Switching power supply with power feedback to keep lamp's brightness constant
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United States of America Patent
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Feb 25, 2014
Grant Date -
Oct 25, 2012
app pub date -
Apr 20, 2011
filing date -
Apr 20, 2011
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Abstract
A power supply and methods are provided. In one implementation, the power supply includes a switching converter with power feedback circuit to output constant power to keep lamp at constant brightness. The power feedback circuits include a current feedback circuit and a voltage feedback circuit. The power supply further includes a controller operable to adjust on time or duty cycle of main switch to keep the output power constant.
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