CURRENT BALANCING CIRCUITS FOR LIGHT-EMITTING-DIODE-BASED ILLUMINATION SYSTEMS

摘要

A system includes first, second, and third sets of LEDs and a control module. The first set of LEDs outputs light having wavelengths in a wavelength range in a spectrum of ultraviolet light and is coated with a phosphor to convert the ultraviolet light to blue light having wavelengths in a wavelength range in a spectrum of blue light. The second and third sets of LEDs output light having wavelengths in a wavelength range in the spectrum of blue light and is coated with phosphors to convert the blue light to light having wavelengths in a wavelength range in a spectrum of green, yellow, and red light. The second set of LEDs generates less red light than green light. The third set of LEDs generates less green light than red light. The current control module controls currents through the first, second, and third sets of LEDs to generate white light.

主权项

1. A system comprising:
a first set of light emitting diodes configured to output light having wavelengths in a wavelength range in a spectrum of ultraviolet light, wherein the first set of light emitting diodes is coated with a phosphor configured to convert the ultraviolet light to blue light having wavelengths in a wavelength range in a spectrum of blue light; a second set of light emitting diodes configured to output light having wavelengths in a wavelength range in the spectrum of blue light, wherein the second set of light emitting diodes is coated with phosphors configured to convert the blue light to light having wavelengths in a wavelength range in a spectrum of (i) green light, (ii) yellow light, and (iii) red light, and wherein the second set of light emitting diodes is configured to generate less red light than green light; a third set of light emitting diodes configured to output light having wavelengths in a wavelength range in the spectrum of blue light, wherein the third set of light emitting diodes is coated with phosphors configured to convert the blue light to light having wavelengths in a wavelength range in a spectrum of (i) green light, (ii) yellow light, and (iii) red light, and wherein the third set of light emitting diodes is configured to generate less green light than red light; and a current control module configured to control currents through the first, second, and third sets of light emitting diodes to generate white light.