I've not posted to this forum, so I'm not sure what to expect... here goes:
i have been searching for a circuit that will provide a method to trip off a 250A latching contact relay in the charging side of a 13 volt lithium battery pack. The pack is protected with charge control relays directed by a BMS (battery management system) , as well as charging voltage limits on the chargers (solar, alternator, AC rectified). The 250A contactor relay forms the fail safe component. The BMS pulls low (up to 175ma) when the absolute charge limit is reached on any individual cell is reached, I am using this signal to operate a small signal relay. The signal stays low (relay output high) until the over voltage situation is resolved. I would like to use this signal to generate a one shot pulse of sufficient current to operate the contactor coil, (approximately one amp), one second duration would be long enough. I will use a manual reset. I've looked at dozens of schematics and circuits, built a few, but I can't really find what I'm looking for. I know this is pretty basic stuff for most of the users of this forum and I'm trying to learn as I go. Any ideas would be appreciated Thanks for your help, chip
i have been searching for a circuit that will provide a method to trip off a 250A latching contact relay in the charging side of a 13 volt lithium battery pack. The pack is protected with charge control relays directed by a BMS (battery management system) , as well as charging voltage limits on the chargers (solar, alternator, AC rectified). The 250A contactor relay forms the fail safe component. The BMS pulls low (up to 175ma) when the absolute charge limit is reached on any individual cell is reached, I am using this signal to operate a small signal relay. The signal stays low (relay output high) until the over voltage situation is resolved. I would like to use this signal to generate a one shot pulse of sufficient current to operate the contactor coil, (approximately one amp), one second duration would be long enough. I will use a manual reset. I've looked at dozens of schematics and circuits, built a few, but I can't really find what I'm looking for. I know this is pretty basic stuff for most of the users of this forum and I'm trying to learn as I go. Any ideas would be appreciated Thanks for your help, chip