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HelsinkiHacklab / cambot

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Design a fail-safe circuit #1

Open rambo opened 13 years ago

rambo commented 13 years ago

It should take in for example ~100ms 5V pulse from the uC every ~500ms and if the input is either low or high for more than ~500ms it should disconnect the main battery via SSR.

Naturally the battery must be disconnected by default but idea was easier to explain in the above fashion.

rambo commented 13 years ago

It actually might be neccesary to use a MOSFET to drive traditional relay since it seems power-SSR:s are from 12V upwards...

rambo commented 13 years ago

first version of the circuit in the hardware directory.

rambo commented 13 years ago

If driving traditional relay we probably need to use something like TPS5410 to get power for driving it (need to work on very wide input range due to the regenerative braking causing voltage spikes [even with the 5410 we probably should add a 33V zener just in case])