Patent ID: 8335094

Claim:
A power frequency converter for an electronic device mounted in an aircraft in which a three-phase AC power source is supplied from an aircraft fuselage and is converted by a rectifier and a smoothing capacitor to DC power and the power is subsequently converted by a PWM switch element to have a commercial single-phase power frequency of a load device to thereby supply the power to the load device, the power frequency converter comprising: a current control circuit having an active element that is connected between the rectifier of the DC power and the smoothing capacitor and that controls a variation in rectified current flowing from the rectifier to the smoothing capacitor, when a variation in the rectified current is caused due to a variation in the instantaneous power consumption of the load device, the current control circuit limits the rectified current to have a value equal to or lower than a predetermined reference current value during an increase of the rectified current to suppress a charging voltage to the smoothing capacitor and increases the rectified current to have a value close to the reference current value during a decrease of the rectified current to thereby suppress the rectified current to a substantially fixed value to thereby mitigate an influence on a primary power source by the variation in the instantaneous power consumption of the load device, wherein when the current is limited to have a value equal to or lower than the predetermined reference current value during an increase of the rectified current of the current control circuit, the reference current value is compensated so that, when the current control circuit has an average operation voltage higher than a reference value, then the reference current value is increased and, when the current control circuit has an average operation voltage lower than the reference value on the contrary, then the reference current value is decreased to thereby allow the power frequency converter to operate so as to correspond to the average power consumption of the load device and a change in the voltage value of the supply power so that the current control circuit automatically moves to a stable operating point to thereby mitigate an influence on the primary power source by the variation in the instantaneous power consumption of the load device.