Flyback converter for implementing auxiliary output voltage control by using triode and control method

Abstract

The invention discloses a flyback converter for implementing auxiliary output voltage control by using a triode and a control method. The flyback converter comprises a transformer, a main switch, a PWM (pulse width modulation) control circuit, a main output rectification filter circuit, an auxiliary output rectification filter circuit and an auxiliary output control circuit, wherein the main switch is connected with the primary winding of the transformer; the PWM control circuit controls the main switch; the main output rectification filter circuit is connected with the secondary winding of the transformer; the auxiliary output control circuit is connected with the auxiliary output rectification filter circuit; the auxiliary output rectification filter circuit comprises an auxiliary loop switch; and the auxiliary output control circuit switches on and off the auxiliary output rectification filter circuit through controlling the auxiliary loop switch. According to the invention, the stability of the auxiliary output voltage is improved effectively, the circuit loss is reduced, and the flyback converter has the advantages of small volume, low cost, simpleness for control and the like.

Description

technical field [0001] The invention relates to the technical field of switching power supply converters, in particular to a flyback converter and a control method which use triodes to realize auxiliary output voltage control. Background technique [0002] The traditional multi-output flyback converter is widely used in various complex electronic system power supplies with low power due to its advantages of simple circuit structure and low manufacturing cost. The general multi-output flyback converter obtains multiple different outputs by coupling multiple windings in the same transformer. The main output passes through the feedback loop to keep the output voltage stable. The main output has good power regulation and load Adjustment rate, while other auxiliary outputs adjust their respective outputs through intermodulation capability. Ideally, the auxiliary output voltage and the main output voltage meet the relationship between the transformer turns ratio, that is, as long ...

AI Technical Summary

Problems solved by technology

The solution of the magnetic amplifier has small loss and good regulation performance, but it has the defects of complex circuit structure, large volume and high cost, and loses the inherent advantages of simple configuration and low cost of the flyback converter

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