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Registered Member #968
Joined: Fri Aug 24 2007, 04:54PM
Location: Norman, Oklahoma
Posts: 104
I am sure there is an easy solution to this one:
If I charge two capacitors in parallel to 348VDC from a full wave rectifier, what is a good way of disconnecting the positive terminals(The negative terminals may stay connected). This seems out of the range for a toggle switch.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
If you mean an isolation switch to connect the caps to the charger before and during charging, and to isolate them from the charger once charging has finished, then a toggle switch sounds fine. Any practical contact separation distance in air will withstand 384v when open, and almost any switch geometry heavy enough to support itself will carry any likely charging current.
However, if you are going to open the switch while charging to control the final voltage, then you'll need to check the breaking capacity. Also if the charger has significant output capacitance, and you want to close the switch to recharge when the charger is on, then there will be a large inrush current which could weld contacts.
What's supplying the AC to the full wave rectifier, a charger you can switch on and off?
Registered Member #968
Joined: Fri Aug 24 2007, 04:54PM
Location: Norman, Oklahoma
Posts: 104
The AC is being supplied by a Philmore 200W 110->220 transformer. edit: it does have a switch (and it seems to have considerable capacitance).
I need to charge two capacitors in parallel and then separate them (edit: from eachother) for use in a v-switch. One must maintain its charge while the other is discharging.
Not sure if your bank is a large one or a small one, but below is my take on a mechanical switch to isolate one of my capacitor banks from the charging circuit after charging. Might be overkill for what you require but maybe it could give you some ideas. I only use air for safety as its in the kV range, so there are no wires to give any chance of it getting back to me. Maybe a small solenoid would work for you at that voltage.
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Separating capacitor bank post-charge?
