CN111355434A

CN111355434A - Motor control circuit, vehicle and heating method thereof

Info

Publication number: CN111355434A
Application number: CN201811574196.XA
Authority: CN
Inventors: 凌和平; 张宇昕; 刘捷宇; 黄日; 赵志盟; 其他发明人请求不公开姓名
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2018-12-21
Filing date: 2018-12-21
Publication date: 2020-06-30
Anticipated expiration: 2038-12-21
Also published as: CN111355434B

Abstract

The application provides a motor control circuit, a vehicle and a heating method of the motor control circuit, wherein the motor control circuit comprises a three-phase inverter, a three-phase alternating current motor, an LC resonance module and a control module, a three-phase coil of the three-phase alternating current motor is connected with a three-phase bridge arm of the three-phase inverter, a connection point of the three-phase coil of the three-phase alternating current motor is connected with the LC resonance module, and the LC resonance module is connected with the three-phase inverter and a power supply module. This application technical scheme sets up LC resonance module in motor control circuit, and then makes LC resonance module, three-phase alternating current motor and three-phase inverter form resonant circuit, when acquireing and treat that the heating part needs to heat, control LC resonance module work makes the electric current flow through resonant circuit, and then make LC resonance module, three-phase inverter and three-phase alternating current motor be in operating condition in order to produce the heat, utilize this heat to treat the heating part and heat, heating efficiency is high, it is fast to make the heating part temperature of treating rise.

Description

Motor control circuit, vehicle and heating method thereof

Technical Field

The application relates to the technical field of automobiles, in particular to a motor control circuit, a vehicle and a heating method thereof.

Background

In recent years, new energy vehicles are developed vigorously, power batteries based on lithium ions are widely used, and due to the inherent characteristics of the batteries, the charge and discharge capacity of the power batteries is greatly reduced at low temperature, which affects the use of electric vehicles in cold regions.

In order to solve the problem, in the prior art, a technical scheme is that a battery management system acquires and sends the temperature of a power battery unit, if the temperature is lower than a preset temperature threshold value, a vehicle controller commands an engine controller to control an engine to rotate at a constant speed at a certain rotating speed through CAN communication, the engine drives a generator to rotate, and the power battery unit is rapidly charged and discharged through the generator to achieve the purpose of preheating a battery pack.

Another technical scheme in the prior art is that when the ambient temperature is low and the power battery needs to be heated, the heat exchange medium is pumped out by the water pump from the refrigerant liquid tank and is heated by the PTC heater and then is sent into the liquid cooling plate of the power battery, so that the temperature of the liquid cooling plate of the power battery is raised, and then the liquid cooling plate of the power battery heats the power battery, thereby improving the working performance of the power battery under the cold condition. In the technical scheme, a PTC heater is needed, so that the cost is increased, and if the PTC heater is damaged, the secondary cost is increased.

In summary, in the prior art, when a power battery or other to-be-heated components are heated in a low temperature state, the battery heating efficiency is low due to the fact that the engine is used for heating, and the cost is increased due to the fact that the PTC heater is used for heating.

Disclosure of Invention

The application aims to provide a motor control circuit, a vehicle and a heating method thereof, and aims to solve the problems that when a to-be-heated part is heated in a low-temperature state, an engine is adopted to heat the to-be-heated part, so that the heating efficiency of a battery is low, and a PTC heater is adopted to heat the to-be-heated part, so that the cost is increased in the prior art.

The application is realized like this, and the first aspect of this application provides a motor control circuit, motor control circuit includes three-phase inverter, three-phase alternating current motor, LC resonance module and control module, three-phase coil of three-phase alternating current motor connects the three-phase bridge arm of three-phase inverter, the tie point of three-phase coil of three-phase alternating current motor is connected LC resonance module, LC resonance module connects three-phase inverter and power module, power module still connects three-phase inverter, control module connects respectively three-phase inverter three-phase alternating current motor and power module.

In a second aspect, the present application provides a heating method for a power battery, based on the motor control circuit in the first aspect, the heating method includes:

when the temperature of the power battery is lower than a preset temperature value, the control module controls the on-off states of different power switch units in the three-phase inverter to enable energy to flow among the power supply module, the LC resonance module and a three-phase coil of the three-phase alternating current motor, so that heat exchange media flowing through at least one heat exchange medium pipeline in the LC resonance module, the three-phase inverter and the three-phase alternating current motor are heated.

A third aspect of the present application provides a vehicle including the motor control circuit of the first aspect

The application provides a motor control circuit, vehicle and heating method thereof, motor control circuit includes three-phase inverter, three-phase AC motor, LC resonance module and control module, three-phase coil of three-phase AC motor connects the three-phase bridge arm of three-phase inverter, the tie point of three-phase coil of three-phase AC motor connects LC resonance module, LC resonance module connects three-phase inverter and power module, power module still connects three-phase inverter, control module connects respectively three-phase inverter three-phase AC motor and power module. This application technical scheme sets up LC resonance module in motor control circuit, make LC resonance module and three-phase AC motor's the mid point of three-phase coil connection be connected, because three-phase AC motor is connected with three-phase inverter, and then make LC resonance module, three-phase AC motor and three-phase inverter form resonant circuit, when acquireing and treat that the heating block needs to heat, control LC resonance module work and make the electric current flow through resonant circuit, and then make LC resonance module, three-phase inverter and three-phase AC motor are in operating condition in order to produce the heat, it heats to treat the heating block to utilize this heat, need not use the engine or increase complicated circuit structure to motor control circuit and just can realize promoting power battery's temperature, and heating efficiency is high, it is fast to make and treat that the heating block temperature risees.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a motor control circuit according to an embodiment of the present application;

FIG. 2 is a schematic diagram of another configuration of a motor control circuit according to an embodiment of the present application;

FIG. 3 is a schematic diagram of another configuration of a motor control circuit according to an embodiment of the present application;

FIG. 4 is a circuit diagram of a motor control circuit according to an embodiment of the present application;

FIG. 5 is another circuit diagram of a motor control circuit according to an embodiment of the present application;

FIG. 6 is a further circuit diagram of a motor control circuit provided in one embodiment of the present application;

FIG. 7 is a further circuit diagram of a motor control circuit according to an embodiment of the present application;

FIG. 8 is a further circuit diagram of a motor control circuit provided in one embodiment of the present application;

FIG. 9 is a further circuit diagram of a motor control circuit according to an embodiment of the present application;

FIG. 10 is a further circuit diagram of a motor control circuit provided in one embodiment of the present application;

FIG. 11 is a current path diagram of a motor control circuit according to an embodiment of the present application;

FIG. 12 is another current path diagram of a motor control circuit according to an embodiment of the present application;

FIG. 13 is another current path diagram of a motor control circuit according to an embodiment of the present application;

FIG. 14 is another current path diagram of a motor control circuit according to an embodiment of the present application;

FIG. 15 is another current path diagram of a motor control circuit according to an embodiment of the present application;

FIG. 16 is another current path diagram of a motor control circuit according to an embodiment of the present application;

FIG. 17 is a schematic illustration of a vehicle according to another embodiment of the present application;

fig. 18 is a schematic internal structural diagram of a three-phase alternating-current motor in a vehicle according to another embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In order to explain the technical means of the present application, the following description will be given by way of specific examples.

The embodiment of the application provides a motor control circuit, as shown in fig. 1, the motor control circuit includes a three-phase inverter 102, a three-phase ac motor 103, an LC resonance module 110, and a control module 107, a three-phase coil of the three-phase ac motor 103 is connected to a three-phase arm of the three-phase inverter 102, a connection point of the three-phase coil of the three-phase ac motor 103 is connected to the LC resonance module 110, the LC resonance module 110 is connected to the three-phase inverter 102 and a power supply module 104, the power supply module 104 is further connected to the three-phase inverter 102, and the control module 107 is respectively connected to the three-phase inverter 102, the three-.

The LC resonant module 110 includes an inductor and a capacitor, and the number of the capacitors may be plural, and the capacitors may be connected in series with the inductor, so that LC oscillation may be achieved by connecting the inductor and the capacitor in series, for example, the voltage of the capacitor gradually increases and the current gradually decreases over a period of time; at the same time, the current of the inductor is gradually increased, the voltage of the inductor is gradually reduced, the voltage of the capacitor is gradually reduced in another period of time, the current is gradually increased, the current of the inductor is gradually reduced, and the voltage of the inductor is gradually increased; the three-phase inverter 102 comprises six power switch units, the power switches can be of transistor, IGBT, MOS tube and other device types, two power switch units form a phase bridge arm, the two phase bridge arms form a three-phase bridge arm, the connection point of two power switch units in each phase bridge arm is connected with a phase coil in the three-phase alternating current motor 103, the three-phase alternating current motor 103 comprises a three-phase coil, the three-phase coil is connected with a midpoint, the three-phase alternating current motor 103 can be a permanent magnet synchronous motor or an asynchronous motor, the three-phase alternating current motor 103 is of a three-phase four-wire system, namely, a neutral line is led out from the connection midpoint of the three-phase coil, and is connected with the LC resonance module 110, so that the three-phase inverter 102, the three-phase alternating current motor 103 and the LC resonance module 110 form an LC oscillation circuit, the power supply module 104 is used for, the energy storage device is charged by a power battery to output electric energy, for example, the energy storage device is a bus capacitor, the power supply module 104 CAN input initial energy and supplement energy to the LC resonance module 110, the control module 107 CAN collect voltage, current, temperature of the power supply module and phase current of the three-phase ac motor 103, the control module 107 CAN include a vehicle controller, a control circuit of a motor controller and a BMS battery manager circuit, which are connected by a CAN line, different modules in the control module 107 control the on and off of a power switch in the three-phase inverter 102 according to the obtained information to realize the on and off of different current loops, the control module 107 is connected with the part to be heated, and when the temperature of the part to be heated is lower than the preset temperature, the LC resonance module 110 is controlled to oscillate to enable an inductor and a capacitor in the LC resonance module 110 to generate heat, furthermore, the to-be-heated component is heated, and the to-be-heated component may be heated in various manners, for example, the to-be-heated component may be located near the LC resonance module 110, and may be directly heated, or may be heated by the heat exchange medium in the heat exchange medium pipeline through the LC resonance module 110, and then the heat exchange ring may flow through the to-be-heated component, so as to heat the to-be-heated component, in addition, when the control module 107 controls the LC resonance module 110 to operate, the current in the LC resonance module 110 may also flow through the three-phase ac motor 103 and the three-phase inverter 102, so that the three-phase ac motor 103 and the three-phase inverter 102 are in an operating state to generate heat.

The embodiment of the application sets up LC resonance module in motor control circuit, make LC resonance module and three-phase coil of three-phase alternating current motor's mid point be connected, because three-phase alternating current motor and three-phase inverter are connected, and then make LC resonance module, three-phase alternating current motor and three-phase inverter form resonant circuit, when acquireing and treat the heating block and need heat, control LC resonance module work and make the electric current flow through resonant circuit, and then make LC resonance module, three-phase inverter and three-phase alternating current motor are in operating condition in order to produce the heat, it heats to treat the heating block to utilize this heat, need not use the engine or increase complicated circuit structure to motor control circuit and just can realize promoting the temperature of treating the heating block, and heating efficiency is high, make and treat that the heating block temperature risees soon.

As for the LC resonance module, as shown in fig. 2, as an embodiment, the LC resonance module includes a capacitor module and an inductor module, the capacitor module is connected to the inductor module, the inductor module is further connected to a connection point of a three-phase coil of the three-phase ac motor, and the capacitor module is further connected to the three-phase inverter and the power supply module.

The capacitance module in the LC resonance module comprises one or more capacitors, the inductance module comprises one or more inductors, and the inductors and the capacitors form a series loop.

Further, as shown in fig. 2, the motor control circuit further includes a first switch module, and the first switch module is connected in series with the inductor module and then connected between a connection point of a three-phase coil of the three-phase ac motor and the capacitor module.

The first switch module is arranged to connect or disconnect the resonance module with the three-phase alternating current motor, so that the resonance module, the three-phase alternating current motor and the three-phase inverter form a resonance loop to be controlled.

For the power supply module, as an implementation manner, the power supply module includes a power battery, a third switch, a fourth switch and a capacitor, a positive electrode of the power battery is connected to a first end of the third switch, a second end of the third switch and a first end of the capacitor are connected together to be a positive electrode end of the power supply module, a negative electrode of the power battery is connected to a first end of the fourth switch, and a first end of the fourth switch and a second end of the capacitor are connected together to be a negative electrode end of the power supply module.

The power battery can be used as a part to be heated, when the electric energy of the power battery is sufficient, the power battery can provide the electric energy, the power battery and the capacitor are connected in parallel through the third switch and the fourth switch, when the third switch and the fourth switch are closed, the power battery charges the capacitor, when the third switch and the fourth switch are disconnected, the capacitor can discharge outwards, and even if the power battery is disconnected, the motor control circuit can be powered through the capacitor.

As for the power supply module, as shown in fig. 3, as another embodiment, the power supply module 104 includes an external power supply module 108 and a second switch module 109, where the second switch module 109 includes a first switch and a second switch, a positive pole of the external power supply module 108 is connected to a first end of the first switch, a second end of the first switch is a positive pole end of the power supply module 104, a negative pole of the external power supply module 108 is connected to a first end of the second switch, and a second end of the second switch is a negative pole end of the power supply module 104.

When the power battery is insufficient in electric energy, the external power module can be connected to supply electric energy to the motor control circuit.

Further, as an implementation manner of the external power module, the external power module is a dc charging pile.

As another embodiment of the external power supply module, the external power supply module includes an ac power supply, a filter, and a rectifier connected in sequence, and the rectifier is connected to the first end of the first switch and the second end of the first switch.

For the three-phase inverter 102, the three-phase inverter 102 includes a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch unit and a sixth power switch unit, a control end of each power switch unit is connected to the control module 107, input ends of the first power switch unit, the third power switch unit and the fifth power switch unit are connected to one end of the power supply module 104 in common, output ends of the second power switch unit, the fourth power switch unit and the sixth power switch unit are connected to the other end of the power supply module 104 in common, a first phase coil of the three-phase ac motor 103 is connected to an output end of the first power switch unit and an input end of the fourth power switch unit, a second phase coil of the three-phase ac motor 103 is connected to an output end of the third power switch unit and an input end of the sixth power switch unit, a third-phase coil of the three-phase ac motor 103 is connected to the output terminal of the fifth power switching unit and the input terminal of the second power switching unit.

The first power switch unit and the second power switch unit in the three-phase inverter 102 form an a-phase bridge arm, the third power switch unit and the fourth power switch unit form a B-phase bridge arm, the input end of the fifth power switch unit and the sixth power switch unit form a C-phase bridge arm, and the control mode of the three-phase inverter 102 may be any one of the following or a combination of several of the following modes: if any one or any two of A, B, C three-phase bridge arms and three bridge arms can be realized, 7 control heating modes are realized, and the method is flexible and simple. The switching of the bridge arms can be beneficial to realizing the large, medium and small selection of heating power, for example, for small-power heating, any phase of bridge arm power switches can be selected for control, and three-phase bridge arms can be switched in turn, for example, an A-phase bridge arm works alone first, a first power switch unit and a second power switch unit are controlled to heat for a period of time, then a B-phase bridge arm works alone, a third power switch unit and a fourth power switch unit are controlled to heat for the same period of time, then a C-phase bridge arm works alone, a fifth power switch unit and a sixth power switch unit are controlled to heat for the same period of time, and then the A-phase bridge arm works, so that the three-phase inverter 102 and a three-phase coil are circulated to be electrified and heated in turn, and three-phase heating is; for medium-power heating, any two-phase bridge arm power switches can be selected for control, and three-phase bridge arms can be switched in turn, for example, an AB-phase bridge arm works first, a first power switch unit, a second power switch unit, a third power switch unit and a fourth power switch unit are controlled to heat for a period of time, then a BC-phase bridge arm works, a third power switch unit, a fourth power switch unit, a fifth power switch unit and a sixth power switch unit are controlled to heat for the same time, then a CA-phase bridge arm works, a fifth power switch unit, a sixth power switch unit, a first power switch unit and a second power switch unit are controlled to heat for the same time, and then the CA-phase bridge arm works, and the steps are repeated to realize that the three-phase inverter 102 and a three-phase coil heat more evenly; for high-power heating, a three-phase bridge arm power switch can be selected for control, three-phase currents are balanced due to the fact that a three-phase loop is balanced theoretically, the three-phase currents are basically direct currents and are balanced by the three-phase inverter 102 and a three-phase coil, average values of the three-phase currents are basically consistent, three-phase synthetic magnetomotive force in the motor is basically zero due to the fact that three-phase windings are symmetrical, a stator magnetic field is basically zero, the motor basically does not generate torque, and stress of a transmission system is greatly reduced.

It should be noted that, in an actual circuit, the three-phase ac motor 103 and the three-phase circuit of the motor controller are not necessarily identical, so that the three-phase currents are not necessarily equal in the open-loop control, and the current difference may become larger and larger over a long period of time, so that the three-phase current independent closed-loop control is required to control the average value of the three-phase currents to the preset precision range of the equilibrium value.

Further, when the capacitor module 101 includes two capacitors, as a circuit connection manner, a first end of the capacitor module 101 is connected to a first end of the three-phase inverter 102 and a positive end of the power supply module 104, a second end of the capacitor module 101 is connected to a second end of the three-phase inverter 102 and a negative end of the power supply module 104, a third end of the capacitor module 101 is connected to a first end of the inductor module 105, a second end of the inductor module 105 is connected to a first end of the first switch module 106, a second end of the first switch module 106 is connected to a connection point of three-phase coils of the three-phase ac motor 103, and the three-phase coils of the three-phase ac motor 103 are respectively connected to three-phase ends of the three-phase inverter 102.

Fig. 4 is a circuit diagram illustrating an example of the motor control circuit of the present embodiment, wherein the capacitor module 101 includes a first capacitor C1 and a second capacitor C2, a first end of the first capacitor C1 is a first end of the capacitor module 101, a second end of the first capacitor C1 and a first end of the second capacitor C2 are connected to a third end of the capacitor module 101, and a second end of the second capacitor C2 is a second end of the capacitor module 101; the inductance module 105 comprises an inductance L, the inductance L is connected between a first capacitor C1 and a second capacitor C2, the first switch module 106 comprises a switch K, the power supply module 104 comprises a dc bus capacitor C, the first power switch unit in the three-phase inverter 102 comprises a first upper bridge arm VT1 and a first upper bridge diode VD1, the second power switch unit comprises a second lower bridge arm VT2 and a second lower bridge diode VD2, the third power switch unit comprises a third upper bridge arm VT3 and a third upper bridge diode VD3, the fourth power switch unit comprises a fourth lower bridge arm VT4 and a fourth lower bridge diode VD4, the fifth power switch unit comprises a fifth upper bridge arm VT5 and a fifth upper bridge diode VD2, the sixth power switch unit comprises a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, the three-phase ac motor 103 is of a three-phase four-wire system, which can be a permanent magnet synchronous motor or an asynchronous motor, a neutral line is connected with a three-phase coil, and the neutral line is connected with a switch K2, and the three-phase coil of the motor is respectively connected with the upper and lower bridge arms A, B, C in the three-phase inverter 102.

Fig. 5 is a circuit diagram of another example of the motor control circuit according to the embodiment, in which, on the basis of fig. 4, the external power supply module is a charging pile 108 for outputting direct current, and two ends of the three-phase inverter 102 are connected in parallel to a power battery 110 through a third switch K3 and a fourth switch K4.

Fig. 6 is a circuit diagram of another example of the motor control circuit according to the embodiment, in which the external power module includes an ac power source 113, a filter 112, and a rectifier 111, which are connected in sequence, the rectifier 111 is connected to a first end of a first switch K1 and a first end of a second switch K2, and two ends of the three-phase inverter 102 are connected in parallel to the power battery 110 through a third switch K3 and a fourth switch K4.

As another circuit connection mode, when the capacitor module includes one capacitor, the capacitor module is a first capacitor, a first end of the first capacitor is connected to a first end of the three-phase inverter and a positive end of the power supply module, a second end of the first capacitor is connected to a first end of the inductor module, a second end of the inductor module is connected to a first end of the first switch module, a second end of the first switch module is connected to a connection point of three-phase coils of the three-phase ac motor, and the three-phase coils of the three-phase ac motor are respectively connected to three-phase ends of the three-phase inverter.

Fig. 7 is a circuit diagram illustrating an example of the motor control circuit according to the present embodiment, wherein the capacitor module 101 includes a first capacitor C1.

As another circuit connection mode, when the capacitor module includes one capacitor, the capacitor module is a second capacitor, the first end of the first capacitor is connected to the second end of the three-phase inverter and the negative end of the power supply module, the second end of the first capacitor is connected to the first end of the inductor module, the second end of the inductor module is connected to the first end of the first switch module, the second end of the first switch module is connected to a connection point of three-phase coils of the three-phase ac motor, the three-phase coils of the three-phase ac motor are respectively connected to the three-phase ends of the three-phase inverter, and the first end of the three-phase inverter is connected to the positive end of the power supply module.

Fig. 8 is a circuit diagram illustrating an example of the motor control circuit according to the present embodiment, wherein the capacitor module 101 includes a first capacitor C2.

Fig. 9 is a circuit diagram of another example of the motor control circuit according to the embodiment, in which, on the basis of fig. 7, the external power supply module is a charging pile 108 for outputting direct current, and two ends of the three-phase inverter 102 are connected in parallel to a power battery 110 through a third switch K3 and a fourth switch K4.

Fig. 10 is a circuit diagram of another example of the motor control circuit according to the embodiment, in which the external power module includes an ac power source 113, a filter 112, and a rectifier 111, which are connected in sequence, the rectifier 111 is connected to a first terminal of a first switch K1 and a first terminal of a second switch K2, and two terminals of the three-phase inverter 102 are connected in parallel to the power battery 110 through a third switch K3 and a fourth switch K4.

In another embodiment of the present application, a heating method for a vehicle is provided, where based on the motor control circuit provided in each of the above embodiments, the heating method includes:

when the part to be heated needs to be heated, the control module controls the on-off states of different power switch units in the three-phase inverter to enable energy to flow among the power supply module, the LC resonance module and the three-phase coil of the three-phase alternating current motor, so that the heat exchange medium flowing through at least one heat exchange medium pipeline in the LC resonance module, the three-phase inverter and the three-phase alternating current motor is heated.

The heating device comprises a heating part, a control module, a liquid crystal display panel and a liquid crystal display panel, wherein the heating part is connected with the control module, the control module judges that the heating part needs to be heated when detecting that the temperature of the heating part is lower than a preset value, the control module also judges whether the heating part needs to be heated according to a received control instruction, the heating part can be various electronic devices or power electric batteries on a vehicle, the liquid crystal display panel heats a heat exchange medium flowing through at least one heat exchange medium pipeline in an LC resonance module, a three-phase inverter and a three-phase alternating current motor, and the heating part is heated when the heat exchange medium flows through.

When the component to be heated is a power battery, due to the inherent characteristics of the power battery, the charging and discharging capacity of the power battery is greatly reduced in a low-temperature state, and the use of a new energy automobile in a cold region is affected, and in order to enable the power battery to work normally, the temperature of the power battery needs to be raised when the temperature of the power battery is too low, so that the temperature of the power battery is obtained through the control module, for example, a battery manager can be used for obtaining the temperature of the power battery, the temperature of the power battery is compared with a preset temperature value to judge whether the power battery is in the low-temperature state, when the obtained temperature of the power battery is lower than the preset temperature value, the temperature of the power battery can be raised in a manner of raising the temperature of a heat exchange medium flowing through the power battery, and when the control module controls the LC resonance module to work, the current in the LC resonance module can also flow through, the three-phase alternating current motor and the three-phase inverter are enabled to be in a working state to generate heat, and then the power battery is heated.

In a specific embodiment, the component to be heated and the power supply module are the same component, such as a power battery. Like this, not only at the in-process that forms the circuit loop, power battery can make self temperature rise because of the internal resistance, and, can also be through the produced heat transfer of the motor control circuit in this application for power battery, promptly: the device can be used for a power battery to supply power to a three-phase alternating current motor so as to drive wheels to rotate, and can also be used for providing a heat source for the power battery needing to be heated.

The embodiment of the application sets up LC resonance module in motor control circuit, make LC resonance module and three-phase coil of three-phase alternating current motor's mid point be connected, because three-phase alternating current motor and three-phase inverter are connected, and then make LC resonance module, three-phase alternating current motor and three-phase inverter form resonant circuit, when acquireing and treat the heating block and need heat, control LC resonance module work and make the electric current flow through resonant circuit, and then make LC resonance module, three-phase inverter and three-phase alternating current motor are in operating condition in order to produce the heat, it heats to treat the heating block to utilize this heat, need not use the engine or increase complicated circuit structure to motor control circuit and just can realize promoting power battery's temperature, and heating efficiency is high, it is fast to make and treat the heating block temperature rising.

Further, the LC resonance module comprises an inductance module and a capacitance module;

in the above step, controlling the on-off states of different power switch units in the three-phase inverter to enable energy to flow among the power supply module, the LC resonance module, and the three-phase coil of the three-phase ac motor, so as to heat the heat transfer medium flowing through at least one heat transfer medium pipeline in the LC resonance module, the three-phase inverter, and the three-phase ac motor, includes:

and controlling the first switch module to be in a conducting state, and enabling energy to flow among the power supply module, the capacitor module, the inductor module and a three-phase coil of the three-phase alternating current motor by controlling the on-off states of different power switch units in the three-phase inverter so as to heat the heat exchange medium flowing through at least one heat exchange medium pipeline in the capacitor module, the inductor module, the three-phase inverter and the three-phase alternating current motor.

As shown in fig. 2, since the inductance module 105, the three-phase inverter 102 and the three-phase ac motor 103 all generate heat in the operating state, the inductance module 105, the three-phase inverter 102 and the three-phase ac motor 103 can be controlled to heat the heat transfer medium flowing through the power battery, the heat transfer medium can be heated by the heat generated in the charging and discharging processes among the power supply module 104, the capacitance module 101, the inductance module 105 and the three-phase coil of the three-phase ac motor 103, since the capacitance module 101, the inductance module 105 and the three-phase coil of the three-phase ac motor 103 can store electric energy, and the capacitance module 101, the inductance module 105 and the three-phase coil of the three-phase ac motor 103 can form a resonant circuit, and energy can flow among the power supply module 104, the capacitance module 101, the inductance module 105 and the three-phase coil of the three-phase ac motor 103 by oscillation of the resonant circuit, further, the inductance module 105, the three-phase inverter 102 and the three-phase alternating current motor 103 heat the heat exchange medium flowing through the power battery; the neutral line is drawn out in three-phase AC motor in this application embodiment, and then with power module, the electric capacity module, inductance module and three-phase inverter constitute different return circuits, make different return circuits switch on through controlling three-phase inverter, make the energy flow between the device in different return circuits, and then make three-phase AC motor inside three-phase coil, three-phase inverter and boost module and inside device that generates heat provide the heat source, realize the heating to power battery through former cooling circuit behind the heating heat transfer medium, need not use the engine or increase heating device and just can realize promoting power battery's temperature, and heating efficiency is high, power battery temperature risees soon.

As a first embodiment, as shown in fig. 2, the capacitance module 101, the three-phase inverter 102, the three-phase coil of the three-phase ac motor 103, the first switching module 106, and the inductance module 105 form an LC resonance circuit, and the capacitance module 101, the three-phase coil of the three-phase ac motor 103, and the inductance module 105 form an LC resonance unit.

In the above step, controlling the on-off states of different power switch units in the three-phase inverter to enable energy to flow among the power supply module, the capacitor module, the inductor module and the three-phase coil of the three-phase ac motor includes:

the control module controls the on-off states of different power switch units in the three-phase inverter to enable the power supply module 104 to alternately charge the LC resonance unit and oscillate the LC resonance circuit, so that energy flows among the power supply module, the capacitor module, the inductor module and a three-phase coil of the three-phase alternating current motor.

Wherein, the capacitor module 101 may be used as a capacitor part in the LC resonant unit, the three-phase coil of the three-phase ac motor 103 and the inductor module 105 may be used as an inductor part in the LC resonant unit, the control module 107 controls the first switch module 106 and the three-phase inverter 102 to oscillate the LC resonant circuit, before the LC resonant circuit oscillates, energy needs to be output to the LC resonant unit for oscillation starting control, and energy is output to the LC resonant unit for energy supplement after the LC resonant circuit oscillates, wherein, the time for controlling the conduction of the power switch unit in the three-phase inverter 102 by the control module 107 determines the magnitude of the single supplement energy, the conduction period of the power switch unit depends on the switching frequency, when the switching frequency approaches the resonant frequency of the circuit LC, the larger the current flows through the three-phase coil of the three-phase ac motor 103, the inductor module 105 and the capacitor module 101 in the resonant circuit, as the heating power increases, in the present embodiment, by providing the capacitance module and the inductance module and forming the capacitance module, the inductance module, and the three-phase coil of the three-phase ac motor into the LC resonance unit, the energy flow is realized in the state where the power supply module charges the LC resonance unit and in the state where the LC resonance unit oscillates, and further, the inductance module 105, the three-phase inverter 102, and the three-phase ac motor 103 heat the heat transfer medium flowing through the power battery.

Further, in the above step, controlling the on/off states of different power switch units in the three-phase inverter to make the power supply module charge the LC resonant unit and make the LC resonant tank oscillate alternately includes:

the control module enables the power supply module to charge the LC resonance unit by controlling the three-phase inverter, then enables the LC resonance circuit to be in an oscillation state, and enables the power supply module to charge the LC resonance unit again when the oscillation current of the LC resonance circuit is lower than the preset current, so that the power supply module charges the LC resonance unit and the LC resonance circuit oscillates alternately.

Wherein, when the LC tank is in oscillation state, the time for charging the LC tank oscillation depends on the energy stored in the LC tank, when the energy in the LC tank is sufficient, can oscillate for many times, and each oscillation consumes certain energy, therefore, after the oscillation is completed for many times, the LC resonance unit in the LC resonance circuit needs to be charged through the power supply module, to supplement the energy in the resonance circuit, and then to perform the oscillation of the LC resonance circuit after the completion of the energy supplement, the number of oscillations may be predetermined in accordance with the energy input to the LC resonant cell, the number of oscillations of the LC tank being preset in this embodiment, after the LC resonance circuit oscillates, the power supply module is controlled to supplement energy to the LC resonance unit in time, so that the LC resonance circuit restarts to oscillate, the precise control of the LC resonance circuit is realized, and the continuity of heating the heat exchange medium flowing through the power battery is ensured.

Preferably, the control module causing the LC tank to oscillate comprises:

the LC resonant circuit sequentially passes through the capacitor module 101 to discharge the three-phase coil and the inductor module 105 of the three-phase ac motor 103 along the first current direction, the three-phase coil and the inductor module 105 of the three-phase ac motor 103 to charge the capacitor module 101 along the second current direction, the capacitor module 101 to discharge the three-phase coil and the inductor module 105 of the three-phase ac motor 103 along the second current direction, and the three-phase coil and the inductor module 105 of the three-phase ac motor 103 to charge the capacitor module 101 along the first current direction.

The first oscillation in the LC resonance circuit is charged and discharged in sequence along the first current direction and the second current direction, the second oscillation in the LC resonance circuit is charged and discharged in sequence along the second current direction and the first current direction, and the LC resonance circuit completes two preset oscillations by setting different current flow directions in the oscillation process, so that the energy in the LC resonance circuit flows between the capacitance module and the three-phase coil and the inductance module of the three-phase alternating current motor, and the energy is exchanged twice through different paths.

Further, when the obtained LC resonant tank oscillating current is lower than the preset current threshold, the method for charging the LC resonant unit by the power supply module includes:

when the obtained LC resonant circuit oscillating current is lower than the preset current, when the state in which the three-phase coil of the three-phase ac motor 103 and the inductance module 105 charge the capacitance module 101 in the second current direction ends or the state in which the three-phase coil of the three-phase ac motor 103 and the inductance module 105 charge the capacitance module 101 in the first current direction ends, the power supply module 104 is charged to the LC resonant unit again.

when the obtained LC resonance circuit oscillation current is lower than the preset current, and when the current of the obtained inductance module along the first current direction or along the second current direction is gradually reduced to 0, the power supply module is enabled to charge the LC resonance unit again.

Further, the charging the LC resonance unit by the power supply module includes:

acquiring the resonant frequency of the LC resonant unit;

and adjusting the switching frequency and the switching duty ratio of a power switching unit in the three-phase inverter according to the resonant frequency of the LC resonant unit so as to adjust the oscillating current of the LC resonant circuit.

The switching frequency of the three-phase bridge arm power device is controlled to adjust the magnitude of the heating current, the switching frequency is close to the inherent resonant frequency of the circuit LC, and the heating power is increased when the current flowing through the motor inductor, the inductor L and the first capacitor C1 (or the second capacitor C2 or the first capacitor C1+ C2) in the resonant circuit is increased.

As a second embodiment, the capacitance module 101, the three-phase inverter 102, the three-phase coil of the three-phase ac motor 103, the first switching module 106, and the inductance module 105 form an LC resonance circuit, and the capacitance module 101, the three-phase coil of the three-phase ac motor 103, and the inductance module 105 form an LC resonance unit; the control module 107 controls the three-phase inverter 102 to charge the LC resonance unit with the power supply module 104, and then to set the LC resonance circuit in an oscillation state, and when the LC resonance circuit completes oscillation, the LC resonance unit discharges to the power supply module 104, so that energy flows among the power supply module 104, the capacitor module 101, the inductor module 105, and the three-phase coil of the three-phase ac motor 103.

The difference between this embodiment and the first embodiment is that after the LC resonant tank oscillates for a preset number of times, the LC resonant unit discharges to the power supply module 104, that is, the remaining energy after the LC resonant tank completes oscillation is retransmitted to the power supply module 104.

Preferably, the control module 107 causing the LC tank to oscillate comprises:

a state in which the LC resonant circuit discharges the three-phase coil of the three-phase ac motor 103 and the inductance module 105 in the first current direction through the capacitance module 101, and a state in which the three-phase coil of the three-phase ac motor 103 and the inductance module 105 charge the capacitance module 101 in the second current direction.

Energy in the LC resonant circuit flows between the capacitor module 101 and the three-phase coil and the inductor module 105 of the three-phase ac motor 103 by discharging the capacitor module 101 and charging the three-phase coil and the inductor module 105 of the three-phase ac motor 103.

As a third embodiment, as shown in fig. 3, the boost module is further connected to an external power supply module 108 and a second switch module 109, the external power supply module 108 is connected in series with the second switch module 109 and then connected in parallel with the capacitor module 101, the three-phase inverter 102, the three-phase coil of the three-phase ac motor 103, the first switch module 106 and the inductor module 105 form an LC resonant circuit, and the capacitor module 101, the three-phase coil of the three-phase ac motor 103 and the inductor module 105 form an LC resonant unit; when the control module 107 obtains that the temperature of the power battery is lower than the preset temperature value and obtains that the power battery is connected with the external power supply module 108, the control module 107 controls the first switch module 106, the second switch module 109 and the three-phase inverter 102 to enable the external power supply module 108 to charge the LC resonance unit and to alternately perform the oscillation process of the LC resonance circuit, so that energy flows among the power supply module 104, the capacitor module 101, the inductor module 105 and the three-phase coil of the three-phase alternating current motor 103.

Wherein, the external power supply module 104 may be a direct current provided by the dc charging pile, or a direct current output by a single-phase or three-phase ac charging pile after rectification, or an electric energy generated by a fuel cell, or a range extender such as an engine rotating to drive a generator to generate electricity, or a power supply form such as a direct current rectified by a generator controller, the control module 107 controls the second switch module 109 to be turned on, so that the external power supply module 104 outputs a current to the capacitor module 101, the capacitor module 101 is used as a capacitor part in an LC resonance unit, a three-phase coil of the three-phase ac motor 103 and the inductor module 105 are used as an inductor part in the LC resonance unit, the control module 107 controls the first switch module 106 and the three-phase inverter 102 to oscillate the LC resonance circuit, before the LC resonance circuit oscillates, energy needs to be output to the LC resonance unit for oscillation starting control, when power module 104 can not output electric energy to capacitor module 101, at this moment, output electric energy to capacitor module 101 through external power module 108, when LC resonant circuit finishes oscillating, rethread external power module 108 carries out energy supplementation to LC resonance unit output energy, in this embodiment, when obtaining that the temperature of power battery is less than preset temperature value and when detecting to connect external power module, output electric energy to LC resonance unit through external power module, realized the flow of energy in the state that external power module charges LC resonance unit and the state that LC resonance unit carries out the oscillation, realized that inductance module, three-phase inverter and three-phase alternating current motor heat the heat transfer medium that flows through power battery.

Further, the control module 107 controls the second switch module 109 to charge the LC resonant unit with the external power module 108, controls the first switch module 106 and the three-phase inverter 102 to oscillate the LC resonant circuit, and recharges the LC resonant unit with the external power module 108 after the LC resonant circuit oscillates, so that the LC resonant unit is alternately charged with the external power module 108 and oscillated by the LC resonant circuit.

Wherein, before the LC resonance circuit oscillates, the external power module 108 is required to output electric energy to the LC resonance unit, the time to charge the LC tank into oscillation when the LC tank is in oscillation depends on the amount of energy stored in the LC tank, and when the energy in the LC tank is sufficient, can oscillate for many times, each oscillation consumes certain energy, therefore, after the oscillation is completed for many times, the LC resonant unit in the LC resonant circuit needs to be charged through the external power module 108, the energy in the resonance circuit is supplemented, and the LC resonance circuit oscillates after the energy supplement is finished.

Preferably, the control module 107 causing the LC tank to oscillate comprises:

Further, as an embodiment, before controlling the inductance module 105, the three-phase inverter 102, and the three-phase ac motor 103 to heat the heat transfer medium flowing through the power battery, the control module 107 needs to determine whether the received information meets a preset condition, where the preset condition may include, in addition to the determination of the temperature value of the power battery, other determination conditions:

the control module 107 obtains a state signal of the three-phase ac motor (e.g., which may be determined from the gear information and the vehicle speed signal), and temperature information of the power battery.

When the control module 107 determines that the state signal of the three-phase alternating current motor is in a non-driving state (for example, it can be determined by whether the gear is in the P gear and the vehicle speed is zero), it determines whether the temperature of the power battery is lower than a preset temperature value.

When the control module 107 determines that the temperature of the power battery is lower than a preset temperature value, it is determined whether the electric vehicle is connected to the external power module 108, and when it is determined that the external power module 108 is connected, the external power module 108 charges the LC resonance unit and the LC resonance circuit oscillates by controlling the first switch module 106, the second switch module 109, and the three-phase inverter 102, so that energy flows among the power supply module 104, the capacitor module 101, the inductor module 105, and the three-phase coil of the three-phase ac motor 103, and the inductor module 105, the three-phase inverter 102, and the three-phase ac motor 103 heat a heat transfer medium flowing through the power battery.

When the control module 107 determines that the external power module 108 is not connected, it determines whether the remaining power of the power battery is allowed to be used for heating the power battery, and when it determines that the remaining power of the power battery is allowed to be used for heating the power battery, it controls the first switching module 106 to be in a conducting state, and controls the three-phase inverter 102 to enable energy to flow among the power supply module 104, the capacitor module 101, the inductor module 105 and the three-phase coil of the three-phase ac motor 103, so that the inductor module 105, the three-phase inverter 102 and the three-phase ac motor 103 heat the heat exchange medium flowing through the power battery.

When the control module 107 obtains that the power battery residual capacity is not allowed to be used for heating the battery, the motor heating program is exited.

In the embodiment, when gear information is acquired in a parking state, vehicle speed information and temperature information of the power battery meet preset conditions, whether the external power module is connected or not is detected, when the external power module is connected, the external power module is controlled to output current to the capacitor module, when the external power module is not connected, the power supply module is controlled to output current to the capacitor module, a heat exchange medium flowing through the power battery is heated through the inductor module, the three-phase inverter and the three-phase alternating current motor, the power battery is heated in the parking state of the electric vehicle, and the electric vehicle can be normally started in a low-temperature condition.

The above embodiments are explained below by specific circuit configurations:

fig. 4 is a circuit diagram illustrating an example of a motor control circuit according to the present application, in which a first embodiment is to use a motor inductor, an inductor L, and a second capacitor C2 to implement an LC resonant circuit, when a current flows in the motor, the motor generates heat to heat a heat transfer medium of a circulation system, and when the temperature of the heat transfer medium reaches a certain temperature, the heat transfer medium enters a battery heat dissipation loop to heat a battery. The heating power is efficiently adjusted by adjusting the frequency of the alternating current flowing in the LC, the frequency of the current flowing in the motor is close to the resonance frequency of the LC, the heating power is larger, and otherwise, the heating power is reduced. In a specific implementation, when the power battery needs to be heated, in order to realize the heating of the power battery, the control phase of the first embodiment specifically includes:

control phase 1 of the first embodiment: as shown in fig. 11, the control stage 1 is used for the resonance control of the resonant circuit and the function of supplementing energy in the resonant circuit during the resonant operation, the control module 107 controls the upper bridge power switch of the three-phase inverter 102 to be turned on and controls the lower bridge power switch to be turned off, the dc bus capacitor C, the upper bridge power switch (the first upper bridge arm VT1, the third upper bridge arm VT3, and the fifth upper bridge arm VT5), the three-phase ac motor 103, the switch K, the inductor L, and the second capacitor C2 form a charging circuit, the dc bus capacitor C charges the second capacitor C2, and the three-phase coil and the inductor L of the motor store energy at the same time.

Control phase 2 of the first embodiment: as shown in fig. 12, in a stage where the three-phase coil and the inductor L of the motor discharge the second capacitor C2, the control module 107 controls the upper bridge power switch of the three-phase inverter 102 to be turned off and controls the lower bridge power switch to be turned on, the three-phase ac motor 103, the switch K, the inductor L, the second capacitor C2, and the lower bridge power switch (the second lower bridge diode VD2, the fourth lower bridge diode VD4, and the sixth lower bridge diode VD6) form a discharge loop, the three-phase coil and the inductor L of the motor charge the second capacitor C2, when the current in the three-phase coil and the inductor L of the motor is zero, the stage is ended, and at this time, the energy in the three-phase coil and the inductor L of the motor is completely transferred to the second capacitor C2.

Control phase 3 of the first embodiment: as shown in fig. 13, in the energy storage stage in which the second capacitor C2 discharges to the three-phase coil and the inductance L of the motor, the control module 107 controls the upper bridge power switch to be turned off and controls the lower bridge power switch to be turned on, the second capacitor C2, the inductance L, the switch K, the three-phase ac motor 103, and the lower bridge power switch (the second lower bridge arm VT2, the fourth lower bridge arm VT4, and the sixth lower bridge arm VT6) form a discharge circuit, and when the voltage of the second capacitor C2 is zero, the stage is ended, and at this time, all energy in the second capacitor C2 is transferred to the three-phase coil and the inductance L of the motor.

Control phase 4 of the first embodiment: as shown in fig. 14, in a reverse charging stage in which the three-phase coil and the inductor L of the motor discharge to the second capacitor C2, the control module 107 controls the upper bridge power switch to be turned off and controls the lower bridge power switch to be turned on, the three-phase ac motor 103, the switch K, the inductor L, the second capacitor C2, and the lower bridge power switch (the second lower bridge arm VT2, the fourth lower bridge arm VT4, and the sixth lower bridge arm VT6) form a discharging loop, the three-phase coil and the inductor L of the motor charge the second capacitor C2 through the second lower bridge arm VT2, the fourth lower bridge arm VT4, and the sixth lower bridge arm VT6, and when the current in the three-phase coil and the inductor L of the motor is zero, the energy in the three-phase coil and the inductor L of the motor is completely transferred to the second capacitor C2.

Phase 5 of control strategy 1: as shown in fig. 15, in the energy storage stage of the second capacitor C2 discharging to the three-phase coil and the inductor L of the motor, the control module 107 controls the upper bridge power switch to be turned off and controls the lower bridge power switch to be turned on, the three-phase ac motor 103, the switch K, the inductor L, the second capacitor C2, and the lower bridge power switch (the second lower bridge diode VD2, the fourth lower bridge diode VD4, and the sixth lower bridge diode VD6) form a discharge loop, and when the voltage of the second capacitor C2 is zero, the energy in the second capacitor C2 is completely transferred to the three-phase coil and the inductor L of the motor at this stage.

Wherein, the control stage 1 in the first embodiment is the entering stage in the resonance process: the time for supplementing the energy in the resonant tank in the resonant operation process can enter the stage 1 to control to supplement the resonant energy when the control stage 2 or the control stage 4 is finished, so that the sequence of the control stage can be that the control stage 2, the control stage 1, the control stage 3, the control stage 4 and the control stage 5 are circulated in sequence or that the control stage 2, the control stage 3, the control stage 4, the control stage 1 and the control stage 5 are circulated in sequence.

The second kind of embodiment is for utilizing motor three-phase coil, inductance L, second electric capacity C2 to realize LC resonance circuit, when flowing current in the motor, the motor produced the heat, heating cycle system's heat transfer medium, when heat transfer medium's temperature heating reached the uniform temperature, let heat transfer medium get into power battery heat dissipation return circuit again and give power battery heating, and its control phase includes:

control phase 1 of the second embodiment: the same as the control phase 1 of the first embodiment.

Control phase 2 of the second embodiment: the same as the control phase 2 of the first embodiment.

Control phase 3 of the second embodiment: as in control stage 3 of the first embodiment.

Control phase 4 of the second embodiment: as shown in fig. 16, during the charging phase when the three-phase coil and the inductor L of the motor discharge to the dc bus capacitor C and the second capacitor C2, the control module 107 controls the upper bridge power switch to be turned on and controls the lower bridge power switch to be turned off, the dc bus capacitor C and the upper bridge power switch (the first upper bridge diode VD1, the third upper bridge diode VD3, the fifth upper bridge diode VD5), the three-phase ac motor 103, the switch K, the inductor L, and the second capacitor C2 form a charging loop, the three-phase coil and the inductor L of the motor discharge to the dc bus C and the second capacitor C2 through the first upper bridge diode VD1, the third upper bridge diode VD3, and the fifth upper bridge diode VD5, when the current in the three-phase coil and the inductor L of the motor is zero, at this time, the energy in the three-phase coil and the inductor L of the motor is completely transferred to the dc bus capacitor C, if the dc bus is taken by the power battery, the energy can be returned to the power battery, and the heat generation of the charging and discharging power battery of the battery is realized.

Another embodiment of the present application further provides an electric vehicle, including the motor control circuit in the foregoing embodiment.

As shown in fig. 17, the control module includes a vehicle control unit 301, a battery manager 302, a first motor controller 305, and a second motor controller 303, the vehicle control unit 301 is connected to the battery manager 302, the first motor controller 305, and the second motor controller 303 through a CAN bus, a dc charging post is electrically connected to a first three-phase ac motor 306 through a connection line 307, the dc charging post is electrically connected to a second three-phase ac motor 304 through a connection line 310, a power battery is electrically connected to the first motor controller 305 and the second motor controller 303, a cooling liquid tank 308, a water pump 309, the first three-phase ac motor 306, the first motor controller 305, the second three-phase ac motor 304, the second motor controller, and the power battery form a cooling liquid pipeline, the battery manager 302 is configured to collect power battery information including voltage, current, temperature, and the like, the motor controller is used for controlling power switches of an upper bridge and a lower bridge of the three-phase inverter and collecting three-phase current, and the vehicle controller is used for managing the operation of a whole vehicle and other controller equipment on the vehicle. The battery manager 302 and the motor controller are communicated with the vehicle control unit 301 through a CAN (controller area network) line, when the vehicle control unit 301 detects that the power battery needs to be heated, the water pump 309 is controlled to pump cooling liquid out of the cooling liquid tank 308, a cooling liquid water pipeline sequentially passes through the first three-phase alternating current motor 306, the first motor controller 305, the second three-phase alternating current motor 304 and the second motor controller 303 to flow through the power battery, the vehicle control unit 301 controls the first three-phase alternating current motor 306, the first motor controller 305, the second three-phase alternating current motor 304 and the second motor controller 303 to work so as to heat the cooling liquid, and then when the cooling liquid flows through the power battery, the temperature of the power battery 106 is increased.

Further, as shown in fig. 18, the three-phase ac motor 102 includes a motor shaft 125a, a stator assembly 127a, and a motor housing 123a, the motor shaft 125a is connected to the stator assembly 127a and the bearing seat 124a, the stator assembly 127a is disposed in the motor housing 123a, the motor housing 123a is provided with a heat exchange medium inlet 121 and a heat exchange medium outlet 126 for the heat exchange medium 122a to flow in and out, a heat exchange medium passage is disposed between the motor housing 123a and the stator assembly 127a, and the heat exchange medium passage is connected to the heat exchange medium inlet 121a and the heat exchange medium outlet 126 a.

The heat exchange medium channel may be provided between the motor housing 123a and the stator assembly 127a, and the heat exchange medium channel spirally surrounding the stator assembly 127a is provided in the motor housing 123 a.

According to the three-phase alternating current motor, the heat exchange medium channel is arranged between the motor shell 123a and the stator assembly 127a and is connected with the heat exchange medium inlet 121a and the heat exchange medium outlet 126a, so that heat generated by the motor can be effectively absorbed by heat exchange medium in the heat exchange medium channel, the channel does not need to be arranged inside the motor shaft 125a or the stator assembly 127a, the structural influence on the motor is small, the implementation mode is simple, and the cost is low.

The device comprises a power supply module, a three-phase inverter, a stator assembly, a battery cooling circuit, a stator assembly, a battery cooling circuit and a battery, wherein the three-phase inverter is controlled to enable the power supply module to alternately perform a charging process of a three-phase coil and a discharging process of the three-phase coil, so that the three-phase inverter and a three-phase alternating current motor heat a heat exchange medium flowing through at least one of the three-phase inverter and the three-phase alternating current motor through the electric driving cooling circuit, the heat exchange medium flows into a heat exchange medium inlet of the three-phase alternating current motor, the stator assembly heats the heat exchange medium in a heat exchange.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. The motor control circuit is characterized by comprising a three-phase inverter, a three-phase alternating current motor, an LC resonance module and a control module, wherein a three-phase coil of the three-phase alternating current motor is connected with a three-phase bridge arm of the three-phase inverter, a connection point of the three-phase coil of the three-phase alternating current motor is connected with the LC resonance module, the LC resonance module is connected with the three-phase inverter and a power supply module, the power supply module is further connected with the three-phase inverter, and the control module is respectively connected with the three-phase inverter, the three-phase alternating current motor and the power supply module.

2. The motor control circuit of claim 1 wherein said LC resonant module comprises a capacitive module and an inductive module, said capacitive module coupled to said inductive module, said inductive module further coupled to a junction of three-phase coils of said three-phase ac motor, said capacitive module further coupled to said three-phase inverter and to a power supply module.

3. The motor control circuit of claim 2 further comprising a first switching module connected in series with said inductance module between a junction of three-phase coils of said three-phase ac motor and said capacitance module.

4. The motor control circuit according to claim 3, wherein a first end of the capacitor module is connected to a first end of the three-phase inverter and a positive end of the power supply module, a second end of the capacitor module is connected to a second end of the three-phase inverter and a negative end of the power supply module, a third end of the capacitor module is connected to a first end of the inductor module, a second end of the inductor module is connected to a first end of the first switch module, a second end of the first switch module is connected to a connection point of three-phase coils of the three-phase ac motor, and the three-phase coils of the three-phase ac motor are respectively connected to the three-phase ends of the three-phase inverter.

5. The motor control circuit of claim 4 wherein said capacitor module includes a first capacitor and a second capacitor, a first terminal of said first capacitor being a first terminal of said capacitor module, a second terminal of said first capacitor being connected to a first terminal of said second capacitor as a third terminal of said capacitor module, and a second terminal of said second capacitor being a second terminal of said capacitor module.

6. The motor control circuit according to claim 3, wherein the capacitor module is a first capacitor, a first end of the first capacitor is connected to the first end of the three-phase inverter and the positive terminal of the power supply module, a second end of the first capacitor is connected to the first end of the inductor module, a second end of the inductor module is connected to the first end of the first switch module, a second end of the first switch module is connected to a connection point of three-phase coils of the three-phase ac motor, and the three-phase coils of the three-phase ac motor are respectively connected to the three-phase terminals of the three-phase inverter.

7. The motor control circuit according to claim 3, wherein the capacitor module is a second capacitor, a first end of the first capacitor is connected to the second end of the three-phase inverter and the negative end of the power supply module, a second end of the first capacitor is connected to the first end of the inductor module, a second end of the inductor module is connected to the first end of the first switch module, a second end of the first switch module is connected to a connection point of three-phase coils of the three-phase ac motor, the three-phase coils of the three-phase ac motor are respectively connected to the three-phase ends of the three-phase inverter, and the first end of the three-phase inverter is connected to the positive end of the power supply module.

8. The motor control circuit according to any one of claims 4 to 7, wherein the power supply module comprises a power battery, a third switch, a fourth switch and a capacitor, wherein the positive pole of the power battery is connected with the first end of the third switch, the second end of the third switch and the first end of the capacitor are connected together to form the positive pole end of the power supply module, the negative pole of the power battery is connected with the first end of the fourth switch, and the first end of the fourth switch and the second end of the capacitor are connected together to form the negative pole end of the power supply module.

9. The motor control circuit according to any one of claims 4 to 7, wherein the power supply module comprises an external power supply module, a first switch, and a second switch, wherein an anode of the external power supply module is connected to a first end of the first switch, a second end of the first switch is a positive end of the power supply module, a cathode of the external power supply module is connected to a first end of the second switch, and a second end of the second switch is a negative end of the power supply module.

10. The motor control circuit of claim 9, wherein the external power module is a dc charging post;

or, the external power supply module comprises an alternating current power supply, a filter and a rectifier which are connected in sequence, and the rectifier is connected with the first end of the first switch and the second end of the first switch.

11. A heating method of a vehicle based on the motor control circuit of claim 1, characterized by comprising:

the control module obtains that when a part to be heated needs to be heated, and enables energy to flow among the power supply module, the LC resonance module and the three-phase coil of the three-phase alternating current motor by controlling the on-off states of different power switch units in the three-phase inverter so as to heat a heat exchange medium flowing through at least one heat exchange medium pipeline in the LC resonance module, the three-phase inverter and the three-phase alternating current motor.

12. The heating method as claimed in claim 11, wherein the LC resonance module includes an inductance module and a capacitance module;

controlling on-off states of different power switch units in the three-phase inverter to enable energy to flow among the power supply module, the LC resonance module and three-phase coils of the three-phase alternating current motor so as to heat a heat exchange medium flowing through at least one heat exchange medium pipeline in the LC resonance module, the three-phase inverter and the three-phase alternating current motor, and the method comprises the following steps:

and controlling the first switch module to be in a conducting state, and enabling energy to flow among the power supply module, the capacitor module, the inductor module and a three-phase coil of the three-phase alternating current motor by controlling the on-off states of different power switch units in the three-phase inverter so as to heat a heat exchange medium flowing through at least one heat exchange medium pipeline in the capacitor module, the inductor module, the three-phase inverter and the three-phase alternating current motor.

13. The heating method according to claim 12, wherein the capacitance module, the three-phase inverter, the three-phase coil of the three-phase alternating current motor, the first switching module, and the inductance module form an LC resonance circuit, and the capacitance module, the three-phase coil of the three-phase alternating current motor, and the inductance module form an LC resonance unit;

the controlling of the on-off states of different power switch units in the three-phase inverter enables energy to flow among the power supply module, the capacitor module, the inductor module and a three-phase coil of the three-phase alternating current motor, and includes:

and controlling the on-off states of different power switch units in the three-phase inverter to enable the power supply module to charge the LC resonance unit and the LC resonance circuit to alternatively oscillate so as to enable energy to flow among the power supply module, the capacitor module, the inductor module and a three-phase coil of the three-phase alternating current motor.

14. The heating method according to claim 13, wherein the controlling of the on-off states of different power switch cells in the three-phase inverter causes the power supply module to charge the LC resonant cell and the LC resonant tank to oscillate alternately comprises:

controlling the on-off states of different power switch units in the three-phase inverter to enable the power supply module to charge the LC resonance unit, enabling the LC resonance circuit to be in an oscillation state, and enabling the power supply module to charge the LC resonance unit again when the obtained oscillation current of the LC resonance circuit is lower than a preset current threshold value, so that the power supply module charges the LC resonance unit and the LC resonance circuit alternately oscillates.

15. The heating method of claim 14, wherein the control module placing the LC tank in an oscillating state comprises:

the LC resonance circuit is enabled to sequentially pass through the state that the capacitance module discharges along the first current direction, the state that the three-phase coil of the three-phase alternating current motor and the inductance module discharge, the state that the three-phase coil of the three-phase alternating current motor and the inductance module charge along the second current direction, the state that the capacitance module discharges along the second current direction, the state that the three-phase coil of the three-phase alternating current motor and the inductance module discharge, the state that the three-phase coil of the three-phase alternating current motor and the inductance module charge along the first current direction, and the state that the capacitance module charges.

16. The heating method of claim 14, wherein recharging the LC resonant cell by the power supply module when the LC resonant tank oscillating current is below a preset current threshold comprises:

when the obtained LC resonance circuit oscillation current is lower than the preset current, when the state that the three-phase coil of the three-phase alternating current motor and the inductance module charge the capacitance module along the second current direction is finished or the state that the three-phase coil of the three-phase alternating current motor and the inductance module charge the capacitance module along the first current direction is finished, the power supply module charges the LC resonance unit again.

17. The heating method of claim 14, wherein recharging the LC resonant cell by the power supply module when the LC resonant tank oscillating current is below a preset current threshold comprises:

when the obtained LC resonance circuit oscillation current is lower than the preset current, and when the obtained current of the inductance module along the first current direction or along the second current direction is gradually reduced to 0, the power supply module is enabled to charge the LC resonance unit again.

18. The heating method according to claim 16 or 17, wherein the causing the power supply module to charge the LC resonance unit includes:

acquiring the resonant frequency of the LC resonant unit;

and adjusting the switching frequency and the switching duty ratio of a power switching unit in the three-phase inverter according to the resonant frequency of the LC resonant unit so as to adjust the oscillation current of the LC resonant circuit.

19. The heating method according to claim 11, wherein the capacitance module, the three-phase inverter, the three-phase coil of the three-phase alternating current motor, the first switching module, and the inductance module form an LC resonance circuit, and the capacitance module, the three-phase coil of the three-phase alternating current motor, and the inductance module form an LC resonance unit;

and controlling the three-phase inverter to enable the power supply module to charge the LC resonance unit, enabling the LC resonance circuit to be in an oscillation state, and enabling the LC resonance unit to discharge to the power supply module after the LC resonance circuit completes oscillation so as to enable energy to flow among the power supply module, the capacitor module, the inductor module and a three-phase coil of the three-phase alternating current motor.

20. The heating method of claim 19, wherein the control module placing the LC tank in an oscillating state comprises:

the LC resonance circuit passes through the capacitor module to discharge the three-phase coil of the three-phase alternating current motor and the inductor module along a first current direction, and the LC resonance circuit passes through the three-phase coil of the three-phase alternating current motor and the inductor module to charge the capacitor module along a second current direction.

21. The heating method of claim 19, wherein said causing the power supply module to charge the LC resonant cell comprises:

acquiring the resonant frequency of the LC resonant unit;

and adjusting the switching frequency of a power switching unit in the three-phase inverter according to the resonance frequency of the LC resonance unit so as to adjust the oscillation current of the LC resonance loop.

22. A vehicle characterized by comprising the motor control circuit of any one of claims 1 to 10.

23. The vehicle of claim 22, wherein the three-phase ac motor includes a motor shaft, a stator assembly, and a motor housing, the stator assembly is coupled to the motor shaft, the stator assembly is disposed in the motor housing, the motor housing has a heat exchange medium inlet and a heat exchange medium outlet, a heat exchange medium passage is disposed between the motor housing and the stator assembly, and the heat exchange medium passage is coupled to the heat exchange medium inlet and the heat exchange medium outlet.