Parallel resonance type three-time boost medium-frequency power supply

Abstract

The invention provides a parallel resonance type three-time boost medium-frequency power supply, which comprises four bridged thyristors, and a serial boost capacitor and a furnace induction coil are sequentially connected in series between the two output ends of the four bridged thyristors. The parallel resonance type three-time boost medium-frequency power supply is characterized in that: a parallel boost capacitor is connected in parallel between the serial boost capacitor and the furnace induction coil which are connected in series, and the capacitance of the parallel boost capacitor is higher than the capacitance of the serial boost capacitor. The parallel resonance type three-time boost medium-frequency power supply has the advantages of simple structure, excellent using effect, remarkable energy-saving effect, good current output effect and constant-power output, and the loss of the furnace induction coil is greatly reduced.

Description

technical field [0001] The invention relates to the field of induction heating equipment, in particular to a parallel resonant triple boost intermediate frequency power supply. Background technique [0002] The thyristor intermediate frequency power supply is a large-capacity power supply commonly used in induction heating equipment. Larger-capacity thyristor intermediate frequency power supplies often use multiple thyristors in parallel in the inverter circuit, because the series operation of multiple thyristors in the inverter circuit will cause difficult technical problems such as off-time coordination and dynamic voltage equalization. It is easier to connect only thyristors in parallel than multiple thyristors in series, but this also causes the output voltage of the intermediate frequency power supply using multiple thyristors in parallel to not exceed 1000V. When this kind of intermediate frequency power supply is used in a system with a large load quality factor Q va...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of traditional thyristor intermediate frequency power supply, such as low voltage, large current, large line loss, and poor economy, and provide a furnace induction furnace that can increase the output intermediate frequency voltage of the inverter circuit. The voltage at both ends of the coil reduces the current of the induction coil of the furnace body and greatly reduces the loss of the induction coil of the furnace body.

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