IGBT Medium-Frequency Power Supply
IGBT medium-frequency power supplies are suitable for furnace systems with power ratings ranging from 100KW to 10,000KW. Compared to silicon-controlled rectifier (SCR) medium-frequency power supplies, our unique IGBT medium-frequency power supplies offer higher energy efficiency. They are designed with full rectification diodes, high power factor, and lower harmonic levels, providing significant advantages over traditional medium-frequency power supplies.
Our unique design ensures high startup success rates, achieving full power output under any furnace condition, significantly enhancing the equipment's production efficiency. Multi-layer protection guarantees the safety of the equipment. The IGBT power supply can support one-to-one, one-to-two, and one-to-N melting systems to meet various different application needs.
The 12-pulse and 24-pulse multi-pulse design of the power cabinet further reduces higher-order harmonics. The design ensures current balance between the incoming lines of each phase, while implementing soft start to prevent power surges and quickly cutting off power in the event of a fault.
All signal transmission in the digital system is achieved through fiber optics, boasting strong anti-interference capabilities and enhanced system stability. All components of the IGBT medium-frequency power supply are housed in a sealed cabinet. The copper bars and tubes inside the power cabinet are sourced from renowned domestic brands, with the copper bars sandblasted and passivated according to strict manufacturing standards. The layout of the components in the power cabinet is reasonable and designed in a modular manner for easy maintenance and cable management. Repair personnel have easy access to all maintenance points.
The power cabinet is equipped with a melting management unit. The PLC and human-machine interface form a user-friendly melting management unit with features including: one-touch melting, one-touch maintenance, automatic furnace drying, cold furnace startup, scheduled startup, energy consumption statistics, refractory lining statistics, report creation, safety monitoring, fault diagnosis, fault information display and storage, operation information display, and system status display. A sealed isolation control room is located above the front door, equipped with a main control board, feedback board, and control power, etc., allowing for convenient observation of the main control board signals. The isolation control room does not require additional cooling. The main electronic components of the power cabinet are cool, and the temperature rise within the cabinet during operation will not affect the isolation control room. Additionally, the selection of all electronic components on the electronic control circuit boards within the isolation control room is conducted according to high-temperature ratings.
The bridge rectifier section utilizes diodes to convert AC power to DC, providing a stable DC platform for the inverter section. The capacitors are installed within a fully enclosed capacitor cabinet, constructed from high-strength cold-rolled steel plates. It is also equipped with differential current detection, DC injection, and two-electrode leak furnace test alarm circuits, indicator lights, leakage current meters, and detection control circuits. During normal operation, it continuously monitors.
Turn off the power when the following conditions occur:
Metal penetrates through the furnace lining to the induction coil.
2. There is too much moisture inside the refractory lining.
Some electrical components exhibit low ground resistance.
Due to the overall winding of the oxygen-free copper tube, the entire coil is protected by differential current, DC injection, and two-electrode leak furnace alarm circuits, including both the effective and cold coils. The differential current method is an electronic protection that is quick; it responds rapidly when a grounding arc fault occurs in the output circuit. The DC injection leak furnace alarm is a non-electronic protection that is slower, but it can still detect leaks when the power cabinet stops running. The two-electrode leak furnace alarm circuit is an independent protection device, unaffected by external factors, and can provide one-to-one protection. It boasts high reliability and sensitivity.
