G - Physics – 05 – F
Patent
G - Physics
05
F
323/10
G05F 1/44 (2006.01) H02M 1/08 (2006.01) H02M 7/155 (2006.01) H03L 7/14 (2006.01)
Patent
CA 1180052
Attorneys Docket No. 6908 CAN INVENTORS: ANTON SCHWAGER and HANS-JORG SUTER INVENTION: CIRCUIT FOR GENERATING A SINUSOIDAL SYNCHRONISATION VOLTAGE FOR FIRING THYRISTORS ABSTRACT OF THE DISCLOSURE A synchronisation voltage is formed as the product of the output voltage of a phase-locked loop and the mean value of the magnitude of the network voltage. The synchronisation voltage is compared with the network voltage. A first control signal is formed when both voltages are the same. A reversing switch, in a first switching state, conducts the network voltage and, in a second switching state, conducts the synchronisation voltage to a reference frequency input of the phase-locked loop. A second control signal is formed when the phase-locked loop locks or latches with the thereto inputted reference frequency. The reversing switch is controlled by both control signals such that upon absence of the first control signal and the simultaneous presence of the second control signal there is attained the second switching state and otherwise the first switching state. The circuit can be beneficially used in a current regulation circuit of a drive for a powerful electric motor, with a power supply network operating at up to 400 Hz with a weak generator.
400211
Schwager Anton
Suter Hans-Jorg
Contraves Ag
Johnson & Hicks
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