Static Frequency Converter Systems
EnerVolt Power Solutions offers advanced Static Frequency Converter (SFC) systems designed to supply stable and precise AC power to equipment that must operate at a frequency different from the utility mains. These systems are ideal for critical industrial, aviation, defence, laboratory, and test applications where frequency accuracy, waveform purity, and reliability are essential.
EnerVolt frequency converters transform standard 50 Hz utility input into alternative operating frequencies such as 60 Hz, 400 Hz, or 83â…“ Hz, ensuring full compatibility with specialised loads. The conversion is achieved using a true double-conversion topology, which completely decouples the output from mains disturbances and load-generated harmonics.
Operating Principle
The EnerVolt Static Frequency Converter performs power conversion in two controlled stages:
- AC–DC Conversion
The incoming AC supply is processed through a robust rectification stage, producing a stable DC link. This stage is designed to withstand wide input voltage and frequency variations while maintaining high reliability under demanding load conditions. - DC–AC Inversion
The regulated DC energy is then converted into a precisely controlled AC output using high-performance IGBT-based PWM inverter technology. Advanced digital control algorithms generate a clean, low-distortion sine wave at the required output frequency.
An output isolation transformer ensures galvanic separation between input and load, enhancing safety, noise immunity, and system robustness.
Key Characteristics
Electrical Performance
- Three-phase, full sine wave output
- Selectable output frequencies: 50 Hz / 60 Hz / 83â…“ Hz / 400 Hz
- High crest factor capability for demanding non-linear loads
- Very low total harmonic distortion (THD)
- Stable voltage and frequency regulation under dynamic load conditions
Power Electronics & Control
- High-efficiency IGBT inverter modules with high-frequency switching
- Thyristor-based rectifier stage for proven durability
- DSP-controlled digital architecture for precise waveform synthesis
- Online double-conversion operation for uninterrupted output quality
System Reliability
- Designed for continuous duty operation
- Excellent performance with inductive and non-linear loads
- Intelligent thermal management with variable-speed fan control
- Long service life with reduced maintenance requirements
Monitoring, Interface & Communication
EnerVolt frequency converters are equipped with an intuitive LCD-based front panel, allowing users to view operating parameters, alarms, and system status in real time. All critical settings can be configured locally without additional tools.
Available communication and control features include:
- Programmable dry contacts for alarm and status signalling
- RS-485 communication interface
- MODBUS protocol support for SCADA and BMS integration
- PC-based monitoring, configuration, and event log retrieval
- Remote start/stop and centralized control capability
Protection & Safety Features
To ensure maximum operational security, the system incorporates comprehensive electronic protections, including:
- Input and output overvoltage protection
- Overload and short-circuit protection
- Overtemperature monitoring and shutdown
- Controlled DC bus with optional battery integration
- Automatic fault reset with programmable restart logic
Cold start capability enables system operation even in the absence of mains power when battery support is available.
Compliance & Applications
EnerVolt Static Frequency Converters are engineered in accordance with international and applicable local standards, ensuring safe and compliant operation across global markets.
Typical applications include:
- Aircraft ground power systems
- Industrial motor test benches
- Defence and radar equipment
- Research laboratories
- Export machinery requiring frequency adaptation
- Critical infrastructure with specialised AC power requirements