Logic protection emitter coupling-type three-filtering nonlinear negative feedback switching voltage-stabilizing power supply

Abstract

The invention discloses a non-linear negative feedback switching regulated power supply based on a logic protection emitter-coupled mode. The non-linear negative feedback switching regulated power supply mainly includes a diode rectifier U, a power amplifier P1, a transformer T, a switching filtering circuit connected in series between the diode rectifier U and the power amplifier P1, a power output circuit connected with a secondary coil L2 of the transformer T, a transformation feedback circuit connected with a secondary coil L3 of the transformer T, a non-linear negative feedback circuit connected with the transformation feedback circuit, and the like. The non-linear negative feedback switching regulated power supply is characterized in that a logic protection emitter-coupled amplifying circuit is connected in series between a negative output end of the diode rectifier U and an out-phase end of the power amplifier P1. The non-linear negative feedback switching regulated power supply provided by the invention has the advantages that through the non-linear property of the non-linear negative feedback circuit, regulating transistors can be automatically kept at the edge of a saturation region, so that the radio-frequency interference from the circuit and an external device is effectively reduced, and the circuit structure is greatly simplified to achieve much lower manufacture and maintenance costs.

Description

Technical field [0001] The invention relates to a switch regulated power supply, in particular to a logic protection emitter coupling type three-filter type nonlinear negative feedback switch regulated power supply. Background technique [0002] With the continuous advancement of current technology, electronic products are becoming more and more powerful while also bringing great convenience to people's lives. The voltage stabilizing circuit is born out of operation. The traditional series linear adjusting voltage stabilizing circuit has the characteristics of high stability, adjustable output voltage, small ripple coefficient and simple circuit. However, the regulator tubes of these series linear regulator circuits always work in amplifying state, and there is always current flowing, 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 overcome the above-mentioned short...

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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 logic protection emitter-coupled three-filter non-linear negative feedback switch regulated power supply

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