Signal generation circuit

Details Signal generation circuit Signal generation circuit

1990-03-30

1993-02-02

Black, Thomas G.

Boots, shoes, and leggings

318811, 363 41, 364150, G06F 1520

Patent

active

051843102

ABSTRACT:
Pulse wave modulation waveform signals of three-phase alternating-current necessary for driving a compressor used in an air-conditioner incorporating an inverter circuit are, for example, generated by preliminarily storing the reference waveform data in a ROM, reading out sequentially, and executing specified data conversion instructions. In a signal generation circuit of the invention, a waveform generation circuit for execution of such data conversion is provided independently of a central processing unit (CPU), and after setting initial data from the CPU, the waveform data are directly read into the waveform generation circuit from the ROM by DMA transfer system to perform data conversion. That is, the CPU is not related with the data conversion, and therefore it is not necessary to create waveform data reading program and data conversion program.

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patent: 4961130 (1990-10-01), Kirchberg, Jr.
patent: 5021726 (1991-06-01), Reinhardt et al.

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