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Dimming circuit, dimming method and LED drive circuit

A dimming circuit and circuit technology, applied in the field of power electronics, can solve problems such as high cost and inability to use thyristor adjustment, and achieve the effect of good compatibility and cost reduction

Active Publication Date: 2017-05-31
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Provide a dimming circuit, a dimming method, and an LED drive circuit that use a thyristor dimmer to adjust color temperature, so as to solve the technical problems in the prior art that the thyristor cannot be used for adjustment and the cost is relatively high

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  • Dimming circuit, dimming method and LED drive circuit
  • Dimming circuit, dimming method and LED drive circuit
  • Dimming circuit, dimming method and LED drive circuit

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Embodiment Construction

[0026] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0027] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0028] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in a simplified form and use imprecise scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of ...

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PUM

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Abstract

The invention discloses a dimming circuit, a dimming method and an LED drive circuit. On the basis of the dimming of a dimming device, a plurality of current reference signals corresponding multiple loads are generated according to a dimming signal so as to change a proportion of each load current, so that the color temperature can be adjusted; and the dimming signal can be used for representing the exchange of a dimming device switch or the variation of a dimming speed and latching a proportion of each load current or latching a preset load current proportion. The color temperature can be adjusted directly by the dimming device without using an MCU, so that the compatibility is good, and the cost is decreased.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a dimming circuit, a dimming method and an LED driving circuit. Background technique [0002] Dimmers are widely used in the field of lighting. Taking a thyristor dimmer (TRIAC) as an example, by adjusting its conduction angle, the input voltage of the load is adjusted, and the load current changes accordingly to achieve dimming. In the process of replacing traditional light sources, LEDs are compatible with the application of thyristor dimming, so thyristor dimmers can also be used in LED drive circuits. [0003] In the prior art, although the thyristor dimmer realizes the dimming of the LED, in the application of color temperature adjustment, the color temperature cannot be adjusted by the thyristor dimmer. Such as figure 1 As shown in the figure, it shows the LED drive circuit of the prior art using the thyristor dimmer. LED1 and LED2 are two loads connected in par...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/14H05B45/40H05B45/00
Inventor 刘国强黄必亮何颖彦任远程周逊伟
Owner JOULWATT TECH INC LTD