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LED drive device, controller thereof and dimming mode detection method

A technology of LED driving and dimming mode, applied in measuring devices, lighting devices, energy-saving control technology, etc., can solve problems such as high cost, LED flickering, and adverse effects on the performance of LED driving devices

Inactive Publication Date: 2014-09-03
CHENGDU MONOLITHIC POWER SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the working principles of each dimming situation are quite different, if the LED driver cannot distinguish between these dimming situations and work in different modes as needed, it will not be well compatible with dimmers
The performance of the LED driver will be adversely affected and may even cause the LED to flicker
[0004] Existing dimming mode detection schemes are usually based on digital technology, which is complex in structure and high in cost

Method used

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  • LED drive device, controller thereof and dimming mode detection method
  • LED drive device, controller thereof and dimming mode detection method
  • LED drive device, controller thereof and dimming mode detection method

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Embodiment Construction

[0022] Specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described here are only used for illustration and are not used to limit the present invention. In the following description, in order to provide a thorough understanding of the present invention, numerous specific details are set forth. However, it is obvious to a person of ordinary skill in the art that it is not necessary to adopt these specific details to implement the present invention. In other instances, in order to avoid obscuring the present invention, well-known circuits, materials or methods are not specifically described.

[0023] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "example" mean that a specific feature, structure, or characteristic described in conjunction with the embodiment or example is included in the present invention In at least one embodiment. Therefore, the phrases "in one...

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Abstract

The invention discloses an LED drive device, a controller of the LED drive device and a dimming mode detection method. The dimming mode detection method comprises the steps that direct current bus voltages are sampled to generate voltage sampling signals; the rise time needed by the voltage sampling signals increasing from a second threshold value to a first threshold value is compared with a first time threshold value so as to judge whether the LED drive device is connected to a front cut dimmer or not; the fall time needed by the voltage sampling signals reduced from a third threshold value to a fourth threshold value is compared with a second time threshold value so as to judge whether the LED drive device is connected to a back cut dimmer or not; if whether the LED drive device is connected to the front cut dimmer or the back cut dimmer is not detected within preset duration, the LED drive device is not connected to the dimmers.

Description

Technical field [0001] The embodiments of the present invention relate to electronic circuits, and in particular, to an LED driving device and its controller and a dimming mode detection method. Background technique [0002] Nowadays, replacing traditional incandescent lamps with LEDs (light emitting diodes) has become a major trend in the development of lighting technology. However, how to make LED driving devices compatible with dimmers in traditional applications is a difficult problem. [0003] There are two commonly used dimmers: leading edge dimmer and trailing edge dimmer. In some cases, the dimmer will be removed and the LED driver is not connected to any dimmer at this time. In other words, there are three different dimming situations: front-cut dimming, back-cut dimming and no dimming. Since the working principles of each dimming situation are completely different, if the LED driving device cannot distinguish these dimming situations and work in different modes as requi...

Claims

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Application Information

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IPC IPC(8): G01R31/00H05B37/02H05B44/00
CPCY02B20/42H05B45/10Y02B20/30H05B45/3725H05B45/385H05B45/14
Inventor 邝乃兴蔡家利冯林
Owner CHENGDU MONOLITHIC POWER SYST
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