초록 ▼

A primary and at least one backup alternating voltage source are coupled to a common load to provide interrupt free electric current to the load through a simplified interconnecting network. Phase control of all but one of the sources is accomplished by monitoring the phase difference across choke c

A primary and at least one backup alternating voltage source are coupled to a common load to provide interrupt free electric current to the load through a simplified interconnecting network. Phase control of all but one of the sources is accomplished by monitoring the phase difference across choke coils coupling the sources to the load.

대표청구항 ▼

An interrupt-free power supply comprising at least two AC voltage sources of equal frequency, each having a set of output terminals, at least one of the terminals being grounded; a number of inductors equal to the number of AC voltage sources, each coupling the ungrounded output terminal of a corres

An interrupt-free power supply comprising at least two AC voltage sources of equal frequency, each having a set of output terminals, at least one of the terminals being grounded; a number of inductors equal to the number of AC voltage sources, each coupling the ungrounded output terminal of a corresponding one of said AC voltage sources to a common load, whereby the power delivered to the common load by each of said AC voltage sources is related to a voltage phase angle across its associated inductor; a number of feedback circuit means equal to the number of AC voltage sources, each of said feedback circuit means including phase comparator means for sensing the phase difference between the load voltage and the voltage at the ungrounded output terminal of each of said AC voltage sources to provide a phase control feedback signal for controlling the phase of the associated AC voltage source, whereby if the phase of all of said AC voltage sources, with the exception of one of said AC voltage sources, is constrained to zero with respect to that of said load, only said one of said AC voltage sources not so constrained delivers load current in proportion to a sine of the phase angle between the output terminal of said one of said AC voltage sources and said load; safety backup means comprising a battery-energized static inverter having a set of output terminals, at least one of the terminals being grounded; additional feedback circuit means including phase comparator means for sensing the phase difference between the load voltage and the voltage at the ungrounded output terminal of said static inverter to provide a phase control feedback signal for controlling the phase of said static inverter, said additional feedback circuit means being connected in common with said number of feedback circuit means; and an additional inductor coupling the output terminal of said static inverter to said load, whereby upon failure of all said AC voltage sources, said static inverter supplies a reduced load.