Switching technique for efficient electrical power utilization
AssigneeAdvanced Environmental Technologies, LLC
InventorMohamed Sirajuddin
Life of this patent
Estimating the term…
Abstract
An active phase angle correction circuit which corrects the phase angle between voltage and current in an AC supply varies the capacitive loading of the AC mains to reduce the phase angle to near zero by detecting the phase angle, reactively and resistively loading the AC mains in steps until the phase angle is at a desired level close to zero, and then maintaining or incrementally adjusting the loading. The applied loading may be continuously switched in and out at a rate much greater than the mains supply frequency.
Claims22
A phase angle correction circuit for an AC supply consisting of a phase angle detection circuit detecting the difference in phase between voltage and current of the AC supply, a counter circuit whose peak count is a function of the prevailing phase angle detected, a switchable reactance bank, characterised in at least some of the reactances in the bank being connectable across the power supply based on the maximum count reached by the counter.
A method of correcting the phase angle of an alternating current mains supply by monitoring the instantaneous phase angle between supply voltage and supply current, connecting and disconnecting across the mains supply for at least a fraction of a cycle per cycle of the alternating current one or more of a number of compensating circuits and varying the connected compensating circuits in accordance with the monitored phase angle.
A method of correcting the phase angle between voltage and current of an alternating current mains supply by monitoring the instantaneous phase angle between supply current and supply voltage, connecting at least some phase angle compensating components to the mains supply where the phase angle is lagging, repetitively monitoring the instantaneous phase angle between supply current and supply voltage characterised in incrementally increasing the connected compensation when the phase angle is detected as lagging, and removing all compensation where the phase angle is detected as leading.
Dependencies are inferred from the claim text.