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Active damping for dimmable driver for lighting unit

A light source and damping technology, which is applied in the field of damping devices, can solve the problems of reducing the working efficiency of lighting units, poor lighting, etc.

Inactive Publication Date: 2013-03-27
SIGNIFY HLDG BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the power consumed by the current flowing through the damping resistor is a lost power that does not produce light and thus reduces the operating efficiency of the lighting unit especially during those times when the light source is not dimmed and current spikes do not occur
Furthermore, this problem gets worse when these "next generation" light sources, such as LED light sources, are operated at greater power levels and thus increased current levels

Method used

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  • Active damping for dimmable driver for lighting unit
  • Active damping for dimmable driver for lighting unit
  • Active damping for dimmable driver for lighting unit

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Embodiment Construction

[0033] Applicants have recognized and understood that it would be beneficial to provide a driver for a light source, such as an LED light source, that can damp the large currents that may arise from a dimming circuit, while maintaining a simple damping resistor always present in the current path Compared with the situation in , it allows to achieve higher work efficiency. In view of the above, various embodiments and implementations of the present invention are directed to a driver for a lighting unit, such as an LED-based lighting unit, provided that the current in the driver exceeds a threshold value, such as A damping element damping the current in the driver during the time period as a result of a current spike), and it also includes a bypass path for bypassing the damping element during the time period when the current does not exceed the threshold.

[0034] Figure 1A and Figure 1B The operation of a leading edge dimmer (sometimes called a dimmer circuit) for a light s...

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Abstract

A circuit (236, 300, 400, 536) is provided for an apparatus (200, 500) configured to convert an AC signal to a DC signal for driving at least one light source (240, 540). The circuit includes a damping element (350, 450) configured to damp a current in the apparatus during time periods when the current exceeds a threshold, and a bypass path (340, 440) for bypassing the damping element during time periods when the current does not exceed the threshold.

Description

technical field [0001] The present invention is generally directed to lighting units and drivers for lighting units. More particularly, various inventive methods and apparatus disclosed herein relate to apparatus and methods for providing damping of high current levels generated in drivers for lighting units. Background technique [0002] Illumination devices based on semiconductor light sources such as light emitting diodes (LEDs) offer a viable alternative to traditional fluorescent, HID and incandescent lamps. Functional advantages and benefits of LEDs include high energy conversion and optical efficiency, durability, low operating costs, and many others. Recent advances in LED technology provide efficient and robust full-spectrum lighting units that allow a wide variety of lighting effects in many applications. Some lighting units feature one or more light sources including one or more LEDs capable of producing different colors, such as red, green, and blue, and a proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B33/0815H05B33/0887H05B45/37H05B45/3575H02M7/062H02H9/001H02M1/36H02M3/335H05B45/56H05B47/25
Inventor 乔海波关振源彭超孔剑虹魏天义江健
Owner SIGNIFY HLDG BV