Power Supply Circuit for LED Lamp
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United States of America Patent
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Issued Date -
Jun 4, 2015
app pub date -
Nov 21, 2014
filing date -
Dec 4, 2013
priority date (Note) -
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Abstract
A power supply circuit for LED lamp includes a portable power source, an inductance energy storage module, a current sensing module, an on/off controlling module, a switch configured for turning on or turning off the inductance energy storage module via the on/off controlling module according to the current value sensed by the current sensing module, and a timer configured for controlling the on/off controlling module to regulate time span of turn off the inductance energy storage module so that the peak current of the inductance energy storage module has same value in each charging-discharging period thereof. The power supply circuit has constant output power regardless of how long the portable power supply is used and how much electric energy it has. Constant current is realized when the power supply circuit has a constant load.
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