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Chip for protecting battery and printed circuit board (PCB)

A chip and battery connection technology, applied in emergency protection circuit devices, battery circuit devices, current collectors, etc., can solve problems such as power waste, occupation of pin CS, and high resistance accuracy requirements.

Active Publication Date: 2014-03-12
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This method not only occupies the pin CS, but also the resistance on the current path directly affects the current control accuracy, so the resistance accuracy requirement is higher
The larger the value of the resistor, the higher the accuracy of the detected current signal, but at the same time it will also lead to greater power waste. To make up for the power waste caused by the resistor, the on-resistance of the power switch tube must be smaller, indirectly Increased product cost

Method used

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  • Chip for protecting battery and printed circuit board (PCB)
  • Chip for protecting battery and printed circuit board (PCB)
  • Chip for protecting battery and printed circuit board (PCB)

Examples

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Embodiment Construction

[0016] The inventors of the present application found that the schematic diagram of the inductor current waveform when the switch-type charger works in constant current charging is as follows: figure 2 shown. There is a formula Iavg=Ipeak-Iripple / 2=Ipeak-D*Toff / 2=Ipeak-Toff*Vbat / 2L, where Iavg is the average current, Ipeak is the peak current, Iripple is the current oscillation amplitude, and D is Upside Switch off (upper Switch cut-off) stage inductor current drop slope, Toff is Upside Switch off time (upside switch cut-off time), Vbat is battery voltage, L is inductance value. If Ipeak is determined, then if you want to obtain an average current Iavg that does not change with the battery voltage, you need Toff*Vbat to be a constant. Since Vbat will change with charging, to make Toff*Vbat constant, it is necessary to generate Toff which is inversely proportional to Vbat. In the embodiment of the present invention, a time control module connected with the switch control mod...

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Abstract

The invention discloses a chip for protecting a battery. The chip is used for providing stable current. The chip comprises a switching control module and a time control module, wherein the switching control module is used for controlling the switching-on or switching-off of a path between a power end and a battery connecting end; the time control module is connected with the switching control module, and is used for controlling the switching-off time of the path; and the switching-off time is inversely proportional to the voltage of the battery connecting end. The invention also discloses a printed circuit board (PCB) comprising the chip.

Description

technical field [0001] The invention relates to the field of electronic technology and embedded, in particular to a chip and a PCB for protecting batteries. Background technique [0002] As the power requirements of portable devices become larger and larger, the battery capacity is forced to increase to provide longer usage time to meet the demand. This requires shortening the charging time of these larger batteries, minimizing heat dissipation during charging, and improving conversion efficiency. heat dissipation problem. Switching chargers charge single or dual cell Li-ion batteries in cell phones, smartphones, tablets, wireless broadband hotspots, digital cameras, and portable media / game players, among other portable products. [0003] The structure of existing switch mode charger sees figure 1 shown. The switching charger needs to control the inductor current during the constant current charging process. To achieve this purpose, a resistor is connected in series on t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/18H02J7/00
Inventor 尹航王钊杨靖
Owner WUXI ZGMICRO ELECTRONICS CO LTD