G - Physics – 05 – F
Patent
G - Physics
05
F
323/10
G05F 1/44 (2006.01) G05F 1/455 (2006.01)
Patent
CA 1132657
ABSTRACT OF THE DISCLOSURE In a method and system of controlling the effec- tive value of alternating current supplied to a load through controlled semiconductor switching elements which are connected in parallel opposition, circuits are provided to produce data Image where K represents an increment of the load current, to an increment of the ignition angle .alpha. and I90 the effective value of the load current at an ignition angle of 90°. .DELTA..alpha. is calculated according to an equation Image where K is a constant smaller than 1. Then .DELTA..alpha. is added to an ignition angle .alpha.1 in a preceding half cycle to determine a new ignition angle which is used to control the controlled semiconductor switching elements. According to the invention, the control system can follow the change in the reference current at a high response speed and stability.
325987
Hyodo Kouichi
Mukai Kuniaki
Fetherstonhaugh & Co.
Tokyo Shibaura Denki Kabushiki Kaisha
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