Aa control circuit and a power supply for suppressing surge voltage and current of a power supply

Abstract

The invention relates to a control circuit and a power supply for suppressing the surge voltage and current of a power supply, comprising a driving circuit and a power supply output terminal, whereinthe driving circuit receives the output voltage of the power supply and generates a driving signal according to the output voltage; and a voltage monitoring circuit which monitors the output voltage of the power supply and conducts and outputs a conduction signal when the power supply generates a surge voltage; a voltage and current limiting circuit respectively connected with a driving circuit and a negative output terminal of the power supply; a switch protection circuit is respectively connected with a driving circuit, a voltage monitoring circuit and a voltage and current limiting circuit;when the output voltage of the power supply is normal, the voltage and current limiting circuit conducts according to the driving signal to make the output voltage of the power supply normal; When the surge voltage is generated from the power supply, the switching protection circuit conducts according to the conduction signal output from the voltage monitoring circuit, so that the voltage and current limiting circuit limits the output voltage and output current of the power supply. This scheme can restrain the surge voltage and current of the power supply, so as to achieve the effect of protecting the power supply and the load.

Description

technical field [0001] The present invention relates to the technical field of power supply, more specifically, to a control circuit and power supply for suppressing surge voltage and current of the power supply. Background technique [0002] After the LED power supply is started, when the voltage of each loop has stabilized, and the voltage and capacitance of each system have been charged, if the load switching action is performed suddenly at the LED lamp bead end, the start-up surge voltage and current of the LED lamp bead after power-on will decrease. Sudden increase. The inrush current will increase the burden on the power supply and make it difficult to start. Since the LED lamp bead becomes brighter with the increase of the current, a current exceeding the rated specification will flow through the LED lamp bead at the moment of start-up, which is obvious to the human eye. To the lamp bead from dark to bright and then to the normal process. Another problem is that the...

AI Technical Summary

Problems solved by technology

[0005] The start-up surge voltage and current at the output end is large, and the LED lamp beads are easily burned out;

[0006] The start-up surge voltage current is suppressed, but the start-up time is prolonged

Images