Clamping circuit and method for synchronous rectification

H - Electricity – 02 – M

Patent

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Details

H02M 3/335 (2006.01) H02M 7/21 (2006.01)

Patent

CA 2364259

A rectifier circuit having voltage clamping circuitry is disclosed. The rectifier circuit includes a transformer having a primary winding and a secondary winding and transistor switches each being connected to an end of the secondary winding of the transformer. The rectifier circuit further includes a first diode having an anode terminal connected to a first end of the secondary winding and a second diode having an anode terminal connected to a second end of the secondary winding. The cathode terminals of the first and second diodes are coupled to a capacitor. The energy stemming from voltage spikes and/or high frequency ringing appearing at the transistor switches due to parasitic effects is effectively absorbed by the first and second diodes and collected in the capacitor. The collected energy is recycled to control the operation of the transistor switches.

La présente invention concerne un circuit redresseur possédant un circuit stabilisateur de tension. Le circuit redresseur comprend un transformateur doté d'enroulements primaire et secondaire et de commutateurs à transistor, chacun étant relié à une extrémité de l'enroulement secondaire du transformateur. Ce circuit comprend, en outre, une première diode dont un terminal d'anode est relié à une première extrémité de l'enroulement secondaire et une seconde diode dont un terminal d'anode est relié à une seconde extrémité de l'enroulement secondaire. Les terminaux de cathode des première et seconde diodes sont couplés à une capacité. L'énergie provenant de surtensions et/ou d'oscillation de fréquence apparaissant aux commutateurs à transistor, en raison d'effets parasites, est effectivement absorbée par les première et seconde diodes et récupérée dans la capacité. L'énergie récupérée est recyclée afin de commander le fonctionnement des commutateurs à transistor.

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