Electricity: power supply or regulation systems – Output level responsive – Phase controlled switching using electronic tube or a three...
Patent
1996-12-30
1998-03-17
Wong, Peter S.
Electricity: power supply or regulation systems
Output level responsive
Phase controlled switching using electronic tube or a three...
323235, 323239, 323220, 323223, 307 64, 363 89, G05F 1613
Patent
active
057291209
ABSTRACT:
Instabilities in the output voltage provided from an AC power supply system such as an uninterruptible power supply connected to a power factor correcting load are suppressed by a dynamic voltage regulation stabilizer system which is connected across the output lines from the power supply system to the load. The DVR stabilizer system includes a rectifier connected to the power supply system output lines. A capacitor is connected across the output nodes of the rectifier. Switching devices form a bridge that connects the capacitor to the output lines. Selected switching devices in the bridge are turned on for a selected duration encompassing the time of the peak of each half-cycle of the AC voltage waveform provided by the power supply system. During normal operation, where the peak AC voltage from the power supply system is substantially constant, the capacitor charges up through the rectifier to a voltage level near the peak value of the AC voltage waveform. When the peak AC voltage level rises above the normal peak level, the capacitor clamps the voltage across the output lines at a value near the steady state peak value. When the peak voltage level drops below the normal peak value, the capacitor discharges through the switching device bridge during the peak of the half-cycle to fill in for the voltage drop. The DVR stabilizer system thus reduces the effect of interactions between the power supply system and the PFC load, to thereby dampen oscillations and stabilize the AC voltage waveform.
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Davidson Robert R.
Kohls Gregory C.
Stich Frederick A.
Zahrte, Sr. Donald K
General Signal Corporation
Riley Shawn
Wong Peter S.
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