Low-loss resonant circuit for capacitance driver

Details Low-loss resonant circuit for capacitance driver Low-loss resonant circuit for capacitance driver

1994-11-09

1996-07-16

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

323288, H03H 100

Patent

active

055370217

ABSTRACT:
A fast lossless power MOSFET gate capacitance (C) driver uses a 3-winding transformer (T) to secure clamping (N, Vc, D) of the turn-on voltage level by coupling of the winding (N1) in the capacitance charging circuit to that (N) across the clamping potential (Vc) in series with a clamping diode (D). A similarly coupled winding (N2) in the discharging circuit can ensure clamping of the turn-off level, both rise and fall starting at zero current and being sinusoidal. Alternatively, a high Q constant current charge can be used with the charging circuit switch (S1) DC isolated from the capacitance and using the magnetising current built up in the transformer. Instead of clamping the turn-off level, the discharging circuit can be switched (S2) during magnetising current build-up (S1) using a separate inductance to reverse the capacitance voltage in a half-wave resonant circuit.

REFERENCES:
patent: 3614594 (1971-10-01), Rosa
patent: 3842341 (1974-10-01), Goldberg
patent: 4405975 (1983-09-01), Overstreet et al.
patent: 4524289 (1985-06-01), Hammond et al.
patent: 4584184 (1986-04-01), Higashino et al.
IEEE Power Electronics Specialists Conference Record, 1987, pp. 404-413, Zero-Voltage-Switched Quasi-Resonant buck and flyback Converters-Experimental results at 10 MHz. W. Tabisz, P. Gradzki, F. C. Lee.
Proceedings of the High Frequency Power Conversion Conference, pp. 438-445, ultra-fast isolated gate drive circuit, J. D. Repp, May 1989.
Theory and Design, G. Chryssis, McGraw-Hill Publishing Company, 1989. High-Frequency Switching Power Supplies, pp. 52-53.

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