Over-current protection circuit

A technology of overcurrent protection circuit and input circuit, which is applied in the electronic field, can solve the problems of high cost and large volume, and achieve the effect of low cost and small volume

Inactive Publication Date: 2014-03-26
上海千大信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has certain advantages such as large volume and high cost.

Method used

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  • Over-current protection circuit

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Embodiment Construction

[0007] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0008] Such as figure 1 As shown, this embodiment provides an overcurrent protection circuit, including an input circuit, an output circuit, and an operational amplifier, the input circuit is connected to the negative input terminal of the operational amplifier; the operational amplifier includes a positive input terminal, a negative an inpu...

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PUM

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Abstract

The invention discloses an over-current protection circuit. The over-current protection circuit comprises an input circuit, an output circuit and an operation amplifier, wherein the input circuit is connected with a negative pole input end of the operation amplifier; the operation amplifier comprises a positive pole input end, the negative pole input end and an output end; the output circuit is connected with the positive pole input end of the operation amplifier. The over-current protection circuit provided by the invention has the advantages that the size is small, the cost is low, effective current protection can be provided for the power supply current of an LED (Light Emitting Diode), and the LED can be prevented from being damaged under the accidental conditions of load short circuit, overload or control circuit failure and the like.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an overcurrent protection circuit. Background technique [0002] In the LED power supply circuit in the prior art, when unexpected conditions such as load short circuit, overload, or control circuit failure occur, the current flowing through the LED will be too large, which will increase the power of the tube and generate heat, and the high-power light-emitting diode will be damaged. It may be damaged, such as the failure of the regulation circuit, and may also cause LED overcurrent damage. In the prior art, sampling resistors and Hall sensors are usually used for detection and comparison, so as to realize protection. However, this method has certain advantages such as large volume and high cost. Contents of the invention [0003] The object of the present invention is to provide an overcurrent protection circuit. [0004] The overcurrent protection circuit provided by...

Claims

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Application Information

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IPC IPC(8): H02H9/02
Inventor 不公告发明人
Owner 上海千大信息科技有限公司
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