| CPC H02M 1/15 (2013.01) [H02M 1/344 (2021.05); H02M 3/158 (2013.01)] | 20 Claims |
|
1. A dual-path active damper for a resonant network in which a forcing function Vs produces a node voltage Vr for a device that rings about a steady-state value Vss at each positive state change of the forcing function, said dual-path active damper comprising:
a snubber capacitor Csnub coupled to the node;
a clamping path including a clamp voltage Vclamp in series with Csnub, said clamping path conducting a clamp current Iclamp at only each positive state change to flow through Csnub and Vclamp to clamp a peak value of node voltage Vr at Vss+Vclamp, wherein node voltage Vr is allowed to ring and dampen naturally to store energy on Csnub for a set interval after the positive state change that extends beyond the clamping of the peak value; and
a damping path including a snubber resistance and an active switch in series with Csnub, wherein at the expiration of the set interval, said active switch closes such that the flow of Iclamp is suspended and the damping path conducts a reset current Ireset through the Csnub, the snubber resistance and the active switch in a direction opposite that of Iclamp to dampen the ringing of node voltage Vr and reset the energy in Csnub.
|