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Power supply polarity protection circuit

A technology of polarity protection and power supply, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., and can solve problems such as major accidents, electronic equipment not working normally, equipment burning, etc.

Inactive Publication Date: 2009-08-26
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When electronic equipment is powered by an external DC power supply, the polarity of its input must be the same as that of the output terminal of the external DC power supply in order to be able to work effectively and safely. When the operator connects the electronic equipment to the external power supply, sometimes the The positive and negative power input terminals of the electronic equipment are reversely connected with the positive and negative output terminals of the external power supply, which may cause the electronic equipment to not work normally, or cause the equipment to burn out, or even a major accident, resulting in irreparable losses.

Method used

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  • Power supply polarity protection circuit

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Embodiment Construction

[0008] Please refer to figure 1 The power supply polarity protection circuit of the present invention is installed between an electronic equipment power supply input terminal and a DC power supply (not shown), and it includes two input terminals 1 and 2, a triode Q1 as an electronic switch, a relay K and positive, Negative output terminals 3 and 4, the relay K has two normally open contacts K1, K2 and two normally closed contacts K3, K4, and the transistor Q1 is an NPN transistor.

[0009] The input terminals 1 and 2 are used to connect the positive and negative poles of the DC power supply, the base of the triode Q1 is connected to the input terminal 1 through a resistor R, the emitter is connected to the input terminal 2, and the collector is connected to the input terminal 2 through the The relay K is connected to the input terminal 1, the input terminal 1 is connected to the positive output terminal 3 through the normally open contact K1 of the relay K, and is also connect...

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PUM

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Abstract

A power supply polarity protection circuit comprises a first input terminal, a second input terminal, an electronic switch, a relay, a positive output terminal and a negative output terminal; wherein, the relay is provided a first normally open contact, a second normally open contact, a first normally closed contact and a second normally closed contact; the first input terminal and the second input terminal are respectively connected with an anode and a cathode of a DC power supply; a first terminal and a second terminal of the electronic switch are respectively connected with the first input terminal and the second input terminal; a third terminal of the electronic switch is connected with the first input terminal via the relay; the first input terminal and the second input terminal are respectively connected with the positive output terminal and the negative output terminal via the first normally open contact and the second normally open contact, and are also respectively connected with the negative output terminal and the positive output terminal via the first normally closed contact and the second normally closed contact; the positive output terminal and the negative output terminal are respectively communicated with the first input terminal and the second input terminal via the first normally closed contact and the second normally closed contact or via the first normally open contact and the second normally open contact to output correct polarity. The power supply polarity protection circuit is simple in structure.

Description

technical field [0001] The invention relates to a power supply polarity protection circuit. Background technique [0002] When electronic equipment is powered by an external DC power supply, the polarity of its input must be the same as that of the output terminal of the external DC power supply in order to be able to work effectively and safely. When the operator connects the electronic equipment to the external power supply, sometimes the The positive and negative power input terminals of the electronic equipment and the positive and negative output terminals of the external power supply are reversely connected, which may cause the electronic equipment to not work normally, or cause the equipment to burn out, or even a major accident, resulting in irreparable losses. Contents of the invention [0003] In view of the above, it is necessary to provide a power supply polarity protection circuit to protect electronic equipment from being damaged when the polarity of the exte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/18H02H11/00
Inventor 赵泉亮龙俊成
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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