| 摘要 |
A boost-input backed-up uninterrupted power supply provides an uninterrupted output voltage to a load. The backed-up power supply has an input rectifier and filter for converting an input voltage source voltage into at least an unregulated positive dc voltage source, and an unregulated negative dc voltage source. Batteries provide respective positive and negative battery voltages at corresponding positive and negative battery output terminals. A diode isolates the unregulated positive and negative dc voltage sources from their respective battery voltages for unregulated voltage source values equal to or greater than their respective battery voltages and clamps the unregulated dc voltage values to their respective battery voltages in response to loss of the sinusoidal input voltage source. A pair of boost regulators receives power from the unregulated positive and negative dc voltage sources and provide positive and a negative regulated dc voltage with respect to the return. A dc-to-ac converter receives a reference signal and converts the positive and negative regulated dc voltage into a first uninterrupted output voltage for application to the load. The uninterrupted output voltage is continuously sampled and scaled to provide an output voltage sense signal. The output voltage sense signal is combined with the reference signal to provide an amplified error signal. The dc-to-ac converter is further characterized to continuously adjust and scale the output voltage in amplitude and phase to minimize the amplified error signal.
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