| Abstract |
A new active clamping snubber (ACS) for a ZVS PWM current-fed half-bridge converter (CFHB) is
proposed in this paper. It can not only absorb the voltage surge across the turn-off switch, but also
achieve the ZVS of all power switches. Moreover, it can be applied to all current-fed converter
topologies and its operation as well as structure is very simple. Since the auxiliary switches in the
snubber circuit are switched in a complementary way to the main switches, an additional PWM IC is
not necessary. Therefore, it can ensure the higher operating frequency, smaller-sized reactive
components, lower cost of production, easier implementation, and higher efficiency. The operational
principle, theoretical analysis, and design considerations are presented. To confirm the operation,
validity, and features of the proposed circuit, experimental results from a 200W, 24-200Vdc prototype
are presented. |
