CN106911173B - Intelligent low-voltage auxiliary power supply device and method and off-vehicle charger - Google Patents
Intelligent low-voltage auxiliary power supply device and method and off-vehicle charger Download PDFInfo
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- CN106911173B CN106911173B CN201510963831.3A CN201510963831A CN106911173B CN 106911173 B CN106911173 B CN 106911173B CN 201510963831 A CN201510963831 A CN 201510963831A CN 106911173 B CN106911173 B CN 106911173B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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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
- B60L53/60—Monitoring or controlling charging stations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The application discloses an intelligent low-voltage auxiliary power supply device, an intelligent low-voltage auxiliary power supply method and an off-vehicle charger, wherein the intelligent low-voltage auxiliary power supply device comprises an intelligent low-voltage auxiliary power supply and a power supply conversion module, wherein the intelligent low-voltage auxiliary power supply comprises a power supply conversion module and is used for converting an input alternating voltage into a direct voltage; the charger controller comprises a voltage setting module for setting the value of the direct current voltage output by the power conversion module and a communication module for receiving the communication signal of the vehicle controller in the electric vehicle. When the charger controller does not receive the communication signal of the vehicle controller, the output of the intelligent low-voltage auxiliary power supply is set to be different from the current direct-current voltage, and the charger controller re-detects whether the charger controller receives the communication signal of the vehicle controller or not, so that the charger controller can adaptively provide the direct-current voltage required by the vehicle controller in the motor car to be charged, and the motor car to be charged normally works.
Description
Technical Field
The application relates to the field of electric vehicle charging, in particular to an intelligent low-voltage auxiliary power supply device, an intelligent low-voltage auxiliary power supply method and an off-vehicle charger.
Background
As an energy-saving and environment-friendly green travel tool, electric vehicles are being advocated by more and more countries and regions. Electric vehicles are being selected by more and more users today because the power source used is electric energy rather than gasoline, and the price of gasoline is increasingly high.
In the prior art, when an off-board charger charges an electric vehicle, a low-voltage auxiliary direct current voltage is provided for a vehicle controller in the electric vehicle and used as working voltage of the off-board charger, the vehicle controller can work normally after receiving the low-voltage auxiliary direct current voltage so as to control devices related to charging in the electric vehicle, and therefore the off-board charger is guaranteed to charge the electric vehicle normally. Due to the different types of electric vehicles, the operating voltage (i.e., low-voltage auxiliary dc voltage) required by the vehicle controller therein is also different, for example, the voltage required by an electric passenger car is 12V, and the voltage required by an electric bus is 24V. The low-voltage auxiliary direct-current voltage provided by the off-board charging machine in the prior art is fixed, so that the same off-board charging machine can only charge one type of electric vehicle and cannot be used generally, for example, the off-board charging machine with the low-voltage auxiliary direct-current voltage of 12V can only charge the electric vehicle with the required voltage of 12V, such as the electric passenger vehicle, and cannot charge the electric vehicle with the required voltage of 24V, such as the electric bus.
The disadvantage of the non-vehicle-mounted charger in the prior art not only causes inconvenience in use and waste of resources, but also is a great problem which hinders development and popularization of the electric vehicle.
Disclosure of Invention
In order to solve the problems, the application provides an intelligent low-voltage auxiliary power supply device, an intelligent low-voltage auxiliary power supply method and an off-vehicle charger.
According to a first aspect of the present application, there is provided an intelligent low-voltage auxiliary power supply device in an off-board charger, comprising:
the intelligent low-voltage auxiliary power supply comprises a power supply conversion module, a control module and a control module, wherein the power supply conversion module is used for converting an input alternating voltage into a direct voltage so as to supply power to a vehicle controller in a motor car to be charged when an off-board charger is connected with the motor car to be charged;
the charger controller comprises a voltage setting module and a voltage control module, wherein the voltage setting module is used for setting the value of the direct-current voltage output by the power conversion module; the communication module is used for receiving the communication signal of the vehicle controller in the motor car to be charged, and when the communication signal is not received, the communication module sends a voltage switching signal to the voltage setting module so that the voltage setting module can re-detect whether the communication signal is received by the direct-current voltage communication module with the output of the power conversion module set to another value, and when the communication signal is received, the communication module does not send the voltage switching signal to the voltage setting module.
According to a second aspect of the present application, there is provided a method of intelligent low voltage auxiliary power in an off-board charger, the off-board charger comprising a charger controller and an intelligent low voltage auxiliary power supply, the method comprising the steps of:
the charger controller sets the value of the output direct-current voltage of the intelligent low-voltage auxiliary power supply, wherein the off-board charger is connected into an alternating-current power grid;
after the charger controller detects that the off-board charger is connected with the motor car to be charged, a circuit between the intelligent low-voltage auxiliary power supply and a vehicle controller in the motor car to be charged is conducted, so that the intelligent low-voltage auxiliary power supply supplies power to the vehicle controller;
the charger controller detects whether a communication signal of the vehicle controller is received within a preset time range; when the charger controller does not receive the communication signal of the vehicle controller in the motor car to be charged within the preset time range, setting the output of the intelligent low-voltage auxiliary power supply as direct-current voltage of another value, and detecting whether the charger controller receives the communication signal of the vehicle controller within the preset time range; and when the charger controller receives the communication signal, ending.
According to a third aspect of the present application, there is provided an off-board charger comprising:
the AC-DC conversion module is used for converting alternating current into direct current so as to charge a battery pack in a vehicle to be charged, which is connected with the off-board charger;
the intelligent low-voltage auxiliary power supply device.
The beneficial effects of the application are as follows:
according to the application, when the charger controller in the off-board charger does not receive the communication signal of the vehicle controller in the electric vehicle to be charged, the output of the intelligent low-voltage auxiliary power supply is set to be different from the current direct-current voltage, and the charger controller detects whether the charger controller receives the communication signal of the vehicle controller in the electric vehicle to be charged or not, so that the charger controller can adaptively provide the direct-current voltage required by the vehicle controller in the electric vehicle to be charged to enable the electric vehicle to work normally.
Drawings
Fig. 1 is a schematic circuit diagram of a charging plug and a charging socket according to an embodiment of the application;
FIG. 2 is a schematic diagram of an off-board charger and an electric vehicle according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an off-board charger and an electric vehicle according to another embodiment of the present application;
FIG. 4 is a schematic diagram of an off-board charger and an electric vehicle according to another embodiment of the present application;
fig. 5 is a flowchart of a method for intelligent low-voltage auxiliary power supply in an off-board charger according to an embodiment of the application.
Detailed Description
The application will be described in further detail below with reference to the drawings by means of specific embodiments.
When charging an electric vehicle, an off-board charger typically inserts a charging gun into a gun slot of the electric vehicle, and inserts a charging plug included in the charging gun into a charging socket included in the gun slot. Referring to fig. 1, a charging plug 10 of an off-board charger is related to each line in a charging socket 10' of an electric vehicle. Pins 1 and 2 in the charging plug 10 are charging power interfaces, the off-board charger outputs direct current through the pins 1 and 2 to charge a battery pack in the electric vehicle, and correspondingly, the battery pack receives the direct current through pins 1', 2' of the charging plug 10; the pins 4 and 5 of the charging plug 10 are communication interfaces, the pins 4' and 5' of the charging socket 10' are also communication interfaces, and the off-board charger and the electric vehicle communicate through the pins 4 and 5 and the pins 4' and 5', and in one embodiment, the communication standard is a CAN communication standard; the pins 6 and 7 of the charging plug 10 are charging connection confirmation interfaces, and the pins 4', 5' of the charging socket 10' are also charging connection confirmation interfaces; the pins 8 and 9 of the charging plug 10 are low-voltage auxiliary power supply interfaces, and the pins 8' and 9' of the charging socket 10' are low-voltage auxiliary power supply receiving interfaces.
After the off-board charger is connected to an alternating current power grid (such as a utility power grid), the off-board charger can provide a charging direct current through charging power interfaces (namely pins 1 and 2), and provide an auxiliary direct current with constant voltage through low-voltage auxiliary power supply interfaces (namely pins 8 and 9). When the charging plug 10 of the off-board charger is plugged into the charging socket 10 'of the electric vehicle, the off-board charger can detect whether the off-board charger is connected with the electric vehicle or not through the matching of the charging connection confirmation interfaces, namely the pins 6, 7, 6 and 7', and after the connection with the electric vehicle is confirmed, the off-board charger provides working voltage for a vehicle controller in the electric vehicle through the low-voltage auxiliary power supply interfaces, namely the pins 8 and 9', and the vehicle controller receives the working voltage through the low-voltage auxiliary power supply receiving interfaces, namely the pins 8 and 9'; the electric vehicle controller detects whether the working voltage obtained from the pins 8', 9' meets the required working voltage, and after confirming the working voltage, the electric vehicle controller communicates with the off-board charger through the communication interface, namely the pins 4', 5', 4 and 5; after the vehicle controller and the off-board charger complete communication docking, the off-board charger completes self-checking, and a charging device related to starting control provides direct current for charging a battery pack of the electric vehicle through charging power interface pins 1 and 2; meanwhile, the vehicle controller controls the related charging devices of the electric vehicle, such as a switch, to be conducted, so that the battery pack can receive direct current for charging through the pins 1', 2'; when the electric vehicle controller detects that the operating voltage obtained from the pins 8', 9' does not meet the operating voltage required by the electric vehicle controller, the electric vehicle controller cannot normally operate due to the fact that the operating voltage is not available, cannot communicate with the off-board charger through the communication interface, namely the pins 4', 5', 4 and 5, and cannot control the related charging devices of the electric vehicle, such as a switch, to be conducted, and therefore the battery pack cannot receive direct current for charging.
Therefore, the whole charging process can be normally performed only after the vehicle controller in the electric vehicle receives the working voltage meeting the requirements of the vehicle controller.
According to the intelligent low-voltage auxiliary power supply device, the intelligent low-voltage auxiliary power supply method and the non-vehicle-mounted charger, the characteristics that a vehicle controller in an electric vehicle can communicate with the non-vehicle-mounted charger through a communication interface after receiving the working voltage meeting the requirements of the vehicle controller, and the non-vehicle-mounted charger cannot communicate through the communication interface are utilized, the non-vehicle-mounted charger initially provides a low-voltage auxiliary voltage for the vehicle controller to serve as the working voltage, and if the working voltage can be received, the provided working voltage is the working voltage required by the vehicle controller; if the signal returned by the vehicle controller through the communication interface cannot be received, the provided working voltage is not in accordance with the requirement of the vehicle controller, the off-board charger can provide the low-voltage auxiliary voltage with another voltage value for the vehicle controller, and the voltage value of the low-voltage auxiliary voltage is not changed any more until the signal returned by the vehicle controller through the communication interface is received.
Embodiment one:
referring to fig. 2, the present embodiment proposes an off-board charger, which includes an AC-DC module 40 and an intelligent low-voltage auxiliary power device, which are described below.
The AC to DC module 40 is used to convert alternating current to direct current. In one embodiment, the AC to DC module 40 has an input terminal connected to the mains and an output terminal connected to pins 1, 2 of the charging plug 10.
The intelligent low-voltage auxiliary power supply device includes an intelligent low-voltage auxiliary power supply 20 and a charger controller 30. The following is a description with reference to fig. 2 and 3.
The intelligent low-voltage auxiliary power supply 20 comprises a power supply conversion module 21; the power conversion module 21 is used for converting an input ac voltage into a dc voltage to supply power to a vehicle controller 50 in an electric vehicle when an off-board charger is connected to the electric vehicle to be charged. In an embodiment, the input end of the power conversion module 21 is connected to the mains power grid, and the output end is connected to the low-voltage auxiliary power supply interface of the charging plug 10, namely the pins 8 and 9.
The charger controller 30 includes a voltage setting module 31 and a communication module 33, wherein the communication module 33 controls the voltage setting module 31 by transmitting a voltage switching signal to the voltage setting module 31, which will be described in detail below.
The voltage setting module 31 is used for setting the value of the dc voltage output from the power conversion module 21. In one embodiment, the voltage setting module 31 presets a voltage setting value of several levels from low to high, and the higher the level, the larger the value thereof; the voltage setting module 31 initially sets the dc voltage output from the power conversion module 21 to the lowest level of voltage setting value, so that when the operating voltages do not match, the vehicle controller 50 can be protected from damage of the vehicle controller 50 due to overvoltage. After the initialization, the voltage setting module 31 sets the dc voltage output from the power conversion module 21 to a voltage setting value one step higher than the current level when receiving the voltage switching signal transmitted from the communication module 33. In an embodiment, when the voltage setting module 31 sets the dc voltage output by the power conversion module 21 from the voltage setting value of the current level to the voltage setting value of the one level higher, the dc voltage output by the power conversion module 21 may be gradually increased from the voltage setting value of the current level to the voltage setting value of the one level higher, or the dc voltage output by the power conversion module 21 may be further increased from the voltage setting value of the current level to the voltage setting value of the one level higher; the former is a voltage set value gradually increased to a higher level, and the latter is a voltage set value instantaneously increased to a higher level, so that the former is safer to do and protects the vehicle controller 50, and the latter is faster to do. In one embodiment, the voltage setting module 31 is preset with a first level of voltage settings having a value of 12V and a second level of voltage settings having a value of 24V.
The communication module 33 is configured to receive a communication signal of the vehicle controller 50, and when the communication module 33 does not receive the communication signal sent by the vehicle controller 50, the communication module 33 sends a voltage switching signal to the voltage setting module 31, so that the voltage setting module 31 sets the output of the power conversion module 21 to a dc voltage with another value, and the communication module 33 re-detects whether it receives the communication signal sent by the vehicle controller 50; the communication module 33 does not transmit the voltage switching signal to the voltage setting module 21 when receiving the communication signal transmitted from the vehicle controller 50, and thus the output voltage of the voltage setting module 21 is stabilized at the current output voltage value. In one embodiment, the communication module 33 receives the communication signals sent by the vehicle controller 50 through the communication interfaces of the charging socket, i.e., the pins 4', 5', through the communication interfaces of the charging plug 10, i.e., the pins 4, 5.
In addition, in an embodiment, the voltage setting module 31 is further provided with a plurality of standard voltage values, when the communication module 33 receives the communication signal, the voltage setting module 31 sends a voltage self-checking signal to the voltage setting module 31, and after the voltage setting module 31 receives the voltage self-checking signal, it is detected whether the currently set voltage value is a standard voltage value, if not, the voltage setting module 31 sets the output voltage of the power conversion module 21 to be continuously increased until a certain standard voltage value. For example, the voltage setting values of several levels from low to high preset by the voltage setting module 31 are 12V, 18V, and 24V, respectively. The standard voltages of the current vehicle controller 50 are 12V and 24V, and the voltage setting module 31 also sets a standard voltage value of 24V. The vehicle controller 50 having a standard voltage of 24V may actually operate at 18V, but the state is unstable. Because, to ensure a device case, it is preferable to operate at standard voltages. This problem can be solved when the voltage setting module 31 is also provided with several standard voltage values. For example, when the voltage setting module 31 sets the power conversion module 21 to 18V, the communication module 33 may receive the communication signal sent by the vehicle controller 50, and at this time, the voltage setting module 31 may further detect whether the currently set voltage value is a standard voltage value, and is currently 18V, and is not the standard voltage value, so the voltage setting module 31 may set the output voltage of the power conversion module 21 to be continuously increased until the output voltage is the standard voltage value of 24V.
The following describes the operation of the off-board charger and the intelligent low-voltage auxiliary power unit of the present embodiment.
Before the electric vehicle is charged, the self-detection of the non-vehicle-mounted charger needs to be completed: when the off-board charger is connected to the ac power grid, the charger controller 30 sets the intelligent low-voltage auxiliary power supply 20 to a lower dc voltage, specifically, sets the dc voltage output by the power conversion module 21 to a voltage setting value of the lowest level through the voltage setting module 31. When the charging gun of the off-board charger is connected to the electric vehicle, the off-board charger and the electric vehicle are electrically connected through the matching of the charging plug 10 and the charging socket 10'. The charger controller 30 receives a signal through the charging connection confirmation interface and detects whether it is connected with the electric vehicle. After the connection of the two is completed, the vehicle controller 50 obtains the dc voltage output by the power conversion module 21 through the low-voltage auxiliary power receiving interface. The vehicle controller 50 detects whether the voltage of the low-voltage auxiliary power supply receiving interface meets the requirement of the vehicle controller, after the voltage meets the requirement, the vehicle controller starts to communicate with the charger controller 30 through the communication interface, and after the communication module 33 in the charger controller 30 receives a signal sent by the vehicle controller 50 through the communication interface, the self-test of the non-vehicle charger is finished; if the voltage switching signal is received by the voltage setting module 31, the output of the power conversion module 21 is set to a dc voltage of another value, for example, the dc voltage output by the power conversion module 21 can be set to a voltage setting value of a higher level from the voltage setting value of the current level, at this time, the vehicle controller 50 again detects whether the voltage of the low-voltage auxiliary power consumption receiving interface meets the requirement of itself, if the voltage of the low-voltage auxiliary power consumption receiving interface meets the requirement, the communication module 33 can receive a signal from the communication interface, and thus the self-detection of the non-vehicle-mounted charger is finished, if the detection result of the vehicle controller 50 does not meet the working voltage requirement of itself, the communication module 33 can not receive a signal from the communication interface, and thus the voltage switching signal can be sent to the voltage setting module 31, and the voltage switching module 21 can be set to a voltage setting value of a higher level from the current level, and the vehicle-mounted charger can set the voltage of the low-voltage auxiliary power consumption receiving interface to a non-charging level from the current level.
It should be noted that, in an embodiment, the charger controller 30 is a control module of the off-board charger, and is responsible for controlling the AC-to-DC module 40 inside the off-board charger and other conventional functions in the prior art, which will not be described herein. The vehicle controller 50 is a control module of the electric vehicle, and is responsible for controlling devices related to charging in the electric vehicle, for example, when the vehicle controller 50 confirms that the required operating voltage is received, the second switch module K2 is turned on, so that the battery pack 60 can obtain the direct current provided by the AC-DC conversion module 40 for charging, and the battery pack 60 is a battery component of the electric vehicle and a support force storage unit of the electric vehicle.
Example two
The intelligent low-voltage auxiliary power supply device and the off-board charger provided in the embodiment are improved on the basis of the first embodiment, and are specifically described below.
Referring to fig. 4, in this embodiment, the intelligent low-voltage auxiliary power device further includes a first switch module K1, where the first switch module K1 is configured to switch on and off the electrical connection between the power conversion module 21 and the vehicle controller 50 when the off-board charger is connected to the electric vehicle, and the first switch module K1 may be integrated in the intelligent low-voltage auxiliary power 20. Correspondingly, the battery charger controller further comprises a switch control module 35 for controlling the on and off of the first switch module K1. In one embodiment, the switch module K1 is turned on when the charger controller 30 detects that it is connected to the electric vehicle.
In one embodiment, the intelligent low voltage auxiliary power supply 20 further includes a current feedback module 23 for detecting the input or output current of the power conversion module 21 and transmitting a feedback signal. In one embodiment, the feedback signal includes information about the output current of the power conversion module 21. Accordingly, the battery charger controller 30 further includes an abnormality determination module 37 for determining a state of the vehicle controller 50 connected to the power conversion module 21 according to the feedback signal sent from the current feedback module 23, and sending a signal to the switch control module 35 to cause the switch control module 35 to control the first switch module K1 to be turned off when the vehicle controller 50 is determined to be in an abnormal state. In one embodiment, the abnormal state is a short-circuit abnormality, i.e., the vehicle controller 50 has a short-circuit.
In an embodiment, the charger controller 30 further includes a time monitoring module 39, which presets a time range, and when it is monitored that the communication module 33 does not receive the communication signal from the communication interface within the preset time range, the communication module 33 is notified to send the voltage switching signal to the voltage setting module 31.
Example III
The present embodiment proposes a method for intelligent low-voltage auxiliary power supply in an off-board charger, wherein the off-board charger includes a charger controller 30 and an intelligent low-voltage auxiliary power supply 20.
Referring to fig. 5, the method includes the following steps:
in step S11, the charger controller 30 sets a value of the output dc voltage of the intelligent low-voltage auxiliary power supply 20, where the off-board charger is connected to the ac power grid. In one embodiment, the charger controller 30 presets a voltage setting value of several levels from low to high, and the higher the level, the larger the value thereof; the charger controller 30 initially sets the dc voltage output from the intelligent low-voltage auxiliary power supply 20 to a voltage set value of the lowest level, and sets the dc voltage output from the intelligent low-voltage auxiliary power supply 20 to a voltage set value one level higher than the current level when the communication signal transmitted from the vehicle controller 50 is not received; when the charger controller 30 sets the dc voltage output from the intelligent low-voltage auxiliary power supply 21 from the current level voltage set value to the voltage set value of one level higher, the dc voltage output from the intelligent low-voltage auxiliary power supply 20 is gradually increased from the current level voltage set value to the voltage set value of one level higher, or the dc voltage output from the power conversion module 20 is gradually increased from the current level voltage set value to the voltage set value of one level higher. In one embodiment, the charger controller 30 presets a first level of voltage setting of 12V and a second level of voltage setting of 24V.
In step S13, after the charger controller 30 detects that the off-board charger is connected to the electric vehicle, the circuit between the intelligent low-voltage auxiliary power supply 20 and the vehicle controller 50 of the electric vehicle is turned on, so that the intelligent low-voltage auxiliary power supply 20 supplies power to the vehicle controller 50.
Step S15, the charger controller 30 detects whether a communication signal of the vehicle controller 50 is received within a preset time range; when the charger controller 30 does not receive the communication signal of the vehicle controller 50 within a preset time range, step S17 is performed; when the charger controller 30 receives the communication signal transmitted from the vehicle controller 50, it proceeds to step S19.
Step S17, the output of the intelligent low-voltage auxiliary power supply 20 is set to another value dc voltage, and step S15 is repeated. In an embodiment, initially, the charger controller 30 calculates from the time when the charger controller 30 turns on the circuit between the intelligent low-voltage auxiliary power supply 20 and the vehicle controller 50 of the electric vehicle, whether the communication signal sent by the vehicle controller 50 is received within the preset time range, and when the charger controller 30 sets the output of the intelligent low-voltage auxiliary power supply 20 to another value of dc voltage, it is calculated again from this time, and whether the charger controller 30 receives the communication signal of the vehicle controller 50 within the preset time range is detected.
Step S19, ends. At this time, the current output of the intelligent low-voltage auxiliary power supply 20 is not changed by the charger controller 30, so that the output of the intelligent low-voltage auxiliary power supply 20 is stabilized at the current voltage value.
In an embodiment, the method of this embodiment further comprises the steps of: the charger controller 30 detects the input or output current of the intelligent low-voltage auxiliary power supply 20 to determine the state of the vehicle controller 50 electrically connected to the intelligent low-voltage auxiliary power supply, and disconnects the electrical connection between the intelligent low-voltage auxiliary power supply 20 and the vehicle controller 50 when the vehicle controller 50 is determined to be in an abnormal state. In one embodiment, the abnormal state is a short-circuit abnormality, i.e., the vehicle controller 50 has a short-circuit.
In an embodiment, the method of this embodiment further comprises the steps of: the charger controller 30 is further provided with a plurality of standard voltage values, and detects whether the currently set voltage value is a standard voltage value after receiving the communication signal sent by the vehicle controller 50, if not, the intelligent low-voltage auxiliary power supply output voltage is set to be continuously increased until a certain standard voltage is reached.
The foregoing is a further detailed description of the application in connection with specific embodiments, and it is not intended that the application be limited to such description. It will be apparent to those skilled in the art that several simple deductions or substitutions can be made without departing from the inventive concept.
Claims (10)
1. An intelligent low-voltage auxiliary power supply device is arranged in an off-board charger and is characterized by comprising:
the intelligent low-voltage auxiliary power supply comprises a power supply conversion module, a control module and a control module, wherein the power supply conversion module is used for converting an input alternating voltage into a direct voltage so as to supply power to a vehicle controller in a motor car to be charged when an off-board charger is connected with the motor car to be charged;
the charger controller comprises a voltage setting module and a voltage control module, wherein the voltage setting module is used for setting the value of the direct-current voltage output by the power conversion module; the communication module is used for receiving the communication signal of the vehicle controller in the motor vehicle to be charged, and when the communication signal is not received, the communication module sends a voltage switching signal to the voltage setting module so that the voltage setting module sets the output of the power conversion module as direct current voltage with another value, and the communication module detects whether the communication signal is received again; and when the communication module receives the communication signal, the voltage switching signal is not sent to the voltage setting module.
2. The intelligent low-voltage auxiliary power supply apparatus according to claim 1, wherein the voltage setting module presets a voltage setting value of several levels from low to high, the higher the level is, the larger the value is; the voltage setting module is used for setting the direct current voltage output by the power conversion module to be a voltage setting value of the lowest level at first, and setting the direct current voltage output by the power conversion module to be a voltage setting value which is one level higher than the current level when the voltage switching signal is received; when the voltage setting module sets the direct current voltage output by the power conversion module from the voltage setting value of the current grade to the voltage setting value of the first grade, the direct current voltage output by the power conversion module is gradually increased from the voltage setting value of the current grade to the voltage setting value of the first grade, or the direct current voltage output by the power conversion module is increased from the voltage setting value of the current grade to the voltage setting value of the first grade.
3. The intelligent low-voltage auxiliary power supply apparatus according to claim 1 or 2, characterized in that:
the intelligent low-voltage auxiliary power supply device further comprises a first switch module, wherein the first switch module is used for switching on and off the electric connection between the power supply conversion module and the vehicle controller when the off-board charger is connected with the motor vehicle to be charged; the charger controller also comprises a switch control module for controlling the on-off of the first switch module;
the intelligent low-voltage auxiliary power supply also comprises a current feedback module, a power supply conversion module and a control module, wherein the current feedback module is used for detecting the input or output current of the power supply conversion module and sending a feedback signal;
the battery charger controller also comprises an abnormality judging module which is used for judging the state of the vehicle controller connected with the power supply conversion module according to the feedback signal, and sending a signal to the switch control module when the vehicle controller is judged to be in an abnormal state so as to enable the switch control module to control the first switch module to be disconnected.
4. The intelligent low-voltage auxiliary power supply apparatus according to claim 2, wherein: the voltage setting module is further provided with a plurality of standard voltage values, after the communication module receives the communication signal, the voltage setting module sends a voltage self-checking signal to the voltage setting module, after the voltage setting module receives the voltage self-checking signal, whether the currently set voltage value is a standard voltage value is detected, if not, the voltage setting module sets the output voltage of the power conversion module to be continuously increased until a certain standard voltage value.
5. The intelligent low-voltage auxiliary power supply device according to claim 1, wherein the charger controller further comprises a time monitoring module, wherein the time monitoring module is preset with a time range, and when the communication module is monitored that the communication signal is not received within the time range, the communication module is informed to send the voltage switching signal.
6. A method of intelligent low voltage auxiliary power in an off-board charger, the off-board charger comprising a charger controller and an intelligent low voltage auxiliary power, the method comprising the steps of:
the charger controller sets the value of the output direct-current voltage of the intelligent low-voltage auxiliary power supply, wherein the off-board charger is connected into an alternating-current power grid;
after the charger controller detects that the off-board charger is connected with the motor car to be charged, a circuit between the intelligent low-voltage auxiliary power supply and a vehicle controller in the motor car to be charged is conducted, so that the intelligent low-voltage auxiliary power supply supplies power to the vehicle controller;
the charger controller detects whether a communication signal of the vehicle controller is received within a preset time range; when the charger controller does not receive the communication signal of the vehicle controller in the motor car to be charged within the preset time range, setting the output of the intelligent low-voltage auxiliary power supply as direct-current voltage of another value, and detecting whether the charger controller receives the communication signal of the vehicle controller within the preset time range; and when the charger controller receives the communication signal, ending.
7. The method of intelligent low-voltage auxiliary power supply according to claim 6, wherein the charger controller is preset with voltage setting values of a plurality of grades from low to high, and the higher the grade is, the larger the voltage setting value is; the charger controller sets the direct current voltage output by the intelligent low-voltage auxiliary power supply to be the voltage set value of the lowest level at the beginning, and sets the direct current voltage output by the intelligent low-voltage auxiliary power supply to be the voltage set value which is one level higher than the current level when the communication signal is not received; when the direct current voltage output by the intelligent low-voltage auxiliary power supply is set to be one-level higher from the voltage set value of the current level, the charger controller gradually increases the direct current voltage output by the intelligent low-voltage auxiliary power supply from the voltage set value of the current level to the voltage set value of the one-level higher, or increases the direct current voltage output by the power supply conversion module from the voltage set value of the current level to the voltage set value of the one-level higher.
8. The method of intelligent low voltage auxiliary power supply according to claim 6 or 7, further comprising the steps of:
and the charger controller detects the input or output current of the intelligent low-voltage auxiliary power supply to judge the state of the vehicle controller electrically connected with the intelligent low-voltage auxiliary power supply, and when the vehicle controller is judged to be in an abnormal state, the electric connection between the intelligent low-voltage auxiliary power supply and the vehicle controller is disconnected.
9. The method of claim 7, wherein the charger controller is further provided with a plurality of standard voltage values, and further detects whether the currently set voltage value is a standard voltage value after receiving the communication signal, and if not, the output voltage of the intelligent low-voltage auxiliary power supply is set to be continuously increased until a certain standard voltage.
10. The off-board charger comprises an AC-DC module, a DC-DC conversion module and a battery pack, wherein the AC-DC conversion module is used for converting alternating current into direct current so as to charge a battery pack in a to-be-charged vehicle connected with the off-board charger; the intelligent low-voltage auxiliary power supply device according to any one of claims 1 to 5.
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| CN109327053A (en) * | 2018-07-26 | 2019-02-12 | 深圳市科华恒盛科技有限公司 | A kind of non-on-board charger and its control method |
| CN109774528B (en) * | 2018-12-25 | 2021-06-18 | 国网电力科学研究院有限公司 | Electric vehicle DC charging control guide circuit and control method |
| CN113162414B (en) * | 2021-05-06 | 2022-12-20 | 天津大学 | Base unit for electric energy converter, electric energy converter and universal power interface |
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