De-jittering control method for LED light source and circuit thereof

A technology of LED light source and control circuit, applied in the direction of light source, electric light source, electric light circuit layout, etc., can solve the problems of unstable current value, fluctuation of current value, affecting the comfort of LED light source, etc., to reduce flicker and jitter, reduce The effect of up and down

Active Publication Date: 2012-06-06
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, if a single-chip microcomputer chip with a low working clock frequency is used to realize the constant current function of the constant current source, the current value will not be stable at the set value, resulting in fluctuations in the current value, which are reflected in the use effect In the above, when the LED light source is working, the light of the LED light source shakes, which greatly affects the comfort of the LED light source

Method used

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  • De-jittering control method for LED light source and circuit thereof
  • De-jittering control method for LED light source and circuit thereof
  • De-jittering control method for LED light source and circuit thereof

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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0025] We know that since the actual sampled voltage waveform is non-linear at the microscopic level, that is to say, the sampled value is suddenly large and small, so the current value will be unstable. When the operating clock frequency of the single chip microcomputer is low, if you compare each sampling value and adjust the duty cycle of the PWM, the current value will fluctuate up and down from the set value, which is reflected in the LED circuit, which is the brightness of the brightness. Tiny flickering, jittering. In order to solve this problem, the LED light source debounce control method...

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Abstract

The invention relates to a de-jittering control method for an LED light source. The method comprises the following steps that: S1, multi-time sampling is carried out on output voltage values of an LED light source according to a predetermined sampling time interval so as to obtain a plurality of sampling values; variation value removing and averaging processing is carried out on the plurality of sampling values so as to obtain an average sampling value; S2, the average sampling value and a set value are compared to obtain a comparison result; and S3, a duty ratio of a PWM circuit is determined according to the comparison result, wherein the PWM circuit is used for adjusting currents of the LED light source. In addition, the invention also relates to a de-jittering control circuit for an LED light source. According to the de-jittering control method for an LED light source and a circuit thereof in the invention, variation value removing and averaging processing is carried out on multi-time sampling values, so that frequency for adjusting currents of an LED light source is reduced; therefore, up-and-down fluctuation of current values around a set value can be reduced on the basis that constant current drive of the LED light source is not influenced, so that tiny flashing and slight jittering of light intensity of the LED light source can be reduced.

Description

technical field [0001] The invention relates to the field of circuit control, more specifically, to a method and circuit for debounce control of an LED light source. Background technique [0002] At present, if a single-chip microcomputer chip with a low working clock frequency is used to realize the constant current function of the constant current source, the current value will not be stable at the set value, resulting in fluctuations in the current value, which are reflected in the use effect Above all, when the LED light source is working, the light of the LED light source shakes, which greatly affects the comfort of the LED light source. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method that can effectively prevent LED from A light source jittering LED light source debounce control method and circuit. [0004] The technical solution adopted by the present invention to solve the technical problem is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 周明杰屈煜
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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