Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1984-12-27
1986-06-17
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 98, 364486, H02M 112
Patent
active
045959765
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 waveforms. 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 required degree of noise immunity. In order to overcome this problem, an inverter control according to the present 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 representing a second output condition, such as a pulse. Memory address decoding logic includes means for accessing a particular memory block in each memory in accordance with a control signal representing the desired waveform to be generated at each phase output. Also included 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 memory. 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 accomplishes individual phase regulation of the inverter output and is relatively immune to noise which can cause distortion in the output power.
REFERENCES:
patent: 4099109 (1978-07-01), Abbondanti
patent: 4290104 (1981-09-01), Woehrle et al.
patent: 4348734 (1982-09-01), Dougherty
patent: 4387421 (1983-06-01), Zach et al.
patent: 4466052 (1984-08-01), Thrap
patent: 4466070 (1984-08-01), Claussen
patent: 4527226 (1985-07-01), Glennon
"A Digital Logic PWM Speed Control for Single and Polyphase AC Motors" by T. Masur.
Sundstrand Corporation
Wong Peter S.
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