Method of and device for supplying electrical power to a load using a power modulation system including at least one controlled switch and overvoltage counting apparatus
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United States of America Patent
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Nov 2, 2004
Grant Date -
Aug 16, 2001
app pub date -
Dec 13, 2000
filing date -
Dec 14, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The operating mode of a power modulation system is determined according to the nature of the load. The power modulation system can operate in either of two operating modes, namely a 'reverse phase control' mode and a 'forward phase control' mode. To this end, the load is supplied with power under predetermined low-load operating conditions by the power stage in the 'reverse phase control' mode, overvoltages are detected and the power modulation system is caused to change to the 'forward phase control' operating mode if an excessive number of overvoltages is detected.
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