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Detection and control of led power supply

A technology of LED driver and power supply, which is applied in the field of thermal management and can solve problems such as the increase of lamp heat limit

Inactive Publication Date: 2014-10-15
TERRALUX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, prior art techniques for merging heat and dim level parameters perform addition or multiplication; the disadvantage of this approach is that the end user can dim a hot lamp, As it cools down, the thermal limit of the lamp increases, and the addition and multiplication of the dimming level and the thermal limit causes the lamp to become brighter than the desired level

Method used

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  • Detection and control of led power supply
  • Detection and control of led power supply
  • Detection and control of led power supply

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Embodiment Construction

[0041] Figure 5 A block diagram 500 of various embodiments of the invention is shown. Transformer 502 receives a transformer input signal 504 and provides a transformer output signal 506 . Transformer 502 may be a magnetic transformer or an electronic transformer, and output signal 506 may be a low frequency (ie, less than or equal to about 120 Hz) AC signal or a high frequency (eg, greater than about 120 Hz) AC signal. Transformer 502 may, for example, be a 5:1 or 10:1 transformer providing a reduced 60 Hz output signal 506 (or output signal envelope if transformer 502 is an electronic transformer). LED module 508 receives transformer output signal 506 and converts transformer output signal 506 into a signal suitable for powering one or more LEDs 510 . According to an embodiment of the invention described in detail below, LED module 508 detects the type of transformer 502 and changes its behavior accordingly to provide constant power to LED 510 .

[0042] In various embod...

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Abstract

A type of circuit that detects the power supply that drives LEDs by analyzing the signal received from the power supply. The circuit controls the behavior of the LED based on the determined type, such as reaction to a dimmer or thermal conditions. Another embodiment dims the LED based on the duty cycle detected in the incoming power signal. A thermal management circuit, which detects the power of the LED, obtains the thermal working range of the LED and generates a control signal accordingly.

Description

[0001] related application [0002] This application claims priority and benefit to US Provisional Patent Application No. 61 / 261,991, filed November 17, 2009, the contents of which are hereby incorporated by reference in their entirety. technical field [0003] Embodiments of the present invention relate generally to LED light sources, particularly light sources using different types of power sources, and to dimmer control of LED light sources and thermal management of LED light sources. Background technique [0004] LED light sources (ie, LED lamps or more specifically LED "bulbs") can provide greater energy efficiency than traditional types of light sources, but typically require specialized circuitry to properly power the LEDs in the light source. The term LED light source, lamp and / or bulb as used herein refers to a system that includes an LED driver and supporting circuitry ("LED module") as well as the actual LED. In order to enable LED light sources to be widely use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00H05B45/50H05B45/59
CPCH05B33/0815H05B45/50H05B45/3575H05B45/38H05B45/375H05B45/3725H05B45/59
Inventor D·J·哈里森S·S·戴维斯
Owner TERRALUX