JP2005241305A - Phase adjustment circuit of watthour meter - Google Patents

Phase adjustment circuit of watthour meter Download PDF

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JP2005241305A
JP2005241305A JP2004048632A JP2004048632A JP2005241305A JP 2005241305 A JP2005241305 A JP 2005241305A JP 2004048632 A JP2004048632 A JP 2004048632A JP 2004048632 A JP2004048632 A JP 2004048632A JP 2005241305 A JP2005241305 A JP 2005241305A
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detection signal
resistor
operational amplifier
adjustment circuit
phase
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Eiji Iwami
英司 岩見
Hiroaki Yuasa
裕明 湯浅
Kazunori Hirooka
一紀 廣岡
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a phase adjustment circuit of watthour meters capable of maintaining a constant gain regardless of the adjustment of the amount of phase correction. <P>SOLUTION: The phase adjustment circuit 3a is constituted of an operational amplifier OP1; a resistor R1 connected between a noninverting input terminal of the operational amplifier OP1 and a ground level; a capacitor C1 having one end connected to the noninverting input terminal of the operational amplifier OP1; a resistor R2 connected between the noninverting input terminal of the operational amplifier OP1 and the other end of the capacitor C1; and a resistor R3 connected between an output terminal and the noninverting input terminal of the operational amplifier OP1. By adjusting each value of the capacitor C1 and the resistor R1, the amount of a phase advance (amount of phase adjustment) of a voltage detection signal V3a to a voltage detection signal V1 is adjusted. By adjusting each value of the resistor R2 and the resistor R3, a gain (V3a/V1) of the operational amplifier OP1 is adjusted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、変流器を用いて電流を検出する電力量計の位相調整回路に関するものである。   The present invention relates to a phase adjustment circuit for a watt-hour meter that detects current using a current transformer.

図２は入力電圧Ｖｉｎと入力電流Ｉｉｎとから電力量を計測する電力量計が具備する電力量演算機能のブロック回路を示しており、入力電圧Ｖｉｎを検出して電圧検出信号Ｖ１を出力する電圧検出部１と、入力電流Ｉｉｎを検出して電流検出信号Ｖ２を出力する変流器２と、電圧検出信号Ｖ１の位相を調整した電圧検出信号Ｖ３ａを出力する位相調整回路３ａと、電圧検出信号Ｖ３ａをＡ／Ｄ変換したデジタル電圧信号Ｖ４を出力する電圧Ａ／Ｄ変換部４と、電流検出信号Ｖ２をＡ／Ｄ変換したデジタル電流信号Ｖ５を出力する電流Ａ／Ｄ変換部５と、デジタル電圧信号Ｖ４とデジタル電流信号Ｖ５とを乗算して電力量を演算し、電力量信号Ｗを出力する掛算回路６とを備える。   FIG. 2 shows a block circuit of a power amount calculation function provided in a watt hour meter that measures the amount of power from the input voltage Vin and the input current Iin. The voltage that detects the input voltage Vin and outputs the voltage detection signal V1. A detector 1; a current transformer 2 that detects an input current Iin and outputs a current detection signal V2; a phase adjustment circuit 3a that outputs a voltage detection signal V3a in which the phase of the voltage detection signal V1 is adjusted; and a voltage detection signal A voltage A / D converter 4 that outputs a digital voltage signal V4 obtained by A / D converting V3a, a current A / D converter 5 that outputs a digital current signal V5 obtained by A / D converting the current detection signal V2, and a digital signal A multiplication circuit 6 that multiplies the voltage signal V4 and the digital current signal V5 to calculate an electric energy and outputs an electric energy signal W is provided.

ここで、電圧検出部１は入力電圧Ｖｉｎと同位相の電圧検出信号Ｖ１を出力し、変流器２は入力電流Ｉｉｎに対して進み位相となる電流検出信号Ｖ２を出力するため、電圧検出信号Ｖ１と電流検出信号Ｖ２との位相差と、入力電圧Ｖｉｎと入力電流Ｉｉｎとの位相差とは互いに異なり、電圧検出信号Ｖ１と電流検出信号Ｖ２とを乗算して求めた電力量には実際の電力量に対して誤差が生じる。そこで、位相調整回路３ａによって、電圧検出信号Ｖ１に対する電圧検出信号Ｖ３ａの位相進み量（位相補正量）が入力電流Ｉｉｎに対する電流検出信号Ｖ２の位相進み量と等しくなるように、電圧検出信号Ｖ１に対して位相補正を行うことで、電圧検出信号Ｖ３ａと電流検出信号Ｖ２との位相差を、入力電圧Ｖｉｎと入力電流Ｉｉｎとの位相差に等しくして、電流検出信号Ｖ２の進み位相によって電力量信号Ｗに生じる誤差をゼロにしている。   Here, the voltage detection unit 1 outputs a voltage detection signal V1 having the same phase as the input voltage Vin, and the current transformer 2 outputs a current detection signal V2 having a leading phase with respect to the input current Iin. The phase difference between V1 and the current detection signal V2 and the phase difference between the input voltage Vin and the input current Iin are different from each other, and the amount of power obtained by multiplying the voltage detection signal V1 and the current detection signal V2 is an actual amount of power. An error occurs with respect to the electric energy. Therefore, the phase adjustment circuit 3a sets the voltage detection signal V1 so that the phase advance amount (phase correction amount) of the voltage detection signal V3a with respect to the voltage detection signal V1 is equal to the phase advance amount of the current detection signal V2 with respect to the input current Iin. By performing phase correction for the current detection signal V2, the phase difference between the voltage detection signal V3a and the current detection signal V2 is made equal to the phase difference between the input voltage Vin and the input current Iin. The error generated in the signal W is set to zero.

従来、位相調整回路３ａは図７に示すように、電圧検出部１の出力に一端を接続した抵抗Ｒ１０と、抵抗Ｒ１０の他端−グランドレベル間に接続した可変抵抗Ｒａと、抵抗Ｒ１０の他端−可変抵抗Ｒａの可変端子（摺動子）間に接続したコンデンサＣ１０とから構成され、抵抗Ｒ１０の一端に電圧検出信号Ｖ１を入力して、抵抗Ｒ１０とコンデンサＣ１０との接続点から位相を調整した電圧検出信号Ｖ３ａを出力する。そして、可変抵抗Ｒａの摺動子を操作して抵抗比Ｒ１１／Ｒ１２を可変とすることで、位相補正量を調整する。（例えば、特許文献１参照）。   Conventionally, as shown in FIG. 7, the phase adjustment circuit 3a includes a resistor R10 having one end connected to the output of the voltage detection unit 1, a variable resistor Ra connected between the other end of the resistor R10 and the ground level, and a resistor R10. The capacitor C10 is connected between the end and the variable terminal (slider) of the variable resistor Ra. The voltage detection signal V1 is input to one end of the resistor R10, and the phase is determined from the connection point between the resistor R10 and the capacitor C10. The adjusted voltage detection signal V3a is output. Then, the phase correction amount is adjusted by operating the slider of the variable resistor Ra to change the resistance ratio R11 / R12. (For example, refer to Patent Document 1).

また、位相調整回路３ａの別の構成として、図８に示すように、電圧検出部１の出力に一端を接続した抵抗Ｒ１０と、抵抗Ｒ１０の他端−グランドレベル間に接続したコンデンサＣ１０とからなるものもあり、抵抗Ｒ１０の一端に電圧検出信号Ｖ１を入力して、抵抗Ｒ１０とコンデンサＣ１０との接続点から位相を調整した電圧検出信号Ｖ３ａを出力する。この場合は、抵抗Ｒ１０とコンデンサＣ１０の各値を予め設定しておくことで、位相補正量を予め調整している。
特開平５−１２６８７３号公報（段落番号［００１０］、［００１１］、図１，図２） As another configuration of the phase adjustment circuit 3a, as shown in FIG. 8, a resistor R10 having one end connected to the output of the voltage detection unit 1 and a capacitor C10 connected between the other end of the resistor R10 and the ground level are used. The voltage detection signal V1 is input to one end of the resistor R10, and the voltage detection signal V3a whose phase is adjusted from the connection point between the resistor R10 and the capacitor C10 is output. In this case, the phase correction amount is adjusted in advance by setting each value of the resistor R10 and the capacitor C10 in advance.
JP-A-5-126873 (paragraph numbers [0010], [0011], FIGS. 1 and 2)

図７に回路構成を示す位相調整回路３ａは、［数１］に示されるように、位相補正量を調整するために抵抗Ｒ１０〜Ｒ１２、コンデンサＣ１０の各値が変化すると、ゲイン（Ｖ３ａ／Ｖ１）も変化するので、ゲイン補正手段が別途必要であった。なお、電源角周波数ωとしている。   As shown in [Equation 1], the phase adjustment circuit 3a whose circuit configuration is shown in FIG. 7 changes the gain (V3a / V1) when the values of the resistors R10 to R12 and the capacitor C10 change in order to adjust the phase correction amount. ) Also changes, and a separate gain correction means is necessary. The power supply angular frequency ω is used.

Figure 2005241305
Figure 2005241305

また、図８に回路構成を示す位相調整回路３ａも、［数２］に示されるように、位相補正量を調整するために抵抗Ｒ１０、コンデンサＣ１０の各値が変化すると、ゲイン（Ｖ３ａ／Ｖ１）も変化するので、ゲイン補正手段が別途必要であった。   Further, the phase adjustment circuit 3a having the circuit configuration shown in FIG. 8 also has a gain (V3a / V1) when the values of the resistor R10 and the capacitor C10 change in order to adjust the phase correction amount as shown in [Formula 2]. ) Also changes, and a separate gain correction means is necessary.

Figure 2005241305
Figure 2005241305

本発明は、上記事由に鑑みてなされたものであり、その目的は、位相補正量の調整とは関係なく、ゲインを一定にできる電力量計の位相調整回路を提供することにある。   The present invention has been made in view of the above reasons, and an object of the present invention is to provide a phase adjustment circuit of a watt-hour meter capable of making the gain constant regardless of the adjustment of the phase correction amount.

請求項１の発明は、電圧の検出信号と変流器を用いて検出した電流の検出信号とに基づいて電力量を計測する電力量計の位相調整回路において、オペアンプと、前記オペアンプの非反転入力端子とグランドレベル間に接続した抵抗と、前記オペアンプの非反転入力端子に一端を接続したコンデンサとを備え、前記コンデンサの他端に電圧の検出信号を入力し、前記オペアンプのゲインを負帰還によって所定値に設定したことを特徴とする。   According to a first aspect of the present invention, there is provided an energy meter phase adjustment circuit for measuring an electric energy based on a voltage detection signal and an electric current detection signal detected by using a current transformer. A resistor connected between the input terminal and the ground level, and a capacitor having one end connected to the non-inverting input terminal of the operational amplifier, a voltage detection signal is input to the other end of the capacitor, and the gain of the operational amplifier is negatively fed back Is set to a predetermined value.

この発明によれば、オペアンプの非反転入力端子に接続したコンデンサと抵抗の各値を調整することで、位相調整回路のゲインが変化することなく、入力された電圧検出信号に対して位相進み量（位相補正量）を調整でき、ゲイン一定で変流器の位相差特性を補正して電力量計の計測精度を向上させることができる。   According to the present invention, by adjusting each value of the capacitor and the resistor connected to the non-inverting input terminal of the operational amplifier, the phase advance amount with respect to the input voltage detection signal without changing the gain of the phase adjustment circuit. The (phase correction amount) can be adjusted, and the measurement accuracy of the watt-hour meter can be improved by correcting the phase difference characteristic of the current transformer with a constant gain.

請求項２の発明は、電圧の検出信号と変流器を用いて検出した電流の検出信号とに基づいて電力量を計測する電力量計の位相調整回路において、オペアンプと、前記オペアンプの非反転入力端子とグランドレベル間に接続したコンデンサと、前記オペアンプの非反転入力端子に一端を接続した抵抗とを備え、前記抵抗の他端に前記変流器が出力する電流の検出信号を入力し、前記オペアンプのゲインを負帰還によって所定値に設定したことを特徴とする。   According to a second aspect of the present invention, there is provided an energy meter phase adjustment circuit for measuring an electric energy based on a voltage detection signal and an electric current detection signal detected by using a current transformer. A capacitor connected between the input terminal and the ground level, and a resistor having one end connected to the non-inverting input terminal of the operational amplifier, and a current detection signal output from the current transformer is input to the other end of the resistor, The gain of the operational amplifier is set to a predetermined value by negative feedback.

この発明によれば、オペアンプの非反転入力端子に接続したコンデンサと抵抗の各値を調整することで、位相調整回路のゲインが変化することなく、入力された電流検出信号に対して位相遅れ量（位相補正量）を調整でき、ゲイン一定で変流器の位相差特性を補正して電力量計の計測精度を向上させることができる。   According to the present invention, by adjusting each value of the capacitor and the resistor connected to the non-inverting input terminal of the operational amplifier, the phase delay amount with respect to the input current detection signal without changing the gain of the phase adjustment circuit The (phase correction amount) can be adjusted, and the measurement accuracy of the watt-hour meter can be improved by correcting the phase difference characteristic of the current transformer with a constant gain.

請求項３の発明は、請求項１または２において、前記抵抗は並列接続された複数の抵抗素子からなり、各抵抗素子に直列にスイッチを接続して、各スイッチのオン・オフ状態を切り換えることで前記抵抗の値を切り換えることを特徴とする。   According to a third aspect of the present invention, in the first or second aspect, the resistor includes a plurality of resistance elements connected in parallel, and a switch is connected in series to each resistance element to switch the on / off state of each switch. The value of the resistor is switched by the above.

この発明によれば、各スイッチのオン・オフ状態を切り換えることで位相補正量を可変とすることができ、特性が異なる複数の変流器に容易に対応することができる。さらに、スイッチによって抵抗値を切り換える構成のほうが、従来のように可変抵抗の摺動子を操作して抵抗値を調整する構成より、温度特性、耐振動性の点で優れている。   According to the present invention, the phase correction amount can be made variable by switching the on / off state of each switch, and it is possible to easily cope with a plurality of current transformers having different characteristics. Furthermore, the configuration in which the resistance value is switched by a switch is superior in terms of temperature characteristics and vibration resistance, compared to the conventional configuration in which the resistance value is adjusted by operating a variable resistance slider.

以上説明したように、本発明では、オペアンプの非反転入力端子に接続したコンデンサと抵抗の各値を調整することで位相補正量を調整でき、さらにこの位相補正量の調整とは関係なく、ゲインを一定にできるという効果がある。   As described above, in the present invention, the phase correction amount can be adjusted by adjusting each value of the capacitor and the resistor connected to the non-inverting input terminal of the operational amplifier, and the gain is not related to the adjustment of the phase correction amount. There is an effect that can be made constant.

以下、本発明の実施の形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（実施形態１）
図２は入力電圧Ｖｉｎと入力電流Ｉｉｎとから電力量を計測する電力量計が具備する電力量演算機能のブロック構成を示しており、入力電圧Ｖｉｎを検出して電圧検出信号Ｖ１を出力する電圧検出部１と、入力電流Ｉｉｎを検出して電流検出信号Ｖ２を出力する変流器２と、電圧検出信号Ｖ１の位相を調整した電圧検出信号Ｖ３ａを出力する位相調整回路３ａと、電圧検出信号Ｖ３ａをＡ／Ｄ変換したデジタル電圧信号Ｖ４を出力する電圧Ａ／Ｄ変換部４と、電流検出信号Ｖ２をＡ／Ｄ変換したデジタル電流信号Ｖ５を出力する電流Ａ／Ｄ変換部５と、デジタル電圧信号Ｖ４とデジタル電流信号Ｖ５とを乗算して電力量を演算し、電力量信号Ｗを出力する掛算回路６とを備える。 (Embodiment 1)
FIG. 2 shows a block configuration of a power amount calculation function provided in a watt hour meter that measures a power amount from an input voltage Vin and an input current Iin, and a voltage for detecting the input voltage Vin and outputting a voltage detection signal V1 A detector 1; a current transformer 2 that detects an input current Iin and outputs a current detection signal V2; a phase adjustment circuit 3a that outputs a voltage detection signal V3a in which the phase of the voltage detection signal V1 is adjusted; and a voltage detection signal A voltage A / D converter 4 that outputs a digital voltage signal V4 obtained by A / D converting V3a, a current A / D converter 5 that outputs a digital current signal V5 obtained by A / D converting the current detection signal V2, and a digital signal A multiplication circuit 6 that multiplies the voltage signal V4 and the digital current signal V5 to calculate an electric energy and outputs an electric energy signal W is provided.

位相調整回路３ａは図１に示すように、オペアンプＯＰ１と、オペアンプＯＰ１の非反転入力端子−グランドレベル間に接続した抵抗Ｒ１と、オペアンプＯＰ１の非反転入力端子に一端を接続したコンデンサＣ１と、オペアンプＯＰ１の反転入力端子−コンデンサＣ１の他端間に接続した抵抗Ｒ２と、オペアンプＯＰ１の出力端子−反転入力端子間に接続した抵抗Ｒ３から構成され、コンデンサＣ１の他端に電圧検出信号Ｖ１を入力して、オペアンプＯＰ１の出力端子から位相を調整した電圧検出信号Ｖ３ａを出力する。このような位相調整回路３ａでは、コンデンサＣ１と抵抗Ｒ１の各値を調整することで、電圧検出信号Ｖ１に対する電圧検出信号Ｖ３ａの位相進み量（位相補正量）を調整する。   As shown in FIG. 1, the phase adjustment circuit 3a includes an operational amplifier OP1, a resistor R1 connected between the non-inverting input terminal of the operational amplifier OP1 and the ground level, a capacitor C1 having one end connected to the non-inverting input terminal of the operational amplifier OP1, The resistor R2 is connected between the inverting input terminal of the operational amplifier OP1 and the other end of the capacitor C1, and the resistor R3 is connected between the output terminal of the operational amplifier OP1 and the inverting input terminal. The voltage detection signal V1 is applied to the other end of the capacitor C1. The voltage detection signal V3a whose phase is adjusted is output from the output terminal of the operational amplifier OP1. In such a phase adjustment circuit 3a, the phase advance amount (phase correction amount) of the voltage detection signal V3a with respect to the voltage detection signal V1 is adjusted by adjusting the values of the capacitor C1 and the resistor R1.

そして、電圧検出部１は入力電圧Ｖｉｎと同位相の電圧検出信号Ｖ１を出力し、変流器２は入力電流Ｉｉｎに対して進み位相となる電流検出信号Ｖ２を出力するが、電圧検出信号Ｖ１に対する電圧検出信号Ｖ３ａの位相進み量が入力電流Ｉｉｎに対する電流検出信号Ｖ２の位相進み量と等しくなるように、位相調整回路３ａのコンデンサＣ１と抵抗Ｒ１の各値を調整して電圧検出信号Ｖ１に対して位相補正を行うことで、電圧検出信号Ｖ３ａと電流検出信号Ｖ２との位相差を、入力電圧Ｖｉｎと入力電流Ｉｉｎとの位相差に等しくする。したがって、電圧検出信号Ｖ３ａ及び電流検出信号Ｖ２を各々Ａ／Ｄ変換したデジタル電圧信号Ｖ４及びデジタル電流信号Ｖ５を乗算して求めた電力量信号Ｗは、電流検出信号Ｖ２の進み位相によって生じる誤差がゼロとなる。   The voltage detection unit 1 outputs a voltage detection signal V1 having the same phase as the input voltage Vin, and the current transformer 2 outputs a current detection signal V2 having a leading phase with respect to the input current Iin, but the voltage detection signal V1. Each value of the capacitor C1 and the resistor R1 of the phase adjustment circuit 3a is adjusted so that the phase advance amount of the voltage detection signal V3a with respect to the input current Iin becomes equal to the phase advance amount of the current detection signal V2 with respect to the input current Iin. By performing phase correction for the voltage, the phase difference between the voltage detection signal V3a and the current detection signal V2 is made equal to the phase difference between the input voltage Vin and the input current Iin. Therefore, the power amount signal W obtained by multiplying the digital voltage signal V4 and the digital current signal V5 obtained by A / D converting the voltage detection signal V3a and the current detection signal V2 respectively has an error caused by the leading phase of the current detection signal V2. It becomes zero.

さらに、オペアンプＯＰ１のゲイン（Ｖ３ａ／Ｖ１）は抵抗Ｒ２と抵抗Ｒ３とで設定されて、コンデンサＣ１と抵抗Ｒ１とで設定される位相補正量の調整とは関係なく一定となる。このとき、抵抗Ｒ２と抵抗Ｒ３の各値を同一とすればオペアンプＯＰ１のゲインは１倍となる。   Further, the gain (V3a / V1) of the operational amplifier OP1 is set by the resistor R2 and the resistor R3, and is constant regardless of the adjustment of the phase correction amount set by the capacitor C1 and the resistor R1. At this time, if the values of the resistor R2 and the resistor R3 are the same, the gain of the operational amplifier OP1 becomes one.

（実施形態２）
本実施形態は、図２に示す電力量演算機能のブロック構成において図３に示す位相調整回路３ａを用いたもので、本実施形態の位相調整回路３ａは、実施形態１で説明した位相調整回路３ａのコンデンサＣ１にスイッチＳＷ１を並列接続したものである。すなわち、スイッチＳＷ１がオンすることでコンデンサＣ１の両端を短絡して位相補正量をゼロとすることができ、位相補正が不要な変流器２にも対応できる。また、スイッチＳＷ１がオフすれば、実施形態１と同様に電圧検出信号Ｖ１に所定の位相補正を行った電圧検出信号Ｖ３ａを出力する。 (Embodiment 2)
This embodiment uses the phase adjustment circuit 3a shown in FIG. 3 in the block configuration of the electric energy calculation function shown in FIG. 2, and the phase adjustment circuit 3a of this embodiment is the phase adjustment circuit described in the first embodiment. The switch SW1 is connected in parallel to the capacitor C1 of 3a. That is, when the switch SW1 is turned on, both ends of the capacitor C1 can be short-circuited to make the phase correction amount zero, and the current transformer 2 that does not require phase correction can be handled. When the switch SW1 is turned off, the voltage detection signal V3a obtained by performing a predetermined phase correction on the voltage detection signal V1 is output as in the first embodiment.

また、本実施形態においても、オペアンプＯＰ１のゲイン（Ｖ３ａ／Ｖ１）は抵抗Ｒ２と抵抗Ｒ３とで設定されて、コンデンサＣ１と抵抗Ｒ１とで設定される位相補正量の調整とは関係なく一定となる。このとき、抵抗Ｒ２と抵抗Ｒ３の各値を同一とすればオペアンプＯＰ１のゲインは１倍となる。。   Also in this embodiment, the gain (V3a / V1) of the operational amplifier OP1 is set by the resistor R2 and the resistor R3, and is constant regardless of the adjustment of the phase correction amount set by the capacitor C1 and the resistor R1. Become. At this time, if the values of the resistor R2 and the resistor R3 are the same, the gain of the operational amplifier OP1 becomes one. .

なお、他の構成は実施形態１と同様であり、実施形態１と同様の構成には同一の符号を付して説明は省略する。   Other configurations are the same as those of the first embodiment, and the same reference numerals are given to the same configurations as those of the first embodiment, and description thereof is omitted.

（実施形態３）
本実施形態は、図２に示す電力量演算機能のブロック構成において図４に示す位相調整回路３ａを用いたもので、本実施形態の位相調整回路３ａは、実施形態１で説明した位相調整回路３ａのオペアンプＯＰ１の非反転入力端子−グランドレベル間に、スイッチＳＷ１１と抵抗Ｒ１ａとの直列回路、スイッチＳＷ１２と抵抗Ｒ１ｂとの直列回路、スイッチＳＷ１３と抵抗Ｒ１ｃとの直列回路が並列接続されている。さらに、スイッチＳＷ１０がコンデンサＣ１に並列接続されている。ここで、スイッチＳＷ１０〜ＳＷ１３はマルチプレクサＭに内蔵されており、マルチプレクサＭへ与える制御信号によってオンさせるスイッチを切り換えることで、オペアンプＯＰ１の非反転入力端子−グランドレベル間に接続される抵抗を切り換えて、位相補正量を可変とすることができ、特性が異なる複数の変流器２にも容易に対応することができる。このときスイッチＳＷ１０をオンさせれば位相補正量はゼロとなる。このように、マルチプレクサＭを用いて抵抗値を切り換える構成のほうが、従来のように可変抵抗の摺動子を操作して抵抗値を調整する構成より、温度特性、耐振動性の点で優れている。 (Embodiment 3)
This embodiment uses the phase adjustment circuit 3a shown in FIG. 4 in the block configuration of the electric energy calculation function shown in FIG. 2, and the phase adjustment circuit 3a of this embodiment is the phase adjustment circuit described in the first embodiment. Between the non-inverting input terminal of the operational amplifier OP1 of 3a and the ground level, a series circuit of the switch SW11 and the resistor R1a, a series circuit of the switch SW12 and the resistor R1b, and a series circuit of the switch SW13 and the resistor R1c are connected in parallel. . Further, the switch SW10 is connected in parallel to the capacitor C1. Here, the switches SW10 to SW13 are built in the multiplexer M, and by switching a switch to be turned on by a control signal given to the multiplexer M, a resistor connected between the non-inverting input terminal of the operational amplifier OP1 and the ground level is switched. The phase correction amount can be made variable, and a plurality of current transformers 2 having different characteristics can be easily handled. At this time, if the switch SW10 is turned on, the phase correction amount becomes zero. Thus, the configuration in which the resistance value is switched using the multiplexer M is superior in terms of temperature characteristics and vibration resistance than the conventional configuration in which the resistance value is adjusted by operating the slider of the variable resistance. Yes.

また、本実施形態においても、オペアンプＯＰ１のゲイン（Ｖ３ａ／Ｖ１）は抵抗Ｒ２と抵抗Ｒ３とで設定されて、位相補正量の調整とは関係なく一定となる。このとき、抵抗Ｒ２と抵抗Ｒ３の各値を同一とすればオペアンプＯＰ１のゲインは１倍となる。   Also in the present embodiment, the gain (V3a / V1) of the operational amplifier OP1 is set by the resistor R2 and the resistor R3, and is constant regardless of the adjustment of the phase correction amount. At this time, if the values of the resistor R2 and the resistor R3 are the same, the gain of the operational amplifier OP1 becomes one.

なお、他の構成は実施形態１と同様であり、実施形態１と同様の構成には同一の符号を付して説明は省略する。   Other configurations are the same as those of the first embodiment, and the same reference numerals are given to the same configurations as those of the first embodiment, and description thereof is omitted.

（実施形態４）
図５は入力電圧Ｖｉｎと入力電流Ｉｉｎとから電力量を計測する電力量計が具備する電力量演算機能のブロック構成を示しており、入力電圧Ｖｉｎを検出して電圧検出信号Ｖ１を出力する電圧検出部１と、入力電流Ｉｉｎを検出して電流検出信号Ｖ２を出力する変流器２と、電流検出信号Ｖ２の位相を調整した電流検出信号Ｖ３ｂを出力する位相調整回路３ｂと、電圧検出信号Ｖ１をＡ／Ｄ変換したデジタル電圧信号Ｖ４を出力する電圧Ａ／Ｄ変換部４と、電流検出信号Ｖ３ｂをＡ／Ｄ変換したデジタル電流信号Ｖ５を出力する電流Ａ／Ｄ変換部５と、デジタル電圧信号Ｖ４とデジタル電流信号Ｖ５とを乗算して電力量を演算し、電力量信号Ｗを出力する掛算回路６とを備える。 (Embodiment 4)
FIG. 5 shows a block configuration of a power amount calculation function provided in a watt hour meter that measures a power amount from the input voltage Vin and the input current Iin. The voltage for detecting the input voltage Vin and outputting the voltage detection signal V1. A detector 1; a current transformer 2 that detects an input current Iin and outputs a current detection signal V2; a phase adjustment circuit 3b that outputs a current detection signal V3b in which the phase of the current detection signal V2 is adjusted; and a voltage detection signal A voltage A / D converter 4 that outputs a digital voltage signal V4 obtained by A / D converting V1, a current A / D converter 5 that outputs a digital current signal V5 obtained by A / D converting the current detection signal V3b, and a digital signal A multiplication circuit 6 that multiplies the voltage signal V4 and the digital current signal V5 to calculate an electric energy and outputs an electric energy signal W is provided.

位相調整回路３ｂは図６に示すように、オペアンプＯＰ１と、オペアンプＯＰ１の非反転入力端子−グランドレベル間に接続したコンデンサＣ１と、オペアンプＯＰ１の非反転入力端子に一端を接続した抵抗Ｒ１と、オペアンプＯＰ１の反転入力端子−抵抗Ｒ１の他端間に接続した抵抗Ｒ２と、オペアンプＯＰ１の出力端子−反転入力端子間に接続した抵抗Ｒ３から構成され、抵抗Ｒ１の他端に電流検出信号Ｖ２を入力して、オペアンプＯＰ１の出力端子から位相を調整した電流検出信号Ｖ３ｂを出力する。このような位相調整回路３ｂでは、コンデンサＣ１と抵抗Ｒ１の各値を調整することで、電流検出信号Ｖ２に対する電流検出信号Ｖ３ｂの位相遅れ量（位相補正量）を調整する。   As shown in FIG. 6, the phase adjustment circuit 3b includes an operational amplifier OP1, a capacitor C1 connected between the non-inverting input terminal of the operational amplifier OP1 and the ground level, a resistor R1 having one end connected to the non-inverting input terminal of the operational amplifier OP1, The resistor R2 is connected between the inverting input terminal of the operational amplifier OP1 and the other end of the resistor R1, and the resistor R3 is connected between the output terminal of the operational amplifier OP1 and the inverting input terminal. The current detection signal V2 is applied to the other end of the resistor R1. The current detection signal V3b whose phase is adjusted is output from the output terminal of the operational amplifier OP1. In such a phase adjustment circuit 3b, the phase delay amount (phase correction amount) of the current detection signal V3b with respect to the current detection signal V2 is adjusted by adjusting each value of the capacitor C1 and the resistor R1.

そして、電圧検出部１は入力電圧Ｖｉｎと同位相の電圧検出信号Ｖ１を出力し、変流器２は入力電流Ｉｉｎに対して進み位相となる電流検出信号Ｖ２を出力するが、電流検出信号Ｖ２に対する電流検出信号Ｖ３ｂの位相遅れ量の絶対値が、入力電流Ｉｉｎに対する電流検出信号Ｖ２の位相進み量の絶対値と等しくなるように、位相調整回路３ｂのコンデンサＣ１と抵抗Ｒ１の各値を調整して電流検出信号Ｖ２に対して位相補正を行うことで、電圧検出信号Ｖ１と電流検出信号Ｖ３ｂとの位相差を、入力電圧Ｖｉｎと入力電流Ｉｉｎとの位相差に等しくする。したがって、電圧検出信号Ｖ１及び電流検出信号Ｖ３ｂを各々Ａ／Ｄ変換したデジタル電圧信号Ｖ４及びデジタル電流信号Ｖ５を乗算して求めた電力量信号Ｗは、電流検出信号Ｖ２の進み位相によって生じる誤差がゼロとなる。   Then, the voltage detection unit 1 outputs a voltage detection signal V1 having the same phase as the input voltage Vin, and the current transformer 2 outputs a current detection signal V2 having a leading phase with respect to the input current Iin, but the current detection signal V2 The values of the capacitor C1 and the resistor R1 of the phase adjustment circuit 3b are adjusted so that the absolute value of the phase lag amount of the current detection signal V3b with respect to the input current Iin is equal to the absolute value of the phase advance amount of the current detection signal V2 with respect to the input current Iin. Thus, by performing phase correction on the current detection signal V2, the phase difference between the voltage detection signal V1 and the current detection signal V3b is made equal to the phase difference between the input voltage Vin and the input current Iin. Therefore, the power amount signal W obtained by multiplying the digital voltage signal V4 and the digital current signal V5 obtained by A / D converting the voltage detection signal V1 and the current detection signal V3b, respectively, has an error caused by the leading phase of the current detection signal V2. It becomes zero.

さらに、オペアンプＯＰ１のゲイン（Ｖ３ｂ／Ｖ２）は抵抗Ｒ２と抵抗Ｒ３とで設定されて、コンデンサＣ１と抵抗Ｒ１とで設定される位相補正量の調整とは関係なく一定となる。このとき、抵抗Ｒ２と抵抗Ｒ３の各値を同一とすればオペアンプＯＰ１のゲインは１倍となる。   Further, the gain (V3b / V2) of the operational amplifier OP1 is set by the resistor R2 and the resistor R3, and is constant regardless of the adjustment of the phase correction amount set by the capacitor C1 and the resistor R1. At this time, if the values of the resistor R2 and the resistor R3 are the same, the gain of the operational amplifier OP1 becomes one.

なお、コンデンサＣ１にスイッチを直列接続してスイッチをオフにすれば、位相補正量をゼロとすることができる。   If the switch is connected in series to the capacitor C1 and the switch is turned off, the phase correction amount can be made zero.

さらには、抵抗Ｒ１の代わりに、電流検出信号Ｖ２入力−オペアンプＯＰ１の非反転入力端子間にマルチプレクサが具備する各スイッチを介して複数の抵抗を各々並列接続すれば、マルチプレクサへ与える制御信号によってオンさせるスイッチを切り換えることで、オペアンプＯＰ１の非反転入力端子に接続される抵抗を切り換えて、位相補正量を可変とすることができる。   Furthermore, instead of the resistor R1, if a plurality of resistors are connected in parallel through the switches provided in the multiplexer between the current detection signal V2 input and the non-inverting input terminal of the operational amplifier OP1, it is turned on by a control signal supplied to the multiplexer. By switching the switch, the resistance connected to the non-inverting input terminal of the operational amplifier OP1 can be switched to make the phase correction amount variable.

本発明の実施形態１の位相調整回路の構成を示す図である。It is a figure which shows the structure of the phase adjustment circuit of Embodiment 1 of this invention. 同上の電力量計が具備する電力量演算機能のブロック構成を示す図である。It is a figure which shows the block configuration of the electric energy calculation function which the electric energy meter same as the above comprises. 本発明の実施形態２の位相調整回路の構成を示す図である。It is a figure which shows the structure of the phase adjustment circuit of Embodiment 2 of this invention. 本発明の実施形態３の位相調整回路の構成を示す図である。It is a figure which shows the structure of the phase adjustment circuit of Embodiment 3 of this invention. 本発明の実施形態４の電力量計が具備する電力量演算機能のブロック構成を示す図である。It is a figure which shows the block configuration of the electric energy calculation function which the watt-hour meter of Embodiment 4 of this invention comprises. 同上の位相調整回路の構成を示す図である。It is a figure which shows the structure of a phase adjustment circuit same as the above. 従来の位相調整回路の第１の構成を示す図である。It is a figure which shows the 1st structure of the conventional phase adjustment circuit. 従来の位相調整回路の第２の構成を示す図である。It is a figure which shows the 2nd structure of the conventional phase adjustment circuit.

符号の説明Explanation of symbols

３ａ 位相調整回路
ＯＰ１ オペアンプ
Ｒ１〜Ｒ３ 抵抗
Ｃ１ コンデンサ 3a Phase adjustment circuit OP1 Operational amplifier R1 to R3 Resistor C1 Capacitor

Claims (3)

電圧の検出信号と変流器を用いて検出した電流の検出信号とに基づいて電力量を計測する電力量計の位相調整回路において、オペアンプと、前記オペアンプの非反転入力端子とグランドレベル間に接続した抵抗と、前記オペアンプの非反転入力端子に一端を接続したコンデンサとを備え、前記コンデンサの他端に電圧の検出信号を入力し、前記オペアンプのゲインを負帰還によって所定値に設定したことを特徴とする電力量計の位相調整回路。 In an energy meter phase adjustment circuit that measures energy based on a voltage detection signal and a current detection signal detected using a current transformer, the operational amplifier is connected between the non-inverting input terminal of the operational amplifier and the ground level. A connected resistor and a capacitor having one end connected to the non-inverting input terminal of the operational amplifier; a voltage detection signal is input to the other end of the capacitor; and the gain of the operational amplifier is set to a predetermined value by negative feedback A phase adjustment circuit for a watt-hour meter characterized by 電圧の検出信号と変流器を用いて検出した電流の検出信号とに基づいて電力量を計測する電力量計の位相調整回路において、オペアンプと、前記オペアンプの非反転入力端子とグランドレベル間に接続したコンデンサと、前記オペアンプの非反転入力端子に一端を接続した抵抗とを備え、前記抵抗の他端に前記変流器が出力する電流の検出信号を入力し、前記オペアンプのゲインを負帰還によって所定値に設定したことを特徴とする電力量計の位相調整回路。 In an energy meter phase adjustment circuit that measures energy based on a voltage detection signal and a current detection signal detected using a current transformer, the operational amplifier is connected between the non-inverting input terminal of the operational amplifier and the ground level. A connected capacitor and a resistor having one end connected to the non-inverting input terminal of the operational amplifier, the current detection signal output from the current transformer is input to the other end of the resistor, and the gain of the operational amplifier is negatively fed back A phase adjustment circuit of a watt-hour meter, wherein the phase adjustment circuit is set to a predetermined value by 前記抵抗は並列接続された複数の抵抗素子からなり、各抵抗素子に直列にスイッチを接続して、各スイッチのオン・オフ状態を切り換えることで前記抵抗の値を切り換えることを特徴とする請求項１または２記載の電力量計の位相調整回路。 The resistance is composed of a plurality of resistance elements connected in parallel, and a switch is connected in series to each resistance element, and the value of the resistance is switched by switching an on / off state of each switch. The phase adjustment circuit of the watt-hour meter according to 1 or 2.
JP2004048632A 2004-02-24 2004-02-24 Phase adjustment circuit of watthour meter Pending JP2005241305A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011087412A (en) * 2009-10-15 2011-04-28 Jtekt Corp Motor controller and electric power steering device
WO2013030655A1 (en) * 2011-08-31 2013-03-07 パナソニック株式会社 Electricity meter
CN109030901A (en) * 2018-08-06 2018-12-18 安徽天光传感器有限公司 A kind of built-in voltage electric current one transmitter
CN109672452A (en) * 2019-02-25 2019-04-23 深圳瑞湖科技有限公司 A kind of pressure sensitivity key detection differential circuit and electronic equipment

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011087412A (en) * 2009-10-15 2011-04-28 Jtekt Corp Motor controller and electric power steering device
WO2013030655A1 (en) * 2011-08-31 2013-03-07 パナソニック株式会社 Electricity meter
JP2013050385A (en) * 2011-08-31 2013-03-14 Panasonic Corp Power measuring instrument
CN103748475A (en) * 2011-08-31 2014-04-23 松下电器产业株式会社 Electricity meter
CN109030901A (en) * 2018-08-06 2018-12-18 安徽天光传感器有限公司 A kind of built-in voltage electric current one transmitter
CN109030901B (en) * 2018-08-06 2023-09-26 安徽天光传感器有限公司 Built-in voltage and current integrated transmitter
CN109672452A (en) * 2019-02-25 2019-04-23 深圳瑞湖科技有限公司 A kind of pressure sensitivity key detection differential circuit and electronic equipment

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