Patent ID: 8004863

Claim:
A circuit device comprising: a network interface responsive to a powered network to receive a power supply and data; an electrical isolation barrier adapted to define a non-isolated power domain and an isolated power domain; a first control circuit associated with the non-isolated power domain, the first control circuit coupled to a primary winding of a transformer and adapted to control current flow via the primary winding; and a second control circuit associated with the isolated power domain, the second control circuit coupled to a secondary winding of the transformer, the second control circuit adapted to detect a power error associated with the secondary winding and to transfer a digital command across the electrical isolation barrier to the first control circuit to adjust a current at the primary winding in response to detecting the power error; the digital command comprising: a first reference signal; a second reference signal that is an inverted version of the first reference signal; a first power adjustment signal encoded using the reference signal; and a second power adjustment signal that is an inverted version of the first power adjustment signal.