Starting current monitoring circuit based charging power supply for lithium ion battery
A lithium-ion battery and monitoring circuit technology, applied in the electronic field, can solve the problems of unstable output voltage and current, low output power, etc., and achieve the effects of increasing output power, preventing overcharging, and shortening charging time
Inactive Publication Date: 2016-09-28
CHENGDU JUHUICAI TECH
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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 the starting current monitoring circuit
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[0019] like figure 1 As shown, the present invention mainly consists of a control chip U2, a diode rectifier U1, a transformer T, a thermistor RT, a polar capacitor C1, a resistor R1, a starting current monitoring circuit, a low-pass filter circuit, a thyristor voltage stabilizing circuit, and a power adjustment circuit composition.
[0020] When connected, the thermistor RT is connected in series between the two input terminals of the diode rectifier U1. The anode of the polarity capacitor C1 is connected to the negative output terminal of the diode rectifier U1, and the negative terminal thereof is connected to the positive output terminal of the diode rectifier U1. The starting current monitoring circuit is connected with the power adjustment circuit. One end of the resistor R1 is connected to the negative pole of the polarity capacitor C1, and the other end is grounded. The low-pass filter circuit is connected in series between the positive output terminal of the diode ...
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The invention discloses a starting current monitoring circuit based charging power supply for a lithium ion battery. The starting current monitoring circuit based charging power supply is characterized by mainly comprising a control chip U2, a diode rectifier U1, a transformer T, a thermistor RT, a polar capacitor C1, a resistor R1, a low-pass filter circuit, a thyristor voltage-stabilizing circuit which is connected between the control chip U2 and the primary side of the transformer T in series, a power adjustment circuit which is connected with the dotted terminal of the secondary side inductive coil L4 of the transformer T and the control chip U2 separately, and the starting current monitoring circuit which is connected with the power adjustment circuit. The starting current monitoring circuit based charging power supply can supply 4.2V reference voltage which is required by the lithium ion battery for charging; meanwhile, the starting current monitoring circuit based charging power supply can perform constant-current charge on the lithium ion battery until the voltage of the lithium ion battery achieves 4.2V and then the constant-current charging mode is performed; and therefore, the starting current monitoring circuit based charging power supply can supply stable charging voltage and current to the lithium ion battery, and the overcharging of the lithium ion battery can be 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 starting current monitoring 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 vo...
Claims
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IPC IPC(8): H01M10/46H01M10/48H02J7/00H01M10/0525
CPCH01M10/0525H01M10/46H01M10/48H02J7/00Y02E60/10
Inventor 不公告发明人
Owner CHENGDU JUHUICAI TECH