Title:
光線治療のための正弦波駆動システム及び方法
Document Type and Number:
Japanese Patent JP6659587
Kind Code:
B2
Abstract:
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.
Inventors:
Williams, Richard Kay
Rin, Ken Han
Shell, daniel
Leech, Joseph Pee
Rin, Ken Han
Shell, daniel
Leech, Joseph Pee
Application Number:
JP2016569560A
Publication Date:
March 04, 2020
Filing Date:
February 12, 2015
Export Citation:
Assignee:
Applied Biophotonics Limited
Williams, Richard Kay
Williams, Richard Kay
International Classes:
A61N5/06; A61N5/067; H01L33/00
Domestic Patent References:
| JP11192315A | ||||
| JP2012502696A |
Foreign References:
| US20090112296 | ||||
| WO1995007731A1 | ||||
| WO2013102183A1 |
Attorney, Agent or Firm:
Patent business corporation Oshima patent office