Dimming circuit and dimming control method
US11665794B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2019 |
| Grant date | May 30, 2023 |
| Priority date | — |
| Expiry date | Jul 9, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/2176
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dimming circuit includes a DC/DC conversion unit and a control module. The control module provides a switching period reference, and samples an input voltage and an output voltage. The control module calculates a turn-on time according to the input voltage, the output voltage and a reference current signal. The control module generates a variation period signal which is cyclically-changed. The variation period signal is combined with the switching period reference or the turn-on time. Consequently, a pulse width modulation signal cyclically changed is generated by the switching period reference, the turn-on time and the variation period signal. Since the switching periods is cyclically changed, the average of the output current is close to the ideal value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.