A New Soft switching Isolated Buck-Boost PWM Converter

作者：Delshad M^*; Farzanehfard H

来源：International Review of Electrical Engineering, 2008, 3(5): 829-836.

• Active Clamp
• Soft Switching
• PWM
• Buck-Boost
• Flyback Current Fed

In this paper, a new soft switching isolated buck-boost PWM converter with active clamp circuit is proposed. The active clamp circuit in this converter not only absorbs voltage spikes across the main switch but also provides soft switching conditions for both main and auxiliary switches. All switches are PWM controlled which simplifies the control implementation. One of the main advantages of this converter is the possibility of sharing the output power between the magnetic devices and operating at high power levels while soft's witching conditions exist in both buck and boost modes of converter operation. Since this converter can operate over a wide input voltage range, it can be employed in power factor correction. The experimental results obtained from a 150W prototype circuit operating at 100 KHz are presented to confirm the integrity of proposed circuit.

• 出版日期2008-10