Abstract
This is the first attempt of controlling the instantaneous output voltage of an AC/AC direct power converter. The AC chopper-type regulator has the potential ability of quick response to the control command. However, detecting the mean or effective value of the AC output voltage, as is commonly done in the conventional closed-loop AC regulators, greatly ruins the inherent fast response capability of the chopper circuit.
The proposed AC switching regulator adopts the _??_uk converter for the main circuit and an instantaneous voltage control technique. A practical state feedback scheme together with the integral control was devised to stabilize the system and also minimize the steady state error. The response speed is so fast (about 300μs with resistive load) that the converter can produce a sinusoidal output voltage even from a distorted source voltage. The four quadrant operation can handle any kind of AC load. A complete analytical description and relevant design data of this new regulator are provided with some experimental results.
