| 摘要 |
A circuit for clamping a voltage across a switching element to a value equal to or less than the sum of the input voltage plus the voltage across a clamping capacitor is provided. The circuit achieves voltage clamping accordance with one embodiment in which an active clamp circuit includes a switch and a clamping capacitor connected in parallel with a first winding of a coupled winding. The active clamp prevents the occurrence of voltage spikes across the switch. The clamping capacitor recovers energy stored in the first winding of the coupled winding. The circuit achieves voltage clamping in accordance with a second embodiment in which a passive clamp circuit includes a switch a clamping capacitor,and first and second diodes. The passive clamp circuit prevents the occurrence of voltage spikes across the switch. The clamping capacitor recovers energy stored in the first winding of the coupled winding. |
