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公开(公告)号:WO2021152788A1
公开(公告)日:2021-08-05
申请号:PCT/JP2020/003523
申请日:2020-01-30
Applicant: 東芝三菱電機産業システム株式会社
Abstract: 本発明の実施形態によれば、電力系統の三相交流電力の三相の電圧信号を直交する二相の電圧信号に変換し、二相の電圧信号を回転座標系の電圧信号に変換し、回転座標系の電圧信号の移動平均を演算し、移動平均を演算した後の回転座標系の電圧信号を逆変換することにより、三相の電圧信号から直交する二相の電圧信号を生成する直交座標信号生成部と、二相の電圧信号を基に電力系統の角周波数を演算する角周波数演算部と、角周波数から電力系統の系統周波数を演算する演算器と、を有する周波数演算部と、を備え、周波数演算部は、演算器と直列に設けられ、系統周波数の高周波成分を抑制するローパスフィルタをさらに有する系統周波数検出器が提供される。これにより、系統周波数の変化に対して高速に追従できるとともに、系統擾乱が発生した際にも系統周波数の誤検出を抑制できる系統周波数検出器が提供される。
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公开(公告)号:WO2021106072A1
公开(公告)日:2021-06-03
申请号:PCT/JP2019/046159
申请日:2019-11-26
Applicant: 三菱電機株式会社
IPC: G01R23/12
Abstract: 第1のクロック信号と、第1のクロック信号と周波数が同じで、第1のクロック信号と位相が異なる第2のクロック信号とを出力する信号源(11)と、信号源(11)から出力された第1のクロック信号を用いて、周波数検出対象の信号をアンダーサンプリングして、アンダーサンプリングの結果を示す第1のサンプリング信号を出力し、信号源(11)から出力された第2のクロック信号を用いて、周波数検出対象の信号をアンダーサンプリングして、アンダーサンプリングの結果を示す第2のサンプリング信号を出力するS/H回路(12)と、S/H回路(12)から出力された第1のサンプリング信号とS/H回路(12)から出力された第2のサンプリング信号との位相差を算出し、位相差に基づいて、周波数検出対象の信号の周波数を算出する周波数算出回路(14)とを備えるように、周波数検出回路(3)を構成した。
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公开(公告)号:WO2014027423A1
公开(公告)日:2014-02-20
申请号:PCT/JP2012/070937
申请日:2012-08-17
Inventor: 関 建平
CPC classification number: G01R19/2513 , G01R19/0007 , G01R19/2509 , G01R19/252 , G01R23/06 , G01R23/12
Abstract: 周波数係数算出部は、測定対象となる交流電圧を所定のデータ収集サンプリング周波数でサンプリングした電圧瞬時値データの中から、データ収集サンプリング周波数よりも小さく、且つ、当該交流電圧の周波数以上となるゲージサンプリング周波数で抽出した連続する少なくとも4点の電圧瞬時値データにおける隣接する2点の電圧瞬時値データ間の先端間距離を表す3点の差分電圧瞬時値データ(v 21 ,v 22 ,v 23 )のうち、中間時刻以外の差分電圧瞬時値の和(v 21 +v 23 )の平均値((v 21 +v 23 )/2)を中間時刻における差分電圧瞬時値(v 22 )で正規化した値((v 21 +v 23 )/(2v 22 ))を周波数係数(f C )として算出する。
Abstract translation: 频率系数计算单元从采用预定数据采集采样频率对待测量的交流电压获得的电压瞬时值的数据中的采样频率提取连续的至少四点电压瞬时值的数据, 频率小于数据采集频率,大于或等于交流电压的频率。 在表示四点电压瞬时值中相邻两个电压瞬时值数据之间的端间距离的三点差电压瞬时值(v21,v22,v23)的数据中,频率系数计算单元计算归一化值 (v21 + v23)/(v21 + v23))的平均值((v21 + v23)/ 2)的频率系数(f21))作为频率系数(fc) 中间时间通过差分电压瞬时值(v22)在中间时间。
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公开(公告)号:WO2014012179A1
公开(公告)日:2014-01-23
申请号:PCT/CA2013/050524
申请日:2013-07-08
Applicant: NANOWAVE TECHNOLOGIES INC.
Inventor: NICHOLLS, Charles, William, Tremlett , HAMDANE, Walid
IPC: G01R23/12
Abstract: Circuits and methods for identifying or verifying frequencies are disclosed herein. A frequency verification circuit comprises: an input port for receiving an input signal; a phase frequency difference detector for determining a difference in phase and frequency between the input signal and a feedback signal and for providing a control signal based on the detected difference; a voltage controlled crystal oscillator for producing an output signal based on the control signal; and a feedback loop including a feedback divider for frequency dividing the output signal by a factor R to produce the feedback signal, the feedback divider being programmable to a plurality of values of the factor R to correspond to a plurality of different test frequencies.
Abstract translation: 本文公开了用于识别或验证频率的电路和方法。 频率验证电路包括:用于接收输入信号的输入端口; 相位差检测器,用于确定输入信号和反馈信号之间的相位和频率差,并用于基于检测到的差异提供控制信号; 用于产生基于所述控制信号的输出信号的压控晶体振荡器; 以及反馈分配器,其包括用于将所述输出信号分频为因子R的反馈分配器,以产生所述反馈信号,所述反馈分配器可编程为所述因子R的多个值,以对应于多个不同的测试频率。
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公开(公告)号:WO2007047524A3
公开(公告)日:2007-04-26
申请号:PCT/US2006/040232
申请日:2006-10-16
Applicant: MICRO MOTION, INC. , MCANALLY, Craig, B. , HENROT, Denis, M.
Inventor: MCANALLY, Craig, B. , HENROT, Denis, M.
Abstract: Meter electronics (20) for processing sensor signals in a flow meter is provided according to an embodiment of the invention. The meter electronics (20) includes an interface (201) for receiving a first sensor signal and a second sensor signal and a processing system (203) in communication with the interface (201) and configured to receive the first sensor signal and the second sensor signal, generate a ninety degree phase shift from the first sensor signal, and compute a frequency from the first sensor signal and the ninety degree phase shift. The processing system (203) is further configured to generate sine and cosine signals using the frequency, and quadrature demodulate the first sensor signal and the second sensor signal using the sine and cosine signals in order to determine the phase difference.
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公开(公告)号:WO1998000722A1
公开(公告)日:1998-01-08
申请号:PCT/AU1997000407
申请日:1997-06-27
Applicant: CURTIN UNIVERSITY OF TECHNOLOGY , HILL, Martin
Inventor: CURTIN UNIVERSITY OF TECHNOLOGY
IPC: G01R23/12
CPC classification number: G01R23/12
Abstract: A digital frequency detector (10) and method for digitally detecting arbitrarily small phase changes between a signal waveform and a reference waveform. Both the reference waveform and the signal waveform are sampled at a rate related to the clock frequency fc, and separately fed into two arrays of simple frequency detectors (12, 14). Each simple frequency detector in each array has a different starting phase with respect to the reference waveform and the signal waveform respectively. Phase slips between the reference waveform and the sampling frequency and phase slips between the signal waveform and the sampling frequency are measured by the detector arrays (12, 14). These phase slips, called "slip events", are combined in circuit (16) which produces an output indicative of phase slips between the reference waveform and the signal waveform. Using this phase slip information, the instantaneous frequency difference between the signal and reference waveforms can be determined.
Abstract translation: 一种数字频率检测器(10)和用于数字检测信号波形与参考波形之间任意小的相位变化的方法。 以与时钟频率fc相关的速率对参考波形和信号波形进行采样,分别馈入两个简单频率检测器阵列(12,14)。 每个阵列中的每个简单频率检测器分别相对于参考波形和信号波形具有不同的起始相位。 通过检测器阵列(12,14)测量参考波形与采样频率之间的相位差和信号波形与采样频率之间的相位滑移。 称为“滑动事件”的这些相位滑差被组合在电路(16)中,其产生指示参考波形和信号波形之间的相位差的输出。 使用该相位滑动信息,可以确定信号和参考波形之间的瞬时频率差。
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公开(公告)号:WO2022177818A1
公开(公告)日:2022-08-25
申请号:PCT/US2022/016107
申请日:2022-02-11
Applicant: MURATA MANUFACTURING CO., LTD. , MURATA POWER SOLUTIONS
Inventor: JAKSA, Rubinic
Abstract: A dual active bridge (DAB) converter includes a variable inductor and a controller configured or programmed to control the DAB converter using triple-phase-shift control. The controller can include a first proportional-integral controller to determine a parameter x based on comparison of a reference voltage and a measured voltage corresponding to either an HV voltage or an LV voltage; a voltage ratio calculator to determine a voltage ratio; a boundary calculator to calculate, based on the voltage ratio, a first boundary value corresponding to a boundary between low and medium power modes and a second boundary value corresponding to a boundary between the medium and high power modes; and a phase-shift-ratio calculator to determine phase shift ratios used in the triple-phase-shift control based on the parameter x, the voltage ratio, the first boundary value, and the second boundary value.
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8.
公开(公告)号:WO2021146376A1
公开(公告)日:2021-07-22
申请号:PCT/US2021/013367
申请日:2021-01-14
Inventor: ZHAN, Lingwei , XIAO, Bailu , YIN, He , LI, Fuhua , YAO, Wenxuan , LI, Zhi , KING, Thomas , LIU, Yilu
Abstract: Respective phasor values are recursively computed from respective ones of a series of signal samples for a node of a power system such that each phasor value is computed from a previously computed phasor value. Frequency values are recursively computed from the phasor values for respective ones of the signal samples. Recursive computing of frequency values may include computing respective phase angle values from respective ones of the phasor values, recursively computing coefficient values for a polynomial that fits the phase angle values, and recursively computing the frequency values from the coefficient values. The samples may be generated at a sampling rate and the phasor values and the frequency values may be produced at a rate that is the same as the sampling rate. Embodiments may provide methods, apparatus and computer readable media that implement such operations.
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公开(公告)号:WO2019099606A1
公开(公告)日:2019-05-23
申请号:PCT/US2018/061187
申请日:2018-11-15
Applicant: MICROCHIP TECHNOLOGY INCORPORATED
Inventor: KUMAR, Ajay , BARTLING, James E.
Abstract: An apparatus includes a capacitor, a reference voltage, an input signal to be measured, and a frequency calculation circuit. The frequency calculation circuit is configured to select a capacitance value for the capacitor, charge the capacitor with the reference voltage, discharge the capacitor to a threshold voltage, and, based on a comparison of time to discharge the capacitor to the threshold voltage with a clock cycle of the input signal, determine a frequency of the input signal.
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10.
公开(公告)号:WO2019040843A8
公开(公告)日:2019-02-28
申请号:PCT/US2018/047903
申请日:2018-08-24
Applicant: INFICON, INC.
Inventor: RINZAN, Mohamed, Buhary , SONG, Chunhua , LAKEMAN, Steve, James
Abstract: A monitoring device for monitoring a fabrication process in a fabrication system. The monitored fabrication system includes a process chamber and a plurality of flow components. A quartz crystal microbalance (QCM) sensor monitors one flow component of the plurality of flow components of the fabrication system and is configured for exposure to a process chemistry in the one flow component during the fabrication process. A controller measures resonance frequency shifts of the QCM sensor due to interactions between the QCM sensor and the process chemistry in the one flow component during the fabrication process. The controller determines a parameter of the fabrication process in the process chamber as a function of the measured resonance frequency shifts of the QCM sensor within the one flow component.
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