A pwm dimming method for led

A dimming and dimming level technology, applied in the direction of light source, electric light source, electroluminescent light source, etc., can solve the problems of insufficient dimming level, non-linearity, uneven dimming, etc., achieve soft dimming, increase dimming Level, uniform dimming effect

Active Publication Date: 2019-09-20
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In the PWM dimming mode, if you simply change the duty cycle to adjust the brightness of the LED without any processing, then the step feeling of the lamp is more obvious when it changes color, and it is accompanied by a slight jitter phenomenon. Therefore, for the human eye, The PWM dimming method has the disadvantages of uneven dimming, non-linear perception by the human eye, and insufficient dimming levels.

Method used

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  • A pwm dimming method for led
  • A pwm dimming method for led
  • A pwm dimming method for led

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] Such as figure 1 The PWM dimming method of the LED is used to adjust the PWM wave output by the single-chip microcomputer, and the LED is connected with the PWM wave output end of the single-chip microcomputer, which includes the following steps:

[0025] Step 1: Determine the total number of dimming levels as N*L, N is the original number of dimming levels, N is a preset natural number, L is the number of levels interpolated for each dimming level in the original dimming level, and L is Preset natural number, total dimming time T C , the value of the single-chip PWM wave generation register is M, M is a fixed value, set the dimming index level n, and assign n to 0;

[0026] Step 2: Calculate the time T of the PWM wave at each dimming level C / (N*L);

[0027] Step 3: Set the dimming interpolation level l, and assign l to 0;

[0028...

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Abstract

The invention relates to a PWM dimming method for LEDs, which is used to adjust the PWM wave output by a single-chip microcomputer. C , the single-chip PWM wave generation register value is M, M is a fixed value, and n is assigned a value of 0; Step 2: Calculate the time T of the PWM wave at each dimming level C / (N*L); Step 3: l is assigned a value of 0; Step 4: l=l+1; the duty cycle of the PWM wave actually output by the microcontroller is set to represent that the real number x is rounded up; Step 5: judge l Whether it is greater than or equal to L, if it goes to step 6, if not, it goes to step 4; step 6: n=n+1; step 7: judge whether n is greater than or equal to N, if it is the end of the program, if not, it goes to step 3. The method provided by the invention greatly increases the dimming level, makes the dimming more soft, can greatly reduce the non-linear feeling of people when adjusting the LED, and makes the dimming more uniform.

Description

technical field [0001] The invention relates to a PWM dimming method of an LED. Background technique [0002] With the development of LED lighting technology, its advantages over traditional lighting are prominent, and LED lights are gradually replacing traditional lighting in society. It has the following advantages: the manufacturing materials are environmentally friendly; the particle layout of the LED lamps causes less scattering and greatly reduces light pollution; it directly converts electrical energy into light and has high energy efficiency; the manufacturing materials are stable and not easily damaged. [0003] The optical parameters of LED lights mainly include: light intensity, luminous flux, illuminance, luminous efficiency, etc., and the electrical parameters of LED lights mainly include: current, voltage, power, power factor, etc. Generally speaking, because a small change in the forward voltage drop of the LED can cause a large change in the forward current ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/10Y02B20/30
Inventor 杜杉杉茅忠群诸永定方献良
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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