Charger and over-current protection circuit thereof

A technology of overcurrent protection circuit and charger, which is applied in the direction of emergency protection circuit device, emergency protection circuit device for limiting overcurrent/overvoltage, circuit device, etc., and can solve the problem of high cost, slow response speed and complicated circuit structure and other problems, to achieve low cost, simple circuit structure, and solve the effect of complex circuit structure

Inactive Publication Date: 2014-07-02
SHENZHEN OCEANS KING LIGHTING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a charger overcurrent protection circuit, which aims to solve the problems of complex circuit structure, slow response speed and high cost in the prior art

Method used

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  • Charger and over-current protection circuit thereof
  • Charger and over-current protection circuit thereof

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Embodiment Construction

[0014] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0015] In the embodiment of the present invention, a charger overcurrent protection circuit including a sampling resistor R1, a reference voltage generation unit, a voltage comparison unit and a feedback control unit is used in the charger, the circuit structure is simple, the cost is low, and the output terminal of the charger When a short-circuit overcurrent occurs, the feedback voltage inside the Boost boost circuit of the charger can be quickly adjusted, so that the Boost boost circuit can adjust the output current of the charger according to the feedback voltage, and then the charger realizes o...

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Abstract

The invention is suitable for the field of charge control, and provides a charger and an over-current protection circuit thereof. The over-current protection circuit comprising a sampling resistor R1, a reference voltage generating unit, a voltage comparing unit and a feedback control unit is arranged in the charger, and the circuit is simple in structure and low in cost; when the short circuit over-current phenomenon occurs in the output end of the charger, feedback voltage in a Boost circuit of the charger can be adjusted rapidly so that the Boost circuit can adjust output currents of the charger according to the feedback voltage, therefore, over-current protection of the charger is achieved, and the charger is prevented from being damaged.

Description

technical field [0001] The invention belongs to the field of charging control, in particular to a charger and an overcurrent protection circuit thereof. Background technique [0002] At present, a charger as a power supply device has been widely used to charge various electronic products with storage batteries. When charging electronic products, if the output terminal of the charger is short-circuited due to various accidents, it will damage the internal circuit due to excessive loop current. [0003] Aiming at the problems existing when the above-mentioned charger is short-circuited, a solution provided by the prior art is to implement overcurrent protection for the charger by using a dedicated integrated IC. Although this solution achieves the purpose of protecting the charger, the dedicated integrated Corresponding peripheral circuits need to be configured, which complicates the internal circuit structure of the charger, reduces the response speed, and increases the cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
Inventor 周明杰管伟芳
Owner SHENZHEN OCEANS KING LIGHTING ENG CO LTD
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