Compressor protection circuit, compressor control circuit, electrical equipment and vehicle

Abstract

The invention discloses a compressor protection circuit and control circuit, electrical equipment and a vehicle, the compressor protection circuit comprises a plurality of signal acquisition modules, a plurality of signal processing modules and a switch module, the number of the signal acquisition modules corresponds to the number of multi-phase windings of a compressor, and the number of the signal processing modules corresponds to the number of the multi-phase windings of the compressor. The current sensors are used for collecting current signals of each phase winding of the compressor; the input ends of the signal processing modules are correspondingly connected with the signal acquisition modules, and the signal processing modules are used for processing current signals of each phase of winding; the switch module is connected with the output ends of the signal processing modules and is configured to be closed when the processing signal of any phase winding of the corresponding compressor meets the compressor protection condition so as to output a compressor protection signal. The circuit provided by the invention realizes independent acquisition and processing of the current signal of each phase winding, avoids influence on signal acquisition and processing of other phase windings when a circuit module corresponding to a certain phase winding fails, and improves the safety and reliability of the compressor protection circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a compressor protection circuit and a compressor control circuit, electrical equipment and a vehicle. Background Art

[0002] In related technologies, compressor protection circuits are primarily used to monitor the compressor's current status through various methods, quickly entering a protection state when the current is excessive, and preventing the compressor or circuit board components from burning out. Such compressor protection circuits extend the compressor's operating life and improve its safety and reliability. Existing compressor protection circuits collect current signals from the three-phase windings (U, V, and W) through a current acquisition module and process them through a voltage comparison module. This voltage comparison module compares the input signal with a reference voltage signal and outputs a corresponding control signal to the drive circuit module, thereby protecting the compressor.

[0003] However, the design of this compressor protection circuit has some shortcomings. That is, if the current acquisition module or the voltage comparison module fails, the acquisition and processing of all three-phase current signals will be affected, causing the entire compressor protection mechanism to fail, thereby increasing the risk during the compressor operation process and reducing the safety and reliability of the circuit. Summary of the Invention

[0004] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a compressor protection circuit that independently collects and processes the current signal of each phase winding. This prevents a failure in the circuit module corresponding to a particular phase winding from affecting the signal collection and processing of other phase windings, thereby improving the safety and reliability of the compressor protection circuit.

[0005] A second object of the present invention is to provide a compressor control circuit.

[0006] The third object of the present invention is to provide an electrical device.

[0007] A fourth object of the present invention is to provide a vehicle.

[0008] In order to achieve the above-mentioned purpose, the compressor protection circuit of the embodiment of the first aspect of the present invention includes: multiple signal acquisition modules, the multiple signal acquisition modules correspond to the number of multi-phase windings of the compressor, and are used to respectively acquire the current signal of each phase winding of the compressor; multiple signal processing modules, the input ends of the multiple signal processing modules are correspondingly connected to the multiple signal acquisition modules, and are used to respectively process the current signal of each phase winding and output the processed signal corresponding to each phase winding; a switch module, the switch module is connected to the output ends of the multiple signal processing modules, and is configured to close when the processed signal corresponding to any phase winding of the compressor meets the compressor protection condition, so as to output the compressor protection signal.

[0009] According to the compressor protection circuit of the embodiment of the present invention, based on the independent design of multiple signal acquisition modules and multiple signal processing modules, the independent acquisition and processing of the current signal of each phase winding is realized. Specifically, each signal acquisition module corresponds one-to-one to the multi-phase winding of the compressor, ensuring that when any signal acquisition module fails, it will not affect the current signal acquisition function of other phases. At the same time, multiple signal processing modules independently process their corresponding current signals, avoiding the impact of the failure of a single signal processing module on the current signal processing of other phase windings. The switch module integrates the output signals of all signal processing modules, and when the processed signal of any phase winding meets the compressor protection condition, it is closed and a compressor protection signal can be issued, thereby achieving effective protection of the compressor. Therefore, the circuit design of the present invention effectively avoids the impact of the failure of a single signal acquisition module or signal processing module on the entire circuit, thereby improving the safety and reliability of the compressor protection circuit.

[0010] In some embodiments, the signal processing module includes: a signal comparison unit, configured to compare the current signal with a reference signal, and output a comparison signal of the corresponding winding as a processing signal of the corresponding winding.

[0011] In some embodiments, the compressor protection condition includes the comparison signal being a preset level signal, and the preset level signal corresponds to a winding operation fault.

[0012] In some embodiments, the signal processing module further includes: a signal amplifying unit, the input end of the signal amplifying unit is connected to the corresponding signal acquisition module, and the output end of the signal amplifying unit is connected to the signal comparison unit, for amplifying the current signal of the corresponding winding.

[0013] In some embodiments, the signal amplification unit includes: a first operational amplifier, the input end of the first operational amplifier is used to input the current signal of the corresponding winding, and the output end of the first operational amplifier is connected to the input end of the corresponding signal comparison unit for amplifying the current signal of the corresponding winding.

[0014] In some embodiments, the signal amplification unit further includes: an equalizing circuit subunit, wherein the first end of the equalizing circuit subunit is connected to the corresponding signal acquisition module, the second end of the equalizing circuit subunit is connected to the first input end of the first operational amplifier, and the third end of the equalizing circuit subunit is connected to the second input end of the first operational amplifier, for performing equalization processing on the current signal of the corresponding winding.

[0015] In some embodiments, the signal amplification unit further includes: a reference circuit subunit, the first end of which is connected to the third end of the equalization circuit subunit and the second input end of the first operational amplifier, for providing a reference signal for the first operational amplifier.

[0016] In some embodiments, the equalization circuit sub-unit includes: a first resistor and a second resistor, wherein the first end of the first resistor is connected to the corresponding signal acquisition module, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the first input end of the first operational amplifier, and a first node is provided between the first end of the second resistor and the second end of the first resistor; a third resistor and a fourth resistor, wherein the first end of the third resistor is grounded, the second end of the third resistor is connected to the first end of the fourth resistor, the second end of the fourth resistor is connected to the first end of the reference circuit sub-unit and the second input end of the first operational amplifier, and a second node is provided between the second end of the third resistor and the first end of the fourth resistor; and a first capacitor, wherein the first end of the first capacitor is connected to the first node, and the second end of the first capacitor is connected to the second node.

[0017] In some embodiments, the reference circuit subunit includes: a fifth resistor and a sixth resistor, the first end of the fifth resistor is grounded, the second end of the fifth resistor is connected to the first end of the sixth resistor, the second end of the sixth resistor is used to connect to a power supply, and there is a third node between the second end of the fifth resistor and the first end of the sixth resistor, and the third node is connected to the second end of the fourth resistor and the second input end of the first operational amplifier.

[0018] In some embodiments, the signal amplification unit further includes: a feedback circuit sub-unit, the first end of the feedback circuit sub-unit being connected to the first input end of the first operational amplifier and the second end of the equalization circuit sub-unit, and the second end of the feedback circuit sub-unit being connected to the output end of the first operational amplifier for adjusting the gain of the first operational amplifier.

[0019] In some embodiments, the feedback circuit subunit includes: a seventh resistor, a first end of the seventh resistor is connected to the first input end of the first operational amplifier, and a second end of the seventh resistor is connected to the output end of the first operational amplifier; an eighth resistor, a first end of the eighth resistor is connected to the first input end of the first operational amplifier and the first end of the seventh resistor, and a second end of the eighth resistor is connected to the output end of the first operational amplifier and the second end of the seventh resistor; a second capacitor, a first end of the second capacitor is connected to the first input end of the first operational amplifier, the first end of the seventh resistor, and the first end of the eighth resistor, and a second end of the second capacitor is connected to the output end of the first operational amplifier, the second end of the seventh resistor, and the second end of the eighth resistor.

[0020] In some embodiments, the signal amplification unit further includes: a first current limiting subunit, a first end of the first current limiting subunit being connected to the output end of the first operational amplifier, and a second end of the first current limiting subunit being connected to the input end of the corresponding signal comparison unit.

[0021] In some embodiments, the first current limiting sub-unit includes: a ninth resistor, a first end of the ninth resistor is connected to the output end of the first operational amplifier, and a second end of the ninth resistor is connected to the input end of the corresponding signal comparison unit.

[0022] In some embodiments, the signal comparison unit includes: a second current limiting sub-unit, the first end of the second current limiting sub-unit is connected to the output end of the signal amplification unit; a second operational amplifier, the first input end of the second operational amplifier is connected to the second end of the second current limiting sub-unit, and the second input end of the second operational amplifier is suitable for inputting the reference signal, for comparing the amplified current signal with the reference signal, and outputting the comparison signal of the corresponding winding.

[0023] In some embodiments, when the current signal is higher than the reference signal, the comparison signal is a high level signal, and / or when the current signal is lower than the reference signal, the comparison signal is a low level signal.

[0024] In some embodiments, the second current limiting sub-unit includes: a tenth resistor, a first end of the tenth resistor is connected to the output end of the signal amplification unit, and a second end of the tenth resistor is connected to the first input end of the second operational amplifier; a third capacitor, a first end of the third capacitor is grounded, and a second end of the third capacitor is connected to the second end of the tenth resistor and the first input end of the second operational amplifier.

[0025] In some embodiments, the signal comparison unit further includes: an isolation line and a sub-unit, wherein the first end of the isolation line and the sub-unit is connected to the output end of the second operational amplifier, and the second end of the isolation line and the sub-unit is connected to the switch module, for signal isolation and outputting the processing signal of the signal processing module according to the comparison signal output by the connected second operational amplifier.

[0026] In some embodiments, the isolation line and subunit include: a first diode, the cathode of the first diode is connected to the output end of the second operational amplifier, and the anode of the first diode is connected to the switching module, which is used to be turned on when the comparison signal is a low-level signal to output a processed signal that meets the compressor protection condition.

[0027] In some embodiments, the compressor protection circuit further includes: a reference signal generating module, wherein the output end of the reference signal generating module is connected to the second input end of the second operational amplifier in each of the signal processing modules for providing the reference signal.

[0028] In some embodiments, the reference signal generating module includes: an eleventh resistor and a twelfth resistor, the first end of the eleventh resistor is used to connect to a power supply, the second end of the eleventh resistor is connected to the first end of the twelfth resistor, the second end of the twelfth resistor is grounded, and there is a fourth node between the second end of the eleventh resistor and the first end of the twelfth resistor, the fourth node is connected to the second input end of each second operational amplifier to provide the reference signal for each second operational amplifier; a fourth capacitor, the first end of the fourth capacitor is connected to the fourth node, and the second end of the fourth capacitor is grounded.

[0029] In some embodiments, the switch module includes: a switch unit, the first end of the switch unit is used to connect to a power supply, and the second end of the switch unit is suitable for outputting the compressor protection signal, and is used to close when the processing signal corresponding to any phase winding of the compressor meets the compressor protection condition to output the compressor protection signal.

[0030] In some embodiments, the switch module further includes: a filtering unit, wherein the first end of the filtering unit is used to connect to the power supply, and the second end of the filtering unit is connected to the output ends of all the signal processing modules for signal filtering; a current limiting unit, wherein the first end of the current limiting unit is connected to the output ends of all the signal processing modules, and the second end of the current limiting unit is connected to the control end of the switch unit for current limiting.

[0031] In some embodiments, the filtering unit includes: a fifth capacitor, the first end of the fifth capacitor is connected to the first end of the switching module, the first end of the fifth capacitor is also used to connect to the power supply, and the second end of the fifth capacitor is connected to the output end of each of the signal processing modules.

[0032] In some embodiments, the current limiting unit includes: a thirteenth resistor, the first end of the thirteenth resistor is connected to the output end of each signal processing module and the second end of the filtering unit, and the second end of the thirteenth resistor is used to connect to the power supply; a fourteenth resistor, the first end of the fourteenth resistor is connected to the control end of the switching unit, and the second end of the fourteenth resistor is connected to the output end of each signal processing module, the first end of the thirteenth resistor, and the second end of the fifth capacitor.

[0033] In some embodiments, the switching unit includes: a first switching tube, the control end of the first switching tube is connected to the first end of the fourteenth resistor, the first end of the first switching tube is connected to the preset power supply, the first end of the fifth capacitor and the second end of the thirteenth resistor, and the first end of the first switching tube is also used to connect to the power supply; a fifteenth resistor, the first end of the fifteenth resistor is connected to the second end of the first switching tube, and the second end of the fifteenth resistor is suitable for being connected to the drive circuit of the compressor for outputting the compressor protection signal.

[0034] In order to achieve the above-mentioned purpose, the compressor control circuit of the second aspect embodiment of the present invention includes: a multi-phase bridge arm circuit, which is used to be connected to the multi-phase winding of the compressor, and is used to drive each phase winding respectively. Each phase bridge arm circuit is also used to be connected to the signal acquisition module for collecting the current signal of the corresponding phase winding in the compressor protection circuit described in the above embodiment; multiple drive circuits, which are connected to the multi-phase bridge arm circuit respectively, and are used to control each phase bridge arm circuit respectively. Each of the drive circuits is also used to be connected to the output end of the compressor protection circuit, and is also used to control the corresponding phase bridge arm circuit to stop working when receiving the compressor protection signal.

[0035] According to the compressor control circuit of an embodiment of the present invention, by designing multiple drive circuits and multi-phase bridge arm circuits, and connecting them one-to-one with the multi-phase windings of the compressor, independent control and drive of each phase winding is achieved. Specifically, each drive circuit controls the corresponding multi-phase bridge arm circuit respectively, and each phase bridge arm circuit is responsible for driving the corresponding winding. At the same time, the bridge arm circuit is connected to the signal acquisition module in the compressor protection circuit to obtain the current signal of each phase winding in real time. These current signals are transmitted to the compressor protection circuit for processing and generate a protection signal. When the protection signal is received, the drive circuit can promptly instruct the corresponding bridge arm circuit to stop working. By combining the compressor control circuit with the protection circuit, real-time monitoring and abnormal response of the compressor are achieved. This design can not only effectively protect the compressor, but also avoid the impact of single-point failure on the entire circuit through the independent drive of each phase winding and the independent acquisition and processing of the current signal, thereby improving the safety and reliability of the compressor.

[0036] In some embodiments, each phase bridge arm circuit includes an upper bridge circuit and a lower bridge circuit, and both the upper bridge circuit and the lower bridge circuit are connected to the corresponding driving circuit.

[0037] In some embodiments, a gate control circuit is provided between the driving circuit and the connected upper bridge circuit and between the driving circuit and the connected lower bridge circuit, respectively, and the gate control circuit is used to control the opening or discharge of the gate of the switching tube in the bridge arm circuit.

[0038] In some embodiments, the gate control circuit includes: a first gate control module, wherein the first end of the first gate control module is connected to the drive circuit, and the second end of the first gate control module is connected to the control end of the switch tube in the upper bridge circuit or the lower bridge circuit connected to the drive circuit, and is used to work when the switch tube is turned on; a second gate control module, wherein the first end of the second gate control module is connected to the drive circuit and the first end of the first gate control module, and the second end of the second gate control module is connected to the control end of the switch tube in the upper bridge circuit or the lower bridge circuit connected to the drive circuit and the second end of the first gate control module, and is used to work together with the first gate control module to discharge when the switch tube is disconnected.

[0039] In some embodiments, the first gate control module includes: a sixteenth resistor, a first end of the sixteenth resistor is connected to the driving circuit and the first end of the second gate control module, and a second end of the sixteenth resistor is connected to the control end of the switching tube in the upper bridge circuit or the lower bridge circuit connected to the driving circuit.

[0040] In some embodiments, the second gate control module includes: a seventeenth resistor, the first end of the seventeenth resistor is connected to the drive circuit and the first end of the sixteenth resistor; a second diode, the cathode of the second diode is connected to the second end of the seventeenth resistor, and the anode of the second diode is connected to the control end of the switch tube in the upper bridge circuit or the lower bridge circuit connected to the drive circuit and the second end of the sixteenth resistor.

[0041] In order to achieve the above-mentioned purpose, the electrical equipment of the third embodiment of the present invention includes: a compressor; the compressor control circuit described in the above embodiment, the compressor control circuit is connected to the compressor; the compressor protection circuit described in the above embodiment, the compressor protection circuit is connected to the compressor control circuit.

[0042] According to the electrical equipment of the embodiment of the present invention, comprehensive protection and precise control of the compressor are achieved by integrating the compressor, the compressor control circuit and the compressor protection circuit. Specifically, the compressor control circuit is responsible for driving and controlling the multi-phase windings of the compressor, and is connected to the compressor protection circuit accordingly. The compressor protection circuit is responsible for real-time acquisition and processing of the current signals of the multi-phase windings. According to the processing results, when the processing signal of any phase winding meets the compressor protection condition, the switch module is closed to output the compressor protection signal. When the compressor protection signal is received, the compressor control circuit is promptly instructed to stop the corresponding bridge arm circuit from working, thereby effectively preventing damage to the compressor or other circuit components, and achieving protection for the compressor. At the same time, since the acquisition and processing of the drive and current signals of each phase winding are performed independently, this design avoids the impact of single-point failures on the entire equipment, thereby improving the safety and reliability of the compressor.

[0043] In order to achieve the above-mentioned purpose, the vehicle of the fourth aspect embodiment of the present invention includes the compressor protection circuit as described in the above embodiment, or the vehicle includes the compressor control circuit as described in the above embodiment, or the vehicle includes the electrical equipment as described in the above embodiment.

[0044] According to the vehicle of the embodiment of the present invention, by adopting the compressor protection circuit, compressor control circuit or electrical equipment of the above embodiment, independent drive and control of each phase winding and independent collection and processing of the current signal of each phase winding are achieved. This design effectively avoids the impact of a failure in the circuit module corresponding to a phase winding on the entire circuit, thereby significantly improving the safety and reliability of the vehicle compressor.

[0045] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0047] Figure 1 It is the design block diagram of the existing compressor protection circuit;

[0048] Figure 2 is a schematic diagram of a compressor protection circuit according to one embodiment of the present invention;

[0049] Figure 3 is a schematic diagram of an electrical device according to an embodiment of the present invention;

[0050] Figure 4 is a schematic diagram of a vehicle according to one embodiment of the present invention;

[0051] Figure 5 is a schematic diagram of a vehicle according to yet another embodiment of the present invention;

[0052] Figure 6 is a schematic diagram of a vehicle according to yet another embodiment of the present invention.

[0053] Reference numerals:

[0054] Vehicle 100;

[0055] Electrical equipment 110;

[0056] Compressor protection circuit 1; compressor control circuit 4; compressor 5;

[0057] Signal acquisition module 10; signal processing module 20; switch module 30; reference signal generation module 40; bridge arm circuit 50; drive circuit 60; gate control circuit 70;

[0058] Signal amplifying unit 21; signal comparing unit 22; fifth capacitor 31; current limiting unit 32; switch unit 33; eleventh resistor 41; twelfth resistor 42; fourth capacitor 43; second gate control module 72;

[0059] Equalizing circuit subunit 211; reference circuit subunit 212; first operational amplifier 213; feedback circuit subunit 214; ninth resistor 215; second current limiting subunit 221; second operational amplifier 222; first diode 223; thirteenth resistor 321; fourteenth resistor 322; first switch 331; fifteenth resistor 332; sixteenth resistor 711; seventeenth resistor 721; second diode 722;

[0060] a first resistor 2111 , a second resistor 2112 , a third resistor 2113 , a fourth resistor 2114 , a first capacitor 2115 , a fifth resistor 2121 , a sixth resistor 2122 , a seventh resistor 2141 , an eighth resistor 2142 , a second capacitor 2143 , a tenth resistor 2211 , and a third capacitor 2212 . DETAILED DESCRIPTION

[0061] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0062] Figure 1 This is the design block diagram of the existing compressor protection circuit, such as Figure 1 As shown in the figure, the circuit operates as follows: the microcontroller unit (MCU) sends control signals to the intelligent power module (IPM). The IPM manages the compressor's operating status. After receiving instructions from the MCU, it starts or controls the compressor's operation, keeping it in normal operating mode. The current acquisition module collects the three-phase operating currents (U, V, and W). These current signals are key parameters of the compressor's operation. Changes in the three-phase currents (U, V, and W) can indicate whether the compressor is operating normally or experiencing abnormal conditions such as overcurrent or overload.

[0063] Furthermore, after the three-phase current is collected, the signal is input into the voltage comparison module. This module has two inputs: one for the actual current signal collected, and the other for the system's voltage reference signal. The reference signal is typically a preset current threshold or baseline value, representing the current range under normal operating conditions. The voltage comparison module compares the actual current signal collected with the reference signal to determine whether the actual current exceeds the set safety range.

[0064] Furthermore, the signal output by the voltage comparison module is transmitted to the shaping module. The shaping module's function is to trim the output signal of the voltage comparison module into a standard digital signal. The digital signal output by the shaping module can be recognized by the intelligent power module and used as a basis for determining whether the compressor needs to enter a protection state. The digital signal output by the shaping module is equivalent to an enable signal, which determines whether the intelligent power module maintains normal operation of the compressor or shuts down the compressor for protection. Once the shaping module sends a signal indicating excessive current, the intelligent power module shuts down the compressor's power supply to protect the circuit and the compressor itself from damage. This enable signal mechanism can promptly respond to changes in the compressor's operating status, thereby preventing equipment failures caused by overcurrent and overload.

[0065] However, the design of this compressor protection circuit has some shortcomings. That is, if the current acquisition module or the voltage comparison module fails, the acquisition and processing of all three-phase current signals will be affected, causing the entire compressor protection mechanism to fail, thereby increasing the risk during the compressor operation process and reducing the safety and reliability of the circuit.

[0066] To address the above issues, an embodiment of the present invention proposes a compressor protection circuit, which realizes the independent acquisition and processing of the current signal of each phase winding, thereby preventing the signal acquisition and processing of other phase windings from being affected when a circuit module corresponding to a phase winding fails, thereby improving the safety and reliability of the compressor protection circuit.

[0067] Reference below Figure 2 A compressor protection circuit according to an embodiment of the first aspect of the present invention will be described.

[0068] Figure 2 FIG. 1 is a schematic diagram of a compressor protection circuit according to an embodiment of the present invention. Figure 2 As shown, the compressor protection circuit 1 includes: a plurality of signal acquisition modules 10 , a plurality of signal processing modules 20 and a switch module 30 .

[0069] In some embodiments, a plurality of signal acquisition modules 10 correspond to the number of multi-phase windings of the compressor, and are used to respectively collect the current signal of each phase winding of the compressor. Among them, the signal acquisition module 10 can use a shunt resistor as a core component. The shunt resistor can be effectively detected by being connected in series in the circuit of each phase winding of the compressor. The specific principle is: according to Ohm's law, voltage (V) = current (I) × resistance (R). When current flows through the winding, a voltage drop proportional to the current can be generated at both ends of the shunt resistor. By measuring the voltage drop, the signal acquisition module 10 can detect the current in the winding in real time. As the core component of the signal acquisition module 10, the voltage divider resistor has the advantages of low cost and simple structure.

[0070] In some embodiments, in addition to using voltage-dividing resistors as signal acquisition elements, the signal acquisition module 10 may also use other technologies to detect the current signal of the winding, such as a Hall effect sensor, a current transformer, etc.

[0071] In some embodiments, as Figure 2As shown, the number of multiple signal acquisition modules 10 and the number of multi-phase windings of the compressor can all be three, that is, the multi-phase winding can be a three-phase winding. The three-phase windings correspond to three different phases (such as U phase, V phase, and W phase), and they work together to form a stable rotating magnetic field to drive the rotation of the compressor. The U, V, and W three-phase windings are respectively connected to three signal acquisition modules 10. Each signal acquisition module 10 can use a shunt resistor to collect the current signal in each phase winding.

[0072] In some embodiments, the signal processing module 20 may be a circuit unit for processing the raw current signal obtained from the signal acquisition module 10. The input terminals of multiple signal processing modules 20 are connected to corresponding signal acquisition modules 10 to process the current signal of each phase winding separately and output the processed signal corresponding to each phase winding. This connection design enables independent processing of the current signal of each phase winding, preventing a failure of the current processing module corresponding to a phase winding from affecting the processing of the current signals of other phase windings.

[0073] In some embodiments, as Figure 2 As shown, the number of the plurality of signal processing modules 20 can be three, corresponding to the number of the signal acquisition modules 10 and the multi-phase windings. Each signal processing module 20 is connected to its corresponding signal acquisition module 10 to independently process the current signal of the corresponding phase winding.

[0074] In some embodiments, the switch module 30 is connected to the output terminals of the plurality of signal processing modules 20 and is configured to close when the processed signal corresponding to any phase winding of the compressor meets the compressor protection condition, thereby outputting a compressor protection signal. The switch module 30 may employ a switching transistor to implement circuit on / off control.

[0075] In some embodiments, the switch tube can be an electronic switching device such as a MOSFET (Metal-Oxide Semiconductor Field Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor). MOSFETs have fast switching speeds and low on-resistance and are used in applications requiring fast response. IGBTs combine the high speed of MOSFETs with the high current capability of BJTs (Bipolar Junction Transistors) and are suitable for high-voltage, high-power switching applications.

[0076] In some embodiments, in addition to using switching transistors, the switch module 30 can also use other components to achieve similar functions, such as relays and optocouplers. Relays are electromagnetic switching devices suitable for applications requiring high-power isolation. Optocouplers can achieve isolation and switching control through optical signals and can be used in applications requiring electrical isolation.

[0077] In some embodiments, the compressor protection condition may be that the processing signal of any phase winding exceeds the normal operating range, indicating that an abnormal condition such as overload or short circuit has occurred, which may cause damage to the compressor or its control circuit. When the compressor protection condition is met, the switch module 30 will close and output a compressor protection signal to trigger the corresponding protection action. In the output logic of the switch module 30, when the signal state is logic "0", it indicates that the compressor is in a normal state, the switch module 30 is disconnected, and the compressor protection signal is not output. When the signal state is logic "1", it indicates that the compressor is in an abnormal state. At this time, the switch module 30 is closed and a compressor protection signal will be output to execute shutdown or other protection measures.

[0078] According to the compressor protection circuit 1 of the embodiment of the present invention, based on the independent design of multiple signal acquisition modules 10 and multiple signal processing modules 20, independent acquisition and processing of the current signal of each phase winding is achieved. Specifically, each signal acquisition module 10 corresponds one-to-one to the multi-phase winding of the compressor, ensuring that when any signal acquisition module 10 fails, it will not affect the current signal acquisition function of other phases. At the same time, multiple signal processing modules 20 independently process their corresponding current signals, avoiding the impact of the failure of a single signal processing module 20 on the current signal processing of other phase windings. The switch module 30 integrates the output signals of all signal processing modules 20, and when the processed signal of any phase winding meets the compressor protection condition, it is closed and a compressor protection signal can be issued, thereby achieving effective protection of the compressor. Therefore, the circuit design of the present invention effectively avoids the impact of the failure of a single signal acquisition module 10 or signal processing module 20 on the entire circuit, thereby improving the safety and reliability of the compressor protection circuit 1.

[0079] In some embodiments, the signal processing module 20 includes a signal comparison unit 22 for comparing the current signal with a reference signal and outputting a comparison signal of the corresponding winding as a processing signal of the corresponding winding.

[0080] The signal comparison unit 22 can utilize a comparator to perform signal comparison. The comparator compares the input current signal with a preset reference signal and outputs a comparison signal corresponding to the winding (e.g., a high level or a low level). The reference signal can be set to a fixed voltage value, the specific value of which can be set according to actual application requirements to meet different compressor protection requirements.

[0081] In some embodiments, the compressor protection condition includes a comparison signal reaching a preset level, which corresponds to a winding fault. Winding faults can include short circuits, open circuits, or overheating. Winding faults can affect the normal operation of the compressor and may even cause damage. Therefore, it is crucial to detect winding faults in advance and implement protective measures promptly.

[0082] In some embodiments, the signal processing module 20 further includes a signal amplification unit 21. The input of the signal amplification unit 21 is connected to the corresponding signal acquisition module 10, and the output of the signal amplification unit 21 is connected to the signal comparison unit 22. The signal amplification unit 21 is configured to amplify the current signal of the corresponding winding. This is because the current signal collected from the signal acquisition module 10 is typically relatively weak. Through processing by the signal amplification unit 21, the signal amplitude can be increased to a sufficient level for further comparison and processing.

[0083] In some embodiments, the signal amplification unit 21 may employ an operational amplifier with adjustable gain, such as an LM358. This operational amplifier can adjust the gain according to the amplitude of the input signal to accommodate amplification requirements for various current signals. Alternatively, an integrated circuit (IC) module, such as the AD620, may be employed. This module can provide higher-precision signal amplification and reduce noise interference, thereby improving signal processing reliability.

[0084] like Figure 2 As shown, the signal amplifying unit 21 includes a first operational amplifier 213 , the input end of the first operational amplifier 213 is used to input the current signal of the corresponding winding, and the output end of the first operational amplifier 213 is connected to the input end of the corresponding signal comparing unit 22 .

[0085] In some embodiments, first operational amplifier 213 is used to amplify the current signal of the corresponding winding and transmit the amplified signal to signal comparison unit 22. As a core component of signal amplification unit 21, the gain of first operational amplifier 213 determines the degree of signal amplification. When processing weak current signals, by adjusting the gain, first operational amplifier 213 can significantly increase the signal amplitude, ensuring that subsequent signal comparison and processing can be completed accurately.

[0086] In some embodiments, the signal amplification unit 21 further includes an balancing circuit sub-unit 211, a first end of the balancing circuit sub-unit 211 is connected to the corresponding signal acquisition module 10, a second end of the balancing circuit sub-unit 211 is connected to the first input end of the first operational amplifier 213, and a third end of the balancing circuit sub-unit 211 is connected to the second input end of the first operational amplifier 213.

[0087] In some embodiments, the balancing circuit subunit 211 is used to balance the current signals of the corresponding windings. The purpose of this balancing process is to compensate for any inconsistencies in the current signals of each phase winding, making the balanced current signals more suitable for subsequent amplification and comparison. Because actual current signals may be subject to noise, attenuation, or interference, the balancing circuit subunit 211 can maintain consistency in the current signals of each phase winding before output through filtering or gain adjustment.

[0088] Furthermore, due to the complex operating environment of the compressor, the winding current signal may be subject to noise or other interference, resulting in uneven signal amplitude or large fluctuations. The equalization circuit subunit 211 can reduce noise and interference through filtering or other equalization methods, ensuring that the signal is sufficiently stable and smooth before entering the subsequent amplification process.

[0089] In some embodiments, the signal amplifying unit 21 further includes a reference circuit sub-unit, wherein a first terminal of the reference circuit sub-unit is connected to a third terminal of the equalizing circuit sub-unit and a second input terminal of the first operational amplifier.

[0090] In some embodiments, the reference circuit subunit is used to provide a reference signal for the first operational amplifier. This reference signal can be used as a reference value for subsequent signal comparisons, ensuring the accuracy of the signal comparison process. In practical applications, the reference circuit subunit 212 can provide a constant voltage or current value to ensure that the reference point of the entire circuit is stable and consistent. The accuracy and stability of the reference signal directly affect the accuracy of signal processing, especially when the signal comparison unit 22 requires an accurate reference signal to distinguish between normal and abnormal operating conditions.

[0091] like Figure 2 As shown, the balancing circuit subunit 211 includes: a first resistor 2111 , a second resistor 2112 , a third resistor 2113 , a fourth resistor 2114 and a first capacitor 2115 .

[0092] In some embodiments, the first end of the first resistor 2111 is connected to the corresponding signal acquisition module 10, the second end of the first resistor 2111 is connected to the first end of the second resistor 2112, the second end of the second resistor 2112 is connected to the first input end of the first operational amplifier 213, and there is a first node between the first end of the second resistor 2112 and the second end of the first resistor 2111.

[0093] Among them, the first resistor 2111 and the second resistor 2112 can form a resistor voltage divider network, which is used to perform preliminary balancing processing on the winding current signal transmitted from the signal acquisition module 10, that is, to reduce certain unnecessary high-amplitude components in the current signal through voltage division, thereby ensuring that the output signal is more suitable for subsequent amplification processing.

[0094] In some embodiments, the first end of the third resistor 2113 is grounded, the second end of the third resistor 2113 is connected to the first end of the fourth resistor 2114, the second end of the fourth resistor 2114 is connected to the first end of the reference circuit sub-unit 212 and the second input end of the first operational amplifier 213, and there is a second node between the second end of the third resistor 2113 and the first end of the fourth resistor 2114.

[0095] The third resistor 2113 and the fourth resistor 2114 can also form a resistor voltage divider network, which can play a role in voltage division and signal stabilization during the generation of the reference signal.

[0096] In some embodiments, a first end of the first capacitor 2115 is connected to the first node, and a second end of the first capacitor 2115 is connected to the second node. By connecting the first capacitor 2115 between the two nodes, a low-pass filter can be formed to effectively filter out high-frequency noise in the signal, reduce signal fluctuations caused by high-frequency noise, and ensure that the signal is smoother and more stable before entering the first operational amplifier 213.

[0097] like Figure 2 As shown, the reference circuit subunit 212 includes: a fifth resistor 2121 and a sixth resistor 2122. The fifth resistor 2121 and the sixth resistor 2122 together form a resistor voltage divider network. The main function of the voltage divider network is to divide the voltage from a preset power supply to generate a stable reference signal. By precisely adjusting the resistance values of the fifth resistor 2121 and the sixth resistor 2122, the voltage value of the third node can be accurately controlled. This voltage value is the required reference signal. The desired reference signal is thus obtained. The stability of the reference voltage is very important for the accuracy of subsequent signal comparisons.

[0098] In some embodiments, the first end of the fifth resistor 2121 is grounded to provide a stable zero voltage reference point for the reference circuit subunit 212. The second end of the fifth resistor 2121 is connected to the first end of the sixth resistor 2122, and the second end of the sixth resistor 2122 is used to connect to a power supply, so that the resistor divider network can provide a certain voltage value. A third node is provided between the second end of the fifth resistor 2121 and the first end of the sixth resistor 2122. The third node is connected to the second end of the fourth resistor 2114 and the second input end of the first operational amplifier 213. The third node is the output end of the reference signal, which is used to provide a reference signal for the second input end of the first operational amplifier 213, thereby ensuring that it can be accurately compared with the amplified signal in the subsequent comparison process.

[0099] In some embodiments, the signal amplification unit 21 further includes a feedback circuit subunit 214. The feedback circuit subunit 214 adjusts the gain of the first operational amplifier 213 to ensure that the gain setting during the signal amplification process meets design requirements. Specifically, the feedback circuit subunit 214 feeds back a portion of the output signal of the first operational amplifier 213 to its input, thereby forming a negative feedback loop. By precisely adjusting the ratio of the feedback signal, the gain of the first operational amplifier 213 can be controlled to ensure that the amplitude of the output signal is within the desired range, preventing over-amplification or distortion of the signal.

[0100] In some embodiments, a first terminal of the feedback circuit subunit 214 is connected to the first input terminal of the first operational amplifier 213 and the second terminal of the equalization circuit subunit 211, and a second terminal of the feedback circuit subunit 214 is connected to the output terminal of the first operational amplifier 213, for adjusting the gain of the first operational amplifier 213. Through this connection, the feedback circuit can feed back a portion of the signal output by the first operational amplifier 213 to its input terminal, thereby forming negative feedback. This negative feedback mechanism enables precise adjustment of the gain of the operational amplifier, thereby optimizing the signal amplification effect.

[0101] like Figure 2 As shown, the feedback circuit subunit 214 includes: a seventh resistor 2141 , an eighth resistor 2142 and a second capacitor 2143 .

[0102] In some embodiments, a first end of the seventh resistor 2141 is connected to the first input terminal of the first operational amplifier 213, and a second end of the seventh resistor 2141 is connected to the output terminal of the first operational amplifier 213. A first end of the eighth resistor 2142 is connected to the first input terminal of the first operational amplifier 213 and the first end of the seventh resistor 2141, and a second end of the eighth resistor 2142 is connected to the output terminal of the first operational amplifier 213 and the second end of the seventh resistor 2141.

[0103] In some embodiments, the seventh resistor 2141 and the eighth resistor 2142 together form a feedback network, whose resistance determines the proportion of the feedback signal, and by setting appropriate resistance values, the gain of the first operational amplifier 213 can be accurately adjusted, thereby optimizing the signal amplification effect.

[0104] In some embodiments, the first end of the second capacitor 2143 is connected to the first input end of the first operational amplifier 213, the first end of the seventh resistor 2141, and the first end of the eighth resistor 2142, and the second end of the second capacitor 2143 is connected to the output end of the first operational amplifier 213, the second end of the seventh resistor 2141, and the second end of the eighth resistor 2142.

[0105] In some embodiments, the second capacitor 2143 forms a low-pass filter that filters out high-frequency noise and interference in the feedback signal, thereby improving signal stability. The second capacitor 2143 helps maintain the smoothness of the feedback signal, ensuring signal quality during the gain adjustment process of the first operational amplifier 213.

[0106] In some embodiments, the signal amplification unit 21 further includes a first current limiting subunit. The primary function of the first current limiting subunit is to limit the current output from the first operational amplifier 213 to the input of the signal comparison unit 22, thereby preventing excessive current from flowing to the subsequent signal comparison unit 22, thereby avoiding potential overheating, component damage, or other adverse effects. To achieve this function, the first current limiting subunit can use a current limiting element (such as a current limiting resistor, a current limiting diode, etc.) to control the magnitude of the current, ensuring that the amplified signal does not exceed a set current threshold during transmission, thereby ensuring the safe and stable operation of the signal comparison unit 22.

[0107] The first current limiting subunit can use a current limiting element (such as a current limiting resistor, a current limiting diode, etc.) to control the current size, ensuring that the amplified signal does not exceed the set current threshold during transmission, thereby ensuring the safe operation and stable operation of the signal comparison unit 22.

[0108] like Figure 2 As shown, the first current limiting sub-unit includes a ninth resistor 215. The ninth resistor 215 primarily functions to limit the current during signal transmission, preventing the signal current output by the first operational amplifier 213 from being excessively high, thereby ensuring that the current input to the signal comparison unit 22 is within a safe range and protecting the signal comparison unit 22 from excessive current shocks.

[0109] In some embodiments, a first end of the ninth resistor 215 is connected to the output of the first operational amplifier 213, and a second end of the ninth resistor 215 is connected to the input of the corresponding signal comparison unit 22. The resistance of the ninth resistor 215 determines the degree of current limitation it imposes. By selecting an appropriate resistance value, it is possible to ensure that the current output by the first operational amplifier 213 does not exceed the upper limit of the signal comparison unit 22, thereby effectively protecting the normal operation of the unit.

[0110] In some embodiments, the signal comparison unit 22 compares the amplified current signal transmitted from the signal amplification unit 21 with a reference signal to determine whether the compressor winding current is within a safe operating range. If the winding current is too high or too low, the signal comparison unit 22 outputs a corresponding comparison signal for further processing, such as triggering a protection mechanism. The signal comparison unit 22 includes a second current limiting subunit 221 and a second operational amplifier 222.

[0111] The first end of the second current-limiting subunit 221 is connected to the output end of the signal amplifying unit 21. The second current-limiting subunit 221 is used to limit the current transmitted from the output end of the signal amplifying unit 21 to the input end of the second operational amplifier 222. This current-limiting mechanism prevents excessive current from entering the second operational amplifier 222, thereby avoiding potential damage to the circuit or affecting its stability.

[0112] In some embodiments, the second operational amplifier 222 is the core component of the signal comparison unit 22. The first input terminal of the second operational amplifier 222 is connected to the second end of the second current limiting sub-unit 221. The second input terminal of the second operational amplifier 222 is suitable for inputting a reference signal, which is used to compare the amplified current signal with the reference signal and output a comparison signal of the corresponding winding.

[0113] In some embodiments, the comparison signal is a high-level signal when the current signal is higher than a reference signal, and / or a low-level signal when the current signal is lower than the reference signal. Therefore, when the current signal is compared with the reference signal, the comparison signal can output different level signals depending on the magnitude relationship between the two. This signal determines whether the compressor protection mechanism is triggered.

[0114] like Figure 2 As shown, the second current limiting subunit 221 includes: a tenth resistor 2211 and a third capacitor 2212. Among them, the tenth resistor 2211 is used to limit the current flowing through the first input terminal of the second operational amplifier 222 to prevent excessive signal damage to subsequent circuit components. The resistance value of the tenth resistor 2211 determines the degree of current limiting. By selecting an appropriate resistance value, it can be ensured that the input signal of the second operational amplifier 222 is within a safe range.

[0115] In some embodiments, a first end of the tenth resistor 2211 is connected to the output end of the signal amplification unit 21 for receiving the amplified signal and limiting the current. A second end of the tenth resistor 2211 is connected to the first input end of the second operational amplifier 222 for transmitting the current-limited signal to the second operational amplifier 222 for signal comparison processing.

[0116] In some embodiments, the third capacitor 2212 and the tenth resistor 2211 can form a low-pass filter, which mainly functions to filter high-frequency noise or interference in the signal to ensure that the signal input to the second operational amplifier 222 is relatively smooth and stable.

[0117] In some embodiments, a first terminal of the third capacitor 2212 is grounded, and a second terminal of the third capacitor 2212 is connected to the second terminal of the tenth resistor 2211 and the first input terminal of the second operational amplifier 222 .

[0118] In some embodiments, the signal comparison unit 22 further includes an isolation line and a subunit. These isolation lines and subunits are used to transmit the comparison signal from the output of the second operational amplifier 222 to the switch module 30, providing signal isolation during this process. This is done to protect the signal from voltage surges or noise interference during transmission and to prevent mutual interference between different circuit modules.

[0119] In some embodiments, the first end of the isolation line and the subunit is connected to the output end of the second operational amplifier 222, and the second end of the isolation line and the subunit is connected to the switch module 30, which is used for signal isolation and outputs the processing signal of the signal processing module 20 according to the comparison signal output by the connected second operational amplifier 222.

[0120] like Figure 2 As shown, the isolation line and sub-unit include a first diode 223. The first diode 223 can be a reverse-connected diode, and its function is to control its conduction state according to the comparison signal output by the second operational amplifier 222, thereby achieving signal isolation and processing.

[0121] In some embodiments, the cathode of the first diode 223 is connected to the output end of the second operational amplifier 222, and the anode of the first diode 223 is connected to the switch module 30, and is configured to be turned on when the comparison signal is a low-level signal to output a processed signal that meets the compressor protection condition.

[0122] Specifically, when the output signal of the second operational amplifier 222 is at a low level, the cathode voltage of the first diode 223 is lower than the anode voltage, and the first diode 223 is turned on. At this time, the signal is transmitted from the output end of the second operational amplifier 222 to the switch module 30 through the first diode 223. The switch module 30 therefore receives a valid low-level signal, thereby triggering a protective measure or state change, satisfying the compressor protection condition. When the output signal of the second operational amplifier 222 is at a high level, the cathode voltage of the first diode 223 is higher than the anode voltage, and the first diode 223 is not turned on. In this case, the signal cannot be transmitted to the switch module 30 through the diode, and the input end of the switch module 30 remains unchanged, avoiding interference or false triggering of high-level signals.

[0123] like Figure 2 As shown, the three reverse-connected first diodes 223 not only serve as signal isolation, but also can aggregate the output signals of the three second operational amplifiers 222 for centralized processing, acting as a wired-AND operation. In a logic circuit, a wired-AND operation requires that the output is high only when all input signals are high. If any input signal is low, the output will be low. Therefore, when any one of the output signals of the three second operational amplifiers 222 is low, the switch module 30 will output a high-level signal, which is a protection signal and meets the compressor protection condition. When the output signals of the three second operational amplifiers 222 are all high, the switch module 30 outputs a high-impedance state, that is, the signal cannot be transmitted to the switch module 30 through the diodes.

[0124] In some embodiments, the compressor protection circuit 1 further includes a reference signal generating module 40. The reference signal generating module 40 can be used to generate a stable and accurate reference signal, which serves as a comparison standard for the entire compressor protection circuit 1. The stability and accuracy of the reference signal are very important to the performance of the protection circuit.

[0125] In some embodiments, the output end of the reference signal generating module 40 is connected to the second input end of the second operational amplifier 222 in each signal processing module 20. Through this connection method, the reference signal generating module 40 can provide a unified reference signal, so that different signal comparison units 22 can compare current signals based on the same reference signal, thereby achieving consistent comparison standards and reliable protection logic, and avoiding protection failure due to reference signal differences.

[0126] Therefore, using a unified reference signal ensures that all comparison circuits operate under the same standards. This prevents erroneous comparisons or protection decisions caused by inconsistent reference signals, thereby improving system reliability. Providing a precise reference signal enables effective comparison of current signals and accurate protection decisions. This is crucial for protection circuits, especially in applications requiring high precision and reliability. Using a single reference signal source simplifies circuit design, making the system more concise and easier to manage. Furthermore, a unified reference signal reduces design complexity and cost.

[0127] like Figure 2 As shown, the reference signal generating module 40 includes: an eleventh resistor 41, a twelfth resistor 42, and a fourth capacitor 43. The first end of the eleventh resistor 41 is connected to a power supply, the second end of the eleventh resistor 41 is connected to the first end of the twelfth resistor 42, the second end of the twelfth resistor 42 is grounded, and a fourth node is defined between the second end of the eleventh resistor 41 and the first end of the twelfth resistor 42. The fourth node is connected to the second input end of each second operational amplifier 222 to provide a reference signal to each second operational amplifier 222.

[0128] In some embodiments, the eleventh resistor 41 and the twelfth resistor 42 can form a resistor voltage divider network. By selecting appropriate resistance values, the preset power supply voltage can be divided by the eleventh resistor 41 and the twelfth resistor 42 to generate an intermediate voltage, i.e., the voltage at the fourth node. This voltage is used as a reference signal and provided to the second input terminal of the second operational amplifier 222 in each signal comparison unit 22.

[0129] In some embodiments, a first end of the fourth capacitor 43 is connected to the fourth node, and a second end of the fourth capacitor 43 is grounded. The fourth capacitor 43 is configured to filter out high-frequency noise and interference in the reference signal, thereby reducing the impact of power supply noise on the reference signal and ensuring a smooth output reference signal, thereby improving the stability of the reference signal.

[0130] In some embodiments, the capacity of the fourth capacitor 43 is selected based on the desired filtering effect and the frequency characteristics of the reference signal. Generally speaking, the larger the capacitance, the more significant the filtering effect. A capacitor with a sufficient withstand voltage rating can be selected to ensure long-term stable operation in the circuit.

[0131] Therefore, this circuit design provides a stable reference signal to all second operational amplifiers 222. Through resistor voltage division and capacitor filtering, the reference signal has high stability and accuracy, thereby ensuring the reliability and accuracy of the signal comparison unit 22. By uniformly distributing the reference signal to the second operational amplifier 222 of each signal comparison unit 22, it is ensured that each second operational amplifier 222 uses the same reference signal, thereby achieving a consistent comparison standard.

[0132] In some embodiments, the switch module 30 includes a switch unit 33. A first end of the switch unit 33 is used to connect to a power source, and a second end of the switch unit 33 is adapted to output a compressor protection signal. The switch unit 33 is configured to close when a processed signal corresponding to any phase winding of the compressor meets a compressor protection condition, thereby outputting the compressor protection signal.

[0133] The compressor protection condition is when the processed signal for any phase winding is low, indicating that the winding requires protection. In this case, upon receiving the low-level signal, switch unit 33 closes and outputs a high-level compressor protection signal. When the processed signals for all phase windings are high, switch unit 33 remains in a high-impedance state after receiving the high-level input. Switch module 30 does not respond and does not output a protection signal.

[0134] In some embodiments, the switch module 30 further includes a filtering unit and a current limiting unit 32. The filtering unit filters the signal output from the signal processing module 20 to reduce or eliminate high-frequency noise and interference in the signal, ensuring signal stability and accuracy. The current limiting unit 32 can limit the current output from the signal processing module 20 using a current limiting element (such as a current limiting resistor or a current limiting diode), ensuring that the signal does not cause excessive impact on subsequent circuits during transmission, preventing excessive current from causing damage to the circuit or overheating.

[0135] In some embodiments, a first end of the filtering unit is used to connect to a power supply, and a second end of the filtering unit is connected to output ends of all signal processing modules 20 for signal filtering.

[0136] In some embodiments, a first end of the current limiting unit 32 is connected to the output ends of all signal processing modules 20 , and a second end of the current limiting unit 32 is connected to the control end of the switch unit 33 for current limiting.

[0137] like Figure 2 As shown, the filtering unit includes a fifth capacitor 31. The first end of the fifth capacitor 31 is connected to the first end of the switch module 30, the first end of the fifth capacitor 31 is also used to connect to the power supply, and the second end of the fifth capacitor 31 is connected to the output end of each signal processing module 20.

[0138] In some embodiments, the primary function of the fifth capacitor 31 is to reduce or filter out noise and high-frequency interference in the signal, making the signal transmitted to the switch unit 33 smoother and cleaner. The capacitance of the fifth capacitor 31 determines the filter cutoff frequency. Larger capacitance values are suitable for filtering at lower frequencies, while smaller capacitance values are suitable for filtering at higher frequencies. An appropriate capacitance value is selected based on actual needs to optimize the filtering effect.

[0139] like Figure 2 As shown, the current limiting unit 32 includes a thirteenth resistor 321 and a fourteenth resistor 322. The first end of the thirteenth resistor 321 is connected to the output of each signal processing module 20 and the second end of the filter unit, and the second end of the thirteenth resistor 321 is connected to a power supply. The first end of the fourteenth resistor 322 is connected to the control end of the switch unit 33, and the second end of the fourteenth resistor 322 is connected to the output of each signal processing module 20, the first end of the thirteenth resistor 321, and the second end of the fifth capacitor 31.

[0140] In some embodiments, by limiting the current, the thirteenth resistor 321 and the fourteenth resistor 322 can effectively protect important components in the circuit, such as the filter unit and the switch unit 33, from being subjected to excessive current shock, thereby ensuring the stability and safety of the circuit.

[0141] In some embodiments, the thirteenth resistor 321 and the fourteenth resistor 322 can be standard resistors, and their resistance values can be selected based on the specific requirements of the circuit design. The thirteenth resistor 321 and the fourteenth resistor 322 can be designed as adjustable resistors to allow their resistance values to be adjusted as needed in actual applications, thereby optimizing the current limiting effect. This design is suitable for applications that require dynamic adjustment of the current limit.

[0142] For example Figure 2 As shown, the switch unit 33 includes: a first switch tube 331 and a fifteenth resistor 332. The first switch tube 331 can be a bipolar junction transistor (BJT). The control end of the first switch tube 331 is connected to the first end of the fourteenth resistor 322. The first end of the first switch tube 331 is connected to a preset power supply, the first end of the fifth capacitor 31, and the second end of the thirteenth resistor 321. The first end of the first switch tube is also used to connect to the power supply.

[0143] In some embodiments, a first end of the fifteenth resistor 332 is connected to a second end of the first switch tube 331 , and a second end of the fifteenth resistor 332 is adapted to be connected to a drive circuit 60 of the compressor for outputting a compressor protection signal.

[0144] In some embodiments, the operating principle of the switch unit 33 is as follows: when the control terminal (base) of the first switch 331 receives a low-level signal, a voltage difference of approximately 0.7V exists between the control terminal (base) and the first terminal (emitter) of the first switch 331, causing the first switch 331 to conduct. In this state, the second terminal (collector) of the first switch 331 outputs a high-level signal. Therefore, the closed state of the first switch 331 allows current to flow through the fifteenth resistor 332 and outputs a protection signal to the compressor drive circuit 60. If the control signal is high, the first switch 331 is in the open state, and the collector outputs a high-impedance state, which has no impact on the circuit.

[0145] A second embodiment of the present invention provides a compressor control circuit.

[0146] like Figure 2 As shown, the compressor control circuit 4 includes: a multi-phase bridge arm circuit 50 and multiple drive circuits 60. Among them, the multi-phase bridge arm circuit 50 is used to connect to the multi-phase windings of the compressor, and is used to drive each phase winding separately. Each phase bridge arm circuit 50 can independently adjust the current, thereby achieving precise control of each phase winding. Each phase bridge arm circuit 50 is also used to connect to the signal acquisition module 10 in the compressor protection circuit 1 described in the above embodiment, which collects the current signal of the corresponding phase winding. The signal acquisition module 10 is responsible for collecting the current signal from the corresponding phase winding. In this way, the working status and current of each phase winding can be monitored to ensure that the current is within a safe range.

[0147] In some embodiments, the multi-phase bridge arm circuit 50 may include switching elements such as IGBTs. IGBTs are semiconductor devices that combine the high input impedance of MOSFETs with the high current-carrying capacity of BJTs and are suitable for high-power applications. By controlling the switching state of the IGBTs, the current flow through the windings can be precisely adjusted, achieving fine control of the compressor.

[0148] In some embodiments, multiple drive circuits 60 are connected to the multi-phase bridge arm circuits 50 to control each phase bridge arm circuit 50. The drive circuits 60 are responsible for converting control signals into instructions to drive the bridge arm circuits 50, thereby adjusting the on / off state of the bridge arm. Each drive circuit 60 is also connected to the output of the compressor protection circuit 1 and is configured to control the corresponding phase bridge arm circuit 50 to stop operating upon receiving a compressor protection signal, thereby protecting the compressor from potential damage.

[0149] Specifically, the switch module 30 in the compressor protection circuit 1 feeds signal status information back to the drive circuit 60. This signal status information has only two states: a normal state (logic "0") indicates that the current signals of all phase windings are within the normal range. An abnormal state (logic "1") indicates that the current signal of at least one phase winding is abnormal. The drive circuit 60 automatically enters a protection state, stopping driving the bridge arm circuit 50 of the corresponding phase to prevent damage caused by excessive current.

[0150] According to the compressor control circuit 4 of the embodiment of the present invention, by designing multiple drive circuits 60 and multi-phase bridge arm circuits 50, and connecting them one-to-one with the multi-phase windings of the compressor, independent control and drive of each phase winding is achieved. Specifically, each drive circuit 60 controls the corresponding multi-phase bridge arm circuit 50 respectively, and each phase bridge arm circuit 50 is responsible for driving the corresponding winding. At the same time, the bridge arm circuit 50 is connected to the signal acquisition module 10 in the compressor protection circuit 1 to obtain the current signal of each phase winding in real time. These current signals are transmitted to the compressor protection circuit 1 for processing and generate a protection signal. When the protection signal is received, the drive circuit 60 can promptly instruct the corresponding bridge arm circuit 50 to stop working. By combining the compressor control circuit 4 with the protection circuit, real-time monitoring and abnormal response of the compressor are achieved. This design can not only effectively protect the compressor, but also avoid the impact of single-point failure on the entire circuit through independent driving of each phase winding and independent acquisition and processing of current signals, thereby improving the safety and reliability of the compressor.

[0151] like Figure 2 As shown, each phase bridge arm circuit 50 includes an upper bridge circuit and a lower bridge circuit, forming a typical full-bridge structure for driving each phase winding of the compressor. The main function of the full-bridge circuit is to achieve bidirectional control of current direction by switching the upper and lower bridge arms, thereby controlling the current flow in the winding.

[0152] Therefore, the upper and lower bridge circuits work together to control the current in that phase winding. The upper bridge circuit is responsible for providing voltage from the power supply to the load, while the lower bridge circuit controls the return path of the current. By working together, they adjust the current direction in the winding, thereby achieving precise control of the phase winding.

[0153] In some embodiments, each upper bridge circuit and lower bridge circuit is connected to a corresponding driver circuit 60. The driver circuit 60 generates a signal for controlling the switching state of the bridge arm, thereby controlling the flow of current. The driver circuit 60 can adjust the on and off states of the upper bridge circuit and the lower bridge circuit through pulse width modulation (PWM) or other control methods. This allows for precise control of the current in each winding to achieve smooth operation of the compressor.

[0154] In some embodiments, each driver circuit 60 independently controls the upper and lower bridge circuits of the corresponding phase. When the upper bridge circuit is on, the lower bridge circuit is off, meaning the upper and lower bridge circuits operate in a time-sharing manner, thereby driving the compressor. The entire circuit switching logic is controlled by controller software.

[0155] In some embodiments, a gate control circuit 70 is provided between the driving circuit 60 and the connected upper bridge circuit and between the driving circuit 60 and the connected lower bridge circuit, respectively. The gate control circuit 70 is used to control the opening or discharging of the gate of the switching tube in the bridge arm circuit 50.

[0156] like Figure 2 As shown, the gate control circuit 70 includes: a first gate control module and a second gate control module 72 .

[0157] Among them, the first end of the first gate control module is connected to the driving circuit 60, and the second end of the first gate control module is connected to the control end of the switch tube in the upper bridge circuit or the lower bridge circuit connected to the driving circuit 60, which is used to work when the switch tube is turned on.

[0158] Specifically, when the switch needs to be turned on, the first gate control module receives a control signal from the drive circuit 60 via its first terminal. This control signal causes the first gate control module to provide a high level to the gate of the switch, turning on the switch. At this point, current can flow through the winding, driving the compressor.

[0159] In some embodiments, the first end of the second gate control module 72 is connected to the driving circuit 60 and the first end of the first gate control module, and the second end of the second gate control module 72 is connected to the control end of the switch tube in the upper bridge circuit or the lower bridge circuit connected to the driving circuit 60 and the second end of the first gate control module, and is used to work together with the first gate control module to discharge when the switch tube is disconnected.

[0160] Specifically, when the switch needs to be turned off, the second gate control module 72 works in conjunction with the first gate control module to quickly discharge the voltage, ensuring that the gate voltage of the switch drops to zero, thereby turning the switch off. This design benefits from the parallel connection of the components in the second and first gate control modules, creating an additional discharge circuit, reducing the time it takes to turn off the switch and providing excellent protection.

[0161] like Figure 2 As shown, the first gate control module includes a sixteenth resistor 711. The first end of the sixteenth resistor 711 is connected to the driving circuit 60 and the first end of the second gate control module 72, and the second end of the sixteenth resistor 711 is connected to the control end of the switch tube in the upper bridge circuit or the lower bridge circuit connected to the driving circuit 60.

[0162] In some embodiments, the sixteenth resistor 711 functions as a current limiter and voltage divider in the first gate control module. Specifically, when the driver circuit 60 issues a control signal, the sixteenth resistor 711 provides an appropriate current path through its connection terminals, thereby transmitting the signal to the gate of the switch. This resistor helps control changes in the gate voltage, allowing the switch to be properly turned on or off according to the control signal. By adjusting the resistance of the sixteenth resistor 711, the gate current can be controlled, thereby affecting the switching speed and stability of the switch.

[0163] In some embodiments, the second gate control module 72 includes a seventeenth resistor 721 and a second diode 722 , wherein a first end of the seventeenth resistor 721 is connected to the driving circuit 60 and a first end of the sixteenth resistor 711 .

[0164] In some embodiments, the cathode of the second diode 722 is connected to the second end of the seventeenth resistor 721, and the anode of the second diode 722 is connected to the control terminal of the switch in the upper bridge circuit or the lower bridge circuit connected to the drive circuit 60 and the second end of the sixteenth resistor 711. The second diode 722 can quickly discharge the gate voltage and prevent current from flowing in the wrong direction, thereby protecting the circuit from possible damage caused by reverse current.

[0165] Reference below Figure 3 An electrical device according to an embodiment of a third aspect of the present invention is described.

[0166] Figure 3 is a schematic diagram of an electrical device according to an embodiment of the present invention, Figure 3 As shown, the electrical device 110 includes: a compressor 5, the compressor control circuit 4 described in the above embodiment, and the compressor protection circuit 1 described in the above embodiment.

[0167] In some embodiments, the compressor 5 is a core component of the electrical device 110 , used for compressing gas, and is widely used in air-conditioning systems, refrigeration equipment, and various industrial applications.

[0168] In some embodiments, the compressor control circuit 4 is connected to the compressor 5 , and achieves precise control of the compressor 5 by controlling the multi-phase bridge arm circuit 50 , the drive circuit 60 and the gate control circuit 70 .

[0169] In some embodiments, compressor protection circuit 1 is connected to compressor control circuit 4. Compressor protection circuit 1 monitors the current signal in real time to ensure it remains within a safe range. If an abnormality is detected, such as excessive current or other fault, compressor protection circuit 1 generates a compressor 5 protection signal and transmits it to compressor control circuit 4, which automatically shuts down the corresponding phase bridge arm circuit 50, protecting compressor 5 from damage.

[0170] In some embodiments, the electrical equipment 110 may include air conditioners (such as household air conditioners, commercial air conditioners, car air conditioners, etc.), refrigerators (such as household refrigerators, car refrigerators, etc.), laboratory cooling equipment, medical cooling equipment, etc.

[0171] According to the electrical equipment 110 of the embodiment of the present invention, comprehensive protection and precise control of the compressor 5 are achieved by integrating the compressor 5, the compressor control circuit 4 and the compressor protection circuit 1. Specifically, the compressor control circuit 4 is responsible for driving and controlling the multi-phase windings of the compressor 5, and is correspondingly connected to the compressor protection circuit 1, and the compressor protection circuit 1 is responsible for real-time acquisition of the current signal of the multi-phase winding and processing it. According to the processing result, when the processing signal of any phase winding meets the compressor protection condition, the switch module 30 is closed to output the compressor protection signal. When the compressor protection signal is received, the compressor control circuit 4 is promptly instructed to stop the corresponding bridge arm circuit 50 from working, thereby effectively preventing damage to the compressor 5 or other circuit components, and achieving protection for the compressor 5. At the same time, since the acquisition and processing of the driving and current signals of each phase winding are performed independently, this design avoids the impact of single-point failures on the entire equipment, thereby improving the safety and reliability of the compressor 5.

[0172] Reference below Figure 4-Figure 6 A vehicle according to an embodiment of a fourth aspect of the present invention will be described.

[0173] Figure 4 is a schematic diagram of a vehicle according to an embodiment of the present invention, as shown in Figure 4 As shown, vehicle 100 includes a compressor protection circuit 1 as described in the above embodiment. Compressor protection circuit 1 monitors the operating status of compressor 5 and activates a protection mechanism in the event of abnormal conditions (such as overheating, overcurrent, winding faults, etc.). Compressor protection circuit 1 effectively prevents compressor 5 from damage due to abnormal operating conditions, thereby extending the service life of compressor 5.

[0174] Figure 5 is a schematic diagram of a vehicle according to yet another embodiment of the present invention, as shown Figure 5 As shown, the vehicle 100 includes the compressor control circuit 4 as described in the above embodiment. This circuit can control the on and off of the switch tube in the bridge arm circuit 50, thereby achieving precise control of the compressor 5.

[0175] Figure 6 is a schematic diagram of a vehicle according to yet another embodiment of the present invention, as shown Figure 6 As shown, the vehicle 100 includes the electric device 110 as described in the above embodiments.

[0176] In some embodiments, the vehicle 100 may include various types of vehicles, such as passenger cars, commercial vehicles, public transportation vehicles, work vehicles, special vehicles, etc.

[0177] According to the vehicle 100 of the embodiment of the present invention, by adopting the electrical equipment 110 of the above embodiment, independent driving and control of each phase winding and independent collection and processing of the current signal of each phase winding are achieved. This design effectively avoids the impact of a failure in the circuit module corresponding to a certain phase winding on the entire circuit, thereby significantly improving the safety and reliability of the compressor 5 of the vehicle 100.

[0178] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0179] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A compressor protection circuit, characterized in that: include: A plurality of signal acquisition modules, the plurality of signal acquisition modules corresponding to the number of multi-phase windings of the compressor, and configured to respectively acquire a current signal of each phase winding of the compressor; a plurality of signal processing modules, wherein input ends of the plurality of signal processing modules are correspondingly connected to the plurality of signal acquisition modules, and are configured to process the current signal of each phase winding respectively and output a processed signal corresponding to each phase winding; A switch module is connected to the output ends of the plurality of signal processing modules and is configured to close when the processing signal corresponding to any one phase winding of the compressor meets the compressor protection condition to output a compressor protection signal.

2. The compressor protection circuit according to claim 1, characterized in that: The signal processing module includes: The signal comparison unit is used to compare the current signal with a reference signal and output a comparison signal of the corresponding winding as a processing signal of the corresponding winding.

3. The compressor protection circuit according to claim 2, characterized in that: The compressor protection condition includes that the comparison signal is a preset level signal, and the preset level signal corresponds to a winding operation fault.

4. The compressor protection circuit according to claim 2, characterized in that: The signal processing module further includes: A signal amplifying unit, wherein the input end of the signal amplifying unit is connected to the corresponding signal acquisition module, and the output end of the signal amplifying unit is connected to the signal comparing unit, and is used to amplify the current signal of the corresponding winding.

5. The compressor protection circuit according to claim 4, characterized in that: The signal amplification unit includes: A first operational amplifier, wherein the input end of the first operational amplifier is used to input the current signal of the corresponding winding, and the output end of the first operational amplifier is connected to the input end of the corresponding signal comparison unit, and is used to amplify the current signal of the corresponding winding.

6. The compressor protection circuit according to claim 5, characterized in that: The signal amplification unit further includes: A balancing circuit subunit, wherein a first end of the balancing circuit subunit is connected to the corresponding signal acquisition module, a second end of the balancing circuit subunit is connected to the first input end of the first operational amplifier, and a third end of the balancing circuit subunit is connected to the second input end of the first operational amplifier, for balancing the current signal of the corresponding winding.

7. The compressor protection circuit according to claim 6, characterized in that: The signal amplification unit further includes: A reference circuit subunit, wherein a first end of the reference circuit subunit is connected to the third end of the equalizing circuit subunit and the second input end of the first operational amplifier, and is used to provide a reference signal for the first operational amplifier.

8. The compressor protection circuit according to claim 7, characterized in that: The equalizing circuit subunit includes: a first resistor and a second resistor, wherein a first end of the first resistor is connected to the corresponding signal acquisition module, a second end of the first resistor is connected to a first end of the second resistor, a second end of the second resistor is connected to a first input end of the first operational amplifier, and a first node is defined between the first end of the second resistor and the second end of the first resistor; a third resistor and a fourth resistor, wherein a first end of the third resistor is grounded, a second end of the third resistor is connected to a first end of the fourth resistor, a second end of the fourth resistor is connected to a first end of the reference circuit subunit and a second input end of the first operational amplifier, and a second node is defined between the second end of the third resistor and the first end of the fourth resistor; A first capacitor, wherein a first end of the first capacitor is connected to the first node, and a second end of the first capacitor is connected to the second node.

9. The compressor protection circuit according to claim 8, characterized in that: The reference circuit subunit includes: A fifth resistor and a sixth resistor, wherein the first end of the fifth resistor is grounded, the second end of the fifth resistor is connected to the first end of the sixth resistor, the second end of the sixth resistor is used to connect to a power supply, and a third node is provided between the second end of the fifth resistor and the first end of the sixth resistor, and the third node is connected to the second end of the fourth resistor and the second input end of the first operational amplifier.

10. The compressor protection circuit according to claim 6, characterized in that: The signal amplification unit further includes: A feedback circuit subunit, wherein a first end of the feedback circuit subunit is connected to the first input end of the first operational amplifier and a second end of the equalization circuit subunit, and a second end of the feedback circuit subunit is connected to the output end of the first operational amplifier, for adjusting the gain of the first operational amplifier.

11. The compressor protection circuit according to claim 10, characterized in that: The feedback circuit subunit includes: a seventh resistor, wherein a first end of the seventh resistor is connected to the first input end of the first operational amplifier, and a second end of the seventh resistor is connected to the output end of the first operational amplifier; an eighth resistor, wherein a first end of the eighth resistor is connected to the first input end of the first operational amplifier and the first end of the seventh resistor, and a second end of the eighth resistor is connected to the output end of the first operational amplifier and the second end of the seventh resistor; a second capacitor, wherein a first end of the second capacitor is connected to the first input end of the first operational amplifier, the first end of the seventh resistor, and the first end of the eighth resistor; and a second end of the second capacitor is connected to the output end of the first operational amplifier, the second end of the seventh resistor, and the second end of the eighth resistor.

12. The compressor protection circuit according to any one of claims 5 to 11, characterized in that: The signal amplification unit further includes: A first current limiting subunit, wherein a first end of the first current limiting subunit is connected to the output end of the first operational amplifier, and a second end of the first current limiting subunit is connected to the input end of the corresponding signal comparison unit.

13. The compressor protection circuit according to claim 12, characterized in that: The first current limiting subunit includes: A ninth resistor, wherein a first end of the ninth resistor is connected to the output end of the first operational amplifier, and a second end of the ninth resistor is connected to the input end of the corresponding signal comparison unit.

14. The compressor protection circuit according to claim 4, characterized in that: The signal comparison unit includes: a second current limiting subunit, wherein a first end of the second current limiting subunit is connected to the output end of the signal amplifying unit; A second operational amplifier, wherein the first input terminal of the second operational amplifier is connected to the second terminal of the second current limiting sub-unit, and the second input terminal of the second operational amplifier is suitable for inputting the reference signal, for comparing the amplified current signal with the reference signal, and outputting the comparison signal of the corresponding winding.

15. The compressor protection circuit according to claim 14, characterized in that: When the current signal is higher than the reference signal, the comparison signal is a high-level signal, and / or when the current signal is lower than the reference signal, the comparison signal is a low-level signal.

16. The compressor protection circuit according to claim 14, characterized in that: The second current limiting subunit includes: a tenth resistor, wherein a first end of the tenth resistor is connected to the output end of the signal amplifying unit, and a second end of the tenth resistor is connected to the first input end of the second operational amplifier; A third capacitor, wherein a first end of the third capacitor is grounded, and a second end of the third capacitor is connected to the second end of the tenth resistor and the first input end of the second operational amplifier.

17. The compressor protection circuit according to claim 14, characterized in that: The signal comparison unit further includes: An isolation line and a sub-unit, wherein the first end of the isolation line and the sub-unit are connected to the output end of the second operational amplifier, and the second end of the isolation line and the sub-unit are connected to the switch module, for signal isolation and outputting the processing signal of the signal processing module according to the comparison signal output by the connected second operational amplifier.

18. The compressor protection circuit according to claim 17, characterized in that: The isolation line and subunit include: a first diode, wherein the cathode of the first diode is connected to the output end of the second operational amplifier, and the anode of the first diode is connected to the switch module, and is configured to be turned on when the comparison signal is a low-level signal to output a processing signal that meets the compressor protection condition.

19. The compressor protection circuit according to claim 14, characterized in that: The compressor protection circuit further includes: A reference signal generating module, wherein the output end of the reference signal generating module is connected to the second input end of the second operational amplifier in each of the signal processing modules, and is used to provide the reference signal.

20. The compressor protection circuit according to claim 19, characterized in that: The reference signal generating module includes: an eleventh resistor and a twelfth resistor, wherein a first end of the eleventh resistor is connected to a power supply, a second end of the eleventh resistor is connected to the first end of the twelfth resistor, and a second end of the twelfth resistor is grounded; a fourth node is defined between the second end of the eleventh resistor and the first end of the twelfth resistor, and the fourth node is connected to the second input end of each of the second operational amplifiers to provide the reference signal to each of the second operational amplifiers; a fourth capacitor, wherein a first end of the fourth capacitor is connected to the fourth node, and a second end of the fourth capacitor is grounded.

21. The compressor protection circuit according to claim 1, characterized in that: The switch module includes: A switch unit, wherein the first end of the switch unit is used to connect to a power supply, and the second end of the switch unit is suitable for outputting the compressor protection signal, and is used to close when the processing signal corresponding to any phase winding of the compressor meets the compressor protection condition to output the compressor protection signal.

22. The compressor protection circuit according to claim 21, characterized in that: The switch module further includes: A filtering unit, wherein a first end of the filtering unit is used to connect to a power supply, and a second end of the filtering unit is connected to the output ends of all the signal processing modules for signal filtering; A current limiting unit, wherein a first end of the current limiting unit is connected to the output ends of all the signal processing modules, and a second end of the current limiting unit is connected to the control end of the switch unit for current limiting.

23. The compressor protection circuit according to claim 22, characterized in that: The filtering unit comprises: A fifth capacitor, wherein a first end of the fifth capacitor is connected to the first end of the switch module, the first end of the fifth capacitor is also used to connect to a power supply, and a second end of the fifth capacitor is connected to the output end of each of the signal processing modules.

24. The compressor protection circuit according to claim 23, characterized in that: The current limiting unit includes: a thirteenth resistor, a first end of the thirteenth resistor being connected to the output end of each of the signal processing modules and the second end of the filtering unit, and a second end of the thirteenth resistor being connected to a power supply; A fourteenth resistor, wherein the first end of the fourteenth resistor is connected to the control end of the switch unit, and the second end of the fourteenth resistor is connected to the output end of each signal processing module, the first end of the thirteenth resistor, and the second end of the fifth capacitor.

25. The compressor protection circuit according to claim 24, characterized in that: The switch unit includes: a first switching transistor, wherein a control end of the first switching transistor is connected to the first end of the fourteenth resistor, a first end of the first switching transistor is connected to the first end of the fifth capacitor and the second end of the thirteenth resistor, and the first end of the first switching transistor is further connected to a power supply; A fifteenth resistor, wherein a first end of the fifteenth resistor is connected to the second end of the first switching tube, and a second end of the fifteenth resistor is suitable for being connected to the driving circuit of the compressor for outputting the compressor protection signal.

26. A compressor control circuit, characterized in that: include: A multi-phase bridge arm circuit, the multi-phase bridge arm circuit being used to be connected to the multi-phase windings of the compressor, and to drive each phase winding respectively, and each phase bridge arm circuit is further used to be connected to a signal acquisition module in the compressor protection circuit according to any one of claims 1 to 25 for collecting the current signal of the corresponding phase winding; Multiple drive circuits are connected to the multi-phase bridge arm circuits respectively and are used to control each phase bridge arm circuit respectively. Each drive circuit is also used to be connected to the output end of the compressor protection circuit and is configured to control the corresponding phase bridge arm circuit to stop working when receiving a compressor protection signal.

27. The compressor control circuit according to claim 26, characterized in that: Each phase bridge arm circuit includes an upper bridge circuit and a lower bridge circuit, and both the upper bridge circuit and the lower bridge circuit are connected to the corresponding driving circuit.

28. The compressor control circuit according to claim 27, characterized in that: A gate control circuit is provided between the drive circuit and the connected upper bridge circuit and between the drive circuit and the connected lower bridge circuit, respectively. The gate control circuit is used to control the opening or discharging of the gate of the switch tube in the bridge arm circuit.

29. The compressor control circuit according to claim 28, characterized in that The gate control circuit includes: a first gate control module, wherein a first end of the first gate control module is connected to the drive circuit, and a second end of the first gate control module is connected to a control end of a switch tube in the upper bridge circuit or the lower bridge circuit connected to the drive circuit, and is configured to function when the switch tube is turned on; A second gate control module, wherein the first end of the second gate control module is connected to the drive circuit and the first end of the first gate control module, and the second end of the second gate control module is connected to the control end of the switch tube in the upper bridge circuit or the lower bridge circuit connected to the drive circuit and the second end of the first gate control module, and is used to work together with the first gate control module to discharge when the switch tube is disconnected.

30. The compressor control circuit according to claim 29, wherein: The first gate control module includes: A sixteenth resistor, wherein the first end of the sixteenth resistor is connected to the driving circuit and the first end of the second gate control module, and the second end of the sixteenth resistor is connected to the control end of the switching tube in the upper bridge circuit or the lower bridge circuit connected to the driving circuit.

31. The compressor control circuit according to claim 30, characterized in that The second gate control module includes: a seventeenth resistor, a first end of the seventeenth resistor being connected to the driving circuit and the first end of the sixteenth resistor; A second diode, the cathode of the second diode is connected to the second end of the seventeenth resistor, and the anode of the second diode is connected to the control end of the switch tube in the upper bridge circuit or the lower bridge circuit connected to the drive circuit and the second end of the sixteenth resistor.

32. An electrical device, characterized in that: include: compressor; The compressor control circuit according to any one of claims 26 to 31, wherein the compressor control circuit is connected to the compressor; The compressor protection circuit according to any one of claims 1 to 25, wherein the compressor protection circuit is connected to the compressor control circuit.

33. A vehicle, characterized in that: The vehicle includes the compressor protection circuit according to any one of claims 1 to 25, or the vehicle includes the compressor control circuit according to any one of claims 26 to 31, or the vehicle includes the electrical device according to claim 32.

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