Circuit for detecting phase angle of three-phase alternating cur

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

324 7679, 324 86, 327 3, 327 5, G01R 2500

Patent

active

058251731

ABSTRACT:
A circuit for detecting the phase angle of a three-phase alternating current includes a plurality of low-pass filters installed at each input port for removing noise and high-frequency signals mixed in an alternating current input signal, a plurality of multipliers each for multiplying the signal output from each of the low-pass filter by a feedback signal, a subtracter for receiving the signals output from the plurality of multipliers and calculating an error between two signals, a loop filter for receiving the signal output from the subtracter and filtering the same, an integrator for receiving the signal output from the loop filter, time-integrating the same, and outputting an estimated digital phase angle signal, and a phase delay compensator installed between the subtracter and the loop filter, for compensating for phase delay of the input signal caused by the low-pass filters. Although the phase of the input signal is delayed by the low-pass filters for removing noise and high frequency signals installed at each input port, the delayed phase is automatically compensated for by the phase delay compensator. Thus, an estimating system can accurately estimate the phase angle.

REFERENCES:
patent: 3971996 (1976-07-01), Motlet et al.
patent: 4068210 (1978-01-01), Corkhill
patent: 4355284 (1982-10-01), Acker
patent: 4636720 (1987-01-01), Farr
patent: 4700129 (1987-10-01), Yoshizawa et al.
patent: 5299232 (1994-03-01), Larosa et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Circuit for detecting phase angle of three-phase alternating cur does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit for detecting phase angle of three-phase alternating cur, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for detecting phase angle of three-phase alternating cur will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-248183

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.