Power converter with automatic mode switching
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United States of America Patent
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Apr 24, 2012
Grant Date -
Aug 12, 2010
app pub date -
Feb 12, 2009
filing date -
Feb 12, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A power converter is provided that has an alternating-current (AC) to direct-current (DC) switched-mode power converter circuit that converts alternating-current power into direct-current power for powering an attached electronic device. Power can be conserved by automatically placing the power converter circuit in a low-power standby mode of operation whenever the electronic device is detached from the power converter. A monitoring circuit can be powered by a capacitor or other energy storage element while the power converter is operating in the standby mode. If the monitoring circuit detects an output voltage change that is indicative of attachment of the electronic device or if the storage element needs to be replenished, the monitoring circuit can place the power converter circuit in an active mode of operation.
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