Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1995-08-29
1997-08-12
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 64, 323299, 323300, 323301, H02J 700
Patent
active
056568711
ABSTRACT:
An uninterrupted power supply with improved circuit arrangement includes a controller, a detecting circuit and a control circuit. When the incoming AC voltage is normal and in a positive half-wave cycle, an input pin of the controller detects the actual voltage level of the secondary voltage of a transformer. When the incoming AC voltage is in a negative half-wave cycle, the input pin of the controller receives a sinusoidal input waveform voltage based on the voltage Vcc which acts as a reference voltage, and the controller processes the sinusoidal input waveform voltage by subtracting the secondary voltage of the transformer from the voltage reference Vcc to obtain a sinusoidal half-wave voltage with positive half-wave cycle. The controller combines the positive and negative half-wave cycle signals to obtain a composite voltage, and then calculates the RMS value of the composite voltage so as to determine the changing situation of the incoming AC voltage. The controller further actuates a series of transistors to energize an autotransformer to supply a stable regulated voltage.
Lockett Kim
Shoop Jr. William M.
Sysgration Ltd.
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