公开(公告)号：US10328276B2

公开(公告)日：2019-06-25

申请号：US14461147

申请日：2014-08-15

Applicant: Applied BioPhotonics Limited

Inventor： Richard K. Williams ,  Keng Hung Lin ,  Daniel Schell ,  Joseph P. Leahy

IPC: A61N5/06 ,  A61B17/00

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.

公开(公告)号：US20150231408A1

公开(公告)日：2015-08-20

申请号：US14461147

申请日：2014-08-15

Applicant: Applied BioPhotonics Limited

Inventor： Richard K. Williams ,  Keng Hung Lin ,  Daniel Schell ,  Joseph P. Leahy

IPC: A61N5/06

CPC classification number: A61N5/06 ,  A61B2017/00159 ,  A61N2005/0626 ,  A61N2005/0629 ,  A61N2005/0652

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.

Abstract translation: 控制光疗LED垫中的LED，使得光的强度根据正弦函数而变化，从而消除了当LED以数字方式脉冲数时产生的谐波，根据方波函数。 这是通过使用正弦波来控制与LED串联连接的MOSFET的栅极或者通过使用数模转换器来控制具有代表a的值的阶梯函数的MOSFET的栅极来实现的 以预定间隔进行正弦函数。 或者，使用脉冲宽度调制来控制MOSFET的栅极，使得通过LED的平均电流模拟正弦函数。 除了使用简单的正弦波功能之外，还可以根据包含多个不同频率的正弦波的“和弦”来控制LED电流。