Intermediate frequency-superaudio frequency-high frequency induction heating power source of IGBT full bridge inversion

Abstract

The invention discloses an intermediate frequency-superaudio frequency-high frequency induction heating power source of IGBT full bridge inversion. The intermediate frequency-superaudio frequency-high frequency induction heating power source comprises a three-phase rectifier bridge, an IGBT inversion driver, an IGBT full-bridge inverter, a main board PLC, a touch screen and a switching power source. The intermediate frequency-superaudio frequency-high frequency induction heating power source has the technical advantages that constant power / constant current controlling, temperature detecting, frequency tracking, zero-power starting and voltage and current closed-loop controlling can be achieved; overvoltage, output overcurrent, alternating current undervoltage, gap, input overcurrent, transformer overheat and other faults can be monitored in real time, fast response is achieved, and real-time displaying is achieved; touch screen displaying and controlling are achieved, and a human-computer interface is friendly; a voltage adjusting resonance output mode, a constant-frequency mode and a constant-voltage frequency adjusting mode can be selected; wide-range detection can be carried out for different loads; 0.2 Khz-200 Khz induction heating is achieved, and the working frequency can be manually selected for the constant-frequency application; the resonant frequency of a current tank circuit can be automatically tracked for a resonance circuit.

Description

technical field [0001] The invention relates to an induction heating power supply Background technique [0002] The traditional power electronic devices used in induction heating equipment are electron tubes and fast thyristors. The electron tube has high voltage, poor stability, strong radiation, and low efficiency. It has reached the edge of elimination, but it has a high frequency and high power, so it still has a place in the market. Fast thyristors are the main force in current applications. They have high withstand voltage, large current, and strong ability to resist overcurrent and overvoltage. But it can only work below 10000Hz, which limits its scope of use. IGBT is a composite power device, which integrates the advantages of bipolar power transistor and power MOSFET. The frequency is high and the component capacity is large. It not only reaches the frequency that the thyristor cannot reach (above 60kHz), but also gradually replaces the fast thyristor. 1kHz ~ 8...

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Problems solved by technology

But it can only work below 10000Hz, which limits its range of use

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