Static Frequency Converter (SFC)

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MAK Solid State Ground Power Unit

Our solid state Ground Power Unit / Static Frequency Converter, is now part of our standard Ground support Equipment and is the safest and most reliable solution for aircraft power supply requirements

Mak's Static Frequency Converter units are designed with Power factor correction to guarantee a perfect sinusoidal input current from 25% to 150% load and a low THDi (<3%)ensuring high quality, maximum efficiency and secure electrical power supplies.


Our Static frequency converter is used to supply voltage and load variations. The output frequency is entirely depend on the elements  which is to control the on/off static devices of frequency converters. So it is totally independent of fluctuations in the frequency & AC voltage. static frequency converter is also works independent of load variations. In induction motor frequency converter.The speed variants sometime because of rotor torque but this will be constant through out the speed range designed by Mak Controls and Systems.

Mak Controls manufacture & designed Static frequency converters have very low installation costs, they don’t require any heavy machinery and careful alignment. It occupies less space and offers low noise compared to mechanical converters with heavy machinery and wide variety of voltage for static frequency converters with a great control due to its independence of voltage power supply variations -SFC

Salient Features

  • CE Mark Certified
  • State of the art semi conductor technology
  • Unity power factor through APFC
  • High efficiency (Up to 95%)
  • Low THDi <2% at linear load
  • Data logging
  • MCU based monitoring and control
  • Green Standby Function
  • Line drop voltage compensation
  • No break power transfer compatibility (NBPT)
  • User friendly control panel
  • IP 54 Enclosures for outdoor use
  • Low noise emission (<65dBA@1m)

Technical Specifications

Voltage : 3 phase 400V/415V AC ±15%
Frequency : 45Hz up to 65Hz± 5%
Voltage : 3 phase 200V AC -400Hz ±1%
Overall Efficiency : 87%-95%
Max. Crest Factor : 1.4:1
4 Quadrant Operation AC Voltage Range : 25% +10%
Efficiency : 93%-97%
Input Frequency Deviation : ±5%
Overload Capacity : 150% Continuous
Inrush Current : None
Overall current limit : 120% Continuous
Static Regulation 0 – 100% load : ± 1%
Dynamic regulation 100% : 5%, recovering to 1%
within 40 ms
Total harmonic distortion : < 2% (Linear Load)
Electronic Limit Overload : 120%@60s;
Overload Capacity (IGBTs) : 150% Continuous
Frequency stability : ± 0.01% Crystal
Load power factor : 0-1
Efficiency : 93%-98%
  • Short circuit proof by electric current limiting and shutdown
Operating Temperature : 0°C to +55 °C
(@100% Load)
Relative Humidity : 10%-100%
Noise Level : < 65 dBA@1 meter
Altitude : up to 2500m without
Note: Due to continuous development, the dimensions, layout, configuration and specifications are subject to change without notice.