LED controllers, drivers and lighting circuits
US9433049B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 1, 2015 |
| Grant date | Aug 30, 2016 |
| Priority date | — |
| Expiry date | Dec 1, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/375
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A controller for controlling a plurality of LED lighting strings is disclosed, the controller comprising, for each of the plurality of LED lighting strings: a frequency modulator configured to modulate a baseline frequency to generate a time-vary modulated frequency, wherein the frequency modulator is configured to modulate the baseline frequency by a jitter superposed on a regular repeating pattern which varies more slowly than the jitter, to result in the modulated frequency; and a modulated PWM signal generator configured to generate a modulated PWM signal having the modulated frequency and a predetermined duty cycle; wherein the regular repeating patterns for the PWM signals are spaced apart in phase. Associated drivers, LED lighting circuits and methods are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.