초록 ▼

A unity power factor converter capable of effecting either inversion (dc-to-dc) or rectification (ac-to-dc), and capable of providing bilateral power control from a DC source (or load) through an AC transmission line to a DC load (or source) for power flow in either direction, is comprised of compar

A unity power factor converter capable of effecting either inversion (dc-to-dc) or rectification (ac-to-dc), and capable of providing bilateral power control from a DC source (or load) through an AC transmission line to a DC load (or source) for power flow in either direction, is comprised of comparators for comparing the AC current i with an AC signal iref (or its phase inversion) derived from the AC ports to generate control signals to operate a switch control circuit for high speed switching to shape the AC current waveform to a sine waveform, and synchronize it in phase and frequency with the AC voltage at the AC ports, by selectively switching the connections to a series inductor as required to increase or decrease the current i.

대표청구항 ▼

A unity power factor conversion circuit, capable of effecting either dc-to-ac or ac-to-dc conversion, and capable of providing bilateral power control from a DC source, or load, at DC ports to an AC load, or source, at AC ports using a storage capacitor and a full wave rectifier to store energy in s

A unity power factor conversion circuit, capable of effecting either dc-to-ac or ac-to-dc conversion, and capable of providing bilateral power control from a DC source, or load, at DC ports to an AC load, or source, at AC ports using a storage capacitor and a full wave rectifier to store energy in said capacitor from said AC ports, said circuit having a first inductor to couple said AC ports to said capacitor and a second inductor to couple said DC ports to said capacitor, means for selectively switching at high speed said first inductor to +Vc at a positive terminal of said capacitor, -Vc at a negative terminal of said capacitor, or to zero volts at a point on the current return path of said AC source, or load, and means responsive to a comparison of the current i through said first inductor with a reference current iref proportional to and in a predetermined in phase or antiphase relationship with the voltage e of said AC source, or load, for controlling said high speed switching means to connect said first inductor to the positive or negative terminal of said storage capacitor, or to zero volts, depending upon whether i is greater or less than iref, and depending upon whether the voltage e is positive or negative, such that when e is positive, said first inductor is connected to zero volts if iref and to the positive terminal of said capacitor if i>iref, and when e is negative, said first inductor is connected to zero volts when iref and to the negative terminal of said capacitor if i