D-c power supply system fed from an a-c generator

Claim 2

D-C power supply system supplying a d-c network at a pair of load terminals, including a polyphase generator, a shunt field winding for the generator, output rectifiers to supply d-c output power at the load terminals, and an excitation rectification circuit including exciter rectifiers, to supply d-c power for the field winding, wherein the output rectifiers are connected in a half-wave rectification circuit to the generator windings and the load terminals, and further form a portion of the excitation rectification circuit and, together with the exciter rectifiers are connected in a full-wave rectification circuit to the generator shunt winding.

Claim 3

System according to claim 1, wherein the generator is a three-phase generator and the output windings of the generator are three-phase windings.

Claim 4

System according to claim 1, wherein the output windings of the generator are connected as six-phase windings.

Claim 5

System according to claim 3, wherein all six phases (32-37) of the generator windings are connected to the d-c network; and only three phases (33, 35, 37) are connected, one each, to a respective exciter rectifier (39, 41, 43) and to the field winding.

Claim 6

System according to claim 1, wherein the generator is star-connected, the star point being connected to one terminal of the d-c network, the free end terminal of the generator armature windings being connected to one terminal of the power rectifiers, the other terminal of the rectifiers being interconnected to form another terminal of the d-c network; and the free end terminals of the generator armature windings are further connected to the exciter rectifiers, the exciter rectifiers supplying d-c full-wave rectified excitation power for the field winding.

Claim 7

System according to claim 5, further comprising a voltage regulator inserted between the exciter field winding and the exciter rectifiers.

Claim 8

System according to claim 5, wherein the power rectifiers have their anodes connected to the negative terminal of the d-c network; the cathodes of the power rectifiers are connected to the free end terminals of the armature windings of the generator and to the anodes of the exciter rectifiers; the cathodes of the exciter rectifiers are interconnected; the voltage regulator is connected in circuit with the cathodes of the exciter rectifiers and the field winding; and the field winding circuit comprises: exciter rectifiers, voltage regulator, field winding, power rectifiers, to provide full-wave rectification of the exciter current for the field winding and voltage regulation of the output voltage.

Claim 9

System according to claim 1, wherein the exciter rectifiers are controlled rectifiers having their main power path (anode-cathode) connected in the field winding circuit; and a voltage regulator supplying firing pulsEs being connected to the gate circuit of the controlled rectifiers to trigger the controlled rectifiers.

Claim 10

System according to claim 1, wherein the power rectifiers are mounted as a complete assembly in a rectifier bank and the exciter rectifiers are mounted as a complete assembly in a second rectifier bank.