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Pyrus
Lv 6
Pyrus asked in Science & MathematicsEngineering · 11 months ago

What power transistors are there that support high voltage and adequate current?

I am looking for particular transistors that have especially high DC voltage handling capability. When I say "high", I mean, at least 350-400 V DC voltage (the application requires 320 V, so naturally, I don't want it to be barely on the level). The current rating is also important. If it can be 1 A each, then that would be great. 500 mA is also fine, because I can use them afterwards in parallel and use load balancing resistors. 

So, why am I asking this? First, because I have a few applications that could use such particular transistors, so it would be nice to know about them, and second, I want to try and drive a 5 HP 320V motor, a continuous DC servo motor to be exact. Of course, I know that there are dedicated circuits for this type of applications, but due to the specificity of this particular board, and where I live in as a country, they aren't just readily available. So, I wish to try and construct one on my own. Naturally, I know about the PCBs, soldering, etching solutions, etc., so those aren't a problem. 

Also note that I am intending to use the transistors stated in parallel to be able to increase the current throughput. Now, I noticed the BUL743 transistor, but the thing is that there is a power limitation. From the datasheet, it says that it can handle only about 256 W, but I could be wrong. So, any ideas about transistors, and any inputs on the project itself? Much appreciated :)

Update:

There is also one more thing that I wish to ask about the servo motor. I know about the PWM and what the Duty Cycle should be, but I AM wondering since it is receiving a control signal, should the voltage be equal to the power voltage? Or is that dependent on the controller on board of the servo (built-in)?

Update 2:

@Born Yesterday Did you mean an SSR or SCR? Although I know what an SSR is, I have to admit that it didn't cross my mind to use such a thing. Note, however, that I actually require to draw 320 Vdc from this relay, so it might not work. Also, concerning the servo, I noticed that it has 4 wires. I'll upload a picture or at least send a link if possible. It's the PMC5FB-00101, by the way. I should have mentioned that to begin with. 

2 Answers

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  • Dixon
    Lv 7
    11 months ago
    Favorite Answer

    Any number of high current high voltage MOSFETs, eg

    https://tinyurl.com/y8tn5ha4

  • 11 months ago

    Looks like your are very poor on basic electronic knowledge without knowing how to calculate power.

    A 5 HP motor consumes 3730 watts power !

    1A 400V transistor as you wish to get has maximum power equal to 400W, so how could it can be used to control a motor consumes 3730W !

    There are many FET in market able to handle over 1000V and as high as 10A or more, that is what you need !

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