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 fields of motor control and resonant heating technology. It is applied to a compressor controller connected to a motor and 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 from the compressor controller, including the bus voltage of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and a preset desired power value. A carrier frequency value is determined based on the desired power value, bus voltage, and circuit control parameters. The motor and resonant heating circuit are then controlled according to the carrier frequency value. This application improves the safety of the heating function.

Description

Technical Field

[0001] This application relates to the field of motor control and resonant heating technology, and in particular to a control method for a motor and resonant heating, an on-board compressor, and a vehicle. Background Technology

[0002] As heating technology becomes more widely used in various fields, users are also placing higher demands on how heating functions are implemented.

[0003] Traditional motor control and heating functions are implemented using a PTC (Positive Temperature Coefficient) heater. The heating is regulated by changing the number of switches or adjusting the duty cycle of the switches based on the onboard PTC heater controller. This requires separate inverter circuits and motor controllers for motor control. This approach has significant drawbacks, as it necessitates separate controllers and control circuits (including the PTC heater, onboard PTC heater controller, motor controller, and inverter circuit) for each function. Therefore, there is an urgent need for a cost-effective method to implement motor control and heating functions.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this application is to provide a control method for an electric motor and resonant heating, an on-board compressor, and a vehicle, aiming to solve the technical problem of achieving motor control and heating functions at low cost.

[0006] To achieve the above objectives, this application provides a control method for a motor and resonant heating. This control method is 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 control method for the motor and resonant heating includes:

[0007] Obtain the control parameter information of the compressor controller, wherein the control parameter information includes the bus voltage of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and the preset expected power value;

[0008] The carrier frequency value is determined based on the desired power value, the bus voltage, and the circuit control parameters.

[0009] The motor and the resonant heating circuit are controlled according to the carrier frequency value.

[0010] In one embodiment, the circuit control parameters include the resistance value of the equivalent resistor in the resonant heating circuit, the capacitance value of the resonant capacitor, and the inductance value of the resonant inductor. The step of determining the carrier frequency value based on the desired power value, the bus voltage, and the circuit control parameters includes:

[0011] The resonant angular frequency is determined based on the capacitance and inductance values, and the quality factor is determined based on the resonant angular frequency, capacitance, and inductance values.

[0012] Based on the quality factor, the resistance value, the desired power value, and the bus voltage, the carrier frequency value is determined in the preset electromagnetic heating rules.

[0013] In one embodiment, the resonant heating circuit includes a switching transistor for connecting or disconnecting from the three-phase inverter circuit. Prior to the step of obtaining the control parameter information of the compressor controller, the following steps are included:

[0014] Upon receiving a heating command, the system controls the on-switch transistor to connect to the three-phase inverter circuit and executes the step of obtaining the control parameter information of the compressor controller.

[0015] When no heating command is received, the control switch transistor is used to disconnect the three-phase inverter circuit.

[0016] In one embodiment, the three-phase inverter circuit includes a first switch and a second switch on the inverter half-bridge connected to the resonant heating circuit. After the step of controlling the on switch to connect to the three-phase inverter circuit upon receiving a heating command, the following steps are included:

[0017] When the heating command is received but the motor operation command is not received, the first and second switching transistors are controlled to operate with a preset duty cycle, and under the control operation, the step of obtaining the control parameter information of the compressor controller is executed.

[0018] In one embodiment, the step of controlling the motor and the resonant heating circuit according to the carrier frequency value includes:

[0019] The resonant heating circuit is controlled based on the carrier frequency value;

[0020] Determine the waveform duty cycle corresponding to the carrier frequency value, and control the motor based on the waveform duty cycle.

[0021] In addition, to achieve the above objectives, a vehicle-mounted compressor is also provided, the vehicle-mounted compressor including a compressor controller, a motor and a compression unit, the compressor controller being connected to the motor and the motor being connected to the compression unit;

[0022] The compressor controller includes a three-phase inverter circuit, a resonant heating circuit, and a controller. The resonant heating circuit is connected in series with any one of the inverter half-bridges in the three-phase inverter circuit. The controller is connected to both the three-phase inverter circuit and the resonant heating 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.

[0023] In one embodiment, the resonant heating circuit includes:

[0024] The resonant heating circuit includes:

[0025] 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;

[0026] A resonant capacitor, wherein the first terminal of the resonant capacitor is connected to the second terminal of the equivalent resistor;

[0027] A resonant inductor, wherein the first end of the resonant inductor is connected to the second end of the resonant capacitor;

[0028] A switching transistor is provided, the first end of which is connected to the second end of the resonant inductor, 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 further 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.

[0035] In one embodiment, the compressor controller is further provided with a sampling circuit, which includes a first sampling circuit connected to the first inverter bridge arm, a second sampling circuit connected to the second inverter bridge arm, and a third sampling circuit connected to the third inverter bridge arm. The first sampling circuit, the second sampling circuit, and the third sampling circuit are composed of sampling resistors and sampling operational amplifiers.

[0036] In addition, to achieve the above objectives, a vehicle is also provided, the vehicle including the aforementioned on-board compressor.

[0037] 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 involves acquiring control parameter information from the compressor controller, including the bus voltage of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and a preset desired power value. A carrier frequency value is determined based on the desired power value, bus voltage, and circuit control parameters. The motor and resonant heating circuit are then controlled according to the carrier frequency value. This control method for a motor and resonant heating is applied to 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 the carrier frequency value is determined using the desired power value, bus voltage, and circuit control parameters. By controlling the motor and resonant heating circuit based on the carrier frequency value, the need for separate controllers and control circuits (including PTC heater, vehicle PTC heater controller, motor controller, and inverter circuit) for motor control and heating functions is avoided. On the one hand, heating through the resonant heating circuit can avoid the short-circuit safety problem caused by PTC heating. On the other hand, by connecting the resonant heating circuit in series with any one of the inverter half-bridges in the three-phase inverter circuit, the carrier frequency value is determined based on the desired power value, bus voltage, and circuit control parameters. Then, the motor and resonant heating circuit are controlled based on the carrier frequency value, which reduces the use of PTC heater (replacing it with resonant heating circuit), vehicle PTC heater controller, and PTC heater control circuit, thus achieving motor control and heating functions at a low cost. Attached Figure Description

[0038] Figure 1This is a flowchart illustrating the first embodiment of the control method for motor and resonant heating according to this application;

[0039] Figure 2 This is a waveform diagram showing the output power and frequency in the three-phase inverter circuit of this application;

[0040] Figure 3 This is a waveform diagram of a carrier wave and power in the resonant heating circuit of this application;

[0041] Figure 4 This is a schematic diagram of the connection between the motor and the resonant heating control method in this application;

[0042] Figure 5 This is a schematic diagram of an implementation process of the control method for motor and resonant heating in this application;

[0043] Figure 6 This is another schematic diagram of the control method for motor and resonant heating in this application;

[0044] Figure 7 This is a schematic diagram of the controller structure of the hardware operating environment involved in the embodiments of the present invention;

[0045] Figure 8 This is a schematic diagram of the controller module of the present invention.

[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] V DC 1. 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. 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 heaters are widely used in automobiles, primarily for preheating the engine in winter and heating the passenger compartment. To adjust their heating power, an onboard PTC heater controller is typically used. This controller adjusts the PTC heater's settings by changing the number of switches or adjusting the duty cycle. However, PTC heaters are prone to dry burning and thermal runaway due to their inherent heating properties. Therefore, high-frequency resonant heating has emerged as a solution. High-frequency resonant heating offers advantages such as a simple control environment (a half-bridge topology is sufficient), fewer power devices, low cost, and excellent robustness. The maximum power output point of this topology is located precisely at the resonant frequency, while also achieving the highest efficiency. The control drawback of the above resonant heating circuit is that the control topology and the inverter circuit that controls the motor itself need to be set up separately. Taking the three-phase inverter circuit as an example, the control topology contains 2 switching transistors, while the three-phase inverter circuit contains 6 switching transistors. On the one hand, this will increase the complexity and cost of the devices that need to realize motor control and heating. On the other hand, the two control circuits need to be arranged separately, which will increase the overall device layout area. Due to the increase in the number of switching transistors, more area is needed to arrange the circuit, which in turn makes the device larger.

[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: This method is applied within a compressor controller connected in series with any one of the inverter half-bridges in the three-phase inverter circuit. The carrier frequency value is determined by the desired power value, bus voltage, and circuit control parameters. Control of the motor and resonant heating circuit is then based on this carrier frequency value. 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 both motor control and heating functions. On one hand, heating via the resonant heating circuit avoids short-circuit safety issues caused by PTC heating. On the other hand, 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 carrier frequency value based on the desired power value, bus voltage, and circuit control parameters, and finally controlling the motor and resonant heating circuit based on the carrier frequency value, the use of the PTC heater (replaced by the resonant heating circuit), the on-board PTC heater controller, and the PTC heater control circuit can be reduced, thus achieving motor control and heating functions at a low cost.

[0053] In one embodiment of this application, reference is made to Figure 1 , Figure 1This 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, wherein the control parameter information includes the bus voltage of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and the preset expected power value;

[0055] For example, in the resonant heating circuit 10 (a circuit consisting of a resonant inductor L1, a resonant capacitor C1, and an equivalent resistance R1 connected in series), the resonant element performs high-frequency electromagnetic induction heating, thereby controlling the frequency of the entire circuit to achieve controllable heating. The total impedance formula of the resonant heating circuit 10 is 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. According to relevant power formulas (such as resistive heating power) and the total impedance formula, it can be seen that the frequency of the induction heating output determines the equivalent impedance. The magnitude of the equivalent impedance can be changed by adjusting the frequency, thereby controlling the heating power. Further details can be found by referring to… Figure 2 , Figure 2 This is a waveform diagram illustrating the output power and frequency in the three-phase inverter circuit of this application. In the diagram, P represents the actual output power of the circuit, P0 represents the output power at circuit resonance, f represents the actual operating frequency, and f0 represents the resonant frequency of the circuit itself. Actual control is achieved by setting f>=f0 for electromagnetic induction heating power control; generally, the resonant point is set >=10kHz. Further details can be found in... Figure 3 , Figure 3 This is a waveform diagram of a carrier wave and power in the resonant heating circuit of this application. In practical applications, the QL value of the inductor determines the attenuation of different carrier waves. Therefore, an inductor with a high QL value needs to be designed for power-regulated half-bridge electromagnetic heating. The power formula for the resonant heating circuit 10 is as follows:

[0056]

[0057] Wherein: the resonant angular frequency of the resonant circuit wr=1 / √LC, the resonant frequency fr=1 / 2π√LC, the quality factor QL=wrL / R=1 / wrRC, where Irms is the effective value current of the resonant inductor, Req is the equivalent resistance of the resonant heating circuit 10, Udc is the DC voltage (bus voltage), QL is the quality factor, and ωs is the carrier frequency. Therefore, the carrier frequency of the resonant heating circuit 10 can be controlled based on the power formula (1) to achieve the heating control of the resonant heating circuit 10.

[0058] In this embodiment, when controlling the motor and resonant heating, the control parameter information of the compressor controller is obtained, and then the control of the motor and resonant heating circuit 10 is realized based on the control parameter information. The control parameter information includes the bus voltage of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and the preset desired power value. Specifically, the bus voltage refers to the voltage provided to the three-phase inverter circuit 20, denoted as Udc; the circuit control parameters refer to the parameters of each component in the resonant heating circuit, such as the numerical parameters of resistance, capacitance, and inductance; and the desired power value refers to the power value defined by the user. Based on these parameters, the carrier frequency of the PWM controlling the resonant heating circuit 10 can be determined, and the resonant heating circuit 10 can be controlled based on this carrier frequency to achieve heating. Simultaneously, the motor is controlled based on the PWM duty cycle to achieve motor control and heating of the resonant heating circuit 10. This reduces the cost of motor control and resonant heating circuit 10 heating, and also avoids the dry burning and thermal runaway problems caused by PTC (which lacks related protection control and signal control).

[0059] Step S20: Determine the carrier frequency value based on the desired power value, bus voltage, and circuit control parameters;

[0060] Step S30: Control the motor and resonant heating circuit according to the carrier frequency value.

[0061] In this embodiment, after obtaining the desired power value, bus voltage, and circuit control parameters, the carrier frequency value is determined based on the desired power value, bus voltage, and circuit control parameters. That is, ωs is determined by referring to formula (1), and then the resonant heating circuit 10 is controlled to heat based on ωs. At the same time, since w = 2πws = 2π / T, that is, ωs is related to the carrier period of PWM, it will indirectly affect the duty cycle. Then, the motor is controlled based on the affected duty cycle to achieve simultaneous control of the motor and heating. On the one hand, the electromagnetic heating method avoids the short circuit and dry burning phenomena that may occur during PTC heating, improving the safety and reliability of the system. On the other hand, the existing motor control inverter circuit is used to realize the motor control and electromagnetic heating functions, thereby reducing the cost of motor control and electromagnetic heating. It is worth noting that the power formula can refer to the amplitude of the total impedance:

[0062]

[0063] Where w is the resonant angular frequency, w = 2πf = 2π / T. Combining the two formulas, a new power formula is determined, and then the relationship between the carrier frequency and the desired power value is determined based on the new power formula.

[0064] 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 involves acquiring control parameter information from the compressor controller, including the bus voltage of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and a preset desired power value. A carrier frequency value is determined based on the desired power value, bus voltage, and circuit control parameters. The motor and resonant heating circuit are then controlled according to the carrier frequency value. This control method for a motor and resonant heating is applied to 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 the carrier frequency value is determined using the desired power value, bus voltage, and circuit control parameters. This invention controls the motor and resonant heating circuit based on the carrier frequency value, thus avoiding the need for separate controllers and control circuits (including PTC heater, vehicle PTC heater controller, motor controller, and inverter circuit) for motor control and heating functions. On the one hand, heating through the resonant heating circuit avoids the short-circuit safety issues caused by PTC heating. On the other hand, by connecting the resonant heating circuit in series with any one of the inverter half-bridges in the three-phase inverter circuit, the carrier frequency value is determined based on the desired power value, bus voltage, and circuit control parameters. Then, the motor and resonant heating circuit are controlled based on the carrier frequency value, which reduces the use of the PTC heater (replacing it with the resonant heating circuit), vehicle PTC heater controller, and PTC heater control circuit, thereby achieving motor control and heating functions at a low cost.

[0065] Furthermore, based on the first embodiment of the control method for motor and resonant heating described above, a second embodiment of the control method for motor and resonant heating of this application is proposed. The circuit control parameters include the resistance value of the equivalent resistor in the resonant heating circuit, the capacitance value of the resonant capacitor, and the inductance value of the resonant inductor. The step of determining the carrier frequency value based on the desired power value, the bus voltage, and the circuit control parameters includes:

[0066] Step S21: Determine the resonant angular frequency based on the capacitance and inductance values, and determine the quality factor based on the resonant angular frequency, capacitance, and inductance values.

[0067] Step S22: Based on the quality factor, resistance value, desired power value and bus voltage, determine the carrier frequency value in the preset electromagnetic heating rules.

[0068] In this embodiment, when determining the carrier frequency value, the resonant angular frequency corresponding to the capacitance and inductance values ​​can be determined based on the circuit resonant angular frequency wr=1 / √LC. Then, the quality factor is determined based on the resonant angular frequency, capacitance and inductance values, i.e., based on QL=wrL / R=1 / wrRC. At this time, the resonant angular frequency wr and carrier frequency value QL in the power formula (1), as well as the suppression resistor value Req, the desired power value P0 and the bus voltage Udc, are determined. The carrier frequency value ωs is then determined based on the preset electromagnetic heating rule (i.e., the power formula (1)). It is worth noting that since the expected power value P0 is the product of the square of the effective value current Irms of the resonant inductor and the resistance value Req, and the amplitude of the total impedance is as shown in formula (2), the expected power value P0 can also be determined by the relationship between the amplitude of the total impedance and the resistance value Req. Then, the carrier frequency value ωs can be determined in formula (2) of the amplitude of the total impedance. The carrier frequency value ωs can be determined based on different methods. The two carrier frequency values ​​ωs can also be determined based on the above two methods. Then, the average value of the two carrier frequency values ​​ωs can be determined as the carrier frequency value ωs. Then, the resonant heating circuit 10 can be heated based on the carrier frequency value ωs. The original separate heating control circuit can be integrated into the existing motor control circuit. Then, the functions of motor control and resonant heating circuit 10 heating can be realized based on one circuit to reduce the implementation cost of the two functions.

[0069] In one embodiment, the step of controlling the motor and the resonant heating circuit according to the carrier frequency value includes:

[0070] Step S31: Control the resonant heating circuit based on the carrier frequency value;

[0071] Step S32: Determine the waveform duty cycle corresponding to the carrier frequency value, and control the motor based on the waveform duty cycle.

[0072] In this embodiment, when the carrier frequency value is determined, the resonant heating circuit is controlled to operate at the desired power value based on the carrier frequency value, thereby realizing the heating control of the resonant heating circuit. At the same time, the waveform duty cycle corresponding to the carrier frequency value is also determined, and the motor is controlled to operate based on the waveform duty cycle. For example, if the period T of the PWM under the carrier frequency value A is B, and the desired control of the motor duty cycle is 50%, then the high and low level distribution of 0.5B is determined based on the changed period T, thereby simultaneously completing the control of heating and motor. At this time, only one resonant heating circuit connected to the three-phase inverter circuit can be used, thereby reducing the cost of implementing heating and motor control.

[0073] 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. The resonant heating circuit includes a switching transistor for connecting or disconnecting with the three-phase inverter circuit. Before the step of obtaining the control parameter information of the compressor controller, the method includes:

[0074] Step S11: Upon receiving a heating command, control the conducting switch to connect to the three-phase inverter circuit and execute the step of obtaining control parameter information of the compressor controller;

[0075] Step S12: When no heating command is received, control the on-switch transistor to disconnect the three-phase inverter circuit.

[0076] In this embodiment, the resonant heating circuit includes a switching transistor, which is used to connect or disconnect from the three-phase inverter circuit. That is, the switching transistor can be controlled to connect or disconnect the resonant heating circuit from the three-phase inverter circuit, thereby enabling the resonant heating circuit to operate for heating or remain in standby mode without heating. When a heating command is received, the switching transistor is controlled to connect to the three-phase inverter circuit, and the step of obtaining control parameter information from the compressor controller is executed. In other words, when heating is detected, the switching transistor is turned on, thereby connecting the resonant heating circuit to the three-phase inverter circuit. (Refer to...) Figure 4 , Figure 4 This diagram illustrates a connection of the motor and resonant heating control method of this application. The resonant heating circuit is connected to the three-phase inverter circuit via the on-state switch S7, and subsequent heating control is executed. Specifically, the electromagnetic heating power is controlled by a determined carrier frequency, and the motor power is controlled by the effective duty cycle of the motor. Furthermore, by adding a low-speed switch, the motor controls the inverter circuit to achieve the electromagnetic heating function, and a half-bridge scheme is used for electromagnetic heating, reducing the voltage and current stress on the power devices in the half-bridge where the electromagnetic heating is located. Conversely, when no heating command is received, the on-state switch is controlled to disconnect the three-phase inverter circuit. That is, the on-state switch S7 disconnects the resonant heating circuit from the three-phase inverter circuit. At this time, the three-phase inverter circuit can either control the motor independently or remain inactive. The heating command refers to a user-input command to control the resonant heating circuit, or the user can directly control the on / off state of S7. The independent control of the motor by the three-phase inverter circuit can be the same as existing control methods and will not be described here. Further explanation of the simultaneous control of the resonant heating circuit and the motor can be found in [reference needed]. Figure 5 , Figure 5This is a schematic diagram of an implementation process of the control method for motor and resonant heating in this application. When simultaneous control is required, the motor control program is started, and S1-S6 are normally determined. At the same time, the resonant heating circuit is connected to the three-phase inverter circuit by controlling S7 to be normally open. At this time, the bus voltage Udc can be collected. Combined with the expected power P0 of resonant heating and the parameters in the resonant heating circuit, such as resistance, capacitance, and inductance, the carrier frequency is calculated in formula (1), and then the carrier frequency is updated to ensure that the resonant heating circuit can achieve motor control and resonant heating circuit control at the expected power P0 at low cost. It is worth noting that if no heating command is received and motor control is required at this time, S7 will be disconnected, and S1-S6 can be driven normally.

[0077] In one embodiment, the three-phase inverter circuit includes a first switch and a second switch on the inverter half-bridge connected to the resonant heating circuit. After the step of controlling the conduction switch to connect to the three-phase inverter circuit upon receiving a heating command, the following steps are included:

[0078] Step S111: When a heating command is received but no motor operation command is received, the first and second switching transistors are controlled to operate at a preset duty cycle, and under the control operation, the step of obtaining control parameter information of the compressor controller is executed.

[0079] In this embodiment, upon receiving a heating command, after controlling the switching transistors connected to the three-phase inverter circuit, in addition to determining whether control of the resonant heating circuit is required, it also determines whether motor control is needed. If motor control is required, the step of obtaining control parameter information from the compressor controller will be directly executed. Conversely, if only control of the resonant heating circuit is needed, the switching transistors in the three-phase inverter circuit will be controlled. Specifically, the first and second switching transistors on the inverter half-bridge connected to the resonant heating circuit will be controlled to operate with a preset duty cycle. Here, the first and second switching transistors refer to the switching transistors on both sides of the midpoint of the bridge arm connected to the resonant heating circuit. The preset duty cycle can be a complementary turn-on with a 50% duty cycle and dead zone. It is worth noting that since no motor operation is required at this time, it is necessary to control S3, S4, S5, and S6 to be turned off. Further details can be found in the following section. Figure 6 , Figure 6This is another implementation flow diagram of the control method for motor and resonant heating in this application. When it is necessary to control the resonant heating circuit separately, S3, S4, S5 and S6 are controlled to be closed, while S7 is normally open. At the same time, S1 and S2 are controlled to be turned on complementaryly with a 50% duty cycle and dead zone. At this time, the motor is controlled to be in standby mode. That is, when S1 and S2 are turned on complementaryly with a 50% duty cycle and dead zone, it is impossible to form a resonant circuit between the three-phase inverter circuit and the three input terminals of the motor to control the motor. Therefore, the motor is in standby mode. In other words, when S1 and S2 are turned on complementaryly with a 50% duty cycle and dead zone, the resonant heating circuit can be controlled to form a resonant circuit. Of course, the actual duty cycle of S1 and S2 can be selected according to the actual situation, which is not limited here. At this point, the control process of the resonant heating circuit will continue to be executed, that is, the bus voltage Udc is collected, and the desired resonant heating power P0 and the parameters in the resonant heating circuit, such as resistance value, capacitance value, inductance value, etc., are combined to calculate the carrier frequency in formula (1), and then update the carrier frequency to ensure that the resonant heating circuit can achieve the desired power P0 at low cost in the existing three-phase inverter circuit.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] like Figure 7As 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.

[0084] exist Figure 7 In 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.

[0085] 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:

[0086] Information acquisition module A01 is used to acquire control parameter information of the compressor controller, wherein the control parameter information includes the bus voltage of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and the preset expected power value;

[0087] Frequency determination module A02 is used to determine the carrier frequency value based on the desired power value, the bus voltage, and the circuit control parameters;

[0088] The carrier control module A03 is used to control the motor and the resonant heating circuit according to the carrier frequency value.

[0089] 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.

[0090] The present invention also provides a computer-readable storage medium.

[0091] 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.

[0092] 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.

[0093] The computer program product provided in this application can solve the technical problem of realizing motor control and heating functions at low cost. Compared with the prior art, the beneficial effects of the computer program product 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.

[0094] 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 a vehicle-mounted compressor, which includes a compressor controller, a motor M and a compression unit, wherein the compressor controller is connected to the motor M and the motor is connected to the compression unit.

[0095] The compressor controller includes a three-phase inverter circuit 20, a resonant heating circuit 10, and a controller. 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 controller is connected to the three-phase inverter circuit 20 and the resonant heating circuit 10. The output terminal of the three-phase inverter circuit 20 is connected to the motor M. The compressor controller (executed within the controller) performs the above-described control method for the motor and resonant heating.

[0096] 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: acquiring control parameter information of the compressor controller, wherein the control parameter information includes the bus voltage of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and the preset desired power value; determining the carrier frequency value based on the desired power value, the bus voltage, and the circuit control parameters; and controlling the motor and the resonant heating circuit based on the carrier frequency value. Thus, on the one hand, heating through the resonant heating circuit can avoid the short-circuit safety problem caused by PTC heating; on the other hand, 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 carrier frequency value based on the desired power value, the bus voltage, and the circuit control parameters, and then controlling the motor and the resonant heating circuit based on the carrier frequency value, 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 can be reduced, thereby achieving motor control and heating functions at low cost. It is worth noting that the three-phase inverter circuit 20 and the resonant heating circuit 10 can also be set in other locations, such as a fan with heating function. In other words, as long as there is an inverter circuit with motor control and there is a heating requirement, the three-phase inverter circuit 20 and the resonant heating circuit 10 of this application can be set up and the motor and resonant heating control method of this application can be executed. No specific application scenario or instrument is limited here.

[0097] 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.

[0098] Furthermore, based on the first embodiment of the vehicle-mounted compressor of this application described above, referring to... Figure 4 The second embodiment of the vehicle-mounted compressor proposed in this application includes a resonant heating circuit 10 comprising:

[0099] 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.

[0100] Resonant capacitor C1, with its first terminal connected to the second terminal of the equivalent resistance R1;

[0101] Resonant inductor L1, with its first terminal connected to the second terminal of resonant capacitor C1;

[0102] Turn on the switch S7. The first end of the switch S7 is connected to the second end of the resonant inductor L1. The second end of the switch S7 is connected to the second end of any one of the inverter half-bridges in the three-phase inverter circuit 20.

[0103] 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 selection of the equivalent resistance R1, resonant capacitor C1, and resonant inductor L1 can be chosen 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 (control terminal) of the switching transistor S7 to control its on / off state, thereby enabling the operation and standby of the resonant heating circuit 10. In this case, the heating control and motor control functions of the resonant heating circuit 10 can be decoupled through the switching transistor S7, ensuring efficient and interference-free implementation of both functions. It is worth noting that the above is only one connection relationship between the equivalent resistance R1, resonant capacitor C1, resonant inductor L1 and conducting switch S7. Other connection relationships are also possible, such as setting the conducting switch S7 at the first end of the equivalent resistance R1. Adaptive connections can also be made according to the actual situation and user selection, which are not limited here.

[0104] 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.

[0105] 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:

[0106] Motor controller;

[0107] The first end of the first inverter bridge arm 21 is connected to the external power supply V. DC The positive terminal is connected, and the second end of the first inverter bridge arm 21 is connected to the external power supply V. DC The negative terminal is connected, and the midpoint of the first inverter bridge arm 21 is connected to the first phase input terminal W.

[0108] The first end of the second inverter bridge arm 22 is connected to the external power supply V. DC The positive terminal is connected, and the second end of the second inverter bridge arm 22 is connected to the external power supply V. DC The negative terminal is connected, and the midpoint of the second inverter bridge arm 22 is connected to the second phase input terminal V;

[0109] The third terminal of the third inverter bridge arm 23 is connected to the external power supply V. DCThe positive terminal is connected, and the second end of the third inverter bridge arm 23 is connected to the external power supply V. DC The negative terminal is connected, and the midpoint 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.

[0110] For example, 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 U, the second phase input terminal V and the third phase input terminal W 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. Therefore, based on the above three-phase inverter circuit 20, the motor M can be controlled normally. Simultaneously, the resonant heating circuit 10 shares its internal half-bridge, thus enabling resonant heating of the resonant heating circuit 10. It is also worth noting that the external power supply V... DC The device used to provide bus voltage, 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 an upper bridge or a lower bridge, that is, the upper bridge or lower bridge of each bridge arm can be connected to the resonant heating circuit 10. That is, the two ends of the resonant heating circuit can be connected between the midpoint of a bridge arm and the positive terminal of the power supply, or between the midpoint of the bridge arm and the negative terminal of the power supply. Moreover, the number of resonant heating circuits 10 can be selected according to actual needs.

[0111] In one embodiment, the compressor controller is further provided with a sampling circuit, which includes a first sampling circuit connected to the first inverter bridge arm 21, a second sampling circuit connected to the second inverter bridge arm 22, and a third sampling circuit connected to the third inverter bridge arm 23. The first sampling circuit, the second sampling circuit, and the third sampling circuit are composed of sampling resistors and sampling operational amplifiers.

[0112] In this embodiment, since current may be required in the entire motor control, corresponding sampling circuits can be set up and connected to the corresponding inverter bridge arms. For example, the equivalent sampling resistor RX can work with the sampling operational amplifier to acquire the power supply current ibus of the external power supply Vdc; the second sampling resistor RV can work with the sampling operational amplifier to acquire the second phase current lv of the second phase input terminal V; and the third sampling resistor RU can work with the sampling operational amplifier to acquire the third phase current lu of the third phase input terminal U. It is worth noting that a fourth sampling circuit can also be designed. The fourth sampling resistor RL in the fourth sampling circuit can work with the sampling operational amplifier to acquire the second sampling current (the current flowing through the resonant heating circuit 10) lReq, and... Figure 4 The first sampling resistor, not explicitly shown, can be used in conjunction with a sampling operational amplifier to acquire the first-phase current at the first-phase input terminal W. The composition of its first, second, and third sampling circuits can be any commonly used sampling circuit, and is not limited here. It is worth noting that because the motor's half-bridge is used for electromagnetic heating, the phase current using the lower bridge arm sampling resistor will be interfered with during motor and electromagnetic heating operation. Simultaneously, the phase current reconstructed using bus current sampling will also be interfered with. For the reliability of motor control, lower bridge arm resistance sampling is not performed in the electromagnetic heating half-bridge, but in the other two phases. Bus current sampling is only used for current protection, protecting power devices.

[0113] The device provided in this application can solve the technical problem of achieving motor control and heating functions at low cost. 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.

[0114] This application also provides a vehicle that includes the aforementioned on-board compressor.

[0115] It is worth noting that the vehicle-mounted compressor can be installed in the vehicle to solve the technical problem of achieving motor control and heating functions at low cost. It is also worth noting that other hardware can be included 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.

[0116] The device provided in this application can solve the technical problem of achieving motor control and heating functions at low cost. Compared with the prior art, the beneficial effects of the vehicle 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.

[0117] 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, wherein the control parameter information includes the bus voltage of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and the preset expected power value; The carrier frequency value is determined based on the desired power value, the bus voltage, and the circuit control parameters. The motor and the resonant heating circuit are controlled according to the carrier frequency value.

2. The control method for motor and resonant heating as described in claim 1, characterized in that, The circuit control parameters include the resistance value of the equivalent resistor in the resonant heating circuit, the capacitance value of the resonant capacitor, and the inductance value of the resonant inductor. The step of determining the carrier frequency value based on the desired power value, the bus voltage, and the circuit control parameters includes: The resonant angular frequency is determined based on the capacitance and inductance values, and the quality factor is determined based on the resonant angular frequency, capacitance, and inductance values. Based on the quality factor, the resistance value, the desired power value, and the bus voltage, the carrier frequency value is determined in the preset electromagnetic heating rules.

3. The control method for motor and resonant heating as described in claim 1, characterized in that, The resonant heating circuit includes a switching transistor for connecting or disconnecting from the three-phase inverter circuit. Prior to the step of obtaining the control parameter information of the compressor controller, the following steps are included: Upon receiving a heating command, the system controls the on-switch transistor to connect to the three-phase inverter circuit and executes the step of obtaining the control parameter information of the compressor controller. When no heating command is received, the control switch transistor is used to disconnect the three-phase inverter circuit.

4. The control method for motor and resonant heating as described in claim 3, characterized in that, The three-phase inverter circuit includes a first switch and a second switch on the inverter half-bridge connected to the resonant heating circuit. After the step of controlling the conduction switch to connect to the three-phase inverter circuit upon receiving a heating command, the following steps are included: When the heating command is received but the motor operation command is not received, the first and second switching transistors are controlled to operate with a preset duty cycle, and under the control operation, the step of obtaining the control parameter information of the compressor controller is executed.

5. The control method for motor and resonant heating as described in any one of claims 1 to 4, characterized in that, The step of controlling the motor and the resonant heating circuit according to the carrier frequency value includes: The resonant heating circuit is controlled based on the carrier frequency value; Determine the waveform duty cycle corresponding to the carrier frequency value, and control the motor based on the waveform duty cycle.

6. 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 includes a three-phase inverter circuit, a resonant heating circuit, and a controller. The resonant heating circuit is connected in series with any one of the inverter half-bridges in the three-phase inverter circuit. The controller is connected to both the three-phase inverter circuit and the resonant heating 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 5.

7. The vehicle-mounted compressor as described in claim 6, 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, wherein the first end of the resonant inductor is connected to the second end of the resonant capacitor; A switching transistor is provided, the first end of which is connected to the second end of the resonant inductor, 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.

8. The vehicle-mounted compressor as described in claim 6, 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. 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.

9. The vehicle-mounted compressor as described in claim 8, 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 further 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.

10. The vehicle-mounted compressor as described in claim 8, characterized in that, The compressor controller is further provided with a sampling circuit, which includes a first sampling circuit connected to the first inverter bridge arm, a second sampling circuit connected to the second inverter bridge arm, and a third sampling circuit connected to the third inverter bridge arm. The first sampling circuit, the second sampling circuit, and the third sampling circuit are composed of sampling resistors and sampling operational amplifiers.

11. A vehicle, characterized in that, The vehicle includes the on-board compressor as described in any one of claims 6 to 10.

Images