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Current-limiting protection and short-circuit protection circuit with self-recovery function

A short-circuit protection circuit and current-limiting protection technology is applied in emergency protection circuit devices, output power conversion devices, electrical components, etc. The effect of miniaturization and simple circuit

Active Publication Date: 2014-07-02
NO 24 RES INST OF CETC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the above-mentioned problems of large number of traditional circuit components, complex circuits and inability to take into account the current limiting protection function, the present invention proposes a current limiting protection and short circuit protection circuit with self-recovery function, which can better solve the problem of current limiting protection and short circuit protection of switching power supply. problem, especially suitable for peak current control mode, and the circuit is simple and easy to use

Method used

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  • Current-limiting protection and short-circuit protection circuit with self-recovery function

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Embodiment Construction

[0030] The specific implementation manners of the present invention are not limited to the following description, and are now further described in conjunction with the accompanying drawings.

[0031]The block diagram of self-restoring current limiting protection and short circuit protection circuit of the present invention is as image 3 Shown, the circuit diagram of self-recovery current limiting protection and short circuit protection circuit of the present invention is as Figure 4 shown. It consists of a current detection circuit, a rectification circuit, a current pulse amplitude control circuit, a current spike shielding circuit, a comparison circuit, a level shift filter circuit, and a short circuit control circuit. Parts are the same and will not be repeated here. It works like this:

[0032] Figure 4 In, the current sampling transformer T 1 The primary of the power loop is connected in series, and the pulse current of the power loop is from the I of the current ...

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Abstract

The invention relates to a current-limiting protection and short-circuit protection circuit with a self-recovery function. The circuit comprises a current detection circuit, a rectifying circuit, a current pulse amplitude control circuit, a current peak shielding circuit, a comparison circuit, a level displacement filter circuit and a switch circuit. According to the circuit, current-limiting protection and short-circuit protection functions of a switch power supply can be achieved with only one comparator, one reference voltage, one N-type short-circuit switch and a few of passive elements, and accordingly the circuit is simple. On the premise that performance of the circuit is not reduced, compared with the occupied area of a conventional short-circuit protection circuit, the occupied area of the circuit is reduced by 60%. The circuit can be widely used for high-reliability switch power supply circuits in the field of spaceflight and aviation.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a current-limiting protection and short-circuit protection circuit with self-recovery functions. It is directly applied to the field of switching power supply with peak current control. Background technique [0002] At present, the switching power supply is widely used in various fields, and the reliability of the switching power supply is required to be higher and higher, and the volume is getting smaller and smaller. In order to ensure the stable and reliable operation of the switching power supply in different environments, it is necessary to design various protection functions. Among them, the current limiting protection function and the short circuit protection function are the functions that are given priority in the design. The switching power supply burns or damages the load due to the large internal power consumption. At present, the current limiting protection ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12H02M1/32
Inventor 尹华柴汉冬曾轶哲邹华昌
Owner NO 24 RES INST OF CETC
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