H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/60
H02M 1/12 (2006.01) H02M 7/5387 (2006.01)
Patent
CA 1239987
Inverter Control Abstract Prior inverter controls have been developed which are capable of controlling switches in an inverter to produce one of a plurality of polyphase output wave- forms. Such controls utilize one or more memories to store a plurality of modulation patterns for controlling the switches. However, such types of inverter controls cannot provide individual phase regulation with the re- quired degree of noise immunity. In order to overcome this problem, an inverter control according to the pre- sent invention includes a plurality of memories, one for each phase, each of which is subdivided into a plurality of memory blocks which store a number of bytes, each of which is eight bits in length. Each bit is a zero or one, with a zero representing a first output condition for the respective phase, such as a notch, and a one re- presenting a second output condition, such as a pulse. Memory address decoding logic includes means for access- ing a particular memory block in each memory in accor dance with a control signal representing the desired waveform to be generated at each phase output. Also in- cluded are means for sequentially addressing the bytes within a memory block so that the bytes stored within the block are sequentially provided at an output of the mem- ory. A multiplexer/latch latches a particular bit of each byte so that a control waveform is developed at the output of the latch. The control waveform is utilized to derive operating signals for switches in the respective inverter phase so that the desired waveform is generated. The inverter control of the present invention accomplish- es individual phase regulation of the inverter output and is relatively immune to noise which can cause distortion in the output power.
495927
Riches Mckenzie & Herbert Llp
Sundstrand Corporation
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