High-Voltage Startup Method and Power Management Apparatus
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United States of America Patent
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Issued Date -
Jan 12, 2012
app pub date -
Jul 6, 2011
filing date -
Jul 9, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A high-voltage device provides a constant current drained from a high voltage source to charge a filter capacitor, where a voltage level of the higher voltage source is higher than 90 volts. When the operation voltage of the filter capacitor exceeds a first predetermined value, the charging of the filter capacitor by the constant current is stopped. A feedback loop is then used to maintain the operating voltage at substantially a second predetermined value lower than the first one.
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