Circuit with reversed power polarity and inrush voltage protection

Abstract

The invention discloses a protection circuit which is used for preventing reversed polarity of power and inrush voltage, comprising an overvoltage protection circuit; the invention is characterized by further comprising a protection circuit against reversed polarity; the overvoltage protection circuit is composed of a voltage dependent resistor and a transient voltage suppresser; one end of the voltage dependent resistor is connected with an input end 1 and a power anode, and the other end is connected with an input end 2 and a grounding terminal; a positive end of the transient voltage suppresser is connected with an output end 2 and the grounding terminal, and a negative end of the transient voltage suppresser is connected with an output end 1; the protection circuit against reversed polarity comprises a relay contact protection circuit and a sub-circuit; the relay contact protection circuit is serially connected between the power anode and the output end 1; one end of the sub-circuit is connected with the power anode, and the other end is connected with the output end 2. The invention realizes a reversed polarity protection circuit with low current controlling big current, low power consumption and high reliability, to ensure correct polarity connection of the input power and effectively protect precise components in inner circuit, thus ensuring the normal and reliable running of power in the electronic circuit.

Description

technical field [0001] The invention relates to a power supply protection circuit, in particular to a circuit with power supply polarity reverse connection and inrush voltage protection. Background technique [0002] In the prior art, the power supply protection circuit uses a diode, which causes too much power consumption and cannot realize large current control. There is no intrusive overvoltage protection circuit, which is easily damaged by various surge pulses; when the user accidentally reverses the polarity of the power supply, it will seriously damage the precision components in the electronic circuit. Contents of the invention [0003] The purpose of the present invention is to provide a circuit with power supply polarity reverse connection and inrush voltage protection, the circuit can confirm the breakpoint and automatically restore the operation of the device, and does not affect the communication function of the node, which can ensure that the power supply of t...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the power supply protection circuit uses a diode, which causes too much power consumption and cannot realize large current control

There is no intrusive overvoltage protection circuit, which is easily damaged by various surge pulses; when the polarity of the user's power supply is accidentally reversed, it will seriously damage the precision components in the electronic circuit

Images