Power Current Controller (PCC) For Engine Starting System

The PCC controls the transient starting torque provided by the DC machine to the engine.

  • Maximum torque is no longer dependent on electrical source, battery temperature, wiring…
  • Applied torque is a slope (no longer a step) to avoid any shaft transient oscillation leading to high torque overshoot (up to 2X in case of poor damping)
  • Provides smooth starting torque
  • Accurate control of the peak torque provided by the S/G or the starter
  • Limits transient under-voltage on HC DC Bus thanks to inrush current limiting
  • In order to optimize the volume of DC/DC converter, we choose DIRECTFET Technology withwith Cooled Direct FETTM on PCB
  • Control : mixed analog + CPLD
  • Efficiency > 90%

Key features

  • 3 phases 115 Volts alternating current(VAC)-variable frequencypower input
  • Active power factor corrector
  • Sensorless motor drive


  • Airbus civil aircraft
  • Boeing civil aircraft



Input voltage

V= 10 to 32 VDC

Output current

500 A

Starting Duration

Three consecutive starts without rest time
High switching frequency (>150 Khz)
Standard protection (short circuit, overheating, overvoltage, EMI)



200 mm


60 mm


150 mm


1 900g



-45°C to +70°C (normal operating conditions)

Certification approvals

ABD 100
EN 2282
DO 160- sect 10

Note: Due to continuous process improvement, specifications are subject to change without notice

Functional diagram