System Design of Digitally Controlled Constant Current Source

Ai Jun Zhu; Yin Chao Shao

doi:10.4028/www.scientific.net/AMM.313-314.387

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 313-314System Design of Digitally Controlled Constant...

System Design of Digitally Controlled Constant Current Source

Abstract:

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.

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Periodical:

Applied Mechanics and Materials (Volumes 313-314)

Pages:

387-390

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.313-314.387

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Online since:

March 2013

Authors:

Ai Jun Zhu, Yin Chao Shao

Keywords:

Constant Current Source, Digital Control, Step

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