Anti-interference protection circuit and method for air conditioner compressor power device and air conditioner

Abstract

The invention discloses an anti-interference protection circuit and method for an air conditioner compressor power device and an air conditioner. The anti-interference protection circuit comprises a current signal acquisition module, a differential amplification module, a protection judgment module and a control chip. The current signal acquisition module is connected to a current output pin of an intelligent power module (IPM) of an air conditioner compressor and acquires the total current of the IPM. Carrying out differential amplification on the collected total current signal through a differential amplification module; the protection judgment module outputs a classification protection signal to a CIN pin of the IPM and the control chip based on the total current signal after differential amplification; and the control chip sends a corresponding control signal to an intelligent power module (IPM) of the air conditioner compressor based on the classification protection signal. While the error protection problem caused by interference is solved, frequency limiting and reducing processing is carried out before shutdown, and the operation reliability of the unit is improved.

Description

Technical Field

[0001] The present invention relates to the field of power electronics technology, and in particular to an anti-interference protection circuit, method and air conditioner for power devices of an air conditioner compressor. Background Art

[0002] In the application of driving motors of air conditioner power devices, the total current of an Intelligent Power Module (IPM) is sampled in the form of resistor voltage division. Manufacturers usually recommend directly sending the sampled value to the CIN pin of the IPM for circuit design.

[0003] As Figure 1 shown, a conventional control circuit is as follows: a control chip U1 is connected to the IPM. The control chip coordinates functions such as PWM generation and IPM driving. The PWM wave generated by the control chip drives the compressor to operate through the IPM module. The current of the air conditioner compressor controlled by the IPM module returns to the ground through a sampling resistor R1, and a voltage value V0 is formed across R1. V0 is directly sent to the built-in CIN pin of the IPM for internal protection logic determination. Among them, the value of R1 usually ranges from 10 mΩ or less. However, limited by the power consumption problem of the sampling resistor, its resistance value is small, the sampled voltage value is small and it is a sensitive analog signal, and it is extremely vulnerable to interference and cause false protection when the current is large.

[0004] CN119543611A discloses a gate drive circuit, a gate drive chip and an electronic device. The gate drive circuit includes an overcurrent protection circuit for sampling the current flowing through a power device to obtain a sampling signal, and when the value of the sampling signal is greater than the value of a first reference signal, controlling the power device to turn off; a current regulation circuit, the current regulation circuit is electrically connected to the overcurrent protection circuit for adjusting the gate drive current of the power device based on the sampling signal to adjust the switching speed and / or current output capacity of the power device. However, this patent needs to add a current regulation circuit, which adjusts the gate drive current of the power device based on the sampling signal of the current on the power device by the overcurrent protection circuit, with high cost and complex circuit, and different circuit principles from the current application. In addition, this patent only has one layer of shutdown protection and does not perform frequency reduction limit processing before shutdown, so the reliability is not high.

[0005] CN119726569A discloses an overcurrent protection circuit, a driving chip, and an intelligent power module. Among them, the overcurrent protection circuit includes a first triode, a second triode, a sampling resistor, a first feedback resistor, a second feedback resistor, a first comparator, a second comparator, a first NOT gate, a first NAND gate, and a blanking circuit. The blanking circuit is used to eliminate the noise interference of the driving chip. In the overcurrent protection circuit of the present invention, the signal is first amplified by the first triode and the second triode at the front stage, then compared by the first comparator and the second comparator, and finally the noise interference is eliminated by the blanking circuit. However, this patent only has one layer of shutdown protection and does not perform frequency reduction limiting before shutdown, so the reliability is not high.

[0006] CN109203914A discloses a control system for an automotive air-conditioning electric compressor, including a microprocessor module, a data acquisition module, an operational amplifier module, a comparator module, and a driving module. The microprocessor module is respectively connected to the data acquisition module, the operational amplifier module, the comparator module, and the driving module. The data acquisition module is connected to the comparator module through the operational amplifier module. The control system further includes a low-voltage power supply module and a high-voltage power supply module. The low-voltage power supply module is respectively connected to the microprocessor module, the operational amplifier module, and the driving module. The high-voltage power supply module is respectively connected to the data acquisition module and the driving module. However, this patent needs to additionally increase an isolation circuit, resulting in high costs. Moreover, this patent only has one layer of shutdown protection and does not perform frequency reduction limiting before shutdown, so the reliability is not high. Summary of the Invention

[0007] To solve the deficiencies in the prior art such as high cost, complex circuit, and low reliability, the present invention provides an anti-interference protection circuit, method, and air conditioner for the power devices of an air-conditioning compressor.

[0008] The present invention adopts the following technical solutions.

[0009] On the one hand, the present invention discloses an anti-interference protection circuit for the power devices of an air-conditioning compressor, including a current signal acquisition module, a differential amplification module, a protection judgment module, and a control chip:

[0010] The current signal acquisition module is connected to the current output pin of the intelligent power module IPM of the air-conditioning compressor to collect the total current of the IPM;

[0011] The collected total current signal is differentially amplified by the differential amplification module; the protection judgment module outputs classification protection signals to the CIN pin of the IPM and the control chip based on the differentially amplified total current signal;

[0012] The control chip issues corresponding control signals to the intelligent power module IPM of the air-conditioning compressor based on the classification protection signals.

[0013] Further preferably,

[0014] The current signal acquisition module is a sampling resistor, and the value range of the sampling resistor is 0 to 20 mΩ; the total current of the IPM is converted into a sampling voltage.

[0015] Further preferably,

[0016] The differential amplification module is an operational amplifier, and the value range of its amplification factor is [1, 10].

[0017] Further preferably,

[0018] The protection judgment module includes a comparator module and a triode;

[0019] The first input end of the comparator module is connected to the output end of the differential amplifier, and the output end of the comparator module is connected to the base of the triode;

[0020] The comparator module compares the output result of the differential amplifier with a set value, and controls the conduction or cutoff of the triode according to the comparison result.

[0021] Further preferably,

[0022] The set value Y satisfies 0.5VCC ≤ Y ≤ 0.9VCC, where VCC is the high level.

[0023] Further preferably,

[0024] The comparator module includes a first resistor, a second resistor and a comparator;

[0025] The first end of the first resistor R3 is connected to the high level VCC, the second end is connected to the second input end of the comparator, and the first end of the second resistor R4; the second end of the second resistor is grounded;

[0026] The set value Y of the comparator module is shown in the following formula:

[0027]

[0028] Further preferably,

[0029] The comparator module compares the output result of the differential amplifier with the set value, and controls the conduction or cutoff of the triode according to the comparison result, that is, when xV0 ≥ Y, the comparator outputs a high level, and at this time the triode conducts; otherwise, the comparator outputs a low level and the triode cuts off; where x is the amplification factor of the differential amplification module; V0 is the voltage value of the total current signal collected applied to the sampling resistor; Y is the set value of the comparator.

[0030] Further preferably,

[0031] The protection judgment module outputs classification protection signals to the CIN pin of the IPM and the control chip based on the total current signal after differential amplification, including:

[0032] The protection judgment module outputs the output signal of the transistor emitter to the first signal input pin of the control chip and outputs the differentially amplified signal to the second signal input pin of the control chip;

[0033] The protection judgment module outputs the output signal of the transistor emitter to the CIN pin of the IPM.

[0034] Further preferably,

[0035] When the output of the transistor emitter is high level, double shutdown protection of the IPM and the control chip is performed, including:

[0036] The IPM turns off all switches, the control chip inputs signals to the insulated gate bipolar transistor IGBT, and there is no output in the three phases of UVW;

[0037] The control chip turns off all pulse width modulation waves.

[0038] Further preferably,

[0039] Connect the output end of the differential amplification module to the second signal input pin of the control chip and output the differentially amplified signal to the control chip.

[0040] Further preferably,

[0041] The control chip issues corresponding control signals to the intelligent power module IPM of the air-conditioning compressor based on the classification protection signals, including:

[0042] When Vin < V1, the unit operates normally; where Vin is the amplified sampled voltage; V1 is the set frequency limit value;

[0043] When V1 ≤ Vin < V2, the unit operates at the current frequency; where V2 is the set frequency reduction value;

[0044] When Vin ≥ V2, the unit operates at a reduced frequency;

[0045] When the unit operates at a reduced frequency, the frequency of the unit is reduced to the set first frequency for operation, and every set first time, it is judged whether V1 ≤ Vin < V2 is satisfied;

[0046] If so, the unit operates at the current frequency;

[0047] If not, based on the current unit frequency, the set second frequency is reduced, and it is continuously judged whether V1 ≤ Vin < V2 is satisfied until the judgment result is yes or the unit frequency is reduced to the set third frequency.

[0048] On the other hand, the present invention discloses an anti-interference protection method based on an anti-interference protection circuit, including:

[0049] Step 1: Collect the total current of the intelligent power module IPM;

[0050] Step 2: Differentially amplify the collected total current signal, and output a classification protection signal to the IPM and the control chip based on the differentially amplified total current signal;

[0051] Step 3: The control chip issues a corresponding control signal to the intelligent power module of the air-conditioning compressor based on the classification protection signal.

[0052] On the other hand, the present invention discloses an air conditioner, which includes the anti-interference protection circuit, and the anti-interference protection circuit is arranged at the IPM of the compressor.

[0053] The present application also discloses a computer-readable storage medium, on which a computer program is stored. It is characterized in that when the program is executed by a processor, the anti-interference protection method is implemented.

[0054] The beneficial effect of the present invention is that, compared with the prior art:

[0055] The present invention proposes an anti-interference power device protection circuit, which amplifies the weak signal sampled by the operational amplifier current, and then compares the sampled value with the set value through a comparator for output. At the output end of the comparator, it is connected to the CIN pin of the IPM through a triode to solve the problem of false protection caused by interference. At the same time, the present invention also performs a frequency reduction limit processing before shutdown to improve the operation reliability of the unit. Description of the Drawings

[0056] Figure 1 It is a general view of the IPM protection of the conventional compressor drive circuit;

[0057] Figure 2 It is a general view of an anti-interference protection circuit for the power device of an air-conditioning compressor. Detailed Embodiments

[0058] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the spirit of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0059] The present application discloses an anti-interference protection circuit for the power device of an air-conditioning compressor, including a current signal acquisition module, a differential amplification module, a protection judgment module and a control chip.

[0060] The current signal acquisition module is connected to the current output pin of the intelligent power module IPM of the air conditioner compressor to collect the total current of the IPM;

[0061] The current signal acquisition module is a sampling resistor, and the value range of the sampling resistor is 0 to 20 mΩ; the total current of the IPM is converted into a sampling voltage.

[0062] The collected total current signal is differentially amplified by a differential amplification module; the differential amplification module is an operational amplifier, and the value range of its amplification factor is [1, 10].

[0063] The protection judgment module outputs a classification protection signal to the CIN pin of the IPM and the control chip based on the differentially amplified total current signal;

[0064] The protection judgment module includes a comparator module and a triode;

[0065] The first input end of the comparator module is connected to the output end of the differential amplifier, and the output end of the comparator module is connected to the base of the triode;

[0066] The comparator module compares the output result of the differential amplifier with a set value, and controls the conduction or cut-off of the triode according to the comparison result. The set value Y satisfies 0.5VCC ≤ Y ≤ 0.9VCC, where VCC is the high level.

[0067] The comparator module includes a first resistor, a second resistor and a comparator;

[0068] The first end of the first resistor R3 is connected to the high level VCC, the second end is connected to the second input end of the comparator, and the first end of the second resistor R4; the second end of the second resistor is grounded;

[0069] The set value Y of the comparator module is shown as the following formula:

[0070]

[0071] The sampling resistor R5, the first resistor R3 and the second resistor R4 satisfy the following formula:

[0072]

[0073] Where, I is the overcurrent protection threshold current; x is the amplification factor of the differential amplification module.

[0074] The comparator module compares the output result of the differential amplifier with a set value and controls the conduction or cutoff of the triode according to the comparison result. That is, when xV0≥Y, the comparator outputs a high level, and at this time the triode conducts; otherwise, the comparator outputs a low level and the triode cuts off. Here, x is the amplification factor of the differential amplification module; V0 is the voltage value of the total current signal collected across the sampling resistor; and Y is the set value of the comparator.

[0075] The protection judgment module outputs classification protection signals to the CIN pin of the IPM and the control chip based on the total current signal after differential amplification, including:

[0076] Connect the output terminal of the differential amplification module to the second signal input pin of the control chip and output the differentially amplified signal to the control chip.

[0077] The protection judgment module outputs the output signal of the triode emitter to the first signal input pin of the control chip and outputs the differentially amplified signal to the second signal input pin of the control chip;

[0078] The protection judgment module outputs the output signal of the triode emitter to the CIN pin of the IPM.

[0079] When the output of the triode emitter is at a high level, double shutdown protection of the IPM and the control chip is performed, including:

[0080] The IPM turns off all switches, the control chip inputs signals to the insulated gate bipolar transistor IGBT, and there is no output in the three phases of UVW;

[0081] The control chip turns off all pulse width modulation waves.

[0082] The control chip issues corresponding control signals to the intelligent power module IPM of the air-conditioning compressor based on the classification protection signals.

[0083] The control chip issues corresponding control signals to the intelligent power module IPM of the air-conditioning compressor based on the classification protection signals, including:

[0084] When Vin<V1, the unit operates normally; where Vin is the amplified sampled voltage; V1 is the set frequency limit value; preferably, the set frequency limit value

[0085] When V1≤Vin<V2, the unit operates at the current frequency; where V2 is the set frequency reduction value; preferably, the set frequency reduction value

[0086] When Vin≥V2, the unit operates at a reduced frequency; those skilled in the art should know that the normal operating frequency of the unit is about 140Hz.

[0087] The unit operates at a reduced frequency by reducing the unit frequency to a set first frequency and determining whether V1 ≤ Vin < V2 is satisfied every set first time; the first frequency is set as the upper limit of the frequency range for the unit to operate at a reduced frequency. In a preferred embodiment of the present invention, the first frequency is set to 90 Hz. In a preferred embodiment of the present invention, the set first time is 1 minute.

[0088] If so, the unit operates at the current frequency.

[0089] If not, based on the current unit frequency, a set second frequency is reduced, and it is continuously determined whether V1 ≤ Vin < V2 until the determination result is yes or the unit frequency drops to a set third frequency. In a preferred embodiment of the present invention, the second frequency is set to 10 Hz; the third frequency is set as the lower limit of the frequency range for the unit to operate at a reduced frequency. In a preferred embodiment of the present invention, the third frequency is set to 30 Hz.

[0090] Embodiment 1

[0091] As Figure 2 shown, the present application proposes an anti-interference protection circuit for an air conditioner compressor power device. Its basic working principle is as follows:

[0092] The sampling resistor R5 of the present invention is the same as the sampling resistor R1 in the Figure 1 conventional circuit, and both are used to convert the current signal into a voltage signal. The difference is that after the voltage signal V0 is collected in this patent, it is input to the subsequent stage for amplification and comparison, and then sent to the CIN pin and the control chip U2 through a triode. The CIN of the IPM is an input port, and it determines whether it is overcurrent by detecting the analog voltage provided externally. The operating voltage is usually less than 1V and is easily interfered; those skilled in the art should know that: the operating voltage is the minimum voltage required to change the unit from the normal operating state to the overcurrent protection state. Due to factors such as the subsequent stage operational amplifier and comparator circuits, R5 can use a resistor with a smaller resistance value for detection, increasing the flexibility of the R5 selection. Its preferred value range is 0 to 20 mΩ. After the voltage sampling value V0 is detected through R5 in this patent, it first enters the operational amplifier Q1 through the PCB differential circuit for amplification. The amplification factor is set to x, and the amplified signal is xV0; among them, the preferred value range of the amplification factor x is 1 to 10. The set value of the comparator Q2 is denoted as Y, and the calculation formula of Y is: The preferred value range of Y is 50% to 90% VCC, where R3 and R4 are the first and second resistors respectively. The preferred value ranges of the first and second resistors are both 1 kΩ to 100 kΩ, and high-precision resistors can be selected as the first and second resistors; those skilled in the art should know how to configure the resistors according to the set protection value.

[0093] The resistance ratio of resistor R5 to R4 satisfies the following formula:

[0094]

[0095] Where I is the overcurrent protection threshold current. The overcurrent protection threshold current is the maximum current that can pass through the air conditioner compressor drive board and is set by the air conditioner compressor manufacturer. The air conditioner compressor is the air conditioner compressor.

[0096] The output terminal of the comparator is connected to the base of the triode; the collector of the triode is connected to the high level VCC, and the emitter is connected to the ground resistor R2, the CIN pin of the IPM, and the first signal input pin of the control chip; preferably, R2 is 1 kΩ;

[0097] When xV0 ≥ Y, the comparator outputs a high level. At this time, the triode Q3 conducts, the CIN pin detects a high level, the IPM operates, and shuts off all signals from the control chip U2 to the insulated gate bipolar transistor IGBT in the IPM. All switching tubes of the IPM stop working, and there is no output in the UVW three phases of the IPM. When xV0 < Y, the comparator outputs a low level (0 V). At this time, Q3 does not conduct and the CIN pin is forced to be pulled low to 0 V, and there will be no misoperation. Therefore, the CIN pin can only detect two states of 0 and VCC at this time, greatly enhancing the anti-interference ability.

[0098] Preferably, the emitter of the triode Q3 is connected to the ground resistor R2 with a resistance value of 1 kΩ.

[0099] At the same time, the triode transmits the signal to the first signal input pin pin1 of the control chip U2 through another path. When xV0 ≥ Y, the pin1 of U2 detects a high level and turns off all the pulse width modulation PWM waves generated by the control chip U2; when xV0 < Y, the pin1 of U2 detects a low level, and the unit operates normally or is in the state of protected shutdown waiting for restart, achieving double shutdown protection.

[0100] In addition to the above shutdown protection, the unit dynamically adjusts the load current through U2, that is, realizes the frequency reduction limit operation; the load is the air conditioner compressor. The specific method for the unit to dynamically adjust the load current through U2 is as follows:

[0101] The U2 chip sets a frequency limit value V1 and a frequency reduction value V2 through the program; preferably, the frequency limit value is set Frequency reduction value

[0102] When Vin < V1, the unit operates normally; when Vin ≥ V2, the unit of the air conditioner compressor operates at a reduced frequency; when V1 ≤ Vin < V2, the unit maintains the current frequency operation.

[0103] Specifically, for the unit to operate at a reduced frequency, the frequency of the unit is reduced to a set first frequency for operation, and every set first time, it is determined whether V1 ≤ Vin < V2 is satisfied; the first frequency is set as the upper limit of the frequency range for the unit to operate at a reduced frequency. In a preferred embodiment of the present invention, the first frequency is set to 90 Hz. In a preferred embodiment of the present invention, the set first time is 1 minute.

[0104] If so, the unit maintains the current frequency for operation;

[0105] If not, based on the current unit frequency, a set second frequency is reduced, and it continues to be determined whether V1 ≤ Vin < V2 is satisfied until the determination result is yes or the unit frequency drops to a set third frequency. In a preferred embodiment of the present invention, the second frequency is set to 10 Hz; the third frequency is set as the lower limit of the frequency range for the unit to operate at a reduced frequency. In a preferred embodiment of the present invention, the third frequency is set to 30 Hz.

[0106] It should be noted that according to the foregoing content, Vin needs to be less than Otherwise, it will cause the unit to directly shut down for protection. This function is mainly to prevent the unit from directly shutting down. For example, when the ambient temperature is relatively high or the condenser is dirty and blocked, the current increases abnormally, and the unit can operate at a reduced frequency before shutting down for protection.

[0107] This application also discloses an anti-interference protection method based on an anti-interference protection circuit, including:

[0108] Step 1: Collect the total current of the intelligent power module IPM;

[0109] Step 2: Differentially amplify the collected total current signal, and output a classification protection signal to the IPM and the control chip based on the differentially amplified total current signal;

[0110] Step 3: The control chip issues a corresponding control signal to the intelligent power module of the air-conditioning compressor based on the classification protection signal.

[0111] This disclosure may be a system, method, and / or computer program product. The computer program product may include a computer-readable storage medium having computer-readable program instructions thereon for causing a processor to implement various aspects of this disclosure.

[0112] A computer-readable storage medium can be a tangible device that can hold and store instructions for use by an instruction execution device. A computer-readable storage medium can be, for example—but not limited to—an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disc (DVD), a memory stick, a floppy disk, a mechanically encoded device such as a punch card or raised structures in grooves storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage medium as used herein is not construed as being an instantaneous signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., an optical pulse through an optical fiber cable), or an electrical signal transmitted through a wire.

[0113] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to various computing / processing devices, or downloaded to an external computer or external storage device through a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include a copper transmission cable, an optical fiber transmission, a wireless transmission, a router, a firewall, a switch, a gateway computer, and / or an edge server. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in each computing / processing device.

[0114] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state-setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages such as Smalltalk, C++, etc., and conventional procedural programming languages such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider). In some embodiments, by using the state information of the computer-readable program instructions to customize an electronic circuit, such as a programmable logic circuit, a field-programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit can execute the computer-readable program instructions to implement various aspects of the present disclosure.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent substitutions can still be made to the specific embodiments of the present invention, and any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. An anti-interference protection circuit for an air-conditioning compressor power device, comprising a current signal acquisition module, a differential amplification module, a protection judgment module, and a control chip; characterized in that: The current signal acquisition module is connected to the current output pin of the intelligent power module IPM of the air-conditioning compressor to collect the total current of the IPM; The collected total current signal is differentially amplified by the differential amplification module; The protection judgment module outputs classified protection signals to the CIN pin of the IPM and the control chip based on the differentially amplified total current signal; The control chip issues corresponding control signals to the intelligent power module IPM of the air-conditioning compressor based on the classified protection signals.

2. The anti-interference protection circuit according to claim 1, characterized in that: The current signal acquisition module is a sampling resistor, and the value range of the sampling resistor is 0 to 20 mΩ; the total current of the IPM is converted into a sampling voltage.

3. The anti-interference protection circuit according to claim 1, characterized in that: The differential amplification module is an operational amplifier, and the value range of its amplification factor is [1, 10].

4. The anti-interference protection circuit according to claim 1, characterized in that: The protection judgment module includes a comparator module and a triode; The first input end of the comparator module is connected to the output end of the differential amplifier, and the output end of the comparator module is connected to the base of the triode; The comparator module compares the output result of the differential amplifier with a set value, and controls the conduction or cut-off of the triode according to the comparison result.

5. The anti-interference protection circuit according to claim 4, characterized in that: The set value Y satisfies 0.5VCC ≤ Y ≤ 0.9VCC, where VCC is the high level.

6. The anti-interference protection circuit according to claim 4 or 5, characterized in that: The comparator module includes a first resistor, a second resistor, and a comparator; The first end of the first resistor R3 is connected to the high level VCC, the second end is connected to the second input end of the comparator, and the first end of the second resistor R4; the second end of the second resistor is grounded; The set value Y of the comparator module is shown as follows:

7. The anti-interference protection circuit according to claim 1 or 2 or 4, characterized in that: The comparator module compares the output result of the differential amplifier with a set value, and controls the conduction or cut-off of the triode according to the comparison result, that is, when xV0 ≥ Y, the comparator outputs a high level, and at this time the triode conducts; otherwise, the comparator outputs a low level, and the triode cuts off; where x is the amplification factor of the differential amplification module; V0 is the voltage value of the collected total current signal applied to the sampling resistor; Y is the set value of the comparator.

8. The anti-interference protection circuit according to claim 1 or 4, characterized in that: The protection judgment module outputs classified protection signals to the CIN pin of the IPM and the control chip based on the differentially amplified total current signal, including: The protection judgment module outputs the output signal of the triode emitter to the first signal input pin of the control chip, and outputs the differentially amplified signal to the second signal input pin of the control chip; The protection judgment module outputs the output signal of the triode emitter to the CIN pin of the IPM.

9. The anti-interference protection circuit according to claim 8, wherein: When the emitter output of the triode is at a high level, dual shutdown protection of the IPM and the control chip is performed, including: The IPM turns off all switches, the control chip inputs signals to the insulated gate bipolar transistor IGBT, and there is no output in the three phases of UVW; The control chip turns off all pulse width modulation waves.

10. The anti-interference protection circuit according to claim 1, wherein: The output end of the differential amplification module is connected to the second signal input pin of the control chip, and the differentially amplified signal is output to the control chip.

11. The anti-interference protection circuit according to claim 1 or 2 or 10, wherein: The control chip issues corresponding control signals to the intelligent power module IPM of the air-conditioning compressor based on the classification protection signals, including: When Vin < V1, the unit operates normally; wherein, Vin is the amplified sampled voltage; V1 is the set frequency limit value; When V1 ≤ Vin < V2, the unit operates at the current frequency; wherein, V2 is the set frequency reduction value; When Vin ≥ V2, the unit operates at a reduced frequency; When the unit operates at a reduced frequency, the frequency of the unit is reduced to the set first frequency for operation, and every set first time, it is judged whether V1 ≤ Vin < V2 is satisfied; If so, the unit operates at the current frequency; If not, based on the current unit frequency, the set second frequency is reduced, and it is continuously judged whether V1 ≤ Vin < V2 is satisfied until the judgment result is yes or the unit frequency is reduced to the set third frequency.

12. An anti-interference protection method using the anti-interference protection circuit according to any one of claims 1-11, characterized in that, Including: Step 1: Collect the total current of the intelligent power module IPM; Step 2: Differentially amplify the collected total current signal, and output classification protection signals to the IPM and the control chip based on the differentially amplified total current signal; Step 3: The control chip issues corresponding control signals to the intelligent power module of the air-conditioning compressor based on the classification protection signals.

13. An air conditioner, the air conditioner includes the anti-interference protection circuit according to any one of claims 1-11, and the anti-interference protection circuit is arranged at the IPM of the compressor.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, the steps of the anti-interference protection method according to claim 12 are implemented.

Images