Low-pass filter circuit-based pulse current-limiting charging power supply for lithium-ion battery

Abstract

The invention discloses a pulse current-limiting lithium-ion battery charging power supply based on a low-pass filter circuit, which is characterized in that it mainly consists of a control chip U2, a diode rectifier U1, a transformer T, a thermistor RT, and a polar capacitor C1. Resistor R1, a low-pass filter circuit, a thyristor voltage regulator circuit, a gain in-phase amplifier circuit connected in series between the low-pass filter circuit and the VDD pin of the control chip U2, respectively connected to the terminal of the same name and the control terminal of the inductance coil L4 on the secondary side of the transformer T It consists of a power adjustment circuit connected to the chip U2, and a pulse current limiting circuit connected in series between the power adjustment circuit and the control chip U2. The present invention can provide the 4.2V reference voltage required for charging the lithium-ion battery; at the same time, the present invention can charge the lithium-ion battery with a constant current to 4.2V and switch to constant voltage charging, so that the present invention can provide a stable voltage for the lithium-ion battery. The charging voltage and current can effectively prevent the lithium-ion battery from being overcharged.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a charging power supply for a pulse current-limiting lithium-ion battery based on a low-pass filter circuit. Background technique [0002] At present, lithium-ion batteries are widely used in portable electronic devices such as mobile phones, camcorders, notebook computers, cordless phones, power tools, remote control or electric toys, and cameras due to their excellent characteristics. However, the output voltage and current of the existing lithium-ion battery charging power supply are unstable, which leads to overcharging of the lithium-ion battery and shortens the service life of the lithium-ion battery. At the same time, the existing lithium-ion battery charging power supply still has the problem of low output power, which leads to a long charging time of the lithium-ion battery. [0003] Therefore, it is urgent to provide a lithium-ion battery charging power supply that can outpu...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of unstable output voltage and current and low output power in the charging power supply for lithium-ion batteries in the prior art, and provide a pulse current-limiting lithium-ion battery based on a low-pass filter circuit. Charger

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