Method and apparatus for increasing dimming range of solid state lighting fixtures

A solid-state lighting and dimming technology, applied in lighting devices, light sources, electric light sources, etc., can solve the problem of not being able to remove the LED load

Active Publication Date: 2013-01-09
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, conventional phase chopping dimmers may have minimum load requirements such that the LED load cannot be simply removed from the circuit

Method used

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  • Method and apparatus for increasing dimming range of solid state lighting fixtures
  • Method and apparatus for increasing dimming range of solid state lighting fixtures
  • Method and apparatus for increasing dimming range of solid state lighting fixtures

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Embodiment Construction

[0029] In the following detailed description, representative embodiments for disclosing specific details are set forth for the purpose of explanation and not limitation, so as to provide a thorough understanding of the teachings herein. However, for those of ordinary skill in the art who benefit from the disclosure herein, other embodiments based on the teachings herein that are different from the specific details disclosed herein still fall within the scope of the appended claims. In addition, descriptions of well-known devices and methods may be omitted so as not to obscure the description of the representative embodiments. The method and device clearly fall within the scope of the teachings herein.

[0030] The applicant recognizes and understands that, especially when the minimum load requirements of the phase chopper dimmer are met, it would be beneficial to provide a device and method for reducing the minimum output light level that would otherwise pass This is achieved wi...

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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.

Description

Technical field [0001] The present invention relates generally to the control of solid state lighting fixtures. More specifically, the various inventive methods and devices disclosed herein involve the use of bleeder circuits to selectively increase the dimming range of solid state lighting fixtures. Background technique [0002] Digital or solid-state lighting technology, that is, lighting based on semiconductor light sources (such as light-emitting diodes (LED)) provides a viable alternative to traditional fluorescent, HID, and incandescent lamps. The functional advantages and benefits of LEDs include high energy conversion and optical efficiency, durability, low operating costs, and so on. Recent advances in LED technology have provided effective and robust full-spectrum light sources that support a variety of lighting effects in many applications. Some lamps embodying these light sources are characterized by a lighting module that includes one or more LEDs capable of produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B33/0815H05B33/0824H05B45/44H05B45/37H05B47/10H05B45/10H05B45/3575H05B45/325
Inventor M·戴塔G·坎普贝尔M·雷宾纳
Owner SIGNIFY HLDG BV
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