Power converter employing a multivibrator-inverter

Details Power converter employing a multivibrator-inverter Power converter employing a multivibrator-inverter

1991-05-06

1992-09-22

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315209CD, 315224, 315226, 315DIG7, H05B 3700

Patent

active

051500132

ABSTRACT:
A high efficiency, self-oscillating LC resonant multivibrator-inverter circuit employing a pair of switching transistor (Q1, Q2), two magnetically independent resonant inductors (L1, L2) and one common resonant capacitor (CR). Two secondary windings (NB2, NB1) of the resonant inductors provide feedback control for the switching transistors' bases, to provide intermittent feedback current to effect alternate and periodic conduction of the transistors. This results in the DC voltage rectified from the source S being converted to relatively high frequency AC voltage across output terminals (O1, O2). Such an arrangement enables construction of a cost effective, highly efficient, and highly reliable electronic ballast for fluorescent lamps.

REFERENCES:
patent: 4572989 (1986-02-01), Zuchtriegel
patent: 4709189 (1987-11-01), Kuchii
patent: 4782268 (1988-11-01), Fahnrich et al.
patent: 4959591 (1990-09-01), Hirschmann
patent: 5309919 (1991-08-01), Nilssen

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