A DC constant resistance electronic load device

Abstract

The invention relates to a direct-current electronic load and especially relates to a direct-current constant-resistance electronic load apparatus. By using the apparatus, operation is simple; manual adjustment is not needed; and accuracy and precision are high. The apparatus is characterized in that the apparatus is formed by a voltage acquisition circuit, a signal conditioning circuit, a voltage maintenance circuit, a load driving circuit and a simulation load circuit; the voltage acquisition circuit collects a detected power supply output voltage; a voltage signal acquired through sampling is processed by the signal conditioning circuit so as to adapt to a load driving circuit signal requirement; the conditioning circuit outputs to the voltage maintenance circuit so as to carry out voltage maintenance; the voltage maintenance circuit outputs to the load driving circuit; and the driving circuit outputs to a control terminal of the simulation load circuit. Compared to the prior art, by using the apparatus of the invention, the electronic load can realize a constant-resistance mode; and the circuit possesses characteristics that the structure is simple, real-time following performance is realized, linearity is good and so on.

Description

Technical field: [0001] The invention relates to a DC electronic load, in particular to a DC constant resistance electronic load device with high accuracy and precision, which is simple to operate and does not require manual adjustment. Background technique: [0002] The constant resistance mode of the existing electronic load is generally realized by single-chip microcomputer control. First convert the voltage signal into a digital signal with an A / D converter, then use a single-chip microcomputer to collect the digital signal, then let the single-chip microcomputer calculate and output a value according to Ohm's law, and finally convert the calculated value into an analog quantity through the D / A converter To control the load power tube to output the corresponding current signal. Since the process uses a single-chip microcomputer, the entire sampling calculation process takes a certain amount of time, so this electronic load has poor followability, poor anti-interference ...

AI Technical Summary

Problems solved by technology

This method has better followability compared with single-chip control. However, the signal output by the comparator circuit is a pulse signal, which causes the current flowing through the analog load to be a pulse signal, so the current will fluctuate around a certain value, so the performance The equivalent resistance value is also unstable

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