High Efficient AC/DC Converter

There is a continuous increased use of power electronic drive systems in the process industries such as paper mills. The topology of the power converters is being continuously evolved to improve the performance of the drive system. This work addresses such advancement in the power converter system used in the drive system. This project work proposes a single-stage High-Power-Factor AC/DC Converter that is derived from the integration of a Buck-Boost Converter and a Flyback Converter. Both converters share the same active switch. It results in reduction of component count, leading to low product cost. The Buck-Boost Converter serves as a Power-Factor Corrector (PFC) that is designed to operate at discontinuous-current mode to waveshape the input current to be sinusoidal and in phase with the input line voltage. A high power factor and high efficiency can be achieved. The Flyback Converter plays the role of the DC/DC Converter that provides an isolated output voltage with very low voltage ripple. The proposed circuit is with simple control. Besides, it can meet the design goals of high power factor, low voltage ripple and low product cost.