Averaging circuit, LED driving device and control method thereof

A technology of LED driving and averaging, applied in lighting devices, electric light sources, electrical components, etc., can solve the problems of increased number of control chip pins, unfavorable circuit integration, increased chip cost and area, etc., to improve integration and save The effect of externally connecting large capacitors and reducing the number of pins

Pending Publication Date: 2018-07-20
HANGZHOU SILAN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thyristor dimming LED drive device requires an external large capacitor for low-frequency filtering, resulting in an increase in the number of pins of the control chip, as well as an increase in the cost and area of ​​the chip, which is also unfavorable for circuit integration.

Method used

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  • Averaging circuit, LED driving device and control method thereof
  • Averaging circuit, LED driving device and control method thereof
  • Averaging circuit, LED driving device and control method thereof

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Embodiment Construction

[0063] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the various figures, identical elements are indicated with similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale. Also, some well-known parts may not be shown.

[0064] In the following, many specific details of the present invention are described, such as device structures, materials, dimensions, processing techniques and techniques, for a clearer understanding of the present invention. However, the invention may be practiced without these specific details, as will be understood by those skilled in the art.

[0065] The invention can be embodied in various forms, some examples of which are described below.

[0066] figure 2 A schematic block diagram of the thyristor dimming system according to the first embodiment is shown. The thyristor dimming system includes a thyristor dimmer TRIAC and an...

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PUM

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Abstract

The invention discloses an averaging circuit, an LED driving device and a control method thereof. The averaging circuit comprises a first counter, a second counter and a first digital-to-analog conversion module. The first counter is used for receiving a first dimming signal including the conduction angle information of a thyristor dimmer, and counting the first dimming signal in each power frequency period to acquire a first count value used for characterizing the conduction angle. The second counter is connected with the first counter, and maintains the first count value in each power frequency period. The first digital-to-analog conversion module is connected with the second counter, and is used for converting the first count value into a second dimming signal. The second dimming signalis a first direct current voltage signal. The averaging circuit uses the counter to acquire the dimming signal corresponding to the conduction angle of the thyristor dimmer. A large capacitor is eliminated. The integration level of a control chip is improved, and the cost of the control chip is reduced.

Description

technical field [0001] The present invention relates to light source control technology, and more specifically, to an average value circuit, an LED driving device and a control method thereof. Background technique [0002] When a light-emitting diode (light-emitting diode, LED) is used in the lighting field, an LED dimming device is used to adjust the brightness to meet the individual needs of users or adjust the light according to environmental requirements to reduce energy consumption. The brightness and color temperature of the LED can be adjusted by using the LED dimming device to meet the needs of users. [0003] The LED dimming device adopts, for example, a traditional thyristor dimmer. The basic principle of thyristor dimming is to cut the phase of external input voltage by controlling the conduction angle of thyristor, so as to adjust the power supply voltage of LED lamp load to achieve the purpose of dimming. [0004] A thyristor dimming system according to the pr...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37
Inventor 陈华捷谢小高
Owner HANGZHOU SILAN MICROELECTRONICS
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