Although there exist bi-directional converters (later model Prius has it to convert the 200V battery to 500V for the inverter and when the inverter generates power from regen braking, then the converter puts it back into the battery) but almost all converters are single-direction. The typical 120V to 12V converter has a switching circuit that drives a transformer that converts the 120V power down to 12V and a diode to rectify it to 12V DC output. So, typically when you apply 12V to the output, nothing happens and no power will come out the 120V input. Otherwise, a battery charger would be a dangerous thing when you unplug it with the battery attached, but that is not how it works - the output rectifier makes sure that everything that has left the charger will not re-enter it and if it does re-enter (if the diode fails for example) then it will not be able to cross the transformer, because you need AC to deliver power through a transformer and the output is 12V DC. It may be able to flow into the transformer and blow a fuse, but nothing will come out the 120V input of the converter.
There are DC/DC converters that up-convert voltage, which is what you are trying to do here. They are generally of the "boost" architecture. Success. Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.info Skype: cor_van_de_water Tel: +1 408 383 7626 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Peter Eckhoff Sent: Monday, April 28, 2014 5:25 PM To: Electric Vehicle Discussion List Subject: [EVDL] Converter Direction of flow The converters that I see for EV applications have the output voltage at 12 volts. What happens if you apply 12 volts to the output side, will that produce 120 to 140 volts on the input side? or do you need a converter specifically designed to go the other way? The idea is to take a 12 volt (or 24 volt) battery with high amphrs and use the electronics to produce 120 volts at a tenth of the battery's rated amphrs to run a 120 volt DC motor using lithium based batteries. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140428/6fac 4950/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
