Switching-Mode BJT Driver for Self-Oscillated Push-Pull Inverters


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BÖREKCİ S., ÖNCÜ S.

JOURNAL OF POWER ELECTRONICS, cilt.12, ss.242-248, 2012 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 12 Konu: 2
  • Basım Tarihi: 2012
  • Doi Numarası: 10.6113/jpe.2012.12.2.242
  • Dergi Adı: JOURNAL OF POWER ELECTRONICS
  • Sayfa Sayısı: ss.242-248

Özet

Self oscillating current fed push pull resonant inverters can be controlled without using special drivers. Dc current flows through the choke coil and the power switches, although the driving signals of the power switches are sinusoidal. When the base current is near zero, the transistors cannot be operated in switching mode. Hence higher switching power losses and instantaneous peak power during off transitions are observed. In this study, an alternative design has been proposed to overcome this problem. A prototype circuit has been built which provides dc bias current to the base of the transistors. Experimental results are compared with theoretical calculations to demonstrate the validity of the design. The proposed design decreases the peak and average power losses by about 8 times, when compared to conventional designs.