Power factor control for an LED bulb driver circuit
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United States of America Patent
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-
Jun 2, 2015
Grant Date -
Oct 17, 2013
app pub date -
Jun 6, 2013
filing date -
Jun 7, 2011
priority date (Note) -
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Abstract
A light-emitting diode (LED) bulb has a shell and a base attached to the shell. An LED is within the shell. A driver circuit provides current to the LED. The driver circuit has a power factor control circuit that includes a tracking circuit configured to produce a tracking signal indicative of the voltage of the supply line. The power factor control circuit also includes a switch-mode power supply (SMPS) controller having an input pin and an output pin. The tracking circuit is connected to the input pin. Based on the signal at the input pin, the SMPS controller is configured to change a frequency of an output signal on the output pin.
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