A PWM dimming method and PWM dimming device

A technology of dimming device and PWM signal, applied in lighting devices, light sources, electric light sources, etc., can solve the problems of reducing the number of dimming levels, ripples, and stroboscopic flicker of LED light sources, and achieve the effect of dimming precision

Active Publication Date: 2018-01-19
OPPLE LIGHTING
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  • Claims
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Problems solved by technology

[0004] Due to the above working principle of PWM control, there is a contradiction. If you want to increase the dimming level, you should reduce the frequency of the PWM signal. However, when the PWM frequency is low, the LED light source is prone to flicker. When , you will see obvious ripples
On the contrary, although the increase of PWM frequency will reduce the stroboscopic ripple problem, the negative impact is that the number of dimming levels will be reduced, and then the fineness of dimming will become lower, resulting in brightness changes during the dimming process. It is not smooth enough, and the light source may even feel flickering visually

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  • A PWM dimming method and PWM dimming device
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Embodiment Construction

[0043] A PWM dimming method and a PWM dimming device proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] Please refer to figure 2 , figure 2 Shown is a schematic structural diagram of a preferred embodiment of a PWM dimming device proposed by the present invention, the PWM dimming device includes a dimming signal interface circuit 1, a control circuit 2, a drive circuit 3, and a drive circuit output interface circuit 4 . The dimming signal interface circuit 1 receives the dimming control signal from the outside and transmits it to the control circuit 2 , the control circuit 2 analyzes the dimming control signal, generates a control signal and transmits it to the driving circuit 3 . The control signal is composed of multiple PWM signals with a specific duty ratio corresponding to the dimming control signal, and is output in a loop. The driving circuit outputs the correspon...

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Abstract

The invention provides a PWM light modulation method and device. A plurality of PWM periods are combined into a control signal, so as to achieve the control of the brightness of illumination equipment. After the above design is employed, the light modulation precision cannot be affected while the frequency of a PWM signal is improve. Through the change of a combined scheme, more light modulation levels can be obtained, thereby achieving higher light modulation precision and a more smooth and flexible light modulation effect.

Description

technical field [0001] The invention relates to a PWM dimming method and a PWM dimming device. Background technique [0002] With the rapid development of LED technology, more and more LED light sources have replaced traditional light sources. As we all know, LED has many advantages as a light source, and easy dimming and color adjustment is one of the biggest advantages of LED. With the development and promotion of the Internet of Things and smart homes, there are more and more demands for light source dimming, and the quality requirements for dimming are also getting higher and higher. Therefore, LED dimming technology needs to be continuously improved in order to give full play to its own advantages and follow the development trend of smart home. [0003] At present, the most commonly used LED dimming method is PWM dimming. The principle is to use the PWM signal to control the Buck / Boost switching power supply circuit, and output the corresponding voltage and current va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
CPCY02B20/40
Inventor 张俊于同华
Owner OPPLE LIGHTING
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