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Old 02-06-2011, 08:05 AM   #10 (permalink)
redbird300
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Join Date: Mar 2009
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Here's the diagram of the second (and final) version, with two changes:

1) A lower resistor value with higher power rating. This would make for around 170-180 Watts of discharging power, still working on appropriate cooling for that, but it should not be a big problem.

2) We use a relay with a double row of contacts now, instead of one with a single contact. This will make for no repeated on/off switching of the device anymore at the end of the discharge cycle. When we hook up a full pack, nothing will happen now, as the contact "B" is still open. Push the "start discharge" button for a brief moment, and the relay coil will get the necessary current to close the contacts A and B. When releasing the push button, the relay will stay active, as the contact B is closed now, and it will stay that way. At the end of the discharge, the alarm port will cut off the relay coil, and even when the alarm port activates again, it won't be able to reactivate the relay, as contact B is open again. Done.

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