igbt half bridge inverter intermediate frequency - super audio frequency - high frequency induction heating power supply

Abstract

The invention discloses an IGBT (Insulated Gate Bipolar Translator) half-bridge inverter medium-frequency - ultrasonic-frequency - high-frequency induction heating power supply. The IGBT half-bridge inverter medium-frequency - ultrasonic-frequency - high-frequency induction heating power supply comprises a three-phase rectifier bridge, an IGBT inverter driver, an IGBT half-bridge inverter, a mainboard PLC (Programmable Logic Controller), a touch screen and a switching power supply. The IGBT half-bridge inverter medium-frequency - ultrasonic-frequency - high-frequency induction heating power supply has the technical effects that 1) constant-power / constant-current control, temperature detection, frequency tracking, zero power start and voltage and current closed loop control can be realized; a fault detection and protection circuit can realize real-time monitoring of, quick response to and real-time display of faults such as overheating, overvoltage, output overcurrent, alternating-current undervoltage, open phase and input overcurrent; 2) a man-machine interface is friendly; 3) the voltage regulation resonant output mode is optional; 4) aiming at different loads, wide-range detection can be realized to achieve the optimum working state; 5) induction heating can be realized within 0.2Khz-200Khz, and the working frequency can be manually selected for fixed-frequency application; 6) for a resonant power supply, the resonant frequency of the current tank circuit can be automatically tracked.

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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