Constant voltage control and constant current control seamlessly switching method in charging power source and device thereof

A charging power supply, constant voltage control technology, applied in battery circuit devices, circuit devices, transportation and packaging, etc., can solve problems such as charging voltage or current jumps, frequent switching, oscillations, etc., to ensure stability, avoid oscillations, The effect of smooth and seamless transition

Inactive Publication Date: 2012-10-17
BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, on the one hand, when switching between constant voltage control and constant current control, the method directly jumps from the constant voltage control result to the constant current control result, or directly jumps from the constant current control result to the constant voltage control result, It is a hard switching process, not a smooth transition process, which will cause the charging voltage or current to jump
On the other hand, when the load state of the charging power supply is at the switching critical point, there will be frequent switching between constant voltage control and constant current control, and in severe cases, oscillation will occur, which will affect the charging effect and life of the battery

Method used

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  • Constant voltage control and constant current control seamlessly switching method in charging power source and device thereof
  • Constant voltage control and constant current control seamlessly switching method in charging power source and device thereof
  • Constant voltage control and constant current control seamlessly switching method in charging power source and device thereof

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Effect test

Embodiment 1

[0042] Such as figure 1 As shown, a flow chart of a seamless switching method between constant voltage control and constant current control in a charging power supply, step S1, the voltage and current detection module 301 detects the current charging power supply voltage and current values, and converts the values ​​to the charging power supply voltage The sum and current values ​​are transmitted to the weighting coefficient control module 303. Step S2, the current charging state judging subunit module 401 of the weighting coefficient control module 303 judges the current charging state of the charging power source according to the received current voltage and current values. Step S3, a weighting coefficient calculation subunit module 402 of the weighting coefficient control module 303 extracts the value m(t-1) and n(t-1) and n(t-1) of the voltage weighting coefficient m and the current weighting coefficient n from the storage module 302 1) and the variation Δm and Δn of each...

Embodiment 2

[0053] Such as figure 2 A seamless switching device for constant voltage control and constant current control in a charging power supply shown, including:

[0054] The constant voltage control unit 201 is used for constant voltage control; the constant current control unit 202 is used for constant current control; the constant voltage control unit 201 and the constant current control unit 202 respectively output constant voltage control to the switching synthesis control unit 203 results and constant current control results;

[0055] The switching synthesis control unit 203 includes: a voltage and current detection module 301, a weighting coefficient control module 303, a storage module 302 and a switching synthesis calculation module 304, wherein the voltage and current detection module 301 is used to detect the current voltage and current value, and transmit the current voltage and current values ​​to the weighting coefficient control module 303; the storage module 302 is ...

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Abstract

The invention relates to a constant voltage control and constant current control seamlessly switching method in a charging power source and a device thereof. A switching combination control unit is added in the control of the charging power source, the switching combination control unit comprises a voltage and current detecting module, a weighting coefficient control module, a memory module and a switching combination calculation module. The current charging state is judged by the weighting coefficient control module according to the numerical values of current voltage and current detected by the voltage and current detecting module, the weighting coefficient of the voltage and the current is calculated to obtain a switching combination result, and the switching combination result is used for producing driving pulse which is used for driving a power switch element of the charging power source. The proportion of the voltage and the current in the switching combination result is controlled by controlling the numerical value of the weighting coefficient, the change between the constant voltage and the constant current is slow, the smooth seamless transition of the switching process can be realized, and the oscillating phenomenon can be completely avoided so as to guarantee the stability of the charging process.

Description

technical field [0001] The invention relates to a digitally controlled charging power source, in particular to a seamless switching method between constant voltage control and constant current control in a digitally controlled charging power source. Background technique [0002] The battery charging power supply requires precise constant voltage control and constant current control, but switching between the constant voltage control state and the constant current control state is a problem that has not been well resolved. Wu Jin, Huang Jingsheng, Xie Linghan, Le Zhongming, and Chen Sitao published an article "Design of a Lithium-ion Battery Linear Charging Control System" in the fifth issue of "Electronic Devices" in 2008. A method to automatically switch between controls. The process of this method is to first detect the battery voltage range after power-on, when the battery voltage is less than 2.9V, use trickle charging, otherwise start constant current charging. During...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 谢孟施晓勇
Owner BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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