H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/120, 321/22
H02P 23/00 (2006.01)
Patent
CA 1199677
WAVEFORM SYNTHESIZER AND MOTOR CONTROLLER ABSTRACT OF THE DISCLOSURE A waveform synthesizer for generating single or poly-phase waveforms of selected wave shape and fre- quency for driving AC machinery including, for example, single or poly-phase induction, synchronous or other type motors or the like, includes a plurality of con- trollable power switching device pairs for selectively switching power from an oppositely poled DC source to the corresponding power utilizing circuits of the driven device. The switching device pairs are controlled to provide switched pulses of selected widths, spacings, and repetition rates to generate the desired current waveform. The power-switching device pairs are sel- ectively switched by a control circuit that includes a microprocessor-controlled memory that is divided into P addressable pages with each page including S sequen- tially accessible memory locations containing the switch- ing device pairs control information necessary to syn- thesize the desired waveform. The microprocessor is adapted to select one of the P available pages in res- ponse to prestored instructions, user input information, or condition-responsive transducer or similar informa- tion and, after selecting the desired page P, to control a presettable address counter to sequentially access the S memory locations of the selected page P at a selected access rate and to gate the so-accessed switching infor- mation to the power-switching device pairs to thereby synthesize the desired waveform.
421448
Bhagwat Pradeep M.
Saar David A.
Black & Decker Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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