Intermediate frequency power circuit

Abstract

The invention provides an intermediate frequency power circuit, which comprises a first voltage source, a second voltage source, a first smoothing reactor, a second smoothing reactor, a first resonant capacitor, a second resonant capacitor, a first power device, a second power device, and a furnace induction coil, wherein the first voltage source is connected in series with the second voltage source; the first smoothing reactor and the second smoothing reactor are connected with the first voltage source and the second voltage source respectively; the first resonant capacitor and the second resonant capacitor are connected with the first smoothing reactor and the second smoothing reactor respectively, and are mutually connected in series; the first power device is connected with the first smoothing reactor and the first resonant capacitor, and the second power device is connected with the second smoothing reactor and the second resonant capacitor; and the furnace induction coil is connected between a second node and a fifth node. The intermediate frequency power circuit has the characteristics of higher Q value of a resonator system, and higher power output so as to thicken the furnace wall, greatly improve effective work time of the furnace and reduce production cost. The intermediate frequency power circuit has great significance in the fields of metal melting, induction heating and the like.

Description

technical field The invention relates to the technical field of power circuits, in particular to an intermediate frequency power circuit. Background technique Induction heating furnaces are widely used in metallurgy, smelting and other fields. Compared with traditional arc heating methods, induction heating furnaces are heated by induction, so they have energy saving, low pollution, low gas content in molten steel, less burning loss of alloy elements, electromagnetic stirring and can Accurate temperature control and other advantages. The intermediate frequency power supply for induction heating is a resonant system, and its Q value can be defined as: system reactive power P s and its output real power P R The ratio of Q=P s / P R . When the induction coil passes an alternating current i with an angular frequency ω, the magnetic flux generated by the coil is divided into Φ 1 , Φa, and Φ 2 Three parts, among them, Φ 1 is the magnetic flux passing through the induction c...

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