Document Type and Number:
Japanese Patent JPS5070852
Kind Code:
A
Abstract:
In an electric power delivery system, a plurality of controllable electric valves which are arranged in a bridge configuration are respectively fired in a predetermined sequence by a family of individual firing signals. At least three redundant frequency modulated oscillators and a distributor are used for cyclically generating the firing signals in timed relation to the alternating voltage of the power system. Each of the oscillators produces a train of discrete pulses at a frequency which normally is a predetermined harmonic of the system frequency, and the distributor includes voting logic means which enables a firing signal to be produced in the event of a coincidence of discrete pulses from any two of the oscillators. Concurrently with the commencement of each firing signal, all of the oscillators are simultaneously recycled. A special scheme is provided for starting the firing signal generator in step with system voltage so that the initial firing signal is associated with a predetermined one of the valves and is characterized by a known firing angle of desired value.
Application Number:
JP8665974A
Publication Date:
June 12, 1975
Filing Date:
July 30, 1974
Export Citation:
International Classes:
H02J1/00; G05F1/56; H02M1/084; H02M7/12; H02M7/155; H02M7/757; (IPC1-7): H02J1/00; H02M7/12; H02P13/16
Domestic Patent References:
| JPS4735723A | 1972-11-25 |