Excitation type large-current boosting double-filtering LED (Light-Emitting Diode) constant switching stabilized voltage supply

Abstract

The invention discloses an excitation type large-current LED constant switching stabilized power source. The excitation type large-current LED constant switching stabilized power source is mainly composed of a diode rectifier U, a power amplifier P1, a transformer T, a voltage comparator U1, a switch filter circuit, a power output circuit, a voltage transformation feedback circuit, a nonlinear negative feedback circuit, a current detection amplifier circuit and the like, wherein the switch filter circuit is connected between the positive electrode output end of the diode rectifier U and the same-phase end of the power amplifier P1 in series, the power output circuit is connected with a secondary-side coil L2 of the transformer T, the voltage transformation feedback circuit is connected with a secondary-side coil L3 of the transformer, the nonlinear negative feedback circuit is connected with the voltage transformation feedback circuit, the input end of the current detection amplifier circuit is connected with the negative electrode output end of the diode rectifier U, and the output end of the current detection amplifier circuit is connected with the R end of the voltage comparator U1. According to the excitation type large-current LED constant switching stabilized power source, current detection is achieved through the current detection amplifier circuit, the borne current of the switching stabilized power source can be effectively increased, and the application range of the power source can be accordingly wider.

Description

technical field [0001] The invention relates to a switch stabilized voltage power supply, in particular to an excitation type large current boost double filter type LED constant switch stabilized voltage power supply. Background technique [0002] With the continuous advancement of science and technology, electronic products have brought great convenience to people's life while their functions are becoming more and more powerful. The voltage stabilizing circuit is easy to operate. The traditional series linear regulating voltage stabilizing circuit has the characteristics of high stability, adjustable output voltage, small ripple coefficient, and simple circuit. However, the adjustment tubes of these series linear adjustment type voltage regulator circuits always work in the amplified state, and current flows all the time, so the power consumption of the tubes is relatively large, and the efficiency of the circuit is not high, generally only reaching 30% to 50%. %about. In...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of large ripple coefficient, serious radio frequency interference, complex circuit and low efficiency existing in the current switch-type regulated power supply, and provide an excitation-type high-current boost double-filter LED constant switch regulated power supply

Images