Controller for inverter

Abstract

Abstract PURPOSE:To enable the whole inverter-controlling apparatus to be constituted with an one-chip LSI, by forming the control signals to turn on/off switching elements in a logical pattern. CONSTITUTION:Control signals, in a given logical pattern, to obtain voltage waveforms corresponding to the set frequencies of the inverter are stored in an ROM11 so as to be equivalent to 30 deg. (180/n, n=6) in the electric angle of the output voltage waveform. According to signals S3 from a speed setting circuit 10, control signals are read out from the ROM 11 and outputted from terminals P1-P3 of a data selector 13. On the other hand, the clock signals S4 passed through a rate multiplier 12 are inputted to an up/down counter 14. According to count signals S5 thereof, addresses in the ROM11 are designated, and according to signals S6, logical values 1 for one cycle of the output waveform are outputted from the output terminals CH0-CH11 of a 12(2n) channel decoder 15 and waveform-synthesized 19 with the output of the data selector 13 to output a three-phase sine-wave voltage.

Inventors

• 👤 Takuo Ono
• 👤 Shigeo Fukui
• 👤 Junichi Okura

Bibliographic Details