iEPS Electrical Power System

iEPS Electrical Power System

Price on request

▪ Compact single PC/104 form factor board solution
▪ FRAM based MCUs for improved radiation tolerance
▪ Hardware voltage, over-current protection and hardware-based maximum power point tracking
▪ Designed for low (idle) power consumption
▪ Solar Panel interface utilizes GaN-FETs
▪ Allows customizations through mountable daughter-board

  • Description
  • Features
  • Product properties
  • Configuration and options
  • Performance
  • Documents

Description

The ISIS Electrical Power System (iEPS) is the second-generation compact power system for nanosatellites, ideal for 1U up to 3U CubeSats. The system leverages wide bandgap semiconductor technologies, implementing GaN-FETs to improve solar power conversion efficiency and performance. It is equipped with an integrated heater, hardware-based Maximum Power Point Tracking (MPPT) and hardware voltage and over-current protection. The iEPS provides 3.3V and 5 V regulated buses, as well as an unregulated bus. An add-on daughter board allows additional configurations to suitably power the system and payload instruments.

  • Compact solution – one PC104 form factor board, ideal for 1U-3U sized platforms
  • Communication over I2C, UART for testing
  • FRAM-based MCUs for improved radiation tolerance
  • Low (idle) power consumption, dedicated emergency low power mode for EPS survivability
  • Hardware voltage, over-current protection and hardware-based maximum power point tracking
  • Hardware Supervisor including Watchdog
  • Solar Panel interface utilizes GaN-FETs
  • Allows customizations through the mountable daughterboard
Mass Type A 184 ± 5 grams (2 cell battery pack)
Type B 310 ± 5 grams (4 cell battery pack)
Type C 360 ± 5 grams (4 cell battery pack + daughterboard)
Volume Type A 96 x 92 x 26.45 mm (PCB and top battery)
Type B 96 x 92 x 11.34 mm (PCB B only)
Type C 96 x 92 x 15.95 mm (PCB C only)
Type B/C 94.4 x 89.3 x 21 mm (4-Cell Battery Pack)
Operating temperature range -20°C to +60°C
Power delivered 20W @ 5V over 4 channels
Energy storage 6300mAh/22.5Wh (Type A)
12800mAh/22.5Wh (Type B/C)

Type A: iEPS board with integrated 2 Li-ion cell battery pack
Type B: iEPS board with modular 4 Li-ion cell battery pack
Type C: iEPS board with modular 4 Li-ion cell battery pack and daughterboard

Allows customization through mountable daughterboard, provides the following voltage domains:
• VD10: Unregulated voltage with one output channel
• VD11: Custom voltage lower than VD10, one output channel
• VD12: Set to 5V with 4 output channels. Voltage can be customized to any voltage lower than VD0.
Daughter board enables ISIS AntS2.0 interface and ISIS solar panel sensor interface and data readout. The 4-cell battery pack can be placed freely in the stack, further custom configurations upon request.

Output voltage domains VDO: 5V
VD1: 3V3
VD2: user selectable (type C with Daughter board)
Main bus organization Unregulated bus
Functional protection Emergency Low Power Mode (when Bus voltage low)
Hardware Supervisor including Watchdog
Firecode stack reset capability
On board housekeeping measurement
Electrical protection Overcurrent/thermal limit on Unit input on each output bus channel:
– overcurrent/thermal protection
– reverse current protection
Communication interface I²C