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Numerical-control direct-current current source

A technology of DC current source and current gear, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., and can solve problems such as complex power supply structures

Active Publication Date: 2013-07-24
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Summary
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AI Technical Summary

Problems solved by technology

In the current equipment that requires tens to hundreds of milliamperes, the voltage provided by D / A is generally used to achieve constant current output through V / I conversion, and then the output is amplified by ordinary triode and Darlington tube, and finally through A / D To feedback the output current value, so as to achieve closed-loop control to make the output current value accurate and stable, but this type of power supply has a complex structure and can only achieve positive current output

Method used

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  • Numerical-control direct-current current source
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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. While illustrations of parameters including particular values ​​may be provided herein, it should be understood that parameters need not be exactly equal to the corresponding values, but rather may approximate the values ​​within acceptable error margins or design constraints.

[0021] The present invention proposes a digitally controlled DC voltage / current source system. The parameters and operations of the power supply are all set in the control interface on the PC, and the control chip of the power supply controls other parts of the circuit to work together according to the settings to obtain a system that meets the requirements. power supply. It should be noted that the present invention takes a PC and a programmable lo...

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Abstract

The invention discloses a numerical-control direct-current current source. Voltage is provided by a D / A (digital to analog) conversion module, and is directly outputted by a power operational amplifying module, the outputted current is sampled for feedback control, the outputted current can range from several milliamperes to several amperes, the accuracy can reach 1 per mill, and the bidirectional current output can be realized. In addition, the numerical-control direct-current current source also has an overvoltage protection function and an outputted current and voltage measuring and displaying function.

Description

technical field [0001] The invention relates to the technical field of power supplies in the electronic information industry, in particular to a digitally controlled direct current source that uses digital signal input to control output. Background technique [0002] The voltage and current source is one of the key designs in the development of many instruments and equipment. The error generated when the power supply is working will affect the accuracy of the entire system, and the use of the power supply will cause many adverse consequences. [0003] There are many varieties of ordinary DC regulated power supplies, but they all have the following problems: ①The output voltage or current is adjusted by coarse adjustment (band switch) and fine adjustment (potentiometer). In this way, when the output voltage or current needs to be accurately output, or needs to be changed in a small range (such as 1.01-1.02V or 1.01-1.02mA), the difficulty is greater. In addition, as the use ...

Claims

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Application Information

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IPC IPC(8): G05F1/46
Inventor 徐春雨杨海钢胡凯曾宪理王德利
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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