The Study And Design Of The Efficient, Energy-saving And Multi-supply Mid-frequency Power Supply Of Induction Heating

Along with the enhancing of people's environmental protection consciousness, and the need of foundry and metallurgy for the high-power induction calefaction equipments, it has been one popular spot among the community to research and develop power supply for induction calefaction, which characteristics of high-power, high efficiency and environment-friendly.The aim of the paper is to research and develop a new, high-power, high efficiency and energy-saving intermediate frequency power supply for induction heating. With the cooperative company, we research on designing a power supply for induction heating, which can supply three electronic furnaces. The power supply equipment improves the limit of traditional one power supply for one electronic furnace mode, and enhances the manufacture ability of the metallurgy and foundry industry sharply. The rectification circuit part of the power supply is the 12 pulse wave uncontrollable circuit, and the power factor of the electric network is more than 0.95. This leads to less harmonic waves pollutions. By adopting a half-bridge series resonance circuit made up of with KK as the inverse variation part, we solve the difficulty of startup of the tradition parallel resonance circuit. The controller is AVR, using digital PI algorithm to control the power supply, monitors the load matching, and achieves the digital control of the inverse. This improves the complexity, difficulty maintenance, discommodiously control the power of the analog circuit. The control systems of the power supply for three electronic furnaces are made up of PC as host computer. PC controls three AVR inversion controller by CAN bus, and makes controlling the locale information in time comes true.This whole system has many characteristics besides supplying high power, for example power output arbitrarily changed, expediently started, high power factor, less harmonic waves and less pollution for power-network. The intermediate frequency power supply equipment for induction calefaction has many meanings for energy sources, circumstance and the need of the industry.