The FCX Systems Solid State Frequency Converters are designed for use as a power source to develop Aircraft Quality 400 Hz Power, for use on passenger boarding bridges as fixed apron-mount converters, in cart mounted configuration for flight line or hangar use, and in Central System applications.

The Solid State Frequency Converter is designed to change incoming power at 50 or 60 Hz to aircraft quality power at 400 Hz. The terms solid-state frequency converter, precision frequency converter (PFC), static converter and static frequency changer are used interchangeably throughout the world.  The following paragraph briefly outlines the conversion technique that is utilized to accomplish the frequency change.

Theory of Operation: Series “PFC” Solid State Frequency Converters are designed to change conventional 50 Hz or 60 Hz electrical energy to virtually any other frequency.  The frequency conversion is accomplished in a two (2)-stage process. The first stage converts the incoming alternating supply voltage to a controlled DC voltage (rectification). The second stage inverts the DC voltage to an alternating supply voltage at the desired output frequency (Inversion). In stage #1, the conversion of the incoming alternating voltage to a controlled DC voltage is performed by a three (3) phase, full wave, Thyristor (SCR) controlled bridge rectifier array. The inversion process, stage #2, uses multiple transistorized inverter arrays to produce the desired output frequency. Both stages are controlled by high-speed digital logic circuits equipped with precise feedback systems and redundant alarm networks. The output of the static converter is a sine wave with very low harmonic content.

Configuration: A SCR Full Wave Bridge Rectifier with Phase Capture Feedback Network controls the power SCRs. The power train is equipped with tight tolerance Metal Oxide Varistors and RC snubber circuits to protect the power handling semiconductors and triggering circuit from damaging transient voltages. Incoming transient voltage spikes are suppressed to approximately 66% of the rating of the power SCRS.

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