Portable wide-limit high-stability constant current source

Abstract

The invention relates to a portable high-stability constant-current source with a wide range, and its structure includes an ARM single-chip microcomputer system, a touch screen module, a boost module, a negative feedback amplification module, a DA control module, a constant-current source adjustment module, a current compensation module, Temperature measurement and holding module, sampling resistance module, detection module, constant current source power supply module and power module and other parts. The invention can output a high-precision voltage reference with any voltage value between 0-10V, and the relative standard deviation of the output voltage reaches 2.34*10 in a short time ‑7 , the voltage stability is 3.4*10 ‑8 . The constant current source of the present invention solves the problem that the stepping transformer in the traditional constant current source adjusting tube voltage drop control circuit needs to be specially made and the current mutation before and after switching due to uneven voltage stepping, the motor control circuit and the mechanical deceleration device of the voltage regulator are complicated and huge. After the introduction of the switching power supply, the interference caused by the current stability and ripple is large and other defects and deficiencies.

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

Images