KR890010570A - Power factor measurement circuit and method of digital integrated power meter - Google Patents

Power factor measurement circuit and method of digital integrated power meter Download PDF

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Publication number
KR890010570A
KR890010570A KR1019870015297A KR870015297A KR890010570A KR 890010570 A KR890010570 A KR 890010570A KR 1019870015297 A KR1019870015297 A KR 1019870015297A KR 870015297 A KR870015297 A KR 870015297A KR 890010570 A KR890010570 A KR 890010570A
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KR
South Korea
Prior art keywords
voltage
power
signal
input
resistor
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KR1019870015297A
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Korean (ko)
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KR900008302B1 (en
Inventor
김홍명
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안시환
삼성전자 주식회사
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Priority to KR1019870015297A priority Critical patent/KR900008302B1/en
Publication of KR890010570A publication Critical patent/KR890010570A/en
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Publication of KR900008302B1 publication Critical patent/KR900008302B1/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00Arrangements for measuring electric power or power factor

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

내용 없음No content

Description

디지탈 적산 전력계의 역률 측정회로 및 방법Power factor measurement circuit and method of digital integrated power meter

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명의 블록도.2 is a block diagram of the present invention.

제3도는 본 발명의 회로도,3 is a circuit diagram of the present invention,

제4도는 본 발명의 흐름도.4 is a flow chart of the present invention.

Claims (3)

디지탈 적산 절력계의 역률측정회로에 있어서 비반적 입력단(+)이 각각 저항(R3) 및 저항 (R4)를 통해 접지된 복수의 비교기(OP1) 및 (OP2)로 구성되고 상기 비교기(OP1)의 반전입력단(-)에는 전압파형신호를 입력하는 한편 다른 비교기(OP2)의 반전입력단(-)에는 전압X전류의 파형에 해당하는 신호를 입력함으로써 상기 입력된 전압과 전압X전류 파형의 제로 전위시점을 검출하는 제로전위 검출부(10)와, 상기 전압X전류 신호를 저항(R5)를 통해 반전단자로 입력함과 동시에 비반전단자는 저항(R8)을 통해 접지된 연산증폭기(OP3)와 상기 연산 증폭기(OP3)의 출력을 저항(R9)를 통해 반전입력단에 입력함과 동시에 비반전 단자는 저항(R11)을 통해 접지한 연산증폭기(OP4)등으로 구성되어 전압 X전류신호의 레벨을 소정의 양(+) 값으로 변환시켜 출력하는 전압변환부(40)와, 상기 전압변환부(40)의 아날로그 출력을 디지탈 값으로 변환시키는 A/D변환기(30)와, 마이콤(IC2) 및 기능선택스위치(SW)를 구비하여 상기 검출된 제로 전위시점으로부터 위상차각을 계산하여 상기 위치의 기능선택에 대응하는 소정의 역률 및 무효전력량을 측정하기 위한 처리과정을 수행토록 제어하는 마이콤연산부920)로 구성됨을 특징으로 하는 역률측정회로.In the power factor measurement circuit of a digital integrated thyrometer, the inverse input terminal (+) is composed of a plurality of comparators (OP1) and (OP2) grounded through a resistor (R3) and a resistor (R4), respectively. A voltage waveform signal is input to the inverting input terminal (-), while a signal corresponding to the waveform of voltage X current is input to the inverting input terminal (-) of the other comparator OP2, so that the zero potential time point of the input voltage and the voltage X current waveform is input. The zero potential detection unit 10 for detecting the signal and the voltage X current signal is input to the inverting terminal through the resistor R5 and at the same time the non-inverting terminal is grounded with the operational amplifier OP3 grounded through the resistor R8. The output of the amplifier OP3 is input to the inverting input terminal through the resistor R9, and the non-inverting terminal is composed of an operational amplifier OP4 grounded through the resistor R11 to set the level of the voltage X current signal. A voltage converting unit 40 converting the positive value into a positive value and outputting the converted voltage; A / D converter 30 for converting the analog output of the voltage converter 40 into a digital value and a microcomputer IC2 and a function selection switch SW are used to calculate the phase difference from the detected zero potential time point. And a microcomputer operator 920 for controlling a process for measuring a predetermined power factor and reactive power corresponding to the function selection of the position. 디지탈 적산절력계의 역률 측정방법에 있어서, 기능선택 스위치(SW)의 설정상태에 대응하여 유효전력 또는 뮤효전력의 측정을 위한 각각의 처리과정이 선택되는 과정과 마이콤의 입력포트(P1) 및 (P2)를 통해 전압 및 전력신호의 파형이 모두 제로크로싱점이 되는 시점(t0)을 판정하는 과정과, 상기 제로크로싱 시점(t0)으로부터 상기 전력신호의 다음 제로크로 싱점(t1)까지 소정의 샘플링주기로써 샘플링신호의 갯수를 누산하여 이를 N1값으로 함과 동시에 동제 로크로싱시점(t0)으로부터 상기 전압신호와 전력신호가 동시에 제로크로싱되는 다음번 제로크로싱점(t2)까지 상기 샘플링 주기로써 샘플링 신호의 갯수를 누산하여 이를 N값으로 하는 과정과, 상기 N1 및 N값으로부터 소정의 위상차각(α) 과정과 상기 위상차각의 값으로부터 소정의 선택된 무효전력 또는 유효전력과 역률을 구하는 과정으로 이루어짐을 특징으로 하는 역률측정방법.In the method of measuring the power factor of a digital integrated power meter, a process of selecting respective processes for measuring active power or reactive power in response to a setting state of a function selection switch SW, and input ports P1 and ( Determining a time point t0 at which both the waveform of the voltage and the power signal become the zero crossing point through P2), and a predetermined sampling period from the zero crossing time point t0 to the next zero crossing point t1 of the power signal. By accumulating the number of sampling signals and setting them as N1 values, the number of sampling signals as the sampling period from the time of the cross lock time t0 to the next zero crossing point t2 where the voltage signal and the power signal are zero-crossed simultaneously. And accumulate? To make it a value of N; Or a process for determining the effective power and power factor. 제2항에 있어서, 상기 위상차각(α) 및 역률이 상기 샘플링 갯수의 누산된 값 N1 및 N으로 부터하기의 식을 적용함으로써 구해짐을 특징으로 하는 역률측정방법.The power factor measurement method according to claim 2, wherein the phase difference angle α and the power factor are obtained by applying the following equation from the accumulated values N1 and N of the sampling number. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019870015297A 1987-12-30 1987-12-30 Power factor measuring circuit and method of power meter KR900008302B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019870015297A KR900008302B1 (en) 1987-12-30 1987-12-30 Power factor measuring circuit and method of power meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019870015297A KR900008302B1 (en) 1987-12-30 1987-12-30 Power factor measuring circuit and method of power meter

Publications (2)

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KR890010570A true KR890010570A (en) 1989-08-09
KR900008302B1 KR900008302B1 (en) 1990-11-12

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KR1019870015297A KR900008302B1 (en) 1987-12-30 1987-12-30 Power factor measuring circuit and method of power meter

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100813808B1 (en) * 2006-11-16 2008-03-13 엘에스산전 주식회사 Current measurement circuit with improved resolution and controlling method thereof and digital protection relay of using the same
KR100861499B1 (en) * 2007-06-08 2008-10-02 서울마린 (주) Generation efficiency measuring apparatus of electric power of solar photovoltaic generator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3823972B2 (en) 2003-05-09 2006-09-20 セイコーエプソン株式会社 Viewing angle control element, display device, and electronic device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100813808B1 (en) * 2006-11-16 2008-03-13 엘에스산전 주식회사 Current measurement circuit with improved resolution and controlling method thereof and digital protection relay of using the same
KR100861499B1 (en) * 2007-06-08 2008-10-02 서울마린 (주) Generation efficiency measuring apparatus of electric power of solar photovoltaic generator

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KR900008302B1 (en) 1990-11-12

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