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Lithium battery control circuit and lithium battery charger

A technology for controlling circuits and lithium batteries, applied to battery circuit devices, current collectors, circuit devices, etc., to achieve the effects of improving efficiency, preventing surge current and oscillation, and simple structure

Active Publication Date: 2018-07-20
WINBOND ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention proposes a lithium battery control circuit and a lithium battery charger to solve the problems mentioned in the prior art
Lithium battery control circuit includes smooth conversion circuit and off time control circuit

Method used

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  • Lithium battery control circuit and lithium battery charger
  • Lithium battery control circuit and lithium battery charger
  • Lithium battery control circuit and lithium battery charger

Examples

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Embodiment Construction

[0089] In the following embodiments, when an element is referred to as being “connected” or “coupled” to another element, it may be directly connected or coupled to the other element, or there may be intervening elements. The term "circuitry" may refer to at least one element or a plurality of elements, or elements that are actively and / or passively coupled together to provide a suitable function. It should be understood that throughout this specification and the drawings referenced to a signal, its physical characteristic may be a voltage or a current.

[0090] see image 3 . The lithium battery charger 300 can be used to charge the lithium battery 390 . The lithium battery charger 300 may include a lithium battery control circuit 310 , a current sensing circuit 350 , a feedback circuit 360 , a driving circuit 370 , and an output stage 380 . Hereinafter, "charging system" or "system" will refer to the overall circuit composed of the lithium battery charger 300 and the lith...

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Abstract

The invention relates to a lithium battery control circuit and a lithium battery charger including the lithium battery control circuit. The lithium battery control circuit comprises a smooth converting circuit and an OFF time control circuit. The smooth converting circuit generates a first voltage according to a current sensing signal and a feedback signal, and generates a second voltage accordingto a mode signal. The smooth converting circuit compares the first voltage with the second voltage to generate a resetting signal. The OFF time control circuit converts the feedback signal via a voltage to current mechanism to generate a first current, and a setting signal is generated by using the first current and a duty factor signal. Thus, the smooth converting circuit can prevent surge current and an oscillation phenomenon. The OFF time control circuit controls the switching frequency and ripple of the output current. A complex compensation circuit is not needed, the structure is simple,and the manufacture cost can be reduced.

Description

technical field [0001] The invention relates to a lithium battery charging technology, and in particular to a lithium battery control circuit and a lithium battery charger that can improve the efficiency of the overall charger. Background technique [0002] Figure 1A Is the equivalent circuit diagram of the existing lithium battery charging. For the actual lithium battery 100, its internal resistance Rbir is not a constant but a variable value. The reason is that the internal resistance Rbir changes under the influence of dependent temperature, charging current Ich, number of times of use, and the like. [0003] Figure 1B It is a schematic diagram of the correlation between the internal resistance and the current of the lithium battery. Regardless of charging or discharging, for a larger charging or discharging current, the internal resistance Rbir of the lithium battery will have a larger resistance value. [0004] Figure 1C It is a schematic diagram of the correlat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0077H02J7/0036
Inventor 洪崇智江俊彦
Owner WINBOND ELECTRONICS CORP
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