Abstract: A method of monitoring the temperature of a solid state switch in an aircraft solid state power controller. The method includes: measuring an electric current (I) flowing through the solid state switch; calculating, based on the measured electric current (I), an introduced electric power (Pel) that is introduced into the solid state switch within the predefined time period (?t); calculating an increase in temperature (?T) of the solid state switch that is caused by the introduced electric power (Pel); calculating an actual temperature (Tact) of the solid state switch by adding the calculated increase in temperature (?T) to an ambient temperature (Tamb); and comparing the calculated actual temperature (Tact) with a predefined temperature threshold (Tth) and determining an overheat condition if the calculated actual temperature (Tact) exceeds the predefined temperature threshold (Tth).

Abstract: A power supply system for use with a component comprises at least three phases of power supply, with each of said three phases passing through a solid state power controller having an on/off switch. Each of the phases of power pass through a current sense transformer. A ground fault circuit receives an outlet from the current sense transformer. The ground fault circuit includes an analog filter connected into a digital processor. An output of the digital processor is operable to control the switches on the solid state power controllers. The three phases distribute power to the component when the switch on their associated solid state power converter is on.

Abstract: A power supply system for use with a component comprises at least three phases of power supply, with each of said three phases passing through a solid state power controller having an on/off switch. Each of the phases of power pass through a current sense transformer. A ground fault circuit receives an outlet from the current sense transformer. The ground fault circuit includes an analog filter connected into a digital processor. An output of the digital processor is operable to control the switches on the solid state power controllers. The three phases distribute power to the component when the switch on their associated solid state power converter is on.