CN114683884A - Electric automobile charging system and electric automobile - Google Patents

Electric automobile charging system and electric automobile Download PDF

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Publication number
CN114683884A
CN114683884A CN202111339910.9A CN202111339910A CN114683884A CN 114683884 A CN114683884 A CN 114683884A CN 202111339910 A CN202111339910 A CN 202111339910A CN 114683884 A CN114683884 A CN 114683884A
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CN
China
Prior art keywords
switching tube
motor
battery
rotor
bridge arm
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Granted
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CN202111339910.9A
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Chinese (zh)
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CN114683884B (en
Inventor
王东萃
王健
倪攀
陆建国
聂铜
吴万文
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SAIC Motor Corp Ltd
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SAIC Motor Corp Ltd
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Priority to CN202111339910.9A priority Critical patent/CN114683884B/en
Publication of CN114683884A publication Critical patent/CN114683884A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/14—Conductive energy transfer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/14—Conductive energy transfer
    • B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • 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
    • 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
    • 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

The application discloses electric automobile charging system and electric automobile, this system includes: the motor comprises a motor inductor, a motor controller and a bridge arm switch; the motor controller comprises an inverter and a control unit; the inverter comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube; the first end of the first switch tube is connected with the first end of the bridge arm switch; the second end of the bridge arm switch is connected with the first end of the second switching tube; the control unit is used for controlling the bridge arm switch and the fourth switching tube to be switched off, and the first switching tube to be switched on; and the control circuit is also used for controlling the fifth switching tube and the sixth switching tube to be closed or opened so as to enable the voltage output by the charging pile to be increased and then output to the battery. The electric automobile charging system can be used for matching the charging pile with lower output voltage without additionally increasing the booster circuit, so that the cost of the electric automobile charging system is reduced.

Description

Electric automobile charging system and electric automobile
Technical Field
The application relates to the field of electric automobiles, in particular to an electric automobile charging system and an electric automobile.
Background
With the development of new energy, the application of electric vehicles is also more and more extensive. The output voltage of the existing charging pile may be smaller than the rated charging voltage of the battery of the electric automobile. In order to boost the output voltage of the charging pile and thus charge the battery, a boost circuit may be included in the charging system in the electric vehicle. Through this boost circuit, electric automobile can rise the voltage that fills electric pile output, charges for electric automobile's battery again to make electric automobile can match the lower electric pile that fills of output voltage.
However, the additional boost circuit will increase the cost of the electric vehicle and occupy the space of the equipment inside the electric vehicle, so a battery vehicle charging system with lower cost and smaller occupied space is urgently needed at present.
Disclosure of Invention
In order to solve the technical problem, the application provides an electric vehicle charging system and an electric vehicle, which are used for reducing the cost and occupied space of the charging system.
In order to achieve the above purpose, the technical solutions provided in the embodiments of the present application are as follows:
the embodiment of the application provides an electric automobile charging system, includes: the motor comprises a motor inductor, a motor controller and a bridge arm switch;
the motor controller comprises an inverter and a control unit; the inverter comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the first end of the first switch tube is connected with the first end of the bridge arm switch; the second end of the bridge arm switch is connected with the first end of the second switch tube; the first end of the second switching tube and the first end of the third switching tube are used for being connected with the first input end of the battery; the second end of the first switching tube is connected with the first end of the fourth switching tube; the second end of the second switch tube is connected with the first end of the fifth switch tube; the second end of the third switching tube is connected with the first end of the sixth switching tube; the second end of the fourth switching tube, the second end of the fifth switching tube and the second end of the sixth switching tube are used for being connected with the second input end of the battery;
the first end of the motor inductor is connected with the second end of the first switching tube, the second end of the motor inductor is connected with the second end of the second switching tube, and the third end of the motor inductor is connected with the second end of the third switching tube;
the control unit is used for controlling the bridge arm switch and the fourth switching tube to be switched off, and the first switching tube is switched on; the control unit is further used for controlling the fifth switching tube and the sixth switching tube to be both closed or both opened, so that the voltage output by the charging pile is increased and then output to the battery.
As a possible implementation manner, the control unit is further configured to close the bridge arm switch when the output voltage of the charging pile is smaller than the charging voltage of the battery.
As a possible implementation, the method further includes: a capacitor;
the first end of the capacitor is connected with the first output end of the charging pile; and the second end of the capacitor is connected with the second output end of the charging pile.
As a possible implementation manner, the control unit is further configured to control the on/off of the inverter so that the battery precharges the capacitor.
As a possible implementation, the method further includes: a clutch;
and the clutch is used for enabling a rotor of the motor to be disconnected from the electric shaft when the motor controller is connected with the charging pile and the bridge arm switch is disconnected.
As a possible implementation, the method further includes: a parking device;
and the parking device is used for fixing a rotor of the motor when the motor controller is connected with the charging pile and the bridge arm switch is disconnected.
As a possible embodiment, the clutch of the electric vehicle is a single-phase clutch, and the motor controller is further configured to control the rotor of the motor to rotate to a horizontal position where a magnetic field direction of the rotor and a magnetic field direction of the stator are at the same level when the first switch is closed.
As a possible implementation, the motor controller is specifically configured to: when the position of the rotor is in a first range, controlling the voltage of the rotor to be a preset voltage so as to enable the rotor of the motor to rotate to a position where the magnetic field direction of the rotor and the magnetic field direction of the stator are at the same horizontal position; and when the position of the rotor is in a second range, applying preset torque to the rotor so as to enable the rotor to rotate to a position corresponding to the first range.
The embodiment of the present application further provides an electric automobile, including: the motor comprises a motor inductor, a motor controller and a bridge arm switch;
the motor controller comprises an inverter and a control unit; the inverter comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the first end of the first switch tube is connected with the first end of the bridge arm switch; the second end of the bridge arm switch is connected with the first end of the second switch tube; the first end of the second switching tube and the first end of the third switching tube are used for being connected with the first input end of the battery; the second end of the first switching tube is connected with the first end of the fourth switching tube; the second end of the second switching tube is connected with the first end of the fifth switching tube; the second end of the third switching tube is connected with the first end of the sixth switching tube; the second end of the fourth switching tube, the second end of the fifth switching tube and the second end of the sixth switching tube are used for being connected with the second input end of the battery;
the first end of the motor inductor is connected with the second end of the first switching tube, the second end of the motor inductor is connected with the second end of the second switching tube, and the third end of the motor inductor is connected with the second end of the third switching tube;
the control unit is used for controlling the bridge arm switch and the fourth switching tube to be switched off, and the first switching tube is switched on; the control unit is further used for controlling the fifth switching tube and the sixth switching tube to be both closed or both opened, so that the voltage output by the charging pile is increased and then output to the battery.
As a possible implementation manner, the control unit is further configured to close the bridge arm switch when the output voltage of the charging pile is smaller than the charging voltage of the battery.
According to the technical scheme, the method has the following beneficial effects:
the embodiment of the application provides an electric automobile charging system, includes: the motor comprises a motor inductor, a motor controller and a bridge arm switch; the motor controller comprises an inverter and a control unit; the inverter comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube; the first end of the first switch tube is connected with the first end of the bridge arm switch; the second end of the bridge arm switch is connected with the first end of the second switching tube; the first end of the second switching tube and the first end of the third switching tube are used for being connected with a first input end of a battery; the second end of the first switching tube is connected with the first end of the fourth switching tube; the second end of the second switching tube is connected with the first end of the fifth switching tube; the second end of the third switching tube is connected with the first end of the sixth switching tube; the second end of the fourth switching tube, the second end of the fifth switching tube and the second end of the sixth switching tube are used for being connected with the second input end of the battery; the first end of the motor inductor is connected with the second end of the first switching tube, the second end of the motor inductor is connected with the second end of the second switching tube, and the third end of the motor inductor is connected with the second end of the third switching tube; the control unit is used for controlling the bridge arm switch and the fourth switching tube to be switched off, and the first switching tube to be switched on; and the control unit is also used for controlling the fifth switching tube and the sixth switching tube to be closed or opened so as to enable the voltage output by the charging pile to be increased and then output to the battery.
Therefore, the electric vehicle charging system provided by the embodiment of the application uses the motor inductor as the inductor in the voltage boost circuit, and uses the motor controller as the switch and the diode in the voltage boost circuit, so that the original components in the electric vehicle are used to form the voltage boost circuit for charging the battery of the electric vehicle, and the voltage output by the charging pile is increased and then output to the battery. So, the electric automobile charging system that this application embodiment provided can be under the prerequisite that does not additionally increase boost circuit for electric automobile can match the lower electric pile that fills of output voltage, has reduced electric automobile charging system's cost, has also reduced the space that charging system occupies inside the electric automobile.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are 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 creative efforts.
Fig. 1 is a schematic diagram of an electric vehicle charging system according to an embodiment of the present disclosure;
fig. 2 is a schematic view of another electric vehicle charging system provided in the embodiment of the present application;
fig. 3 is a schematic diagram of a motor rotor control method according to an embodiment of the present application;
fig. 4 is a schematic view of an electric vehicle according to an embodiment of the present application.
Detailed Description
In order to help better understand the scheme provided by the embodiment of the present application, before describing the method provided by the embodiment of the present application, a scenario of an application of the scheme of the embodiment of the present application is described.
With the development of new energy, the application of electric vehicles is also more and more extensive. The output voltage of the existing charging pile may be smaller than the rated charging voltage of the battery of the electric automobile. In order to boost the output voltage of the charging pile and thus charge the battery, a boost circuit may be included in the charging system in the electric vehicle. Through this boost circuit, electric automobile can rise the voltage that fills electric pile output, charges for electric automobile's battery again to make electric automobile can match the lower electric pile that fills of output voltage. However, the additional boost circuit will increase the cost of the electric vehicle and occupy the space of the equipment inside the electric vehicle, so that a battery vehicle charging system with lower cost and smaller occupied space is urgently needed.
In order to solve the above technical problem, an embodiment of the present application provides an electric vehicle charging system, in which a motor inductor is used as an inductor in a voltage boost circuit, and a switching tube in a motor controller is used as a switching tube in the voltage boost circuit, so that a voltage boost circuit for charging a battery of an electric vehicle is formed by using original components in the electric vehicle, and a voltage output by a charging pile is increased and then output to the battery. So, the electric automobile charging system that this application embodiment provided can be under the prerequisite that does not additionally increase boost circuit for electric automobile can match the lower electric pile that fills of output voltage, has reduced electric automobile charging system's cost, has also reduced the space that charging system occupies inside the electric automobile.
The first to fifth switching tubes provided in the embodiments of the present application may be Insulated Gate Bipolar Transistors (IGBTs) or Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs). The specific structures of the first group of switching tubes and the second group of switching tubes provided by the embodiments of the present application will be specifically described below by taking IGBTs as examples and referring to the drawings.
Referring to fig. 1, the figure is a schematic diagram of an electric vehicle charging system provided in an embodiment of the present application.
As shown in fig. 1, an electric vehicle charging system provided in an embodiment of the present application includes: motor inductor 100, motor controller 200, and bridge arm switch Q;
motor controller 200 includes inverter 201 and control unit 202; the inverter 201 includes a first switching tube K1, a second switching tube K2, a third switching tube K3, a fourth switching tube K4, a fifth switching tube K5, and a sixth switching tube K6.
A first end of the first switching tube K1 is connected with a first end of the bridge arm switch Q; the second end of the bridge arm switch Q is connected with the first end of a second switch tube K2; the first end of the second switching tube K2 and the first end of the third switching tube K3 are used for connecting a first input end of the battery 400; the second end of the first switching tube K1 is connected to the first end of the fourth switching tube K4; the second end of the second switch tube K2 is connected with the first end of the fifth switch tube K5; the second end of the third switching tube K3 is connected with the first end of the sixth switching tube K6; the second end of the fourth switching tube K4, the second end of the fifth switching tube K5 and the second end of the sixth switching tube K6 are used for connecting a second input end of the battery 400.
The first end of the motor inductor 100 is connected to the second end of the first switching tube K1, the second end of the motor inductor 100 is connected to the second end of the second switching tube K2, and the third end of the motor inductor 100 is connected to the second end of the third switching tube K3.
The control unit 202 is used for controlling the bridge arm switch Q and the fourth switching tube K4 to be switched off, and the first switching tube K1 to be switched on; the control unit 202 is further configured to control the fifth switching tube K5 and the sixth switching tube K6 to be both closed or both opened, so that the voltage output by the charging pile 300 is increased and then output to the battery 400.
For convenience of description, the first output end of the charging pile is taken as a positive output end, and the first input end of the battery is taken as a positive electrode to describe the scheme provided by the embodiment of the application. It should be understood that when the control unit controls the fifth switch tube K5 and the sixth switch tube K6 to be closed, the current flows from the positive output end of the charging pile through the first switch tube K1, then flows through the motor inductor, and then flows through the fifth switch tube K5 and the sixth switch tube K6 respectively and flows into the negative output end of the charging pile. So, connecting in parallel of motor inductance between the positive output end and the negative output end of filling electric pile, fill electric pile and charge for the inductance, the electric current increase on the inductance.
When the control unit controls the fifth switching tube K5 and the sixth switching tube K6 to be disconnected, current flows out from the stamped output end, passes through the first switching tube K1, then flows through the motor inductor, flows through the diode in the second switching tube K2 and the diode in the third switching tube K3 respectively, flows into the positive electrode of the battery, flows out of the negative electrode of the battery, and flows into the negative output end of the charging pile. So, fill electric pile and motor inductance series connection and charge for the battery, the electric current on the motor inductance reduces. Because fill electric pile and motor inductance series connection and charge for the battery, the charging voltage at battery both ends is greater than the voltage of filling electric pile output to the voltage that makes to fill electric pile output risees the back and exports for the battery.
Therefore, the electric automobile charging system provided by the embodiment of the application can match the charging pile with lower output voltage without additionally increasing the booster circuit, so that the cost of the electric automobile charging system is reduced, and the space occupied by the charging system in the electric automobile is also reduced.
As a possible implementation manner, the control unit provided in this embodiment of the present application may be further configured to close the bridge arm switch when the output voltage of the charging pile is less than the charging voltage of the battery. It should be understood that when the output voltage of the charging pile is smaller than the charging voltage of the battery, the bridge arm switch is switched off, and the voltage output by the charging pile is boosted by the motor inductor and the motor controller and then output to the battery, so that the battery can be matched with the charging pile with smaller output voltage. When the output voltage of the charging pile is equal to or greater than the charging voltage of the battery, the bridge arm switch is closed, and the charging pile can directly charge the battery, so that the battery can be matched with the charging pile with larger output voltage. Therefore, the electric automobile can be matched with charging piles with different output voltages.
As a possible implementation manner, an embodiment of the present application provides a charging system, which may further include a capacitor.
Referring to fig. 2, the figure is a schematic view of another electric vehicle charging system provided in the embodiment of the present application.
As shown in fig. 2, a first end of a capacitor C in the electric vehicle charging system provided in the embodiment of the present application is connected to a positive output end of a charging pile 300; the second end of the capacitor C is connected to the negative output terminal of the charging pile 300. It should be understood that the capacitor C is connected in parallel between the first output terminal and the second output terminal of the charging pile 300, so that the effect of stabilizing the output voltage of the charging pile 3000 can be achieved, and the voltage output by the charging pile 300 is stable. It should be noted that, in practical applications, the capacitor provided in the embodiments of the present application may be connected in parallel to two ends of a charging port of an electric vehicle, and before the electric vehicle is connected to a charging pile, the capacitor connects a simulation battery to the charging pile at a lower voltage.
As a possible implementation manner, the control unit provided in the embodiment of the present application may be further configured to control the on/off of the inverter, so that the battery precharges the capacitor. It should be understood that before charging the battery by the charging pile, the battery needs to be precharged to the capacitor through the motor controller, so as to avoid the capacitor from being damaged. When the output voltage of the charging pile is smaller than the charging voltage of the battery, the bridge arm switch is disconnected, the opening and closing of six switch tubes in the motor controller are controlled, the battery is enabled to pre-charge the capacitor, then the capacitor is controlled to be connected with the charging pile, and the motor controller is controlled to increase the voltage output by the charging pile and output the voltage to the battery. When the output voltage of the charging pile is larger than or equal to the charging voltage of the battery, the bridge arm switch is disconnected, the opening and closing of six switching tubes in the motor controller are controlled, the battery is enabled to pre-charge the capacitor, then the bridge arm switch is closed, then the capacitor is controlled to be connected with the charging pile, and the charging pile directly charges the battery.
In addition, according to the embodiment of the present invention, when the electric vehicle is running, the motor controller needs to control the output torque of the UVW three-phase arm driving battery, so that the arm switch is always closed when the electric vehicle is running.
When the charging circuit is used for charging a battery, the applicant finds that the rotor of the motor rotates to drive the electric automobile to generate displacement due to possible difference of currents on the first inductor, the second inductor and the third inductor in the motor inductor, so that the electric automobile generates displacement during charging, and safety risk is brought. In order to solve this problem, three schemes are provided as examples in the embodiments of the present application, and the three schemes provided in the embodiments of the present application will be described below.
As a possible implementation manner, the electric vehicle charging system provided in the embodiment of the present application further includes: a clutch. The clutch is used for enabling the rotor of the motor to be disconnected from the electric shaft when the first switch is closed. It will be appreciated that when the first switch is closed, the battery of the electric vehicle is being charged through the motor inductance and the motor controller, which will produce an uneven current flow across the motor inductance, thereby causing the rotor of the motor to disengage from the electric shaft. Therefore, when the rotor of the motor rotates, the electric shaft is not driven to rotate, and the electric automobile is prevented from generating displacement.
As another possible implementation manner, an electric vehicle charging system provided in an embodiment of the present application further includes: a parking device. And the parking device is used for fixing the rotor of the motor when the first switch is closed. It should be understood that when the first switch is closed, the battery of the electric vehicle is being charged through the motor inductor and the motor controller, and uneven current is generated on the motor inductor, so that the rotor of the motor can be fixed through the parking device, and the electric vehicle is prevented from being displaced.
As another possible implementation manner, the clutch of the electric vehicle provided in the embodiment of the present application is a single-phase clutch, and the motor controller is further configured to control the rotor of the motor to rotate to a horizontal position where a magnetic field direction of the rotor and a magnetic field direction of the stator are at the same horizontal position when the first switch is closed.
Specifically, the motor controller is specifically configured to: when the position of the rotor is in a first range, controlling the voltage of the stator to be a preset voltage so as to enable the rotor of the motor to rotate to a position where the magnetic field direction of the rotor and the magnetic field direction of the stator are at the same horizontal position; and when the position of the rotor is in the second range, applying preset torque to the rotor so as to enable the rotor to rotate to a position corresponding to the first range. It will be appreciated that when the rotor of the machine is rotated to a position where the magnetic field direction of the rotor is level with the magnetic field direction of the stator, the rotor does not produce a positive torque. If the rotor rotates to generate negative torque, the electric automobile can not be displaced by the negative torque because the clutch of the electric automobile is a single-phase clutch.
Referring to fig. 3, the figure is a schematic diagram of a motor rotor control method provided in an embodiment of the present application.
As an example, with a magnetic field direction of a rotor of a motor rotating to the rotor and a magnetic field direction of a stator at the same horizontal position as 0 °, when the rotor of the motor is at 45 ° to 180 °, a preset torque, which is a negative torque, is applied to the rotor of the motor so that the position of the rotor of the motor is at 0 ° to 45 °, and then a preset voltage is applied to the stator so that the position of the rotor is at 5 ° to-5 °, that is, the magnetic field direction of the rotor of the motor rotating to the rotor and the magnetic field direction of the stator are at the same horizontal position.
When the rotor of the motor is at 225 ° to 360 °, a preset torque, which is a negative torque, is applied to the rotor of the motor so that the rotor of the motor is at 180 ° to 225 °, and then a negative preset voltage is applied to the stator so that the rotor is at 175 ° to 185 °, that is, the rotor of the motor rotates to a position where the magnetic field direction of the rotor and the magnetic field direction of the stator are at the same horizontal position.
In a practical application, when the negative torque is applied, if the rotor of the motor does not reach a position (45 ° to 180 ° or 180 ° to 225 °) where the preset voltage is applied, the negative torque may be reapplied and the position of the rotor of the motor may be measured again until the rotor reaches a position where the preset voltage may be applied. When the rotor of the motor is located at a position (45 ° to 180 ° or 180 ° to 225 °) where the preset voltage is applied, the preset voltage may be directly applied to the stator without applying the preset torque to the rotor, so that the direction of the magnetic field of the rotor rotating the motor is located at the same horizontal position as the direction of the magnetic field of the stator.
To sum up, the electric automobile charging system that this application embodiment provided through utilizing the inductance of motor as the inductance in the boost circuit, regards motor controller as switch and diode in the boost circuit to utilize original part among the electric automobile, constituted the boost circuit that charges for the electric automobile battery, so that the output is exported for the battery after the voltage that fills electric pile output risees. So, the electric automobile charging system that this application embodiment provided can be under the prerequisite that does not additionally increase boost circuit for electric automobile can match the lower electric pile that fills of output voltage, has reduced electric automobile charging system's cost, has also reduced the space that charging system occupies inside the electric automobile.
According to the electric automobile charging system provided by the embodiment, the embodiment of the application further provides an electric automobile.
Referring to fig. 4, the drawing is a schematic view of an electric vehicle according to an embodiment of the present application.
As shown in fig. 4, an electric vehicle according to an embodiment of the present application includes: motor inductor 100, motor controller 200, battery 400, and bridge arm switch Q;
motor controller 200 includes inverter 201 and control unit 202; the inverter 201 includes a first switching tube K1, a second switching tube K2, a third switching tube K3, a fourth switching tube K4, a fifth switching tube K5, and a sixth switching tube K6.
A first end of a first switching tube K1 is connected with a first end of a bridge arm switch Q; the second end of the bridge arm switch Q is connected with the first end of a second switch tube K2; the first end of the second switching tube K2 and the first end of the third switching tube K3 are connected with the first input end of the battery 400; the second end of the first switch tube K1 is connected with the first end of the fourth switch tube K4; the second end of the second switch tube K2 is connected with the first end of the fifth switch tube K5; the second end of the third switching tube K3 is connected with the first end of the sixth switching tube K6; the second end of the fourth switching tube K4, the second end of the fifth switching tube K5 and the second end of the sixth switching tube K6 are used for connecting a second input end of the battery 400.
The first end of the motor inductor 100 is connected to the second end of the first switching tube K1, the second end of the motor inductor 100 is connected to the second end of the second switching tube K2, and the third end of the motor inductor 100 is connected to the second end of the third switching tube K3.
The control unit 202 is used for controlling the bridge arm switch Q and the fourth switching tube K4 to be switched off, and the first switching tube K1 to be switched on; the control unit 202 is further configured to control the fifth switching tube K5 and the sixth switching tube K6 to be both closed or both opened, so that the voltage output by the charging pile 300 is increased and then output to the battery 400.
The embodiment of the application provides an electric automobile charging system, through utilizing the inductance in the motor inductance conduct booster circuit, regard motor controller as switch and diode in the booster circuit, thereby utilize original part among the electric automobile, the booster circuit who charges has been constituted for the electric automobile battery, so that output for the battery after the voltage that fills electric pile output risees, can be under the prerequisite that does not additionally increase booster circuit, make electric automobile can match the lower electric pile that fills of output voltage, electric automobile charging system's cost has been reduced, the space that charging system took inside the electric automobile has also been reduced.
From the above description of the embodiments, it is clear to those skilled in the art that all or part of the steps in the method of the above embodiments may be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing description of the disclosed embodiments will enable those skilled in the art to make or use the invention in various modifications to these embodiments, which will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An electric vehicle charging system, comprising: the motor comprises a motor inductor, a motor controller and a bridge arm switch;
the motor controller comprises an inverter and a control unit; the inverter comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the first end of the first switch tube is connected with the first end of the bridge arm switch; the second end of the bridge arm switch is connected with the first end of the second switch tube; the first end of the second switching tube and the first end of the third switching tube are used for being connected with the first input end of the battery; the second end of the first switching tube is connected with the first end of the fourth switching tube; the second end of the second switching tube is connected with the first end of the fifth switching tube; the second end of the third switching tube is connected with the first end of the sixth switching tube; the second end of the fourth switching tube, the second end of the fifth switching tube and the second end of the sixth switching tube are used for being connected with the second input end of the battery;
the first end of the motor inductor is connected with the second end of the first switching tube, the second end of the motor inductor is connected with the second end of the second switching tube, and the third end of the motor inductor is connected with the second end of the third switching tube;
the control unit is used for controlling the bridge arm switch and the fourth switching tube to be switched off, and the first switching tube is switched on; the control unit is further used for controlling the fifth switching tube and the sixth switching tube to be both closed or both opened, so that the voltage output by the charging pile is increased and then output to the battery.
2. The system of claim 1, wherein the control unit is further configured to close the bridge arm switch when the output voltage of the charging post is less than the charging voltage of the battery.
3. The system of claim 1, further comprising: a capacitor;
the first end of the capacitor is connected with the first output end of the charging pile; and the second end of the capacitor is connected with the second output end of the charging pile.
4. The system of claim 3, wherein the control unit is further configured to control the inverter to be turned on and off to pre-charge the capacitor with the battery.
5. The system of claim 1, further comprising: a clutch;
and the clutch is used for enabling a rotor of the motor to be disconnected from the electric shaft when the motor controller is connected with the charging pile and the bridge arm switch is disconnected.
6. The system of claim 1, further comprising: a parking device;
and the parking device is used for fixing a rotor of the motor when the motor controller is connected with the charging pile and the bridge arm switch is disconnected.
7. The system of claim 4, wherein the clutch of the electric vehicle is a single-phase clutch, and the motor controller is further configured to control the rotor of the motor to rotate to a horizontal position where the magnetic field direction of the rotor is at the same level as the magnetic field direction of the stator when the first switch is closed.
8. The system of claim 7, wherein the motor controller is specifically configured to: when the position of the rotor is in a first range, controlling the voltage of the rotor to be a preset voltage so as to enable the rotor of the motor to rotate to a position where the magnetic field direction of the rotor and the magnetic field direction of the stator are at the same horizontal position; and when the position of the rotor is in a second range, applying preset torque to the rotor so as to enable the rotor to rotate to a position corresponding to the first range.
9. An electric vehicle, comprising: the motor comprises a motor inductor, a motor controller and a bridge arm switch;
the motor controller comprises an inverter and a control unit; the inverter comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the first end of the first switch tube is connected with the first end of the bridge arm switch; the second end of the bridge arm switch is connected with the first end of the second switch tube; the first end of the second switching tube and the first end of the third switching tube are used for being connected with the first input end of the battery; the second end of the first switching tube is connected with the first end of the fourth switching tube; the second end of the second switch tube is connected with the first end of the fifth switch tube; the second end of the third switching tube is connected with the first end of the sixth switching tube; the second end of the fourth switching tube, the second end of the fifth switching tube and the second end of the sixth switching tube are used for connecting a second input end of the battery;
the first end of the motor inductor is connected with the second end of the first switching tube, the second end of the motor inductor is connected with the second end of the second switching tube, and the third end of the motor inductor is connected with the second end of the third switching tube;
the control unit is used for controlling the bridge arm switch and the fourth switching tube to be switched off, and the first switching tube is switched on; the control unit is further used for controlling the fifth switching tube and the sixth switching tube to be both closed or both opened, so that the voltage output by the charging pile is increased and then output to the battery.
10. The electric vehicle of claim 9, wherein the control unit is further configured to close the bridge arm switch when the output voltage of the charging post is less than the charging voltage of the battery.
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