Actively Clamped Two-Switch Flyback Converter with High Efficiency

Abstract

This paper proposes an actively clamped two-switch flyback converter. Compared to the conventional two-switch flyback converter, the proposed two-switch flyback converter operates with a wide duty cycle range. By using an active-clamp circuit, the proposed converter achieves zero-voltage switching for all of the power switches. Zero-current switching of an output diode is also achieved. Thus, compared with the conventional converter, the proposed converter realizes a higher efficiency with an extended duty cycle. The performance of the proposed converter is verified by the experimental results with use of a 1.0 kW prototype circuit.

Micro converter with a high step-up ratio to drive a piezoelectric bimorph actuator applied in mobile robots

“…The driving circuit topology shown in Figure 2 includes DC/DC and DC/AC stages. 26,27 The former stage uses a DC/DC converter with a typical flyback topology that can boost voltage from a low DC voltage, such as a lithium battery, to a high DC voltage. The latter stage uses a DC/AC converter with a half-bridge circuit and an inductance applied in the energy storage to recover unused energy efficiently.…”