H - Electricity – 02 – M
Patent
H - Electricity
02
M
323/10
H02M 5/04 (2006.01) G05F 1/455 (2006.01) H02P 13/12 (2006.01)
Patent
CA 1083217
ABSTRACT OF THE DISCLOSURE A control circuit for an a-c control element consisting of controlled rectifier elements in conjunction with a transformer in which a separate current transformer is provided for each of the transformer windings and all current transformers of the same respective phase have their second- aries connected together in a bucking circuit, to which a measuring arrange- ment is connected which measures the peak value of the difference value formed during each half-wave, and the output signal of which is introduced, depending on the polarity of the difference value, into the control circuit of the one or the other branch of the a-c control element.
282938
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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