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Patent Searching and Data


Title:
PHASE DETECTOR
Document Type and Number:
Japanese Patent JP2005003530
Kind Code:
A
Abstract:

To continuously, appropriately at high speed, and stably precisely detect the phase of a single-phase AC system voltage.

This phase detector has a phase shift means 6 for forming a signal having a phase different from that of the single-phase AC system voltage, wave generation means 4, 5 for generating sinusoidal waves of two phases having different phases on the basis of an estimated phase of the AC system voltage, a phase difference detection means 1 to which the AC system voltage, the outputs of the generation means 4, 5, and the output of the shift means 6 are inputted and which computes the phase difference between the phase of the AC system voltage and the estimated phase, and a phase estimation means 2, 3 which adjusts the estimated phase so that the estimated phase may coincide with the phase of the AC system voltage on the basis of the output phase difference from the detection means 1.


Inventors:
YOSHINO TERUO
Application Number:
JP2003167807A
Publication Date:
January 06, 2005
Filing Date:
June 12, 2003
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
G01R25/04; (IPC1-7): G01R25/04
Domestic Patent References:
JPH07225249A1995-08-22
JPH09133718A1997-05-20
JPS5627664A1981-03-18
JPH01301183A1989-12-05
JPH07225250A1995-08-22
Attorney, Agent or Firm:
Hidekazu Miyoshi
Iwa Saki Kokuni
Kawamata Sumio
Nakamura Tomoyuki
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu