CONVERTER OF AC VOLTAGE TO DC WITH 18-FOLD FREQUENCY OF PULSATION Russian patent published in 2008 - IPC H02M7/10 

FIELD: electrical engineering.

SUBSTANCE: converter of AC voltage to DC with 18-fold frequency of pulsation may find application for supply to DC loads. Converter contains three-phase transformer (1) with three identical groups of secondary windings, which are connected in every group as star and reverse star and united with zero points O, O' and O'' into six-phase stars and thirty valves (2...31). Numbers of turns in corresponding cophased parts of six-phase stars windings are equal, and ratio of stars windings turns numbers to numbers of reverse stars windings turns makes From twelve valves of device two six-valve rings are formed, one from valves (6, 11, 16, 21, 26, 30), the other from valves (7, 12, 17, 22, 27, 31). Valves in every rings are connected serially with cathodes that form ring outputs, and anodes that form ring inputs. Two reverse three-valve stars are formed from six valves, anode one form valves (2, 15, 25) and cathode one from valves (5, 10, 20). Common points of three-valve stars form output terminals of device (32) and (33), to which load (34) is connected. Outputs of windings of the first group of windings are connected to the inputs of the first six-valve ring, outputs of which are connected to outputs of windings of star of the second windings group, which are also connected to inputs of the second six-valve ring, outputs of which are connected to outputs of windings of star of the third windings group. Every input of six-valve rings, which is connected to the output of star winding installed on one of the transformer rods, is connected by pair of valves that form this input, with outputs of windings of the other neighboring star, which are installed in two other transformer rods. Outputs of windings of star in the first group of windings a, b, c are connected by valves (3, 13, 23) with outputs x', y', z' of reverse star winding in the second group of windings and with cathodes of valves (15, 25, 32) of the first three-valve star. Outputs x, y, z of reverse star windings in the first group of windings are connected by valves (18, 28, 8) with outputs a', b', c' of star windings in the second group of windings, every of which is accordingly connected by valves (4, 14, 24) with outputs x", y", z" of reverse star windings in the third group of windings. Every output x', y', z' of reverse star winding in the second group of windings is connected by valves (19, 29, 9) with outlets a", b", c" of star winding in the third group of windings and to cathodes of valves (5, 10, 20) of the second three-valve star. All converter valves are connected unidirectionally.

EFFECT: higher quality of electric energy conversion.

3 dwg