Satellite bus electrical power systems (EPS)

Introduction

The Satellite Bus Electrical Power System (EPS) is the "energy hub" of a satellite platform, providing continuous and stable power to payloads (such as communication and remote sensing instruments) and platform subsystems (attitude control, thermal regulation, etc.). Its reliability directly determines the success of satellite in-orbit missions.

Core Components

Energy Collection – Solar cell arrays as the primary source, supplemented by rechargeable batteries for emergency or shadow operation.
Energy Storage – High-performance lithium-ion batteries storing surplus energy, ensuring supply when the satellite enters Earth’s shadow.
Energy Management – Power Control Unit (PCU) enabling distribution, charge/discharge control, overvoltage/overcurrent protection, and system stability.
Energy Distribution – A precise distribution network delivering tailored voltage and power to each satellite subsystem.

Key Requirements

High Reliability – as maintenance in orbit is impossible, all components must operate flawlessly.
Lightweight – reducing launch cost by minimizing mass while maintaining performance.
Radiation Resistance – ensuring immunity to cosmic radiation and extreme space temperature fluctuations.
Long Lifespan – matching satellite mission cycles, typically 5–15 years.

Role of SiC & IGBT Devices

To meet the harsh requirements of space applications, SiC MOSFETs, IGBT modules, power modules, and diode modules play a crucial role in satellite EPS:

SiC MOSFETs – high switching efficiency and radiation resistance for energy management circuits.
IGBT Modules – robust high-power handling for satellite power distribution and conversion systems.
Power Modules – integrated solutions balancing efficiency, compactness, and reliability under extreme environments.
Diode Modules – ensuring low-loss rectification and reliable current flow in solar array and battery interfaces.

Why Baoquan Zhijie

Baoquan Zhijie provides space-grade power semiconductor solutions, leveraging advanced SiC MOSFETs, IGBT modules, and diode technologies. Our components are engineered for radiation tolerance, lightweight integration, and long mission lifetimes, ensuring satellites achieve reliable EPS operation throughout their orbital journey.