Productive solid state dpdt relay for High-Risk Applications
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sans nom asked solid state DPDT switch?
i need a non-mechanical DPDT switch which doesn't necessarily have to be in a single packaging (could be a circuit of 2-3 components, very few)?? FETs???. it's important that it operates fast and draws little power. if i need a tie breaker as to which one to choose, i'd say i'm going for whatever's smallest and cheapest. i don't want to switch it by hand... already have a separate latching push button and latching relay as interface... but that's another story. the problem is: i want a DPDT that is solid state and triggered by a current. sort of like a thyristor that's got 2 poles and 2 throws. @commins: no, i DON'T NEED a physical switch for interfacing. asi i said, i've ALREADY got that one covered. i need to just apply a small current and then IT will REDIRECT the current from the source to another pole/terminal. @steve: i'm switching power at around 5-12V. i need it fast, like several magnitudes greater than 5ms (that's the max rated time that the device i'm shunting). so come to think of it, most solid state components would do. using multiplexers have never crossed my mind. it's a possible solution, though i'm leaning towards a solution that's tiny and cheap. forgot to mention: no it's not for building a switching power supply or driving DC motors, etc.
And got the following answer:
What kind of power/voltage range are you looking for? Are you switching power or signals? How fast is fast? If it switches really fast, then you'll pick up switch bounce from a relay. There are dual 2channels (multi)plexors chips that would work for low currents. Single input controls if the inputs are connected "straight through" or "crossed."- Just like a pair of DPDT switches ganged together- but there's little reason why you have to use both pairs of solid state switches. If you've switching power on the poles, a pair of half-bridges controlled by the signal and it's complement should work. FETs are controlled by applied voltage, and with the more usual n-channel [voltage applied to close) the control voltage needs to be higher than the output voltage. Bipolar transistors controlled by current.
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