Expiremantal results and study of a modified adaptive bus voltage controller

Two-stage power conversion is used in many applications. The determination of the bus voltage in two-stage converter is important to achieve high overall power conversion efficiency. Conventional two-stage converters utilize either a fixed DC bus voltage or a variable but predetermined DC bus voltage, which do not necessarily result in an optimum operation with optimum bus voltages under variable conditions. The paper presents a modified adaptive bus voltage controller for two-stage power converter. The controller adaptively converges to the optimum bus voltage that yields to the maximum power conversion efficiency under variable operating conditions. The modified adaptive two-stage bus voltage controller is evaluated using results obtained from a proof of concept experimental prototype.