Overcurrent protection circuit, compressor detection circuit and air conditioner

Abstract

The utility model discloses an over-current protection circuit, a compressor detection circuit and an air conditioner, the over-current protection circuit comprises a filtering module, an over-current protection module and a filtering compensation module, the filtering module is used for accessing a current sampling end of a compressor and filtering an over-current detection voltage input by the current sampling end; the over-current protection module is used for outputting an over-current protection signal when the filtered over-current detection voltage is greater than a preset reference voltage; and the filtering compensation module is used for performing filtering compensation on the overcurrent detection voltage according to the overcurrent protection signal when the actual bus voltage of the compressor is smaller than the preset threshold voltage and the current detection voltage of the compressor is smaller than the preset reference voltage. According to the invention, the problem of overcurrent protection false triggering caused by unreal overcurrent detection voltage can be relieved, and the reliability of overcurrent protection is improved.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to an overcurrent protection circuit, a compressor detection circuit, and an air conditioner. Background Technology

[0002] With the increasing popularity of household inverter air conditioners, the requirements for their performance are becoming more stringent. Air conditioners are also becoming more intelligent, and the operating environment is becoming more complex. If grid voltage noise or interference from other appliances occurs, and the capacitance of ceramic capacitors in key circuits on the outdoor unit's circuit board decreases over time, it can affect the accuracy of the sampling signal at the main chip port, leading to false alarms and impacting product reliability.

[0003] Therefore, the technology still needs to be improved and enhanced. Utility Model Content

[0004] This application provides an overcurrent protection circuit, a compressor detection circuit, and an air conditioner, which can alleviate the problem of false triggering of overcurrent protection caused by inaccurate sampling signals.

[0005] This application provides an overcurrent protection circuit for use in an air conditioner, the air conditioner including a compressor, the overcurrent protection circuit including:

[0006] The filtering module is used to connect to the current sampling terminal of the compressor and filter the overcurrent detection voltage input to the current sampling terminal.

[0007] The overcurrent protection module is connected to the filtering module. The overcurrent protection module is used to output an overcurrent protection signal when the overcurrent detection voltage after filtering is greater than the preset reference voltage.

[0008] The filtering compensation module is connected to the filtering module and the overcurrent protection module. The filtering compensation module is used to filter and compensate the overcurrent detection voltage according to the overcurrent protection signal when the actual bus voltage of the compressor is less than the preset threshold voltage and the current detection voltage of the compressor is less than the preset reference voltage.

[0009] In some embodiments of the overcurrent protection circuit, the filter compensation module includes a filter compensation unit and an access control unit. The filter compensation unit is connected to the filter module and the overcurrent protection module, and the access control unit is connected to the filter compensation unit.

[0010] The controller is used to control the compensation unit to connect to the filtering module to perform filtering compensation on the overcurrent detection voltage when the actual bus voltage of the compressor is less than the preset threshold voltage and the actual detection voltage of the compressor is less than the preset reference voltage, based on the overcurrent protection signal.

[0011] In some embodiments of the overcurrent protection circuit, the filter compensation unit includes a first capacitor, one end of which is connected to the filter module and the overcurrent protection module, and the other end of which is connected to the access control unit.

[0012] In some embodiments, the overcurrent protection circuit includes a controller and a switching transistor connected to the control unit. The first terminal of the switching transistor is connected to the controller, the second terminal of the switching transistor is connected to the other terminal of the first capacitor, and the third terminal of the switching transistor is grounded.

[0013] The controller is used to turn on the switch when the actual bus voltage of the compressor is less than the preset threshold voltage and the actual detected voltage of the compressor is less than the preset reference voltage.

[0014] In some embodiments of the overcurrent protection circuit, the filter module includes a first resistor and a second capacitor. One end of the second capacitor is connected to one end of the first resistor and the overcurrent protection module, the other end of the first resistor is connected to the current sampling terminal, and the other end of the second capacitor is grounded.

[0015] In some embodiments of the overcurrent protection circuit, the overcurrent protection module includes a first operational amplifier, a second resistor, a third resistor, a fourth resistor, and a third capacitor. The non-inverting input terminal of the first operational amplifier is connected to the filter module. The inverting input terminal of the first operational amplifier is connected to the non-inverting input terminal of the first operational amplifier, one end of the third resistor, one end of the fourth resistor, and one end of the third capacitor. The other ends of the third resistor, the fourth resistor, and the third capacitor are all grounded. One end of the second resistor is connected to the non-inverting input terminal of the first operational amplifier, and the other end of the second resistor is energized.

[0016] This application embodiment also provides a compressor detection circuit, which includes the overcurrent protection circuit, voltage detection module and current detection module described above. The voltage detection module is used to sample the compressor bus voltage and output the actual bus voltage to the filter compensation module in the overcurrent protection circuit. The current detection module is used to connect to the current sampling terminal of the compressor and amplify the overcurrent detection voltage input from the current sampling terminal to output the current detection voltage to the filter compensation module.

[0017] In some embodiments of the compressor detection circuit, the current detection module includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, and a second operational amplifier. One end of the fifth resistor is connected to the current sampling terminal, and the other end of the fifth resistor is connected to the non-inverting input terminal of the second operational amplifier. One end of the third capacitor, one end of the fifth capacitor, and one end of the sixth resistor are all connected to the non-inverting input terminal of the second operational amplifier. The other ends of the sixth resistor and the fifth capacitor are both energized. One end of the sixth resistor, one end of the seventh resistor, one end of the sixth capacitor, and one end of the seventh capacitor are all connected to the inverting input terminal of the second operational amplifier. The other ends of the sixth capacitor and the seventh capacitor are both grounded. The other ends of the seventh capacitor and the seventh resistor are both connected to the output terminal of the second operational amplifier. One end of the eighth resistor is connected to the output terminal of the second operational amplifier. The other ends of the eighth resistor and the fourth capacitor are both connected to the filter compensation module.

[0018] In some embodiments of the compressor detection circuit, the voltage detection module includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a clamping diode, and an eighth capacitor; one end of the ninth resistor and one end of the eighth capacitor are both connected to the filter compensation module; one end of the ninth resistor, the first end of the clamping diode, and one end of the twelfth resistor are all connected to one end of the thirteenth resistor; the other end of the eighth capacitor, the other end of the thirteenth resistor, and the second end of the clamping diode are all grounded; the third end of the clamping diode is energized; the other end of the twelfth resistor is connected to one end of the tenth resistor through the eleventh resistor; and the other end of the tenth resistor is energized.

[0019] This application also provides an air conditioner, which includes a compressor and the compressor detection circuit described above.

[0020] This application provides an overcurrent protection circuit, a compressor detection circuit, and an air conditioner. The overcurrent protection circuit uses a filtering compensation module to filter and compensate the overcurrent detection voltage based on the overcurrent protection signal when the actual bus voltage of the compressor is less than a preset threshold voltage and the current detection voltage of the compressor is less than a preset reference voltage. This optimizes the filtering effect, alleviates the problem of false triggering of overcurrent protection caused by inaccurate overcurrent detection voltage, and thus improves the reliability of overcurrent protection. Attached Figure Description

[0021] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0022] Figure 1 This is a structural block diagram of the overcurrent protection circuit provided in an embodiment of this application.

[0023] Figure 2This is a structural block diagram of the filter compensation module in the overcurrent protection circuit provided in the embodiments of this application.

[0024] Figure 3 The circuit diagram of the filter compensation module in the overcurrent protection circuit provided in the embodiment of this application.

[0025] Figure 4 This is a structural block diagram of the compressor detection circuit provided in an embodiment of this application.

[0026] Figure 5 The circuit diagram of the current detection module in the compressor detection circuit provided in the embodiment of this application is shown.

[0027] Figure 6 The circuit diagram of the voltage detection module in the compressor detection circuit provided in the embodiment of this application is shown. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Features thus defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0030] Please see Figure 1 , Figure 2 and Figure 3 This application provides an overcurrent protection circuit, which is applied in an air conditioner. The air conditioner includes a compressor. The overcurrent protection circuit includes a filter module 11, an overcurrent protection module 12, and a filter compensation module 13. The overcurrent protection module 12 is connected to the filter module 11, and the filter compensation module 13 is connected to the filter module 11 and the overcurrent protection module 12.

[0031] In specific implementation, the filtering module 11 is used to connect to the current sampling terminal Io of the compressor, and to filter the overcurrent detection voltage input to the current sampling terminal Io before outputting it to the overcurrent protection module 12; the overcurrent protection module 12 is used to compare the filtered overcurrent detection voltage with a preset reference voltage, and when the filtered overcurrent detection voltage is greater than the preset reference voltage, it outputs an overcurrent protection signal to the filtering compensation module 13; the filtering compensation module 13 is used to filter and compensate the overcurrent detection voltage according to the overcurrent protection signal when the actual bus voltage of the compressor is less than the preset threshold voltage and the current detection voltage of the compressor is less than the preset reference voltage.

[0032] In this embodiment, the filter compensation module 13 acquires the actual bus voltage and current detection voltage of the compressor. The actual bus voltage is acquired by the voltage detection module 15 in the air conditioner, and the current detection voltage is acquired by the current detection module 14 in the air conditioner. The current detection module 14 is also connected to the current sampling terminal Io of the compressor. This current sampling terminal Io can be one end of the sampling resistor R0 of the compressor. The current of the compressor passes through the sampling resistor R0 to form a sampling voltage. The current detection module 14 detects this voltage value, amplifies it, and then obtains the current detection voltage. The filtering compensation module 13 compares the actual bus voltage with a preset threshold voltage and simultaneously compares the polarity of the current detection voltage with a preset reference voltage. If the actual bus voltage is less than the preset threshold voltage and the current detection voltage is less than the preset reference voltage, but the filtering compensation module 13 receives an overcurrent protection signal (i.e., the overcurrent detection voltage obtained by the overcurrent protection module 12 through the filtering module 11 is greater than the preset reference voltage), it indicates that the overcurrent detection voltage obtained by the overcurrent protection module 12 is subject to interference fluctuations, or that the filtering effect of the filtering module 11 is poor, resulting in interference signals in the overcurrent detection voltage. This causes the overcurrent detection voltage obtained by the overcurrent protection module 12 to be inconsistent with the current detection voltage, indicating that the overcurrent detection voltage obtained by the overcurrent protection module 12 is not accurate, thus outputting an overcurrent protection signal and causing false triggering of the overcurrent protection. Therefore, the filtering compensation module 13 performs filtering compensation on the overcurrent detection voltage input to the filtering module 11 based on the overcurrent protection signal, optimizing the filtering effect, mitigating the problem of false triggering of the overcurrent protection caused by inaccurate overcurrent detection voltage, and improving the reliability of the overcurrent protection.

[0033] Please continue reading. Figure 2In some embodiments, the filter compensation module 13 includes a filter compensation unit 131 and an access control unit 132. The filter compensation unit 131 is connected to the filter module 11 and the overcurrent protection module 12, and the access control unit 132 is connected to the filter compensation unit 131. The access control unit 132 is used to control the compensation unit to access the filter module 11 according to the overcurrent protection signal when the actual bus voltage of the compressor is less than the preset threshold voltage and the actual detection voltage of the compressor is less than the preset reference voltage. This allows for filtering compensation of the overcurrent detection voltage, optimizing the filtering effect of the filter module 11, thereby alleviating the problem of false triggering of overcurrent protection caused by inaccurate overcurrent detection voltage and improving the reliability of overcurrent protection.

[0034] Please continue reading. Figure 3 In one embodiment, the filter compensation unit 131 includes a first capacitor C1. One end of the first capacitor C1 is connected to the filter module 11 and the overcurrent protection module 12, and the other end of the first capacitor C1 is connected to the access control unit 132. In this embodiment, the first capacitor C1 is a filter capacitor. When the first capacitor C1 is connected to the filter module 11, the input overcurrent detection voltage can be filtered through the first capacitor C1, thereby optimizing the filtering effect.

[0035] In one embodiment, the access control unit 132 includes a controller (not shown in the figure of this embodiment) and a switching transistor Q1. The first end of the switching transistor Q1 is connected to the controller, the second end of the switching transistor Q1 is connected to the other end of the first capacitor C1, and the third end of the switching transistor Q1 is grounded. The controller is used to control the switching transistor Q1 to conduct when the actual bus voltage of the compressor is less than the preset threshold voltage and the actual detection voltage of the compressor is less than the preset reference voltage, so that the first capacitor C1 is connected to the filter module 11, so as to filter the overcurrent detection voltage input to the filter module 11.

[0036] In one embodiment, the filtering module 11 includes a first resistor R1 and a second capacitor C2. One end of the second capacitor C2 is connected to one end of the first resistor R1 and the overcurrent protection module 12, the other end of the first resistor R1 is connected to the current sampling terminal, and the other end of the second capacitor C2 is grounded. When the switch Q1 is off, the first resistor R1 and the second capacitor C2 form an RC filter circuit to filter the input overcurrent detection voltage. When the switch Q1 is on, the first capacitor C1 and the second capacitor C2 are connected in parallel to increase the capacitance value, thereby filtering the overcurrent detection voltage, optimizing the filtering effect, and preventing the capacitance value of the second capacitor C2 from decreasing or external interference from causing a decrease in the accuracy of the overcurrent detection voltage, which could lead to false triggering of the entire device.

[0037] Specifically, when the actual bus voltage of the compressor is less than the preset threshold voltage and the actual detection voltage of the compressor is less than the preset reference voltage, the controller outputs a high-level signal according to the overcurrent protection signal output by the overcurrent protection module 12, that is, the Vcb signal terminal is high and off. At this time, the switching transistor Q1 is turned on, and the first capacitor C1 and the second capacitor C2 are connected in parallel to increase the capacitance value of the filter module 11 to optimize the filtering effect.

[0038] In one embodiment, the overcurrent protection module 12 includes a first operational amplifier IC1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a third capacitor C3. The non-inverting input of the first operational amplifier IC1 is connected to the filter module 11. The inverting input of the first operational amplifier IC1 is connected to the non-inverting input of the first operational amplifier IC1, one end of the third resistor R3, one end of the fourth resistor R4, and one end of the third capacitor C3. The other ends of the third resistor R3, the fourth resistor R4, and the third capacitor C3 are all grounded. One end of the second resistor R2 is connected to the non-inverting input of the first operational amplifier IC1, and the other end of the second resistor R2 is energized. In this embodiment, the first operational amplifier IC1 acts as a comparator to compare the overcurrent detection voltage input through the filter module 11 with a preset reference voltage. When the overcurrent detection voltage is greater than the preset reference voltage, an overcurrent protection signal (a high-level signal in this embodiment) is output. When the overcurrent detection voltage is less than or equal to the preset reference voltage, a low-level signal is output. Thus, the high or low level signals output by the first operational amplifier IC1 can be used to determine whether the compressor has an overcurrent fault.

[0039] Please see Figure 4 This application embodiment also provides a compressor detection circuit, which includes the overcurrent protection circuit, current detection module 14, and voltage detection module 15 described above. Both the voltage detection module 15 and the current detection module 14 are connected to the controller in the filter compensation module 13. The bus voltage detection module 15 samples the compressor's bus voltage and outputs the actual bus voltage to the filter compensation module 13 in the overcurrent protection circuit. The current detection module 14 is connected to the compressor's current sampling terminal Io and amplifies the overcurrent detection voltage input to the current sampling terminal Io to output the current detection voltage to the filter compensation module 13.

[0040] In this embodiment, the controller compares the actual bus voltage with a preset threshold voltage and the current detection voltage with a preset reference voltage. If the actual bus voltage is less than the preset threshold voltage and the current detection voltage is less than the preset reference voltage, but the controller receives a high-level signal from the overvoltage protection module, it indicates that the overvoltage protection module has been falsely triggered. The controller then turns on the switch Q1, connecting the first capacitor C1 in parallel to the filter module 11 to increase its value, thereby enhancing the filtering effect, improving the accuracy of the overvoltage detection voltage, mitigating the false triggering problem, and improving the reliability of the overcurrent protection.

[0041] Please see Figure 5 In one embodiment, the current detection module 14 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, and a second operational amplifier IC2. One end of the fifth resistor R5 is connected to the current sampling terminal Io, and the other end of the fifth resistor R5 is connected to the non-inverting input terminal of the second operational amplifier IC2. One end of the third capacitor C3, one end of the fifth capacitor C5, and one end of the sixth resistor R6 are all connected to the non-inverting input terminal of the second operational amplifier IC2. The sixth resistor R6... The other end of the capacitor and the other end of the fifth capacitor C5 are both energized. One end of the sixth resistor R6, one end of the seventh resistor R7, one end of the sixth capacitor C6, and one end of the seventh capacitor C7 are all connected to the inverting input of the second operational amplifier IC2. The other ends of the sixth capacitor C6 and the other ends of the seventh capacitor C6 are both grounded. The other ends of the seventh capacitor C7 and the other ends of the seventh resistor R7 are both connected to the output of the second operational amplifier IC2. One end of the eighth resistor R8 is connected to the output of the second operational amplifier IC2. The other ends of the eighth resistor R8 and the other ends of the fourth capacitor C4 are both connected to the controller.

[0042] In this embodiment, the non-inverting input terminal of the second operational amplifier IC2 is connected to the current sampling terminal Io to obtain the overcurrent detection voltage. After amplifying the overcurrent detection voltage, the current detection voltage is output to the controller to provide a reference signal for the controller and realize the control of the switching transistor Q1.

[0043] Please see Figure 6In one embodiment, the voltage detection module 15 includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a clamping diode D1, and an eighth capacitor C8. One end of the ninth resistor R9 and one end of the eighth capacitor C8 are connected to the controller. One end of the ninth resistor R9, the first end of the clamping diode D1, and one end of the twelfth resistor R12 are all connected to one end of the thirteenth resistor R13. The other end of the eighth capacitor C8, the other end of the thirteenth resistor R13, and the second end of the clamping diode D1 are all grounded. The third end of the clamping diode D1 is energized. The other end of the twelfth resistor R12 is connected to one end of the tenth resistor R10 through the eleventh resistor R11. The other end of the tenth resistor R10 is energized. In this embodiment, multiple resistors are used to perform voltage division sampling of the bus voltage to obtain the corresponding actual bus voltage. The actual bus voltage is output to the controller via the VDC port to provide a reference signal for the controller.

[0044] It should be noted that the circuit structures of the current detection module 14, voltage detection module 15 and controller in this embodiment are known, and their specific circuit structures and working processes will not be described in detail.

[0045] This application also provides an air conditioner that includes the compressor detection circuit described above. Since the compressor detection circuit has been described in detail above, it will not be repeated here.

[0046] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0047] The overcurrent protection circuit provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An overcurrent protection circuit, applied in an air conditioner, the air conditioner including a compressor, characterized in that, The overcurrent protection circuit includes: A filtering module is provided, which is used to connect to the current sampling terminal of the compressor and filter the overcurrent detection voltage input to the current sampling terminal. An overcurrent protection module is connected to the filtering module; the overcurrent protection module is used to output an overcurrent protection signal when the overcurrent detection voltage after filtering is greater than a preset reference voltage. A filtering compensation module is connected to the filtering module and the overcurrent protection module. The filtering compensation module is used to filter and compensate the overcurrent detection voltage according to the overcurrent protection signal when the actual bus voltage of the compressor is less than a preset threshold voltage and the current detection voltage of the compressor is less than a preset reference voltage.

2. The overcurrent protection circuit according to claim 1, characterized in that, The filtering compensation module includes a filtering compensation unit and an access control unit. The filtering compensation unit is connected to the filtering module and the overcurrent protection module, and the access control unit is connected to the filtering compensation unit. The access control unit is used to control the compensation unit to access the filtering module according to the overcurrent protection signal when the actual bus voltage of the compressor is less than the preset threshold voltage and the actual detection voltage of the compressor is less than the preset reference voltage, so as to perform filtering compensation on the overcurrent detection voltage.

3. The overcurrent protection circuit according to claim 2, characterized in that, The filtering compensation unit includes a first capacitor, one end of which is connected to the filtering module and the overcurrent protection module, and the other end of which is connected to the access control unit.

4. The overcurrent protection circuit according to claim 3, characterized in that, The access control unit includes a controller and a switching transistor. The first end of the switching transistor is connected to the controller, the second end of the switching transistor is connected to the other end of the first capacitor, and the third end of the switching transistor is grounded. The controller is used to control the switching transistor to turn on when the actual bus voltage of the compressor is less than a preset threshold voltage and the actual detection voltage of the compressor is less than a preset reference voltage.

5. The overcurrent protection circuit according to any one of claims 1-4, characterized in that, The filtering module includes a first resistor and a second capacitor. One end of the second capacitor is connected to one end of the first resistor and the overcurrent protection module. The other end of the first resistor is connected to the current sampling terminal, and the other end of the second capacitor is grounded.

6. The overcurrent protection circuit according to claim 5, characterized in that, The overcurrent protection module includes a first operational amplifier, a second resistor, a third resistor, a fourth resistor, and a third capacitor. The non-inverting input terminal of the first operational amplifier is connected to the filtering module. The inverting input terminal of the first operational amplifier is connected to the non-inverting input terminal of the first operational amplifier, one end of the third resistor, one end of the fourth resistor, and one end of the third capacitor. The other ends of the third resistor, the fourth resistor, and the third capacitor are all grounded. One end of the second resistor is connected to the non-inverting input terminal of the first operational amplifier, and the other end of the second resistor is energized.

7. A compressor detection circuit, characterized in that, The compressor detection circuit includes: The overcurrent protection circuit as described in any one of claims 1-6; A voltage detection module is used to sample the bus voltage of the compressor and output the actual bus voltage to the filter compensation module in the overcurrent protection circuit. A current detection module is used to connect to the current sampling terminal of the compressor and amplify the overcurrent detection voltage input from the current sampling terminal to output the current detection voltage to the filter compensation module.

8. The compressor detection circuit according to claim 7, characterized in that, The current detection module includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, and a second operational amplifier. One end of the fifth resistor is connected to the current sampling terminal, and the other end of the fifth resistor is connected to the non-inverting input terminal of the second operational amplifier. One end of the third capacitor, one end of the fifth capacitor, and one end of the sixth resistor are all connected to the non-inverting input terminal of the second operational amplifier. The other ends of the sixth resistor and the fifth capacitor are both energized. One end of the sixth resistor, one end of the seventh resistor, one end of the sixth capacitor, and one end of the seventh capacitor are all connected to the inverting input terminal of the second operational amplifier. The other ends of the sixth capacitor and the seventh capacitor are both grounded. The other ends of the seventh capacitor and the seventh resistor are both connected to the output terminal of the second operational amplifier. One end of the eighth resistor is connected to the output terminal of the second operational amplifier, and the other ends of the eighth resistor and the fourth capacitor are both connected to the filter compensation module.

9. The compressor detection circuit according to claim 7, characterized in that, The voltage detection module includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a clamping diode, and an eighth capacitor. One end of the ninth resistor and one end of the eighth capacitor are both connected to the filter compensation module. One end of the ninth resistor, the first end of the clamping diode, and one end of the twelfth resistor are all connected to one end of the thirteenth resistor. The other end of the eighth capacitor, the other end of the thirteenth resistor, and the second end of the clamping diode are all grounded. The third end of the clamping diode is energized. The other end of the twelfth resistor is connected to one end of the tenth resistor through the eleventh resistor. The other end of the tenth resistor is energized.

10. An air conditioner, characterized in that, The air conditioner includes a compressor and a compressor detection circuit as described in any one of claims 7-9.

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