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WO2018146844A1 - Dispositif et procédé de détection de passage par zéro - Google Patents

Dispositif et procédé de détection de passage par zéro Download PDF

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Publication number
WO2018146844A1
WO2018146844A1 PCT/JP2017/031754 JP2017031754W WO2018146844A1 WO 2018146844 A1 WO2018146844 A1 WO 2018146844A1 JP 2017031754 W JP2017031754 W JP 2017031754W WO 2018146844 A1 WO2018146844 A1 WO 2018146844A1
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WO
WIPO (PCT)
Prior art keywords
zero
integration
value
signal
cross
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/031754
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English (en)
Japanese (ja)
Inventor
則和 万木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RKC Instrument Inc
Original Assignee
RKC Instrument Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RKC Instrument Inc filed Critical RKC Instrument Inc
Priority to JP2018566744A priority Critical patent/JP6792177B2/ja
Priority to CN201780083075.2A priority patent/CN110192113B/zh
Publication of WO2018146844A1 publication Critical patent/WO2018146844A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero

Definitions

  • the present invention relates to a zero-cross detection device and a zero-cross detection method for detecting a zero-cross position of an AC signal.
  • Patent Document 1 discloses a zero-cross signal output device corresponding to such a problem.
  • Patent Document 1 has a problem that it is difficult to divert the same circuit to another application because a circuit dedicated to zero cross detection is used.
  • an object of the present invention is to provide a zero-cross detection device using a general-purpose input circuit that is not easily affected by noise and can be used for other purposes.
  • the zero cross detection unit selects two from the plurality of integration ranges, and detects the position of the zero cross of the AC signal based on an area difference that is a difference between integration values for the two selected integration ranges.
  • the zero-cross detection device according to configuration 1, characterized in that:
  • the zero cross detection unit selects an arithmetic expression for zero cross detection of the AC signal based on at least one of the integral value or the area difference, and based on the selected arithmetic expression and the area difference.
  • the zero-cross detection device according to any one of configurations 2 to 4, wherein the zero-cross of the AC signal is detected.
  • the zero-cross detection unit detects a zero-cross position of the AC signal a plurality of times and calculates a zero-cross position based on at least one of the zero-cross positions detected a plurality of times.
  • the zero cross detection apparatus in any one.
  • the measurement value calculation unit calculates an average value or an execution value of the AC signal based on an integration value for the plurality of integration ranges and an integration value for a period other than the plurality of integration ranges.
  • the zero cross detection apparatus according to Configuration 8.
  • detection means that the position of the zero cross is calculated and uniquely determined, or the range where the zero cross exists is specified, and the same applies to the following.
  • the input unit 110 is a signal acquisition unit from an AC power source (not shown) or the like, and receives an AC signal.
  • the absolute value conversion unit 120 is configured by a full-wave rectification circuit or the like, and has a function of converting an AC signal input from the input unit 110 into an absolute value and outputting the absolute value.
  • the VF conversion unit 130 includes a VF converter (Voltage-to-Frequency converter) and the like, and has a function of converting the absolute value of the AC signal input from the absolute value conversion unit 120 into a pulse train and outputting it. .
  • the instructing unit 170 includes an integration start signal and an integration stop signal for instructing start and stop of integration processing of the integral value calculating unit 140 based on an integration range, integration number, and operation timing, which will be described later, set in advance, and a recording unit 150.
  • a recording instruction signal and a detection instruction signal to the zero-cross detector 160 are output.
  • the integration value calculation unit 140 is configured by a pulse counter or the like. Based on the integration start signal and the integration stop signal from the instruction unit 170, the integration value calculation unit 140 calculates the integration value of the pulse train input from the VF conversion unit 130, and It has a function of outputting an integral value.
  • the recording unit 150 is configured by a RAM or the like.
  • moves independently based on the instruction
  • the process proceeds to step 470.
  • the instruction unit 170 outputs an integration start signal and an integration stop signal to the integration value calculation unit 140 based on the previously set integration range, number of integrations, and operation timing.
  • the “integration range” indicates a period from when the integration start signal is input to when the integration stop signal is input, and “operation timing” indicates the interval between the integration start signal and the next integration start signal.
  • the instruction unit 170 outputs an integration stop signal to the integral value calculation unit 140 and simultaneously outputs a recording instruction signal to the recording unit 150.
  • the instruction unit 170 repeats the output operation of the integration start signal, the integration stop signal, and the recording instruction signal for the number of integrations set in advance. Further, the integration value calculation unit 140 integrates the pulse signal input from the VF conversion unit 130 as a count value from when the integration start signal is input from the instruction unit 170 to when the integration stop signal is input, When the integration stop signal is input, the count value is output to the recording unit 150 as an integral value. The integration value calculation unit 140 resets the internal count value at the same time that the integration start signal is input from the instruction unit 170. Further, the integration value calculation unit 140 does not integrate the count value except after the integration start signal is input from the instruction unit 170 until the integration stop signal is input. When the recording instruction signal is input from the instruction unit 170, the recording unit 150 records the integration value input from the integral value calculation unit 140.
  • the possible value of the integration range ⁇ is determined as in the following formula 2.
  • the difference (area difference) between the integrated values Sa and Sb can be expressed as the following Equation 3.
  • Equation 5 an arithmetic expression for deriving ⁇ a from the area difference Sa ⁇ Sb can be obtained.
  • phase difference ⁇ a from the zero cross to the first integration range can be calculated by the area difference Sa ⁇ Sb. That is, the position of the zero cross can be uniquely determined based on the starting point of the first integration range.
  • the values set in the instruction unit 170 include the integration range ⁇ of ⁇ / 4, the number of integrations of 4, the operation timing of ⁇ / 4 intervals, and the recording unit 150 having an AC signal of ⁇ / 4.
  • Four integral values corresponding to are continuously recorded.
  • the range where S2 is maximum coincides with the range where ⁇ 1 is 0 ⁇ ⁇ 1 ⁇ ⁇ / 4.
  • ⁇ 1 is set to ⁇ a in Equation 5
  • S1 and S3 which are integral values having a phase difference of ⁇ / 2 in Sa and Sb
  • ⁇ are set to ⁇ . May correspond to ⁇ / 4. Therefore, an arithmetic expression related to the phase difference ⁇ 1 from the zero cross to the measurement start point is expressed by the following formula 6.
  • Equation 5 is applied in the range of 0 ⁇ ⁇ 4 ⁇ ⁇ / 4. can do. Therefore, ⁇ 4, S4, and S2 may be associated with ⁇ a, Sa, and Sb in Formula 5, and ⁇ / 4 may be associated with ⁇ . Therefore, a mathematical expression such as Equation 7 is established.
  • Equation 9 a mathematical expression such as Equation 9 can be obtained.
  • the zero cross is detected by judging the magnitude relationship between the integral values S1 to S4 or S1 ′ to S4 ′ (the target zero cross).
  • the phase difference from the measurement start point to the measurement start point can be calculated).
  • Equation 6 When the integral value having the maximum value is determined as S2 ′, Equation 6 is When the integral value having the maximum value is determined as S3 ′, Equation 12 is When it is determined that the integral value having the maximum value is S4 ′, the position of the zero cross is calculated by calculation using Equation 10.
  • the measurement value calculation unit 180 calculates an average value or an effective value of the AC signal input to the input unit 110 based on the integrated value recorded in the recording unit 150. For example, when the AC signal is a current, the average value Iave of the AC current is calculated by the following formula.
  • the integration value calculation unit 140 can also calculate S5 ′ based on the additional integration range continuous from S1 ′ to S4 ′ described above and record it in the recording unit 150.
  • S5 ′ is an integral value corresponding to n ⁇ of the AC signal, and n is an arbitrary number of 1 or more.
  • n is an integer of 1 or more from the viewpoint of improving resolution, such as calculation of an average value, and the period of S5 ′ is preferably equal to or longer than S1 ′ to S4 ′. If n is an odd number, the period from S1 ′ to S5 ′ is a multiple of 2 ⁇ , which is suitable for managing the timing of the instruction unit 170.
  • n 1.
  • To S5 ′ is a value for converting to the average current value.
  • the measurement value calculation unit 180 may be configured to calculate Irms as a calculation result based on the above-described formula for calculating the execution value Irms of the current value.
  • the zero-cross detection unit 160 may be configured to output a result according to an arbitrary condition such as an average value, a minimum value, a maximum value, or the like, using a plurality of zero-cross position calculation results.
  • the measurement value calculation unit 180 is configured to output a result based on an arbitrary condition such as an average value, a minimum value, a maximum value, or the like, from a plurality of calculation results for the average value and the execution value of the AC signal. May be.
  • the zero-cross detection unit 160 and the measurement value calculation unit 180 determine that an abnormality such as noise superimposition has occurred, and an error occurs. You may be comprised so that the signal showing a state may be output.
  • FIG. 8 shows an example of S1 to S4 when the integration range ⁇ is ⁇ / 4 ⁇ ⁇ ⁇ / 2.
  • the range ⁇ 1 in which S1, S4, and S3 are maximum coincides with the ranges of ⁇ / 8 ⁇ ⁇ 1 ⁇ 3 ⁇ / 8, 3 ⁇ / 8 ⁇ ⁇ 1 ⁇ 5 ⁇ / 8, and 5 ⁇ / 8 ⁇ ⁇ 1 ⁇ 7 ⁇ / 8, respectively.
  • the mathematical expression is developed in consideration of the phase difference with ⁇ 1, the following approximate expression is obtained.
  • FIG. 9 shows S1 to S4 when the integration range ⁇ is 5 ⁇ / 18, the operation timing is 5 ⁇ / 18, and the phase difference between Sa and Sb is 5 ⁇ / 9.
  • the integration range ⁇ is slightly larger than ⁇ / 4 and the phase difference between Sa and Sb is also larger than ⁇ / 2.
  • Equation 6, Equation 8, Equation 10, Equation 12, etc. By applying the predetermined arithmetic expression as it is, it is possible to roughly calculate ⁇ 1. Under the above conditions, the maximum error is about + 16 °.
  • the zero-cross detection device 1 Since the phase difference up to the start point can be calculated, it is possible to obtain a zero-cross detection device that can detect the position of the zero-cross even if the zero-cross detection operation is performed at an arbitrary timing.
  • the zero-cross detection device 1 according to the first embodiment is configured such that the zero-cross detection unit 160 outputs the detection result of the zero-cross based on the phase difference from the zero-cross to the measurement start point. It is possible to obtain a zero-cross detector that can determine the relative positional relationship between the two.
  • the zero cross detection apparatus 1 of the first embodiment is configured such that the measurement value calculation unit 180 measures the average value or the execution value of the AC signal together with the zero cross detection. Therefore, the zero-cross detection device 1 according to the first embodiment can perform both zero-cross detection and AC signal measurement with a single general-purpose input circuit. Cost reduction can be realized.
  • the zero-cross detection device 1 is configured so that the zero-cross detection unit 160 and the measurement value calculation unit 180 output a result based on the calculated values for a plurality of times, and thus is less susceptible to noise.
  • a zero cross detection device can be obtained.
  • the measurement value calculation unit 180 is configured to output a result based on a plurality of integration values including the added integration range, the resolution of the zero cross position can be improved.
  • the zero-cross detection device 2 is configured such that the zero-cross detection unit 260 can detect the zero-cross position without using an arithmetic expression using the same circuit configuration as that of the first embodiment. Therefore, it is possible to obtain a zero cross detection device that further reduces the calculation cost.
  • a detection method switching unit (not shown) selects a detection method according to necessity by switching to the zero-cross detection unit 160 when detailed zero-cross position detection is necessary, and switching to the zero-cross detection unit 260 otherwise. It becomes possible to do.
  • the zero cross detection unit 160 is configured to detect the zero cross based on the inverse sine function using the area difference as shown in Equation 5, but based on the inverse cosine function using the area difference. It is also possible to configure to detect zero crossing. In that case, the inverse cosine function corresponding to Equation 5 is as shown in Equation 19 below.
  • the zero cross detection unit 160 is configured to detect the zero cross by the arithmetic expression based on Expression 5, but the combination of the integration range, the number of integrations, and the operation timing can be easily changed. You may be comprised so that a zero cross may be detected based on the arithmetic expression transformed into the form which is easy to perform arithmetic. An arithmetic expression corresponding to Equation 5 is shown in Equation 20.
  • the integration range set in advance in the zero-crossing detection unit 160 is configured to be ⁇ / 4, but may be configured to set other values. Even when the range is 0 ⁇ ⁇ / 4, as in the description in FIG. 5, the calculation formula for calculating ⁇ 1 based on Equation 5 is derived by considering the phase difference between the integration ranges.
  • the value of the integration range is preferably a value obtained by dividing the phase difference ⁇ / 2 by an integer so that the integration operation can be carried out continuously (no break in the integration operation occurs).
  • ⁇ / 4 which is the upper limit value of the number 2 that defines the integral range, is particularly suitable.
  • the integration range may partially overlap. Under such conditions, it is only necessary to configure the integral value calculation unit 140 so that the integral values can be calculated in parallel in a range where the integral ranges overlap.
  • the zero-cross detection unit 160 is configured to select the zero-cross detection calculation formula based on the range in which the integral value is maximum, but the zero-cross detection is performed based on the range in which the integral value is minimum. It may be configured to select an arithmetic expression. In the first embodiment, the zero-cross detection unit 160 is configured to select an arithmetic expression for zero-cross detection based on a range in which the integral value is maximum. However, an area difference of a combination necessary for the calculation is calculated in advance. In addition, the calculation formula for zero cross detection may be selected using the maximum or minimum area difference.
  • the zero-cross detection unit 160 may be configured to select an arithmetic expression based on the integral value or the size of the area difference.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Measuring Phase Differences (AREA)

Abstract

Cette invention concerne une unité de calcul d'intégrales 140 qui calcule les intégrales d'un signal de courant alternatif, et enregistre les quatre intégrales S1' à S4' dans une unité d'enregistrement 150. Une unité de détection de passage par zéro 160 détermine la valeur maximale desdites S1' à S4', et détecte les passages par zéro du signal de courant alternatif par une expression arithmétique correspondant au résultat de la détermination. Il est, par conséquent, possible de pourvoir à un dispositif de détection de passage par zéro 1 qui utilise un circuit d'entrée universel, est moins susceptible d'être affecté par le bruit et peut être utilisé à d'autres fins. De plus, une unité de calcul de valeur de mesure 180 calcule une valeur moyenne ou une valeur efficace du signal de courant alternatif sur la base des intégrales enregistrées dans l'unité d'enregistrement 150. Par conséquent, la détection du passage par zéro et le calcul d'une valeur moyenne ou d'une valeur efficace du signal de courant alternatif peuvent être effectués simultanément.
PCT/JP2017/031754 2017-02-09 2017-09-04 Dispositif et procédé de détection de passage par zéro Ceased WO2018146844A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2018566744A JP6792177B2 (ja) 2017-02-09 2017-09-04 ゼロクロス検出装置及びゼロクロス検出方法
CN201780083075.2A CN110192113B (zh) 2017-02-09 2017-09-04 过零检测装置以及过零检测方法

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PCT/JP2017/004724 WO2018146767A1 (fr) 2017-02-09 2017-02-09 Dispositif de détection de passage par zéro
JPPCT/JP2017/004724 2017-02-09

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CN113203891B (zh) * 2021-06-04 2022-11-25 无锡和晶智能科技有限公司 用于冰箱控制器双过零点的检测装置和方法

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JPS59200521A (ja) * 1983-04-27 1984-11-13 Yaskawa Electric Mfg Co Ltd 正弦波信号の零交差点検出方法
JPH05322941A (ja) * 1992-05-20 1993-12-07 Mitsubishi Electric Corp 交流計測装置の調整方法
JPH07509051A (ja) * 1991-12-13 1995-10-05 ザ、ダウ、ケミカル、カンパニー 高速電力解析装置
JPH1010163A (ja) * 1996-06-20 1998-01-16 Yokogawa Electric Corp 実効値電圧測定装置
JP2006258698A (ja) * 2005-03-18 2006-09-28 Yokogawa Electric Corp ゼロクロス検出回路
JP2007232571A (ja) * 2006-03-01 2007-09-13 Hioki Ee Corp 電圧等の実効値演算回路および測定器
JP2012154764A (ja) * 2011-01-26 2012-08-16 Hioki Ee Corp 測定装置および測定方法

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SE516437C2 (sv) * 2000-06-07 2002-01-15 Abb Ab Förfarande, anordning, apparat och användning, dataprogram med dataprodukt för prediktering av en nollgenomgång hos en växelström
CN102645576B (zh) * 2012-05-17 2014-11-12 合肥工业大学 一种电感电流过零点的检测装置与检测方法
JP6057876B2 (ja) * 2013-11-18 2017-01-11 東芝三菱電機産業システム株式会社 電力変換装置
JP6173234B2 (ja) * 2014-02-19 2017-08-02 株式会社日立製作所 電源装置および並列型の電源システム
CN105116218B (zh) * 2015-07-15 2018-11-02 厦门大学 基于输入观测器理论的电力线路电流谐波检测方法
CN204964613U (zh) * 2015-09-06 2016-01-13 艾德克斯电子（南京）有限公司 一种过零检测电路

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59200521A (ja) * 1983-04-27 1984-11-13 Yaskawa Electric Mfg Co Ltd 正弦波信号の零交差点検出方法
JPH07509051A (ja) * 1991-12-13 1995-10-05 ザ、ダウ、ケミカル、カンパニー 高速電力解析装置
JPH05322941A (ja) * 1992-05-20 1993-12-07 Mitsubishi Electric Corp 交流計測装置の調整方法
JPH1010163A (ja) * 1996-06-20 1998-01-16 Yokogawa Electric Corp 実効値電圧測定装置
JP2006258698A (ja) * 2005-03-18 2006-09-28 Yokogawa Electric Corp ゼロクロス検出回路
JP2007232571A (ja) * 2006-03-01 2007-09-13 Hioki Ee Corp 電圧等の実効値演算回路および測定器
JP2012154764A (ja) * 2011-01-26 2012-08-16 Hioki Ee Corp 測定装置および測定方法

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JP6792177B2 (ja) 2020-11-25
WO2018146767A1 (fr) 2018-08-16
CN110192113B (zh) 2021-03-12
JPWO2018146844A1 (ja) 2019-11-07
CN110192113A (zh) 2019-08-30

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