Leo F. Valenti - East Greenwich RI, US James C. Daly - Ave Maria FL, US
Assignee:
V Square/R, LLC - North Kingstown RI
International Classification:
G05F 1/455
US Classification:
323235, 323241, 323246, 323300
Abstract:
A system and method for regulating the root mean square (RMS) voltage delivered to a load by an alternating current (AC) electrical circuit having a line voltage. To avoid radio frequency interference (RFI), the load is disconnected from the AC electrical circuit when energy stored in the load is at or near zero and is reconnected when the line voltage is at or near zero. Inductive loads are disconnected when the line current is at or near zero while capacitive loads are disconnected when the line voltage is at or near zero. The duration of the disconnection does not exceed one half-cycle of the fundamental frequency. Disconnections alternate between removing positive voltage half-cycles and negative voltage half-cycles to avoid a direct current (DC) bias. A system incorporating digital logic elements is provided for implementing the method and for detecting whether the load is inductive or capacitive.
A circuit for delivering a predetermined amount of energy to a load without regulating the voltage across the load is described. An a. c. or rectified sine wave is controlled. There is no capacitive smoothing of the applied voltage. A time counter is activated at the beginning of each half cycle of the sine wave. At a predetermined point in time, a switch is closed and power is delivered to the load. At another predetermined time in the same half cycle, the actual applied voltage is measured. The detected voltage value and corresponding time of measurement comprise a unique signature enabling identification of the specific sine function for that half cycle. The sine function signature permits calculation of either the amount of total energy delivered or the RMS voltage level as a function of progressing time, and thus, determination of the time period for which the line switch must remain closed in order to deliver the predetermined amount of total energy, or to maintain a predetermined RMS voltage. When the time counter reaches the computed necessary time period, the switch opens and power delivery is stopped.
Leo Valenti 1970 graduate of Roselle Park High School in Roselle park, NJ is on Classmates.com. See pictures, plan your class reunion and get caught up with Leo and other high ...