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What is an intermediate-frequency heating power supply? What kind of device is it, and what is its operating principle?
Sep 08,2020
IGBT inverter Medium-Frequency Induction Heating Power Supply This is a newly developed, upgraded product that fully leverages our factory’s strengths in power conversion technology. Its most prominent advantages are: energy efficiency, with an overall conversion efficiency of 85% (90% when paired with a dedicated furnace body); strong adaptability to various furnace bodies (inductors); and the highest performance-to-price ratio. Working principle: The three-phase power supply is rectified by a bridge uncontrolled rectifier and then filtered by an LC filter to produce a 500V DC operating voltage. Since this is an uncontrolled rectifier, the rectifier diodes always operate at their maximum conduction angle, which ensures a high power factor. The core component of this equipment—the inverter—is composed of high-power IGBT half-bridges. A phase-locked loop controls the operating frequency, automatically tracking changes in the furnace body’s natural frequency and other parameters, thereby keeping the IGBTs operating in zero-voltage switching mode, minimizing losses and ensuring a wide safe operating range. The output power is controlled by a PWM circuit, and a closed-loop control system is implemented using a power detection circuit. In this equipment, the output capacitor is connected in series with the furnace body, rather than in parallel as is typically done in conventional thyristor inverters. This configuration is adopted because: the series connection better suits the voltage-type inverter characteristics of IGBTs; the length of the furnace body leads affects only the operating frequency with minimal impact on efficiency; and it is more compatible with built-in capacitors. Of course, under no-load conditions, the series connection can result in very high voltages due to the high Q value. However, this issue is effectively addressed in our equipment thanks to its excellent overvoltage protection and control features.
The thyristor intermediate-frequency power supply is a static frequency converter that uses thyristor components to transform a three-phase 50/60 Hz power supply into a single-phase intermediate-frequency power supply. This device exhibits strong adaptability to various types of loads and has a wide range of applications, primarily in the melting, holding, sintering, welding, quenching, tempering, through-heating, purification of molten metals, heat treatment, pipe bending, and crystal growth of different metals. The standard output power series of this device are: 30 kW, 50 kW, 100 kW, 160 kW, 250 kW.
350 kW, 400 kW, 500 kW, 750 kW, 1000 kW, 1250 kW, 1500 kW, 2000 kW, 2500 kW, 3000 kW, 4000 kW
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Kangda Electric Furnace specializes in the manufacture of the following equipment: KGCL series medium-frequency power supplies, KGPS series medium-frequency power supplies, GTR series medium-frequency induction heating furnaces...
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Address: Yuhe Industrial Park, Weicheng District, Weifang City, Shandong Province
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