A High Color Rendering Index on Multichip LED Light Source

Autor:	Jen-Yu Shieh, Ming-Lei Chiu, Luke K. Wang
Rok vydání:	2012
Předmět:	Engineering business.industry Flyback converter General Engineering Electrical engineering LED circuit Signal Electronic switch law.invention Color rendering index law Electronic engineering Timer business Pulse-width modulation Light-emitting diode
Zdroj:	Circuits and Systems. :107-110
ISSN:	2153-1293 2153-1285
Popis:	Light source carrying a high color rendering index (CRI) finds potential applications in people’s everyday life as well as lighting industry. Combination of multi-wavelength LED light sources with designated direct emission sources can achieve warm-white and cool-white light. A generic design of high CRI multi-wavelength light-emitting-diode (LED) light source, using flyback converter, pulse width modulation (PWM) voltage control, variable resistor, and timer, is proposed. The PWM pulse is for the voltage control of cascade LEDs, while variable resistor manipulates the current flowing through LEDs. A design of dimming drive with cascade-connected electronic switch is also proposed. By adjusting the width of the dimming signal, the average value of forward current pulse can be changed, and therefore the objective, the tuning of the amount of light output, can be fulfilled. The advantage of the proposed design is its short response time.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0c746bb4e270bbfbfcee0de2293d44e2 https://doi.org/10.4236/cs.2012.31014 Zobrazit plný text záznamu