제어로봇시스템학회:학술대회논문집

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Automatic frequency Control Current-Source Inverter for Forging Application

  • Chudjuarjeen, Saichol (Department of Electrical Engineering, King Mongkut’s University of Technology Thonburi) ;
  • Koompai, Chayant (Department of Electrical Engineering, King Mongkut’s University of Technology Thonburi) ;
  • Monyakul, Veerapol (Department of Electrical Engineering, King Mongkut’s University of Technology Thonburi)
  • Published : 2004.08.25
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Abstract

The paper describes an automatic frequency control current-fed inverter for forging applications. The IGBT in series with diodes as its switching devices in the inverter circuit which is of full-bridge type. The operating frequency is automatically tracked to maintain a small constant leading phase angle when load parameters change. The load voltage is controlled to protect the switches. The output power can be adjusted by varying the input current from phase controlled rectifiers which is a part of current source. The system has been operated at 15-17 kHz. The output power transferred to the load is 1,595 watts. It can heat the steel work pieces with 15 mm diameter and 120 mm long from room temperature to approximately 1100 $^{\circ}C$ within 20 seconds with 0.97 leading power factor on the input side.

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