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Dimming depth consistency control circuit

A control circuit and consistency technology, applied in the direction of electrical components, etc., can solve problems such as inconsistency in light and dark dimming depth, PWM dimming circuit light flicker, voltage noise, etc.

Inactive Publication Date: 2021-11-26
NINGBO KLITE ELECTRIC MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to overcome the problems of light flickering, voltage noise, and inconsistency of light and dark dimming depth in the PWM dimming circuit in the prior art, and provides a dimming depth consistency control circuit

Method used

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Embodiment Construction

[0023] The technical solutions of the present invention will be further described in detail below through examples and in conjunction with the accompanying drawings.

[0024] like figure 2 shown in:

[0025] Rectifier module, filter circuit, constant current dimming module and dual color temperature conversion module, rectifier module and filter circuit are connected in series, filter circuit and constant current dimming module are connected in series, dual color temperature conversion module and constant current dimming module are connected in parallel, in the original PWM to analog Based on the control, it is divided into two control modes.

[0026] In the dimming depth consistency control circuit, the rectifier module is the rectifier bridge BS11, the mains input terminal L is connected to node 1 of the rectifier bridge BS11, the ten-point input terminal N is connected to the 3rd node of the rectifier bridge BS11, the 4th node is grounded, and the 2nd node is connected to...

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Abstract

The invention discloses a dimming depth consistency control circuit which comprises a rectifier module, a filter circuit, a constant-current dimming module and a double-color-temperature conversion module, wherein the rectifier module and the filter circuit are connected in series, the filter circuit and the constant-current dimming module are connected in series, the double-color-temperature conversion module and the constant-current dimming module are connected in parallel, a first control mode and a second control mode are set, the first control mode realizes dimming in a range of 100%-10%, and the second control mode realizes dimming in a range of 10%-0%. The working current of the chip is extremely low, auxiliary winding detection and power supply are not needed, and the cost and size of a circuit system are saved; and the dimming depth is large, the minimum dimming range is lower than 3%, and the minimum dimming depths between the lamps are consistent.

Description

technical field [0001] The invention relates to a control circuit, in particular to a dimming depth consistency control circuit. Background technique [0002] After several years of development, LED dimming technology has gradually evolved from traditional thyristor dimming to PWM dimming. The traditional LED grayscale algorithm display system has many problems, such as low refresh frequency, afterimage, and uneven display. Wait. In practical applications, it is necessary to put forward higher requirements for the LED driver. It is hoped that the LED driver can not only support the adjustment of brightness, but also meet the requirements of high-quality images and accurately reproduce the full color spectrum required for full-motion video. [0003] The PWM signal duty cycle has a linear relationship with the luminous flux, while the human eye's perception of brightness changes is nonlinear. Therefore, it is necessary to introduce a non-linear correction technology to compe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B45/10H05B45/20H05B45/345H05B45/36H05B45/325H05B45/37H05B45/34H05B47/19
CPCH05B45/10H05B45/20H05B45/345H05B45/36H05B45/325H05B45/37H05B45/34H05B47/19
Inventor 姚斌雄
Owner NINGBO KLITE ELECTRIC MFG
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