pump's operating mode based on the surplus PV power supplied by the inverter. This increases the PV power output of the heat pump. The heat pump's operating power needs to be regulated by inputting a 0-10V analog signal to the control device, with different analog voltage values ​​corresponding to different heat pump operating power. Therefore, designing a circuit that outputs a high-precision 0-10V isolated analog signal is a crucial technical problem that needs to be solved.

[0027] Therefore, this application provides a heat pump control device and a heat pump system that can control the output of analog signals with high precision and has a simple structure.

[0028] Please see Figure 1 This is an application scenario diagram of a heat pump system 300 provided in one embodiment of this application.

[0029] like Figure 1 As shown, the heat pump system 300 in this embodiment includes a heat pump control device 100 and a heat pump 200, with the heat pump control device 100 electrically connected to the heat pump 200. The heat pump control device 100 is also electrically connected between the heat pump 200 and the photovoltaic power generation device 400. In some more specific implementations, the heat pump control device 100 is electrically connected between the heat pump 200 and the inverter 410 of the photovoltaic power generation device 400. The heat pump control device 100 and the inverter 410 communicate via a communication bus. The heat pump control device 100 obtains the remaining photovoltaic power of the photovoltaic power generation device 400 and can output a corresponding analog signal to the heat pump 200 based on the remaining photovoltaic power, thereby controlling the operating power of the heat pump 200.

[0030] It is understood that, in some alternative implementations, the heat pump control device 100 of this application embodiment can change the operating power of the heat pump 200 by outputting an analog signal of 0~10V to the heat pump 200.

[0031] Please see Figure 2 This is a schematic diagram of a PWM signal to analog signal conversion circuit provided in one embodiment of this application.

[0032] The heat pump control device 100 includes a signal processing circuit 10 and a controller 20. The signal processing circuit 10 is electrically connected between the controller 20 and the heat pump 200.

[0033] In this embodiment, the heat pump control device 100 can communicate with the photovoltaic power generation device 400 via a communication bus. The controller 20 can obtain the remaining photovoltaic power of the photovoltaic power generation device 400, and the controller 20 can output a corresponding pulse width modulation (PWM) signal to the signal processing circuit 10 according to the remaining photovoltaic power of the photovoltaic power generation device 400. The signal processing circuit 10 can process the PWM signal to generate an analog signal with a target voltage range, and output the analog signal with the target voltage range to the heat pump 200 to enable the heat pump 200 to operate. It can be understood that, in one possible example, the controller 20 can be a microcontroller unit (MCU).

[0034] The signal processing circuit 10 may include a signal isolation circuit 12, a drive voltage generation circuit 14, a filter circuit 16, and an amplifier circuit 18.

[0035] The signal isolation circuit 12 is electrically connected to the signal output terminal of the controller 20, the drive voltage generating circuit 14 is electrically connected between the signal isolation circuit 12 and the filter circuit 16, and the amplifier circuit 18 is electrically connected between the filter circuit 16 and the signal input terminal of the heat pump 200.

[0036] The signal output terminal of controller 20 can be used to output PWM signals.

[0037] The signal isolation circuit 12 can receive the PWM signal. After the PWM signal is isolated by the signal isolation circuit 12, it is output to the drive voltage generation circuit 14. Based on this design, this application can avoid interference between the input PWM signal and the output analog signal.

[0038] Next, the drive voltage generation circuit 14 receives the PWM signal after signal isolation, generates a PWM drive voltage, and outputs a synchronous PWM drive voltage to the filter circuit 16. The filter circuit 16 filters the PWM drive voltage (e.g., second-order RC filtering) to obtain a first analog signal with a preset voltage range, and outputs the first analog signal with the preset voltage range to the amplifier circuit 18. The amplifier circuit 18 amplifies the first analog signal with the preset voltage range by a preset coefficient to obtain a second analog signal with a target voltage range. The amplifier circuit 18 outputs the second analog signal with the target voltage range to the heat pump 200 to enable the heat pump 200 to operate.

[0039] Please see Figure 3 The circuit diagram is provided for a heat pump control device 100 according to an embodiment of this application.

[0040] like Figure 3As shown, the signal isolation circuit 12 may include an optocoupler U1, a first switch Q1, resistors R1, R2, R3, R4, R5, and R6, and capacitors C1 and C2. The drive voltage generation circuit 14 may include a second switch Q2, resistors R7 and R8.

[0041] The optocoupler U1 includes a light-emitting diode and a phototransistor. The first switching transistor Q1 includes a first terminal, a second terminal, and a third terminal.

[0042] The first terminal of the first switch Q1 is electrically connected to the signal output terminal O1 of the controller 20 through resistor R1. The first terminal of the first switch Q1 is also electrically connected to the first terminal of resistor R2 and the first terminal of capacitor C1. The second terminal of resistor R2 is connected to the first ground terminal GND1, and the second terminal of capacitor C1 is also electrically connected to the second terminal of resistor R2, the second terminal of capacitor C1, and the first ground terminal GND1. The third terminal of the first switch Q1 is electrically connected to the cathode of the light-emitting diode of the optocoupler U1.

[0043] The first terminal of the first switching transistor Q1 can be used as the control terminal of the first switching transistor Q1. That is, the signal output terminal O1 of the controller 20 outputs a PWM signal to the control terminal of the first switching transistor Q1 to control the first switching transistor Q1 to turn on or off.

[0044] The anode of the light-emitting diode of optocoupler U1 is electrically connected to the first power supply V1 through resistor R3. The collector of the phototransistor of optocoupler U1 is electrically connected to the second power supply V2 through resistor R4. The collector of the phototransistor of optocoupler U1 is electrically connected to the first terminal of the driving voltage generation circuit 14, resistor R6, and capacitor C2 through resistor R5. The emitter of the phototransistor of optocoupler U1 is connected to the second ground terminal GND2. The emitter of the phototransistor of optocoupler U1 is electrically connected to the second terminal of resistor R6 and capacitor C2.

[0045] In some alternative implementations, the first switch Q1 can be any one of a metal-oxide-semiconductor field-effect transistor (MOSFET), an insulated-gate bipolar transistor (IGBT), a bipolar power transistor, or a wide-bandgap semiconductor field-effect transistor.

[0046] The first terminal of the second switch Q2 is electrically connected to the collector of the phototransistor of the optocoupler U1 through resistor R5. The second terminal of the second switch Q2 is electrically connected to the second ground terminal GND2. The third terminal of the second switch Q2 is electrically connected to the second power supply V2 through resistor R7. The third terminal of the second switch Q2 is also electrically connected to the filter circuit 16 through resistor R8.

[0047] The first terminal of the second switch Q2 can be used as the control terminal of the second switch Q2. That is, the PWM signal output by the optocoupler U1 is sent to the control terminal of the second switch Q2, which can control the second switch Q2 to be turned on or off.

[0048] In some alternative implementations, the second switch Q2 can be any one of a metal-oxide-semiconductor field-effect transistor (MOSFET), an insulated-gate bipolar transistor (IGBT), a bipolar power transistor, or a wide-bandgap semiconductor field-effect transistor.

[0049] It is understood that in this application, the optocoupler U1 can be a device with a 5kV insulation withstand voltage, which can protect the controller 20.

[0050] The filter circuit 16 may include resistors R9, R10, and R11, capacitor C3, and capacitor C4. The amplifier circuit 18 may include amplifier U2, resistors R12, R13, and R14.

[0051] The first terminal of capacitor C3 is electrically connected to the third terminal of the second switching transistor Q2 through resistor R8. The first terminal of capacitor C3 is also electrically connected to the first terminal of resistor R9. The second terminal of capacitor C3 is electrically connected to the second ground terminal GND2. The first terminal of capacitor C4 is electrically connected to the second terminal of resistor R9. The first terminal of capacitor C4 is also electrically connected to the non-inverting input terminal of amplifier U2 through resistor R10. The second terminal of capacitor C4 is electrically connected to the second ground terminal GND2. The first terminal of resistor R11 is electrically connected to the connection point between resistor R10 and the non-inverting input terminal of amplifier U2. The second terminal of resistor R11 is electrically connected to the second ground terminal GND2.

[0052] The negative input terminal of amplifier U2 is electrically connected to the second ground terminal GND2 through resistor R12, the positive input terminal of amplifier U2 is electrically connected to the output terminal of amplifier U2 through resistor R13, the power supply terminal of amplifier U2 is electrically connected to the third power supply V3, the ground terminal of amplifier U2 is connected to the second ground terminal GND2, and the output terminal of amplifier U2 is electrically connected to the signal input terminal of heat pump 200 through resistor R14, so as to output an analog voltage signal with a target voltage range to the signal input terminal of heat pump 200.

[0053] It can be understood that the first power supply V1 is the system power supply, and the first ground terminal GND1 is the system ground. The second power supply V2 is the isolation power supply, and the second ground terminal GND2 is the isolation ground. The system power supply and system ground can be separated into isolated power supply and isolated ground respectively through the power isolation module.

[0054] like Figure 4 As shown, the first power supply V1 and the first ground terminal GND1 are both electrically connected to the first power isolation module 30. After the first power supply V1 and the first ground terminal GND1 are isolated by the first power isolation module 30, the isolated second power supply V2 and the isolated second ground terminal GND2 are obtained respectively.

[0055] As an example of this application, a first power supply V1 is used to output a 3.3V voltage. A second power supply V2 is also used to output a 3.3V voltage.

[0056] Among them, the third power supply V3 is an isolated power supply, and the fourth power supply V4 is the system power supply.

[0057] like Figure 5 As shown, the fourth power supply V4 and the first ground terminal GND1 are both electrically connected to the second power supply isolation module 40. After the fourth power supply V4 and the first ground terminal GND1 are isolated by the second power supply isolation module 40, the isolated third power supply V3 and the isolated second ground terminal GND2 are obtained.

[0058] As an example of this application, the third power supply V3 is used to output a 12V voltage. The fourth power supply V4 is used to output a 12V voltage.

[0059] It is understood that in this application, the fourth power supply V4 can be converted into the first power supply V1 via a voltage conversion circuit. For example... Figure 6 As shown, the input terminal of the power conversion circuit 50 is electrically connected to the fourth power supply V4, and the output terminal of the power conversion circuit 50 can output the first power supply V1. As a possible example, the power conversion circuit 50 can be a DC-DC voltage conversion circuit. Specifically, the power conversion circuit 50 can convert the 12V DC voltage output from the fourth power supply V4 into a 3.3V DC voltage.

[0060] The following will combineFigure 3 The embodiments shown in the present application detail the working principle of the heat pump control device 100.

[0061] When the heat pump control device 100 is working, at a certain moment, the signal output terminal O1 of the controller 20 outputs a PWM signal with a first duty cycle.

[0062] Assuming a switching cycle of T, during the time period T1 of the switching cycle, the PWM signal controls the first switch Q1 to turn on, causing the LED of the optocoupler U1 to emit light. The phototransistor of the optocoupler U1 is also turned on. Since the phototransistor and the LED of the optocoupler U1 maintain the same frequency for turning on and off, the signal output by the optocoupler U1 is also a PWM signal. Furthermore, the duty cycle of the PWM signal output by the optocoupler U1 is the same as the duty cycle of the PWM signal output by the controller 20. At this time, the second switch Q2 is turned off, so the second power supply V2 can output voltage to the filter circuit 16. That is, the high level of the PWM drive voltage output by the drive voltage generation circuit 14 is given to the filter circuit 16. The filter circuit 16 performs second-order RC filtering on the voltage (during this stage, the second power supply V2 will charge the capacitor in the filter circuit 16) to obtain a first analog signal with a preset voltage range. The first analog signal with a preset voltage range is then output to the amplifier U2. The amplifier U2 can amplify the first analog signal with a preset voltage range by a preset coefficient to obtain a second analog signal with a target voltage range. Among them, the analog output voltage V of amplifier circuit 18 o The following formula (1) can be satisfied:

[0063] V o =A1×V1×D1(1)

[0064] Where A1 is the preset coefficient for amplifier U2 to amplify the first analog signal, V1 is the voltage output by the second power supply V2, and D1 is the duty cycle of the PWM signal output by the signal output terminal O1 of controller 20. The duty cycle range of the PWM signal output by controller 20 can be 0~100%.

[0065] As can be seen from the above formula (1), the controller 20 can precisely adjust the working power of the heat pump 200 by adjusting the duty cycle of the output PWM signal.

[0066] For example, the second power supply V2 outputs a voltage of 3.3V. The amplifier circuit 18 receives a first analog signal of 0-3.3V output from the filter circuit 16. This first analog signal has a preset coefficient of three times its value. That is, the first analog signal output by the filter circuit 16 is amplified three times by the amplifier U2 to obtain a second analog signal of 0-9.9V, thus meeting the interaction requirements between the heat pump control device 100 and the heat pump 200. Therefore, during the T1 time period of the switching cycle, the heat pump control device 100 outputs a second analog signal with a target voltage range to the heat pump 200, enabling the heat pump 200 to operate.

[0067] During the switching cycle time T2, the PWM signal controls the first switch Q1 to turn off, the LED of optocoupler U1 does not emit light, the phototransistor of optocoupler U1 is turned off, and the voltage signal output by the second power supply V2 controls the second switch Q2 to turn on. The voltage of the second power supply V2 will not be output to the filter circuit 16, that is, the drive voltage generation circuit 14 outputs a low level of PWM drive voltage to the filter circuit 16. At this time, capacitors C3 and C4 in the filter circuit 16 will be in a discharging state, that is, the filter circuit 16 can still output the first analog signal to the amplifier circuit 18, so that the amplifier circuit 18 can output a second analog signal with the target voltage range to the heat pump 200. In other words, during the switching cycle time T2, the heat pump control device 100 still outputs a second analog signal with the target voltage range to the heat pump 200, so that the heat pump 200 works.

[0068] The time period T1 and the time period T2 constitute a switching cycle.

[0069] Based on the above embodiments, the heat pump control device 100 of this application outputs a PWM signal through the controller 20 and performs signal processing on the PWM signal through the signal processing circuit 10 to obtain a 0-10V analog signal, thereby enabling high-precision adjustment of the power percentage of the heat pump 200, which can enhance product competitiveness.

[0070] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application should fall within the scope of protection claimed by this application.

Claims

1. A heat pump control device electrically connected to a heat pump, characterized by, The heat pump control device comprises a controller, a signal isolation circuit, a driving voltage generation circuit, a filter circuit and an amplification circuit; The controller is electrically connected to the signal isolation circuit, and the controller is configured to output a PWM signal; The signal isolation circuit is electrically connected to the controller, and the signal isolation circuit is configured to perform isolation processing on the PWM signal to output an isolated PWM signal; The driving voltage generation circuit is electrically connected between the signal isolation circuit and the filter circuit, and the driving voltage generation circuit is configured to generate a PWM driving voltage according to the isolated PWM signal for the filter circuit; The filter circuit is configured to process the PWM driving voltage to obtain a first analog signal with a preset voltage range; The amplification circuit is electrically connected to the filter circuit, and the amplification circuit is configured to amplify the first analog signal by a preset coefficient to output a second analog signal with a target voltage range to the heat pump.

2. The heat pump control device according to claim 1, wherein The controller comprises a signal output end; The signal isolation circuit comprises an optoelectronic coupler and a first switch tube, the optoelectronic coupler comprises a light emitting diode and a photosensitive triode; The first end of the first switch tube is electrically connected to the signal output end of the controller to receive the PWM signal output by the signal output end, the second end of the first switch tube is connected to a first ground end, the third end of the first switch tube is electrically connected to the cathode of the light emitting diode, the anode of the light emitting diode is electrically connected to a first power supply, the emitter of the photosensitive triode is connected to a second ground end, the collector of the photosensitive triode is electrically connected to a second power supply, and the emitter of the photosensitive triode is also electrically connected to the driving voltage generation circuit.

3. The heat pump control device according to claim 2, wherein The signal isolation circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor and a second capacitor, the first end of the first switch tube is electrically connected to the signal output end of the controller through the first resistor, the first end of the first switch tube is also connected to the first ground end through the second resistor, the first end of the first switch tube is also connected to the first ground end through the first capacitor, the second end of the first switch tube is connected to the first ground end, the third end of the first switch tube is electrically connected to the cathode of the light emitting diode, the anode of the light emitting diode is electrically connected to the first power supply through the third resistor, the emitter of the photosensitive triode is connected to the second ground end, the collector of the photosensitive triode is electrically connected to the second power supply through the fourth resistor, the collector of the photosensitive triode is also electrically connected to the driving voltage generation circuit through the fifth resistor, the emitter of the photosensitive triode is electrically connected to the first end of the second capacitor and the first end of the sixth resistor, and the collector of the photosensitive triode is also electrically connected to the second end of the second capacitor and the second end of the sixth resistor through the fifth resistor.

4. The heat pump control device according to claim 2, wherein the driving voltage generating circuit comprises a second switch tube; a first end of the second switch tube is electrically connected to the collector of the photoelectric coupler and the second power supply, a second end of the second switch tube is connected to the second ground terminal, a third end of the second switch tube is electrically connected to the second power supply, and the third end of the second switch tube is electrically connected to an input terminal of the filter circuit.

5. The heat pump control device according to claim 4, wherein the driving voltage generating circuit further comprises a seventh resistor and an eighth resistor; the first end of the second switch tube is electrically connected to the collector of the photoelectric coupler and the second power supply, the second end of the second switch tube is electrically connected to the second ground terminal, the third end of the second switch tube is connected to the second power supply through the seventh resistor, and the third end of the second switch tube is further electrically connected to the filter circuit through the eighth resistor.

6. The heat pump control device according to claim 5, wherein the filter circuit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a third capacitor and a fourth capacitor; a first end of the third capacitor is electrically connected to the third end of the second switch tube through the eighth resistor, the first end of the third capacitor is further electrically connected to a first end of the ninth resistor, a second end of the third capacitor is connected to the second ground terminal, a first end of the fourth capacitor is electrically connected to a second end of the ninth resistor, the first end of the fourth capacitor is further electrically connected to a first input terminal of the amplifying circuit through the tenth resistor, a second end of the fourth capacitor is electrically connected to the second ground terminal, a first end of the eleventh resistor is electrically connected to a connection point between the tenth resistor and the first input terminal of the amplifying circuit, and a second end of the eleventh resistor is electrically connected to the second ground terminal.

7. The heat pump control device according to claim 2, wherein the amplifying circuit comprises an amplifier, a positive phase input terminal of the amplifier is electrically connected to an output terminal of the filter circuit, a negative phase input terminal of the amplifier is electrically connected to the second ground terminal, and an output terminal of the amplifier is electrically connected to an input terminal of the heat pump.

8. The heat pump control device according to claim 4, wherein in a first time period of a switching cycle, the controller is configured to output a PWM signal with a first level state to control the first switch tube to be turned on, so that a light emitting diode of the photoelectric coupler emits light, and a photoelectric coupler of the photoelectric coupler is turned on, so that the second switch tube is turned off, and the driving voltage generating circuit outputs a high level of the PWM driving voltage to the filter circuit. ​ ​ ​ ​ ​ ​ In the second time period of the switching cycle, the controller is configured to output a PWM signal with a second level state to control the first switch to be off, the light emitting diode of the optocoupler is not emitting light, the light sensitive triode of the optocoupler is off, the second power output voltage signal is used to control the second switch to be on, and the drive voltage generating circuit outputs a low level of the PWM drive voltage to the filter circuit.

9. The heat pump control device according to claim 2, characterized by The heat pump control device further comprises a first power isolation module and a second power isolation module. The first power source is electrically connected to the first power isolation module, and the first power source is isolated by the first power isolation module to obtain the second power source. The fourth power source is electrically connected to the second power isolation module, and the fourth power source is isolated by the second power isolation module to obtain a third power source, and the third power source is used to supply power to the amplification circuit.

10. The heat pump control device according to claim 9, wherein the first ground terminal is electrically connected to the first power isolation module, and the first ground terminal is isolated by the first power isolation module to obtain the second ground terminal. The heat pump control device further comprises a first power isolation module and a second power isolation module.

11. A heat pump system, characterized by The heat pump and the heat pump control device according to any one of claims 1 to 10 are electrically connected to the heat pump, and the heat pump control device is used to control the working power of the heat pump. ​

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