Astec International Limited

A socket assembly for a fuse connector comprises a first bus bar, a fuse bus bar, and a fuse holder. The first bus bar comprises a contact blade extending toward a proximal end of the socket assembly and a fuse contact assembly. The fuse bus bar comprises a first fuse contact assembly and a distal end positioned adjacently to a distal end of the socket assembly. The fuse holder is removably engaged with the socket assembly and comprises an end wall at a distal end of the fuse holder. The end wall is configured to pass through the fuse contact assembly of the first bus bar and through the first fuse contact assembly of the fuse bus bar when removed from or inserted into the socket assembly.

A fuse holder comprises first and second body halves. The first body half includes a wall having a fuse cavity, a first channel extending from a first end of the fuse cavity of the first body half, and a second channel extending from a second end of the fuse cavity of the first body half. The second body half includes a wall having a fuse cavity, a third channel extending from a first end of the fuse cavity of the second body half, and a fourth channel extending from a second end of the fuse cavity of the second body half. The first channel and the third channel mate together and form a first fuse lead guide path, and the second channel and the fourth channel mate together and form a second fuse lead guide path.

A multi-phase interleaved PFC converter includes at least six switches coupled in a multi-phase interleaved circuit arrangement, and a control circuit. The control circuit is configured to turn on and turn off a first one of the switches according to a PWM signal to operate the first switch as an active switch having an off-time as a function of a duty cycle of the PWM signal, while turning on and turning off a second one of the switches as a synchronous switch. The control circuit is also configured to receive signal(s) indicative of currents in each phase of the interleaved circuit arrangement, set an on-time of the second switch equal to the off-time of the first switch when the signal(s) indicate continuous mode operation, and set the on-time of the second switch to a duration less than the off-time of the first switch when the signal(s) indicate discontinuous mode operation.

A transformer for a multi-phase power supply circuit includes a core body and a plurality of primary coil assemblies. The core body includes a first base portion having a plurality of core legs joined thereto and a second base portion having a plurality of core legs joined thereto. Each primary coil assembly of the plurality of primary coil assemblies includes a first primary winding having a respective core leg of the plurality of core legs of the first base portion extending therethrough and comprising a first node and a second node and includes a second primary winding having a respective core leg of the plurality of core legs of the second base portion extending therethrough and comprising a first node and a second node. The second nodes of the first primary windings are electrically coupled together, and the first nodes of the second primary windings are electrically coupled together.

A three-phase power supply circuit comprises three LLC resonant voltage converters and a transformer assembly comprising three primary coil assemblies and three secondary coil assemblies. Each primary coil assembly comprises a first primary winding having a first node electrically coupled with a respective first voltage output of the pair of voltage inputs of a respective LLC resonant voltage converter of the three LLC resonant voltage converters and a second node. Each primary coil assembly also comprises a second primary winding comprising a first node and a second node electrically coupled with a respective second voltage output of the pair of voltage inputs of the respective LLC resonant voltage converter. The second nodes of the first primary windings are electrically coupled together, and the first nodes of the second primary windings are electrically coupled together.