Gain same-phase amplifying circuit based charging power supply for lithium ion battery

Abstract

The invention discloses a gain same-phase amplifying circuit based charging power supply for a lithium ion battery. The gain same-phase amplifying circuit based charging power supply is characterized by mainly consisting of a control chip U2, a diode rectifier U1, a transformer T, a thermistor RT, a polar capacitor C1, a resistor R1, a low-pass filtering circuit, a gain same-phase amplifying circuit, a thyristor voltage stabilizing circuit and a power regulator circuit, wherein the gain same-phase amplifying circuit is serially connected between the low-pass filtering circuit and a VDD pin of the control chip U2; the thyristor voltage stabilizing circuit is serially connected between the control chip U2 and a primary side of the transformer T; and the power regulator circuit is connected with a dotted terminal of a secondary-side inductance coil L4 of the transformer T and the control chip U2 respectively. The charging power supply can supply 4.2 V reference voltage required during charging for the lithium ion battery; meanwhile, constant current charging can be carried out on the lithium ion battery until the voltage is 4.2 V, and then constant voltage charging is carried out, so that stable charging voltage and current can be supplied for the lithium ion battery, and overcharging of the lithium ion battery is effectively prevented.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a charging power supply for a lithium ion battery based on a gain in-phase amplifier 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 output stable voltag...

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 charging power supply for lithium-ion batteries based on a gain in-phase amplifier circuit

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