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Recent content by Jagajack

  1. J

    Driver for high power IGBT

    The IGBT I am using is SKM100GB12T4. The gate resistance Ron=5 ohm and Roff=10 ohm. The DC bus voltage is 600 V. Why bipolar gate voltage is recommended for IGBT with gate threshold voltage >5V? 0 to +15 V gate signal could be able to switch the IGBT as desired. Correct me if I am wrong. - - -...
  2. J

    Driver for high power IGBT

    Could 4 optocouplers with individual isolated supply be used to to drive my H bridge?
  3. J

    Driver for high power IGBT

    Thanks for your response. My inverter operating frequency is 10kHz with 50% duty ratio. But how to drive a hide side switch using optocoupler? Is totem-pole a better solution. If so how it could be implemented?
  4. J

    Driver for high power IGBT

    Hi All, I am using a SEMIKRON IGBT for my 5kW H-bridge inverter. Which driver is best for 1200V/100A IGBT gate? 1.Pulse transformer 2.Optocoupler Thanks.
  5. J

    Ringing in H-Bridge inverter

    Thanks FvM. How could I measure correctly with probes?
  6. J

    Ringing in H-Bridge inverter

    Thanks. I tried with 1.5 kΩ in series with both the leads of probe, the waveforms were almost smooth. Is this the correct way of probing? - - - Updated - - - Thanks. I will try with ferrite beads from Fair-Rite. Just I tried 1.5 kOhm in series with probes as suggested in post #7 and waveforms...
  7. J

    Ringing in H-Bridge inverter

    Then MOSFET with lesser Input, Output and Reverse Transfer Capacitance have lesser ringing during switching? Will shortening the gate lead reduce ringing?
  8. J

    Ringing in H-Bridge inverter

    Thanks barry. I will try with ferrite beads. Do Input Capacitance, Output Capacitance and Reverse Transfer Capacitance of MOSFET given in datasheet inluence ringing during switching?
  9. J

    Ringing in H-Bridge inverter

    Hi all, I am designing a H-Bridge inverter for induction furnace application. My DC bus voltage is 400 V and current is 15 A. To start with I used 12 V supply to test my H-Bridge inverter connected to load resistor of 10 Ohm. I used IXFH26N50 from IXYS semiconductor for H-Bridge and the...
  10. J

    Loading effect problem in a circuit

    Hi, If you use a regulated power supply (RPS) you will not face this problem. The RPS should be able to supply at-least 720 mA of current at 30 V. You can easily make your own, a stepdown transformer connected to a rectifier with filter which is connected to voltage regulator could make this...
  11. J

    Designing a capacitive filter for three-phase full wave rectifier

    Hi friends, In am now designing a three-phase full wave diode bridge rectifier with input line voltage of 440V (RMS), 50 Hz. Its output current is 25A. I was not able to get the formula to calculate output filter capacitor for ripple minimization. Please help me to know the formula for filter...
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