Discussion of Design for Twin Converter

Abstract

A capacitor input type rectifier is spreading widely by reason that its circuit configuration is simple and low cost. However, the rectifier includes many harmonics in an input current, and an input power factor is low. Hence, the input current harmonics cause voltage waveform distortion of an input power source, and the low power factor causes efficiency decline.Many sinusoidal rectifiers have been proposed to solve these problems. However, most of them have any complicated control such as a pulse width modulation (PWM) or a feed back control. Therefore, the authors have been proposed a twin converter which is composed of a full bridge diode rectifier, a pair of capacitors, a pair of reactors, and a pair of switching devices. The twin converter has simple configuration and simple control strategy. And excellent performance of the twin converter is revealed. However, the design method of the twin converter is not established firmly.Therefore, this paper studies on design method of the twin converter. And the design method is shown in detail in order to derive optimum values of the pair of reactors and the pair of capacitors. Moreover, experiments are carried out to verify the feasibility of the proposed design method of the twin converter.