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- Title
Parameterised LED current regulator for pulse width modulation switch delay for accurate colour mixing in multi-LED light sources.
- Authors
Wu, C-C; Hu, N-C; Chen, J-N; Chang, H-I
- Abstract
Multi-LED colour mixing light sources are increasingly being used in lighting. The method used to set the dimming signal needs to accurately achieve and sustain the desired colour temperature and high colour rendering index (CRI). A pulse width modulation (PWM) signal is always used in LED colour mixing. But the PWM switch state creates a time delay in the multi-LED current regulator, resulting in a colour difference. A modified PWM signal to accurately maintain the desired colour temperature and a high CRI is derived from a parameterised LED current regulator switch state, using curve fitting. The modified PWM signal can be calculated from reconstructed coefficients of the illuminant spectrum.
- Subjects
LIGHT emitting diodes; COLOR mixing; PULSE amplitude modulation; COLOR temperature; ELECTRIC current regulators
- Publication
Lighting Research & Technology, 2014, Vol 46, Issue 2, p171
- ISSN
1477-1535
- Publication type
Article
- DOI
10.1177/1477153512469622