Converter feedback control circuit and converter comprising converter feedback control circuit

Abstract

The invention provides a converter feedback control circuit and a converter comprising the converter feedback control circuit. The feedback control circuit comprises n sub-feedback units and a weighing arithmetical unit, and n is a natural number and greater than 1; each sub-feedback unit comprises a feedback input end and a disturbing signal end; the weighing arithmetical unit comprises n signalinput ends and a signal output end, and each sub-feedback unit is used for collecting output voltage of the converter corresponding to each circuit and outputting sampling voltage to each corresponding signal input end of the weighing arithmetical unit; the weighing arithmetical unit is used for carrying out weighted sum on each sampling voltage and outputting feedback control quantity to a control end of a main power circuit unit. The feedback control circuit adopts common ground connection of the weighing arithmetical unit and transformer input primary side and an isolated feedback mode, sothat stable voltage output is respectively achieved among multiple isolated circuits, improves voltage accuracy and load regulation of each circuit of multiple mutual isolated circuit output of the converter, and reduces ripple wave noise output by a secondary circuit.

Description

technical field [0001] The invention relates to the feedback control of converters, in particular to the feedback control of mutually isolated multi-output converters. Background technique [0002] At present, the widely used switching power supply topologies mainly include single-ended flyback, single-ended forward, half-bridge, full-bridge, push-pull and other types. Most of the multi-output power supplies use one of them as the main channel for feedback, while the other outputs work in an open-loop state as auxiliary channels. The open loop of the auxiliary circuit output does not mean that there is no voltage regulation, but the voltage regulation of the auxiliary circuit output is carried out in the form of adding TVS tubes and dummy loads and through the coupling of the transformer. Since the auxiliary circuit is not the same as the main circuit, the auxiliary circuit lacks a precision voltage regulator to monitor the output, so the load regulation and voltage accurac...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention provides a feedback control circuit and a converter including the circuit. The feedback control circuit can solve the problems of poor load regulation and poor voltage accuracy in the above-mentioned traditional technology, narrow the range of output voltage variation, and make mutual Isolated multi-output converter auxiliary output is more stable

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