Driving circuit and driving method for a plurality of LED strings
US9769888B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 2016 |
| Grant date | Sep 19, 2017 |
| Priority date | — |
| Expiry date | May 6, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A constant current driving circuit can include: LED strings; a voltage regulator configured to provide an output voltage signal as a supply for the LED strings; current regulating circuits corresponding to the LED strings, and being coupled between the LED strings and ground, where the current regulating circuits are configured to regulate currents through the LED strings according to present currents and reference current signals; a voltage feedback circuit configured to receive input voltage signals of the current regulating circuits, and to select a voltage feedback signal for controlling the output voltage signal according to the voltage feedback signal and a reference voltage signal; and a signal generating circuit corresponding to the current regulating circuits, where each signal generating circuit receives an input voltage signal of a corresponding current regulating circuit, and generates an error amplifying signal according to the input voltage signal and the reference voltage signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.