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Patent Searching and Data


Title:
DEVICE AND METHOD FOR CONTROLLING PWM
Document Type and Number:
Japanese Patent JPH06339278
Kind Code:
A
Abstract:

PURPOSE: To enable a PWM controller used for inverters, etc., for controlling the torque or speed of induction motors, synchronous motors, etc., to change a carrier frequency over a wide range and to make the carrier frequency suit able for the characteristic of a used switching element so that the controller can be used for various switching elements.

CONSTITUTION: In a PWM controller 20G which generates a PWM control signal PU by comparing a voltage commanding value Vuc with triangular waves CA, the triangular waves CA are generated by means of an up-down counter 32 the counting direction of which is inverted when a count value specified by a frequency setting value Fs is reached and, at the same time, the magnitude of the voltage commanding value Vuc is changed in accordance with the frequency setting value Fs.


Inventors:
TAKAHASHI TORU
TACHIKAWA ATSUO
ODERA NOBUYUKI
NISHIDA YOSHIHARU
YAMASHITA TOSHIRO
TAKAKADO YUZO
INOUE KENJI
Application Number:
JP1993000125838
Publication Date:
December 06, 1994
Filing Date:
May 27, 1993
Export Citation:
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Assignee:
KOBE STEEL LTD
SHINKO ELECTRIC CO LTD
International Classes:
H02M7/48; H02P27/06; H02P27/08; (IPC1-7): H02M7/48; H02P7/63
Attorney, Agent or Firm:
久保 幸雄