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Dumb question re. simple inverter

Discussion in 'General Electronics Discussion' started by Dougster, Nov 8, 2014.

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  1. BobK


    Jan 5, 2010
    No, that is not a problem with my explanation.

    I said that it uses a high speed converter to convert to 170V DC, then inverts that to AC. This second step would obviously be at 60Hz. The difference is that this step does not require a transformer.

  2. Dougster


    Nov 8, 2014
    Thanks for the clarification. I guess I was confused because you said they could use a smaller transformer or induction coil because of the high frequency of the boost converter. I appreciate the feedback.
  3. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    Nov 28, 2011
    No, you have not understood Bob's explanation.

    The input voltage is first stepped up to about 170V DC using a converter operating around 50~100 kHz, then the 170V DC is used to power a circuit that's effectively just a high-voltage amplifier, just like an audio amplifier, which is supplied with the 60 Hz sinewave and generates the output voltage directly without requiring any transformer operating at 50 Hz.

    This solution is a lot smaller lighter than the old approach. The amplifier could be a Class D one for maximum efficiency, to reduce the heatsinking requirements as well. It could be made pretty light, quite compact and quite efficient.
  4. Dougster


    Nov 8, 2014
    Thanks for clearing that up guys. That explains a lot. Pretty clever design!
    KrisBlueNZ likes this.
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