The High Power PCDU has been originally developed for the X-band Synthetic Aperture Radar Satellite, Terrasar-X. Based on a modular concept that has been already applied by Airbus Defence and Space on several former programs, it is designed to be easily scaled and adapted to di erent Solar Array power ranges and distribution con gurations with a minimum non recurring cost.
For applications in LEO orbit the Power Control and Distribution Unit (PCDU) controls the power flow from the solar generator to the battery and distributes power, on command from the onboard computer, to the instruments, the heaters and the propulsion system. It applies the Maximum Power Point Tracker (MPPT) technology to control the Solar Array power in order to protect the battery against overcharge. MPPT technology allows to provide, in any condition and whenever it is needed, the maximum power capability of the Solar Array generator. Radar peak power capability is taken directly from the battery to avoid over-sizing the primary power source and the conditioning electronics.
The PCDU is a fully autonomous unit able to work in any sun, eclipse and transition mode without the operation of any other external unit. The PCDU provides a dual bus power system able to distribute up to 5KW of electrical power through unregulated 50V bus and up to 1500W through regulated 28V to bus and instrument units.