A high power transistor frequency conversion power supply

Abstract

The utility model discloses a variable-frequency power supply of high power transistor, mainly comprising a three-phase bridge rectifier circuit, a plane-wave filter circuit, a combined contravariant bridge circuit and a control protection circuit. The utility model is characterized in that the three-phase power-frequency alternating current is converted into the direct current by connecting with an output power via a load circuit, and then the direct current is contradictorily converted into a single-phase high frequency alternating current. With high power electrical and electronic element, the utility model has the advantages of wide frequency application range, high power output and high power frequency, meeting the process requirement of the modern heat treatment. The power frequency of the utility model covers the intermediate frequency band and the superaudio frequency band, no special starting circuit is required and the inversion efficiency is high, therefore the application prospect is wide.

Description

Technical field: [0001] The invention relates to a power supply, in particular to a high-power transistor frequency conversion power supply. Background technique: [0002] With the continuous progress and improvement of the manufacturing process and technology of modern power electronic components, a brand-new switching device is being widely used, especially in the field of induction heating, which has greatly improved the heat treatment technology of metal materials and components. To improve, this switching device is an insulated gate transistor, or IGBT for short. This device has the characteristics of high input impedance, fast switching speed, good thermal stability, simple driving circuit, low on-state voltage, high withstand voltage and large current, and is widely used in modern inverter technology. . [0003] The application of the present invention is mainly in the technical field of surface heat treatment of metal materials, and the induction heating equipment ...

AI Technical Summary

Problems solved by technology

The traditional thyristor variable frequency power supply needs to set up a special start-up circuit, which requires forced commutation and has a long switching time, high switching loss, low efficiency, low switching frequency (not exceeding 8000 Hz), and a low start-up success rate, so it cannot meet modern metal heat treatment requirements. Process requirements

Another traditional electronic tube super audio power supply equipment is gradually being replaced due to its low efficiency, high energy consumption, and high risk of high output voltage.

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