Factory Outlets 6319RZ1 Conveying equipment for Macedonia Importers

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  • VERY FIRST PROTOTYPE, this is my first field test, not recommended to build! It is very unstable as you might seen from my third video.
    Concept image : https://c2.staticflickr.com/4/3668/33257290015_177ba11163_o.png

    – Transformer coupled series resonant induction heater –

    Induction heaters need a lot of power, this power can be only delivered efficiently with high voltage, any industrial IH uses single or three phase mains.
    Low voltage is only good for prototyping. Using a lab power supply provides benefits like voltage and current limiting, so you don’t blow up your parts by mistake.

    Series resonant tank properties :
    Resonant frequency (empty coil) = 45kHz
    Capacitance = 5µF
    Stray inductance = 0,6µH
    Coil inductance = 1,9µH
    Overall inductance = 2,5µH
    Max Capacitor voltage = 650Vrms
    Max estimated current = 1000Irms

    The voltage fed full bridge inverter is a very important part of the system, it converts the DC into high frequency. For that it needs a proper gate drive, cooling, decoupling caps and more probably.

    Also important for efficient switching is dead time to prevent cross conduction.

    The gate driver is not that good currently, no doubt since it’s my first one that I got working.
    Following image shows the distorted gate-source voltage of one mosfet, yellow waveform = gate voltage, blue = drain voltage

    https://c1.staticflickr.com/9/8035/29299132080_3c7fe152b3.jpg

    Parts used :

    1. -Oscillator-
    NE555P Timer
    10k Trimmer Potentiometer
    5k Multi Turn Potentiometer 3600°
    270ohm Resistor
    5600ohm Resistor
    3,3 nF Capacitor
    1 nF Capacitor

    2. -Signal Amplifier-
    1x 1200ohm Resistor
    2x BD681
    2x BD190
    2x 470uF Capacitor
    1x IRF4905
    1x IRFZ46N *

    3. -Gate Drive Transformer-
    1x small ferrite toroid core
    4 Different colored wires (easier to distinguish)

    4. -Fullbridge Inverter-
    1x Stripboard
    4x PCB terminal blocks with 3 connectors
    1x AMD 6850 Heatsink
    1x Full bridge rectifier = KBPC3510
    4x Epcos 1000uf 400v electrolytic capacitor
    4x IRFP360
    4x TO-247 Mica sheet isolator
    2x Wima 400V 100nF
    2x 220uF 400V electrolytic capacitor
    4x M3 mounting screws

    5. -Gate resistor-
    4x 47ohm

    6. -LC Tank Circuit-
    50x Wima FKP1 100nF 1600DC 650VAC
    - 15mm Soft copper tubing (workcoil)
    - 15mm straight copper tubing
    2x 15mm 90 degree fittings
    2x 15mm threaded fittings
    2x Copper sheet 10x50cm

    7. -Impedance Matching Transformer-
    4x Epcos ferrite toroid core B64290L82X830
    1x Medium gauge insulated wire

    8. -Water cooling-
    1x Rotek PUM292
    1x Vinyl tube 14mm inner 18mm outer diameter
    2x Brass hose nipple

    9. -Operation on 2300W-
    Mains with 230VAC
    Autotransformer RFT Stelltrafo LSS 010

    Max temperature of the workpiece estimated from the color = 1400-1500°C

    *References*

    http://www.sms-elotherm.com/images/fachberichte/en/EloMat-01-2013-fb_zok.pdf

    http://inductionheatertutorial.com/

    http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat1.html

    http://uzzors2k.4hv.org/index.php?page=pllinductionheater1

    http://danyk.cz/induk3_en.html

    http://4hv.org/e107_plugins/forum/forum_viewtopic.php?168388?

    http://4hv.org/e107_plugins/forum/forum_viewtopic.php?140297



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