Pulse-by-pulse current mode controlled power supply
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United States of America Patent
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-
Dec 5, 1989
Grant Date -
N/A
app pub date -
Mar 24, 1988
filing date -
Mar 24, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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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