Dimming mode detection circuit, dimming mode detection method, non-dimming mode detection circuit and LED lighting system
US11382196B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2021 |
| Grant date | Jul 5, 2022 |
| Priority date | — |
| Expiry date | Mar 23, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/357
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dimming mode detection circuit for an LED lighting system that receives an alternating current input voltage and generates a bus voltage to drive an LED load, the dimming mode detection circuit including: a leading edge detection circuit configured to generate a leading edge detection signal by detecting a leading edge of a first voltage representative of the bus voltage in one sine half-wave cycle, in order to determine whether the LED lighting system operates in a leading edge dimming mode; and a trailing edge detection circuit configured to generate a trailing edge detection signal in accordance with a time length of a first interval from a first value of the first voltage in a previous sine half-wave cycle to a second value of the first voltage in a next sine half-wave cycle, in order to determine whether the LED lighting system operates in a trailing edge dimming mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.