Active bridge rectifier

An electronic device comprising:

• a monolithic GaN-based semiconductor substrate comprising:
• a first semiconductor switch having a first pair of terminals arranged to be electrically coupled in parallel with a first external diode;
• a second semiconductor switch having a second pair of terminals arranged to be electrically coupled in parallel with a second external diode;
• and
• a switch control circuit coupled to at least one terminal of the first pair of terminals and coupled to at least one terminal of the second pair of terminals, the switch control circuit arranged to selectively operate the first and second semiconductor switches using power from the at least one terminal of the first pair of terminals and the at least one terminal of the second pair of terminals.

A rectifier circuit, comprising:

• first and second input nodes configured to collectively receive an AC voltage;
• a ground node;
• an output node;
• first, second, third, and fourth conductive elements configured to provide a rectified voltage difference across the output node and the ground node based on the AC voltage input;
• and
• a switch control circuit configured to generate a plurality of switch signals, wherein the switch control circuit comprises first and second power inputs respectively connected to the first and second input nodes, and wherein the AC voltage across the first and second input nodes causes the switch control circuit to generate the switch signals,
• wherein the first conductive element comprises a first switch, configured to selectively conduct in response to a first switch signal from the switch control circuit, and
• wherein the second conductive element comprises a second switch, configured to selectively conduct in response to a second switch signal from the switch control circuit.

A switch circuit, comprising:

• a semiconductor substrate, comprising GaN;
• first and second input nodes formed on the substrate;
• a switch control circuit formed on the substrate, wherein the switch control circuit comprises first and second power inputs respectively connected to the first and second input nodes, and wherein the switch control circuit is configured to generate a plurality of switch signals in response to an AC voltage across the first and second input nodes;
• and
• a first switch formed on the substrate, wherein the first switch is connected to the first input node, and wherein the first switch is configured to selectively conduct in response to a first switch signal from the switch control circuit.