CONTROL DEVICE FOR DIRECT-ACTION FREQUENCY CHANGER Russian patent published in 1994 - IPC

FIELD: electrical engineering. SUBSTANCE: cosine-wave timing unit is built around circular-field high-frequency transformer and transistor switches; main primary of circular-field high-frequency transformer is connected to one of supply phase leads; first lead of auxiliary primary winding is connected through capacitor to first lead of main primary winding and second leads of main and auxiliary primary windings are combined; main and auxiliary primary windings are developed in space through 90 deg.; three secondary transformer windings are connected in star, spaced 120 deg. apart, and connected through back-to-back parallel diodes to transistor switches; twelve other secondary windings of transformer are differentially interconnected in pairs and connected to control inputs of transistor switches; outputs of transistor switches are connected to one of inputs of comparators whose second inputs are connected to leading signal generator and comparator outputs are connected via pulse shapers to pulse distributor. EFFECT: improved design. 4 dwg