Abstract
In-Circuit Test System is an instrument that uses the VI curve test to diagnose circuit faults. Generally, continuous signals such as sine wave, triangle wave and square wave are used as the VI curve test excitation source. There are some problems in the synchronization of the analysis. In this paper, we study a VI curve test based on discrete excitation signal, analyze the problems arising from continuous signal testing, and propose a continuous signal discretization circuit scheme. The feasibility and practicability of this method are proved by Matlab simulation and experiment.
Highlights
VI curve test is a kind of circuit fault diagnosis technology for power failure test
Under the control signal (CTR), the continuous signal is discretized by the excitation-voltage-injection circuit, where Ui determines the amplitude of the excitation signal
In order to simplify the final calculation of the circuit output response, a Laplace transform is performed on the discrete signal fs(t) to convert the time domain to the frequency domain:
Summary
VI curve test is a kind of circuit fault diagnosis technology for power failure test. Because of the impedance test, there is no large current on the testing board, so the test is safer[4] It has strong versatility, and has become one of the hot issues in the field of circuit fault diagnosis[5]. Replace the continuous signal with a series of discrete pulse signals whose amplitude and pulse width can be adjusted. It realizes the synchronization of excitation and response, and improves the test security, which can well solve the original problems in the VI curve test
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