Heat pump control apparatus and heat pump system

Abstract

The invention provides heat pump control equipment and a heat pump system. The heat pump control equipment comprises a controller, a first isolating circuit, a first amplifying circuit and a self-feedback circuit, the controller is configured to output a first analog signal with a preset voltage range; the first isolation circuit is electrically connected to the controller, and the first isolation circuit is configured to perform isolation processing on the first analog signal so as to output a first differential signal to the first amplification circuit; the first amplifying circuit is electrically connected between the first isolating circuit and the signal input end of the heat pump, and the first amplifying circuit is configured to amplify the first differential signal according to a first preset coefficient and then output a second analog signal with a target voltage range to the heat pump. The self-feedback circuit is configured to collect a second analog signal, process the second analog signal and feed back a third analog signal to the controller. The heat pump control equipment can control analog signal output in a high-precision mode and control the working power of the heat pump in a high-precision mode, and is simple in structure.

Description

Technical Field

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

[0002] Photovoltaic power generation equipment can convert solar energy into electrical energy, and photovoltaic power generation equipment can provide photovoltaic surplus power to heat pumps to drive the heat pumps. Among them, the heat pump control device is responsible for communicating with the heat pump and the inverter of the photovoltaic power generation equipment, and changing the working mode of the heat pump according to the photovoltaic surplus power provided by the inverter, thereby improving the photovoltaic power utilization rate and realizing efficient and comprehensive utilization of energy.

[0003] At present, the working power of the heat pump needs to be adjusted by inputting a 0~10V analog signal 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 that outputs a high-precision 0~10V isolated analog signal is a technical problem that needs to be solved urgently. Summary 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] A first aspect of the present application provides a heat pump control device electrically connected to a heat pump, the heat pump control device comprising: a controller, a first isolation circuit, a first amplification circuit and a self-feedback circuit; The controller is configured to output a first analog signal having a preset voltage range; A first isolation circuit is electrically connected to the controller, and the first isolation circuit is configured to perform isolation processing on the first analog signal to output a first differential signal to a first amplification circuit; The first amplifier circuit is electrically connected between the first isolation circuit and the signal input terminal of the heat pump, and the first amplifier circuit is configured to amplify the first differential signal with a first preset coefficient and output a second analog signal with a target voltage range to the heat pump; The self-feedback circuit is electrically connected between the output end of the first amplifying circuit and the controller. The self-feedback circuit is configured to collect the second analog signal, process the second analog signal, and then feed back a third analog signal to the controller.

[0006] The heat pump control device of the present application outputs a first analog signal with a preset voltage range through the signal pin of the controller, and obtains a second analog signal with a target voltage range after isolation processing and differential amplification, so as to control the output of the analog signal with high precision, thereby adjusting the power percentage of the heat pump with high precision. In addition, the present application can also collect the output second analog signal and calculate the error between the voltage value of the output analog signal and the set value, and when the error is less than or equal to the threshold, it is determined to meet the design requirements.

[0007] As an optional implementation, the self-feedback circuit includes: a second isolation circuit and a second amplification circuit, the second isolation circuit being electrically connected between the first amplification circuit and the second amplification circuit; The second isolation circuit is configured to obtain the second analog signal output by the first amplification circuit, isolate the second analog signal, and then output a second differential signal to the second amplification circuit; The second amplifier circuit is electrically connected between the second isolation circuit and the controller. The second amplifier circuit is configured to amplify the second differential signal with a second preset coefficient and then output a third analog signal to the controller.

[0008] As an optional implementation, the controller is configured as follows: Determine an error value between a voltage value of the second analog signal and a set voltage value; If the error value is greater than the preset threshold, the control alarm module outputs a warning message.

[0009] As an optional implementation, the controller includes a first signal pin, the first signal pin is electrically connected to the first isolation circuit, and the first signal pin is configured to output a first analog signal with a preset voltage range to the first isolation circuit.

[0010] As an optional implementation, the first isolation circuit includes a first isolation chip, and the first isolation chip includes a first power pin, a second power pin, a first ground pin, a second ground pin, a first signal input pin, a first differential signal pin, and a second differential signal pin. The first signal input pin of the first isolation chip is electrically connected to the first signal pin of the controller through a first resistor to receive a first analog signal with a preset voltage range output by the controller, the first signal input pin of the first isolation chip is also connected to the first ground terminal through a first capacitor, the first ground pin of the first isolation chip is connected to the first ground terminal, the first power pin of the first isolation chip is electrically connected to the first power supply through a second resistor, the second power pin of the first isolation chip is electrically connected to the second power supply, the second ground pin of the first isolation chip is connected to the second ground terminal, the first differential signal pin of the first isolation chip is electrically connected to the first amplifier circuit through a third resistor, and the second differential signal pin of the first isolation chip is electrically connected to the first amplifier circuit through a fourth resistor.

[0011] As an optional implementation, the heat pump control device further includes a first power isolation module. The first power supply and the first ground terminal are electrically connected to the first power isolation module, the first power supply is isolated by the first power isolation module to obtain the second power supply, and the first ground terminal is isolated by the first power isolation module to obtain the second ground terminal. The first power supply is the system power supply, the first ground terminal is the system ground, the second power supply is the isolated power supply, and the second ground terminal is the isolated ground.

[0012] As an optional implementation, the first amplification circuit includes a first amplifier, a positive phase input terminal of the first amplifier is electrically connected to the first differential signal pin of the first isolation chip through a third resistor, a positive phase input terminal of the first amplifier is connected to the second ground terminal through a fifth resistor, a negative phase input terminal of the first amplifier is electrically connected to the second differential signal pin of the first isolation chip through a fourth resistor, a power supply terminal of the first amplifier is electrically connected to the third power supply, a ground terminal of the first amplifier is connected to the second ground terminal, an output terminal of the first amplifier is electrically connected to the negative phase input terminal of the first amplifier through a sixth resistor, and an output terminal of the first amplifier is electrically connected to the signal input terminal of the heat pump through a seventh resistor to output a second analog signal with a target voltage range to the heat pump.

[0013] As an optional implementation, the second isolation circuit includes a second isolation chip, and the second isolation chip includes a first power pin, a second power pin, a first ground pin, a second ground pin, a first signal input pin, a first differential signal pin, and a second differential signal pin. The first signal input pin of the second isolation chip is electrically connected to the output end of the first amplifier through an eighth resistor, the first signal input pin of the second isolation chip is also connected to the second ground terminal through a ninth resistor, the first ground pin of the second isolation chip is connected to the first ground terminal, the second ground pin of the second isolation chip is connected to the second ground terminal, the first power pin of the second isolation chip is electrically connected to the first power supply through a tenth resistor, the second power pin of the second isolation chip is electrically connected to the second power supply, the first differential signal pin of the second isolation chip is electrically connected to the second amplifier circuit through an eleventh resistor, and the second differential signal pin of the second isolation chip is electrically connected to the second amplifier circuit through a twelfth resistor.

[0014] As an optional implementation, the second amplification circuit includes a second amplifier, and the controller also includes a second signal pin; the positive phase input terminal of the second amplifier is electrically connected to the first differential signal pin of the second isolation chip through an eleventh resistor, the positive phase input terminal of the second amplifier is also connected to the first ground terminal through a thirteenth resistor, the negative phase input terminal of the second amplifier is electrically connected to the second differential signal pin of the second isolation chip through a twelfth resistor, the power supply terminal of the second amplifier is electrically connected to the fourth power supply, the ground terminal of the second amplifier is connected to the first ground terminal, the output terminal of the second amplifier is electrically connected to the negative phase input terminal of the second amplifier through a fourteenth resistor, the output terminal of the second amplifier is also electrically connected to the second signal pin of the controller through a fifteenth resistor, and the second signal pin of the controller is also connected to the first ground terminal through a second capacitor.

[0015] As an optional implementation, the heat pump control device further includes a second power isolation module; a 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 a third power supply. The fourth power supply is a system power supply, and the third power supply is an isolated power supply.

[0016] The second aspect of the present application further 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 the heat pump control device being used to control the working power of the heat pump.

[0017] It should be understood that the heat pump systems described in the second aspect provided above correspond to the heat pump control devices of the first aspect provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding heat pump control devices provided above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

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

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

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

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

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

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

[0025] In the embodiments of the present application, the words "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. For example, the first application, the second application, etc. are used to distinguish different applications, rather than to describe a specific order of applications. The features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0026] Generally, photovoltaic power generation equipment can convert solar energy into electrical energy, and photovoltaic power generation equipment can provide photovoltaic surplus power to heat pumps to drive the heat pumps to work. Among them, the heat pump control device is responsible for communicating with the heat pump and the inverter of the photovoltaic power generation equipment, and changing the working mode of the heat pump according to the photovoltaic surplus power provided by the inverter, thereby increasing the photovoltaic power utilization. The working power of the heat pump needs to be adjusted by inputting a 0~10V analog signal 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 that outputs a high-precision 0~10V isolated analog signal is a technical problem that needs to be solved urgently.

[0027] To this end, the present application provides a heat pump control device and a heat pump system, which can control the output of analog signals with high precision and have a simple structure.

[0028] See also Figure 1 , which is an application scenario diagram of a heat pump system 300 provided in one embodiment of the present application.

[0029] like Figure 1As shown, the heat pump system 300 in this embodiment includes a heat pump control device 100 and a heat pump 200, and the heat pump control device 100 is electrically connected to the heat pump 200. The heat pump control device 100 is electrically connected between the heat pump 200 and the photovoltaic power generation system 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 system 400. The heat pump control device 100 communicates with the inverter 410 through a communication bus, and the heat pump control device 100 obtains the photovoltaic surplus power of the photovoltaic power generation system 400. The heat pump control device 100 can output a corresponding analog signal to the heat pump 200 according to the photovoltaic surplus power of the photovoltaic power generation system 400, thereby controlling the working power of the heat pump 200.

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

[0031] See also Figure 2 , is a schematic diagram of a heat pump control device 100 provided in one embodiment of the present application. The heat pump control device 100 may include a signal processing circuit 10 and a controller 20. The signal processing circuit 10 is electrically connected to the controller 20.

[0032] The controller 20 is used to output an analog signal with a preset voltage range. The signal processing circuit 10 is used to process the analog signal output by the controller 20 to obtain an analog signal with a target voltage range, and transmit the analog signal to the heat pump 200 to control the working power of the heat pump 200. It can be understood that in a possible example, the controller 20 can be a micro controller unit (MCU).

[0033] The signal processing circuit 10 may include a first isolation circuit 12 , a first amplification circuit 14 , and a self-feedback circuit 15 .

[0034] The first isolation circuit 12 is electrically connected to the first signal pin of the controller 20 , the input end of the first amplifier circuit 14 is electrically connected to the output end of the first isolation circuit 12 , and the output end of the first amplifier circuit 14 is electrically connected to the signal input end of the heat pump 200 .

[0035] The first isolation circuit 12 is used to receive an analog signal with a preset voltage range outputted from a first signal pin of the controller 20 , and to perform signal isolation on the analog signal and then output it to the first amplification circuit 14 .

[0036] The first amplifier circuit 14 is used to amplify the isolated analog signal with a first preset coefficient to obtain 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 work.

[0037] The self-feedback circuit 15 is electrically connected between the output end of the first amplifier circuit 14 and the second signal pin of the controller 20. The self-feedback circuit 15 is used to obtain the analog signal output by the first amplifier circuit 14, and feed the analog signal back to the controller 20 after processing the analog signal.

[0038] In an optional implementation, the self-feedback circuit 15 may include two isolation circuits 16 and a second amplifier circuit 18. The input end of the second isolation circuit 16 is electrically connected to the output end of the first amplifier circuit 14, the output end of the second isolation circuit 16 is electrically connected to the input end of the second amplifier circuit 18, and the output end of the second amplifier circuit 18 is electrically connected to the second signal pin of the controller 20.

[0039] In a specific implementation process, the second isolation circuit 16 can obtain the analog signal output by the first amplifier circuit 14 to the heat pump 200 from the output end of the first amplifier circuit 14, and can output the analog signal to the second amplifier circuit 18 after isolating the analog signal. The second amplifier circuit 18 can be used to amplify the analog signal isolated by the second isolation circuit 16 with a second preset coefficient, and feed the amplified analog signal back to the second signal pin of the controller 20. The second preset coefficient is less than the first preset coefficient. Based on such a design, the analog signal output by the first amplifier circuit 14 is fed back to the controller 20 through the self-feedback circuit 15, and the controller 20 can calculate the error between the analog output voltage and the set value, so as to determine whether the analog output voltage is accurate.

[0040] See also Figure 3 , which is a circuit diagram of a heat pump control device 100 provided in one embodiment of the present application.

[0041] The controller 20 may include a first signal pin DAC and a second signal pin AI.

[0042] The first isolation circuit 12 may include a first isolation chip U1 , a resistor R1 , a resistor R2 , a resistor R3 , a resistor R4 , and a capacitor C1 .

[0043] The first isolation chip U1 may include a first power pin Vcc1, a second power pin Vcc2, a first ground pin G1, a second ground pin G2, a first signal input pin S1, a first differential signal pin O1, and a second differential signal pin O2.

[0044] The first signal input pin S1 of the first isolation chip U1 is electrically connected to the first signal pin DAC of the controller 20 through the resistor R1 to receive the analog voltage signal with a preset voltage range output by the controller 20. The first signal input pin S1 of the first isolation chip U1 is also connected to the first ground terminal GND1 through the capacitor C1. The first ground pin G1 of the first isolation chip U1 is connected to the first ground terminal GND1. The first power pin Vcc1 of the first isolation chip U1 is electrically connected to the first power supply V1 through the resistor R2. The second power pin Vcc2 of the first isolation chip U1 is electrically connected to the second power supply V2. The second ground pin G2 of the first isolation chip U1 is connected to the second ground terminal GND2. The first differential signal pin O1 of the first isolation chip U1 is electrically connected to the first amplifier circuit 14 through the resistor R3. The second differential signal pin O2 of the first isolation chip U1 is electrically connected to the first amplifier circuit 14 through the resistor R4.

[0045] 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 isolated power supply, and the second ground terminal GND2 is the isolated ground. The system power supply and the system ground can be obtained through the power isolation module to obtain the isolated power supply and the isolated ground respectively.

[0046] 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, an isolated second power supply V2 and an isolated second ground terminal GND2 are obtained.

[0047] As an example of the present application, the first power source V1 is used to output a voltage of 3.3V. The second power source V2 is used to output a voltage of 3.3V.

[0048] The first amplifier circuit 14 includes a first amplifier U2 , a resistor R5 , a resistor R6 , and a resistor R7 .

[0049] The positive phase input terminal of the first amplifier U2 is electrically connected to the first differential signal pin O1 of the first isolation chip U1 through a resistor R3, the positive phase input terminal of the first amplifier U2 is connected to the second ground terminal GND2 through a resistor R5, the negative phase input terminal of the first amplifier U2 is electrically connected to the second differential signal pin O2 of the first isolation chip U1 through a resistor R4, the power supply terminal of the first amplifier U2 is electrically connected to the third power supply V3, the ground terminal of the first amplifier U2 is connected to the second ground terminal GND2, the output terminal of the first amplifier U2 is electrically connected to the negative phase input terminal of the first amplifier U2 through a resistor R6, and the output terminal of the first amplifier U2 is also electrically connected to the signal input terminal of the heat pump 200 through a resistor R7 to output an analog voltage signal with a target voltage range to the signal input terminal of the heat pump 200.

[0050] The second isolation circuit 16 may include a second isolation chip U3 , a resistor R8 , a resistor R9 , a resistor R10 , a resistor R11 , and a resistor R12 .

[0051] The second isolation chip U3 may include a first power pin Vcc1, a second power pin Vcc2, a first ground pin G1, a second ground pin G2, a first signal input pin S1, a first differential signal pin O1, and a second differential signal pin O2.

[0052] The first signal input pin S1 of the second isolation chip U3 is electrically connected to the output end of the first amplifier U1 through a resistor R8, and the first signal input pin S1 of the second isolation chip U3 is also connected to the second ground terminal GND2 through a resistor R9. The first ground pin G1 of the second isolation chip U3 is connected to the first ground terminal GND1, the second ground pin G2 of the second isolation chip U3 is connected to the second ground terminal GND2, the first power pin Vcc1 of the second isolation chip U3 is electrically connected to the first power supply V1 through a resistor R10, and the second power pin Vcc2 of the second isolation chip U3 is electrically connected to the second power supply V2. The first differential signal pin O1 of the second isolation chip U3 is electrically connected to the second amplifier circuit 18 through a resistor R11, and the second differential signal pin O2 of the second isolation chip U3 is electrically connected to the second amplifier circuit 18 through a resistor R12.

[0053] The second amplifier circuit 18 includes a second amplifier U4, a resistor R13, a resistor R14, a resistor R15 and a capacitor C2.

[0054] The positive phase input terminal of the second amplifier U4 is electrically connected to the first differential signal pin O1 of the second isolation chip U3 through the resistor R11, the positive phase input terminal of the second amplifier U4 is also connected to the first ground terminal GND1 through the resistor R13, the negative phase input terminal of the second amplifier U4 is electrically connected to the second differential signal pin O2 of the second isolation chip U3 through the resistor R12, the power supply terminal of the second amplifier U4 is electrically connected to the fourth power supply V4, the ground terminal of the second amplifier U4 is connected to the first ground terminal GND1, the output terminal of the second amplifier U4 is electrically connected to the negative phase input terminal of the second amplifier U4 through the resistor R14, and the output terminal of the second amplifier U4 is also electrically connected to the second signal pin AI of the controller 20 through the resistor R15, so as to output a feedback signal to the second signal pin AI of the controller 20. Among them, the second signal pin AI of the controller 20 is also connected to the first ground terminal GND1 through the capacitor C2.

[0055] The third power supply V3 is an isolated power supply, and the fourth power supply V4 is a system power supply.

[0056] like Figure 5As shown, the fourth power supply V4 and the first ground terminal GND1 are both electrically connected to the second power isolation module 40. After being isolated by the second power isolation module 40, the fourth power supply V4 and the first ground terminal GND1 obtain an isolated third power supply V3 and an isolated second ground terminal GND2.

[0057] As an example of the present application, the third power source V3 is used to output a 12V voltage. The fourth power source V4 is used to output a 12V voltage.

[0058] It can be understood that in the present application, the fourth power source V4 can be converted by a voltage conversion circuit to obtain the first power source V1. Figure 6 As shown, the input end of the power conversion circuit 50 is electrically connected to the fourth power source V4, and the output end of the power conversion circuit 50 can output the first power source V1. As a possible example, the power conversion circuit 50 can be a DC-DC voltage conversion circuit. The power conversion circuit 50 can convert the 12V DC voltage output by the fourth power source V4 into a 3.3V DC voltage.

[0059] The following will be combined Figure 3 The illustrated embodiment introduces in detail the working principle of the heat pump control device 100 of the present application.

[0060] In one application scenario, the first signal pin DAC of the controller 20 outputs a first analog signal with a preset voltage range. For example, since the input voltage range of the isolated operational amplifier sampled in this application is 0-2V, the voltage range of the analog signal output by the first signal pin DAC of the controller 20 is also 0-2V. The first signal input pin S1 of the first isolation chip U1 receives the first analog signal of 0-2V output by the controller 20, and after isolating the first analog signal, outputs the differential signal to the positive input terminal and the negative input terminal of the first amplifier U2 through the first differential signal pin O1 and the second differential signal pin O2 of the first isolation chip U1. The first amplifier U2 amplifies the differential signal with a first preset coefficient to obtain a second analog signal with a target voltage range. For example, the first preset coefficient is 5 times the differential signal, that is, the differential signal output by the first isolation chip U1 is amplified 5 times by the first amplifier U2 to obtain a second analog signal of 0-10V, thereby meeting the requirements of the heat pump control device 100 and the heat pump 200 for interaction. At this time, the analog output voltage accuracy is 4mV. Based on such a design, the heat pump control device 100 of the present application adjusts the voltage amplitude of the analog signal output by the first signal pin DAC through the controller 20, and processes the analog signal by using an isolation circuit and an isolation power supply module to achieve electrical isolation. It also amplifies the analog signal by using a differential amplifier circuit to obtain a 0-10V analog signal, thereby being able to adjust the power percentage of the heat pump 200 with high precision. Compared with the traditional signal sampling circuit directly connected to the input end of the operational amplifier, the input end of the self-feedback circuit 15 of the present application is electrically connected to the output end of the first amplifier U2, and the output end of the self-feedback circuit 15 is electrically connected to the second signal pin AI of the controller 20, so that the analog signal output by the first amplifier circuit 14 can be fed back to the controller 20, so as to detect whether the analog output voltage is accurate. In the specific implementation process, the second isolation circuit 16 collects the second analog signal output by the first amplifier U2, and the second analog signal is divided by the resistor R8, and the voltage reaching the first signal input pin S1 of the second isolation chip U3 is 0-2V. After electrical isolation, the differential signal is output to the second amplifier U4, and then amplified by the second amplifier U4 by 1.5 times to obtain a third analog signal of 0-3V. The third analog signal is input to the second signal pin AI of the controller, and the controller 20 calculates the error value between the analog output voltage and the set value. If the error value is less than or equal to the set threshold (for example, 4mv), the controller 20 determines that the second analog signal output by the signal processing circuit 10 to the heat pump 200 meets the design requirements. If the error value is greater than the set threshold (i.e., the error value is greater than 4mv), the controller 20 determines that the second analog signal output by the signal processing circuit 10 to the heat pump 200 does not meet the design requirements, then the controller 20 can output a signal to the alarm module in the heat pump control device 100 to output a warning message through the alarm module.

[0061] Based on the above-mentioned embodiments, the heat pump control device 100 provided in the present application outputs a first analog signal with a preset voltage range through the signal pin of the controller, and obtains a second analog signal with a target voltage range after isolation processing and differential amplification, and can control the output of the analog signal with high precision. Thus, the power percentage of the heat pump 200 can be adjusted with high precision. In addition, the present application can also collect the output second analog signal and calculate the error between the voltage value of the output analog signal and the set value. When the error is less than or equal to the threshold, it is determined to meet the design requirements. If the error is greater than the threshold, the alarm module outputs a warning message to remind the user, thereby improving the safety and stability of the heat pump system.

[0062] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application. Therefore, as long as they are within the scope of the essence and spirit of the present application, appropriate changes and modifications made to the above embodiments should fall within the scope of protection claimed in the present application.

Claims

1. A heat pump control device, electrically connected to a heat pump, characterized in that: The heat pump control device comprises: a controller, a first isolation circuit, a first amplification circuit and a self-feedback circuit; The controller is configured to output a first analog signal having a preset voltage range; The first isolation circuit is electrically connected to the controller, and the first isolation circuit is configured to perform isolation processing on the first analog signal to output a first differential signal to the first amplification circuit; The first amplifier circuit is electrically connected between the first isolation circuit and the signal input terminal of the heat pump, and the first amplifier circuit is configured to amplify the first differential signal with a first preset coefficient and output a second analog signal with a target voltage range to the heat pump; The self-feedback circuit is electrically connected between the output end of the first amplifying circuit and the controller. The self-feedback circuit is configured to collect the second analog signal, and after processing the second analog signal, feed back a third analog signal to the controller.

2. The heat pump control device according to claim 1, characterized in that: The self-feedback circuit comprises: a second isolation circuit and a second amplification circuit, wherein the second isolation circuit is electrically connected between the first amplification circuit and the second amplification circuit; The second isolation circuit is configured to obtain a second analog signal output by the first amplification circuit, and after isolating the second analog signal, output a second differential signal to the second amplification circuit; The second amplifier circuit is electrically connected between the second isolation circuit and the controller. The second amplifier circuit is configured to amplify the second differential signal with a second preset coefficient and then output the third analog signal to the controller.

3. The heat pump control device according to claim 2, characterized in that: The first preset coefficient is greater than the second preset coefficient.

4. The heat pump control device according to claim 2, characterized in that: The controller is configured to: Determining an error value between a voltage value of the second analog signal and a set voltage value; If the error value is greater than a preset threshold, the alarm module is controlled to output a warning message.

5. The heat pump control device according to claim 2, characterized in that: The controller includes a first signal pin, the first signal pin is electrically connected to the first isolation circuit, and the first signal pin is configured to output a first analog signal with a preset voltage range to the first isolation circuit.

6. The heat pump control device according to claim 5, characterized in that: The first isolation circuit includes a first isolation chip, and the first isolation chip includes a first power pin, a second power pin, a first ground pin, a second ground pin, a first signal input pin, a first differential signal pin, and a second differential signal pin; The first signal input pin of the first isolation chip is electrically connected to the first signal pin of the controller through a first resistor to receive a first analog signal with a preset voltage range output by the controller. The first signal input pin of the first isolation chip is also connected to the first ground terminal through a first capacitor. The first ground pin of the first isolation chip is connected to the first ground terminal. The first power pin of the first isolation chip is electrically connected to the first power supply through a second resistor. The second power pin of the first isolation chip is electrically connected to the second power supply. The second ground pin of the first isolation chip is connected to the second ground terminal. The first differential signal pin of the first isolation chip is electrically connected to the first amplifier circuit through a third resistor. The second differential signal pin of the first isolation chip is electrically connected to the first amplifier circuit through a fourth resistor.

7. The heat pump control device according to claim 6, characterized in that: The heat pump control device also includes a first power isolation module; The first power supply and the first ground terminal are electrically connected to the first power isolation module, the first power supply is isolated by the first power isolation module to obtain the second power supply, and the first ground terminal is isolated by the first power isolation module to obtain the second ground terminal; The first power supply is a system power supply, the first ground terminal is a system ground, the second power supply is an isolated power supply, and the second ground terminal is an isolated ground.

8. The heat pump control device according to claim 6 or 7, characterized in that: The first amplifying circuit includes a first amplifier, a positive phase input terminal of the first amplifier is electrically connected to the first differential signal pin of the first isolation chip through the third resistor, a positive phase input terminal of the first amplifier is connected to the second ground terminal through the fifth resistor, a negative phase input terminal of the first amplifier is electrically connected to the second differential signal pin of the first isolation chip through the fourth resistor, a power supply terminal of the first amplifier is electrically connected to a third power supply, a ground terminal of the first amplifier is connected to the second ground terminal, an output terminal of the first amplifier is electrically connected to the negative phase input terminal of the first amplifier through a sixth resistor, and an output terminal of the first amplifier is also electrically connected to the signal input terminal of the heat pump through a seventh resistor to output a second analog signal with a target voltage range to the heat pump.

9. The heat pump control device according to claim 8, characterized in that: The second isolation circuit includes a second isolation chip, and the second isolation chip includes a first power pin, a second power pin, a first ground pin, a second ground pin, a first signal input pin, a first differential signal pin, and a second differential signal pin; The first signal input pin of the second isolation chip is electrically connected to the output end of the first amplifier through the eighth resistor, and the first signal input pin of the second isolation chip is also connected to the second ground end through the ninth resistor, the first ground pin of the second isolation chip is connected to the first ground end, and the second ground pin of the second isolation chip is connected to the second ground end, the first power pin of the second isolation chip is electrically connected to the first power supply through the tenth resistor, and the second power pin of the second isolation chip is electrically connected to the second power supply, the first differential signal pin of the second isolation chip is electrically connected to the second amplification circuit through the eleventh resistor, and the second differential signal pin of the second isolation chip is electrically connected to the second amplification circuit through the twelfth resistor.

10. The heat pump control device according to claim 9, characterized in that: The second amplifying circuit includes a second amplifier, and the controller further includes a second signal pin; The positive phase input terminal of the second amplifier is electrically connected to the first differential signal pin of the second isolation chip through an eleventh resistor, the positive phase input terminal of the second amplifier is also connected to the first ground terminal through a thirteenth resistor, the negative phase input terminal of the second amplifier is electrically connected to the second differential signal pin of the second isolation chip through a twelfth resistor, the power supply terminal of the second amplifier is electrically connected to a fourth power supply, the ground terminal of the second amplifier is connected to the first ground terminal, the output terminal of the second amplifier is electrically connected to the negative phase input terminal of the second amplifier through a fourteenth resistor, the output terminal of the second amplifier is also electrically connected to the second signal pin of the controller through a fifteenth resistor, and the second signal pin of the controller is also connected to the first ground terminal through a second capacitor.

11. The heat pump control device according to claim 10, characterized in that: The heat pump control device also includes a second power isolation module; The fourth power supply is electrically connected to the second power supply isolation module, and the fourth power supply is isolated by the second power supply isolation module to obtain the third power supply; Wherein, the fourth power supply is a system power supply, and the third power supply is an isolated power supply.

12. A heat pump system, characterized in that: include: A heat pump and a heat pump control device as claimed in any one of claims 1 to 11, wherein the heat pump control device is electrically connected to the heat pump and is used to control the working power of the heat pump.

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