Performance evaluation of wideband bio-impedance spectroscopy using constant voltage source and constant current source

2012 ◽  
Vol 23 (10) ◽  
pp. 105703 ◽  
Author(s):  
Youssoufa Mohamadou ◽  
Tong In Oh ◽  
Hun Wi ◽  
Harsh Sohal ◽  
Adnan Farooq ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Impedance Spectroscopy ◽  
Current Source ◽  
Constant Current ◽  
Voltage Source ◽  
Constant Voltage ◽  
Constant Current Source

Design of Digital Control DC Voltage Source Based on AT89C52 MCU

2014 ◽  
Vol 484-485 ◽  
pp. 1126-1129
Author(s):  
Wei Wang
Keyword(s):  
Current Source ◽  
Step Function ◽  
Constant Current ◽  
Voltage Source ◽  
Constant Voltage ◽  
Good Reliability ◽  
Constant Current Source ◽  
Display Module ◽  
Dc Voltage ◽  
The Core

the system to DC voltage source as the core, AT89C52 MCU as the main controller, the output voltage to set the DC power supply through the keyboard, with a step function voltage to reality, the actual output value. This design is divided into four modules: SCM control and display module, digital to analog (D/A) conversion module, a constant voltage source module, output module. MCU control module as the core, the input signal is converted to digital quantity output; constant current source module voltage D/A conversion to analog conversion into constant pressure through a constant voltage circuit. The system has good reliability, high precision.

Advanced LIVA/TIVA Techniques

2001 ◽  
Author(s):  
R. Aaron Falk
Keyword(s):  
Integrated Circuits ◽  
Integrated Circuit ◽  
Current Source ◽  
Fault Isolation ◽  
Constant Current ◽  
Voltage Source ◽  
Constant Voltage ◽  
Constant Current Source ◽  
Current Sensing ◽  
Order Of Magnitude

Abstract LIVA (L ight I nduced V oltage A lterations) and TIVA (T hermally I nduced V oltage A lterations) have demonstrated significant capability for fault isolation. A difficulty with both techniques is their use of a constant current source, whereas integrated circuits operate with a constant voltage source. A new technique that utilizes the constant current sensing of LIVA/TIVA, while allowing for use of constant voltage bias on the integrated circuit, has been developed. As a bonus, the technique is also significantly more sensitive (at least one order of magnitude) than the standard LIVA/TIVA approach.

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.

Study on the Application of High Precision Strain Acquisition System Based on Twin-Constant-Current Source

2013 ◽  
Vol 437 ◽  
pp. 399-403
Author(s):  
Zong Ju Hu ◽  
Zeng Yong Long
Keyword(s):  
Current Source ◽  
Acquisition System ◽  
Constant Current ◽  
Voltage Source ◽  
Constant Current Source ◽  
Strain Collection ◽  
High Measurement ◽  
Fan Blade ◽  
Lab Test ◽  
Deformation Tests

Aiming at the shortcomings of the constant voltage source strain acquisition system, the paper put forward a new strain acquisition technology based on the double-side half-bridge measurement of the constant current source. It has demonstrated and analyzed the advantages of constant current source circuit using for strain collection, and has raised the design of multi-channel strain acquisition system. Lab test and running in a large fan blade deformation tests showed that the strain acquisition system had high measurement precision, stability, anti-interference and reliability.

Design and Simulation of LED Drive Power Supply Based on ARM

2012 ◽  
Vol 588-589 ◽  
pp. 936-939
Author(s):  
Hong Li Cheng ◽  
Xiao Dan Ren ◽  
Shuai Sun
Keyword(s):  
Power Supply ◽  
High Efficiency ◽  
Current Source ◽  
Constant Current ◽  
Voltage Source ◽  
Drive Power ◽  
Small Current ◽  
Constant Current Source ◽  
Pid Algorithm ◽  
In Series

This paper introduces a kind of numerical controlled LED drive power supply based on ARM7. User can set the number and brightness of the LEDs to be lit by the remote control. Switching voltage source and the linear constant current source are connected in series, this circuit structure can ensure high efficiency and small current ripple. ARM7 completes the data collection, fuzzy PID algorithm processing, and real-time output adjustment. This paper explains the working principle of the system in detail and then simulates it in the simulink. The results show that it can satisfy the users' diverse requirements well and give full play to the convenience and controllability of the digital controller.

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

The Method of Conductor Resistance Autocompensation in New Two-Wire Thermistor Temperature Measurement

2013 ◽  
Vol 718-720 ◽  
pp. 450-454
Author(s):  
Ning Yang ◽  
Hai Ting Zhu ◽  
Shao Shan Zhong
Keyword(s):  
Temperature Measurement ◽  
Current Source ◽  
Processing System ◽  
Constant Current ◽  
Large Temperature ◽  
Constant Current Source ◽  
Thermistor Temperature ◽  
Important Position ◽  
Temperature Measurement System ◽  
Data Acquisition And Processing

Thermistor has a large temperature range, good stability and resistance to oxidation, which occupies an important position in the low-temperature measurement. This article describes new two-wire thermistor temperature measurement device using the Freescale MC9S12XS128 MCU with sampling capacitance. The device is composed of the MCU with its own A/D, MC9S12XS128 MCU, sampling capacitance, amplifier, boosted circuit, data acquisition and processing system, constant current source, etc. Using constant current source and 16-bit A/D converter designs the temperature measurement circuit, it can eliminate the effect from the conductor resistances in the traditional two-wire resistance temperature measurement system and reduce the measurement error which conductor resistances bring. The method is simple, practical, with high accuracy, strong anti-interference ability and other characteristics.

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