Dimming driver circuit and control method thereof
US10426005B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 2017 |
| Grant date | Sep 24, 2019 |
| Priority date | — |
| Expiry date | Apr 26, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/38
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control method for a dimming driver circuit is provided. Firstly, a detecting signal is generated according to a result of detecting a parameter of a power converting unit. Then, the dimming current is compared with a preset current threshold value. If the dimming current is higher than the preset current threshold value, a status information of a switch element of the power converting unit is determined according to the detecting signal, and a first setting is defined. If the dimming current is lower than or equal to the preset current threshold value, the status is determined according to the detecting signal, a pulse ratio in a chopping cycle is calculated, and a second setting is defined. According to the first setting or the second setting, an initial control signal is adjusted to a real control signal to control the switch element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.