An optically powered drive circuit and a method for controlling a first
semiconductor switch are provided. The optically powered drive circuit
includes a photovoltaic cell configured to receive a first light signal
from a fiber optic cable and to output a first voltage in response to the
first light signal. The optically powered drive circuit further includes
an energy storage device electrically coupled to the photovoltaic cell
configured to store electrical energy received from the first voltage and
to output a second voltage. The optically powered drive circuit further
includes an electrical circuit electrically coupled to both the
photovoltaic cell and the energy storage device. The electrical circuit
is energized by the second voltage. The electrical circuit is configured
to receive the first voltage and to output a third voltage in response to
the first voltage for controlling operation of the first semiconductor
switch.