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  1. Simple and cheap DIY DC-DC converter for gate drive

    Technical Discussion
    I am working on an SCR gate drive board where I need a continuous DC current to two large SCRs connected anti-parallel for an AC switch on mains up to 480 or 560 VAC. That part of the design may not have much application for EVs, but it might be worth looking at the DC-DC converter I am...
  2. Isolated DC-DC boost converter design

    Technical Discussion
    Some of the principles I discussed in the "Magnetics" thread were in preparation for the design of the transformer I used for this DC-DC boost converter. For my purposes, I wanted to boost a 24V nominal battery to about 240 VDC to be used with a VFD for a three phase motor. I have built several...
  3. Magnetics - transformers, boost, buck - ferrite/iron

    Technical Discussion
    The concepts of magnetics and electromagnetism are fundamental to the understanding of motors, transformers, and buck or boost converters. I am trying to get a better handle on these concepts, and explain how such things work in a way that does not involve very much higher math. There are some...
  4. Charging Circuit Help

    Batteries and Charging
    Hi. I am building an electric scooter, which is powered by 4 6volt, 4.5amp rechargeable lead acid DC batteries (http://www.jaycar.com.au/productView.asp?ID=SB2496), wired in series to produce 24volts (18amps). I am planning to use an inbuilt charging circuit, which plugs into mains power (240v...
  5. I found an outstanding coil/transformer reference.

    Batteries and Charging
    This transformer/coil tutorial is the best that I've found on the net so far. Talks about the process of selecting cores and winding coils and transformers in plain language. With this I think I can finally start working on the magnetics I need for chargers, DC/DC converters, and other power...
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