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High Frequency Induction Heating IGBT Power Supplies

1. Inductive heating power supply applications 

Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, through heat generated in the object by eddy currents (also called Foucault currents). An induction heater consists of an electromagnet, and an electronic oscillator that passes a high-frequency alternating current power supply (AC) through the electromagnet. The rapidly alternating magnetic field penetrates the object, generating electric currents inside the conductor called eddy currents. The eddy currents flowing through the resistance of the material heat it by Joule heating. The frequency of current used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth.
 An important feature of the induction heating process is that the heat is generated inside the object itself, instead of by an external heat source via heat conduction. Thus objects can be heated very rapidly. In addition there need not be any external contact, which can be important where contamination is an issue. Induction heating is used in many industrial processes, such as heat treatment in metallurgy, Czochralski crystal growth and zone refining used in the semiconductor industry, and to meltrefractory metals which require very high temperatures.
 applications including surface hardening, melting, brazing and soldering and heating to fit. Iron and its alloys respond best to induction heating, due to their ferromagnetic nature. Eddy currents can, however, be generated in any conductor, and magnetic hysteresis can occur in any magnetic material. Induction heating has been used to heat liquid conductors (such as molten metals) and also gaseous conductors (such as a gas plasma). Induction heating is often used to heat graphite crucibles (containing other materials) and is used extensively in the semiconductor industry for the heating of silicon and other semiconductors, such as Sapphire growth, Silicon carbide SiC, gallium arsenide GaAs, indium phosphide.  

2. Inductive heating power supply features

• IGBT Insulated Gate Bipolar Transistor modules

• Direct modern replacement for SCR technology

• Support parallel resonance or series resonance

• High Stability: within 0.01%

• Touchscreen HMI

• Support integrating capacitors inside

• Conversion efficiency>95%

• Power Factor >0.95 from 0 to 100% power

• Isolation output transformer

• Front access for serviceability

• Support all remote control options

3. Inductive heating power supply parameters

• Power Range: 30kW-2MW

• Frequency Range: 500Hz – 20kHz

• Resonance: series or parallel

• Stability power within 0,01%

• Input power factor: >0.95

• Efficiency: >95%

• Output regulation: voltage, current or power

• Regulation Accuracy: within ±0.5%

• Output regulation range: 0-100%

• Power requirement: 3 phase 380V, 415V, 480V, 220V, 50/60 Hz

• Protections: over current, over voltage, over heat, input over/under voltage, output overvoltage and over current, driving protections etc

• Remote control options: Analog signal, RS485(MODBUS RTU protocol), Profibus, Profinet.

• Analog Remote control signals:

       -Switch on or off- relay
       -Output voltage 0-10V/4-20mA
       -Output current 0-10V/4-20mA
       -Output power 0-10V/4-20mA
       -Alarm (over current, over voltage, overheat and so on)-relay 

4. Working condition of the Inductive heating power supply 

• Used indoor, ambient temperature:-10?~+40?.

• Phase input: 3 phase unbalance degree less than 5%, meet power quality standards.

• Environment relative humidity:=90%(relative to 20±50?).

• Altitude: less than 2000m.

• Cooling water requirement:inlet water temperature 20?~35?, inlet water pressure 0.1~0.3MPa, outlet water pressure not higher than 0.05MPa. PH value: 6~8; water quality: resistivity 20 kcm; water flow: depends on output parameters.

• There shouldn’t be excessive amount of dust, explosive and corrosive gas in the air.

• The installation place should be without severe vibration, the vertical gradient shouldn’t exceed 5%. The seismic intensity of the installation site is less than 7 on the Richter scale.