CN111347901A - Vehicle, charging device and motor control circuit - Google Patents
Vehicle, charging device and motor control circuit Download PDFInfo
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- CN111347901A CN111347901A CN201811574197.4A CN201811574197A CN111347901A CN 111347901 A CN111347901 A CN 111347901A CN 201811574197 A CN201811574197 A CN 201811574197A CN 111347901 A CN111347901 A CN 111347901A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
In the application, the motor control circuit can work in a motor driving mode through the three-phase inverter, the three-phase alternating current motor and the motor control circuit of the first current sensing module, and can also work in a charging mode, and the working state of the three-phase inverter is controlled in the charging mode, so that the three-phase alternating current motor can boost the external power supply voltage to charge the power battery, the three-phase inverter can drive the three-phase alternating current motor according to the voltage output by the power battery by controlling the working state of the three-phase inverter in the motor driving mode, the multiplexing of the three-phase inverter in two working modes is realized, other switching elements are not required to be added, the circuit structure is simple, the cost is low, the reliability is high, and then solved prior art and had the problem that motor drive and charging system overall cost are high and the adaptability of whole car charging function is low.
Description
Technical Field
The application belongs to the technical field of electronics, especially relates to a vehicle, charging device, motor control circuit.
Background
Along with the development and rapid popularization of electric automobiles, the charging technology of the power battery of the electric automobile becomes more and more important, and the charging technology needs to meet the requirements of different users, the adaptability to different power batteries and different charging piles and the compatibility.
At present, the direct current charging of the power battery is generally divided into direct charging and boosting charging. The direct charging means that the positive and negative electrodes of the charging pile are directly connected with the positive and negative buses of the power battery through a contactor or a relay to directly charge the battery, and a voltage boosting or reducing circuit is not arranged in the middle; in the conventional boosting charging, a plurality of switching elements are added to a motor driving system of a vehicle to integrate motor driving and battery charging, so that the motor driving system of the vehicle and the plurality of switching elements form a boosting circuit and then boost and charge a power battery.
However, for direct charging, when the maximum output voltage of the charging pile is lower than the voltage of the power battery, the charging pile cannot charge the battery, and the adaptability of the charging function of the whole vehicle is realized; while the overall cost of existing motor drives and battery charging is high for the present boost charging.
In conclusion, the prior art has the problems that the overall cost of the motor driving and charging system is high and the adaptability of the charging function of the whole vehicle is low.
Disclosure of Invention
An object of the application is to provide a vehicle, charging device, motor control circuit, aim at solving the problem that prior art has motor drive and charging system overall cost height and the adaptability of whole car charging function is low.
The motor control circuit is used for realizing motor driving and power battery charging and receiving external power supply voltage output by an external power supply module, and comprises a switch control loop, a three-phase inverter, a first current sensing module and a three-phase alternating current motor;
when the motor control circuit works in a charging mode and the external power supply voltage is lower than the voltage of the power battery, the switch control loop controls the working state of the three-phase inverter, so that the external power supply voltage charges the three-phase alternating current motor through the three-phase inverter and the first current sensing module, and the three-phase alternating current motor is convenient to boost the external power supply voltage, and the external power supply module and the three-phase alternating current motor charge the power battery;
when the motor control circuit works in a motor driving mode, the switch control circuit controls the working state of the three-phase inverter, so that the three-phase inverter drives the three-phase alternating current motor according to the voltage output by the power battery;
the first current sensing module senses the current of the three-phase alternating current motor and feeds the sensed current back to the switch control loop, and the switch control loop controls the working state of the three-phase inverter according to the current.
Another object of the present application is to provide a power battery heating method based on the above motor control circuit, the power battery heating method including:
when the temperature of the power battery is detected to be lower than a preset temperature value, the second switch module is controlled to be switched off;
and controlling the three-phase inverter so that the three-phase inverter and the 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 according to the external power supply voltage, and further, when the heated heat exchange medium flows through the power battery again, the temperature of the power battery is increased.
Another objective of the present application is to provide a power battery charging method based on the above motor control circuit, the power battery charging method includes:
detecting the working mode of the motor control circuit;
when the working mode of the motor control circuit is a charging mode, acquiring an external power supply voltage and the voltage of a power battery, and judging the magnitude between the external power supply voltage and the voltage of the power battery;
when the external power supply voltage is lower than the voltage of the power battery and the power battery needs to be charged, the working state of the three-phase inverter is controlled, so that the external power supply voltage is charged to the three-phase alternating-current motor through the three-phase inverter and the first current sensing module, the three-phase alternating-current motor is convenient to boost the external power supply voltage, and the external power supply module and the three-phase alternating-current motor are charged to the power battery.
Another object of the present application is to provide a charging device, which includes the above-mentioned motor control circuit and an external power supply module, and the external power supply module is connected with the three-phase inverter and the energy storage module.
It is a further object of the present application to provide a vehicle including the motor control circuit and the power battery described above.
In the application, the motor control circuit can work in a motor driving mode through the three-phase inverter, the three-phase alternating current motor and the motor control circuit of the first current sensing module, and can also work in a charging mode, and the working state of the three-phase inverter is controlled in the charging mode, so that the three-phase alternating current motor can boost the external power supply voltage to charge the power battery, the three-phase inverter can drive the three-phase alternating current motor according to the voltage output by the power battery by controlling the working state of the three-phase inverter in the motor driving mode, the multiplexing of the three-phase inverter in two working modes is realized, other switching elements are not required to be added, the circuit structure is simple, the cost is low, the reliability is high, and then solved prior art and had the problem that motor drive and charging system overall cost are high and the adaptability of whole car charging function is low.
Drawings
Fig. 1 is a schematic block diagram of a motor control circuit according to a first embodiment of the present application;
fig. 2 is a schematic block diagram of a motor control circuit according to a second embodiment of the present application;
fig. 3 is a schematic circuit diagram of a motor control circuit according to a third embodiment of the present application;
fig. 4 is a schematic circuit diagram of a motor control circuit according to a fourth embodiment of the present application;
fig. 5 is a schematic circuit diagram of a motor control circuit according to a fifth embodiment of the present application;
fig. 6 is a schematic flow chart of a charging method for a power battery according to a sixth embodiment of the present application;
fig. 7 is a schematic flow chart of a method for heating a power battery according to a seventh 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.
Implementations of the present application are described in detail below with reference to the following detailed drawings:
fig. 1 shows a module structure of a motor control circuit 100 provided in a first embodiment of the present application, and for convenience of description, only the parts related to the present embodiment are shown, and detailed descriptions are as follows:
as shown in fig. 1, a motor control circuit 100 provided in the embodiment of the present application is used for implementing motor driving and power battery charging, and the motor control circuit 100 includes a switch control circuit 11, a three-phase inverter 12, a three-phase ac motor 13, and a first current sensing module 14.
Specifically, when the motor control circuit 100 operates in the charging mode and the external power supply voltage is lower than the voltage of the power battery, the switch control circuit 11 controls the operating state of the three-phase inverter 12, so that the external power supply voltage charges the three-phase ac motor 13 through the three-phase inverter 12 and the first current sensing module 14, so that the three-phase ac motor 13 boosts the external power supply voltage, and the external power supply module 200 and the three-phase ac motor 13 charge the power battery;
when the motor control circuit 100 operates in the motor drive mode, the switch control circuit 11 controls the operating state of the three-phase inverter 12, so that the three-phase inverter 12 drives the three-phase ac motor 13 according to the voltage output by the power battery;
the first current sensing module 14 senses a current of the three-phase ac motor 13, and feeds the sensed current back to the switch control circuit 11, and the switch control circuit 11 controls the operating state of the three-phase inverter 12 according to the current.
In practical implementation, in the embodiment of the present application, the operating state of the three-phase inverter 12 includes an on or off state of each rectifier switch in the three-phase inverter 12.
In the embodiment, the motor control circuit can work in a motor driving mode by adopting the three-phase inverter, the three-phase alternating current motor and the motor control circuit of the first current sensing module, and can also work in a charging mode, and the working state of the three-phase inverter is controlled in the charging mode, so that the three-phase alternating current motor can boost the external power supply voltage to charge the power battery, the three-phase inverter can drive the three-phase alternating current motor according to the voltage output by the power battery by controlling the working state of the three-phase inverter in the motor driving mode, the multiplexing of the three-phase inverter in two working modes is realized, other switching elements are not required to be added, the circuit structure is simple, the cost is low, the reliability is high, and then solved prior art and had the problem that motor drive and charging system overall cost are high and the adaptability of whole car charging function is low.
Further, as an embodiment of the present application, as shown in fig. 2, the motor control circuit 100 further includes an energy storage module 15, and the energy storage module 15 protects the three-phase inverter 12 when the three-phase inverter 12 is in operation.
Specifically, since a current is generated when the on/off state of the rectifier switch in the three-phase inverter 12 is switched, and the current will damage the rectifier switch, the energy storage module 15 absorbs the current when the three-phase inverter 12 is in operation, so as to prevent the current from damaging the rectifier switch, and further prolong the service life of the three-phase inverter 12.
Further, as an embodiment of the present application, as shown in fig. 2, the motor control circuit 100 further includes a second current sensing module 16, and when the motor control circuit 100 operates in the charging mode and the external power supply voltage is lower than the voltage of the power battery, the switch control circuit 11 controls the operating state of the three-phase inverter 12 so that the external power supply voltage charges the three-phase ac motor 13 through the three-phase inverter 12, the first current sensing module 14 and the second current sensing module 16, so that the three-phase ac motor 13 boosts the external power supply voltage and the external power supply module 200 and the three-phase ac motor 13 charge the power battery.
In the present embodiment, the second current sensing module 16 is added to the motor control circuit 100, so that when the three-phase ac motor 13 boosts the external power supply voltage and charges the power battery, the boost charging can be performed according to the voltages charged to the three-phase ac motor 13 by the first current sensing module 14 and the second current sensing module 16, and the charging speed is increased; in addition, when the first current sensing module 14 fails, the three-phase alternating current motor 13 can be charged through the second current sensing module 16, so that the reliability of the motor control circuit 100 is improved.
Further, as an embodiment of the present application, as shown in fig. 3, the three-phase inverter 12 is connected to the positive electrode of the external power supply module 200, the first end of the energy storage module 15 is connected to the positive terminal of the three-phase inverter 12 and the positive electrode of the power battery 300, the second end of the energy storage module 15 is connected to the negative terminal of the three-phase inverter 12, the negative electrode of the power battery 300 is connected with the negative electrode of the external power supply module 200, the first end of the first current sensing module 14 is connected with one phase of bridge arm of the three-phase inverter 12, the second end of the first current sensing module 14 is connected with one phase of coil of the three-phase ac motor 13, the first end of the second current sensing module 16 is connected with one phase of bridge arm of the two phase of bridge arm of the three-phase inverter 12 which is not connected with the first current sensing module 14, and the second end of the second current sensing module 16 is connected with one phase of coil of the two phase of coil of the three-phase ac motor 13 which is not connected with the first current sensing module 14.
In specific implementation, the three-phase inverter 12 includes a plurality of rectifier switches, the plurality of rectifier switches form a three-phase rectifier bridge, any one phase of the three-phase rectifier bridge is connected to the first current sensing module 14, and any one phase of the other two-phase rectifier bridge is connected to the second current sensing module 16; in the embodiment of the present application, the plurality of rectifier switches included in the three-phase inverter 12 may be implemented by devices that are connected in parallel with diodes and can perform switching operations, such as power transistors, Metal-Oxide-Semiconductor Field-Effect transistors (Metal-Oxide-Semiconductor Field-Effect transistors), MOSFETs, Insulated Gate Bipolar transistors (Insulated Gate Bipolar transistors), and switching devices such as IGBTs.
In a specific implementation, as shown in fig. 3, the three-phase inverter 12 includes six rectifier switches, which are a rectifier switch 1, a rectifier switch 2, a rectifier switch 3, a rectifier switch 4, a rectifier switch 5, and a rectifier switch 6, and the rectifier switch 1, the rectifier switch 2, the rectifier switch 3, the rectifier switch 4, the rectifier switch 5, and the rectifier switch 6 form a three-phase rectifier bridge. The rectifier switch 1 and the rectifier switch 2 form a phase rectifier bridge, the rectifier switch 1 is an upper arm rectifier switch in the phase rectifier bridge, and the rectifier switch 2 is a lower arm rectifier switch in the phase rectifier bridge; the rectifier switch 3 and the rectifier switch 4 form a phase rectifier bridge, the rectifier switch 3 is an upper arm rectifier switch in the phase rectifier bridge, and the rectifier switch 4 is a lower arm rectifier switch in the phase rectifier bridge; the rectifier switch 5 and the rectifier switch 6 form a phase rectifier bridge, and the rectifier switch 5 is an upper arm rectifier switch in the phase rectifier bridge, and the rectifier switch 6 is a lower arm rectifier switch in the phase rectifier bridge; the connection between any one of the three-phase rectifier bridges and the output end of the first current sensing module 14 means that the connection end between the rectifier switch 1 and the rectifier switch 2 is connected to the output end of the first current sensing module 14, or the connection end between the rectifier switch 3 and the rectifier switch 4 is connected to the output end of the first current sensing module 14, or the connection end between the rectifier switch 5 and the rectifier switch 6 is connected to the output end of the first current sensing module 14, and please refer to fig. 3 for specific connection.
Further, when the first current sensing module 14 is connected to the connection end of the rectifier switch 1 and the rectifier switch 2, the second current sensing module 16 is connected to the connection end of the rectifier switch 3 and the rectifier switch 4, or to the connection end of the rectifier switch 5 and the rectifier switch 6; when the first current sensing module 14 is connected with the connection end of the rectifier switch 3 and the rectifier switch 4, the second current sensing module 16 is connected with the connection end of the rectifier switch 1 and the rectifier switch 2, or connected with the connection end of the rectifier switch 5 and the rectifier switch 6; when the first current sensing module 14 is connected to the connection end of the rectifier switch 5 and the rectifier switch 6, the second current sensing module 16 is connected to the connection end of the rectifier switch 3 and the rectifier switch 4, or to the connection end of the rectifier switch 1 and the rectifier switch 2.
Further, as an embodiment of the present application, as shown in fig. 3, the energy storage module 15 includes an energy storage capacitor C, a first end of the energy storage capacitor C is a first end of the energy storage module 15, and a second end of the energy storage capacitor C is a second end of the energy storage module 15.
Further, as an embodiment of the present application, as shown in fig. 3, the first current sensing module 14 includes a first current sensor 9, a first end of the first current sensor 9 is a first end of the first current sensing module 14, and a second end of the first current sensor 9 is a second end of the first current sensing module 14.
In specific implementation, the first current sensor 9 may be connected to a common junction of the rectifier switch 1 and the rectifier switch 2, may also be connected to a common junction of the rectifier switch 3 and the rectifier switch 4, and similarly, the first current sensor 9 may also be connected to a common junction of the rectifier switch 5 and the rectifier switch 6, and the connection manner shown in fig. 3 is only an exemplary illustration.
Further, as an embodiment of the present application, as shown in fig. 3, the second current sensing module 16 includes a second current sensor 8, a first terminal of the second current sensor 8 is a first terminal of the second current sensing module 16, and a second terminal of the second current sensor 8 is a second terminal of the second current sensing module 16.
In specific implementation, the connection mode of the second current sensor 8 is as follows: when the first current sensor 9 is connected with the common junction of the rectifier switch 1 and the rectifier switch 2, the second current sensor 8 is connected with the common junction of the rectifier switch 3 and the rectifier switch 4, or the second current sensor 8 is connected with the common junction of the rectifier switch 5 and the rectifier switch 6; when the first current sensor 9 is connected with the common junction of the rectifier switch 3 and the rectifier switch 4, the second current sensor 8 is connected with the common junction of the rectifier switch 1 and the rectifier switch 2, or the second current sensor 8 is connected with the common junction of the rectifier switch 5 and the rectifier switch 6; when the first current sensor 9 is connected to the junction of the rectifier switch 5 and the rectifier switch 6, the second current sensor 8 is connected to the junction of the rectifier switch 3 and the rectifier switch 4, or the second current sensor 8 is connected to the junction of the rectifier switch 1 and the rectifier switch 2.
Further, as an embodiment of the present application, as shown in fig. 2, the motor control circuit 100 further includes a first switch module 17, and the first switch module 17 is configured to control on and off of a path between the three-phase inverters 12 of the external power supply module 200.
Further, as shown in fig. 2, an input terminal of the first switching module 17 is connected to the positive electrode of the external power supply module 200, and an output terminal of the first switching module 17 is connected to the three-phase inverter 12.
In practical implementation, as shown in fig. 4, the first switch module 17 includes a first switch element K1, a first terminal of the first switch element K1 is an input terminal of the first switch module 17, and a second terminal of the first switch element K1 is an output terminal of the first switch module 17.
In practical implementation, the first switch element K1 can be implemented by a single-pole single-throw switch, and it can be understood by those skilled in the art that the first switch element K1 can also be implemented by other devices having a switching function, such as a transistor, and is not limited herein.
In the embodiment, the first switch module 17 is disposed in the motor control circuit 100, so that the first switch module 17 can controllably connect or disconnect the connection line between the external power supply module 200 and the three-phase inverter 12 by using the on-off function of its switch, and when the motor control circuit 100 is applied to the motor driving function, if the switch K1 of the first switch module 17 is disconnected, the antenna length can be effectively reduced, and the radiation can be further reduced.
Further, as an embodiment of the present application, as shown in fig. 2, the motor control circuit 100 further includes a second switch module 18, and the second switch module 18 is used for controlling the conduction and the disconnection of the path between the power battery 300 and the three-phase inverter 12.
Further, as an embodiment of the present application, as shown in fig. 2, an input end of the second switch module 18 is connected to the first end of the energy storage module 15 and the positive end of the three-phase inverter 12, and an output end of the second switch module 18 is connected to the positive electrode of the power battery 300.
Further, as an embodiment of the present application, as shown in fig. 5, the second switch module 18 includes a second switch element K2, an input terminal of the second switch element K2 is an input terminal of the second switch module 18, and an output terminal of the second switch element K2 is an output terminal of the second switch module 18.
In practical implementation, the second switch element K2 can be implemented by a single-pole single-throw switch, and it will be understood by those skilled in the art that the second switch element K2 can also be implemented by other devices having a switching function, such as a transistor, and is not limited herein.
In this embodiment, the second switch module 18 is disposed in the motor control circuit 100, so that the second switch module 18 can controllably connect or disconnect the path between the external power supply module 200 and the power battery 300 by using the on/off function of its switch, and when the battery is heated by using the low-voltage power supply device, the power loss of the power battery is avoided.
The operation principle of the motor control circuit 100 provided in the present application is specifically described below by taking the circuit shown in fig. 3 as an example, and the following details are described below:
specifically, the implementation process of the boost charging of the motor control circuit 100 provided in the embodiment of the present application is as follows:
firstly, the process 1 is as follows: when the motor control circuit 100 is started, the switch control circuit 11 turns off all the switches, that is, the switch control circuit 11 turns off the rectifier switch 1, the rectifier switch 2, the rectifier switch 3, the rectifier switch 4, the rectifier switch 5, and the rectifier switch 6. If the voltage output by the external power supply module 200 is higher than the voltage of the power battery 300, the external power supply module 200 can directly charge the power battery 300 through the rectifier switch 1, and it should be noted that, because the rectifier switch 1 is a device that is connected with a diode in parallel and can perform a switching action, the external power supply module 200 can charge the power battery 300 through the rectifier switch 1; if the voltage output by the external power supply module 200 is lower than the voltage of the power battery 300, the next process is performed.
And (2) a process: the switch control circuit 11 turns on the rectifier switch 4 or the rectifier switch 6, or turns on the rectifier switch 4 and the rectifier switch 6 at the same time, at this time, the external power supply module 200 charges the three-phase alternating current motor 13, at this time, the electric energy is converted into magnetic energy, and after the state is maintained for a certain time, the next process is started.
And 3, process: the switch control circuit 11 disconnects the rectifier switch 4 or the rectifier switch 6, or disconnects the rectifier switch 4 and the rectifier switch 6 at the same time, and at this time, the external power supply module 200 and the three-phase alternating current motor 13 charge the power battery 300; it should be noted that if the switch control loop 11 in the process 2 is turned on by the rectifier switch 4, the switch control loop 11 in the process 3 is turned off by the rectifier switch 4, if the switch control loop 11 in the process 2 is turned on by the rectifier switch 6, the switch control loop 11 in the process 3 is turned off by the rectifier switch 6, and if the switch control loop 11 in the process 2 is turned on by the rectifier switch 4 and the rectifier switch 6, the switch control loop 11 in the process 3 is turned off by the rectifier switch 4 and the rectifier switch 6. Since the output voltage of the external power supply module 200 and the discharge voltage of the three-phase ac motor 13 are connected in series so that the total voltage is greater than the voltage of the power battery 300, the power battery 300 can be charged with a battery voltage higher than the output voltage of the external power supply module 200. After this state is maintained for a certain time, the next process is entered.
And 4, process: the current value of the three-phase alternating current motor 13 is acquired by the switch control circuit 11 and the current sensor 9, and the execution time of the "process 2" and the "process 3" is set by the current value of the three-phase alternating current motor 13, and the process returns to the "process 3".
The current flow of the above processes 1 to 4 is described in detail below, specifically as follows:
in the process 1, if the voltage output by the external power supply module 200 is higher than the voltage of the power battery 300, the current will flow out from the positive electrode of the external power supply module 200, flow through the rectifier switch 1, enter the positive electrode of the power battery 300, then flow out from the negative electrode of the power battery 300, and return to the negative electrode of the external power supply module 200.
In the process 2, if the switch control circuit 11 turns on the rectifier switch 4, the external power supply module 200 will charge the three-phase ac motor 13. At this time, the current flows out from the positive electrode of the external power supply module 200, flows through the three-phase ac motor 13, then flows through the first current sensor 9, then flows through the rectifier switch 4, and finally returns to the negative electrode of the external power supply module 200; if the switch control circuit 11 is turned on by the rectifier switch 6, the current flows out from the positive electrode of the external power supply module 200, flows through the three-phase alternating current motor 13, then flows through the second current sensor 8, then flows through the rectifier switch 6, and finally returns to the negative electrode of the external power supply module 200; it should be noted that, when the switch control circuit 11 is turned on by the rectifier switch 4 and the rectifier switch 6, the current flowing direction of the motor control circuit 100 may refer to the current flowing direction when the rectifier switch 4 and the rectifier switch 6 are turned on, and details thereof are not described here.
In the process 3, when the switch control circuit 11 turns off the rectifier switch 4, the external power supply module 200 discharges the power battery 300 together with the three-phase ac motor 13. At this time, the current flows out from the positive electrode of the external power supply module 200, flows through the three-phase ac motor 13, then flows through the first current sensor 9, then flows through the rectifier switch 3, enters the positive electrode of the power battery 300, flows out from the negative electrode of the power battery 300, and finally returns to the negative electrode of the external power supply module 200; when the switch control circuit 11 turns off the rectifier switch 6, the external power supply module 200 discharges the power battery 300 together with the three-phase ac motor 13. At this time, the current flows out from the positive electrode of the external power supply module 200, flows through the three-phase ac motor 13, then flows through the second current sensor 8, then flows through the rectifier switch 5, enters the positive electrode of the power battery 300, flows out from the negative electrode of the power battery 300, and finally returns to the negative electrode of the external power supply module 200; it should be noted that, when the switch control circuit 11 is turned off by the rectifier switch 4 and the rectifier switch 6, the current flowing direction of the motor control circuit 100 may refer to the current flowing direction when the rectifier switch 4 and the rectifier switch 6 are turned off, and details thereof are not described here.
In this embodiment, when the motor control circuit 100 provided by the present application implements a boost charging function, the rectifier switch 4 or the rectifier switch 6 that is originally used for implementing a motor driving function is used, so that the motor control circuit 100 does not need to add a rectifier switch and a power inductor, and requires few devices, thereby directly reducing the overall cost of the motor control circuit 100 and reducing the complexity of the system; in addition, the motor control circuit 100 provided by the application directly connects the positive electrode of the external power supply module 200 with any phase winding of the three-phase alternating current motor 13, or with a current sensor connected in series with any phase winding of the three-phase alternating current motor 13, so that the structure of the motor control circuit 100 is simpler and clearer, and the fault rate of the motor control circuit 100 is further reduced; in addition, when the motor control circuit 100 provided in the embodiment of the present application implements the boost charging function, the rectifier switch 4 or the rectifier switch 6 that is originally used to implement the motor driving function is used, so that the motor control circuit 100 does not need to add a rectifier switch and a power inductor, and the circuit cost is further reduced.
The operation principle of the first switch module 17 in the motor control circuit 100 provided by the present application is described below by taking the circuit shown in fig. 4 as an example, specifically as follows:
the switch control circuit 11 recognizes that the motor control circuit 100 specifically works in a motor driving function or a charging function, and if it recognizes that the motor control circuit 100 works in the charging function, controls the first switch element K1 of the first switch module 17 to be turned on, so that the motor control circuit 100 boosts and charges the power battery 300; if the motor control circuit 100 is identified to operate in the motor driving function, the first switch element K1 of the first switch module 17 is controlled to be turned on and off, so that the motor control circuit 100 stops the step-up charging of the power battery 300, thereby ensuring that the motor control circuit 100 operates in the motor driving function, and when the first switch element K1 is turned off, the purposes of reducing the length of the antenna and reducing the radiation can be achieved.
It should be noted that in the embodiment of the present application, "to reduce the length of the antenna" means that, when the motor driving function is applied, the wire connected from the positive electrode of the external power supply module 200 to the connection of the rectification switch 1 and the rectification switch 2 may be actually equivalent to an antenna for radiation emission, and if a switch K1 is connected thereto and the switch K1 is adjacent to the rectification switch 1 and the rectification switch 2 in an actual product, the length of the antenna may be reduced to achieve the purpose of reducing radiation.
The operation principle of the second switch module 18 in the motor control circuit 100 provided by the present application is described below by taking the circuit shown in fig. 5 as an example, specifically as follows:
the switch control circuit 11 controls the second switch element K2 of the second switch module 18 to be turned on when the power battery 300 is not completely charged, so that the motor control circuit 100 performs boost charging on the power battery 300, and the switch control circuit 11 controls the second switch element K2 of the second switch module 18 to be turned off when the power battery 300 is completely charged, so as to prevent the power battery 300 from reversely charging the external power module 200.
Further, as shown in fig. 6, the present application also provides a power battery charging method, which is implemented based on the foregoing motor control circuit 100. Specifically, the power battery charging method comprises the following steps:
step S61: and detecting the working mode of the motor control circuit.
Step S62: when the working mode of the motor control circuit is a charging mode, obtaining external power supply voltage and the voltage of a power battery, and judging the magnitude between the external power supply voltage and the voltage of the power battery.
Step S63: when the external power supply voltage is lower than the voltage of the power battery and the power battery needs to be charged, the working state of the three-phase inverter is controlled, so that the external power supply voltage is charged to the three-phase alternating-current motor through the three-phase inverter and the first current sensing module, the three-phase alternating-current motor is convenient to boost the external power supply voltage, and the external power supply module and the three-phase alternating-current motor are charged to the power battery.
It should be noted that, since the power battery charging method provided in the present application is implemented based on the motor control circuit 100, reference may be made to the foregoing description related to the motor control circuit 100 for a specific working process of the power battery charging method, and details are not repeated here.
Further, as shown in fig. 7, an embodiment of the present application further provides a power battery heating method, where the power battery heating method is implemented based on the motor control circuit shown in fig. 5. Specifically, the power battery heating method comprises the following steps:
step S71: and when the temperature of the power battery is detected to be lower than a preset temperature value, the second switch module is controlled to be disconnected.
Step S72: and controlling the three-phase inverter so that the three-phase inverter and the 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 according to the external power supply voltage, and further, when the heated heat exchange medium flows through the power battery again, the temperature of the power battery is increased.
The following describes the specific process of the motor control circuit 100 shown in fig. 5 when operating in the battery heating mode in detail, wherein the steps S71 and S72 are as follows:
the process 1 turns off the rectifier switches 2, 3, 4, 5, and 6, turns on the rectifier switch 1, and turns off the second switching element K2, at this time, the external power supply module 200 charges the capacitor C, and the current flows out from the positive electrode of the external power supply module 200, flows through the rectifier switch 1, flows into one end of the capacitor C, and then flows into the negative electrode of the external power supply module 200 from the other end of the capacitor C.
In the process 2, the rectifier switch 4 or the rectifier switch 6 is turned on, at this time, the external power supply module 200 charges and heats the winding of the three-phase ac motor 13, and the current flows out from the positive electrode of the external power supply module 200, enters the motor winding, flows out from the other phase winding, flows through the current sensor 9 or the current sensor 8, flows through the rectifier switch 4 or the rectifier switch 6, and finally returns to the negative electrode of the external power supply module 200.
And 3, switching off the rectifier switch 4 or the rectifier switch 6, wherein self-induction discharge of the winding of the three-phase alternating current motor 13 generates heat, and current flows out of the winding of the three-phase alternating current motor 13, flows through the current sensor 9 or the current sensor 8, then flows through the rectifier switch 3 or the rectifier switch 5, then flows through the rectifier switch 1, and finally returns to the winding of the three-phase alternating current motor 13.
In the embodiment, the motor control circuit provided by the application can drive the motor and charge the power battery, and can also heat the power battery.
Further, this application still provides a charging device, and this charging device includes motor control circuit and external power supply module, and this external power supply module is connected with three-phase inverter and energy storage module among the motor control circuit. It should be noted that, since the motor control circuit 100 provided in the embodiment of the present application is the same as the motor control circuit 100 provided in fig. 1 to 5, reference may be made to the foregoing detailed description about fig. 1 to 5 for a specific operation principle of the motor control circuit 100 in the charging device provided in the embodiment of the present application, and details thereof are not repeated here.
Further, the application also provides a vehicle, and the vehicle comprises a motor control circuit and a power battery. It should be noted that, since the motor control circuit 100 provided in the embodiment of the present application is the same as the motor control circuit 100 provided in fig. 1 to 5, reference may be made to the foregoing detailed description about fig. 1 to 5 for a specific operating principle of the motor control circuit 100 in the vehicle provided in the embodiment of the present application, and details are not repeated here.
In the present application, the present application provides a vehicle that, by employing a motor control circuit including a three-phase inverter, a three-phase alternating current motor, and a first current sensing module, allows the motor control circuit to operate not only in a motor drive mode, and can also work in a charging mode, and the working state of the three-phase inverter is controlled in the charging mode, so that the three-phase alternating current motor can boost the external power supply voltage to charge the power battery, the three-phase inverter can drive the three-phase alternating current motor according to the voltage output by the power battery by controlling the working state of the three-phase inverter in the motor driving mode, the multiplexing of the three-phase inverter in two working modes is realized, other switching elements are not required to be added, the circuit structure is simple, the cost is low, the reliability is high, and then solved prior art and had the problem that motor drive and charging system overall cost are high and the adaptability of whole car charging function is low.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (17)
1. A motor control circuit is used for realizing motor driving and power battery charging and receiving external power supply voltage output by an external power supply module, and comprises a switch control loop, and is characterized by comprising a three-phase inverter, a first current sensing module and a three-phase alternating current motor;
when the motor control circuit works in a charging mode and the external power supply voltage is lower than the voltage of the power battery, the switch control loop controls the working state of the three-phase inverter, so that the external power supply voltage charges the three-phase alternating current motor through the three-phase inverter and the first current sensing module, and the three-phase alternating current motor is convenient to boost the external power supply voltage, and the external power supply module and the three-phase alternating current motor charge the power battery;
when the motor control circuit works in a motor driving mode, the switch control circuit controls the working state of the three-phase inverter, so that the three-phase inverter drives the three-phase alternating current motor according to the voltage output by the power battery;
the first current sensing module senses the current of the three-phase alternating current motor and feeds the sensed current back to the switch control loop, and the switch control loop controls the working state of the three-phase inverter according to the current.
2. The motor control circuit of claim 1 further comprising an energy storage module that protects the three-phase inverter when the three-phase inverter is operating.
3. The motor control circuit of claim 2 further comprising a second current sensing module, wherein when the motor control circuit is operating in a charging mode and the external supply voltage is lower than the voltage of the power battery, the switch control circuit controls the operating state of the three-phase inverter such that the external supply voltage charges the three-phase ac motor through the three-phase inverter, the first current sensing module, and the second current sensing module, so that the three-phase ac motor boosts the external supply voltage to charge the power battery through the external supply module and the three-phase ac motor.
4. The motor control circuit of claim 3 wherein said three-phase inverter is connected to an external power module positive pole, the first end of the energy storage module is connected with the positive end of the three-phase inverter and the positive electrode of the power battery, the second end of the energy storage module is connected with the negative end of the three-phase inverter, the negative electrode of the power battery and the negative electrode of the external power supply module, the first end of the first current sensing module is connected with a phase bridge arm of the three-phase inverter, the second end of the first current sensing module is connected with a phase coil of the three-phase alternating current motor, the first end of the second current sensing module is connected with one phase of bridge arms in the two phases of the three-phase inverter which are not connected with the first current sensing module, and the second end of the second current sensing module is connected with one phase of coil in the two-phase coil which is not connected with the first current sensing module in the three-phase alternating current motor.
5. The motor control circuit of claim 4 wherein the energy storage module comprises an energy storage capacitor, wherein a first end of the energy storage capacitor is a first end of the energy storage module and a second end of the energy storage capacitor is a second end of the energy storage module.
6. The motor control circuit of claim 4 wherein said first current sensing module comprises a first current sensor, a first end of said first current sensor being a first end of said first current sensing module, a second end of said first current sensor being a second end of said first current sensing module.
7. The motor control circuit of claim 4 wherein said second current sensing module comprises a second current sensor, a first end of said second current sensor being a first end of said second current sensing module, a second end of said second current sensor being a second end of said second current sensing module.
8. The motor control circuit according to any one of claims 3 to 7, further comprising a first switching module for controlling conduction and disconnection of a path between the external power supply module and the three-phase inverter.
9. The motor control circuit of claim 8 wherein the input of the first switching module is connected to the positive pole of the external power supply module and the output of the first switching module is connected to the three-phase inverter.
10. The motor control circuit of claim 9 wherein the first switch module includes a first switch element, a first terminal of the first switch element being an input terminal of the first switch module, and a second terminal of the first switch element being an output terminal of the first switch module.
11. The motor control circuit according to any one of claims 3 to 7, further comprising a second switching module for controlling conduction and disconnection of a path between the power battery and the three-phase inverter.
12. The motor control circuit of claim 11 wherein the input of the second switching module is connected to the first end of the energy storage module and to the positive end of the three-phase inverter and the output of the second switching module is connected to the positive pole of the power cell.
13. The motor control circuit of claim 12 wherein the second switch module includes a second switch element, an input of the second switch element being an input of the second switch module, and an output of the second switch element being an output of the second switch module.
14. A power battery heating method based on the motor control circuit of claim 11, wherein the power battery heating method comprises:
when the temperature of the power battery is detected to be lower than a preset temperature value, the second switch module is controlled to be switched off;
and controlling the three-phase inverter so that the three-phase inverter and the 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 according to the external power supply voltage, and further, when the heated heat exchange medium flows through the power battery again, the temperature of the power battery is increased.
15. A power battery charging method based on the motor control circuit of claim 1, wherein the power battery charging method comprises:
detecting the working mode of the motor control circuit;
when the working mode of the motor control circuit is a charging mode, acquiring an external power supply voltage and the voltage of a power battery, and judging the magnitude between the external power supply voltage and the voltage of the power battery;
when the external power supply voltage is lower than the voltage of the power battery and the power battery needs to be charged, the working state of the three-phase inverter is controlled, so that the external power supply voltage is charged to the three-phase alternating-current motor through the three-phase inverter and the first current sensing module, the three-phase alternating-current motor is convenient to boost the external power supply voltage, and the external power supply module and the three-phase alternating-current motor are charged to the power battery.
16. A charging device, characterized in that it comprises a motor control circuit according to any one of claims 2 to 13 and an external power supply module connected to the three-phase inverter and to the energy storage module.
17. A vehicle characterized by comprising the motor control circuit according to any one of claims 1 to 13 and a power battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811574197.4A CN111347901A (en) | 2018-12-21 | 2018-12-21 | Vehicle, charging device and motor control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811574197.4A CN111347901A (en) | 2018-12-21 | 2018-12-21 | Vehicle, charging device and motor control circuit |
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| CN111347901A true CN111347901A (en) | 2020-06-30 |
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| CN201811574197.4A Pending CN111347901A (en) | 2018-12-21 | 2018-12-21 | Vehicle, charging device and motor control circuit |
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| CN116533779A (en) * | 2023-05-31 | 2023-08-04 | 广州小鹏汽车科技有限公司 | Control method of charging circuit, electric vehicle, and storage medium |
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