Active-clamp forward converter with regenerative snubber
AssigneeDelta Electronics (Thailand) Public Co., Ltd.
InventorsPhilipp Rehlaender, Bastian Korthauer, Frank Schafmeister, Joachim Böcker
Life of this patent
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Abstract
A power converter-circuit (100) having a transformer (T), comprising a snubber-circuit (Csn, DSn,S3, S3, DSn,S4) for suppressing voltage peaks on a secondary side of the transformer (T) that comprises a snubber capacitor (Csn); and an auxiliary DC-DC converter (101) having a first input connected with the snubber capacitor (Csn) and a first output connected with a first output (VOut) of the power converter-circuit (100). This circuit increases efficiency of electrical conversion and reduces thermal losses.
Claims16
A power converter-circuit having a transformer, comprising:
- a snubber-circuit for suppressing voltage peaks on a secondary side of the transformer that comprises a snubber capacitor;
- and
- an auxiliary DC-DC converter having a first input connected with the snubber capacitor and a first output connected with a first output of the power converter-circuit;
- wherein the auxiliary DC-DC converter is a multiphase buck converter in which a number of n buck converter circuits are placed in parallel between an input and an output of the auxiliary DC-DC converter, and wherein a phase of each of the n buck converters is turned on at equally spaced intervals over a switching period.
A converting method for a power converter-circuit having a transformer, comprising the steps of:
- suppressing voltage peaks on a secondary side of the transformer with a snubber circuit that comprises a snubber capacitor;
- returning energy from the snubber capacitor to a first output of the power converter-circuit by means of an auxiliary DC-DC converter having a first input connected with the snubber capacitor and a first output connected with the first output of the power converter-circuit;
- wherein the auxiliary DC-DC converter is a multiphase buck converter in which a number of n buck converter circuits are placed in parallel between an input and an output of the auxiliary DC-DC converter;
- and
- turning on a phase of each of the n buck converters at equally spaced intervals over a switching period.
Dependencies are inferred from the claim text.