Optimal power supply topologies for switched current-driven LEDs
US8823284B2 · kind B2 · utility
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Key dates
| Filing date | Nov 10, 2011 |
| Grant date | Sep 2, 2014 |
| Priority date | — |
| Expiry date | Jul 11, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Optimal power supply topologies that do not use output bulk capacitors as well as freewheeling diodes in output section to therefore provide efficiency, cost, volume, and weight advantage over the existing solutions. The present invention applies a pulse-width modulated switched current at higher frequency (in order of 10 to 100 kHz) to LEDs without degrading optical performance. LEDs' average current control is attained using a feedback loop that senses the average value of LEDs' current and controls the current by varying the pulse width of applied current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.