Deflection supply voltage feedback control in conjunction with frequency change
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United States of America Patent
Stats
-
Apr 18, 2006
Grant Date -
Sep 29, 2005
app pub date -
Apr 16, 2003
filing date -
Apr 19, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A video display includes a scanner operable at a first frequency and a higher second frequency. A switch mode power supply drives a transformer with three secondaries. First and second rectifiers & filters are associated with the first and second secondaries. A rectifier is coupled to the third secondary and by way of a switch to the first filter. Feedback from the first filter controls the SMPS. In a first operating mode, the scanner is operated at the first frequency, the switch is open, the scanner supply is a first voltage from the first filter, and ancillary equipment is supplied with a third voltage by the second filter. In a second operating mode, the scanner is operated at the second frequency, the switch is closed, the scanner supply is a second voltage, higher than the first, from the first filter, and ancillary equipment is supplied with the same third voltage.
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