G - Physics – 05 – F
Patent
G - Physics
05
F
323/20
G05F 1/70 (2006.01) H02J 3/16 (2006.01) H02J 3/18 (2006.01)
Patent
CA 1229380
16 ABSTRACT OF THE DISCLOSURE A device is taught for controlling the residual charge on a thyristor switched capacitor. A capacitor is in series circuit relationship with at least two pairs of back-to-back thyristor switches which is then connected across an AC network. Each back-to-back thyristor combi- nation is shunted by a non-linear clamping device which exhibits a very high resistance below a specified voltage level and a very low resistance above that voltage level. A pulse stretcher and a sequential firing circuit ar- rangement is utilized so as to prolong the conduction of one of the back to-back pair of thyristor switches at a time. During an overvoltage condition in the AC network the non-linear clamping device will limit the residual charge on the capacitor. A plurality of capacitor, thy- ristor switch, non-linear clamping device combinations may be utilized in parallel with the AC network.
427781
Oldham And Company
Westinghouse Electric Corporation
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