LED lamp brightness change control method suitable for singlechip processing and device thereof

A technology of LED lights and brightness changes, applied in lighting devices, lamp circuit layout, light sources, etc., can solve the problems of occupying more program storage space, consuming a lot of CPU time, occupation, etc., achieving a comfortable brightness feeling and saving manufacturing costs. Effect
CN102883504AActive Publication Date: 2013-01-16KEBODA TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
KEBODA TECH CO LTD
Publication Date
2013-01-16

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Abstract

The invention discloses an LED (Light Emitting Diode) lamp brightness change control method suitable for singlechip processing, which comprises the following steps: judging whether an expected duty cycle discrete value EP is equal to a current duty cycle discrete value CP or not, if not equal, calculating the duty cycle change prediction interval time ITC, wherein ITC is equal to FP / CP, and the FP is a discretization value of the 100 percent duty cycle; comparing the ITC with a preset allowable interval time ITM, if the ITC is larger than the ITM, allowing the change interval time IT of the duty cycle with the duty cycle discretization value plus or minus 1 to be equal to ITM; if the ITC is less than or equal to ITM, allowing the IT to be equal to ITC; judging whether the IT is reached or not, if yes, comparing the EP and the CP; if the EP is larger than the CP, adding 1 to the CP; if the EP is less than the CP, subtracting 1from the CP; and repeating steps 1-9 till the CP is equal to the EP. The invention also discloses a device for the realization of the method. According to the invention, less singlechip resource is consumed, and smoother brightness change is obtained.
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Description

technical field

[0001] The invention relates to a method and a device for controlling the brightness change of an LED lamp suitable for processing by a single-chip microcomputer. Background technique

[0002] People's subjective brightness perception has a logarithmic relationship with physical brightness. In order to obtain a more comfortable brightness change, the brightness of LED lights is generally controlled to change exponentially with time. The brightness adjustment of LED lights is generally realized by adjusting the duty ratio of the signal. When the duty ratio changes exponentially with time, people feel more comfortable about the change of LED brightness.

[0003] In order to realize the control of the exponential curve, the following methods are generally used at present: 1. Directly carry out Taylor series expansion on the exponential curve;

[0004] The first method to perform Taylor series expansion can control the smooth brightness feeling, but it requires ...

Claims

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