Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1995-02-10
1996-01-02
Pascal, Robert J.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315247, 327172, 327175, 327541, 331177R, H05B 3702
Patent
active
054811619
ABSTRACT:
A fixed duty ratio, variable frequency, square wave generator includes an astable multivibrator having a pair of resistors coupled in series between a supply voltage terminal and a capacitor, such as of a type implemented with a 555 timer, and further includes a JFET connected between the capacitor and ground. In a current-controlled version, the anode of a diode is connected to the gate of the JFET, and the cathode of the diode is connected to a sensing resistor for sensing current in a load. The multivibrator generates a ramp voltage across the capacitor which varies between predetermined fractions of the supply voltage with a fixed duty ratio. The capacitor of the multivibrator charges and discharges through the series connection of the resistors and the JFET channel resistance with charging and discharging times that vary with the input voltage to the JFET, thereby varying the generator frequency.
REFERENCES:
patent: 3956713 (1976-05-01), Ogawara
patent: 4823070 (1989-04-01), Nelson
patent: 5012161 (1991-04-01), Borowiec et al.
patent: 5083043 (1992-01-01), Yoshida
patent: 5373477 (1994-12-01), Sugibayashi
"555 Timer Applications Sourcebook, with Experiments" by Howard M. Berlin, 1978, pp. 27-33, 35 & 36.
Serial No. 08/386,572, "Multi-Resonant Boost For High Power Factor Circuit," S-A El-Hamamsy et al., filed Feb. 10, 1995.
El-Hamamsy Sayed-Amr
Kheraluwala Mustansir H.
Breedlove Jill M.
General Electric Company
Pascal Robert J.
Philogene Haissa
Snyder Marvin
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