FL-KGPS
KGPS Thyristor Power Supply
Rugged SCR parallel-resonance inverter, 100–2,500 kW, built for continuous foundry melting and tolerant of weak or noisy grids. Larger ratings built to order.
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Medium Frequency Power Supplies · FL-IGBT
IGBT Series Resonance Medium Frequency Power Supply, 50–3,000 kW
Solid-state IGBT inverter with high power factor across the load range, low harmonics and fine control — for heating lines and modern melting shops.
- High power factor across the whole load range — no reactive power penalty
- Low harmonic distortion, usually without external filters
- 1% power resolution with temperature and recipe closed loop
- Zero-current switching — low losses, quiet operation
- Compact cabinet, considerably smaller than an equivalent KGPS
- Ethernet interface for remote diagnostics and production data
- Output power
- 50 – 3,000 kW
- Output frequency
- 500 Hz – 200 kHz
- Input voltage
- 380 V / 400 V / 440 V / 480 V, 50 or 60 Hz
- Power factor
- ≥ 0.95 across the load range
- Efficiency
- ≥ 95% at rated load
- THD
- Typically < 5% at the point of common coupling
- Control
- 1% power steps, recipe and temperature closed loop
- Cooling
- Deionised closed-loop water
Model & Technical Parameters
Standard models below. Capacity, power and frequency are matched to your alloy, output and grid at the quotation stage — non-standard ratings are built to order.
| Model | Output power | Frequency range | Typical duty |
|---|---|---|---|
| IGBT-50 | 50 kW | 10 – 50 kHz | Brazing, small part hardening |
| IGBT-100 | 100 kW | 5 – 20 kHz | Bar end heating, laboratory melting |
| IGBT-300 | 300 kW | 1 – 10 kHz | Billet heating, small melting |
| IGBT-500 | 500 kW | 500 Hz – 8 kHz | Forging line, 500 kg melting |
| IGBT-1000 | 1,000 kW | 500 Hz – 4 kHz | Forging line, 1–2 t melting |
| IGBT-1200 | 1,200 kW | 500 Hz – 2 kHz | 2 t steel shell furnace, ≈ 500 kWh/t, one heat per hour |
| IGBT-1500 | 1,500 kW | 250 Hz – 2 kHz | Heavy forging, 3 t melting |
Technical values require confirmation against the final equipment configuration.
Product Details
The IGBT series-resonance topology switches at zero current, so switching losses are low and the unit holds a high power factor from part load to full load. That is the decisive advantage where the utility charges for reactive power or where the site runs on a generator.
Control resolution is far finer than a thyristor unit: output can be set in 1% steps and held against a temperature or a thermal-profile recipe, which is what an induction heating line or a heat treatment cell needs. Harmonic distortion at the point of common coupling is typically low enough to avoid external filtering.
The trade-off is service. IGBT modules are proprietary parts with a longer replacement lead time than a thyristor. We stock modules for every unit we ship and include a recommended two-year spares kit in the quotation.
More Medium Frequency Power Supplies
FL-PS-1D2
One-Drive-Two Power Supply
A single inverter feeding two furnace bodies or two heating stations through an interlocked switching cabinet — melt on one, reline the other.
Read More →Tell us what you melt.
Send your alloy, target output per hour, working hours and grid voltage. You will get a capacity recommendation, a plant layout and a firm quotation — normally within three working days, no obligation.