H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/89
H02M 7/155 (2006.01) H02M 3/156 (2006.01)
Patent
CA 1284520
ABSTRACT OF THE DISCLOSURE The invention is a locally isolated regulated power supply providing a regulated dc power output from an ac current source having a large dynamic range. The power supply comprises an ac-to-dc converter for providing a rectified dc output from an ac current input. The converter includes a current transformer in combination with a rectifier. The current transformer has a saturable magnetic core for receiv- ing primary and secondary windings. The current transformer produces a reduced secondary output voltage that is a function of the ac system current characterized by the decreased coupl- ing between the core and secondary winding as the core approach- es saturation during substantial increases in the ac system current. One or more secondary windings and associated circuit- ry can be provided. In addition, an electronically controlled switch or shunt having as inputs a predetermined reference volt- age and the dc output voltage of the rectifier or a signal equivalent thereto is connected across the converter. The switch provides for the continual shunting of the converter whenever the dc output voltage is equal to or greater than the predetermined reference voltage. A voltage support capacitor is connected across the output of the converter for maintaining the output voltage proportional to the selected reference volt- age. An isolation diode is used to isolate the voltage support capacitor from the converter during those periods of time when the converter is being shunted by the electronically controlled switch. This prevents the discharge of the capacitor.
528966
Rodgers Eugene Lanier
Stacey Eric John
Riches Mckenzie & Herbert Llp
Westinghouse Electric Corporation
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