Research On Invariable-angle Control Of Parallel Resonance Converter

According to the various feature of present parallel resonance converter's control technique, the control circuit is analyzed profoundly, and the control of converter function state is mainly solved. The load characteristic and control objective of parallel resonance converter is analyzed, and the conclusion that it can work on the safe side only if it works under the state of capacitive and rough resonance is drawn. A invariable -angle control circuit of parallel resonance converter which can get high precise control of inverter operating state is designed. Using the technique of phase-lock loop, the circuit implements automatic tracking to inverter operating frequency and constant control of capacitive power factor angle. It has been proved that the circuit has improved automatic operator level by a prototype test. The circuit brings a great facility to field debug, reduces the occur ratio of accident and complements closed-loop control of the whole inverter.