Soft start circuit for self-oscillating drivers

Details Soft start circuit for self-oscillating drivers Soft start circuit for self-oscillating drivers

1996-06-28

1998-08-18

Lee, Benny

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315209R, 315272, 315291, 315307, 315DIG7, H05B 3702

Patent

active

057962154

ABSTRACT:
A half bridge driver chip for driving a resonant load, such as a ballast, has first and second pairs to which an oscillation frequency timing circuit, matched to the resonant frequency of the load. A constant voltage drop circuit is connected to these input pins to vary the voltage at the pins as a linear function of the input voltage V.sub.cc. Consequently, when V.sub.cc is increasing during the start-up of the circuit, the resonant frequency is initially high but decreases to its operation value as V.sub.cc increases. This produces a soft start characteristic and a timed preheat cycle of the resonant load. In one embodiment, the constant voltage drop circuit is a zener diode; in another embodiment, it is strings of anti-parallel connected diodes.

REFERENCES:
patent: 4104715 (1978-08-01), Lawson, Jr.
patent: 4186434 (1980-01-01), Cowett, Jr.
patent: 4233558 (1980-11-01), Gaertner
patent: 4277726 (1981-07-01), Burke
patent: 4560851 (1985-12-01), Tsukamoto et al.
patent: 4682039 (1987-07-01), Ragle
patent: 4855649 (1989-08-01), Masaki
patent: 4862039 (1989-08-01), Kile et al.
patent: 4999545 (1991-03-01), Summer
patent: 5015921 (1991-05-01), Carlson et al.
patent: 5030887 (1991-07-01), Guisinger
patent: 5051662 (1991-09-01), Counts
patent: 5140224 (1992-08-01), Kakitani et al.
patent: 5268830 (1993-12-01), Loftus, Jr.
patent: 5274543 (1993-12-01), Loftus, Jr.
patent: 5305191 (1994-04-01), Loftus, Jr.
patent: 5331253 (1994-07-01), Counts
patent: 5363020 (1994-11-01), Chen et al.
patent: 5369340 (1994-11-01), Leyten
patent: 5416386 (1995-05-01), Nilssen
patent: 5426350 (1995-06-01), Lai
patent: 5428267 (1995-06-01), Peil
patent: 5449981 (1995-09-01), Auld, Jr. et al.
patent: 5451841 (1995-09-01), Dunn et al.
patent: 5475285 (1995-12-01), Konopka
patent: 5477112 (1995-12-01), Lesea
patent: 5519289 (1996-05-01), Katyl et al.
patent: 5550436 (1996-08-01), Houk
patent: 5612597 (1997-03-01), Wood

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