Program-control current source

Abstract

The invention relates to a current source device, in particular to a program-control current source. The program-control current source comprises a CPU (central processing unit) control circuit, a plurality of conversion modules and a calibrating circuit. The CPU control circuit receives data output by an upper computer, and each conversion module outputs actuating signals including control signals and data signals and comprises a D/A (digital/analog) conversion circuit and a V/I (voltage/current) conversion circuit. The D/A conversion circuits receive actuating signals output by the CPU control circuit and provides analog voltage signals for the V/I conversion circuit. The V/I conversion circuits converts the analog voltages signals and outputs analog current signals. The calibrating unit is used for sampling the analog current signals output by each V/I conversion circuit, and the CPU control circuit calibrates the analog current signals. The current source in the embodiment can provide multichannel outputs and is wide in dynamic output range and high in accuracy.

Description

technical field [0001] The invention relates to a current source device, in particular to a program-controlled current source device. Background technique [0002] Since current signals have stronger anti-interference ability than voltage signals, especially when performing long-distance signal transmission, various current sources are widely used in industrial control. In industrial applications, it is often necessary to convert various physical quantities such as voltage, power, frequency, temperature, pressure, speed, angle, etc. into current quantities for processing or display by back-end circuits or devices. [0003] In the ground hardware-in-the-loop simulation test of the inertial navigation system (hereinafter referred to as the inertial navigation system), it is necessary to dynamically simulate the current output of the quartz flexible accelerometer, and then simulate the acceleration component of the flight trajectory curve, which is used as the flight attitude o...

AI Technical Summary

Problems solved by technology

[0009] However, after investigation, there is currently no current source in the industry that can meet the special requirements of the above inertial navigation system simulation at the same time, mainly in the following aspects: First, the static output accuracy is high, but it cannot change quickly and dynamically, such as the FLUKE5500\5700 series; Second, The number of output channels is single. If multiple outputs are required, they can only be combined with multiple current sources. Third, the accuracy of most current sources with a large output dynamic range is generally relatively low, about ±5%.

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