SCR dimming circuit and dimming control method
US9325254B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2014 |
| Grant date | Apr 26, 2016 |
| Priority date | — |
| Expiry date | Nov 18, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A silicon-controlled rectifier (SCR) dimming circuit and a dimming control method are disclosed. The SCR dimming circuit includes a SCR element, a rectifier circuit, a filter circuit, a power converter, and a dimming control circuit. The dimmer control circuit includes a phase angle detection circuit, an output current feedback control circuit, an input current control circuit, a maximum operation time detection circuit, and a logic operator. An input current sampling signal fluctuates near a predetermined value after the SCR element is turned off by turning on and off the power converter, so that the input AC current is less than a holding current of the SCR element. The present SCR dimming circuit and the present dimming control method can avoid repeatedly turning on the SCR element in cycles of an operating frequency. Thus, the linearity of dimming is improved and the flicker of an LED lamp is eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.