Title:
METHOD AND APPARATUS FOR DIVISION OF FREQUENCY OF AC VOLTAGE BY FREQUENCY DIVISION FACTOR OF NONINTEGER
Document Type and Number:
Japanese Patent JPH04275719
Kind Code:
A
Abstract:
PURPOSE: To obtain a method for dividing the frequency of an AC voltage by a non-integer frequency dividing factor by selecting two period groups so that a specific relation can be established between the generating periods of the period groups. CONSTITUTION: A device for dividing frequency of AC voltage is provided with a decoder 1, accumulators 9 and 21, shift registers 12 and 13, RAMs 15 and 16, a multiplexer 17, and a switchable frequency divider 23. The device alternately generates a period group having a frequency (a) divided by a frequency dividing factor (m) and another period group having a frequency (b) divided by another frequency dividing factor (n) and switches the period groups to each other with a signal having a prescribed value by selecting the V-period of an AC voltage having a frequency f1 so that a relation, (a+b)/f2 =V/f1 , can be established between the V-period expressed by am+bm=V and the frequency f1 by correlating the V-period with one frame. Then, the device divides the frequency f1 of the AC voltage to a second frequency f2 .
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Inventors:
PIRUMINNNIKORAUSU FUERUKU
Application Number:
JP33333991A
Publication Date:
October 01, 1992
Filing Date:
December 17, 1991
Export Citation:
Assignee:
SIEMENS AG
International Classes:
H03K23/66; H03K23/64; H03K23/68; H03M7/00; H04J3/07; (IPC1-7): H03K23/64
Attorney, Agent or Firm:
Toshio Yano (2 outside)