Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Patent
1997-03-27
1999-03-23
Lam, Tuan P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
327176, 318811, H03K 708
Patent
active
058865551
ABSTRACT:
To produce pulses in a cyclically repetitive mode while modifying the production frequency, a counter looped on itself is used. The outputs of this counter are connected to the address inputs of a memory. The signals read in the memory represent pulses to be produced. When it is sought to increase the period of reading the totality of the memory gradually, some of the words of this memory are read for a greater period of time. In the invention, words are chosen for which this addressing will be maintained by comparing the reverse of the reading address with a given value and by deciding, as a function of the result of this comparison, whether the word read at this address must be read for a longer duration or not. It is shown that this circuit is very easy to make and requires but few components. The circuit made can be used particularly in the field of the control of three-phase synchronous motors.
REFERENCES:
patent: 4356544 (1982-10-01), Ono et al.
patent: 4603425 (1986-07-01), Berlinsky et al.
patent: 4962976 (1990-10-01), Takahashi et al.
patent: 5060179 (1991-10-01), Sharp
patent: 5589805 (1996-12-01), Zuraski et al.
French Search Report from FR 9604015, filed Mar. 29, 1996.
1990 IEEE Industry Applications Society Annual Meeting; vol. 2, Oct. 7, 1990, pp. 997-1004, XP000203419, G. Joos et al.; A Three Phase Model Reference Adaptive PWM Technique With Improved Features.
Bildgen Marco
Tessier Maxime
Lam Tuan P.
SGS-Thomson Microelectronics S.A.
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