Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1988-03-24
1989-12-05
Salce, Patrick R.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 26, 363134, H02M 3335
Patent
active
048856711
ABSTRACT:
A power supply for a Xenon lamp of a projection television includes a pulse-width-modulator that is included in a power regulating outer feedback loop and in a current-mode inner feedback loop. A current sensing transformer, responsive to a current in a chopper arrangement of the power supply, generates a signal that is coupled to a lowpass filter. The filter generates a ramping portion of each pulse of a control signal that is coupled to a current sensing terminal of the pulse-width-modulator. A switch operating synchronously with a horizontal sync signal is coupled across a capacitor of the lowpass filter to completely discharge the capacitor prior to the beginning of each ramping portion.
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A data sheet for the UC1846/1847 family of PWM control integrated circuit (IC) dated Dec., 1983, and published by Unitrode Corporation, Lexington, Mass., U.S.A., pp. 2-136 to 2-143.
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Checkovich Paul
General Electric Company
Peckman Kristine
Salce Patrick R.
Young Stephen A.
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