Triple module redundant solid state power switch

A majority-vote, single fault tolerant power switch comprising:

• a first branch including a first transistor and a second transistor in series with the first transistor;
• a second branch in parallel with the first branch and including a third transistor and a fourth transistor in series with the third transistor;
• an output of a first OR-circuit applied to the gate of the first transistor;
• an output of a second OR-circuit applied to the gate of the third transistor;
• a first switch control node applied to a first input of the first OR-circuit and to the gate of the fourth transistor;
• a second switch control node applied to a second input of the first OR-circuit and to a first input of the second OR-circuit;
• and
• a third switch control node applied to a second input of the second OR-circuit and to the gate of the second transistor,
• wherein the power switch is in an on-state if at least any two of the first, second, and third switch control nodes are in an on-state.

A single fault tolerant power switch operated by a majority-vote of three switch controllers, the single fault tolerant power switch comprising:

• a first switch controller and a second switch controller in an OR-configuration configured to control a first transistor in a first circuit branch;
• a third switch controller configured to control a second transistor in the first circuit branch;
• the second switch controller and the third switch controller in an OR-configuration configured to control a first transistor in a second circuit branch that is in parallel to the first circuit branch;
• and
• the first switch controller configured to control a second transistor in the second circuit branch,
• wherein the single fault tolerant power switch is in an on-state if at least any two of the first, second, and third switch controllers are in an on-state.