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Electric car DC-DC converter with storage battery protection function

A technology for electric vehicles and protection functions, applied in electric vehicles, battery overcurrent protection, battery disconnection circuits, etc., can solve problems such as large output current, achieve safe and reliable charging, and ensure the effect of service life

Inactive Publication Date: 2016-03-23
ZHEJIANG XUHANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this will cause trouble in disassembling and assembling the battery, and when the battery is close to the undervoltage protection point, the output current of the DCDC converter at the moment of charging the battery will still be very large

Method used

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  • Electric car DC-DC converter with storage battery protection function
  • Electric car DC-DC converter with storage battery protection function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: As shown in the figure, an electric vehicle DCDC converter with battery protection function includes an EMI circuit module 1, an auxiliary power module 2, a diode 11, and a large current output for supplying power to the load 3 in the electric vehicle The EMI circuit module 1 is electrically connected to the power battery 13 in the electric vehicle, and the EMI circuit module 1 is electrically connected to the auxiliary power supply module 2. The large current output system includes the use of full bridge resonance. The first inverter circuit module 5, the first rectifier circuit module 6 using the synchronous current doubler rectification method, and the large current output control module 7. The large current output control module 7 is composed of an integrated chip of the model ISL6754 and peripheral circuits, and an EMI circuit The module 1, the first rectifier circuit module 6, and the large current output control module 7 are respectively electrically ...

Embodiment 2

[0017] Embodiment 2: As shown in the figure, the other structure is the same as that of Embodiment 1. The difference is that a fuse 12 is connected in series between the output negative electrode of the first rectifier circuit module 6 and the output negative electrode of the second rectifier circuit module 9.

[0018] In the second embodiment above, the working principle of the DCDC converter is: when the DCDC converter works, the output voltage of the large current output system and the output voltage of the low current output system are the same and output at the same time, and the diode 11 is forward-conducting and reverse-cutting And a little voltage drop is required when it is turned on. The second rectifier circuit module outputs current to charge the battery 4, and the small current output control module 10 can control the charging current to the battery 4 to ensure the safety of charging the battery 4. The forward conduction of 11 requires a voltage drop between the anode...

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PUM

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Abstract

The invention discloses an electric car DC-DC converter with a storage battery protection function. The converter is characterized by comprising an EMI circuit module, an auxiliary power module, a high current output system used for supplying power to a load in an electric car, and a low current output system used for charging a storage battery, wherein the EMI circuit module is electrically connected with the auxiliary power module; the high current output system and the low current output system are respectively connected with the EMI circuit module electrically; a diode is connected in series between the high current output system and the low current output system. The converter has the advantages that since the high current output system used for supplying power to the load in the electric car and the low current output system used for charging the storage battery are arranged in the DC-DC converter, the DC-DC converter is capable of safely and reliably charging the storage battery when sever voltage loss of the storage battery occurs and the normal power supply to the load of the electric car is not affected, thus ensuring the service life of the storage battery.

Description

Technical field [0001] The invention relates to a battery charging system in an electric vehicle, and in particular to a DCDC converter of an electric vehicle with a battery protection function. Background technique [0002] Electric vehicles are mainly powered by power batteries and accumulators. At present, people's attention to the charging safety of electric vehicles is more about the charging of power battery packs. However, safety accidents also occur when the batteries of electric vehicles are charged. Because the current on-board DCDC converters of electric vehicles are all regulated single-channel output, when the battery is seriously depleted (that is, the voltage at both ends of the battery is less than 8V), the instantaneous current of the DCDC converter charging the battery will be very large (more than its safe charging Current range), which will not only seriously shorten the service life of the battery, but also may cause safety accidents such as battery bulging a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02J7/00H02H7/18
CPCH02H7/18H02J7/00304H02J7/0031H02J7/0034H02J7/342H02M3/33561
Inventor 历华松杨晓东谢松林赵强先张函
Owner ZHEJIANG XUHANG NEW ENERGY TECH