Patent ID: 7049921

Claim:
A transformer comprising: at least three input terminals arranged for electrical connection to a three phase power source; at least six output terminals arranged for electrical connection to an external multiple phase load; and a first coil, a second coil and a third coil each containing at least a first winding, a second winding and a third winding, each winding being isolated relative to each other and having a first end and a second end, wherein: each of said third windings is tapped at corresponding points; the first ends of the first windings are electrically connected together to form an electrical neutral; said second winding of said first coil is electrically connected to the tap of said third winding of said second coil; said second winding of said second coil is electrically connected to the tap of said third winding of said third coil; and said second winding of said third coil is electrically connected to the tap of said third winding of said first coil; the second end of said first winding of said first coil is electrically connected to said second end of said second winding of said second coil; the second end of said first winding of said second coil is electrically connected to said second end of said second winding of said third coil; the second end of said first winding of said third coil is electrically connected to said second end of said second winding of said first coil; each of the three first ends of said third windings is connected to a separate one of said at least six output terminals; and each of the three second ends of said third windings is connected to a separate one of the remaining output terminals.