Title :
A soft switching class D current source inverter for induction heating with ferromagnetic load
Author :
Polsripim, Apisak ; Chudjuarjeen, Saichol ; Sangswang, Anawach ; Ayudhya, Piyasawat Navaratana Na ; Koompai, Chayant
Author_Institution :
Dept. of Electr. Eng., King Mongkut´´s Univ. of Technol. Thonburi, Bangkok, Thailand
Abstract :
A class D current source resonant inverter (CSRI) for induction heating power supplies for ferromagnetic load is proposed in this paper. The converter operates in zero-current switching mode. The switching devices are connected through the common ground and need only a single dc power supply for the gate driver circuitry. A small input inductor (500 ¿H) is used for shaping the line current with the aim of unity power factor operation on the line input. The operating frequency of the CSRI is automatically adjusted to maintain a small constant leading phase angle under load parameter variation. The maximum output power transferred to the load for this prototype is 1.26 kW. It can heat a 30-mm diameter and 150-mm long steel work-piece from room temperature to approximately 680°C within 10 minutes.
Keywords :
induction heating; invertors; power supplies to apparatus; ferromagnetic load; induction heating power supplies; load parameter variation; power 1.26 kW; size 150 mm; size 30 mm; soft switching class D current source inverter; time 10 min; unity power factor operation; zero-current switching mode; Driver circuits; Frequency; Inductors; Power generation; Power supplies; Reactive power; Resonant inverters; Switching circuits; Switching converters; Zero current switching; Soft switching; class D current source inverter; induction heating; parallel resonant;
Conference_Titel :
Power Electronics and Drive Systems, 2009. PEDS 2009. International Conference on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-4166-2
Electronic_ISBN :
978-1-4244-4167-9
DOI :
10.1109/PEDS.2009.5385898
