|Table of Contents|

Isolated solenoid valve current measurement circuit in rocket engine test(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2020年05期
Page:
102-108
Research Field:
测控与试验
Publishing date:

Info

Title:
Isolated solenoid valve current measurement circuit in rocket engine test
Author(s):
LING Sirui; DING Boshen
(Beijing Institute of Aerospace Testing Technology, Beijing 100074,China)
Keywords:
current measurement;  solenoid valves;  isolation;  inverse voltage suppression;  temperature drift
PACS:
V433,TM933.1
DOI:
-
Abstract:
In the ground test of rocket engine, a large number of solenoid valves in the engine and test process system were needed to be controlled and record state.The solenoid current measurement system was required to have high static accuracy and dynamic performance.Aiming at the problems in traditional application, an integrated current measurement circuit was realized.The DC-DC modules and TPS717 were used for isolated power supply.Voltage on the 10 mΩ shunt resistor was amplified by an INA240 and was isolated by an AMC1311.An INA826 was used for gain adjustment and output.In error analysis, test and calibration prove that the total uncorrectable error of the circuit is 0.144 9%.The calibrated accuracy is better than 0.025%.The -3 dB bandwidth of full output range is 110 kHz.This circuit can be widely used in the driving of various applications of current measurement such as in rocket engine tests.

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Last Update: 2020-10-20