Title:
PHASE SYNCHRONIZATION DETECTION CIRCUIT IN GENERATOR
Document Type and Number:
Japanese Patent JP3958255
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a phase synchronization detection circuit in the synchronous closing unit of a generator strong against zero-cross noise by employing a hybrid circuit of analog circuit and digital circuit.
SOLUTION: The phase synchronization detection circuit comprises a phase shift means for delaying the phase of the output from a voltage input circuit in a generator by a quarter of wavelength, a means for multiplying the output from the phase shift means and the output from the voltage input circuit of a bus, a comparison means outputting the signal at a position where the plus and minus are equalized in the envelope of the output waveform from the multiplying means, and a means for removing the signal at a position of 180 ° phase shift between the bus and generator voltages from the output of the comparison means. Since a larger difference can be taken by multiplying the voltages of the bus and the generator as compared with simple addition or subtraction, a synchronization point can be detected with high precision.
Inventors:
Atsushi Hayashide
Inubashiri Hideki
Yoshio Kijima
Yoshio Hino
Takashi Saito
Shunichi Isozaki
Inubashiri Hideki
Yoshio Kijima
Yoshio Hino
Takashi Saito
Shunichi Isozaki
Application Number:
JP2003175254A
Publication Date:
August 15, 2007
Filing Date:
June 19, 2003
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
Shoei Electric Co., Ltd.
Shoei Electric Co., Ltd.
International Classes:
H02J3/44; (IPC1-7): H02J3/44
Domestic Patent References:
| JP1291666A | ||||
| JP60113628A | ||||
| JP9009507A | ||||
| JP2000139029A | ||||
| JP6311656A |
Attorney, Agent or Firm:
Masahisa Takahashi
Hisamaru Hanada
Hisamaru Hanada
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