Control method of motor and resonant heating, vehicle-mounted compressor and vehicle

Abstract

This application discloses a control method for a motor and resonant heating, an on-board compressor, and a vehicle, relating to the field of motor control and resonant heating technology. It is applied to a compressor controller connected to a motor and equipped with a three-phase inverter circuit and a resonant heating circuit. The resonant heating circuit is connected in series with any one of the inverter half-bridges in the three-phase inverter circuit. The method acquires the control parameter information of the compressor controller at the current moment, including the first circuit parameters of the three-phase inverter circuit, the second circuit parameters of the resonant heating circuit, and the input desired heating power. The theoretical heating power is determined based on the desired heating power, the first circuit parameters, and the second circuit parameters, and the actual heating power is determined based on the first circuit parameters and the second circuit parameters. The actual carrier frequency is determined based on the theoretical heating power and the actual heating power, and the motor and resonant heating circuit are controlled based on the actual carrier frequency. This application reduces the implementation cost of motor control and heating functions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor control and resonant heating, and particularly relates to a motor and resonant heating control method, a vehicle-mounted compressor and a vehicle. BACKGROUND

[0002] With the application of motor control and heating technology in different fields becoming more and more extensive, users also put forward higher requirements on the implementation mode of motor control and heating function.

[0003] The implementation mode of the traditional motor control and heating function is to heat through a PTC (Positive Temperature Coefficient, positive temperature coefficient resistor) heater, and to adjust the PTC heating based on a vehicle-mounted PTC heater controller changing the number of switches or adjusting the switch duty cycle. Meanwhile, an inverter circuit and a motor controller need to be used separately to realize motor control. This implementation mode of motor control and heating function has great defects. The implementation of motor control and heating function needs to use respective controllers and control circuits (including a PTC heater, a vehicle-mounted PTC heater controller, a motor controller and an inverter circuit). That is, this implementation mode of motor control and heating function will cause the implementation cost of motor control and heating function to be relatively high due to the need to use respective controllers and control circuits for the implementation of motor control and heating function.

[0004] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The main purpose of the present application is to provide a motor and resonant heating control method, a vehicle-mounted compressor and a vehicle, aiming to solve the technical problem of high implementation cost of motor control and heating function.

[0006] To achieve the above purpose, the present application provides a motor and resonant heating control method, which is applied to a compressor controller connected with a motor. A three-phase inverter circuit and a resonant heating circuit are arranged in the compressor controller. The resonant heating circuit is connected in series with any one of the three-phase inverter circuits. The motor and resonant heating control method comprises the following steps:

[0007] obtaining control parameter information of the compressor controller at the current time, wherein the control parameter information comprises a first circuit parameter of the three-phase inverter circuit, a second circuit parameter of the resonant heating circuit and an input expected heating power;

[0008] The theoretical heating power is determined based on the desired heating power, the first circuit parameters, and the second circuit parameters, and the actual heating power is determined based on the first circuit parameters and the second circuit parameters.

[0009] The actual carrier frequency is determined based on the theoretical heating power and the actual heating power, and the motor and the resonant heating circuit are controlled based on the actual carrier frequency.

[0010] In one embodiment, the first circuit parameters include the bus voltage of the three-phase inverter circuit, the turn-on time of the target switch in the three-phase inverter circuit, and the current carrier frequency, wherein the target switch includes a switch connected in series with the resonant heating circuit, and the second circuit parameters include the equivalent resistance in the resonant heating circuit. The step of determining the theoretical heating power based on the desired heating power, the first circuit parameters, and the second circuit parameters includes:

[0011] Determine a first product value between the bus voltage, the current carrier frequency, and the turn-on time, and determine a first ratio of the square of the first product value to the equivalent resistance;

[0012] When the desired heating power is greater than the first ratio, the first ratio is taken as the theoretical heating power;

[0013] When the desired heating power is less than or equal to the first ratio, the desired heating power is taken as the theoretical heating power.

[0014] In one embodiment, the second circuit parameters include the resonant frequency and quality factor of the resonant heating circuit, and the step of determining the actual heating power based on the first circuit parameters and the second circuit parameters includes:

[0015] The equivalent resistance, the resonant frequency, and the quality factor are input into a preset impedance amplitude formula to determine the impedance amplitude of the resonant heating circuit.

[0016] A first product value is determined between the bus voltage, the carrier frequency, and the turn-on time, and a second ratio of the square of the first product value to the impedance amplitude is determined as the actual heating power.

[0017] In one embodiment, the step of determining the actual carrier frequency based on the theoretical heating power and the actual heating power includes:

[0018] The power deviation between the theoretical heating power and the actual heating power is determined, and the actual carrier frequency is obtained by proportional integration based on the power deviation.

[0019] In one embodiment, after the step of determining the actual carrier frequency based on the theoretical heating power and the actual heating power, the method further includes:

[0020] The actual carrier frequency is used as the current carrier frequency, and the control parameter information of the compressor controller at the next moment is updated based on the current carrier frequency.

[0021] In one embodiment, after the step of determining the actual carrier frequency based on the theoretical heating power and the actual heating power, the method further includes:

[0022] The resonant heating circuit is controlled based on the actual carrier frequency.

[0023] Determine the waveform duty cycle corresponding to the actual carrier frequency, and control the motor based on the waveform duty cycle.

[0024] In addition, to achieve the above objectives, a vehicle-mounted compressor is provided, which includes a compressor controller, a motor, and a compression unit. The compressor controller is connected to the motor, and the motor is connected to the compression unit. The compressor controller is provided with a three-phase inverter circuit and a resonant heating circuit. The resonant heating circuit is connected in series with any one of the inverter half-bridges in the three-phase inverter circuit. The output terminal of the three-phase inverter circuit is connected to the motor. The compressor controller executes the motor and resonant heating control method described above.

[0025] In one embodiment, the resonant heating circuit includes:

[0026] Equivalent resistance, the first end of which is connected to the first end of any one of the inverter half-bridges in the three-phase inverter circuit;

[0027] A resonant capacitor, wherein the first terminal of the resonant capacitor is connected to the second terminal of the equivalent resistor;

[0028] A resonant inductor, the first end of which is connected to the second end of the resonant capacitor, and the second end of which is connected to the second end of any one of the inverter half-bridges in the three-phase inverter circuit.

[0029] In one embodiment, the three-phase inverter circuit includes a first inverter bridge arm, a second inverter bridge arm, and a third inverter bridge arm, wherein the inverter half-bridge of the first inverter bridge arm, the inverter half-bridge of the second inverter bridge arm, or the inverter half-bridge of the third inverter bridge arm is connected to the resonant heating circuit.

[0030] In one embodiment, the motor includes a first phase input terminal, a second phase input terminal, and a third phase input terminal, and the three-phase inverter circuit includes:

[0031] Motor controller;

[0032] The first end of the first inverter bridge arm is connected to the positive terminal of the external power supply, the second end of the first inverter bridge arm is connected to the negative terminal of the external power supply, and the midpoint of the first inverter bridge arm is connected to the first phase input terminal.

[0033] The first end of the second inverter bridge arm is connected to the positive terminal of the external power supply, the second end of the second inverter bridge arm is connected to the negative terminal of the external power supply, and the midpoint of the second inverter bridge arm is connected to the second phase input terminal.

[0034] The third end of the third inverter bridge arm is connected to the positive terminal of the external power supply, the second end of the third inverter bridge arm is connected to the negative terminal of the external power supply, and the midpoint of the third inverter bridge arm is connected to the third phase input terminal. The first inverter bridge arm, the second inverter bridge arm, and the third inverter bridge arm are composed of two series-connected switching transistors, and the control terminal of the switching transistors is connected to the motor controller. The external power supply is used to provide bus voltage.

[0035] In addition, to achieve the above objectives, a vehicle is also provided, the vehicle including the aforementioned on-board compressor.

[0036] This application provides a control method for a motor and resonant heating, applied to a compressor controller connected to a motor. The compressor controller includes a three-phase inverter circuit and a resonant heating circuit. The resonant heating circuit is connected in series with any one of the inverter half-bridges in the three-phase inverter circuit. The method acquires control parameter information of the compressor controller at the current moment, including first circuit parameters of the three-phase inverter circuit, second circuit parameters of the resonant heating circuit, and the input desired heating power. The theoretical heating power is determined based on the desired heating power, the first circuit parameters, and the second circuit parameters, and the actual heating power is determined based on the first circuit parameters and the second circuit parameters. The actual carrier frequency is determined based on the theoretical heating power and the actual heating power, and the motor and resonant heating circuit are controlled based on the actual carrier frequency. This control method for a motor and resonant heating is applied in a compressor controller where the resonant heating circuit and any one of the inverter half-bridges in the three-phase inverter circuit are connected in series. The method uses the desired heating power, the first circuit parameters, and the input desired heating power to determine the theoretical heating power and the actual heating power. The theoretical heating power is determined by the second circuit parameters, and the actual heating power is determined by the first and second circuit parameters. The actual carrier frequency is then determined based on the theoretical and actual heating power to control the motor and the resonant heating circuit. This avoids the need for separate controllers and control circuits (including a PTC heater, an on-board PTC heater controller, a motor controller, and an inverter circuit) for motor control and heating functions. By connecting the resonant heating circuit in series with any one of the inverter half-bridges in the three-phase inverter circuit, the theoretical and actual heating power are determined based on the desired heating power, the first and second circuit parameters, and the actual carrier frequency is then determined based on these parameters to control the motor and the resonant heating circuit. This reduces the use of the PTC heater (replacing it with a resonant heating circuit), the on-board PTC heater controller, and the PTC heater control circuit, thereby lowering the cost of implementing motor control and heating functions. Attached Figure Description

[0037] Figure 1 This is a flowchart illustrating the first embodiment of the control method for motor and resonant heating according to this application;

[0038] Figure 2 A schematic diagram of the connection of an existing heating control circuit;

[0039] Figure 3 This is an equivalent schematic diagram of an existing heating control circuit.

[0040] Figure 4 This is a waveform diagram of a carrier wave and power in the resonant heating circuit of this application;

[0041] Figure 5 This is a schematic diagram of a scenario for the control method of the motor and resonant heating in this application;

[0042] Figure 6 This is a schematic diagram of a control method for motor and resonant heating according to this application;

[0043] Figure 7 This is a schematic diagram of the controller structure of the hardware operating environment involved in the embodiments of the present invention;

[0044] Figure 8 This is a schematic diagram of the controller module of the present invention;

[0045] Figure 9 This is a schematic diagram showing the connection between the three-phase inverter circuit and the resonant heating circuit within the compressor controller of this application.

[0046] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0047] Explanation of icon numbers:

[0048] Vdc, external power supply; 21, first inverter bridge arm; 22, second inverter bridge arm; 23, third inverter bridge arm; 10, resonant heating circuit; M, motor; S1, first switch; S2, second switch; S3, third switch; S4, fourth switch; S5, fifth switch; S6, sixth switch; S7, turn-on switch; R1, equivalent resistance; C1, resonant capacitor; L1, resonant inductor; RX, equivalent sampling resistor; RV, second sampling resistor; RU, third sampling resistor; W, first phase input terminal; V, second phase input terminal; U, third phase input terminal; Li, limiter; K, adder; PI, proportional-integral unit; Y, arithmetic unit. Detailed Implementation

[0049] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0050] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0051] PTC material is a semiconductor material with a positive temperature coefficient, meaning its resistance increases with temperature. PTC heaters are commonly used electric heating devices in new energy vehicles, utilizing the properties of PTC material to provide heating for the vehicle interior, seats, and battery through current heating. Traditional PTC heaters typically use only one power switch to control the PTC. If the power device short-circuits during heating, the fuse generally won't burn out, and the PTC heater will continue to burn dry, leading to high-temperature safety hazards and affecting the vehicle's range. Because the PTC heater controller is relatively simple, and the electric compressor itself can also perform heating functions, the presence of components with redundant functions in the vehicle system effectively increases component costs. Furthermore, referring to... Figure 2 , Figure 2 This is a connection diagram of an existing heating control circuit, including an external power supply Vdc, a control topology consisting of a first switching transistor S1 and a second switching transistor S2, wherein the resonant capacitor C1 and the resonant inductor Leq (which includes the heating coil and the equivalent resistance R1 of the heated object in the diagram) constitute the resonant heating circuit. Further details can be found in [reference needed]. Figure 3 , Figure 3 This is an equivalent schematic diagram of an existing heating control circuit. When the resonant heating circuit is working, the equivalent circuit is shown in the figure to achieve resonant heating. In this diagram, the resonant heating circuit is working when the parallel-connected switches are off and the series-connected switches are on. However, the control drawback of the above resonant heating circuit is that the control topology and the inverter circuit controlling the motor itself need to be set up separately. For a three-phase inverter circuit, this control topology contains 2 switches, while the three-phase inverter circuit contains 6 switches. This results in higher implementation costs for the devices that need to control the motor and heat. Furthermore, the separate arrangement of the two control circuits increases the overall device footprint, requiring more space for circuit arrangement due to the increased number of switches, thus requiring larger devices.

[0052] Therefore, based on the shortcomings of the above-mentioned methods for implementing motor control and heating functions, this application proposes a control method for motor and resonant heating: The method involves connecting the resonant heating circuit in series with any one of the inverter half-bridges in the three-phase inverter circuit. The theoretical heating power is determined by the desired heating power, first circuit parameters, and second circuit parameters. Simultaneously, the actual heating power is determined based on the first and second circuit parameters. After determining the actual carrier frequency based on the theoretical and actual heating power, the motor and resonant heating circuit are controlled. This avoids the need for separate controllers and control circuits (including PTC heater, vehicle-mounted PTC heater controller, motor controller, and inverter circuit) for implementing motor control and heating functions. By connecting the resonant heating circuit in series with any one of the inverter half-bridges in the three-phase inverter circuit, and then determining the theoretical and actual heating power based on the desired heating power, first circuit parameters, and second circuit parameters, the actual carrier frequency is determined based on the theoretical and actual heating power before controlling the motor and resonant heating circuit. This reduces the use of the PTC heater (replacing it with the resonant heating circuit), the vehicle-mounted PTC heater controller, and the PTC heater control circuit, thereby reducing the implementation cost of motor control and heating functions.

[0053] In one embodiment of this application, reference is made to Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the motor and resonant heating control method of this application. The motor and resonant heating control method is applied to a compressor controller connected to a motor M. The compressor controller is equipped with a three-phase inverter circuit 20 and a resonant heating circuit 10. The resonant heating circuit 10 is connected in series with any one of the inverter half-bridges in the three-phase inverter circuit 20. The motor and resonant heating control method includes:

[0054] Step S10: Obtain the control parameter information of the compressor controller at the current moment, wherein the control parameter information includes the first circuit parameters of the three-phase inverter circuit, the second circuit parameters of the resonant heating circuit, and the input desired heating power;

[0055] For example, a compressor controller connected to a motor M includes a three-phase inverter circuit 20 and a resonant heating circuit 10. The resonant heating circuit 10 is connected in series with any one of the inverter half-bridges in the three-phase inverter circuit 20. Therefore, the control of the motor M and the resonant heating circuit 10 can be achieved based on the control of the three-phase inverter circuit 20 itself, thus realizing resonant heating and reducing the cost of implementing motor control and heating functions. However, how to achieve coordinated control between the motor M and the resonant heating circuit 10 becomes a challenge that needs to be overcome.

[0056] A control analysis is performed on the resonant heating circuit 10, which consists of resistors, capacitors, and inductors. Assuming the resistance is R, the inductance is L, and the capacitance is C, the total impedance of the resonant heating circuit 10 can be determined as Z = R + j(wL - 1 / wC), where w is the carrier angular frequency of the PWM (Pulse Width Modulation) wave in the three-phase inverter circuit 20, and the carrier angular frequency w = 2πf = 2π / T, where f is the carrier frequency of the PWM and T is the carrier period of the PWM. Simultaneously, the resonant angular frequency wr = 1 / √LC, the resonant frequency fr = 1 / 2π√LC, and the quality factor Q = wrL / R = 1 / wrRC can be determined. Therefore, the total impedance can be expressed based on the total impedance formula and the quality factor.

[0057]

[0058] Then, determine the magnitude of the total impedance based on formula (1):

[0059]

[0060] Because the amplitude of the input voltage Vdc of the series resonant heating circuit 10 is an asymmetrical square wave, the duty cycle of the square wave is α = Ta / T, 0 ≤ α ≤ 1, where T is the carrier period of the PWM, and Ta is the on-time of the switching transistor of the half-bridge containing the resonant heating circuit 10 during the carrier period. That is, the relationship between Ta and the voltage is:

[0061]

[0062] Where U0(t) is the control voltage of the switching transistor in the half-bridge of the resonant heating circuit 10, the square wave in one carrier cycle is expanded by Fourier series. Ignoring the fundamental and higher harmonic components and retaining only the DC component, we can determine that U0(t) ≈ αVdc = Ta*Vdc / T. Therefore, the output power of the resonant heating circuit 10 in one carrier cycle can be determined as:

[0063]

[0064] Within one electrical cycle, the output power of the resonant heating circuit 10 is equal to the sum of all square wave output powers within the electrical cycle (i.e., one electrical cycle includes multiple carrier cycles), that is, the output power within one electrical cycle is:

[0065]

[0066] Where Tai is the turn-on time of the power device in the half-bridge of the series resonant circuit within each carrier cycle, which can be understood as the duty cycle. Based on the analysis of formula (4), the induction heating power of the resonant heating circuit 10 is mainly determined by three key factors, namely the bus voltage Vdc, the carrier frequency f of the PWM, and the turn-on time Ta of the half-bridge power device (without considering its own resistance value R, inductance value L, and capacitance value C). At this time, the output power T0 of the carrier cycle can be changed by adjusting the bus voltage Vdc, the carrier frequency f of the PWM, and the turn-on time Ta of the half-bridge power device. At the same time, the output power T0 of the carrier cycle is also related to the resonant frequency fr. When the carrier frequency f is equal to the resonant frequency fr, the output power of induction heating reaches the maximum value (assuming that the bus voltage Vdc, the carrier frequency f of the PWM, and the turn-on time Ta of the half-bridge power device are slightly different). When it is lower than the resonant frequency, the heating power increases with the increase of the carrier frequency, and when it is higher than the resonant frequency, the heating power decreases with the increase of the carrier frequency. Further, refer to Figure 4 , Figure 4 This diagram illustrates the waveform of a carrier wave and power in the resonant heating circuit of this application. A suitable resonant frequency *fr* can be designed by changing the inductance value *L* and the capacitance value *C*. Within the variation range of the carrier frequency *f*, a monotonically increasing or monotonically decreasing "output power P0 - carrier frequency *f*" characteristic curve can be obtained. Alternatively, a suitable quality factor *Q* of the resonant circuit can be designed to change the slope of the "output power P0 - carrier frequency *f*" characteristic curve, i.e., to change the rate of change of the output power *P0 - carrier frequency *f*. In practical applications, the motor is usually required to operate stably at a given target speed under a certain voltage. Therefore, the bus voltage and motor speed are not used as control quantities for the induction heating power. The output power *P0* of the induction heating is mainly adjusted by changing the carrier frequency *f*. Therefore, this application proposes a method for controlling the output power *P0* based on the carrier frequency *f*.

[0067] In this embodiment, based on the above analysis of output power P0 control, a control method for motor and resonant heating is proposed. This method is primarily used in scenarios where motor and resonant heating are controlled simultaneously or separately. In these cases, the control method for motor and resonant heating can be implemented using a separate controller or integrated into the motor controller. By acquiring the control parameter information of the compressor controller at the current moment—that is, acquiring information about each circuit or device within the compressor controller, such as current and voltage values—the control parameter information includes the first circuit parameters of the three-phase inverter circuit, the second circuit parameters of the resonant heating circuit, and the input desired heating power. The first circuit parameters refer to relevant parameters of the three-phase inverter circuit, such as the bus voltage of the three-phase inverter circuit, the duty cycle of the control signal for each phase circuit, and the carrier frequency at the current moment. The second circuit parameters refer to parameters in the resonant heating circuit, such as the parameters of resistance, inductance, and capacitance. The desired heating power refers to the power that the user wants the resonant heating circuit to heat. Therefore, control can be performed based on the control parameter information to achieve resonant heating, reducing the implementation cost of motor control and heating functions and ensuring control accuracy.

[0068] Step S20: Determine the theoretical heating power based on the desired heating power, the first circuit parameters, and the second circuit parameters; and determine the actual heating power based on the first circuit parameters and the second circuit parameters.

[0069] Step S30: Determine the actual carrier frequency based on the theoretical heating power and the actual heating power, so as to control the motor and the resonant heating circuit based on the actual carrier frequency.

[0070] In this embodiment, after obtaining the control parameter information, the theoretical heating power is determined based on the expected heating power, the first circuit parameter, and the second circuit parameter in the control parameter information. The theoretical heating power refers to the theoretically achievable heating power. For example, if the maximum heating power of the resonant heating circuit is A, and the expected heating power is A+1, then the theoretical heating power is determined to be A, thus ensuring the accuracy of subsequent control. Simultaneously, the actual heating power can also be determined based on the first and second circuit parameters, that is, the heating power that the actual parameters can achieve. The steps of determining the theoretical heating power and the actual heating power are not required to be in any particular order. Then, the difference between the two powers can be determined, and the actual carrier frequency can be obtained by performing relevant feedback calculations based on this difference. At this point, different carrier frequencies corresponding to different differences can be defined in the feedback calculation, and the required carrier frequency can be adjusted for different differences. The motor and the resonant heating circuit can then be controlled based on the actual carrier frequency. The entire hardware implementation only requires adding a half-bridge series resonant heating circuit 10 and improving the existing motor control method. A single controller can be used to achieve both motor field-oriented control and induction heating functions. The hardware topology is simple, reducing component costs, simplifying the control method, and lowering the difficulty of software development. Meanwhile, the power devices in the three-phase inverter circuit have soft-switching characteristics of zero-voltage switching and zero-current switching, reducing switching losses and electromagnetic interference. Since there are two power devices in the bridge arm where the resonant heating circuit is located, it is extremely rare for both power devices to short-circuit simultaneously. If one power device short-circuits, the resonant heating circuit will not continue to burn dry, thus overcoming the high-temperature safety hazards of PTC heaters to some extent.

[0071] In one embodiment, a control method for a motor and resonant heating is provided, applied to a compressor controller connected to a motor. The compressor controller includes a three-phase inverter circuit and a resonant heating circuit. The resonant heating circuit is connected in series with any one of the inverter half-bridges in the three-phase inverter circuit. The method acquires control parameter information of the compressor controller at the current moment, including first circuit parameters of the three-phase inverter circuit, second circuit parameters of the resonant heating circuit, and the input desired heating power. A theoretical heating power is determined based on the desired heating power, the first circuit parameters, and the second circuit parameters, and an actual heating power is determined based on the first and second circuit parameters. An actual carrier frequency is determined based on the theoretical heating power and the actual heating power, and the motor and resonant heating circuit are controlled based on the actual carrier frequency. This control method for a motor and resonant heating is applied in a compressor controller where the resonant heating circuit is connected in series with any one of the inverter half-bridges in the three-phase inverter circuit, and controls the motor and resonant heating circuit based on the desired heating power, the first circuit parameters, and the input desired heating power. The theoretical heating power is determined by the second circuit parameters, and the actual heating power is determined by the first and second circuit parameters. The actual carrier frequency is then determined based on the theoretical and actual heating power to control the motor and the resonant heating circuit. This avoids the need for separate controllers and control circuits (including a PTC heater, an on-board PTC heater controller, a motor controller, and an inverter circuit) for motor control and heating functions. By connecting the resonant heating circuit in series with any one of the inverter half-bridges in the three-phase inverter circuit, the theoretical and actual heating power are determined based on the desired heating power, the first and second circuit parameters, and the actual carrier frequency is then determined based on these parameters to control the motor and the resonant heating circuit. This reduces the use of the PTC heater (replacing it with a resonant heating circuit), the on-board PTC heater controller, and the PTC heater control circuit, thereby lowering the cost of implementing motor control and heating functions.

[0072] Furthermore, based on the first embodiment of the control method for motor and resonant heating of this application described above, a second embodiment of the control method for motor and resonant heating of this application is proposed. The first circuit parameters include the bus voltage of the three-phase inverter circuit, the turn-on time of the target switch in the three-phase inverter circuit, and the current carrier frequency. The target switch includes a switch connected in series with the resonant heating circuit. The second circuit parameters include the equivalent resistance in the resonant heating circuit. The step of determining the theoretical heating power based on the desired heating power, the first circuit parameters, and the second circuit parameters includes:

[0073] Step S21: Determine the first product value between the bus voltage, the current carrier frequency, and the turn-on time, and determine the first ratio of the square of the first product value to the equivalent resistance.

[0074] Step S22: When the desired heating power is greater than the first ratio, the first ratio is taken as the theoretical heating power;

[0075] Step S23: When the desired heating power is less than or equal to the first ratio, the desired heating power is taken as the theoretical heating power.

[0076] In this embodiment, when determining the theoretical heating power, the main focus is on judging the expected heating power to determine whether it is greater than the maximum heating power of the entire hardware. The turn-on time refers to the conduction time of the switching transistor in the bridge arm where the resonant heating circuit is located. The maximum heating power is determined by calculating the first product between the bus voltage, the current carrier frequency, and the turn-on time. The square of the first product is then used as the first ratio of the equivalent resistance to the maximum heating power. The calculation formula can be found in formula (4). The maximum heating power is output when the carrier frequency f equals the resonant frequency fr. Furthermore, when the expected heating power is greater than the first ratio, the first ratio is used as the theoretical heating power; when the expected heating power is less than or equal to the first ratio, the expected heating power is used as the theoretical heating power, thus ensuring the accuracy of subsequent control. Further details can be found in... Figure 5 , Figure 5 This is a schematic diagram of a scenario for the control method of motor and resonant heating in this application. The desired heating power Pr is limited to the maximum heating power determined by the bus voltage Vdc, the current carrier frequency f, the on-time Ta, and the resistance value R through the function of the limiter Li. This ensures the accuracy of subsequent feedback based on the heating power.

[0077] In one embodiment, the second circuit parameters include the resonant frequency and quality factor of the resonant heating circuit. The step of determining the actual heating power based on the first and second circuit parameters includes:

[0078] Step S24: Input the equivalent resistance, resonant frequency, and quality factor into the preset impedance amplitude formula to determine the impedance amplitude of the resonant heating circuit.

[0079] Step S25: Determine the first product value between the bus voltage, carrier frequency and turn-on time, and determine the second ratio of the square of the first product value to the impedance amplitude as the actual heating power.

[0080] In this embodiment, the actual heating power is determined simultaneously with the theoretical heating power. The actual heating power then has an actual resonant frequency *fr*. This, along with the equivalent resistance and quality factor, is used to determine the impedance amplitude of the resonant heating circuit within a preset impedance amplitude formula. The first product between the bus voltage, carrier frequency, and turn-on time is determined, and the square of this first product is used as the second ratio of the impedance amplitude to the actual heating power. This can be referred to in formula (4). Figure 5The function of the arithmetic unit Y is to calculate the actual heating power based on formula (4). It is worth noting that the advantage of collecting the equivalent resistance, resonant frequency, and quality factor each time is to avoid parameter changes during use, such as changes in resistance value. The method of collecting these parameters can be consistent with existing methods and is not limited here. Furthermore, referring to… Figure 6 , Figure 6 This is a flowchart illustrating the control method for the motor and resonant heating of this application. The entire process involves determining the resonant frequency fr, quality factor Q, total impedance |Z|, duty cycle α, and DC component Ta of the input square wave voltage of the resonant heating circuit. These parameters can be calculated or obtained in any order. Finally, based on these parameters, the output power of the resonant heating circuit within one carrier cycle is calculated. Feedback processing is then performed based on the output power and the theoretical heating power required by the user to ensure the accuracy of the motor and resonant heating control. Simultaneously, the output power of the resonant heating circuit within one electrical cycle can also be calculated to allow the user to understand the performance information of the resonant heating circuit.

[0081] Furthermore, based on the first and / or second embodiments of the control method for motor and resonant heating described above, a third embodiment of the control method for motor and resonant heating of this application is proposed, comprising the step of determining the actual carrier frequency based on the theoretical heating power and the actual heating power, including:

[0082] Step S31: Determine the power deviation between the theoretical heating power and the actual heating power, and obtain the actual carrier frequency by proportional integration based on the power deviation.

[0083] In this embodiment, after obtaining the theoretical heating power and the actual heating power, the power deviation value between the theoretical heating power and the actual heating power is determined, and the actual carrier frequency is obtained by proportional integration based on the power deviation value. Figure 5The functions of the adder K and the proportional-integral (PI) converter are explained. At this time, the motor controller (assuming it is the controller executed in this application) outputs SVPWM (Space Vector Pulse Width Modulation) to drive the motor, such as a permanent magnet synchronous motor, based on the motor field-oriented control theory. Simultaneously, it can directly acquire the turn-on time and determine the actual carrier frequency based on the acquired information. This allows for control of the bridge arm containing the resonant heating circuit based on the actual carrier frequency, achieving both motor control and resonant heating at low cost while ensuring the accuracy of the resonant heating control. It is worth noting that the entire three-phase inverter circuit may include V-phase sampling resistors and W-phase sampling resistors for a dual-resistor current sampling scheme, acquiring phase currents iv and iw. The phase current iu is calculated according to Kirchhoff's laws and used as the feedback current for motor field-oriented control. Alternatively, a circuit for acquiring bus voltage can be included, using a conventional voltage acquisition circuit. A circuit for acquiring resistance values ​​may also be present, but these will not be described in detail here.

[0084] In one embodiment, after determining the actual carrier frequency based on the theoretical heating power and the actual heating power, the method includes:

[0085] Step S32: Use the actual carrier frequency as the current carrier frequency, and update the control parameter information of the compressor controller for the next moment based on the current carrier frequency.

[0086] In this embodiment, after the carrier frequency feedback control is completed, the actual carrier frequency is used as the current carrier frequency, and the control parameter information of the compressor controller at the next moment is updated based on the current carrier frequency, so as to perform the next carrier control. It is worth noting that the entire control cycle can be controlled in real time, or the actual induction heating power P0 within a carrier cycle can be used as the feedback quantity for power closed-loop control to complete the control parameter information and the closed loop of the entire motor and resonant heating control.

[0087] In one embodiment, after determining the actual carrier frequency based on the theoretical heating power and the actual heating power, the method includes:

[0088] Step S33: Control the resonant heating circuit based on the actual carrier frequency;

[0089] Step S34: Determine the waveform duty cycle corresponding to the actual carrier frequency, and control the motor based on the waveform duty cycle.

[0090] In this embodiment, the output actual carrier frequency can be used to directly control the power of the resonant heating circuit based on formula (4). At the same time, referring to the carrier angular frequency w = 2πf = 2π / T, the change of carrier frequency will affect the carrier period, and thus affect the setting of duty cycle. Therefore, the waveform duty cycle corresponding to the actual carrier frequency can be determined, and the motor can be controlled based on the waveform duty cycle. The waveform duty cycle refers to the value of the duty cycle of the motor that needs to be controlled under different carrier frequencies. It can change with the influence of carrier frequency, or it can remain unchanged. It is not limited here.

[0091] Furthermore, refer to Figure 7 , Figure 7 This is a schematic diagram of the controller structure of the hardware operating environment involved in the embodiments of the present invention.

[0092] like Figure 7 As shown, the controller may include: a processor 0003, such as a central processing unit (CPU), a communication bus 0001, an acquisition interface 0002, a processing interface 0004, and a memory 0005. The communication bus 0001 is used to enable communication between these components. The acquisition interface 0002 may include an information acquisition device or acquisition unit, such as a computer; optionally, the acquisition interface 0002 may also include a standard wired interface or a wireless interface. The processing interface 0004 may optionally include a standard wired interface or a wireless interface. The memory 0005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk storage device. Optionally, the memory 0005 may also be a storage device independent of the aforementioned processor 0003.

[0093] Those skilled in the art will understand that Figure 7 The structure shown does not constitute a limitation on the controller and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0094] like Figure 7 As shown, the memory 0005, which serves as a computer storage medium, may include an operating system, an acquisition interface module, a processing interface module, and a current detection program for power devices executed by a controller.

[0095] exist Figure 7In the controller shown, the communication bus 0001 is mainly used to realize the connection and communication between components; the acquisition interface 0002 is mainly used to connect to the backend server and communicate with the backend server; the processing interface 0004 is mainly used to connect to the deployment end (user end) and communicate with the deployment end; the processor 0003 and the memory 0005 in the controller of the present invention can be set in the controller. The controller calls the current detection program of the power device stored in the memory 0005 through the processor 0003 and executes the current detection circuit of the power device provided in the embodiment of the present invention.

[0096] The present invention also provides a controller, which (can be an integrated controller for motor control) is installed within the compressor controller and connected to the three-phase inverter circuit and the resonant heating circuit, as described above. Figure 8 , Figure 8 This is a schematic diagram of the controller module of the present invention. The controller includes:

[0097] The information acquisition module A01 is used to acquire the control parameter information of the compressor controller at the current moment, wherein the control parameter information includes the first circuit parameters of the three-phase inverter circuit, the second circuit parameters of the resonant heating circuit, and the input desired heating power;

[0098] The power determination module A02 is used to determine the theoretical heating power based on the desired heating power, the first circuit parameters, and the second circuit parameters, and to determine the actual heating power based on the first circuit parameters and the second circuit parameters.

[0099] The carrier control module A03 is used to determine the actual carrier frequency based on the theoretical heating power and the actual heating power, so as to control the motor and the resonant heating circuit based on the actual carrier frequency.

[0100] The methods executed by the above-mentioned program modules can be referred to in the various embodiments of the control method for motor and resonant heating of the present invention, and will not be repeated here.

[0101] The present invention also provides a computer-readable storage medium.

[0102] The present invention provides a computer-readable storage medium storing a control program for a motor and resonant heating executed by a controller, wherein when the control program for the motor and resonant heating is executed by a processor, the steps of the control method for the motor and resonant heating described above are implemented.

[0103] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the data management method described above.

[0104] The computer program product provided in this application can solve the technical problem of high implementation cost of motor control and heating functions. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as the beneficial effects of the motor and resonant heating control method provided in the above embodiments, and will not be repeated here.

[0105] Based on the first, second, and / or third embodiments of the control method for motor and resonant heating of this application, this application also proposes a first embodiment of an on-board compressor. The on-board compressor includes a compressor controller, a motor M, and a compression unit. The compressor controller is connected to the motor M, and the motor is connected to the compression unit. The compressor controller is provided with a three-phase inverter circuit 20 and a resonant heating circuit 10. The resonant heating circuit 10 is connected in series with any one of the inverter half-bridges in the three-phase inverter circuit 20. The output terminal of the three-phase inverter circuit 20 is connected to the motor M. The compressor controller executes the above-described control method for motor and resonant heating.

[0106] It is worth noting that, according to the vehicle-mounted compressor of this application embodiment, the controller in the vehicle-mounted compressor executes a control program for the motor and resonant heating: obtaining the control parameter information of the compressor controller at the current moment, wherein the control parameter information includes the first circuit parameters of the three-phase inverter circuit, the second circuit parameters of the resonant heating circuit, and the input desired heating power; determining the theoretical heating power based on the desired heating power, the first circuit parameters, and the second circuit parameters, and determining the actual heating power based on the first circuit parameters and the second circuit parameters; determining the actual carrier frequency based on the theoretical heating power and the actual heating power, so as to control the motor and the resonant heating circuit based on the actual carrier frequency, and then connecting the resonant heating circuit in series with any one of the inverter half-bridges in the three-phase inverter circuit, and then determining the theoretical heating power and the actual heating power based on the desired heating power, the first circuit parameters, and the second circuit parameters, and then controlling the motor and the resonant heating circuit based on the actual carrier frequency after determining the theoretical heating power and the actual heating power, can reduce the use of the PTC heater (replacing it with the resonant heating circuit for heating), the vehicle-mounted PTC heater controller, and the control circuit of the PTC heater, thereby reducing the implementation cost of the motor control and heating functions.

[0107] The vehicle-mounted compressor controls the movement of the motor M. Simultaneously, a resonant heating circuit 10 is connected to the three-phase inverter circuit 20 of the motor M. Through the control program for the motor and resonant heating in this embodiment, simultaneous control of the motor and resonant heating circuit can be achieved (i.e., on the basis of the original single motor control circuit, the resonant heating circuit 10 is directly connected, so that the resonant heating effect can be additionally achieved based on the control program for the motor and resonant heating), or control of either the motor or the resonant heating circuit separately. This reduces the need for a PTC heater (replaced with a resonant heating circuit), a vehicle-mounted PTC heater controller, and a PTC heater control circuit, thereby lowering the implementation cost of motor control and heating functions.

[0108] Furthermore, based on the first embodiment of the vehicle-mounted compressor of this application described above, referring to... Figure 9 , Figure 9 This is a schematic diagram showing the connection between the three-phase inverter circuit and the resonant heating circuit within the compressor controller of this application. A second embodiment of the vehicle-mounted compressor of this application is presented, wherein the resonant heating circuit 10 includes:

[0109] The equivalent resistance R1 is connected to the first end of any one of the inverter half-bridges in the three-phase inverter circuit 20.

[0110] Resonant capacitor C1, with its first terminal connected to the second terminal of the equivalent resistance R1;

[0111] The resonant inductor L1 has its first end connected to the second end of the resonant capacitor C1, and its second end is connected to the second end of any one of the inverter half-bridges in the three-phase inverter circuit 20.

[0112] In this embodiment, the resonant heating circuit 10 includes an equivalent resistance R1, a resonant capacitor C1, and a resonant inductor L1. Its principle is the same as that of a commonly used RLC resonant circuit, primarily relying on RLC for heating. The specific selection and parameter choices for the equivalent resistance R1, resonant capacitor C1, and resonant inductor L1 can be made according to actual conditions. Furthermore, to accurately control the operation and standby of the resonant heating circuit 10, a switching transistor S7 can be connected. The motor controller 30 can then send a control signal to the third terminal (the control terminal of the switching transistor S7) to control the switching transistor S7 to turn on and off, thereby enabling the resonant heating circuit 10 to operate and standby. It is worth noting that the above is only one possible connection relationship for the equivalent resistance R1, resonant capacitor C1, resonant inductor L1, and switching transistor S7. Other connection relationships are also possible, such as placing the switching transistor S7 at the first terminal of the equivalent resistance R1. Adaptive connections can also be made according to actual conditions and user selection, and are not limited here.

[0113] Furthermore, based on the first and / or second embodiments of the vehicle-mounted compressor of this application described above, a third embodiment of the vehicle-mounted compressor of this application is proposed. The three-phase inverter circuit 20 includes a first inverter bridge arm 21, a second inverter bridge arm 22, and a third inverter bridge arm 23. The inverter half-bridge of the first inverter bridge arm 21, the inverter half-bridge of the second inverter bridge arm 22, or the inverter half-bridge of the third inverter bridge arm 23 is connected to the resonant heating circuit 10.

[0114] Furthermore, the motor M includes a first-phase input terminal W, a second-phase input terminal V, and a third-phase input terminal U, and the three-phase inverter circuit 20 also includes:

[0115] Motor controller;

[0116] The first end of the first inverter bridge arm 21 is connected to the positive terminal of the external power supply Vdc, the second end of the first inverter bridge arm 21 is connected to the negative terminal of the external power supply Vdc, and the midpoint of the first inverter bridge arm 21 is connected to the first phase input terminal W.

[0117] The first end of the second inverter bridge arm 22 is connected to the positive terminal of the external power supply Vdc, the second end of the second inverter bridge arm 22 is connected to the negative terminal of the external power supply Vdc, and the midpoint of the bridge arm of the second inverter bridge arm 22 is connected to the second phase input terminal V.

[0118] The third end of the third inverter bridge arm 23 is connected to the positive terminal of the external power supply Vdc, the second end of the third inverter bridge arm 23 is connected to the negative terminal of the external power supply Vdc, and the midpoint of the bridge arm of the third inverter bridge arm 23 is connected to the third phase input terminal U. The first inverter bridge arm 21, the second inverter bridge arm 22 and the third inverter bridge arm 23 are composed of two series-connected switching transistors, and the control terminal of the switching transistors is connected to the motor controller. The external power supply Vdc is used to provide the bus voltage.

[0119] In this embodiment, the three-phase inverter circuit 20 includes three inverter bridge arms, namely the first inverter bridge arm 21, the second inverter bridge arm 22, and the third inverter bridge arm 23. Each bridge arm is composed of two switching transistors connected in series. The connection point of the two switching transistors serves as the midpoint of the bridge arm and is connected to the first phase input terminal W, the second phase input terminal V, and the third phase input terminal U of the motor M. The two ends of the connection between the two switching transistors are respectively connected to the negative terminal HV- and the positive terminal HV+ of the external power supply 100, thereby forming the three-phase inverter circuit 20. It is worth noting that the first switching transistor S1 to the sixth switching transistor S6 and the turn-on switching transistors S7 to S9 can all be IGBTs (Insulated Gate Bipolar Transistors), MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), or other types. There are no restrictions on the type of switching transistors used. Based on the above three-phase inverter circuit 20, the motor M can be controlled normally. Simultaneously, the resonant heating circuit 10 shares the internal half-bridge, thus enabling resonant heating. It is also worth noting that the equivalent sampling resistor RX can be used with the sampling operational amplifier to acquire the current of the external power supply Vdc; the second sampling resistor RV can be used with the sampling operational amplifier to acquire the phase voltage of the second phase input terminal V; and the third sampling resistor RU can be used with the sampling operational amplifier to acquire the phase voltage of the third phase input terminal U. The use of the sampling operational amplifier is the same as in commonly used sampling circuits and is not limited here. It is worth noting that, on the one hand, since the voltage of the external power supply Vdc is required in the entire control process, a related voltage acquisition circuit or device can be used to acquire it. The circuit for acquiring the voltage of the external power supply Vdc is not limited here. On the other hand, the resonant heating circuit 10 can be set in the inverter half-bridge of the first inverter bridge arm 21, the inverter half-bridge of the second inverter bridge arm 22, or the inverter half-bridge of the third inverter bridge arm 23. The inverter half-bridge can be the upper bridge or the lower bridge, and the number of resonant heating circuits 10 can be selected according to the actual situation.

[0120] The device provided in this application can solve the technical problem of high implementation cost of motor control and heating functions. Compared with the prior art, the beneficial effects of the device provided in this application are the same as those of the motor and resonant heating control method provided in the above embodiments, and will not be repeated here.

[0121] This application also provides a vehicle that includes the aforementioned on-board compressor.

[0122] It is worth noting that the vehicle-mounted compressor can be installed in the vehicle to address the technical challenge of high costs associated with implementing motor control and heating functions. It is also worth noting that other hardware can be installed in the vehicle, which will not be detailed here. The entire vehicle-mounted compressor can be installed in the vehicle or in other products; this is not a limitation.

[0123] The device provided in this application can solve the technical problem of high implementation cost of motor control and heating functions. Compared with the prior art, the beneficial effects of the vehicle provided in this application are the same as the beneficial effects of the motor and resonant heating control method provided in the above embodiments, and will not be repeated here.

[0124] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A control method for a motor and resonant heating, characterized in that, The control method for the motor and resonant heating is applied to a compressor controller connected to the motor. The compressor controller includes a three-phase inverter circuit and a resonant heating circuit. The resonant heating circuit is connected in series with any one of the inverter half-bridges in the three-phase inverter circuit. The control method for the motor and resonant heating includes: Obtain the control parameter information of the compressor controller at the current moment, wherein the control parameter information includes the first circuit parameters of the three-phase inverter circuit, the second circuit parameters of the resonant heating circuit, and the input desired heating power; The theoretical heating power is determined based on the desired heating power, the first circuit parameters, and the second circuit parameters, and the actual heating power is determined based on the first circuit parameters and the second circuit parameters. The actual carrier frequency is determined based on the theoretical heating power and the actual heating power, and the motor and the resonant heating circuit are controlled based on the actual carrier frequency.

2. The control method for motor and resonant heating as described in claim 1, characterized in that, The first circuit parameters include the bus voltage of the three-phase inverter circuit, the turn-on time of the target switch in the three-phase inverter circuit, and the current carrier frequency. The target switch includes a switch connected in series with the resonant heating circuit. The second circuit parameters include the equivalent resistance in the resonant heating circuit. The step of determining the theoretical heating power based on the desired heating power, the first circuit parameters, and the second circuit parameters includes: Determine a first product value between the bus voltage, the current carrier frequency, and the turn-on time, and determine a first ratio of the square of the first product value to the equivalent resistance; When the desired heating power is greater than the first ratio, the first ratio is taken as the theoretical heating power; When the desired heating power is less than or equal to the first ratio, the desired heating power is taken as the theoretical heating power.

3. The control method for motor and resonant heating as described in claim 2, characterized in that, The second circuit parameters include the resonant frequency and quality factor of the resonant heating circuit. The step of determining the actual heating power based on the first circuit parameters and the second circuit parameters includes: The equivalent resistance, the resonant frequency, and the quality factor are input into a preset impedance amplitude formula to determine the impedance amplitude of the resonant heating circuit. A first product value is determined between the bus voltage, the carrier frequency, and the turn-on time, and a second ratio of the square of the first product value to the impedance amplitude is determined as the actual heating power.

4. The control method for motor and resonant heating as described in claim 1, characterized in that, The step of determining the actual carrier frequency based on the theoretical heating power and the actual heating power includes: The power deviation between the theoretical heating power and the actual heating power is determined, and the actual carrier frequency is obtained by proportional integration based on the power deviation.

5. The control method for motor and resonant heating as described in any one of claims 1 to 4, characterized in that, After the step of determining the actual carrier frequency based on the theoretical heating power and the actual heating power, the method includes: The actual carrier frequency is used as the current carrier frequency, and the control parameter information of the compressor controller at the next moment is updated based on the current carrier frequency.

6. The control method for motor and resonant heating as described in any one of claims 1 to 4, characterized in that, After the step of determining the actual carrier frequency based on the theoretical heating power and the actual heating power, the method further includes: The resonant heating circuit is controlled based on the actual carrier frequency. Determine the waveform duty cycle corresponding to the actual carrier frequency, and control the motor based on the waveform duty cycle.

7. A vehicle-mounted compressor, characterized in that, The vehicle-mounted compressor includes a compressor controller, a motor, and a compression unit. The compressor controller is connected to the motor, and the motor is connected to the compression unit. The compressor controller is provided with a three-phase inverter circuit and a resonant heating circuit. The resonant heating circuit is connected in series with any one of the inverter half-bridges in the three-phase inverter circuit. The output terminal of the three-phase inverter circuit is connected to the motor. The compressor controller executes the motor and resonant heating control method as described in any one of claims 1 to 6.

8. The vehicle-mounted compressor as described in claim 7, characterized in that, The resonant heating circuit includes: Equivalent resistance, the first end of which is connected to the first end of any one of the inverter half-bridges in the three-phase inverter circuit; A resonant capacitor, wherein the first terminal of the resonant capacitor is connected to the second terminal of the equivalent resistor; A resonant inductor, the first end of which is connected to the second end of the resonant capacitor, and the second end of which is connected to the second end of any one of the inverter half-bridges in the three-phase inverter circuit.

9. The vehicle-mounted compressor as described in claim 7, characterized in that, The three-phase inverter circuit includes a first inverter bridge arm, a second inverter bridge arm, and a third inverter bridge arm, wherein the inverter half-bridge of the first inverter bridge arm, the inverter half-bridge of the second inverter bridge arm, or the inverter half-bridge of the third inverter bridge arm is connected to the resonant heating circuit.

10. The vehicle-mounted compressor as described in claim 9, characterized in that, The motor includes a first-phase input terminal, a second-phase input terminal, and a third-phase input terminal. The three-phase inverter circuit includes: Motor controller; The first end of the first inverter bridge arm is connected to the positive terminal of the external power supply, the second end of the first inverter bridge arm is connected to the negative terminal of the external power supply, and the midpoint of the first inverter bridge arm is connected to the first phase input terminal. The first end of the second inverter bridge arm is connected to the positive terminal of the external power supply, the second end of the second inverter bridge arm is connected to the negative terminal of the external power supply, and the midpoint of the second inverter bridge arm is connected to the second phase input terminal. The third end of the third inverter bridge arm is connected to the positive terminal of the external power supply, the second end of the third inverter bridge arm is connected to the negative terminal of the external power supply, and the midpoint of the third inverter bridge arm is connected to the third phase input terminal. The first inverter bridge arm, the second inverter bridge arm, and the third inverter bridge arm are composed of two series-connected switching transistors, and the control terminal of the switching transistors is connected to the motor controller. The external power supply is used to provide bus voltage.

11. A vehicle, characterized in that, The vehicle includes the on-board compressor as described in any one of claims 7 to 10.

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