Capacitor test circuit

Abstract

The invention discloses a capacitor test circuit. The circuit comprises a constant-current source circuit, a voltage comparison circuit and a sampling timing circuit; the constant-current source circuit is used for generating constant charging current to charge a capacitor to be tested; the voltage comparison circuit is used for acquiring the output voltage of the capacitor to be tested, and outputting control signals when the output voltage is greater than a preset first voltage and smaller than a preset second voltage, wherein the control signals are used for triggering the sampling timing circuit to generate sampling signals; and the sampling timing circuit is used for recording the lasting time of the sampling signals, and calculating the capacitance value of the capacitor to be testedaccording to the charging current, the difference value of the second voltage and the first voltage, and a timing result. According to the capacitor test circuit of the present invention, the first voltage, replacing a zero voltage, is adopted as the initial value of the start of timing, and therefore, test errors caused by a condition that a voltage zero position is susceptible to interference can be eliminated, and the accuracy of test results can be improved.

Description

Technical field

[0001] The invention belongs to the technical field of capacitance testing, and more specifically, relates to a capacitance testing circuit for fuze explosive devices. Background technique

[0002] In the field of fuze safety system technology, the most common initiation circuit is capacitor discharge initiation. This initiation circuit is usually combined with communication circuits, control circuits, safety control circuits and other circuits to form the safety system of the fuze. The most critical component in the capacitor discharge initiation circuit It is a capacitor, whose capacitance and correctness of installation are directly related to the success of the fuze detonation, so it is necessary to test the capacity of the capacitor in the detonating circuit;

[0003] The traditional pyrotechnics capacitor test adopts the constant current source test method, which has the following defects: First, the capacitor still has some residual voltage after the power is...

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