electric_vehicle_lover Posted July 5, 2016 Share Posted July 5, 2016 https://github.com/EGG-electric-unicycle/documentation/wiki/How-to-MOD-MicroWorks-60V-to-12V-stepdown-converter How to MOD MicroWorks 60V to 12V stepdown converter This board is very useful because have as input 60V from the EUCs battery packs and can output 12V and max 2A (or other configurable voltage). I were able to configure the board to output 5V instead of the 12V. This way I could power a RGB LED strip and Arduino with the 5V. The original board have a resistor of 2.4k (R5 on the board) and I exchanged for another of 6.8k (as seen on the picture) - the output voltage will be 4.9 volts. Other voltages are possible if you use other resistor values. Link to product page on MicroWorks shop: http://wholesaler.alibaba.com/product-detail/converter-DC-60V-to-12V-output_60461417441.html Link to comment Share on other sites More sharing options...
Battling Posted July 5, 2016 Share Posted July 5, 2016 Good tips, thank you. It avoids the use of an LM7805 wich could emit some heat Link to comment Share on other sites More sharing options...
esaj Posted July 5, 2016 Share Posted July 5, 2016 7 minutes ago, Battling said: Good tips, thank you. It avoids the use of an LM7805 wich could emit some heat LM78xx's can't take much more than 35-40V as input, as far as I know. For linear regulation, you need some other regulator. TL783 is one option, input up to 125V, but it probably also heats up a lot, if you drop the voltage a lot and draw "enough" current. For example, dropping 67.2V to 12V and drawing 1 amp, the power wasted on the regulator is about: (67.2V - 12V) * 1A = 55.2W That's going to need one hell of a heatsink So not good except for very small currents (or smaller amount of voltage dropped). Link to comment Share on other sites More sharing options...
electric_vehicle_lover Posted July 5, 2016 Author Share Posted July 5, 2016 Maybe @Battling wanted to say add an extra linear regulator - I would do that if I had the 12V but now is simpler :-) Link to comment Share on other sites More sharing options...
Battling Posted July 5, 2016 Share Posted July 5, 2016 Yes, that's what I meant : EUC Battery (60V) --> MicroWorks stepdown converter (12V) --> LM7805 (5V). A dropout voltage of about 7V, It's not so much but we don't need any more heat in our EUCs. For now, I'm working with 3S battery because, initialy, I didn't want to connect auxiliary electronic on EUC battery, for safety reason. Link to comment Share on other sites More sharing options...
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