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The advent of the personal computer (PC), has created the
need for uninterruptible power supplies to insulate computers from line dips and temporary outages that plague PC reliability. In addition, numerous other applications exist for DC to AC inverters including small tools or accessories from a DC battery source in automobiles. There is a need, too, for providing battery backup in the telephone industry for 20Hz ring generators. The HIP4082 DC/AC Evaluation Board (subsequently referred to as the “eval-board”) featuring the HIP4082 is one way to increase the performance, while reducing cost of DC to AC conversion. The topology chosen uses the HIP4082 to provide a 60kHz, low voltage, square-wave to drive a small isolation power transformer. The output of this transformer is rectified, filtered, and the high voltage inverted again to produce the desired low frequency (55Hz) output waveform. (55Hz was chosen as a compromise between the 50Hz and 60Hz power standards.) A variable duty-cycle quasi-squarewave output waveform was chosen over a sinusoidal waveform for simplicity and cost-effectiveness. The 60kHz frequency of the primary-side inverter minimizes cost and size of the transformer, while the square-wave output waveform minimizes the size of the secondary-side rectifier filter. 
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