Logic protection emitter coupling excitation type filtering amplification LED constant power supply

Abstract

The invention discloses a logic protection emitter coupling excitation type large-current LED constant power source. The 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 connected between the output end of the positive electrode of the diode rectifier U and the in-phase end of the power amplifier P1 in series, a power output circuit connected with a secondary side coil L2 of the transformer T and the like. The power source is characterized by being further provided with a light beam excitation type logic amplifying circuit connected with the diode rectifier U, a slope compensator M and a current detection amplifier circuit and a logic protection emitter coupling amplifying circuit connected between a ramp generator and an oscillator in series. According to the power source, current detection is achieved through the current detection amplifier circuit, the loaded current of the switching power source can be effectively increased, and the application range of the power source is widened.

Description

technical field [0001] The invention relates to a switch stabilized voltage power supply, in particular to a logic protection emitter coupling excitation filter amplification constant power supply for LEDs. 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 order to o...

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 to provide a logic-protected emitter-coupled excitation type filter-amplified constant power supply for LEDs

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