Title:
PHASE DETECTOR
Document Type and Number:
Japanese Patent JP2013190301
Kind Code:
A
Abstract:
To provide a phase detector capable of stably detecting a phase.
A phase detector 10 comprises an oscillation circuit 9 that oscillates a phase θi to be synchronized with an AC system voltage V1, generates a waveform V2 with a phase φ obtained by delaying an AC system voltage V1 on the basis of a discrete system first-order lag operation expression using an arithmetic period ts, generates a sine wave Vb that becomes sinθi and a sin wave Va that becomes cosθi on the basis of the phase θi, and synchronizes a phase φi with the AC system voltage V1 on the basis of a waveform of the AC system voltage V1, the waveform V2, the sine wave Vb and the sine wave Va.
Inventors:
ISHIZUKA TOMOTSUGU
AOYAMA FUMIO
AOYAMA FUMIO
Application Number:
JP2012056421A
Publication Date:
September 26, 2013
Filing Date:
March 13, 2012
Export Citation:
Assignee:
TOSHIBA MITSUBISHI ELEC INC
International Classes:
G01R25/04
Domestic Patent References:
| JP2005003530A | 2005-01-06 | |||
| JPH11108082A | 1999-04-20 | |||
| JPH09326690A | 1997-12-16 |
Attorney, Agent or Firm:
Kurata Masatoshi
Takakura Shigeo
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Morisezo Iseki
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori
Takakura Shigeo
Satoshi Kono
Makoto Nakamura
Yoshihiro Fukuhara
Takashi Mine
Toshio Shirane
Sadao Muramatsu
Nobuhisa Nogawa
Kocho Chojiro
Naoki Kono
Katsu Sunagawa
Morisezo Iseki
Tatsushi Sato
Takashi Okada
Mihoko Horiuchi
Takenori Masanori