H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/94
H02M 7/155 (2006.01) G01R 19/22 (2006.01) H02M 7/162 (2006.01)
Patent
CA 1214825
14 ABSTRACT OF THE DISCLOSURE A current sensor for sensing the total DC cur- rent flowing in the DC rails of a multiphase converter circuit. The current sensor comprises two current trans- formers coupled to the AC power lines of the converter and another current transformer coupled to the circuit path of a freewheeling diode connected across the DC rails of the converter. An indication of the total DC current flowing through the converter is obtained by summing an indication of current flowing in the AC power lines of the converter and the instantaneous pulsed DC current flowing in the DC path of the converter during periods of non-conduction of the switching SCR's in the converter. The combination of the two currents are summed by a summing resistor thereby to generate a voltage signal proportional to the instan- taneous level of the total DC current flowing through the converter.
452984
Edwards Charles W.
Johnson Frederick O.
Oldham And Company
Westinghouse Electric Corporation
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