Portable wide-limit high-stability constant current source

Abstract

The invention relates to a portable wide-limit high-stability constant current source. The portable wide-limit high-stability constant current source structurally comprises an ARM single-chip microcomputer system, a touch screen module, a boosting module, a negative feedback amplifying module, a DA control module, a constant current source adjusting module, a current compensation module, a temperature measuring and keeping module, a sampling resistor module, a detecting module, a constant current source power supplying module, a power source module and other parts. The portable wide-limit high-stability constant current source can output high-precision voltage reference of any voltage value from 0 V to 10 V, the relative standard deviation of output voltage within a short time can reach 2.34*10<-7>, and the voltage stability is 3.4*10<-8>. The constant current source overcomes the defects that in a traditional constant current source adjusting tube voltage drop control circuit, a grade-distribution transformer needs to be manufactured specially, sudden current change before and after switching is caused by uneven voltage grade distribution, a motor control circuit and a voltage regulator machinery speed reducing device are complex and huge, and after a switching power source is introduced, current stability and ripple waves are disturbed greatly.

Description

technical field [0001] The invention relates to a power supply device, in particular to a portable wide range high stability constant current source. Background technique [0002] With the development of modern technology, scientific research departments and industrial enterprises have put forward higher requirements for the accuracy and stability of constant current sources. For example, a constant current source with an output current of 1mA and a stability higher than 1ppm is required in the scheme of studying the quantum mass benchmark to define the kilogram unit and in the power balance scheme. In addition, in the superconducting magnet system, in order to generate a magnetic field, it is necessary to provide a constant current to the superconducting coil, and the stability is required to be on the order of 10ppm. [0003] The accuracy level of the constant current source used in the existing domestic market is only 10 -4 Order of magnitude, stability is only 10 -5 o...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a portable high-stability constant current source with a wide range to solve the problem of uneven voltage of the traditional constant current source adjustment tube voltage drop control circuit and large current changes before and after switching

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