ApplicationNo. 06/051090 filed on 06/22/1979
US Classes:363/56.09, Single-ended type323/289, With base drive control dissipation327/188, Minority carrier storage effect363/21.08, Having feedback winding inductively coupled to inverter inductive device (e.g., tertiary winding, etc.)363/21.1Utilizing pulse-width modulation
ExaminersPrimary: Shoop, William M.
Assistant: Wong, Peter S.
Attorney, Agent or Firm
International ClassesH02M 3/335 (20060101)
H02M 3/24 (20060101)
AbstractThe base electrode of the switching transistor in a converter is resistively connected to the output terminal of a pulse width modulator and connected through first and second series connected diodes to a ground reference potential which is also connected to the emitter of the transistor, the junction between the diodes being electrically connected through a large capacitor to the modulator output terminal. Voltage pulses at the output terminal cause the transistor to pass collector current and the second diode to conduct for charging the capacitor. On termination of voltage pulses, the modulator connects the output terminal thereof to ground. This causes the charge voltage on the capacitor to turn the first diode on to pull the base voltage sharply negative for rapidly drawing minority carriers out of the base region. This allows the base-emitter interelectrode capacitance of the switching transistor to discharge sooner for rapidly reducing the flow of collector current and decreasing power dissipation in the transistor during turnoff thereof.
Field of SearchWith transistor control means in the line circuit