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.
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[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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