Ripple removing circuit and LED control circuit applying the same
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United States of America Patent
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Mar 13, 2018
Issued Date -
N/A
app pub date -
Dec 9, 2016
filing date -
Aug 31, 2016
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A ripple removing circuit and an LED control circuit applying the same are described herein. The LED control circuit receives alternating current input, converts the input into direct current with ripples and supplies power for an LED load. The direct current with ripples is connected to a positive end of the LED load, a negative end of the load is connected to a first end of a regulation tube, and a second end of the regulation tube is grounded. A first capacitor is connected between a control end of the regulation tube and the ground, and the time constant of the filter circuit formed by the first capacitor, a current generating circuit and a current source is far greater than a power frequency period. The current flowing across the regulation tube is approximately a direct current free of ripples, thereby decreasing the current ripples going across the LED load.
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