Series-connected intermediate frequency power supply

Our series resonant design can easily realize dual power supply and multi-power supply melting systems, with the most common and typical being the dual power supply system.
　　The series resonant dual-output power cabinet, together with two furnace bodies, forms a one-power-two-furnace melting system. The output power can be steplessly and arbitrarily distributed between the two furnace bodies, allowing simultaneous power supply to both furnaces—one for holding temperature and the other for melting—without the need for external switching devices to select the furnace. Our series resonant design ensures continuous and stable operation of the equipment with a wide load matching range. The rectifier section of the power cabinet adopts a fully open design, achieving the highest power factor and low harmonic distortion. The 12-pulse and 24-pulse multi-pulse designs further reduce higher harmonics. The unique rectifier trigger board design ensures current balance among the input phases, implements soft start to prevent power surges, and quickly cuts off power in case of faults. Digital signal transmission is fully realized through optical fiber, providing strong anti-interference capability and making the system more stable.
　　All components of the series resonant dual-output medium frequency power supply are installed inside a closed cabinet. The copper bars and copper pipes inside the power cabinet use well-known domestic brands; the copper bars are sandblasted, passivated, and manufactured according to standards. The layout of components in the power cabinet is reasonable, facilitating maintenance, wiring, and neat cable management. Maintenance personnel can easily access all maintenance points. An isolation switch is installed between the rectifier and inverter. In case of inverter failure on one side, the fault can be isolated, and the power supply on the other side can continue to operate. The power cabinet is also equipped with a melting manager. The PLC and human-machine interface form a convenient melting manager with functions including automatic furnace drying, cold furnace start, fault diagnosis, fault information display and storage, operation information display, and system status display. A sealed isolation control room is arranged at the upper part of the front door, equipped with the main control board, feedback board, control power supply, and other control components, allowing easy observation of the main control board signals. The isolation control room does not require additional cooling. The main power electronic components of the power cabinet are water-cooled, and the temperature rise inside the cabinet during operation does not affect the isolation control room. Meanwhile, all electronic components on the electronic control circuit boards inside the isolation control room are selected according to high-temperature grade standards.
　　Equipped with a full-function incoming line air switch protection system. A fast-acting full-function circuit breaker (air switch) is installed on the front of the power supply, operated by an electric operating mechanism, with a 24V undervoltage coil for interlock protection, and includes overcurrent protection. When overcurrent occurs, it trips to protect by cutting off the incoming power supply to the power cabinet. The bridge rectifier section converts AC to DC, providing a stable DC platform for the inverter section. Two sets of series resonant inverter bridges allow stepless and arbitrary distribution of output power between them. Two sets of series resonant capacitor compensation devices meet dual output requirements, enabling simultaneous power supply to two furnace bodies. The capacitors are installed inside a fully enclosed capacitor cabinet made of high-strength cold-rolled steel plates.
　　Also equipped with differential current method and DC injection type furnace leakage test alarm circuits, indicator lights, leakage current meters, and detection control circuits. During normal operation, it continuously monitors. When the following situations occur, the power is cut off:
　　1) Metal penetrates the furnace lining to the induction coil;
　　2) Excessive moisture inside the furnace lining;
　　3) Individual electrical components have low resistance to ground.
　　Since the coil is wound integrally with oxygen-free copper tubes, the differential current method and DC injection type furnace leakage alarm circuits protect the entire coil, including the effective coil and the water-cooled coil. The differential current method is an electronic protection with fast response; when a ground flashover fault occurs in the output circuit, the differential current protection can respond at the fastest speed. The DC injection type furnace leakage alarm is a non-electronic protection with relatively slower speed, but it can also detect furnace leakage when the power cabinet stops running. Additionally, Xinyan Industrial can provide complete supporting equipment and various functional options according to different customer configuration needs, allowing you to fully experience the efficiency, convenience, and safety brought by Xinyan products.