The eddy current loss and hysteresis loss method of induction heating is the use of high frequency electromagnetic field generated in the metal inside the heating metal, power equipment resulting in high frequency electromagnetic field is known as the high frequency induction heating equipment. For many years, high frequency induction heating power supply are used in electronic tube oscillator DC high voltage conversion frequency current generates an electromagnetic field, in recent years, due to the development of semiconductor power devices, the use of semiconductor power devices instead of electron tubes to realize DC to high frequency current.