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A light source dimming method based on ofdm signal

A LED light source and signal technology, applied in the field of light source dimming based on OFDM signals, can solve problems such as reduced power utilization, increased system bit error rate, and impact on system performance, so as to improve use efficiency, ensure accuracy, and improve adjustment. light effect effect

Inactive Publication Date: 2015-12-02
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] Dimming can achieve the purpose of energy saving, but for signal transmission in the dimming system, since the PWM dimming method does not carry signal information, the initial bit stream is sent slowly. In order to solve this problem, ensure that the system transmission performance is not change, it is necessary to increase the bit rate of the sending end, and the increase of the bit rate of the sending end will cause the increase of the system bit error rate and the decrease of the power utilization rate, thus affecting the performance of the system

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  • A light source dimming method based on ofdm signal
  • A light source dimming method based on ofdm signal

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Embodiment Construction

[0030] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] Such as figure 1 As shown, in the actual application process of a light source dimming method based on OFDM signal designed by the present invention, the light source is dimmed for the LED light source, and the dimming method specifically includes the following steps:

[0032] Step 001. Randomly generate a binary bit stream, and divide each frame signal in the binary bit stream into a first signal and a second signal respectively according to the duty cycle of each frame signal in the binary bit stream to form a first signal stream and a second signal. The second signal flow specifically includes the following steps:

[0033] Step 00101. Randomly generate a binary bit stream, and for one frame signal in the binary bit stream, divide the frame signal into a first signal and a second signal according to the duty cy...

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Abstract

The invention relates to a light source dimming method based on an OFDM signal. Interference control is conducted on the 'on' stage and the 'off ' stage of a light source in the strobe process of the LED light source through multi-pulse position modulation signals, so that dimming of the LED light source is achieved, the effect and the accuracy of dimming for the LED light source are effectively improved, the traditional method that a PWM signal is used for dimming is replaced, as a result, the problems that the dimming bit error ratio is high and the power utilization ratio is low are solved, and the dimming performance is improved.

Description

technical field [0001] The invention relates to a light source dimming method based on OFDM signals. Background technique [0002] In order to achieve the purpose of energy saving, people use LED light sources instead of incandescent lamps. LED light sources are more than 5 times more energy efficient than incandescent lamps. If dimming can be used to save energy, then this is also a very important means of energy saving. PWM (pulse width modulation) is One of the most commonly used dimming methods at present. PWM is a very effective technique for controlling analog circuits using the digital output of a microprocessor, and is widely used in many fields. Using the PWM control signal, the brightness of the LED light source can be adjusted by controlling the duty ratio of the forward working current of the LED light source without changing the voltage passing through the LED light source. The more complex the LED light source, the more PWM dimming is required. If the period...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02H04L27/26
CPCY02B20/42Y02B20/40
Inventor 陈健王婷婷由骁迪闫潇
Owner NANJING UNIV OF POSTS & TELECOMM
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