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    Isolated ground planes on a MCU controlled high voltage IGBT

    I am putting together a PCB that has a CPU to control the on-off state of a high power IGBT. There are two power supplies associated with this: 1) A 24 DC lab PSU that is regulated on the PCB to both 5V (CPU) and 15V (TC427 MOSFET driver) 2) A meaty 150V / 40A DC PSU that flows through the...
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    Controlling IGBTs via a microcontroller

    Thanks for your advice - I need 4 of these IGBTs to switch a 150V / 40A DC power source in a H-bridge formation - hence only 2 will ever be on. Effectively, I will switch 2 of them on for approx 20ms then off for 80ms, then switch the other 2 (ie reverse the output polarity) for 20ms then off...
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    Controlling IGBTs via a microcontroller

    Anyone have any suggestions how to drive an IGBT via a microcontroller? I'm trying to drive a STGE200NB60S with an Atmel AVR CPU. The AVR can run at both 3.3V and 5V and the gate threshold of the IGBT is 3V, so in theory I could just connect up an go. But, i cant help thinking that it can't be...
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    Current Limiting Technique

    I've trawled the data sheet but there's no mention of the internal resistance.
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    Switch selection for high-power H-bridge

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    Current Limiting Technique

    I'm expecting to connect the battery array to a simple circuit with a 45mH inductance and current limiting resistor. The connection will be made with a relay and then I'll expect the current to ramp linearly up to 40A in about 13ms, after which I want the resistor to stop the current rising...
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    Current Limiting Technique

    I am setting up a brief experiment that involves a switch an array on twelve 12V lead-acid batteries into a test inductor load at 150V with a limited 40A current. This test will only be conducted for about 10 seconds and I dont want to spend too much time/effort worrying about current limiting...
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    Switch selection for high-power H-bridge

    Thanks for your comments. I hadn't considered connecting the MOSFETs in parallel - cost is not a problem and I could put 10 in parallel if needbe (and it was physically possible to do so on a PCB). Are there any disadvantages to connecting MOSFETs in parallel and/or any caveats that you are...
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    Switch selection for high-power H-bridge

    Thanks for that. It's 150V DC, but a quick calculation I did showed 72W dissapation at 40A and I have to multiply that by 2 for normal H-bridge operation. I wondered if I couldn't use electromechanical relays to achieve the same thing. My time constraints are pretty tight (eg make the circuit...
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    Switch selection for high-power H-bridge

    I'm trying to design an H-bridge that can control the output polarity of an electromagenetic coil with inductance of around 50mH and very low resistance. The source voltage is around 150V at 40A and hence the design and the switch selection aren't trivial. The timing constraints make things...
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