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This paper introduces a new ac Uninterruptible Power Supply (UPS) that has high efficiency, ac-input voltage regulation, and continuity of output power during any type of commercial ac-input power disturbance. These features are achieved in this UPS without the ac line-frequency energy storage components utilized in other UPSs to maintain output continuity during an ac-input power failure.
A theoretical model of npvn power transistor turn-off transients oriented toward circuit analysis is presented. It predicts the collector voltage waveforms under constant collector and reverse base currents in closed-form expressions. In particular, a storage period, a voltage-rise period and their dependence on currents and device parameters are revealed. It also provides a conceptual one-dimensional...
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