The Power Processing Unit (PPU) is designed as a part of the Electric Propulsion System (EPS) SPS-25, which consists of ST-25 Hall Thruster and Xenon Feed System (XFS). PPU consists of 3 main subsystems: Thruster and XFS power parts and the main controller. Also, XFS has external microcontroller based measurement unit.
The Thruster power part controls the converters which transform the onboard power to anode and cathodes using power stabilization.
The XFS power part is intended to control low-voltage power supplies, heaters, valves and communicate with XFS measurement unit. The XFS measurement unit part is connected to PPU via RS-485 interface. It is intended to control low-voltage power supplies and measurement circuits for XFS sensors. The main controller performs operating algorithms, controls all power converters, measurements, and provides communication with the onboard computer.
The SPS-40 Propulsion System was designed for medium and large satellites and able to adjust the orbit parameters and insure the maneuverability of satellites in space.
The SPS-25 Propulsion System was designed for mini satellites mass up to 500 kg.
The ST-100 Hall Thruster with an anode layer is designed for use as part of the propulsion system for satellites mass up to 1 T.
The ST-40 Hall Thruster with an anode layer is designed for use as part of the propulsion system for satellites mass up to 1 T.
The ST-25 Hall Thruster is a modification of a Thruster with an Anode Layer.
The Power Processing Unit is one of the components of the SPS-40 and SPS-25 propulsion systems.
SETS is developing a modular Xenon Feed System (XFS) with significant reductions in mass and cost while increasing system reliability.
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