A pyrotechnic product measurement and short-circuit protection circuit

Abstract

The invention discloses a pyrotechnic device measurement and short-circuit protection circuit, which includes a constant current source drive circuit, a measurement amplifier circuit and a pyrotechnic device; the positive and negative poles of the constant current source drive circuit are connected in series with the pyrotechnic device at least two protection resistors and the sum of the resistance values ​​of each protection resistor is greater than the ratio of the maximum failure voltage of the constant current source drive circuit to the preset value of the safety current; at least two protection resistors are connected in series between the positive and negative poles of the measuring amplifier circuit and the pyrotechnics And the sum of the resistance values ​​of each protection resistor is greater than the ratio of the maximum failure voltage of the measurement amplifier circuit to the preset value of the safe current; a double-throw switch is set between the constant current source drive circuit and the pyrotechnics, and in the measurement state, the double-throw switch will The pyrotechnic product is connected with the constant current source drive circuit; in the non-measurement state, the double-throw switch is controlled to short-circuit the pyrotechnic product circuit; the present invention can limit the abnormal current of the failed pyrotechnic product test circuit within a safe range, and improve the pyrotechnic Product testing for safety.

Description

technical field [0001] The invention belongs to the technical field of measurement and control, and more specifically relates to a measurement and short-circuit protection circuit for pyrotechnics. Background technique [0002] There are bridge method and constant current source method for commonly used pyrotechnics measurement. Among them, the bridge method has the disadvantages of narrow measurement range and low flexibility, so it is used less and less; constant current source measurement is stable because of its wide measurement range. Good performance, strong anti-interference ability, more and more widely used in mainstream product design. [0003] The constant current source measurement generally adopts the four-wire measurement technology, which can effectively reduce the influence of the resistance value of the measurement line itself on the measurement results, but cannot improve the safety of the test. Therefore, in the process of using the constant current source...

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Problems solved by technology

[0002] There are bridge method and constant current source method for commonly used pyrotechnics measurement. Among them, the bridge method has the disadvantages of narrow measurement range and low flexibility, so it is used less and less; constant current source measurement is stable because of its wide measurement range. Good performance, strong anti-interference ability, more and more widely used in mainstream product design

[0003] The constant current source measurement generally adopts the four-wire measurement technology, which can effectively reduce the influence of the resistance value of the measurement line itself on the measurement results, but cannot improve the safety of the test. Therefore, in the process of using the constant current source test, it is necessary to increase the protection circuit Improving safety in pyrotechnics testing

[0004] The current method to improve the safety of constant current source testing is mainly to control the output current of the constant current source and reduce the output current to as small as possible to ensure the safety of the test; but this single method cannot solve the problem of constant current source and measurement. Measurement risks such as abnormal explosion of pyrotechnics caused by terminal device failure

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