Comparison of new insulated gate bipolar transistor (IGBT) intermediate frequency power supply and thyristor intermediate frequency power supply and generator set

New Insulated Gate Bipolar Transistor 8 Medium Frequency Power Supply and SCR Medium Frequency Power Supply and Generator Set Comparison Zhongke Ningbo Ke Ningda Industrial Co., Ltd., Zhejiang Ningbo 3158, 31 Main business network, power supply in the smelting of boron Application and comprehensive performance comparison. Introducing the new type 1! The performance of the power supply has the same effect and the same effect. 1 The development of IF source in China began in the production of shovel permanent magnet materials in the late 1980s, while the medium frequency induction heating and melting furnaces were widely used in the early 1970s. The medium-sized smelting furnace mostly uses the intermediate frequency generator set as the power source. The unit is driven by the AC motor to convert the phase power frequency power supply into a single-phase 3752500 output intermediate frequency power supply. The advantage is that the fault judgment is simple and the scribing rate is low, and the anti-interference performance is strong. The disadvantages are large volume, high noise, high maintenance cost, long maintenance period, and low power loss of the power grid. The capacitor needs to be switched when adjusting the power. The operation is inconvenient. In the early 1990s, the high-power thyristor has developed quite mature. Moreover, the numerical control circuit and the computer intelligent chip have made a long-term development, and the thyristor frequency power supply has developed rapidly. For example, Zhejiang Zheda Yi Shanghai Huadian Jinzhou Special has successively introduced the thyristor intermediate frequency power supply, which reduces the use of light load. The operation of the electric loss thyristor intermediate frequency power supply is to convert the phase power frequency alternating current into direct current power, and then change the direct current power from an inverter tube to a ugly But the circuit also exists, lacking. The control circuit is relatively complicated, the anti-interference ability is poor, the maintenance technology is high, and the startup is difficult.

In the late 1990s, the new high-Power Transistor 108 tube was successfully trial-produced, making the intermediate frequency power supply in the inverter circuit. With new breakthroughs, Kemu overcomes the shortcomings of starting idle, and some manufacturers change the original series inverter to parallel inverter, so the phase controllable full-bridge circuit is changed to phase-Bridge Rectifier in the original circuit. The control circuit is greatly simplified, and the maintenance is more convenient. 2 New 唧 1 such as the characteristics of the intermediate frequency power supply The insulated gate bipolar transistor is a composite device of the river 03 with a bipolar transistor and a 01 珥 high power transistor. Therefore, it has several advantages, such as high speed, high input impedance, high driving circuit and good thermal temperature. It also includes 01 large current carrying capacity and blocking rolling pressure. It is a replacement; Switching device. From 1986 to the present, especially in recent years, 1081 has developed rapidly. At present, it has been widely used in various inverters. The intermediate frequency power supply of the company's Taiwan 251 smelting furnace has been transformed into a new development of Zhangjiagang Digong. The 601 Xunding Power Supply now introduces its application effects.

The clamping system adopts the guide width and frequency to realize the intermediate frequency power supply with stepless adjustment of the output power into the hall, and adopts series resonance. It does not need to add the starting circuit and the front stage voltage regulating device, so the startup is quite convenient, and the startup success rate is 100%. Adjusting the output power is extremely good. Because the rectifying part adopts the phase full bridge circuit, the control circuit is extremely simple, the maintenance technology is reduced, and the life of the mountain is in the frequency of 30,000 times. 1. The tube adopts the German internal, and adopts The voltage-limiting over-current and over-voltage protection circuit has a very low failure rate, and the over-current over-voltage protection action alarm immediately alarms, the intermediate-frequency capacitor loss is 4, plus the excitation of the parent 1.=6 apparently the integration of electrical energy The utilization efficiency is too low, and a lot of power is wasted. The efficiency of the thyristor intermediate frequency power supply is about 93. The efficiency of the intermediate frequency isolation transformer is 0.85, then its comprehensive efficiency and 1 intermediate frequency power supply, it completely adopts the cooling method of self-cooling or air cooling. The overall efficiency of the power supply can reach 95 or more, and the power factor is 92 in the whole adjustment process, which greatly captures the high efficiency and is superior to the former two.

3.2 Comprehensive performance 4 The design and layout of the whole equipment is reasonable, small in size and light in weight, eliminating the new 8 of the water cooling system! Comparison of intermediate frequency power supply and thyristor intermediate frequency power supply and intermediate frequency unit 3.1 Efficiency For medium frequency furnace, the higher the frequency, the more efficient the electrical efficiency is for the 25 frequency induction melting furnace. At 2500 hours, the efficiency of the furnace is about 0.85, and the efficiency of the intermediate frequency unit. 3.3 Energy-saving effect estimation The efficiency of the 001 thyristor intermediate frequency power supply is 79. The 601-sinking 1 intermediate frequency power supply is 95. If the foot is melted by the same amount of the NdFeB frequency unit, then the thyristor intermediate frequency power supply needs to be recognized by 772. Jia electric energy, while the intermediate frequency power supply only needs to use 642 electric energy. The town medium frequency power supply is better than the thyristor frequency power supply medium frequency unit energy saving advantage. The station is now about 0.85, and the medium frequency autotransformer water cooling loss is used for the power supply every day. 10, 50 meters per hour electricity IF generator thyristor IF power supply old IF power supply cost epoch volume large large small weight kg noise large large power factor efficiency 0.79 with voltage change overload performance is good Good characteristic difference, automatic tracking of the natural frequency of the furnace, harmonic interference, no high, no adjustment range, small starting characteristics, star angle start calculation, the intermediate frequency unit uses 182,500 thyristor intermediate frequency power supply for each year, 14,9,9 If you press each earth power. 6 yuan calculation, 8 IF source per year saves 39190 8 yuan than the IF unit, which saves more than 14235 yuan than the thyristor IF power supply. The reactive power loss is not included in the calculation. If it is added, the ratio of the intermediate frequency power supply is stronger. The medium frequency power supply of 101 is an inevitable trend in the development of power electronics technology as a medium frequency induction heating power source for heating and annealing heat treatment. It will become an important symbol of the modernization of the heating industry in the tenth century.

Acknowledgements Thanks to Zhangjiagang Tonggongtong for providing this article with a lot of real data and support in equipment transformation.

1 Li Aiwen, Zhang Chenghui. Modern Inverter Technology and Its Application Beijing Science Press, 2000, 9.

In the electronic class + industry of Zhejiang Radio and Television University, he entered the factory for electrical work in the past 75 years, especially since 987, he has been engaged in the management of electrical equipment for magnetic materials. He won the provincial and municipal science and technology progress award for the domestically-made technical transformation of imported equipment, and was lasted on page 25 for 39 pages.