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Patent Searching and Data


Title:
PULSE WIDTH MODULATOR
Document Type and Number:
WIPO Patent Application WO/2007/077821
Kind Code:
A1
Abstract:
A stepwise control signal (S1) generated from a control signal generator (1) and a triangular carrier signal (S2) generated from a carrier generator (2) are compared by a digital comparator (3) and its comparison signal (S3) is provided to an edge detector (20). A top bottom signal (S10) generated from a top bottom signal generator (10) is also provided to the edge detector (20). The edge detector (20) has an edge detection function for generating an edge detection signal (S20) by detecting variation in the comparison signal (S3) and outputs the edge detection signal (S20) by forbidding the edge detection function with the edge detection signal (S20) and releasing the edge detection function with the top bottom signal (S10). Based on the comparison signal (S3), the edge detection signal (S20) and the top bottom signal (S10), a PWM signal (S30) is outputted from a pulse generator (30).

Inventors:
YANG, Chongshan (())
楊 重山 (())
OZAKI, Hiroshi (())
Application Number:
JP2006/325889
Publication Date:
July 12, 2007
Filing Date:
December 26, 2006
Export Citation:
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Assignee:
KABUSHIKI KAISHA TOSHIBA (1-1 Shibaura 1-chome, Minato-ku Tokyo, 01, 1058001, JP)
株式会社 東芝 (〒01 東京都港区芝浦一丁目1番1号 Tokyo, 1058001, JP)
YANG, Chongshan (())
楊 重山 (())
International Classes:
H03K7/08
Foreign References:
JP2003070247A
JP2003110412A
US6342822B1
Other References:
See also references of EP 1971029A1
Attorney, Agent or Firm:
YAMASHITA, Hajime (YAMASHITA HAJIME PATENT OFFICE, 8th Floor Sumitomo-Hamamatsucho Building 18-16, Hamamatsucho 1-chome, Minato-k, Tokyo 13, 1050013, JP)
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