Controller for a semiconductor switch that includes an inductive coupling for communication across galvanic isolation

A controller to control a power switch of a power converter, the controller comprising:

• a drive circuit configured to sense an operational parameter of the power switch, having a first reference potential;
• a driver interface having a second reference potential;
• and
• an inductive coupling comprising,
• a primary winding having a first primary terminal and a second primary terminal connected to the driver interface, wherein a signal on the first primary terminal is compared to a first threshold and a signal on the second primary terminal is compared to a second threshold, and
• a secondary winding having a first secondary terminal and a second secondary terminal connected to the drive circuit;
• wherein the driver interface is configured to compare at least a portion of the signal at one of the first and the second primary terminals with its respective threshold, and
• wherein the drive circuit is configured to drive current in a first direction in the secondary winding to transmit a first signal in response to the operational parameter.