Research on Digital Ultra Audio Frequency Induction Heating Power Supply Based on Digital Signal Processor

Traditional phase-shifted pulse width modulation(PWM) control strategy exists defect when ultra audio frequency induction heating power supply in light load,therefore,a new power control strategy which combines limited bipolar PWM method and phase-shifted PWM control is put forward.It makes ultra audio induction heating power supply in light load still realize soft switching.Mean while,the series resonance ultra audio induction heating power control system which realized rectifier soft start,dynamic adjustment of dead area and digital phase locked loop is designed,so as to the purpose of improving the ultra audio induction heating power digital control.The experimental tests show that the system possesses high efficiency,high reliability,high energy saving significantly and high practical value.