Title:
パルス幅変調装置
Document Type and Number:
Japanese Patent JP4585970
Kind Code:
B2
Abstract:
A step form control signal (S1) generated by a control signal generating device (1) and a triangular wave carrier signal (S2) generated by a carrier generating device (2) are compared by a digital comparator (3) and this comparison signal (S3) is supplied to an edge detection device (20). Also, a top/bottom signal (S10) generated by a top/bottom signal generating device (10) is supplied to the edge detection device (20). The edge detection device (20) is provided with an edge detection function that generates an edge detection signal (S20) by detecting change of the comparison signal (S3). The edge detection function of the edge detection device is inhibited by the edge detection signal (S20); inhibition of the edge detection function is cancelled by the top/bottom signal (S10) so that the edge detection signal (S20) is output. A PWM signal (S30) is output from the pulse generating device (30) in accordance with the comparison signal (S3), edge detection signal (S 20) and top/bottom signal (S10).
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Inventors:
Hiroyuki Tanaka
Yang Shigeyama
Hiroshi Ozaki
Yang Shigeyama
Hiroshi Ozaki
Application Number:
JP2006000800A
Publication Date:
November 24, 2010
Filing Date:
January 05, 2006
Export Citation:
Assignee:
oki Semiconductor Co., Ltd.
Toshiba Corporation
Toshiba Corporation
International Classes:
H03K7/08
Domestic Patent References:
| JP9284107A | ||||
| JP6188702A | ||||
| JP6481667A | ||||
| JP1197989A |
Attorney, Agent or Firm:
Kakimoto Yasunari