Abstract: A protection circuit for a parallel power system having at least two parallel coupled voltage regulators is disclosed. The protection circuit includes at least two isolation control circuits, each control circuit being coupled to a respective voltage regulator. Each isolation control circuit includes a current sense circuit for sensing current polarity at an output of the respective voltage regulator, and a controller for automatically isolating the respective voltage regulator when an over-voltage condition exists at an output of the parallel power system and a positive current polarity is sensed at the output of the respective voltage regulator. The at least two isolation control circuits isolate only a voltage regulator having positive current outflow during the over-voltage condition. In one embodiment, each isolation control circuit further includes an over-voltage detection circuit for detecting when the over-voltage condition exists at the output of the parallel power system.

Abstract: A connector for a voltage regulator module (VRM) that provides for a parallel coupling to a printed wiring board (PWB) without surface mounting of the VRM includes a plurality of conductive power blades mounted within slots of insulators. The VRM connector is coupled to PWB and VRM and provides for spacing between the VRM and the PWB. The VRM connector provides for high current flow and reduced circuit heating.

Abstract: A protection circuit for a parallel power system having at least two parallel coupled voltage regulators is disclosed. The protection circuit includes at least two isolation control circuits, each control circuit being coupled to a respective voltage regulator. Each isolation control circuit includes a current sense circuit for sensing current polarity at an output of the respective voltage regulator, and a controller for automatically isolating the respective voltage regulator when an over-voltage condition exists at an output of the parallel power system and a positive current polarity is sensed at the output of the respective voltage regulator. The at least two isolation control circuits isolate only a voltage regulator having positive current outflow during the over-voltage condition. In one embodiment, each isolation control circuit further includes an over-voltage detection circuit for detecting when the over-voltage condition exists at the output of the parallel power system.

Abstract: An over-voltage protection circuit for power supplies employing phase-shift controllers is provided. The power supplies typically comprise a redundant system for maintaining availability of bus voltage in the event of the failure of one of the supplies. The circuitry provides advantages in high power applications over prior art by overcoming the inefficiencies of connecting the supplies to a common bus through a diode. Additional circuitry eliminates the false shutdown of working power supplies.