초록 ▼

An uninterruptible power supply includes removable individual power modules, which for example may be 10 kilowatts each and are removable from the overall system without adversely affecting the remaining modules. Each module by means of pulse width modulated switching converts the line AC to DC wher

An uninterruptible power supply includes removable individual power modules, which for example may be 10 kilowatts each and are removable from the overall system without adversely affecting the remaining modules. Each module by means of pulse width modulated switching converts the line AC to DC where it is stored by use of capacitors or a battery and then inverted from DC back to AC. This is done on a three-phase basis without need of any low frequency transformer connection. Common input and output control units provide for the basic pulse width modulated switching signals and other necessary signals. The efficiency and speed of the system is enhanced by the use of cascode switches, saturable cores in transformers and inductors, and a proportional base drive to the switching transistors.

대표청구항 ▼

A power supply for converting single or multi-phase line AC in a regulated manner to a desired single or multi-phase output comprising: a plurality of substantially identical switched power modules connected in parallel to said AC line and to said output including input switching means switched by p

A power supply for converting single or multi-phase line AC in a regulated manner to a desired single or multi-phase output comprising: a plurality of substantially identical switched power modules connected in parallel to said AC line and to said output including input switching means switched by pulse width modulated signals for converting AC to DC and output switching means controlled by pulse width modulated signals for converting AC to DC and output switching means controlled by pulse width modulated signals for converting DC to AC; and input and output control means separate from said power modules for driving said switching means with said pulse width modulated signals whereby any one of said substantially identical switched power modules may be removed from said system without adversely affecting the remaining plurality of switched power modules, said output control means including digital phase locked loop means (PLL) for generating said pulse width modulated switching signal, said PLL including microprocessor means for comparing an output sinusoidal voltage generated by said PLL with an input sinusoidal voltage, and counter and memory means driven by said microprocessor means in accordance with said comparing, for producing said output sinusoidal voltage of a frequency determined by said microprocessor means.