Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-07-18
2008-11-25
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S607000, C341S112000, C341S116000
Reexamination Certificate
active
07456603
ABSTRACT:
A small-sized and low-cost phase detection circuit which has improved noise immunity. The phase detection circuit comprises a multiplier for multiplying an input signal by a reference signal and outputting a first signal, an integration circuit for integrating the first signal and outputting a second signal, a phase estimation circuit for estimating phase information based on the second signal, and a reference signal generation circuit for generating the reference signal based on the estimated phase information. Since the phase is detected based on information representing an entire waveform, the influence of local noise can be diluted and noise immunity can be improved.
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European Search Report dated Nov. 2, 2006 (Eleven (11) pages).
Kanekawa Nobuyasu
Koseki Tomonobu
Oyama Katsuya
Sasaki Shoji
Crowell & Moring LLP
Hitachi , Ltd.
Leykin Rita
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