An overcurrent protection circuit

Abstract

An embodiment of the invention discloses an over-current protection circuit comprising a current limiting resistor, a comparator, a first triode, a second triode, a third triode, a sampling resistor, and a load. One end of the current limiting resistor is connected to the positive pole of a power supply; the other end of the current limiting resistor is connected with the in-phase input end of the comparator; the reverse-phase input end of the comparator accesses a reference voltage; the output end of the comparator is connected with the base of the second triode; the collector of the second triode is connected with the base of the third triode; the collector of the third triode is connected to the positive pole of the power supply; the emitter of the third triode is connected with the power input end of the load; the grounding end of the load is connected with one end of the sampling resistor; the other end of the sampling resistor is connected to the negative pole of the power supply; the grounding end of the load is connected with the base of the first triode; and the collector of the first triode is connected with the in-phase input end of the comparator. By adopting the over-current protection circuit of the invention, the load and the power supply can be disconnected to avoid damage to the load when the working current of the load is too large.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an overcurrent protection circuit. Background technique [0002] With the continuous development of electronic technology, users have higher and higher requirements for electrical equipment. Among them, safety indicators have become an important reference factor for users to choose electrical equipment. During the use of electrical equipment, if the circuit causes excessive current due to short circuit, aging and other reasons, it will damage the electrical equipment at least, and cause a safety accident at worst. For example, when the operating current of the LED lamp is too large, the LED lamp will be burned out or a fire will be caused. Contents of the invention [0003] The technical problem to be solved by the embodiments of the present invention is to provide an overcurrent protection circuit that disconnects the load from the power supply when the load operating cu...

AI Technical Summary

Problems solved by technology

During the use of electrical equipment, if the circuit has too much current due to short circuit, aging, etc., it will damage the electrical equipment in the slightest, and cause a safety accident in the worst case.

For example, when the operating current of the LED lamp is too large, it will burn out the LED lamp or cause a fire

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