Adaptive direct current (DC) to DC (DC-to-DC) light emitting diode (LED) driver for dynamic loads
US9485818B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2014 |
| Grant date | Nov 1, 2016 |
| Priority date | — |
| Expiry date | Dec 18, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Current spikes may occur when dynamically shortening a light emitting diode chain. These current spikes can be avoided by using a voltage control loop to regulate the output of the LED driver just prior to the transition period. Specifically, regulation of the LED driver is switched from a current control loop (e.g., a control loop regulating the output current of the led driver) to a voltage control loop (e.g., a control loop regulating the output voltage of the led driver) just before the LED chain is shortened. The voltage control loop then reduces the voltage of the LED driver to a target voltage prior to shortening the LED chain, thereby allowing the LED chain to be shortened without eliciting a current spike.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.