Adjustable Multi-Light Wireless Remote Control System Designed LED Light

2014 ◽  
Vol 543-547 ◽  
pp. 1250-1253
Author(s):  
Hong He ◽  
Feng Ling Zhang ◽  
Zhi Hong Zhang
Keyword(s):  
Remote Control ◽  
Smart Home ◽  
Current Source ◽  
Constant Current ◽  
Led Driver ◽  
Constant Current Source ◽  
Current Output ◽  
The People ◽  
Indoor Wireless ◽  
Lighting Systems

With the development of LED technology, the actual demand of the people for the smart home lighting, this paper designed a multiple lamps for indoor wireless remote control dimmable LED lighting systems. LED driver is using two levels of drive structure, and driver power supply adopts double-road current output, and the size of the output current of each constant current source is flexible to adjust by remote control. Wireless remote control part control multiple lamps by using 4 * 4 keyboard, which realizes intelligent management of LED interior lighting in the smart home.

System Design of Digitally Controlled Constant Current Source

2013 ◽  
Vol 313-314 ◽  
pp. 387-390
Author(s):  
Ai Jun Zhu ◽  
Yin Chao Shao
Keyword(s):  
Current Source ◽  
Constant Current ◽  
Constant Current Source ◽  
Digital To Analog Converter ◽  
Current Output ◽  
Error Ratio ◽  
Digitally Controlled ◽  
Output Module ◽  
System Output ◽  
Time Acquisition

In order to provide stable and adjustable current source for portable systems, this paper designs a digitally controlled constant current source. According to the input of independent key, the output of the microcontroller digital volume controls digital-to-analog converter by Voltage-Current conversion module to get the constant current output. The output module consists of the operational amplifier and the power transistor TIP122, which is used for voltage-current conversion. At the same time, the value of output current is obtained by sampling resistor to convert the real-time acquisition and monitor the output of constant current source. The experimental results show that the system output ranges from 0 mA to 240 mA. The value of constant current can be controlled by stepper key, and the measurement error ratio can meet the requirement of design.

Design of Constant Current Source Based on Pulse Width Modulation

2013 ◽  
Vol 645 ◽  
pp. 418-421
Author(s):  
Li Hui Sun ◽  
Shu Jing Wang ◽  
Wei Chen
Keyword(s):  
High Precision ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Current Source ◽  
Constant Current ◽  
Output Current ◽  
Constant Current Source ◽  
Current Output ◽  
High Conversion Efficiency ◽  
Working Principle

Design of the constant current source based on pulse width modulation, and its working principle are discussed. The design can adjust the output current through pulse width modulation (PWM), and realize micro regulation by feedback output which stabilizes current output. The constant current source has some advantages of high precision, stable work, high conversion efficiency.

Design of Low Power Lighting LED Driver with Multiplex Divided Constant Current Source

2013 ◽  
Vol 380-384 ◽  
pp. 3204-3208
Author(s):  
Fei Yu ◽  
Zhao Jie
Keyword(s):  
Low Power ◽  
Heat Dissipation ◽  
Low Cost ◽  
Current Source ◽  
Constant Current ◽  
Voltage Source ◽  
Led Driver ◽  
Constant Current Source ◽  
Good Efficiency ◽  
Driver Circuit

Low power lighting LED has the advantages of low cost and good heat dissipation. But the current driver for this kind of LED does not have a good efficiency. In this paper a new kind of LED driver circuit was designed. By using current mirror and PWM technique, the circuit has good efficiency. By simulation with PSPICE, we can prove that the circuit has can divide current equally and has a good performance while the voltage source has some jitters.

scholarly journals Illumination Adaptation in a Multi-Wavelength Opto-Electronic Patch Sensor

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4734 ◽  
Author(s):  
Liangwen Yan ◽  
Yue Yu ◽  
Sijung Hu ◽  
David Mulvaney ◽  
Panagiotis Blanos ◽  
...  
Keyword(s):  
Rapid Determination ◽  
Current Source ◽  
Constant Current ◽  
Blood Oxygen Saturation ◽  
Led Driver ◽  
Constant Current Source ◽  
Light Emitting ◽  
Multi Wavelength ◽  
The Individual ◽  
Microcontroller Unit

In capturing high-quality photoplethysmographic signals, it is crucial to ensure that appropriate illumination intensities are used. The purpose of the study was to deliver controlled illumination intensities for a multi-wavelength opto-electronic patch sensor that has four separate arrays each consisting of four light-emitting diodes (LEDs), the wavelength of the light generated by each array being different. The study achieved the following: (1) a linear constant current source LED driver incorporating series negative feedback using an integrated operational amplifier circuit; (2) the fitting of a linear regression equation to provide rapid determination of the LEDs driver voltage; and (3) an algorithm for the automatic adjustment of the output voltage to ensure suitable LED illumination. The data from a single centrally-located photo detector, which is capable of capturing all four channels of back-light in a time-multiplexed manner, were used to monitor heart rate and blood oxygen saturation. This paper provides circuitry for driving the LEDs and describes an adaptive algorithm implemented on a microcontroller unit that monitors the quality of the photo detector signals received in order to control each of the individual currents being supplied to the LED arrays. The study demonstrated that the operation of the new circuitry in its ability to adapt LED illumination to the strength of the signal received and the performance of the adaptive system was compared with that of a non-adaptive approach.

scholarly journals Low noise constant current source for bias dependent noise measurements

2011 ◽  
Vol 82 (1) ◽  
pp. 013906 ◽  
Author(s):  
D. Talukdar ◽  
R. K. Chakraborty ◽  
Suvendu Bose ◽  
K. K. Bardhan
Keyword(s):  
Current Source ◽  
Low Noise ◽  
Constant Current ◽  
Constant Current Source ◽  
Noise Measurements
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