Light emitting element drive device
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United States of America Patent
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Sep 8, 2015
Grant Date -
Jul 25, 2013
app pub date -
Jan 18, 2013
filing date -
Jan 19, 2012
priority date (Note) -
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Abstract
A light emitting element drive device with PWM dimming includes an LED module, a power conversion circuit that supplies electric power to the LED module, a dimming switch element that performs an open/close operation for a path in which a current flows in the LED module, and a voltage detection circuit that detects a voltage value of a voltage that is output from the power conversion circuit. When the dimming switch element is turned ON, a control circuit performs feedback control so as to make a current value of the current close to a first target value. When the dimming switch element is turned OFF, the control circuit performs feedback control so as to make the voltage value close to a second target value. Wherein, the first target value is a predetermined value and the second target value is set based on the voltage value.
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