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Filter bandwidth adjustment in a multi-loop dimmer control circuit

A technology for controlling circuits and dimmers, which is applied to the layout of electric lamp circuits, light sources, electric light sources, etc., and can solve problems such as flickering, overshoot or undershoot of LED load current, and slow switching

Active Publication Date: 2014-06-18
DIALOG SEMICONDUCTOR GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Switching between driving the power circuit based on the dimmer signal and the current reference can also be sluggish and cause overshoot or undershoot of the LED load current supplied by the power circuit
Although the power circuit will eventually correct the overshoot or undershoot of the load current, the LED itself may flicker or produce other undesirable effects during this period as a result of the occasional load current behavior

Method used

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  • Filter bandwidth adjustment in a multi-loop dimmer control circuit
  • Filter bandwidth adjustment in a multi-loop dimmer control circuit
  • Filter bandwidth adjustment in a multi-loop dimmer control circuit

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Embodiment Construction

[0015] The drawings and the following description refer to various embodiments of the invention by way of example only. It should be noted from the following discussion that alternative embodiments of the structures and methods disclosed herein will readily be identified as feasible alternatives that may be employed without departing from the principles of the claimed invention.

[0016] Reference will now be made in detail to several embodiments, examples of which are illustrated in the accompanying drawings. Note that wherever possible, similar or identical reference numerals may be used in the figures and may indicate similar or identical functionality. The figures depict various embodiments for purposes of illustration only. Those skilled in the art will readily appreciate from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the invention described herein.

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PUM

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Abstract

The embodiments disclosed herein describe the adjusting of filter bandwidths in a multi-loop LED dimmer control circuit based on received dimmer input signals. The bandwidth of a filter in an active loop (a loop driving an LED power circuit) is decreased to prevent signal noise and associated LED flickering. Likewise, the bandwidth of a filter in an inactive loop (a loop not driving the LED power circuit) is increased to a pre-determined maximum in order to improve response time and decrease potential overshoot or undershoot during dimmer adjustment.

Description

technical field [0001] Embodiments disclosed herein relate generally to LED operation, and more particularly to filter bandwidth adjustment in multi-loop LED dimmer control circuits. Background technique [0002] Dimmable LED drivers typically perform two functions: adjusting the LED load current based on a dimmer signal describing the LED brightness level, and providing a constant load current if the dimmer signal describes the maximum brightness level. In one embodiment, the dimmer signal can directly modify the reference current in the LED load current control loop, so that the load current changes with the change of the dimmer signal. However, to maintain stability in such an implementation, the bandwidth in the LED load current control loop is limited. As a result, the dimming response may be sluggish, for example during rapid dimmer level adjustments. [0003] To improve the performance of the dimming response, the dimmer signal can additionally affect a pulse width ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H05B44/00
CPCH05B33/0815H05B33/0848H05B45/14H05B45/382H05B45/385
Inventor 王晓艳J·W·克斯特森C·C·潘冯光李海菊
Owner DIALOG SEMICONDUCTOR GMBH