JPH0443967A - Electronic watt-hour meter - Google Patents
Electronic watt-hour meterInfo
- Publication number
- JPH0443967A JPH0443967A JP2152418A JP15241890A JPH0443967A JP H0443967 A JPH0443967 A JP H0443967A JP 2152418 A JP2152418 A JP 2152418A JP 15241890 A JP15241890 A JP 15241890A JP H0443967 A JPH0443967 A JP H0443967A
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- Prior art keywords
- voltage
- potential
- circuit
- output potential
- time
- Prior art date
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Links
- 239000003990 capacitor Substances 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 230000004044 response Effects 0.000 claims description 2
- 230000010354 integration Effects 0.000 abstract description 5
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、電力をパルス数に変換し、該パルスをカウン
トすることにより電力量を積算計測する電子式電力量計
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic watt-hour meter that integrally measures the amount of power by converting power into a number of pulses and counting the pulses.
従来、電子式電力量計には、第２図に示すように、入力
電圧ＩＶと入力電流ＩＣの積に相当する出力電位を発生
する乗算回路１と、この出力電位を積分してその積分値
に比例した周波数を備えた方形波を出力すべき電圧周波
数変換回路２と、この方形波のパルス数をカウントする
ための計数回路３から構成されるものがある。Conventionally, as shown in FIG. 2, an electronic watt-hour meter includes a multiplier circuit 1 that generates an output potential corresponding to the product of an input voltage IV and an input current IC, and a multiplier circuit 1 that integrates this output potential and calculates its integral value. Some circuits include a voltage frequency conversion circuit 2 that outputs a square wave with a frequency proportional to , and a counting circuit 3 that counts the number of pulses of this square wave.
ここで、電圧周波数変換回路２には、演算増幅器４及び
コンデンサ５からなる積分回路と、この積分回路の出力
を入力とする単安定マルチバイブレータ６と、この単安
定マルチバイブレーク６の出力電位により制御されるＭ
ＯＳＦＥＴ等からなるスイッチ７と、が設けられている
。Here, the voltage frequency conversion circuit 2 includes an integrating circuit consisting of an operational amplifier 4 and a capacitor 5, a monostable multivibrator 6 which receives the output of this integrating circuit, and is controlled by the output potential of the monostable multivibrator 6. M to be done
A switch 7 made of an OSFET or the like is provided.
この回路では、乗算回路１の正の出力電位ｖｒが積分回
路に導入されるので、第３図（ａ）に示すようにその積
分値たる出力電位■えは時間とともに下降していく、こ
の出力電位■＾が単安定マルチバイブレーク６のしきい
値ｖｃに到達すると単安定マルチバイブレータ６の出力
電位ｖＩが切り替えられ、これによりスイッチ７は導通
してコンデンサ５の蓄積電荷を放電する。このようにし
て、再び積分回路の出力電圧が初期化された後、単安定
マルチバイブレーク６の出力電位■、は、回路定数で定
まる動作時間Ｔの経過後に再び元の電位に戻る。出力電
位■、が復帰するとスイッチ７は遮断されるようになっ
ており、再び乗算回路１の出力電位の積分が開始され、
出力電位ｖＡが下降を開始する。In this circuit, the positive output potential vr of the multiplier circuit 1 is introduced into the integrating circuit, so as shown in FIG. When the potential ■^ reaches the threshold value vc of the monostable multivibrator 6, the output potential vI of the monostable multivibrator 6 is switched, whereby the switch 7 becomes conductive and the accumulated charge in the capacitor 5 is discharged. In this way, after the output voltage of the integrating circuit is initialized again, the output potential (2) of the monostable multi-bi-break 6 returns to the original potential again after the operation time T determined by the circuit constants has elapsed. When the output potential ■ returns, the switch 7 is cut off, and the integration of the output potential of the multiplier circuit 1 is started again.
The output potential vA starts to fall.
この繰り返しにより、第３図（ａ）に示す出力電位ｖＡ
の三角波に対応して、出力電圧Ｖ、は、第３図（ｂ）に
示すように方形波を形成する。この方形パルスの周波数
は乗算回路１の出力電位■、に比例するので、このパル
ス数を計数回路３により計測することにより、電力量を
積算することができる。By repeating this process, the output potential vA shown in FIG. 3(a)
Corresponding to the triangular wave, the output voltage V forms a square wave as shown in FIG. 3(b). Since the frequency of this rectangular pulse is proportional to the output potential (2) of the multiplier circuit 1, by measuring the number of pulses by the counting circuit 3, the electric energy can be integrated.
〔発明が解決しようとする課Ｂ］
しかしながら、上記従来の電力量計においては以下の問
題点がある。すなわち、上記電力量計の動作電力は、一
般に被計測部側の電源から回路内の電源回路を介して減
圧して供給されるが、電源導入時において、上記電圧周
波数変換回路２内の演算増幅器４や単安定マルチバイブ
レータ６等が供給電位の影響を受けて内部の電位が変動
する場合があり、特に、演算増幅器４の出力電位■、が
電源回路の供給電位まで引上げられる場合がある、この
状態から安定状態へと戻るには、回路定数によっても異
なるが、通常、数十〜数百ｍｓ程度の時間を要し、この
状態で計数回路３を作動させておくと、正規の入力電圧
ＩＶ及び入力電流ＩＣに因らない過大な又は過少な電力
量を出力してしまい、その間本来の電力計測が妨げられ
るので、電力量の絶対値の精度低下が問題となっていた
。[Problem B to be Solved by the Invention] However, the conventional power meter described above has the following problems. That is, the operating power of the above-mentioned watt-hour meter is generally supplied from the power supply on the side to be measured through the power supply circuit in the circuit, but when the power supply is introduced, the operational amplifier in the voltage-frequency conversion circuit 2 4, monostable multivibrator 6, etc. may fluctuate in their internal potential due to the influence of the supply potential, and in particular, the output potential of the operational amplifier 4 may be raised to the supply potential of the power supply circuit. Normally, it takes several tens to hundreds of milliseconds to return to a stable state, although this varies depending on the circuit constants.If the counting circuit 3 is operated in this state, the normal input voltage IV Also, an excessive or insufficient amount of electric power that is not related to the input current IC is outputted, and during this time, the original electric power measurement is obstructed, resulting in a problem of decreased accuracy of the absolute value of the electric amount.
このため、電力量計にタイマー機能を設け、電源投入時
には、当初の一定時間（上記の安定状態に復帰するまで
の時間を考慮して、充分な時間−〇、５Ｓ程度−に設定
している。）において計数回路３における計測を停止さ
せ、電源投入時初期における電力計測を行わないように
していたが、この計測停止時間においては、正規の入力
に基づく電力計測値までもが計測から排除されるので、
電力量の精度の向上には結び付かないという欠点があっ
た。For this reason, the electricity meter is equipped with a timer function, and when the power is turned on, it is set to an initial fixed period of time (taking into consideration the time it takes to return to the above-mentioned stable state, a sufficient period of time - about 5 seconds). ), the measurement in the counting circuit 3 was stopped to prevent power measurement at the initial stage when the power was turned on, but during this measurement stop time, even the power measurement value based on the regular input was excluded from the measurement. Because
This method has the disadvantage that it does not lead to improvement in the accuracy of electric power consumption.
そこで、本発明は、上記問題点を解決するものであり、
その課題は、積分回路の出力電圧を一定範囲に抑えるこ
とによって、電圧周波数変換回路２の起動時における安
定化時間を短縮し、高精度の電力量計測が可能な電子式
電力量計を提供することにある。Therefore, the present invention solves the above problems,
The objective is to shorten the stabilization time at startup of the voltage frequency conversion circuit 2 by suppressing the output voltage of the integrating circuit within a certain range, and to provide an electronic watt-hour meter that can measure the amount of electricity with high precision. There is a particular thing.
上記課題を解決するために、入力電圧と入力電流の積に
相当する電圧を出力すべき乗算手段と、該電圧に相当す
る周波数を備えたパルスを出力すべき電圧周波数変換手
段と、該パルスのパルス数を計測すべき計数手段と、を
有しており、電圧周波数変換手段は、帰還容量を備えた
積分回路と、積分回路の出力電圧に対する所定しきい値
により２値信号を出力すべき電圧比較手段と、この２値
信号に対応して積分回路の出力電圧を初期化すべきスイ
ッチング手段と、を備えている電子式電力量針において
、本発明が講じた手段は、帰還容量の充電極性とは逆に
なる方向に、すなわち、積分回路の動作時に充電状態と
な゛っている帰還容量により逆バイアスが印加される方
向に、定電圧ダイオードを帰還容量に対して並列に接続
するものである。In order to solve the above problems, a multiplier that outputs a voltage corresponding to the product of an input voltage and an input current, a voltage frequency converter that outputs a pulse having a frequency corresponding to the voltage, and a voltage frequency converter that outputs a pulse having a frequency corresponding to the voltage, Counting means for measuring the number of pulses; and the voltage frequency conversion means includes an integrating circuit having a feedback capacitance, and a voltage for outputting a binary signal based on a predetermined threshold value for the output voltage of the integrating circuit. In an electronic power amount needle equipped with a comparison means and a switching means for initializing the output voltage of the integrating circuit in response to the binary signal, the measures taken by the present invention are such that the charging polarity of the feedback capacitance and the In this case, a constant voltage diode is connected in parallel to the feedback capacitor in the opposite direction, that is, in the direction in which a reverse bias is applied by the feedback capacitor that is in a charged state when the integrating circuit is operating. .
かかる手段によれば、通常の動作時には、帰還容量の充
電極性に対して逆方向に並列接続された定電圧ダイオー
ドに対し逆バイアスが印加された状態となり、定電圧ダ
イオードのツェナー電圧が帰還容量の最大値よりも大き
な値をもつように回路を構成しておくことにより、定電
圧ダイオードの接続部分は回路動作に寄与せず、その積
分回路は完全な積分回路として従来通り機能する。According to this means, during normal operation, a reverse bias is applied to the constant voltage diode connected in parallel in the opposite direction to the charging polarity of the feedback capacitor, and the Zener voltage of the constant voltage diode becomes equal to that of the feedback capacitor. By configuring the circuit to have a value larger than the maximum value, the connecting portion of the constant voltage diode does not contribute to the circuit operation, and the integrating circuit functions as a complete integrating circuit as before.
一方、被測定器が接続されて電力量計の電源回路が立ち
上がった際、この電源電位に伴って積分回路の出力電圧
が大きく上下した結果、積分回路の帰還容量に対して通
常動作とは逆方向の電位差が生じた場合には、定電圧ダ
イオードには順方向バイアスが印加された状態となり、
積分回路はいわゆる不完全積分回路として動作し、定電
圧ダイオードを通して帰還電流が流れるため、積分回路
の本来的な機能は、帰還容量の逆方向の電位差を減する
方向に積分回路の出力電位を迅速に戻す作用を果たす。On the other hand, when the device under test is connected and the power supply circuit of the watt-hour meter starts up, the output voltage of the integrator circuit fluctuates significantly with this power supply potential, which is opposite to normal operation with respect to the feedback capacitance of the integrator circuit. When a potential difference occurs in the direction, a forward bias is applied to the constant voltage diode,
The integrating circuit operates as a so-called incomplete integrating circuit, and the feedback current flows through the constant voltage diode, so the essential function of the integrating circuit is to quickly change the output potential of the integrating circuit in the direction of reducing the potential difference in the opposite direction of the feedback capacitor. It has the effect of returning it to
この作用は、自分回路として演算増幅器の反転入力と出
力間に帰還容量を並列接続した回路を用いる場合には特
に顕著となる。また、逆に、帰還容量に対して通常動作
と同方向の大きな電位差が印加される場合には、定電圧
ダイオードに対しては大きな逆バイアスが印加された状
態となり、その逆バイアスが定電圧ダイオードのツェナ
ー電圧を越える領域においては、積分回路は不完全積分
回路として動作することとなり、定電圧ダイオードには
逆方向電流が流れ、積分回路の出力電位を入力電位に対
して定電圧ダイオードのツェナー電圧の電位差まで戻す
と共に、その逆方向電流が帰還電流となって、上記と同
様に積分回路の出力電位を安定状態に戻す作用をする。This effect becomes particularly noticeable when a circuit in which a feedback capacitor is connected in parallel between the inverting input and the output of an operational amplifier is used as the own circuit. Conversely, if a large potential difference in the same direction as in normal operation is applied to the feedback capacitor, a large reverse bias will be applied to the voltage regulator diode, and that reverse bias will cause the voltage regulator diode to In the region where the Zener voltage exceeds the Zener voltage of At the same time, the reverse current becomes a feedback current, which functions to return the output potential of the integrating circuit to a stable state in the same manner as described above.
この場合、当然ながら、従来と同様に出力電位の初期化
のためのスイッチング手段の閉成に伴う安定状態への復
帰作用も同時に行われる。In this case, of course, as in the conventional case, the action of returning to a stable state is also performed simultaneously with the closing of the switching means for initializing the output potential.
このように、積分回路の出力電位が正負に大きく揺動し
た場合でも、従来よりも短時間に電圧周波数変換手段を
安定状態に復帰させることができる。したがって、電力
量計の電源投入時における非計測時間を短縮させること
が可能であり、電力量の絶対値の精度を向上させること
ができる。In this way, even when the output potential of the integrating circuit fluctuates significantly in positive and negative directions, the voltage frequency conversion means can be returned to a stable state in a shorter time than in the past. Therefore, it is possible to shorten the non-measuring time when the power meter is powered on, and it is possible to improve the accuracy of the absolute value of the power amount.
次に、本発明の実施例を添付図面を参照して説明する。 Next, embodiments of the present invention will be described with reference to the accompanying drawings.
第１図に示すように、本実施例の電子式電力量計は、乗
算回路１と電圧周波数変換回路２と計数回路３とから大
略構成される。この電力量針では、電源９と負荷１０と
の接続部から電圧入力部１１と電流入力部１２により所
定電位に変換された入力電圧ＩＶ及び入力電流ＩＣとを
乗算回路１に導入し、この乗算回路１により負荷９に供
給される電力に相当する電位■ｒが出力される。As shown in FIG. 1, the electronic watt-hour meter of this embodiment is roughly composed of a multiplication circuit 1, a voltage frequency conversion circuit 2, and a counting circuit 3. In this electric energy needle, an input voltage IV and an input current IC, which have been converted to a predetermined potential by a voltage input section 11 and a current input section 12, are introduced from a connection between a power supply 9 and a load 10 into a multiplication circuit 1, and the multiplication A potential ■r corresponding to the power supplied to the load 9 by the circuit 1 is output.
この電位■、は、演算増幅器４とコンデンサ５との並列
接続により構成される積分回路に入力されており、電位
■、の積分値が出力電位■、とじて出力される。この出
力電位ｖＡは単安定マルチバイブレータ６に導入され、
出力電位ｖＡが単安定マルチパイプレーク６のしきい値
Ｖ、を越えるとその出゛力電位■諺がＬレベルからＨレ
ベルへと切り替わるようになっている。このようにして
、出力電位■、がＨレベルになると、これを制御電位と
するスイッチ７が閉成し、定電流源８を通してコンデン
サ５を放電し、これによって、積分回路の出力電位■、
を初期化する。単安定マルチバイブレーク６の出力電位
■、は、回路の所定定数により定まる動作時間（・１０
０ａｓ程度）後にもとのＬレベルに復帰し、これにより
スイッチ７が開成するので、再び積分回路により出力電
位Ｖ、が上昇を開始する。This potential (2) is input to an integrating circuit constituted by an operational amplifier 4 and a capacitor 5 connected in parallel, and the integrated value of the potential (2) is output as an output potential (2). This output potential vA is introduced into the monostable multivibrator 6,
When the output potential vA exceeds the threshold value V of the monostable multipipe lake 6, the output potential VA switches from the L level to the H level. In this way, when the output potential ■ becomes H level, the switch 7 that uses this as the control potential closes, and the capacitor 5 is discharged through the constant current source 8, thereby causing the output potential of the integrating circuit to become
Initialize. The output potential of the monostable multi-bibreak 6 is the operating time (・10
After about 0 as), the voltage returns to the original L level, and as a result, the switch 7 is opened, so that the output potential V starts to rise again by the integrating circuit.
本実施例では、積分回路のコンデンサ５に対して並列に
定電圧ダイオードＺＤＩ及びＺＤ２を接続した。これら
の定電圧ダイオードＺＤＩ及びＺＤ２は、互いに逆方向
に直列接続されており、定電圧ダイオードＺＤ２のツェ
ナー電圧は、通常の動作時における積分回路の入出力電
位差（ＶＰ■Ａ）を考慮して、その電位差の最大値（■
、−ＶＣ）よりも大きな値となるように設定する。この
結果、通常の動作時においては、演算増幅器４とコンデ
ンサ５からなる積分回路のみが動作することとなるが、
入力電位■、−出力電位■、がツェナー電圧を越えた場
合には不完全積分回路が構成され、定電圧ダイオードＺ
ＤＩ及びＺＤ２を通して帰還電流が流れることから、入
力電位■、−出力電位■＾をツェナー電圧まで強制的に
減少させると共に、入力電位■２を上昇又は下降させて
演算増幅器４の反転増幅作用により、出力電位Ｖ、を迅
速に安定化させる。第４図には、電源投入時に積分回路
の出力電位■、が負電位に大きく揺動した場合における
その安定状態への復帰経過を示す、定電圧ダイオードＺ
ＤＩにより、出力電位ｖＡはそのツェナー電圧程度以下
には低下せず、また、その帰還電流が演算増幅器４に作
用することによって、従来よりも極めて迅速に安定状態
へと復帰する。勿論、出力電位■、が正電位に大きく揺
動した場合においても同様に作用する。この結果、従来
よりも電圧周波数変換回路２内を安定状態に復帰させる
時間が大幅に短縮される。なお本実施例では、定電圧ダ
イオードＺＤＩをも導入して電力量計を構成したが、本
発明における上記作用には直接寄与しないので、定電圧
ダイオードＺＤ２のみを接続してもよい。この場合には
、出力電位Ｖ、が正電位に大きく揺動した際、定電圧ダ
イオードＺＤ２の順方向電圧降下にまで出力電位ＶＡと
入力電位■、の電位差を極めて短時間に低減させ、この
電位差が順方向電圧降下値から安定状態に復帰するまで
の時間も極めて短くなる。In this embodiment, constant voltage diodes ZDI and ZD2 were connected in parallel to the capacitor 5 of the integrating circuit. These constant voltage diodes ZDI and ZD2 are connected in series in opposite directions, and the Zener voltage of the constant voltage diode ZD2 is determined by taking into account the input/output potential difference (VP■A) of the integrating circuit during normal operation. The maximum value of that potential difference (■
, -VC). As a result, during normal operation, only the integrating circuit consisting of the operational amplifier 4 and the capacitor 5 operates.
When the input potential ■, -output potential ■, exceeds the Zener voltage, an incomplete integration circuit is formed, and the constant voltage diode Z
Since a feedback current flows through DI and ZD2, the input potential (2) and -output potential (2) are forcibly reduced to the Zener voltage, and the input potential (2) is raised or lowered to achieve the inverting amplification action of the operational amplifier 4. The output potential V is quickly stabilized. Figure 4 shows the process of returning to a stable state when the output potential of the integrating circuit swings significantly to a negative potential when the power is turned on.
Due to DI, the output potential vA does not fall below its Zener voltage, and its feedback current acts on the operational amplifier 4, so that it returns to a stable state much more quickly than in the past. Of course, the same effect occurs even when the output potential (1) fluctuates significantly toward the positive potential. As a result, the time required to return the inside of the voltage frequency conversion circuit 2 to a stable state is significantly shortened compared to the conventional art. In this embodiment, the electricity meter is constructed by also introducing the constant voltage diode ZDI, but since it does not directly contribute to the above-mentioned effect of the present invention, only the constant voltage diode ZD2 may be connected. In this case, when the output potential V greatly swings to a positive potential, the potential difference between the output potential VA and the input potential ■ is reduced in a very short time to the forward voltage drop of the constant voltage diode ZD2, and this potential difference is The time it takes for the voltage to return to a stable state from the forward voltage drop value is also extremely short.
従来、電源投入から安定状態に到るまでの所要時間は数
十〜数百ｍｓ程度必要であったが、この実施例では数ｍ
ｓ程度と、大幅に安定化時間が短縮した。この結果、電
源投入時の非計測時間を設定する必要がなく、或いは設
定した場合でも極めて短時間で足りるため、その非計測
時間内の電力量の測定電力量値に対する寄与は殆ど無視
することができる。したがって、この実施例による電力
計では、従来よりも大幅な電力量計測値の精度向上が期
待できる。Conventionally, the time required from turning on the power to reaching a stable state was on the order of tens to hundreds of milliseconds, but in this example, it takes several milliseconds to reach a stable state.
The stabilization time was significantly shortened to approximately 2 seconds. As a result, there is no need to set a non-measuring time when the power is turned on, or even if it is set, it is only for a very short time, so the contribution of the electric energy during that non-measuring time to the measured electric energy value can be almost ignored. can. Therefore, in the wattmeter according to this embodiment, it is expected that the accuracy of the wattage measurement value will be significantly improved compared to the conventional one.
〔発明の効果〕
以上説明したように、本発明は、帰還容量の充電極性に
対して逆方向に、定電圧ダイオードをその帰還容量に対
して並列に接続したことに特徴を有するので、以下の効
果を奏する。[Effects of the Invention] As explained above, the present invention is characterized in that a constant voltage diode is connected in parallel to the feedback capacitor in the opposite direction to the charging polarity of the feedback capacitor. be effective.
積分回路の出力電圧が正又は負の絶対値の大きな値とな
った場合でも、定電圧ダイオードの並列接続部に帰還電
流が流れることにより、直接に積分回路の出力電位を安
定状態における電位へと近づけると共に、その帰還電流
が積分回路の入力電位を上昇させることから、極めて迅
速に出力電位を通常電位にまで復帰させることができる
。したがって、電力量計の電源投入時における非計測時
間を短縮化することが可能であり、電力量の計測精度を
向上させることができる。Even when the output voltage of the integrating circuit becomes a large positive or negative absolute value, the feedback current flows through the parallel connection of the constant voltage diodes, directly bringing the output potential of the integrating circuit to the stable state potential. At the same time as the feedback current increases the input potential of the integrating circuit, the output potential can be returned to the normal potential extremely quickly. Therefore, it is possible to shorten the non-measuring time when the power meter is turned on, and it is possible to improve the measurement accuracy of electric energy.
第１図は本発明による電子式電力量計の実施例の構成を
示す回路図である。
第２図は電子式電力量計の従来例の構成を示す回路図で
ある。
第３図（ａ）は第１図に示す実施例及び従来例の積分回
路の出力電位の波形図であり、第３図（ｂ）は同実施例
及び従来例の単安定マルチバイブレークの出力電位の波
形図である。
第４図は電源投入時における同実施例と従来例の積分回
路の安定状態への復帰を示すために、積分回路の出力電
位の変化を示す波形図である。
〔符号の説明〕
１・・・乗算回路
２・・・電圧周波数変換回路
３・・・計数回路
４・・・演算増幅器
５・・・コンデンサ
６・・・単安定マルチバイブレータ
７・・・スイッチ
第
図
第
図
第
図FIG. 1 is a circuit diagram showing the configuration of an embodiment of an electronic watt-hour meter according to the present invention. FIG. 2 is a circuit diagram showing the configuration of a conventional electronic watt-hour meter. 3(a) is a waveform diagram of the output potential of the integrating circuit of the embodiment and the conventional example shown in FIG. 1, and FIG. 3(b) is the output potential of the monostable multi-bibreak of the embodiment and the conventional example. FIG. FIG. 4 is a waveform diagram showing changes in the output potential of the integrating circuit in order to show the return of the integrating circuit of the embodiment and the conventional example to a stable state when the power is turned on. [Explanation of symbols] 1... Multiplier circuit 2... Voltage frequency conversion circuit 3... Counting circuit 4... Operational amplifier 5... Capacitor 6... Monostable multivibrator 7... Switch No. Figure Figure Figure
Claims (1)
算手段と、該電圧の所定時間積分値に相当する周波数を
備えたパルスを出力すべき電圧周波数変換手段と、該パ
ルスのパルス数を計測すべき計数手段と、を有しており
、前記電圧周波数変換手段は、帰還容量を備えた積分回
路と、該積分回路の出力電圧に対する所定しきい値によ
り２値信号を出力すべき電圧比較手段と、該２値信号に
対応して前記積分回路の出力電圧を初期化すべきスイッ
チング手段と、を備えている電子式電力量計において、 前記帰還容量の充電極性とは逆方向に定電圧ダイオード
を前記帰還容量に対して並列に接続したことを特徴とす
る電子式電力量計。[Claims] A multiplier that outputs a voltage corresponding to the product of an input voltage and an input current; a voltage frequency converter that outputs a pulse having a frequency that corresponds to a predetermined time integral value of the voltage; and counting means for measuring the number of pulses, and the voltage frequency conversion means includes an integrating circuit having a feedback capacitance, and converting a binary signal into a binary signal based on a predetermined threshold value for the output voltage of the integrating circuit. and switching means to initialize the output voltage of the integrating circuit in response to the binary signal, the charging polarity of the feedback capacitor is An electronic watt-hour meter characterized in that a constant voltage diode is connected in parallel to the feedback capacitor in the opposite direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2152418A JP2674282B2 (en) | 1990-06-11 | 1990-06-11 | Electronic watt-hour meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2152418A JP2674282B2 (en) | 1990-06-11 | 1990-06-11 | Electronic watt-hour meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0443967A true JPH0443967A (en) | 1992-02-13 |
| JP2674282B2 JP2674282B2 (en) | 1997-11-12 |
Family
ID=15540081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2152418A Expired - Lifetime JP2674282B2 (en) | 1990-06-11 | 1990-06-11 | Electronic watt-hour meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2674282B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002168893A (en) * | 2000-11-30 | 2002-06-14 | Agilent Technologies Japan Ltd | High accuracy capacity measurement device and method |
-
1990
- 1990-06-11 JP JP2152418A patent/JP2674282B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002168893A (en) * | 2000-11-30 | 2002-06-14 | Agilent Technologies Japan Ltd | High accuracy capacity measurement device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2674282B2 (en) | 1997-11-12 |
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