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Electronic Ballast Compatible Lighting Driver for LED Lamps

A technology of light-emitting diodes and electronic ballasts, applied in the field of lighting drivers

Active Publication Date: 2017-09-22
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It's hard to get + / -10% LED current tolerance for such a circuit
[0011] That said, one of the challenges in providing TLED lamps for retrofitting existing fluorescent tube lamp lighting fixtures with electronic ballasts is providing an LED lighting driver that can be used with many LED lighting drivers designed for fluorescent tube lamps. An existing installed electronic ballast and operates reliably with LEDs with reasonable forward voltage variations

Method used

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  • Electronic Ballast Compatible Lighting Driver for LED Lamps
  • Electronic Ballast Compatible Lighting Driver for LED Lamps
  • Electronic Ballast Compatible Lighting Driver for LED Lamps

Examples

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Embodiment Construction

[0054] Solutions have been proposed for retrofitting tubular light emitting diode (LED) (TLED) lamps to existing fluorescent tube lamp lighting fixtures with electromagnetic (EM) ballasts. Some examples are described in US Provisional Patent Application 61 / 443,300, filed February 16, 2011, in the name of inventor William Jans et al., which is hereby incorporated by reference. However these solutions are not suitable for fluorescent tube lighting fixtures with electronic ballasts as described above.

[0055] Accordingly, the present inventors have recognized and understood the need to provide a method for retrofitting TLED lamps into existing fluorescent tube lamp lighting fixtures with electronic ballasts to replace existing fluorescent tube lamps while leaving the existing electronic ballasts. A solution would be helpful. Furthermore, it would be desirable to be able to retrofit the same TLED lamp into different lighting fixtures with a variety of different electronic ballasts...

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Abstract

A lighting driver comprising: a rectifier having an input connected to receive AC electrical power from an electronic ballast and having an output connected to supply current to a plurality of light emitting diodes (LEDs) arranged in series with one another in a string; and a switching device disposed at the output of the rectifier and configured to receive a switching control signal and perform a switching operation in response to the switching control signal to modulate the amount of power supplied to the plurality of LEDs so that an average value of the power supplied to the plurality of LEDs is equal to target power level. A current sensor may be provided to sense a current, and a controller configured to control a switching operation of the switching device in response to the sensed current may be provided.

Description

technical field [0001] The present invention generally relates to a lighting driver for driving one or more light emitting diode (LED) light sources. More specifically, the various inventive methods and apparatus disclosed herein relate to an LED-based lamp and associated lighting driver that can be retrofitted compatibly into lighting fixtures with electronic ballasts. Background technique [0002] There are many commercial settings (such as factories, shops, warehouses, etc.) that have a large number of lighting fixtures with installed fluorescent tubes (such as T8 or T12 tubes) and accompanying electronic ballasts. [0003] It should be noted that electronic ballasts differ from conventional electromagnetic (EM) ballasts in many ways. EM ballasts operate at line frequency (eg 50Hz or 60Hz), while electronic ballasts operate at significantly higher frequencies (eg 40kHz), thereby reducing visible flicker. Electronic ballasts are also generally more efficient, smaller and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/44Y02B20/30H05B45/3725H05B45/36H05B45/357H05B45/48
Inventor 陶海敏
Owner SIGNIFY HLDG BV