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Title:
SINGLE-PHASE PHASE-LOCKED LOOP BASED ON ALL-PASS FILTER AND PHASE-LOCKING METHOD
Document Type and Number:
WIPO Patent Application WO/2018/232697
Kind Code:
A1
Abstract:
A single-phase phase-locked loop based on an all-pass filter and a phase-locking method. The single-phase phase-locked loop comprises: an all-pass filter (102), configured to receive an input grid voltage signal Ui and a frequency signal Omiga, and to determine, according to the grid voltage signal Ui and the frequency signal Omiga, a first sinusoidal signal Ualfa and a second sinusoidal signal Ubata output at an output end; a phase detector (104) connected to the output end of the all-pass filter, and configured to determine, according to the first sinusoidal signal Ualfa and the second sinusoidal signal Ubata output by the all-pass filter, and a predefined reference signal, a phase difference between the grid voltage signal Ui and the reference signal, and to determine, according to the phase difference, a phase adjustment parameter Theta output at the output end; and a proportional integral controller (106) having an input end connected to the phase detector and an output end connected to the all-pass filter, configured to determine, according to the phase adjustment parameter Theta output by the phase detector, a frequency signal Omiga output at an output end, and to output the frequency signal Omiga to an input end of the all-pass filter. The algorithm of the single-phase phase-locked loop and the phase-locking method is simple to implement, and a sinusoidal signal of varying frequency can be tracked in real time.

Inventors:
LIU XIAOHONG (CN)
LIU PENGFEI (CN)
WU RENHUA (CN)
TANG YIJUN (CN)
DENG XIANGYANG (CN)
Application Number:
PCT/CN2017/089564
Publication Date:
December 27, 2018
Filing Date:
June 22, 2017
Export Citation:
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Assignee:
SHINRY TECH CO LTD (CN)
International Classes:
H03L7/085
Foreign References:
CN102983858A2013-03-20
CN103490772A2014-01-01
CN103558436A2014-02-05
Attorney, Agent or Firm:
SCIHEAD IP LAW FIRM (CN)
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