Loop resistance testing device and method based on AD chip
Through the loop resistance testing device based on AD chip, a four-wire measurement circuit and a constant current source circuit are adopted to solve the problem of easy missed or misjudged detection of pyrotech bridge wire break fault detection, achieving higher detection accuracy and reliability.
CN119738613AActive Publication Date: 2025-04-01BEIJING PULIMEN ELECTRONIC TECH CO LTD
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Patent Information
- Application Number
- CN202411780907.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2044-12-05
AI Technical Summary
Technical Problem
Before the rocket is launched, the traditional pyrotechnical bridge wire resistance detection method is prone to misjudgment or misjudgment of circuit failures due to small changes in the overall path resistance value.
Method used
The circuit resistance testing device based on AD chip is adopted, and the four-wire measurement circuit, constant current source circuit circuit and switch control circuit are used to accurately measure the pyrotechnic circuit resistance to prevent the output from being accidentally exploded.
Benefits of technology
It improves the accuracy and reliability of resistance detection of pyrotechnics circuits, prevents misjudgment or misjudgment, and enhances product detection capabilities and working reliability.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention relates to a loop resistance testing device and method based on an AD chip, belongs to the technical field of testing, and solves the problems that when an open circuit fault occurs in one bridge wire, the overall path resistance value change is small, namely the voltage change is small, and missed judgment or misjudgment is likely to happen. The device comprises a power supply circuit, the output end of which is connected with an AD acquisition circuit and a constant current source circuit and supplies power; the switch MOSFET is connected between the control power supply circuit and the constant current source circuit; the AD acquisition circuit is used for acquiring a loop voltage value and a loop current value in a four-wire system measurement circuit mode and providing the loop voltage value and the loop current value to the switch control circuit and the resistor to be measured; the constant current source circuit is connected with the switch control circuit, and is used for generating a measuring current which is not greater than 10mA and providing the measuring current to the switch control circuit; the switch control circuit is connected with the AD acquisition circuit, and controls different relay switches to determine the loop resistance of the security mechanism or the initiating explosive device. The circuit resistance value is measured, and the error ignition output during the circuit resistance value test of the initiating explosive device can be effectively prevented.
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