Railways – Droppings catcher
Patent
1976-01-13
1977-06-14
Shoop, William M.
Railways
Droppings catcher
104148R, 318227, 318345G, 318416, 318506, H02M 700
Patent
active
040300188
ABSTRACT:
A power converter system for converting an AC voltage into a DC voltage, comprising a transformer means provided with a primary winding connected to an AC power source and a secondary winding divided into a plurality of sets of coils; and rectifier means including a plurality of rectifier circuits, each of said rectifier circuits including controlled rectifier elements and having AC and DC terminals, said AC terminals of each rectifier circuit being connected to the corresponding one of the sets of secondary coils, said DC terminals of said respective rectifier circuits being connected in series to produce a DC output voltage from said rectifier means, a predetermined one of said rectifier circuits being adapted to control its DC output voltage sequentially and cyclically in a plurality of steps of generating the DC output voltage from said rectifier means, the remaining rectifier circuits being adapted to control their DC output voltages in an on-off fashion in said steps, said steps being switched over by on-off controlling said remaining rectifier circuits for on-off control when the DC voltage of said predetermined one of said rectifier circuits reaches an ultimate value in each cycle; the improvement wherein a voltage control range of the predetermined one of the rectifier circuits for sequential control is selected to overlap voltage control ranges of the remaining rectifier circuits for on-off control.
REFERENCES:
patent: 3257597 (1966-06-01), Weiser
Hitachi , Ltd.
Shoop William M.
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