EKF - Short Profile
EKF - Short Profile


In-Line Board Mount Uninterruptible Power Supply

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CompactPCI® Serial • Board Mount UPS

The SRU-UPS is a power backup unit, housed on a 100x160mm2 Eurocard, suitable e.g. for CompactPCI® Serial backplanes or other 19-inch based systems. Intended for use in addition (in-line) to a PSU, it can be regarded as uninterruptible power supply (UPS).

The SRU-UPS can pass through up to 60W (12V/5A) from its power input to the CPU board and peripheral cards, reasonable for small to medium systems. When a power fail situation occurs, the SRU-UPS sustains full power on its output for >10s, sufficient for a normal shutdown of the operating system without loss of data.

The SRU-UPS is also a backup solution for short power failures. During normal operation, the input voltage is forwarded to the SRU-UPS output with a small loss of <0.3V. When the UPS detects an under-voltage condition (<11.5V) on its power input, output power will be generated by a DC/DC converter instead, derived from an array of on-board ultra capacitors.

The SRU-UPS is equipped with a PwrBlade® backplane connector. EKF offers suitable CompactPCI® Serial backplanes with two adjacent PwrBlade® slots for both a removable power supply and the SRU-UPS card.

SRU-UPS - Photo Soon Here

Feature Summary

  • General
    • Single size Eurocard 3U 100x160mm2
    • Front panel width 8HP
    • PwrBlade® backplane connector (+12V input, +12V output)
    • Recommended backplane position adjacent to the power supply
    • Non-standard dual power slot backplane required (in-line operation)
    • Custom CompactPCI® Serial backplanes available
  • UPS
    • In-line operation, mounting position between power supply slot and CompactPCI® Serial slots
    • Normal operation is +12V input to output bypass mode
    • Backup operation is automatically entered when input power failure occurs
    • Input voltage 12VDC (11.6VDC to 16VDC)
    • Input current 5.8A nom.
    • Output power 60W both modes normal (bypass) and backup
    • Output voltage normal (bypass) mode VIN - 0.3V @100% load
    • If possible, adjust input voltage to +12.3VDC for compensation of voltage loss
    • Output voltage backup mode +12VDC 2%, ?30mV ripple, 97% efficiency typ.
    • Backup time vs. load current @25°C typ. 14s @5A, 20s @3.5A, 35s @2A, 70s @1A
    • Power fail detection when input voltage falls below +11.5VDC
    • Backup power source on-board super capacitors 4 x 100F
    • Intelligent capacitor charge sharing
    • Charge current up to 6.2A depending on output load
    • Charge time w/o output load <60s
    • Charge time w. full output load ~150s
    • Operating temperature -20°C to +70°C
    • Option power fail output signal
  • Special Features
    • FCI/Amphenol PwrBlade® backplane header, 9 x power 24 x signal contacts
    • Pin assignment similar to nVent and Trenew removable power supplies (AC contacts = NC)
    • COTS CompactPCI® Serial backplane available with two adjacent (8HP pitch) PwrBlade® slots for removable power supply and and SRU-UPS (EKF part no. 932.8.04.998)
    • Backplane usage is scalable - if an UPS is not required power supply can be moved into UPS slot
    • Custom backplane solutions CompactPCI® Serial or other Eurocard based available on request
    • Front handle micro-switch can be used as system power button replacement
  • Applications
    • Short time backup solution e.g. bridging the time gap from general power failure to emergency generator startup
    • Can be used to backup the system until normal shutdown of the operating system has been accomplished (shutdown initiated by power fail output signal from PSU or UPS)
    • System reliability enhancement for critical mains supply
  • Environmental & Regulatory
    • Designed & manufactured in Germany
    • Certified quality management according to ISO 9001
    • Long term availability
    • Rugged solution (coating, sealing, underfilling on request)
    • RoHS compliant
    • Operation temperature -20°C to +70°C
    • Storage temperature -20°C to +70°C
    • Humidity 5% ... 95% RH non condensing
    • Altitude -300m ... +3000m
    • Shock 15g 0.33ms, 6g 6ms
    • Vibration 1g 5-2000Hz
    • MTBF tbd years
    • EC Regulations EN55022, EN55024, EN60950-1 (UL60950-1/IEC60950-1)

SRU-UPS - Simplified Block Diagram

SRU-UPS - Simplified Block Diagram
Ordering Information
Please refer to List 21 for popular SKU
EKF is an ISO-9001 certified company
EKF Elektronik GmbH • Philipp-Reis-Str. 4 • 59065 Hamm • Germany
Phone +49 (0)2381/6890-0 • Fax +49 (0)2381/6890-90 • E-Mail