LIGHTNING PROTECTION OF THE AIR VALVE OF THE AIRCRAFT

Abstract

Background. Topicality of the topic an important device of the aircraft air conditioning system is the automatic pressure control system for the pressurized cabin, which includes a number of devices, but one of the main ones is the exhaust valve. The electromechanism of the aircraft pneumatic valve includes two brushless electric motors that control the damper, with rotor position sensors based on a magnetically controlled Hall effect microcircuit. inside the electronic control and monitoring unit of the pneumatic valve as close as possible to the object of protection, i.e. the Hall sensor. The pneumatic valve must pass the test for susceptibility to transients caused by lightning, according to the qualification requirements KT-160D in category A3, which means the third level contact test. A protection element was chosen in the form of a TVS diode (voltage limiter), which is installed in the power circuits and on the logic signal lines from the Hall sensors. Materials and methods. An electrical circuit of lightning protection against transients on the domestic element base has been developed, its practical implementation in the form of a printed circuit assembly for installation in the pneumatic valve electromechanism has been presented. The operation of the lightning protection circuit against transients was simulated in the Multisim software package, for which SPICE models of domestic elements and a microsecond pulse generator circuit were developed. Results and conclusions. The simulation results of the pneumatic valve lightning protection confirmed the operability of the proposed solution.

Keywords

• aircraft
• air outlet valve
• hall sensor
• transients
• qualification requirements
• lightning protection
• tvs diode
• electrical circuit
• printing unit
• simulation