Non-linear negative feedback switching voltage-stabilized power supply based on constant current protection

Abstract

The invention discloses a light beam exciting type logic protective nolinear negative feedback stabilized switching power supply which is mainly composed of a diode rectifier U, a power amplifier P1, a transformer T, a switch filter circuit, a power output circuit and the like, wherein the switch filter circuit is connected between the diode rectifier U and the power amplifier P1 in series, and the power output circuit is connected with a secondary side coil L2 of the transformer T. The light beam exciting type logic protective nolinear negative feedback stabilized switching power supply is characterized in that a light beam exciting type logic amplifying circuit is further connected between the negative electrode output end of the diode rectifier U and a PWM controller in series, and a logic protection emitter coupled type amplifying circuit is further connected between the reversal phase end of the power amplifier P1 and the switch filter circuit in series. The nonlinear characteristics of a nolinear negative feedback circuit are utilized to enable a regulating tube to be located on the edge of a saturation region automatically, radio-frequency interference of the circuit and external radio-frequency interference are lowered effectively, the circuit structure is simplified greatly, and the manufacturing cost and the maintenance cost are reduced greatly.

Description

technical field [0001] The invention relates to a switch stabilized voltage power supply, in particular to a non-linear negative feedback switch stabilized voltage power supply based on constant current protection. 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 or...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the current switch-type regulated power supply does not check and control the current, and when the input current is too large, it is easy to damage the switch-type regulated voltage circuit or subsequent electrical equipment, and provides a constant current protection based Nonlinear Negative Feedback Switching Regulated Power Supply

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