A power supply protection device

Abstract

The invention provides a power supply protection device, which is connected in series with a power supply source; the switch action ends of a first electric control switch and a second electric control switch are sequentially connected in series with a sampling resistor and are connected to the power supply source / a power supply end; the serially connected switch action ends of the first electriccontrol switch and the second electric control switch are integrally connected with the input end of an electric control switch monitoring circuit; the two ends of the sampling resistor is connected with the differential input end of a first differential amplification circuit; the output end of the first differential amplification circuit is respectively connected with the first input end of a first comparison circuit and the first input end of a second comparison circuit; the output ends of the first comparison circuit, the second comparison circuit and the electric control switch monitoringcircuit are connected with the triggering end or input end of a logic conversion circuit; the output end of the logic conversion circuit is connected with the triggering end of a triggering circuit and / or a warning circuit. Compared with the prior art, the power supply protection device has the advantages that the safety is higher; after the work switch fails, the secondary fault due to short circuit can be timely avoided.

Description

technical field [0001] The invention relates to the technical field of power supply, in particular to a power supply protection device. Background technique [0002] With the promotion and use of power supply equipment, related accidents emerge in endlessly. The power supply equipment has overload protection and short circuit protection circuits. Although the circuit structure is various, it is usually simple in structure. When the value is high, it is protected, and it is only protected for the protected object, lacking compensation and protection means; when the parameter performance of the protection component itself changes due to the influence of the use environment and use time, the user cannot know in time. If there are problems, it may cause accidents; in order to solve the above problems, it is necessary to conduct in-depth research. Contents of the invention [0003] Aiming at the deficiencies in the prior art, the invention provides a power supply protection de...

AI Technical Summary

Problems solved by technology

[0002] With the promotion and use of power supply equipment, related accidents emerge in endlessly. The power supply equipment has overload protection and short circuit protection circuits. Although the circuit structure is various, it is usually simple in structure. When the value is high, it is protected, and it is only protected for the protected object, lacking compensation and protection means; when the parameter performance of the protection component itself changes due to the influence of the use environment and use time, the user cannot know in time. problems, it may cause accidents; in order to solve the above problems, it is necessary to conduct in-depth research

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