Flyback converter with an adaptively controlled rectifier arrangement

US8611109B2 · kind B2 · utility

Assignee

• Infineon Technologies AG · DE

Inventors

• Werner Roessler · Alteglofsheim, DE
• Michael Hausmann · Graz, AT

Key dates

• Filing date: Sep 30, 2010
• Grant date: Dec 17, 2013
• Expiry date: Feb 5, 2032

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02M3/33576
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A flyback converter includes input terminals and output terminals. A transformer with a first winding and a second winding are inductively coupled. A first switching element is connected in series with the first winding and a first series circuit with the first switching element, the first winding being coupled between the input terminals. A rectifier arrangement is connected in series with the second winding and a second series circuit with the rectifier arrangement, the second winding being coupled between the output terminals. The rectifier arrangement includes a second switching element. A control circuit is configured in one drive cycle to switch on the first switching element for a first time period. After the first time period the second switching element is switched on for a second time period. A third time period is determined between an end of the second time period and the time at which the transformer assumes a predetermined transformer state. The control circuit is further configured to adapt the second time period to be applied in a subsequent drive cycle dependent on the second time period applied in the one drive cycle and the third time period is determined in the …