Method and apparatus for efficiently driving a low-voltage device from a wide-range input supply
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United States of America Patent
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Dec 23, 2003
Issued Date -
N/A
app pub date -
May 7, 2002
filing date -
May 7, 2002
priority date (Note) -
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Abstract
A method an apparatus for efficiently driving a low-voltage device from a wide-range input supply uses and inductor and a diode coupled in parallel to provide a high-efficiency energy storage circuit. The parallel diode/inductor circuit is coupled to a switch for intermittently supplying a current to maintain a level of energy storage in the circuit. The switch is coupled to a control circuit for controlling the switch. The external device be a relay and the inductor may be a coil of the relay. The external device may be one or more LEDs connected in series and the diode may be the series LED circuit. The control circuit may include a fault-tolerant synchronization input for connection to multiple driver circuits, whereby audible noise produced by beat frequencies between the relays is eliminated.
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