Power supply start-up circuit for a trip unit and circuit...

Details Power supply start-up circuit for a trip unit and circuit... Power supply start-up circuit for a trip unit and circuit...

H - Electricity

02

H

H02H 3/02 (2006.01) H01H 71/10 (2006.01) H01H 71/12 (2006.01) H01H 73/02 (2006.01) H02H 3/08 (2006.01)

Patent

CA 2598890

A trip unit power supply includes a current transformer having a primary and a secondary. A full-wave rectifier is structured to rectify the voltage from the secondary and includes an input electrically interconnected with the secondary and an output including a rectified voltage. A field effect transistor is electrically connected in series with a burden resistance. A switching regulator includes an input, a shutdown mode and an output structured to power the trip unit. A startup circuit is powered from the rectified voltage and cooperates with the FET. The startup circuit burdens the secondary through the series combination of the FET and the burden resistor and causes the switching regulator to enter the shutdown mode. The startup circuit removes the burden, exits the shutdown mode and powers the trip unit from the output of the switching regulator when the rectified voltage reaches a predetermined value.

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