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Power regulating device for Jiangsu intermediate f

Release date:(2019-4-29)   Number of clicks:60
Technical field

The utility model relates to a power adjusting device for induction heating, in particular to a power adjusting device for an intermediate frequency induction heating furnace with high power factor.

Background art

At present, the parallel inverter type intermediate frequency power supply is widely used in Jiangsu intermediate frequency induction heating field。 The power adjustment method is more common to change the control angle Alpha of the three-phase bridge type full-control rectifier device so as to change the DC output voltage and achieve the purpose of adjusting the output power。 The power factor COS Phi of its rectifier circuit = COS (Alpha+Gamma/2), where Alpha-control angle and Gamma-commutation angle。 In other words, when the commutation angle Gamma is constant, the power factor COSφ Phi decreases with the increase of Alpha。 When the equipment works, it must ensure that the rectifier circuit has the appropriate power factor COSφ Phi, so it is not suitable to work in the deep control state。 In the working process of the intermediate frequency power supply of the existing intermediate frequency diathermy and smelting heating device, the time when rectification is in a deep control state only accounts for a very small proportion, so at present, even large-capacity intermediate frequency power supply has not taken any measures to this effect。 However, when there are different heating temperature requirements, especially when the required heating temperatures differ greatly, for example, when the workpiece is subjected to medium frequency quenching and tempering treatment, the medium frequency power required by the quenching and tempering temperatures differ by more than two times。 If the same set of inductors is used for quenching and tempering, and the power is adjusted by changing the rectification control angle Alpha, then the power factor will be greatly reduced and the equipment will not be allowed to work in this state for a long time。

Summary of the Invention
The utility model aims to solve the problem of providing an intermediate frequency induction heating power adjusting device which can adjust power in a larger range under the condition of maintaining a high power factor.
The technical scheme for solving the above problems is that the provided intermediate frequency induction heating power regulating device comprises an inverter resonant circuit consisting of a capacitor bank and an inductor. The utility model is characterized in that the capacitor bank comprises a first capacitor bank and a second capacitor bank, the first capacitor bank is connected in series with the inductor and then connected in parallel with the second capacitor bank, and switches capable of shorting the capacitors of the bank are arranged at both ends of the first capacitor bank. That is, the first capacitor bank and the inductor are connected in series to form a series resonant circuit, and the capacitors of the first capacitor bank can be switched in different combinations through the switch, so that the voltage at both ends of the inductor can be changed, and the purpose of adjusting the heating power of the inductor is achieved.
The above switch may be a switch that shorts all capacitors of the first capacitor bank or a switch that shorts some capacitors of the first capacitor bank.
For high-power medium-frequency heating devices, the above switch is preferably a water-cooled switch.
The utility model has the advantages of small investment, high efficiency, simple structure and reliable operation. In addition, the utility model also has the advantages that the series inverter is easy to start and the load adaptability of the parallel inverter is good, in particular, an economical and reasonable inductor coil voltage can be obtained by reasonably configuring the ratio of the series capacitor to the parallel capacitor under the condition that the intermediate frequency transformer is not needed.
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