Abstract
Configuring half-bridge circuits with CRC or RC circuits at both ends of
the bus, RC circuits at both ends of the device, and in conjunction with
reduced loop inductance is a typical solution to address half-bridge
switching oscillations and voltage overshoots, and to optimize
electromagnetic interference (EMI) characteristics. However, this scheme
still has the problems of poor damping effect, high degree of
overvoltage, and high turn-on loss. In this paper, we remove the
switch-by-switch RC circuit to reduce extra losses, actively increase
the inductance of the feeder circuit to achieve zero current turn-on,
and design a DC(VS)-RC absorption topology with energy return circuits
at both ends of the bus. The designed topology absorbs the overvoltage
energy stored in the inductor of the switching converter and feeds it
back to the bus to reduce the overvoltage and improve efficiency.
Experimental studies and comprehensive comparative studies verify the
effectiveness of the proposed scheme. The experimental results show that
DC(VS)-RC with increasing loop inductance has good overvoltage and
oscillation suppression performance and can significantly reduce the
switching losses.