CN114243814A - Intelligent vehicle-mounted charging device for electric vehicle storage battery - Google Patents

Intelligent vehicle-mounted charging device for electric vehicle storage battery Download PDF

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Publication number
CN114243814A
CN114243814A CN202111404236.8A CN202111404236A CN114243814A CN 114243814 A CN114243814 A CN 114243814A CN 202111404236 A CN202111404236 A CN 202111404236A CN 114243814 A CN114243814 A CN 114243814A
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China
Prior art keywords
voltage
storage battery
power supply
current
output
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Pending
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CN202111404236.8A
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Chinese (zh)
Inventor
彭焓
周斌
王志刚
唐维
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Jiangsu Zenergy Battery Technologies Co Ltd
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Suzhou Zhengli Core Control Electronics Co ltd
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Priority to CN202111404236.8A priority Critical patent/CN114243814A/en
Publication of CN114243814A publication Critical patent/CN114243814A/en
Pending legal-status Critical Current

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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
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage protection
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses an intelligent vehicle-mounted charging device for an electric vehicle storage battery, which is integrated in a battery pack, converts the voltage of a high-voltage power battery into low voltage, monitors the voltage of the storage battery in real time, and charges the storage battery at the low voltage. When the storage battery of the electric automobile is undervoltage due to overuse or long-term parking, the voltage output can be intelligently started to charge the storage battery and supply power to a vehicle-mounted low-voltage system without depending on devices such as a VCU, a vehicle-mounted DCDC converter, a high-voltage relay and the like. Even in the single battery pack state, the BMS in the battery pack can be powered by only providing a short wake-up power supply from the outside. The invention can replace the whole vehicle DCDC converter, perfectly solves the high risk of 'under-voltage' of the storage battery, and basically does not increase extra hardware cost. All functions of the whole vehicle DCDC converter can be replaced by matching with a certain software control strategy as long as the power and the installation space of the whole vehicle low-voltage electric appliance are allowed.

Description

Intelligent vehicle-mounted charging device for electric vehicle storage battery
Technical Field
The invention belongs to the field of new energy (electric) automobiles, and particularly relates to a control system and a control device for avoiding undervoltage or failure of a storage battery caused by long-term parking of an electric automobile or over-discharge of a low-voltage power supply.
Background
Most of the existing electric vehicles continue the battery charging scheme of the conventional fuel-oil vehicle, as shown in fig. 1, only the generator system of the fuel-oil vehicle is replaced by a direct current voltage converter (on-board DCDC) of the electric vehicle. When the vehicle runs, the vehicle-mounted DCDC can supply power for a low-voltage system of the whole vehicle and provide a part of current to charge a vehicle-mounted storage battery so as to maintain the normal working voltage of the storage battery. The prior art has the following disadvantages: when the vehicle does not start the high-voltage power system (the high-voltage power switch is not closed in fig. 1), the vehicle-mounted DCDC has no voltage source, and the storage battery has a power shortage risk, so that the vehicle cannot be started. Such as the following two cases: 1. because a series of low-voltage electric appliances such as a vehicle air conditioning system, a light control system, an instrument system, a BCM (body control module) and the like are directly powered by a vehicle-mounted storage battery, under the condition that the storage battery has no charging source, the storage battery is over-discharged and under-voltage inevitably caused by long-time discharging of human factors (such as opening an air conditioner in a vehicle, forgetting to turn off a headlamp and the like). 2. When the vehicle is parked, firstly, the storage battery has self-discharge property, secondly, low-voltage power utilization systems such as a VCU (whole vehicle control system) and a BMS (battery management system) can be intermittently and automatically awakened from a dormant state to monitor the vehicle, and the electric quantity of the storage battery can be consumed in the process. Therefore, if the vehicle is parked for too long, the on-board battery may be starved.
In response to the above-mentioned shortcomings of the prior art, manufacturers have proposed a low-voltage battery management system (refer to patent application No. 201920583692.5). The idea of the system is to wake up a vehicle control system and a battery management system through CAN communication, close a high-voltage switch and provide a high-voltage power supply for DCDC, wherein a schematic flow chart is shown in figure 3, and an electrical structure chart is shown in figure 2. Although the low-voltage battery management system overcomes the problems, the low-voltage battery management system has new defects: 1. the scheme involves more vehicle-mounted systems of the electric automobile, which means that the high-voltage battery needs to supply power to a plurality of vehicle-mounted systems simultaneously while charging the storage battery, and extra power loss except the storage battery is caused, such as power supply loss of VCU/BMS, conversion loss of DCDC, driving loss of a high-voltage power switch and the like. The efficiency of charging the storage battery by the high-voltage battery is greatly reduced, which is against the original purpose of maximizing the utilization of electric quantity. 2. The implementation of the above scheme needs to combine the VCU and the BMS to perform independent state judgment and logic operation for the requirement of "battery power shortage", for example, when the requirement is awakened, the operation of the power control related system needs to be prohibited (the starting power does not meet the functional safety requirement in an unexpected state), and the code development amount of each control system is additionally increased.
Disclosure of Invention
The invention aims to solve the problem of power shortage of an electric automobile storage battery and prolong the service life of the storage battery, and provides an intelligent vehicle-mounted charging device (named as LVCS) for the electric automobile storage battery. The intelligent charging system can be used as an independent system without depending on or influencing the working state of each large control system of the whole vehicle, automatically and intelligently start charging according to the state of the storage battery, and intelligently adjust the charging current.
The technical solution for realizing the purpose of the invention is as follows: the utility model provides an on-vehicle charging device of electric automobile battery intelligence, the device is integrated in electric automobile's battery package for convert high-pressure power battery voltage into low-voltage, and the voltage of real-time supervision battery when the voltage is less than and predetermines the threshold value, charges for the battery.
Further, the device instantly turns on the output when the voltage of the storage battery is lost to charge the storage battery.
Furthermore, the output voltage and the output current of the device are both adjustable.
Further, the power supply of the device is from the storage battery and the power conversion output of the storage battery, and the device can work normally when any power supply exists.
Further, the apparatus comprises:
the main controller is used as a main processor for controlling and monitoring the device;
the switching power supply controller comprises a switching power supply driving chip and a switching MOS;
the CAN communication circuit is used for realizing the communication between the main controller and the outside;
the input of the high-voltage input switch is connected with a high-voltage power battery, and the main controller controls the high-voltage power battery to be switched on and off through a digital isolator;
the EMI filter circuit is connected with the output of the high-voltage input switch and used for reducing the noise of the switching power supply so as to meet the EMC test standard;
the voltage comparator is used for detecting and comparing input voltage based on the voltage output by the EMI filter circuit, and disconnecting an enabling switch of the switching power supply controller when the voltage of the high-voltage power battery exceeds a set threshold value;
the current and voltage control unit is communicated with the main controller through the digital isolator, the main controller sets parameters of the current and voltage control unit, and different hardware compensation feedback is provided for the switching power supply controller by different parameters;
the ADC sampling unit is used for collecting voltage input at high voltage and consumed current, and sending the voltage and the consumed current to the main controller through the digital isolator for calculation to obtain the charge amount consumed by the high-voltage power battery; the current and voltage control unit is used for acquiring real-time temperature near the switching power supply controller, and when the temperature exceeds a set threshold value, the current and voltage control unit is used for reducing the output current of the switching power supply controller or controlling the high-voltage input switch to disconnect high-voltage input;
the primary side of the isolation transformer is controlled by the switching power supply controller, the secondary side 1 supplies power for the switching power supply controller at low voltage, and the secondary side 2 outputs alternating voltage;
the output rectifying circuit is used for rectifying the alternating-current voltage output by the secondary 2 of the isolation transformer to obtain direct-current voltage and outputting the direct-current voltage to the storage battery through the output switch; wherein, the output switch is controlled by the main controller to be opened and closed;
the sampling unit is used for collecting the real-time voltage of the storage battery and judging whether the storage battery needs to be charged; the charging device is used for collecting the output current of the charging device and judging whether the output current is consistent with the current set by the current and voltage control unit; the current and voltage control unit is used for controlling the high-voltage input switch to cut off the high-voltage input;
the power supply is used for supplying power to the main controller, the CAN communication circuit and the isolation power supply;
and the LDO unit is used for stabilizing the voltage output by the isolation power supply and then supplying power to the voltage comparator, the current and voltage control unit and the ADC sampling unit.
Compared with the prior art, the invention has the following remarkable advantages:
(1) the LVCS is a device that converts the voltage of a high voltage power battery to a low voltage, similar to a full vehicle DCDC converter. The power supply of the main control logic unit in the device is from the storage battery and the power conversion output of the storage battery, and the device can work normally when any power supply of the storage battery and the power conversion output of the main control logic unit exists.
(2) The LVCS is a device integrated in the battery pack, and has low voltage for the interfaces outside the battery pack and good electrical isolation characteristic.
(3) The LVCS can independently monitor the voltage of the storage battery, and other control systems of the whole vehicle, such as a VCU, a BMS, a DCDC converter, a high-voltage switch and the like, do not need to be awakened in the charging process. Meanwhile, the LVCS has the functions of electric quantity calculation and storage, and the electric quantity value of loss can be sent to the BMS for SOC calibration of the power battery after charging is completed. The BMS may also be awakened while beginning output to monitor the overall vehicle insulation and high voltage conditions.
(4) The LVCS output voltage is adjustable, and the output current is adjustable. Because the storage battery may be a lead-acid battery or a lithium battery, and the full-electricity voltage is different, when the automobile leaves a factory or after the storage battery is replaced, an engineer CAN set the output voltage of the LVCS through CAN communication.
(5) The LVCS can not only start output when the voltage of the storage battery is detected to be lower than a certain set threshold value, but also support instant start output when the voltage of the storage battery is lost, has high output response speed, and does not influence the normal work of low-voltage systems such as BMS, VCU and the like.
(6) The LVCS can charge the storage battery when the storage battery of the electric automobile is used excessively or is parked for a long time to cause undervoltage, and the intelligent voltage and current regulating system can create a proper electricity supplementing environment for the storage battery to prolong the service life of the storage battery.
(7) The LVCS can intelligently start voltage output, charge a storage battery and supply power for a vehicle-mounted low-voltage system without depending on devices such as a VCU (vehicle control system), a vehicle-mounted DCDC converter, a high-voltage relay and the like. Even in the single battery pack state, the BMS (battery management system) in the battery pack can be powered by only providing a short wake-up power supply from the outside.
(8) The LVCS can replace a DCDC converter of the whole vehicle, perfectly solves the high risk of 'under-voltage' of the storage battery, and basically does not increase extra hardware cost. All functions of the whole vehicle DCDC converter can be replaced as long as the power of the whole vehicle low-voltage electric appliance and the installation space of the invention allow and the invention is matched with a certain software control strategy.
(9) The LVCS is internally provided with a comparator, and a voltage threshold value can be set only based on a hardware circuit, so that overvoltage protection and undervoltage protection of high-voltage input are realized, and on one hand, an internal circuit of the device is protected from being burnt by overvoltage impact; on one hand, the high-voltage power battery is protected, and irreversible damage caused by overdischarge of the high-voltage power battery is avoided.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
Fig. 1 is an electrical configuration diagram of a battery charging scheme of a conventional fuel-powered vehicle.
Fig. 2 is an electrical block diagram of a prior art low voltage battery management system.
Fig. 3 is a schematic diagram of the operation of the low-voltage battery management system shown in fig. 2.
Fig. 4 is an electrical structural diagram of an intelligent vehicle-mounted charging device for an electric vehicle storage battery according to an embodiment of the invention.
Fig. 5 is a block diagram of an internal circuit structure of an intelligent vehicle-mounted charging device for an electric vehicle storage battery according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, in combination with fig. 1, the invention provides an intelligent vehicle-mounted charging device for an electric vehicle storage battery, which is integrated in a battery pack of an electric vehicle, and is used for converting a high-voltage power battery voltage into a low voltage, monitoring the voltage of the storage battery in real time, and charging the storage battery when the voltage is lower than a preset threshold value.
Further, in one embodiment, the device instantaneously turns on the output to charge the battery when the voltage of the battery is lost.
Further, in one embodiment, the output voltage and the output current of the device are adjustable.
Further, in one embodiment, the power source of the device is from the storage battery and its own power conversion output, and the device can work normally when either power source exists.
Further, in one embodiment, in combination with fig. 2, the apparatus comprises:
the main controller is used as a main processor for controlling and monitoring the device;
the switching power supply controller comprises a switching power supply driving chip and a switching MOS;
the CAN communication circuit is used for realizing the communication between the main controller and the outside;
illustratively, the device sends the consumed electric quantity value to the BMS through the CAN communication circuit for SOC calibration, and the external system CAN control the output voltage value and the maximum output current value of the device through the CAN communication circuit.
For example, after the automobile leaves the factory or the storage battery is replaced, the user CAN set the output voltage of the device through the CAN communication circuit.
The input of the high-voltage input switch is connected with a high-voltage power battery, and the main controller controls the high-voltage power battery to be switched on and off through a digital isolator;
the EMI filter circuit is connected with the output of the high-voltage input switch and used for reducing the noise of the switching power supply so as to meet the EMC test standard;
the voltage comparator is used for detecting and comparing input voltage based on the voltage output by the EMI filter circuit, and disconnecting an enabling switch of the switching power supply controller when the voltage of the high-voltage power battery exceeds a set threshold value;
the current and voltage control unit is communicated with the main controller through the digital isolator, the main controller sets parameters of the current and voltage control unit, and different hardware compensation feedback is provided for the switching power supply controller by different parameters;
the ADC sampling unit is used for collecting voltage input at high voltage and consumed current, and sending the voltage and the consumed current to the main controller through the digital isolator for calculation to obtain the charge amount consumed by the high-voltage power battery; the current and voltage control unit is used for acquiring real-time temperature near the switching power supply controller, and when the temperature exceeds a set threshold value, the current and voltage control unit is used for reducing the output current of the switching power supply controller or controlling the high-voltage input switch to disconnect high-voltage input;
the primary side of the isolation transformer is controlled by the switching power supply controller, the secondary side 1 supplies power for the switching power supply controller at low voltage, and the secondary side 2 outputs alternating voltage;
the output rectifying circuit is used for rectifying the alternating-current voltage output by the secondary 2 of the isolation transformer to obtain direct-current voltage and outputting the direct-current voltage to the storage battery through the output switch; wherein, the output switch is controlled by the main controller to be opened and closed;
the sampling unit is used for collecting the real-time voltage of the storage battery and judging whether the storage battery needs to be charged; the charging device is used for collecting the output current of the charging device and judging whether the output current is consistent with the current set by the current and voltage control unit; the current and voltage control unit is used for controlling the high-voltage input switch to cut off the high-voltage input;
the power supply is used for supplying power to the main controller, the CAN communication circuit and the isolation power supply;
and the LDO unit is used for stabilizing the voltage output by the isolation power supply and then supplying power to the voltage comparator, the current and voltage control unit and the ADC sampling unit.
Further preferably, in one of the embodiments, the switching power supply controller may be designed as a flyback switching power supply or a forward switching power supply or a half-bridge switching power supply.
The working principle of the device is as follows: the device is supplied with power by the storage battery, and simultaneously monitors the voltage of the storage battery in real time. When a main control unit in the device monitors that the power supply voltage is lower than a certain set threshold value, the main controller sends a control instruction to close the high-voltage input switch. And the voltage comparator of the high-voltage area can judge the voltage of the high-voltage power battery in real time, and if the voltage does not exceed the set threshold, the switching power supply controller starts to work after the high-voltage switch is closed. Meanwhile, the high-voltage area ADC sampling and the low-voltage area sampling are carried out simultaneously, and if one of voltage, current and temperature is abnormal, the main controller immediately sends an instruction to control the high-voltage input switch and the high-voltage output switch to be turned off simultaneously.
The device can calculate the real-time power through ADC sampling in the high-voltage area, and accumulate and store the real-time power as an electric quantity value. The CAN communication circuit is used for data interaction between the device and an external system, the device sends the consumed electric quantity value to the BMS through the CAN for SOC calibration, and the external system CAN control the output voltage value and the maximum output current value of the device through the CAN.
If the storage battery power supply is lost in the twinkling of an eye, the main controller can immediately send out the command of controlling the high-voltage switch to open when the 5V supply voltage to the main controller drops to 4.305V, and the device can immediately respond to the power supply output at the moment, replaces the storage battery to supply power for self low-voltage area, and can supply power for external low-voltage electrical equipment simultaneously.
In conclusion, the intelligent voltage and current regulating system can charge the storage battery when the storage battery of the electric automobile is undervoltage due to overuse or long-term parking, and can create a proper electricity supplementing environment for the storage battery, so that the service life of the storage battery is prolonged.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. The utility model provides an on-vehicle charging device of electric automobile battery intelligence which characterized in that, the device integration in electric automobile's battery package for convert high-pressure power battery voltage into low-voltage, and the voltage of real-time supervision battery, when the voltage is less than and predetermines the threshold value, charge for the battery.
2. The intelligent vehicle-mounted charging device for the storage battery of the electric vehicle as claimed in claim 1, wherein the device instantly turns on the output to charge the storage battery when the voltage of the storage battery is lost.
3. The intelligent vehicle-mounted charging device for the electric vehicle storage battery according to claim 1 or 2, wherein the output voltage and the output current of the device are adjustable.
4. The intelligent vehicle-mounted charging device for the electric vehicle storage battery is characterized in that the power supply of the device is from the storage battery and the power conversion output of the storage battery, and the device can work normally when any power supply exists.
5. The intelligent vehicle-mounted charging device for the electric vehicle storage battery according to claim 4, is characterized by comprising:
the main controller is used as a main processor for controlling and monitoring the device;
the switching power supply controller comprises a switching power supply driving chip and a switching MOS;
the CAN communication circuit is used for realizing the communication between the main controller and the outside;
the input of the high-voltage input switch is connected with a high-voltage power battery, and the main controller controls the high-voltage power battery to be switched on and off through a digital isolator;
the EMI filter circuit is connected with the output of the high-voltage input switch and used for reducing the noise of the switching power supply so as to meet the EMC test standard;
the voltage comparator is used for detecting and comparing input voltage based on the voltage output by the EMI filter circuit, and disconnecting an enabling switch of the switching power supply controller when the voltage of the high-voltage power battery exceeds a set threshold value;
the current and voltage control unit is communicated with the main controller through the digital isolator, the main controller sets parameters of the current and voltage control unit, and different hardware compensation feedback is provided for the switching power supply controller by different parameters;
the ADC sampling unit is used for collecting voltage input at high voltage and consumed current, and sending the voltage and the consumed current to the main controller through the digital isolator for calculation to obtain the charge amount consumed by the high-voltage power battery; the current and voltage control unit is used for acquiring real-time temperature near the switching power supply controller, and when the temperature exceeds a set threshold value, the current and voltage control unit is used for reducing the output current of the switching power supply controller or controlling the high-voltage input switch to disconnect high-voltage input;
the primary side of the isolation transformer is controlled by the switching power supply controller, the secondary side 1 supplies power for the switching power supply controller at low voltage, and the secondary side 2 outputs alternating voltage;
the output rectifying circuit is used for rectifying the alternating-current voltage output by the secondary 2 of the isolation transformer to obtain direct-current voltage and outputting the direct-current voltage to the storage battery through the output switch; wherein, the output switch is controlled by the main controller to be opened and closed;
the sampling unit is used for collecting the real-time voltage of the storage battery and judging whether the storage battery needs to be charged; the charging device is used for collecting the output current of the charging device and judging whether the output current is consistent with the current set by the current and voltage control unit; the current and voltage control unit is used for controlling the high-voltage input switch to cut off the high-voltage input;
the power supply is used for supplying power to the main controller, the CAN communication circuit and the isolation power supply;
and the LDO unit is used for stabilizing the voltage output by the isolation power supply and then supplying power to the voltage comparator, the current and voltage control unit and the ADC sampling unit.
6. The intelligent vehicle-mounted charging device for the storage battery of the electric vehicle as claimed in claim 5, wherein the switching power supply controller can be designed as a flyback switching power supply or a forward switching power supply or a half-bridge switching power supply.
7. The intelligent vehicle-mounted charging device for the storage battery of the electric vehicle as claimed in claim 5, wherein the CAN communication circuit is used for realizing communication between a main controller and the outside, and specifically comprises:
this device sends the electric quantity value of consumption to BMS through CAN communication circuit and is used for the SOC calibration, and the output voltage value and the maximum output current value of this device of external system accessible CAN communication circuit control.
8. The intelligent vehicle-mounted charging device for the electric vehicle storage battery according to claim 5, wherein after the automobile leaves the factory or the storage battery is replaced, a user CAN set the output voltage of the device through the CAN communication circuit.
CN202111404236.8A 2021-11-24 2021-11-24 Intelligent vehicle-mounted charging device for electric vehicle storage battery Pending CN114243814A (en)

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Application Number Priority Date Filing Date Title
CN202111404236.8A CN114243814A (en) 2021-11-24 2021-11-24 Intelligent vehicle-mounted charging device for electric vehicle storage battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111404236.8A CN114243814A (en) 2021-11-24 2021-11-24 Intelligent vehicle-mounted charging device for electric vehicle storage battery

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CN114243814A true CN114243814A (en) 2022-03-25

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