Transformer/rectifier for aircraft ground power unit

An aircraft ground power unit for providing DC power for aircraft, comprising:

• a transformer/rectifier arrangement, including:
• an A-phase transformer formed by an A-phase magnetic member, an A-phase primary winding having first and second sides, and an A-phase secondary winding;
• a B-phase transformer formed by a B-phase magnetic member, a B-phase primary winding having first and second sides, and a B-phase secondary winding;
• a C-phase transformer formed by a C-phase magnetic member, a C-phase primary winding having first and second sides, and a C-phase secondary winding;
• wherein the A-phase primary winding first side is connected to receive A-phase power, wherein the B-phase primary winding first side is connected to receive B-phase power, wherein the C-phase primary winding first side is connected to receive C-phase power;
• wherein the A-phase primary winding second side, B-phase primary winding second side and C-phase primary winding second side are connected together for delivering current traveling out of one of said second sides into at least one of said other second sides;
• wherein the A-phase, B-phase, and C-phase secondary windings are arranged in a full wave center-tap transformer output connection which includes an output for delivering current to a load when connected thereto.

An aircraft ground power unit for selectively providing ac and dc power to an aircraft, comprising:

• a source of 3-phase power including A, B and C phases;
• a transformer/rectifier arrangement for converting 3-phase ac power to dc power, including:
• an A-phase transformer formed by an A-phase magnetic member, an A-phase primary winding having first and second sides, and an A-phase secondary winding;
• a B-phase transformer formed by a B-phase magnetic member, a B-phase primary winding having first and second sides, and a B-phase secondary winding;
• a C-phase transformer formed by a C-phase magnetic member, a C-phase primary winding having first and second sides, and a C-phase secondary winding;
• wherein the A-phase primary winding second side, B-phase primary winding second side and C-phase primary winding second side are connected together for delivering current traveling out of one of said second sides into at least one of said other second sides;
• a set of dc outputs for delivering dc power to the aircraft;
• a set of 3-phase outputs for delivering 3-phase ac power to the aircraft;
• at least one contacter connected between the 3-phase source and the transformer/rectifier arrangement for selectively connecting the transformer/rectifier arrangement to the source of 3-phase power such that when so connected the A-phase primary winding first side is connected to receive A-phase power, the B-phase primary winding first side is connected to receive B-phase power, and the C-phase primary winding first side is connected to receive C-phase power;
• and
• at least one contacter connected between the source of 3-phase power and the set of 3-phase outputs for selectively controlling delivery of 3-phase ac power thereto.

An aircraft ground power unit for selectively providing ac and dc power to an aircraft, comprising:

• a source of 3-phase power;
• a transformer/rectifier arrangement, including:
• an A-phase transformer formed by an A-phase magnetic member, an A-phase primary winding, and an A-phase secondary winding;
• a B-phase transformer formed by a B-phase magnetic member, a B-phase primary winding, and a B-phase secondary winding;
• a C-phase transformer formed by a C-phase magnetic member, a C-phase primary winding, and a C-phase secondary winding;
• wherein the A-phase primary winding, B-phase primary winding, and C-phase primary winding are connected in a neutral free STAR (Y) configuration;
• and
• wherein the A-phase, B-phase, and C-phase secondary windings are arranged in a full wave center-tap transformer output connection which includes an output for delivering current to a load when connected thereto;
• a set of dc outputs for delivering de power to the aircraft;
• a set of 3-phase outputs for delivering 3-phase ac power to the aircraft;
• at least one switching circuit for controlling delivery of 3-phase power from the source of 3-phase power to the transformer/rectifier arrangement and the set of 3-phase outputs.