Patent ID: 9484749
Filing Date: 2016-11-01
CPC Classification: B64D,B64F,H02J,Y02T

Claim Text:
1. An electric power supply system for an aircraft having a transformer-less HVDC architecture, the system comprising: at least one multiphase engine generator in a star configuration which provides a multiphase alternating (AC) voltage; a converting circuit for converting the multiphase AC voltage into a corresponding direct (DC) voltage for supplying at least one aircraft electrical load; an electric power supply interface for connection with a standardized ground power unit (GPU) plug of an external GPU, the electric power supply interface comprising a supply voltage output terminal coupled to a self-contained power source for providing a low voltage control signal for driving a GPU internal switching circuit, wherein the power source is decoupled from the AC voltage and DC voltage, and a neutral conductor input terminal which corresponds to a neutral conductor output terminal of the GPU; and a monitoring circuit connected between the neutral conductor input terminal and the aircraft body for monitoring whether a neutral conductor of the GPU plug is isolated from a body of the aircraft.