Galvanically isolated auxiliary led for performing input operations

A system, comprising:

• a first power domain in which a first emitter is disposed such that the first emitter is capable of producing a first signal indicative of a first electrical signal in the first power domain;
• a third power domain in which a second emitter is disposed such that the second emitter is capable of producing a second signal indicative of a second electrical signal in the third power domain;
• and
• a second power domain in which a detector is disposed, wherein the second power domain is electrically isolated from both the first power domain and the third power domain, wherein the detector is configured to receive the first signal as well as the second signal and produce an output in response thereto that represents a combination of the first signal and the second signal, and wherein the output of the detector is used in connection with controlling a load that is also operating in the second power domain.

A method of operating a control system across a plurality of power domains that are electrically isolated from one another, the method comprising:

• producing a first control signal based on a first electrical signal in a first power domain;
• producing a second control signal based on a second electrical signal in a third power domain;
• receiving both the first control signal and the second control signal with a detector operating in a second power domain that is electrically isolated from both the first power domain and the third power domain;
• based on a combination of the first control signal and the second control signal, producing an output with the detector;
• and
• providing the output of the detector to a load controller that is also operating in the second power domain, wherein the output of the detector is used by the load controller to control a load in accordance with the first control signal during normal operation of the first power domain, and wherein the output of the detector is used by the load controller to control the load in accordance with the second control signal during a power interruption event in the first power domain.