Lamp driver with triac dimmer compensation
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United States of America Patent
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Jun 18, 2013
Grant Date -
N/A
app pub date -
May 24, 2010
filing date -
May 24, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A circuit for dimming a lamp is provided. The circuit includes a triac dimmer that adjusts the voltage level of an input AC waveform based on the setting of a dimmer switch. The output of the dimmer is provided to a power supply circuit that drives the lamp based on the voltage level at the dimmer output. The power supply circuit includes a compensation circuit that compensates for loss of dimmer output signal caused by the triac when the dimmer switch is adjusted for full output. The compensation circuit is configured to engage at dimmer output voltage levels between full power supply voltage and a voltage threshold. The voltage threshold may be based on the dimmer output voltage level when the dimmer switch is set for full output. The compensation circuit essentially disengages to allow the lamp to dim when the dimmer output voltage level falls below the threshold.
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