Transformer replacement for a solid-state lighting ballast

Details Transformer replacement for a solid-state lighting ballast Transformer replacement for a solid-state lighting ballast

1994-10-28

1996-04-02

Pascal, Robert J.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315244, 315224, 315DIG7, H05B 3702

Patent

active

055044018

ABSTRACT:
A transformer-less electronic ballast for a gas-discharge lighting system having a power amplifier, with an input, driving a gas-discharge lamp in combination with reactive elements to form a resonant load. The lighting system includes a resistor for sensing current flowing in the resonant load, a comparator having an output coupled to the input of the power amplifier, a non-inverting input coupled to the resistor, and an inverting input coupled to the output of a ramp generator, polarity of the ramp signal being dependent on the output of the comparator. The comparator generates a first signal that is amplified by the power amplifier and applied to the load. The ramp generator generates a ramp signal in response to the first signal. The first signal is asserted by the comparator when the sensed current flowing in the load differs from the ramp signal.

REFERENCES:
patent: 3999100 (1976-12-01), Dendy et al.
patent: 4039897 (1977-08-01), Dragoset
patent: 5329209 (1994-07-01), Nepote
"Telefunken Application Note", (Date Unknown) pp. 1 through 6.
"Electronic Ballasts", PCIM, Apr. 1987, R. J. Haver, Motorola, Inc., pp. 52 through 56 and 58.
"International Rectifier Application Note 973", (Date Unknown) Peter N. Wood, pp. 229 through 236.
"1.9 Electronic ballast for fluorescent lamps", Siemens (:), (Date Unknown) p. 34.

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