Invention Grant
- Patent Title: Method and apparatus for increasing dimming range of solid state lighting fixtures
-
Application No.: US15245327Application Date: 2016-08-24
-
Publication No.: US09622315B2Publication Date: 2017-04-11
- Inventor: Michael Datta , Gregory Campbell , Mark Rabiner
- Applicant: PHILIPS LIGHTING HOLDING B.V.
- Applicant Address: NL Eindhoven
- Assignee: PHILIPS LIGHTING HOLDING B.V.
- Current Assignee: PHILIPS LIGHTING HOLDING B.V.
- Current Assignee Address: NL Eindhoven
- Main IPC: H05B37/02
- IPC: H05B37/02 ; H05B33/08

Abstract:
A device for controlling levels of light output by a solid state lighting load at low dimming levels includes a bleed circuit connected in parallel with the solid state lighting load. The bleed circuit includes a resistor and a transistor connected in series, the transistor being configured to turn on and off in accordance with a duty cycle of a digital control signal when a dimming level set by a dimmer is less than a predetermined first threshold, decreasing an effective resistance of the bleed circuit as the dimming level decreases.
Public/Granted literature
- US20160366743A1 METHOD AND APPARATUS FOR INCREASING DIMMING RANGE OF SOLID STATE LIGHTING FIXTURES Public/Granted day:2016-12-15
Information query