Simulation on soft-switching PWM converter with high power factor

Abstract

A new PWM converter based on soft-switching is introduced. The converter uses a minimum number of devices, and requires less switching operations than conventional techniques. Switching is realized solely in a ZVS (zero voltage switching) mode, therefore the loss is reduced and EMI (electromagnetic interference) is suppressed. The paper analyzes the operation of ZVS, and discusses the methods for maintaining a unit power factor and constant DC voltage. Changing the modulation index M and the phase angle 0 keeps the input current in phase with the voltage. It also keeps the current sinusoidal, and ensures a constant output voltage.

Design of Transmission Endurance Tester with Electric Energy Recycle Technology

“…Figure 2 is the diagram of transmission endurance tester with electric feedback. The tester comprises the following components: i) Speed controller A frequency converter, a sensor and a computer compose the speed controller which meets the speed requirements of different transmissions and keeps the speed of driving motor constantly [2] . The speed is automatically controlled by computer and frequency converter.…”