Control circuit of motor and resonant heating, vehicle-mounted compressor and vehicle
Patent Information
- Application Number
- CN202422800583.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2026-08-28
- Estimated Expiration
- 2034-11-15
AI Technical Summary
[0005]本申请的主要目的在于提供一种电机与谐振加热的控制电路、车载压缩机及车辆，旨在解决电机控制与加热功能的实现成本较高的技术问题
[0038]本申请实施例提供了一种电机与谐振加热的控制电路，包括谐振加热电路；三相逆变电路，三相逆变电路的输入端与外部电源连接，三相逆变电路中目标逆变桥臂的桥臂中点与谐振加热电路的第一端连接，目标逆变桥臂的第一端与谐振加热电路的第二端连接，其中，目标逆变桥臂的第一端和目标逆变桥臂的第二端与外部电源连接；电机，电机与三相逆变电路的输出端连接；电机控制器，电机控制器的控制端与三相逆变电路中的开关管连接，其中，目标逆变桥臂包括两个串联的开关管，电机控制器用于控制电机和控制谐振加热电路进行谐振加热，这种电机与谐振加热的控制电路通过三相逆变电路中目标逆变桥臂的桥臂中点与谐振加热电路的第一端连接，目标逆变桥臂的第一端与谐振加热电路的第二端连接，同时电机与三相逆变电路的输出端连接，进而可以基于电机控制器控制电机和控制谐振加热电路进行谐振加热，从而避免了电机控制与加热功能的实现需要使用各自的控制器及控制电路(包括PTC加热器、车载PTC加热器控制器、电机控制器和逆变电路)的现象，这种电机与谐振加热的控制电路通过将谐振加热电路连接到原有的三相逆变电路(本身三相逆变电路就可以用来控制电机)中，进而通过电机控制器来实现对谐振加热电路的谐振加热控制，可以减少PTC加热器(替换为谐振加热电路进行加热)、车载PTC加热器控制器、PTC加热器的控制电路的使用，进而降低电机控制与加热功能的实现成本。
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Abstract
Description
Technical Field
[0001] This application relates to the field of motor control and resonant heating technology, and in particular to a control circuit for a motor and resonant heating, an on-board compressor, and a vehicle. Background Technology
[0002] As motor control and heating technology are increasingly used in various fields, users are also placing higher demands on the implementation of motor control and heating functions.
[0003] Traditional motor control and heating functions are implemented through 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 method has significant drawbacks, as it necessitates the use of separate controllers and control circuits for each motor control and heating function (including the PTC heater, the onboard PTC heater controller, the PTC heater control circuit, the motor controller, and the inverter circuit). This results in high implementation costs for the 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. Utility Model Content
[0005] The main purpose of this application is to provide a control circuit for a motor and resonant heating, an on-board compressor, and a vehicle, aiming to solve the technical problem of high implementation cost of motor control and heating functions.
[0006] To achieve the above objectives, this application provides a control circuit for a motor and resonant heating, the control circuit for the motor and resonant heating comprising:
[0007] Resonant heating circuit;
[0008] A three-phase inverter circuit, wherein the input terminal of the three-phase inverter circuit is connected to an external power supply, the midpoint of the target inverter bridge arm in the three-phase inverter circuit is connected to the first end of the resonant heating circuit, and the first end of the target inverter bridge arm is connected to the second end of the resonant heating circuit, wherein the first end and the second end of the target inverter bridge arm are connected to the external power supply.
[0009] An electric motor, which is connected to the output terminal of the three-phase inverter circuit;
[0010] A motor controller, the control terminal of which is connected to the switching transistors in the three-phase inverter circuit, wherein the target inverter bridge arm includes two switching transistors connected in series, and the motor controller is used to control the motor and control the resonant heating circuit to perform resonant heating.
[0011] In one embodiment, the resonant heating circuit includes:
[0012] Equivalent resistance, the first end of which is connected to the midpoint of the target inverter bridge arm;
[0013] A resonant capacitor, wherein the first terminal of the resonant capacitor is connected to the second terminal of the equivalent resistor;
[0014] 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 first end of the target inverter bridge arm.
[0015] In one embodiment, the resonant heating circuit further includes:
[0016] A switching transistor is provided, with its first end connected to the second end of the resonant inductor, its second end connected to the first end of the target inverter bridge arm, and its third end connected to the control terminal of the motor controller.
[0017] 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, and the target inverter bridge arm includes at least one of the first inverter bridge arm, the second inverter bridge arm, and the third inverter bridge arm, wherein one of the resonant heating circuits is connected to one of the target inverter bridge arms.
[0018] In one embodiment, when the target inverter arm is the first inverter arm, the first end of the target inverter arm is the first end of the first inverter arm, or the first end of the target inverter arm is the second end of the first inverter arm.
[0019] In one embodiment, the motor includes a first phase input terminal, a second phase input terminal, and a third phase input terminal;
[0020] 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.
[0021] 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.
[0022] 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.
[0023] In one embodiment, the first inverter arm includes:
[0024] The first switching transistor has its first end connected to the positive terminal of the external power supply and its third end connected to the control terminal of the motor controller.
[0025] The second switch has its first end connected to the second end of the first switch and the first phase input terminal, its second end connected to the negative terminal of the external power supply, and its third end connected to the control terminal of the motor controller.
[0026] The second inverter arm includes:
[0027] The third switch is connected to the positive terminal of the external power supply at its first end and to the control terminal of the motor controller at its third end.
[0028] The fourth switch has its first terminal connected to the second terminal of the third switch and the second phase input terminal, its second terminal connected to the negative terminal of the external power supply, and its third terminal connected to the control terminal of the motor controller.
[0029] The third inverter bridge arm includes:
[0030] The fifth switching transistor has its first terminal connected to the positive terminal of the external power supply and its third terminal connected to the control terminal of the motor controller.
[0031] The sixth switch has its first end connected to the second end of the fifth switch and the third phase input terminal, its second end connected to the negative terminal of the external power supply, and its third end connected to the control terminal of the motor controller.
[0032] In one embodiment, the three-phase inverter circuit includes a first output terminal, a second output terminal, and a third output terminal, and the control circuit for the motor and resonant heating further includes:
[0033] A first current sampling circuit is disposed between the first output terminal and the motor;
[0034] A second current sampling circuit is disposed between the second output terminal and the motor.
[0035] The third current sampling circuit is disposed between the third output terminal and the motor.
[0036] In addition, to achieve the above objectives, a vehicle-mounted compressor is also 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 control circuit for the motor and resonant heating as described above.
[0037] In addition, to achieve the above objectives, a vehicle is also provided, the vehicle including the aforementioned on-board compressor.
[0038] This application provides a control circuit for a motor and resonant heating, including a resonant heating circuit; a three-phase inverter circuit, the input terminal of which is connected to an external power supply, the midpoint of a target inverter bridge arm in the three-phase inverter circuit being connected to a first terminal of the resonant heating circuit, and the first terminal of the target inverter bridge arm being connected to a second terminal of the resonant heating circuit, wherein the first and second terminals of the target inverter bridge arm are connected to an external power supply; a motor, the motor being connected to the output terminal of the three-phase inverter circuit; and a motor controller, the control terminal of which is connected to a switching transistor in the three-phase inverter circuit, wherein the target inverter bridge arm includes two switching transistors connected in series. The motor controller is used to control the motor and the resonant heating circuit to perform resonant heating. This control circuit for the motor and resonant heating connects the midpoint of the target inverter bridge arm in the three-phase inverter circuit to the first terminal of the resonant heating circuit, and the target inverter bridge arm is connected to a second terminal of the resonant heating circuit. The first end of the variable bridge arm is connected to the second end of the resonant heating circuit, while the motor is connected to the output end of the three-phase inverter circuit. This allows the motor and resonant heating circuit to be controlled by the motor controller, thus avoiding the need for separate controllers and control circuits (including the PTC heater, vehicle-mounted PTC heater controller, motor controller, and inverter circuit) for motor control and heating functions. This motor and resonant heating control circuit connects the resonant heating circuit to the existing three-phase inverter circuit (which itself can be used to control the motor), and then uses the motor controller to control the resonant heating circuit. This reduces the need for the PTC heater (replaced by the resonant heating circuit), the vehicle-mounted PTC heater controller, and the PTC heater control circuit, thereby lowering the cost of implementing motor control and heating functions. Attached Figure Description
[0039] Figure 1 This is a schematic diagram of the framework of the first embodiment of the control circuit for motor and resonant heating in this application;
[0040] Figure 2 A schematic diagram of the connection of an existing heating control circuit;
[0041] Figure 3 This is another connection diagram of the existing heating control circuit;
[0042] Figure 4 This is an equivalent schematic diagram of an existing heating control circuit.
[0043] Figure 5 This is a schematic diagram of the connection of the resonant heating circuit in the control circuit of the motor and resonant heating in this application.
[0044] Figure 6 This is a schematic diagram of the connection of a three-phase inverter circuit in the control circuit for motor and resonant heating of this application.
[0045] Figure 7 This is a schematic diagram showing the connection between the motor and the control circuit for resonant heating according to a first embodiment of this application;
[0046] Figure 8 This is a schematic diagram showing the connection between the motor and the control circuit for resonant heating according to a second embodiment of this application;
[0047] Figure 9 This is a schematic diagram showing the connection between the motor and the control circuit for resonant heating according to a third embodiment of this application.
[0048] 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.
[0049] Explanation of icon numbers:
[0050] 100 (Vdc), external power supply; 10, resonant heating circuit; 20, three-phase inverter circuit; 30, motor controller; M, motor; S1, first switch; S2, second switch; S3, third switch; S4, fourth switch; S5, fifth switch; S6, sixth switch; R1 (R2, R3), equivalent resistance; C1 (C2, C3), resonant capacitor; L1 (L2, L3, Leq), resonant inductor; S7 (S8, S9), conducting switch; 21, first inverter bridge arm; 22, second inverter bridge arm; 23, third inverter bridge arm; HV-, negative terminal of external power supply; HV+, positive terminal of external power supply; U, first phase input terminal (first output terminal); V, second phase input terminal (second output terminal); W, third phase input terminal (third output terminal); lu, first current sampling circuit; lv, second current sampling circuit; lw, third current sampling circuit. Detailed Implementation
[0051] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.
[0052] 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.
[0053] 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 setting 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 at the resonant frequency, while also achieving the highest efficiency. Further, refer 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 another connection diagram of the existing heating control circuit. The resonant heating circuit can be set in the upper half-bridge of the control topology, such as... Figure 4 , Figure 4 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.
[0054] Therefore, based on the shortcomings of the above-mentioned methods for implementing motor control and heating functions, this application proposes a control circuit for motor and resonant heating: the midpoint of the target inverter bridge arm in the three-phase inverter circuit is connected to the first end of the resonant heating circuit, the first end of the target inverter bridge arm is connected to the second end of the resonant heating circuit, and the motor is connected to the output end of the three-phase inverter circuit. Thus, the motor and the resonant heating circuit can be controlled by the motor controller for resonant heating, thereby avoiding the need for separate controllers and control circuits (including PTC heater, vehicle-mounted PTC heater controller, motor controller, and inverter circuit) for motor control and heating functions. This control circuit connects the resonant heating circuit to the existing three-phase inverter circuit (which itself can be used to control the motor), and then uses the motor controller to achieve resonant heating control of the resonant heating circuit. This reduces the use of the PTC heater (replaced by 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.
[0055] Based on this, the embodiments of this application provide a control circuit for a motor and resonant heating, referring to... Figure 1 , Figure 1 This is a schematic diagram of the framework of the first embodiment of the control circuit for motor and resonant heating in this application.
[0056] Reference Figure 1 This application provides a control circuit for a motor and resonant heating, the control circuit for a motor and resonant heating includes:
[0057] Resonant heating circuit 10;
[0058] Three-phase inverter circuit 20, the input terminal of three-phase inverter circuit 20 is connected to external power supply 100, the midpoint of the target inverter bridge arm in three-phase inverter circuit 20 is connected to the first end of resonant heating circuit 10, the first end of the target inverter bridge arm is connected to the second end of resonant heating circuit 10, wherein the first end and the second end of the target inverter bridge arm are connected to external power supply.
[0059] Motor M is connected to the output terminal of three-phase inverter circuit 20;
[0060] The motor controller 30 has its control terminal connected to the switching transistors in the three-phase inverter circuit 20. The target inverter bridge arm includes two switching transistors connected in series. The motor controller 30 is used to control the motor M and control the resonant heating circuit 10 to perform resonant heating.
[0061] In this embodiment, based on the above analysis of the PTC heater, and considering the similar circuits between the compressor controller (which contains an inverter circuit capable of controlling the motor) and the PTC controller, a control circuit for a motor with resonant heating and three-phase motor control is proposed. The resonant heating circuit 10 is then connected to the target inverter arm in the three-phase inverter circuit 20. The connection method can be as follows: Figure 2 or Figure 3 The connection method of the upper and lower bridge arms is as follows: the midpoint of the target inverter bridge arm is connected to the first end of the resonant heating circuit 10, and the first end of the target inverter bridge arm is connected to the second end of the resonant heating circuit 10. For example, if the target inverter bridge arm is the first inverter bridge arm in the three-phase inverter circuit 20, the resonant heating circuit 10 can be connected to either the upper or lower bridge arm of the first inverter bridge arm. The connection position of the resonant heating circuit 10 is not limited here. Meanwhile, the output terminal of the three-phase inverter circuit 20 is still normally connected to the motor M, thus enabling normal motor control. At this time, the switching transistors in the three-phase inverter circuit 20 can be normally connected to the motor controller 30. Figure 1 For example, when the motor controller 30 controls the first switch S1 to turn on and the second switch S2 to turn off (assuming the fourth switch S4 is on during motor control), the current will flow normally through the first switch S1. This current will then flow to the resonant heating circuit 10, enabling it to heat normally, and simultaneously flow to the motor M, passing through the fourth switch S4 to ensure the motor M operates normally. Therefore, the motor M and the resonant heating circuit 10 can be controlled for resonant heating based on the control of the switches in the three-phase inverter circuit 20 by the motor controller 30. It is worth noting that the motor and resonant heating control circuit can also be set in other existing inverter circuits, sharing the half-bridge in the inverter circuit to achieve both the original inverter circuit function and the resonant heating function. The entire motor and resonant heating control circuit can eliminate the PTC heater, achieving resonant heating through the existing half-bridge in the three-phase inverter circuit 20 connected to the resonant heating circuit 10. This reduces the use of the PTC heater and its controller when implementing motor control and heating functions, significantly reducing the overall size and cost of the motor and resonant heating control circuit.
[0062] In this embodiment, a control circuit for a motor and resonant heating is provided, including a resonant heating circuit; a three-phase inverter circuit, the input terminal of which is connected to an external power supply, the midpoint of the target inverter bridge arm in the three-phase inverter circuit being connected to a first terminal of the resonant heating circuit, and the first terminal of the target inverter bridge arm being connected to a second terminal of the resonant heating circuit, wherein the first and second terminals of the target inverter bridge arm are connected to an external power supply; a motor connected to the output terminal of the three-phase inverter circuit; and a motor controller, the control terminal of which is connected to a switching transistor in the three-phase inverter circuit, wherein the target inverter bridge arm includes two switching transistors connected in series. The motor controller is used to control the motor and the resonant heating circuit to perform resonant heating. This control circuit for the motor and resonant heating connects the midpoint of the target inverter bridge arm in the three-phase inverter circuit to the first terminal of the resonant heating circuit, and the target inverter bridge arm is connected to a second terminal of the resonant heating circuit. The first end of the variable bridge arm is connected to the second end of the resonant heating circuit, while the motor is connected to the output end of the three-phase inverter circuit. This allows the motor and resonant heating circuit to be controlled by the motor controller, thus avoiding the need for separate controllers and control circuits (including the PTC heater, vehicle-mounted PTC heater controller, motor controller, and inverter circuit) for motor control and heating functions. This motor and resonant heating control circuit connects the resonant heating circuit to the existing three-phase inverter circuit (which itself can be used to control the motor), and then uses the motor controller to control the resonant heating circuit. This reduces the need for the PTC heater (replaced by the resonant heating circuit), the vehicle-mounted PTC heater controller, and the PTC heater control circuit, thereby lowering the cost of implementing motor control and heating functions.
[0063] Furthermore, based on the first embodiment of this application described above, a second embodiment of the control circuit for the motor and resonant heating of this application is proposed, referring to... Figure 5 , Figure 5 This is a schematic diagram of the connection between the motor and the resonant heating circuit in the control circuit of the resonant heating of this application. The resonant heating circuit 10 includes:
[0064] The equivalent resistance R1 is connected to the midpoint of the target inverter bridge arm.
[0065] Resonant capacitor C1, with its first terminal connected to the second terminal of the equivalent resistance R1;
[0066] The first end of the resonant inductor L1 is connected to the second end of the resonant capacitor C1, and the second end of the resonant inductor L1 is connected to the first end of the target inverter bridge arm.
[0067] Furthermore, the resonant heating circuit 10 also includes:
[0068] The first terminal of the turn-on switch S7 is connected to the second terminal of the resonant inductor L1, the second terminal of the turn-on switch S7 is connected to the first terminal of the target inverter bridge arm, and the third terminal of the turn-on switch S7 is connected to the control terminal of the motor controller 30.
[0069] 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.
[0070] Furthermore, based on the first and / or second embodiments of this application described above, a third embodiment of the control circuit for the motor and resonant heating of this application is proposed, referring to... Figure 7 , Figure 7 This is a schematic diagram of the connection between the motor and the control circuit for resonant heating in the first embodiment of this application. 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 target inverter bridge arm includes at least one of the first inverter bridge arm 21, the second inverter bridge arm 22 and the third inverter bridge arm 23. A resonant heating circuit 10 is connected to a target inverter bridge arm.
[0071] In one embodiment, when the target inverter arm is the first inverter arm 21, the first end of the target inverter arm is the first end of the first inverter arm 21, or the first end of the target inverter arm is the second end of the first inverter arm 21.
[0072] For example, refer to Figure 7The target inverter bridge arm includes at least one of the first inverter bridge arm 21, the second inverter bridge arm 22, and the third inverter bridge arm 23. That is, each of the three inverter bridge arms can be equipped with a resonant heating circuit 10, thereby enabling the control of multiple resonant heating circuits 10. Simultaneously, the resonant heating circuit 10 can be freely selected to be located on the upper or lower bridge of a certain inverter bridge arm. That is, the first end of the target inverter bridge arm is the first end of the first inverter bridge arm 21, or the first end of the target inverter bridge arm is the second end of the first inverter bridge arm 21. In the extreme case, a resonant heating circuit 10 can be set on both the upper and lower bridges of the three inverter bridge arms, meaning a maximum of six resonant heating circuits 10 can be set. Further, referring to 8, Figure 8 This is a schematic diagram of the connection of the control circuit for motor and resonant heating in the second embodiment of this application. In each resonant heating circuit 10, there are conducting switches S7, S8 and S9 to control the opening and closing of the corresponding resonant heating circuit 10 respectively. If all are turned off, the compressor controller is no different from a normal three-phase inverter circuit for controlling the motor. The first switch S1 to the sixth switch S6 control the motor to run. At the same time, the lower bridge switches S2, S4 and S6 control the motor and the current flowing into the corresponding resonant circuit to realize resonant heating. Thus, motor control and resonant heating are realized based on the entire control circuit for motor and resonant heating, so that the two functions do not need to be controlled separately (using corresponding control devices and circuits respectively), thereby reducing the implementation cost of motor control and heating functions.
[0073] In one embodiment, reference is made to Figure 9 , Figure 9 This is a schematic diagram of the connection of the control circuit for the motor and resonant heating according to the third embodiment of this application. The three-phase inverter circuit 20 includes a first output terminal U, a second output terminal V, and a third output terminal W. The control circuit for the motor and resonant heating also includes:
[0074] The first current sampling circuit lu is set between the first output terminal U and the motor M.
[0075] The second current sampling circuit lv is set between the second output terminal V and the motor M.
[0076] The third current sampling circuit lw is located between the third output terminal W and the motor M.
[0077] In this embodiment, the three-phase inverter circuit includes a first output terminal U, a second output terminal V, and a third output terminal W. Since a series resonant heating circuit 10 is added to the three-phase inverter circuit 20, the current flowing through the lower bridge may be the sum of the current in a certain phase and the current flowing through the resonant heating circuit 10. Therefore, the phase current needs to be sampled directly from the three-phase lines, such as... Figure 9The three-phase current sampling module is described. The first current sampling circuit lu, the second current sampling circuit lv, and the third current sampling circuit lw can be composed of sampling resistors and sampling operational amplifiers (i.e., the composition of a resistor sampling circuit in a common inverter circuit). Their composition can be the same as existing commonly used three-phase current sampling circuits, and no limitations are imposed on lu, lv, and lw here. The placement of lu, lv, and lw ensures the accuracy of phase current acquisition while simultaneously enabling motor control and resonant heating in the entire circuit.
[0078] Furthermore, based on the first, second, and / or third embodiments of this application described above, a fourth embodiment of the control circuit for the motor and resonant heating of this application is proposed, referring to... Figure 6 , Figure 6 This is a schematic diagram of the connection of a three-phase inverter circuit in the control circuit of the motor and resonant heating of this application. The motor M includes a first phase input terminal U, a second phase input terminal V and a third phase input terminal W.
[0079] The first end of the first inverter bridge arm 21 is connected to the positive terminal HV+ of the external power supply 100, the second end of the first inverter bridge arm 21 is connected to the negative terminal HV- of the external power supply 100, and the midpoint of the first inverter bridge arm 21 is connected to the first phase input terminal U.
[0080] The first end of the second inverter bridge arm 22 is connected to the positive terminal HV+ of the external power supply 100, the second end of the second inverter bridge arm 22 is connected to the negative terminal HV- of the external power supply 100, and the midpoint of the bridge arm of the second inverter bridge arm 22 is connected to the second phase input terminal V.
[0081] The third end of the third inverter bridge arm 23 is connected to the positive terminal HV+ of the external power supply 100, the second end of the third inverter bridge arm 23 is connected to the negative terminal HV- of the external power supply 100, and the midpoint of the bridge arm of the third inverter bridge arm 23 is connected to the third phase input terminal W.
[0082] Furthermore, the first inverter arm 21 includes:
[0083] The first switch S1 has its first terminal connected to the positive terminal HV+ of the external power supply 100, and its third terminal connected to the control terminal of the motor controller 30.
[0084] The second switch S2 has its first end connected to the second end of the first switch S1 and the first phase input terminal U. The second end of the second switch S2 is connected to the negative terminal HV- of the external power supply 100. The third end of the second switch S2 is connected to the control terminal of the motor controller 30.
[0085] The second inverter arm 22 includes:
[0086] The third switch S3 has its first terminal connected to the positive terminal HV+ of the external power supply 100, and its third terminal connected to the control terminal of the motor controller 30.
[0087] The first terminal of the fourth switch S4 is connected to the second terminal of the third switch S3 and the second phase input terminal V. The second terminal of the fourth switch S4 is connected to the negative terminal HV- of the external power supply 100. The third terminal of the fourth switch S4 is connected to the control terminal of the motor controller 30.
[0088] The third inverter arm 23 includes:
[0089] The fifth switch S5 has its first terminal connected to the positive terminal HV+ of the external power supply 100, and its third terminal connected to the control terminal of the motor controller 30.
[0090] The sixth switch S6 has its first terminal connected to the second terminal of the fifth switch S5 and the third phase input terminal W. The second terminal of the sixth switch S6 is connected to the negative terminal HV- of the external power supply 100. The third terminal of the sixth switch S6 is connected to the control terminal of the motor controller 30.
[0091] 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 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 switch S1 to the sixth switch S6 and the turn-on switches S7 to S9 can all be IGBTs (Insulated Gate Bipolar Transistors), MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), or other types. There is no restriction on the type of switch. Based on the above three-phase inverter circuit 20, the motor M can be controlled normally. At the same time, the resonant heating circuit 10 shares the internal half-bridge, thereby realizing the resonant heating of the resonant heating circuit 10.
[0092] This application also provides a vehicle-mounted compressor, 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 control circuit for the motor and resonant heating as described above.
[0093] It is worth noting that, according to the vehicle-mounted compressor of this utility model embodiment, the midpoint of the target inverter bridge arm in the three-phase inverter circuit of the vehicle-mounted compressor is connected to the first end of the resonant heating circuit, and the first end of the target inverter bridge arm is connected to the second end of the resonant heating circuit. At the same time, the motor is connected to the output end of the three-phase inverter circuit. Thus, the motor and the resonant heating circuit can be controlled by the motor controller to perform resonant heating. This avoids the phenomenon that the motor control and heating functions need to use their own controllers and control circuits (including PTC heater, vehicle-mounted PTC heater controller, motor controller and inverter circuit). This motor and resonant heating control circuit connects the resonant heating circuit to the original three-phase inverter circuit (the three-phase inverter circuit itself can be used to control the motor), and then uses the motor controller to realize the resonant heating control of the resonant heating circuit. This can reduce the use of PTC heater (replaced with resonant heating circuit for heating), vehicle-mounted PTC heater controller and PTC heater control circuit, thereby reducing the implementation cost of motor control and heating functions.
[0094] 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 circuit provided in the above embodiments, and will not be repeated here.
[0095] This application also provides a vehicle that includes the aforementioned on-board compressor.
[0096] It is worth noting that the vehicle-mounted compressor can be installed in the vehicle to control the motor based on the motor controller, and at the same time control the resonant heating circuit for resonant heating. The vehicle-mounted compressor has a motor and resonant heating control circuit inside. By connecting the resonant heating circuit to the original three-phase inverter circuit (which can itself be used to control the motor), and then using the motor controller to achieve resonant heating control of the resonant heating circuit, the use of PTC heater (replacing it with the resonant heating circuit), vehicle-mounted PTC heater controller, and PTC heater control circuit can be reduced, thereby reducing the cost of implementing motor control and heating functions.
[0097] It is worth noting that the vehicle may also include other hardware, which will not be described in detail here. The entire vehicle compressor can be installed on the vehicle or on other products, and there are no restrictions on this.
[0098] 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 circuit provided in the above embodiments, and will not be repeated here.
[0099] 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 circuit for a motor and resonant heating, characterized in that, The control circuit for the motor and resonant heating includes: Resonant heating circuit; A three-phase inverter circuit, wherein the input terminal of the three-phase inverter circuit is connected to an external power supply, the midpoint of the target inverter bridge arm in the three-phase inverter circuit is connected to the first end of the resonant heating circuit, and the first end of the target inverter bridge arm is connected to the second end of the resonant heating circuit, wherein the first end and the second end of the target inverter bridge arm are connected to the external power supply. An electric motor, which is connected to the output terminal of the three-phase inverter circuit; A motor controller, the control terminal of which is connected to the switching transistors in the three-phase inverter circuit, wherein the target inverter bridge arm includes two switching transistors connected in series, and the motor controller is used to control the motor and control the resonant heating circuit to perform resonant heating.
2. The control circuit for the motor and resonant heating as described in claim 1, characterized in that, The resonant heating circuit includes: Equivalent resistance, the first end of which is connected to the midpoint of the target inverter bridge arm; 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 first end of the target inverter bridge arm.
3. The control circuit for the motor and resonant heating as described in claim 2, characterized in that, The resonant heating circuit also includes: A switching transistor is provided, with its first end connected to the second end of the resonant inductor, its second end connected to the first end of the target inverter bridge arm, and its third end connected to the control terminal of the motor controller.
4. The control circuit for the motor and resonant heating as described in claim 1, 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 target inverter bridge arm includes at least one of the first inverter bridge arm, the second inverter bridge arm, and the third inverter bridge arm. Each of the resonant heating circuits is connected to one of the target inverter bridge arms.
5. The control circuit for the motor and resonant heating as described in claim 4, characterized in that, When the target inverter arm is the first inverter arm, the first end of the target inverter arm is the first end of the first inverter arm, or the first end of the target inverter arm is the second end of the first inverter arm.
6. The control circuit for the motor and resonant heating as described in claim 4, characterized in that, The motor includes a first phase input terminal, a second phase input terminal, and a third phase input terminal; 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.
7. The control circuit for the motor and resonant heating as described in claim 6, characterized in that, The first inverter arm includes: The first switching transistor has its first end connected to the positive terminal of the external power supply and its third end connected to the control terminal of the motor controller. The second switch has its first end connected to the second end of the first switch and the first phase input terminal, its second end connected to the negative terminal of the external power supply, and its third end connected to the control terminal of the motor controller. The second inverter arm includes: The third switch is connected to the positive terminal of the external power supply at its first end and to the control terminal of the motor controller at its third end. The fourth switch has its first terminal connected to the second terminal of the third switch and the second phase input terminal, its second terminal connected to the negative terminal of the external power supply, and its third terminal connected to the control terminal of the motor controller. The third inverter arm includes: The fifth switching transistor has its first terminal connected to the positive terminal of the external power supply and its third terminal connected to the control terminal of the motor controller. The sixth switch has its first end connected to the second end of the fifth switch and the third phase input terminal, its second end connected to the negative terminal of the external power supply, and its third end connected to the control terminal of the motor controller.
8. The control circuit for the motor and resonant heating as described in any one of claims 1 to 7, characterized in that, The three-phase inverter circuit includes a first output terminal, a second output terminal, and a third output terminal, and the control circuit for the motor and resonant heating further includes: A first current sampling circuit is disposed between the first output terminal and the motor; A second current sampling circuit is disposed between the second output terminal and the motor. The third current sampling circuit is disposed between the third output terminal and the motor.
9. 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 control circuit for the motor and resonant heating as described in any one of claims 1 to 8.
10. A vehicle, characterized in that, The vehicle includes the on-board compressor as described in claim 9.