The Research On Voltage Stabilised AC Power Supply Based On Double -Oriented Inverting Technology

A great development has happened in the technology of AC voltage-stabilized source during many years. With the increase of applying occasion such as large-scale power supply and family electric apparatus; it makes mechanic adjustment AC voltage-stabilized source become actively and usefully again. This kind of AC voltage-stabilized source had been in seventies. It is controlled by two methods, one is to use the contact of relay to change the tap of transformer, the other is to change the place of charcoal brush moving contact. It has the advantage of making simply, working stabilization, high power and good adaptive for load. At the same time, its disadvantage involves mechanic abrade, long reactive time, short work life and low anti-disturbing ability. From the standpoint of technology, we should use a DSP without contact to replace servo motor, and use semiconductor device to realize the non-contact control of long using life and shorten reactive time.More and more precise instruments required highly for the input power source especially the accuracy of AC stabilized power source along with the development of the new-and high-tech. But, as all we known, the public power supply is not so accurate that we should sometimes add a voltage stabilizer between the load and the public power source to fulfill the request.To meet the need of developing power technology, my paper designs a novel non-contact high power AC compensated stabilizer. The main circuit of the regulation is a compensated transformer, and bi-converters which forms a feedback control network with a DSP and other elements. To compose the AC regulator, it uses bi-directional IGBT as electronic switch and uses a DSP as controller. In this regulator system, a DSP controls bi-directional IGBT triggered and turn-off at zero-crossing to control different combination of secondary coil and realize AC voltage stabilization. So the output voltage from this kind of regulator is constant, undistorted and no harmonic radiation. A DSP adds intelligent fault processing to regulator. And, with the bi-converters, if the voltage of the capacitance is higher than the standard point, the line-converter will feedback the energy to power line. So, it can assure the safe running of the elements.The unit has the features of wide voltage controlled range, fast respond speed, small distortion factor of sine wave in output, high intelligence, strong anti-interference ability and high power factor and efficiency. It can carry inductive and capacitive loads. It can achieve higher voltage stabilized accuracy and can meet common and precise requirements.