Aircraft instrument and backup power therefor provided by magneto P-lead

摘要

An aircraft instrument includes an engine display area providing aircraft engine parameters simultaneously with an electrical system display area that selectively provides one of a plurality of aircraft electrical system parameter displays. In the event of an aircraft electrical power supply failure, the instrument may be automatically powered by otherwise unused energy safely harvested from one or all magneto P-leads of an aircraft via an energy harvesting circuit.

主权项

1. An energy harvesting circuit for safely harvesting electrical energy from an aircraft engine ignition magneto having a P-lead, said circuit comprising:
a time-sensitive circuit connecting said P-lead to an AC-to-DC rectifier circuit after a delay from the start of a magneto ignition initiation event to produce a DC output voltage by harvesting unused electrical energy from the ignition magneto P-lead without adversely affecting the ignition initiation event.