Sinusoidal drive system and method for phototherapy

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United States of America Patent

PATENT NO 10328276
APP PUB NO 20150231408A1
SERIAL NO

14461147

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Abstract

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The LEDs in a phototherapy LED pad are controlled so that the intensity of the light varies in accordance with a sinusoidal function, thereby eliminating the harmonics that are generated when the LEDs are pulsed digitally, in accordance with a square-wave function. This is accomplished analogically by using a sinusoidal wave to control the gate of a MOSFET connected in series with the LEDs or by using a digital-to-analog converter to control the gate of the MOSFET with a stair step function representative of the values of a sinusoidal function at predetermined intervals. Alternatively, pulse-width modulation is used to control the gate of the MOSFET in such a way that the average current through the LEDs simulates a sinusoidal function. In additional to using a simple sine wave function, the LED current may also be controlled in accordance with “chords” containing multiple sine waves of different frequencies.

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Patent Owner(s)

  • APPLIED BIOPHOTONICS LTD.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Leahy, Joseph P Los Gatos, US 2 50
Lin, Keng Hung Chupei, TW 17 230
Schell, Daniel Los Gatos, US 12 157
Williams, Richard K Cupertino, US 343 14815

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