Zero-voltage-switching DC-DC converters with synchronous rectifiers
AssigneeAstec International Limited
InventorHong Mao
Life of this patent
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Abstract
A DC-DC converter includes an inductor, a synchronous rectifier (SR) connected to the inductor, and an active switch connected to the inductor and the SR. An active resonant tank (ART) cell is connected to the SR or a transformer in parallel such that a resonant capacitor of the ART cell is charged through the active switch and discharged through the synchronous rectifier so that during a switch transition period energy is pumped out of the resonant capacitor by activating the ART cell to eliminate reverse recovery switching loss and achieve Zero Voltage Switching (ZVS).
Claims38
A DC-DC converter comprising:
- a first inductor;
- a synchronous rectifier connected to the inductor;
- a first switch connected to the inductor and the synchronous rectifier;
- and
- an active resonant tank cell including a second switch, a second inductor and a capacitor, the second inductor and the capacitor coupled in series with the second switch, the active resonant tank cell connected to the synchronous rectifier in parallel.
A dc-dc converter comprising:
- a transformer having a primary winding and a secondary winding;
- a synchronous rectifier connected to the secondary winding;
- and
- a first active resonant tank cell connected across the primary winding, the first active resonant tank cell including a switch, an inductor and a capacitor, the inductor and the capacitor connected in series with the switch.
A dc-dc converter comprising:
- a transformer having a primary winding and a secondary winding;
- a synchronous rectifier connected to the secondary winding;
- an external winding electromagnetically coupled to the primary winding and the secondary winding;
- and
- a first active resonant tank cell connected across the external winding, the first active resonant tank cell including a switch, an inductor and a capacitor. the inductor and the capacitor connected in series with the switch.
Dependencies are inferred from the claim text.