Protection circuit capable of preventing wrong voltage access

A technology for protecting circuits and voltage input terminals, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as damage to low-voltage controllers and low-voltage electrical appliances, inability to protect high-voltage AC voltage, and fire, etc. Comprehensive and comprehensive cost-effective effect

CN114156857APending Publication Date: 2022-03-08KEBODA TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2022-03-08

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Abstract

A protection circuit capable of preventing wrong voltage access comprises a voltage input end, a voltage output end, a first one-way conduction element, a triode control circuit, a first triode, a first capacitor, a Darlington tube, a first resistor, a second resistor and a relay. And a relay contact is connected in series between the voltage input end and the voltage output end. The first end of the first one-way conduction element is connected with the voltage input end, and the second end of the first one-way conduction element is connected with the first resistor, the first triode, the first capacitor and the first end of the Darlington tube. The first conduction end of the triode control circuit is connected with the second end of the first resistor and the controlled end of the first triode, and the second conduction end is grounded. The first end of the second resistor is connected to a common connection point of the second end of the first triode, the second end of the first capacitor and the controlled end of the Darlington tube, and the second end of the second resistor is grounded; the second end of the Darlington tube is connected with the controlled end of the relay. The circuit is low in cost, and can cut off the connection from the input end to the output end when wrong voltage is input.
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Description

technical field

[0001] The invention relates to protection circuit technology. Background technique

[0002] With the development of intelligence and electrification of automobiles, there are more and more cases of overlapping power supply, and it has become a common phenomenon to use mains power and high-voltage direct current to charge automobiles. The power interface on many cars is a low-voltage power interface with a working voltage of 12V or 24V. When such as high-voltage direct current, alternating current (including mains power) is mistakenly connected to the low-voltage power interface, if there is no wrong voltage protection, the car will be damaged. The internal low-voltage controller and low-voltage electrical appliances are damaged or even caught fire. Port protection devices currently on the market, such as varistors, TVS diodes, fuses, etc., can only protect short-term surge voltages, but cannot protect high-voltage DC voltages and high-voltage AC voltages th...

Examples

Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] figure 1 A circuit diagram of a protection circuit capable of preventing wrong voltage access according to the first embodiment of the present invention is shown. see figure 1 . A protection circuit capable of preventing wrong voltage access according to the first embodiment of the present invention includes a voltage input terminal IN, a voltage output terminal OUT, a first unidirectional conduction element D1, a transistor control circuit 1, a first transistor Q1, The first capacitor C1, the Darlington tube 2, the first resistor R1, the second resistor R2 and the relay K1.

[0015] The normally open contact of the relay K1 is connected in series between the voltage input terminal IN and the voltage output terminal OUT. Wherein, one end of the normally open contact of the relay K1 is connected to the voltage input terminal IN, and...