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Load sharing mosfets - mosfet and pwm source fail modes
I am thinking of load sharing the TEC current with two mosfets, as well as single mosfet operation (one failed) and pwm source redundancy.
Two pwm sources are hard wired to the mosfet gates a primary and secondary. The secondary pwm source is shorted through a transistor. On failure of the primary pwm source, the secondary circuit is closed, kicking it into action.
Conceivably, in a nights imaging, loss of one or the other mosfet or the primary pwm source should ensure, uninterruped operation, replacing failed components in the hangar, instead of in the field.
It needs failure indications and I am not sure about the correct values for the (sense?) resistors. But it works in simulation.
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