Low-voltage test circuit and method for initiating explosive device

Abstract

The invention discloses a low-voltage test circuit and a low-voltage test method for an initiating explosive device. The method comprises the following steps of: (1) disconnecting a high-voltage control loop of the initiating explosive device, and applying test excitation voltage to the low-voltage test circuit; (2) converting low-voltage differential signals on a resistor R1 and a resistor R2 of a double-bridge wire initiating explosive device into a single-ended output signal by using an instrument amplifier, amplifying, outputting to a filter, filtering the signal by using the filter, and outputting comparison voltage Ub; (3) amplifying low-voltage differential signals on a detection resistor R5, a detection resistor R6 and a detection resistor R7, converting and filtering to generate three reference comparison voltages, namely U0.3, U0.8 and U2.0; (4) comparing the Ub with the U0.3, the U0.8 and the U2.0 by using three comparators respectively; and (5) determining the current state of the initiating explosive device through a comparison result. The low-voltage test circuit is simple and reliable, a small number of elements are used, a test loop is not required to be charged with accurate current, the circuit does not have parameters required to be adjusted, and the judgment method is simple.

Description

technical field [0001] The invention relates to a design method and a circuit for performing low-voltage testing on a path of pyrotechnics by using a precision resistor, and belongs to the field of built-in testing (BIT) of bombing equipment of a weapon system. Background technique [0002] In the process of testing missiles and launch vehicles, the testing of pyrotechnics is a key test item. The pyrotechnics test is divided into two parts: low-voltage test and high-voltage test. In tactical weapons, only high-voltage tests are generally carried out, that is, the control loop test of pyrotechnics. In strategic weapons or launch vehicles, both high and low-voltage tests of pyrotechnics are required. conduct. The low-voltage test can test the on-off and resistance changes of the pyrotechnic product. The open circuit of the pyrotechnic product will cause the pyrotechnic product to fail to detonate normally; If the effective working current is not reached, it will also cause t...

AI Technical Summary

Problems solved by technology

[0003] At present, the low-voltage test method of pyrotechnic products generally adopts the method of current source. This test method can test the open circuit fault of pyrotechnic products, but cannot test the small-scale change of the resistance of the bridge wire, especially in the case of double bridge wires used in parallel. It is more difficult to test the failure of single bridge wire

At the same time, there are many circuit parameters that need to be adjusted on site for each set of products, and the test circuit is relatively cumbersome.

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