Build a SCR rectifier charger. This was my first charger for my EV back in 76. It's a full wave bridge with two SCR's and two power diodes. The AC power of either 120 or 240 voltage feed directly to the SCR's and output out of the diodes directly to the battery pack.
Use a fuse on the input AC lines and a AC contactor to turn on the AC power to the rectifier. The trigger circuit voltage was tap off the Line I and Line II of the AC main input voltage of either 120 or 240 vac. My SCR's was rated at 100 amp with the trigger circuit rated at 10 volts. To drop the the input AC line voltage to the trigger circuit, there was a voltage divider made out of 20 watt power resistors with a heat sinking base. This voltage divider went across the two AC input lines with a 10 amp slow blue fuse. A 20 watt power resistor of 50 ohms is tap off the main of one AC input line, is connected in series with a 20 watt power resistor of 150 ohms that is connected to the other AC input line. A 20 watt power variable resistor of 150 ohms is tap off between the circuit line between the two 20 watt power resistors that are in series between the two AC input lines. Then the 20 watt variable 150 ohm resistor is connected to the gate of the SCR. These are a dial type rotating resistor with a control knob on it. Before turning on the power to this type of device, make sure that the variable 150 ohm resistor is turn down all the way or is at 150 ohms. At 150 ohms the charging current will be low and at 0 ohms will be high. The above ratings are for a 100 amp charger that will vary from 5 amps to 100 amp. To drop the charger ampere to less than 5 amps, the variable resistor to the gate will have to be increase above 150 ohms. In designing this circuit, I first test out the voltage out puts either by using fix resistors on a test board, or use a electronic cad program which they are several on line. You can see example of these circuits on line - SCR Rectifier Circuits. Roland ----- Original Message ----- From: Peakfoto Digital Photo Still n Video<mailto:[email protected]> To: [email protected]<mailto:[email protected]> Sent: Sunday, September 29, 2013 12:08 PM Subject: [EVDL] slow cell balancing, charger curent limiting I been use different light bulbs in serious with my charger to limit the current to the pack for slow equalizing . I have the ev power cell regulators and mini bms . could a fairly simple circut be used that some kind of varible reistance/ load so I could turn my amps from variably 6.0 to 1.0 amps. m my scooter use 22 calbs for like 80 volts ?? while chargring . balacing and battery baby sittiing is a pain. maybe a power transitor with a pot ??? _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub<http://www.evdl.org/help/index.html#usub> http://lists.evdl.org/listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA<http://groups.yahoo.com/group/NEDRA>) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20130929/831dbdfa/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)
