Soft-switch power converter e.g. with soft-switch boost circuit, includes rectifier coupled to storage inductor and active snubber to transfer energy to output terminal

• Main Authors: FANG, KUNG-HUI, JOVANOVIC, MILAN, JANG, YUNGTAEK, CHANG, YU-MING
• Format: Patent
• Language: English; German
• Published: 16.12.2004
• Edition: 7
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

A power converter has an input connection and an output connection and comprises a storage inductor coupled to the input connection, a first switch for charging- and discharging the storage inductor, an active snubber with a second switch coupled to a reference voltage, a rectifier which is coupled to the storage inductor to the active snubber and to the output terminal to transfer energy from the storage inductor to the output connection. A control circuit provides control signals for controlling operation of the first- and second-switch via the switching cycle so that the second switch closes in order to effect that a current is conducted in the rectifier and from the rectifier to the active snubber in order to enable the first circuit to close at zero voltage and to re-enable it so that the second switch opens at zero current. An independent claim is also included for a method for power regulation in power converter. Ein softgeschalteter Boost-Wandler beinhaltet einen aktiven Snubber zum Bereitstellen einer Softschaltung aller Halbleiterkomponenten. Insbesondere wird der Strom ("Abschaltstrom") im Gleichrichter mit einer geregelten Rate abgeschaltet, der Hauptschalter wird bei Nullspannungsschaltung (ZVS) geschlossen, und der Zusatzschalter im aktiven Snubber wird unter Nullstromschaltung (ZCS) geöffnet. Infolgedessen werden Schaltverluste reduziert, mit vorteilhaften Auswirkungen auf die Wandlungseffizienz und die EMV-Leistung.