Over-current protection circuit of intrinsically safe power supply

An overcurrent protection circuit, intrinsically safe power supply technology, applied in emergency protection circuit devices, protections that respond to overcurrents, circuit devices, etc. Achieving the effect of wide practicability and simple structure

Inactive Publication Date: 2012-12-26
张望
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of the cut-off overcurrent protection circuit is relatively complicated, and it is not easy to automatically recover after the fault is eliminated.

Method used

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  • Over-current protection circuit of intrinsically safe power supply

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Embodiment Construction

[0010] An embodiment of the present invention will be further described in conjunction with the accompanying drawings.

[0011] Such as figure 1 As shown, the present invention is composed of a detection circuit 1 and a drive circuit 2 connected.

[0012] Detection circuit 1 is composed of detection resistor R1, pull-down resistor R2, current limiting resistor R3, triode Q1, voltage regulator tube ZD1, and voltage comparator CP1; the specific connection is that the input terminal Vi is connected to the voltage V+ terminal of the detection resistor R1, and the output terminal Vo+ is connected to the voltage V- terminal of the detection resistor R1, the emitter and base of the transistor Q1 are respectively connected to the voltage V+ and V- terminals of the detection resistor R1, the collector of the transistor Q1 is grounded through the pull-down resistor R2, and the collector of the transistor Q1 The connection point with the pull-down resistor R2 is connected to the inverti...

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PUM

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Abstract

The invention relates to an over-current protection circuit of an intrinsically safe power supply. The over-current protection circuit is formed by connecting a detecting circuit with a driving circuit. With the over-current protection circuit, the output current can be intercepted quickly and completely once the intrinsically safe power supply is subjected to over-current output or short circuit, thus, the energy being released under such condition can be limited, and the self-recovery function can be implemented while removing the fault; and the over-current protection circuit is simple in structure, and safe and reliable, and can be widely applied.

Description

technical field [0001] The invention relates to a protection circuit, in particular to an intrinsically safe power supply overcurrent protection circuit. Background technique [0002] Intrinsically safe power supplies are mainly used in environments containing explosive mixtures such as petroleum, chemical, textile and coal mines, as power supply equipment for communication, monitoring, detection, alarm and control systems. According to the requirements of national standards, the electric sparks and thermal effects generated by intrinsically safe equipment under normal operation or specified fault conditions cannot ignite specified explosive mixtures. Therefore, in order to prevent the flammable and explosive gas from being ignited by the spark generated when the output of the intrinsically safe power supply is over-current or short-circuited, a protective circuit must be used to limit the energy released by the spark. [0003] There are three types of overcurrent protectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08H02H3/06
Inventor 张望
Owner 张望
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