1、Medium frequency power supply
（1）、Principle of work
Through the three-phase AC power supply through the three-phase bridge rectifier, become adjustable DC power supply, through the reactance filter, filter after losing to the single phase inverter bridge, Through the pulse control, make single bridge diagonal alternation switch become single-phase 1000hz intermediate frequency current. Resonance circuit is made by induction coil and compensation capacitor composition, and the current to the induction coil .The sensors in metal charge generating vortex, then heated to melting furnace
（2）、Main components—silicon-controlled rectifier ：
The silicon controlled my company used is main procurement in Hubei TECH Semiconductors Co., Ltd. (TECHSEM)、Hangzhou Hanan Semiconductors Co., Ltd and Zhejiang Sifang Semiconductors Co., Ltd, the three companies above are China silicon manufacturing industry leader, the production of the silicon controlled quality and stability, have a strong ability of anti impact current，not easy to damage, 20%~30% higher price than the same industry.
（3）、Main components—the main control circuit board：
Parallel SCR intermediate frequency power supply used in circuit board, it is my company independent research and production, research and development engineers timely update and improvement of circuit board that guarantee the company in the industry leading level; production welding circuit board all through my company profession quality inspection personnel test and check one by one, to eliminate substandard products sold out and ensure that the equipment safety.
（4）、Main components—circuit breaker：
My company uses the circuit breaker in the procurement of Shanghai people Electric Appliance Switch Factory. This company was founded in the nineteen seventies, it is the production and sales of high and low voltage electrical appliances, instruments and meters, complete set of power transmission and distribution equipment, high voltage electrical components, building electrical appliances, wire and cable products research and development, production, sales and services for the integration of a manufacturing enterprise. This enterprise won the "Chinese enterprise image AAA level enterprise", "Chinese famous quality products", "China hundred outstanding enterprise" and so on the title.
2、Capacitor device：
（1）、Principle of work
Capacitor cabinet and the induction coil connected in parallel to compensate for the induction coil of the inductive reactive power, at the same time with the coil to form a resonant circuit to achieve proper frequency and equivalent impedance. After compensation, intermediate frequency power supply need only provide required load active power and a small amount of reactive power, intermediate frequency power supply capacity can greatly reduced.
High power induction furnace needs a large amount of compensation capacitor, in order to reduce the occupied space and electromagnetic leakage. My company's capacitor cabinet adopts a unique double installation mode. Large current water bus use special mold custom, water cooling chamber and a molded copper, No welding, therefore no oxidation, water cooling and the conductive efficiency is high.
（2）、Main components—electric capacitor
Capacitor cabinet used to compensate the reactive power of induction coil, At the same time with the coil to form a resonant circuit, to achieve proper frequency and equivalent impedance. After compensation, intermediate frequency power supply only need to provide the required load active power and a small amount of reactive power. Intermediate frequency power supply capacity can be greatly reduced. The electric capacitor my company used is main procurement in Xin'An River Power Capacitor Limited and Hangzhou keang power & electrical apparatus Co., Ltd. These two companies are famous for domestic electric capacitor production enterprises, registered capital of over RMB20000000. Because of its first-class quality, overvoltage capability, win the user's consistent high praise in the long-term process of applications
3、Coreless induction furnace aluminum furnace
（1）Principle of work
Intermediate frequency electric furnace complete sets of equipment is change the frequency of 50HZ alternating current into intermediate frequency（more than 250HZ to 2500HZ），the three-phase alternating current into direct current, after the rectification, the DC power into the adjustable frequency current, Supply consists of a capacitor and an induction coil in the intermediate frequency alternating current flowing, to produce a high density of lines of force in the induction coil, and cut the metal materials filled in the induction coil, in metal materials they will have a great eddy current. It based on the principle of electromagnetic induction heating metal. Use of intermediate frequency power supply establishment of intermediate frequency magnetic field, the ferromagnetic material generated internally induced eddy current and heat to achieve the heating material for the purpose. Intermediate frequency electric furnace uses 250-2500Hz medium frequency power supply for induction heating and melting heat. Intermediate frequency electric furnace for smelting steel, alloy steel, special steel, can also be used for copper, aluminum and other non-ferrous metal smelting and extraction temperature. Equipment has the advantages of small volume, light weight, high efficiency, less power consumption, melt fast temperature rising, the furnace temperature is easy to control, high production efficiency.
My company produces aluminum shell furnace use thickening type high purity aluminum panel, can be used for a long time without deformation, stable.
（2）Main components—induction coil
Induction coil used in type T2 (99.9% purity electrolytic copper), wall thickness ≥ 4.5mm extrusion of rectangular tube in the special die winded, It ensures the coil of the rigid, and also has the most conductive section. According to the ISO431-1981 standards for selection of coil material, reach minimum copper loss and high electromagnetic conversion rate.
Induction coil made of high temperature resistance, high pressure resistance insulating paint, insulation grade reaches H grade. Induction coil before they leave the factory will after 12kg/cm2（Schematic diagram for the water pipe and the induction coil connected）hydraulic pressure test 36 hours and 7000v withstand voltage test, there is absolutely no water leakage phenomenon
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