Lithium ion battery switch charging circuit
A lithium-ion battery, charging circuit technology, applied in battery circuit devices, circuit devices, current collectors, etc., can solve problems such as high power consumption, and achieve high efficiency and reliability.
Inactive Publication Date: 2013-12-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
The structure of the linear charging circuit is relatively simple and the cost is low, but its biggest disadvantage is the large power consumption
Method used
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[0020] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:
[0021] Such as figure 1 As shown, the present invention includes a switch network, an inductor L, a charging current sampling circuit, a charging current setting circuit, a charging current sampling signal amplifying circuit, a battery voltage sampling circuit, a battery voltage sampling signal amplifying circuit G, an I-V conversion resistor, and a first buffer 1. Second buffer 2. Compensation network, PWM comparator, logic control circuit. After the input voltage passes through the switch network and inductor, it enters the sampling resistor Rsns, the high potential terminal of the sampling resistor is connected to the charging current setting circuit, and the low potential terminal of the sampling resistor is connected to the negative input terminal of the charging current sampling signal amplifier circuit, charging The output terminal of the current setti...
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The invention relates to an electronic circuit technology, in particular to a lithium ion battery switch charging circuit which comprises a switch network, an inductor L, a charging current sampling circuit, a charging current arranging circuit, a charging current sampling signal amplifying circuit, a battery voltage sampling circuit, a battery voltage sampling signal amplifying circuit, a converting resistor, a first buffer, a second buffer, a compensation network, a PWM comparer and a logic control circuit. The input end of the switch network is connected with a power supply, the output end of the switch network is connected with one end of the inductor L, the other end of the inductor L is connected with the input end of the charging current sampling circuit, the output end of the charging current sampling circuit is connected with the input end of the battery voltage sampling circuit, and the output end of the battery voltage sampling circuit is connected with a positive electrode of a lithium ion battery. The lithium ion battery switch charging circuit has the advantages that efficiency and reliability are high, smooth switching from a constant current charging mode to a constant voltage charging mode can be achieved without a complex control structure or a BCD technology, and the lithium ion battery switch charging circuit is good.
Description
technical field [0001] The invention relates to electronic circuit technology, in particular to a lithium-ion battery switch charging circuit based on a constant current / constant voltage mode. Background technique [0002] Today, various portable products such as notebook computers, mobile phones, video cameras, personal digital assistant devices, etc., have become extremely popular. At the same time, these portable products also put forward many unique requirements for batteries: high energy density, able to provide sufficient energy for portable applications, light weight, small size, safe enough and able to deal with possible improper use, long cycle life, Small self-discharge and low cost in idle state. Lithium-ion batteries have become the battery of choice for handheld terminal devices in recent years due to their advantages such as small size, high energy density, no memory, high cycle life, high battery voltage and low self-discharge rate. [0003] At present, ther...
Claims
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IPC IPC(8): H02J7/00
Inventor 罗萍王新宇崔嘉杰彭宣霖廖鹏飞王磊万宵鹏包毅甄少伟
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA