JPH044228Y2 - - Google Patents
Info
- Publication number
- JPH044228Y2 JPH044228Y2 JP7348882U JP7348882U JPH044228Y2 JP H044228 Y2 JPH044228 Y2 JP H044228Y2 JP 7348882 U JP7348882 U JP 7348882U JP 7348882 U JP7348882 U JP 7348882U JP H044228 Y2 JPH044228 Y2 JP H044228Y2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- phase
- circuit
- display
- phase rotation
- 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.)
- Expired
Links
- 238000005259 measurement Methods 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 description 12
- 229910052754 neon Inorganic materials 0.000 description 11
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004397 blinking Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Description
【考案の詳細な説明】
この考案は、デジタル表示によつて電圧を表示
する簡易形のデジタル電圧計に係わり、特に、三
相交流電源の相回転を表示することもできるよう
にした相回転表示付デジタル電圧計に関するもの
である。[Detailed description of the invention] This invention relates to a simple digital voltmeter that displays voltage using a digital display, and in particular, a phase rotation display that can also display the phase rotation of a three-phase AC power source. This relates to a digital voltmeter.
近年、アナログデジタル変換用の集積回路
（Ａ／Ｄ変換器）が比較的安価で市販されており、
そのため指針形のアナログ電圧計に代えてデジタ
ル電圧計が使用されるようになつてきた。 In recent years, integrated circuits for analog-to-digital conversion (A/D converters) have become commercially available at relatively low prices.
For this reason, digital voltmeters have come to be used in place of pointer-shaped analog voltmeters.
デジタル電圧計では、Ａ／Ｄ変換器の電子回路
（IC）および電圧値を表示する表示器が必要にな
るので、これらの電子回路および表示器を駆動す
るための直流電源を内蔵させることになる。 Digital voltmeters require an electronic circuit (IC) for the A/D converter and a display to display the voltage value, so a DC power supply is built in to drive these electronic circuits and the display. .
ところで、このような直流電源を測定すべき電
圧から供給するような方式にすれば、アナログ形
メータと同様に使用することができるので便利で
ある。 By the way, it would be convenient if such a DC power source was supplied from the voltage to be measured, since it could be used in the same way as an analog meter.
この考案は、かゝる方式を採用してデジタル電
圧計を形成すると共に、測定電圧が三相交流の場
合は、その相回転方向も同時に表示できるように
した相回転表示付デジタル電圧計を供給するもの
である。 This invention adopts such a method to form a digital voltmeter, and also provides a digital voltmeter with a phase rotation display that can simultaneously display the phase rotation direction when the measured voltage is three-phase AC. It is something to do.
以下、この考案の一実施について添付した図面
により説明する。 Hereinafter, one implementation of this invention will be explained with reference to the attached drawings.
第１図は相回転表示付デジタル電圧計の回路図
を示したもので、P1，P2，P3は交流電圧の測定
端子、１はダイオードD1〜D4からなる全波整流
回路、２は後述するＡ／Ｄ変換器及び表示器の駆
動直流電圧＋Ｖ，−Ｖを形成するための電源回路
で、ダイオードD5、ツエナーダイオードD6，D7
および平滑用のコンデンサC1，C2によつて形成
されている。３は測定電圧をＡ／Ｄ変換するIC
回路５に供給する電圧分圧回路で、抵抗r1〜r3お
よびコンデンサC3で形成されている。また、４
はＡ／Ｄ変換用のIC回路５に基準電圧を供給す
るための基準電圧設定回路で、抵抗r4、可変抵抗
器r5によつて形成される。５は測定電圧をデジタ
ル値に変換するＡ／Ｄ変換用のIC回路
（ICL7106）で、２重積分方式でアナログデジタ
ル変換するものである。６は前記IC回路５の出
力信号をデジタル値で表示する７セグメントの表
示器で、消費電力の小さい液晶表示形が好まし
い。 Figure 1 shows a circuit diagram of a digital voltmeter with phase rotation display, where P 1 , P 2 , and P 3 are AC voltage measurement terminals, 1 is a full-wave rectifier circuit consisting of diodes D 1 to D 4 , 2 is a power supply circuit for forming driving DC voltages +V and -V for the A/D converter and display, which will be described later, and includes a diode D 5 and a Zener diode D 6 and D 7
and smoothing capacitors C 1 and C 2 . 3 is an IC that A/D converts the measured voltage
This is a voltage dividing circuit that supplies the circuit 5, and is formed by resistors r1 to r3 and a capacitor C3 . Also, 4
is a reference voltage setting circuit for supplying a reference voltage to the A/D conversion IC circuit 5, and is formed by a resistor r4 and a variable resistor r5 . 5 is an A/D conversion IC circuit (ICL7106) that converts the measured voltage into a digital value, which performs analog-to-digital conversion using a double integration method. Reference numeral 6 denotes a 7-segment display that displays the output signal of the IC circuit 5 in digital values, and is preferably a liquid crystal display type with low power consumption.
つづいて、上記の回路構成について簡単に説明
する。 Next, the above circuit configuration will be briefly explained.
まず、このデジタル電圧計で測定すべき主たる
範囲を商用の三相交流電源とする。測定端子P1，
P2，P3間に三相の交流電圧を印加すると、測定
端子P1，P2間の電圧は全波整流回路１によつて
一方向性の電圧とされ、電源回路２に入力され
る。今、ツエナーダイオードD6，D7のツエナー
電圧を6Vに設定しておくと、図示の回路では、
VCC＝6V、VDD＝−6V、および接地電圧OVがIC
回路５に駆動電圧として供給される。 First, let us assume that the main range to be measured with this digital voltmeter is a commercial three-phase AC power supply. Measurement terminal P 1 ,
When a three-phase AC voltage is applied between P 2 and P 3 , the voltage between measurement terminals P 1 and P 2 is converted into a unidirectional voltage by the full-wave rectifier circuit 1, and is input to the power supply circuit 2. . Now, if we set the Zener voltage of Zener diodes D 6 and D 7 to 6V, in the circuit shown,
V CC = 6V, V DD = -6V, and ground voltage OV are IC
It is supplied to the circuit 5 as a driving voltage.
一方、全波整流された電圧は、電圧分圧回路３
において抵抗r1，r2により分圧され、抵抗r3、コ
ンデンサC3によつてリツプル分を除去されてIC
回路５の入力端子INに入力される。この入力端
子INに入力された電圧は、基準電圧設定回路４
の可変抵抗器r5で設定された一定の基準電圧端子
ERの電圧と比較され、IC回路５内でデジタル値
に変換される。そして、デジタル値に変換された
信号は、出力端子T1，T2，……TNから表示器６
に入力され、測定端子P1，P2間の電圧を数字で
表示する。 On the other hand, the full-wave rectified voltage is transferred to the voltage divider circuit 3.
The voltage is divided by resistors r 1 and r 2 at the IC, and the ripple component is removed by resistor r 3 and capacitor C 3 .
It is input to the input terminal IN of circuit 5. The voltage input to this input terminal IN is the reference voltage setting circuit 4.
A constant reference voltage terminal set by a variable resistor r 5
It is compared with the voltage of E R and converted into a digital value within the IC circuit 5. Then, the signals converted to digital values are sent from the output terminals T 1 , T 2 , ...T N to the display 6.
The voltage between measurement terminals P 1 and P 2 is displayed numerically.
なお、IC回路５には図示しないが、２重積分
を行うためのコンデンサや抵抗器が数個所の端子
に接続されており、オーバレンジを示す信号を出
力することもできる。又、表示器６にも直流電源
が印加されるものである。 Although not shown in the figure, the IC circuit 5 has capacitors and resistors connected to several terminals for double integration, and can also output a signal indicating overrange. Further, DC power is applied to the display 6 as well.
一点鎖線で囲つた分圧回路７は抵抗r7，r8、及
び可変抵抗器r9によつて測定端子P1，P2間の電圧
を分圧し、ネオン管N1を点灯させるもので、こ
の回路は、測定端子P1，P2間の電圧がある一定
値より低い場合は表示器６の照明も兼ねているネ
オン管N1を消灯し、Ａ／Ｄ変換用のIC回路５が
正常動作にないことをユーザに報知する正常動作
表示回路を形成している。 A voltage dividing circuit 7 surrounded by a dashed line divides the voltage between the measurement terminals P 1 and P 2 using resistors r 7 , r 8 and a variable resistor r 9 and lights up the neon tube N 1 . This circuit turns off the neon tube N1 , which also serves as the illumination of the display 6, when the voltage between the measurement terminals P1 and P2 is lower than a certain value, and indicates that the A/D conversion IC circuit 5 is normal. A normal operation display circuit is formed to notify the user that the device is not in operation.
ところで、三相交流電圧の測定は通常、各相の
電圧が120°の位相遅れとなり三相平衡電源として
供給されているので、測定端子P1，P2間で一相
の電圧を測定すればよいが、相回転の方向を知る
ためには三相交流電圧の位相関係を知る必要があ
る。 By the way, when measuring three-phase AC voltage, the voltage of each phase usually has a phase lag of 120° and is supplied as a three-phase balanced power supply, so if one phase voltage is measured between measurement terminals P 1 and P 2 , However, in order to know the direction of phase rotation, it is necessary to know the phase relationship of the three-phase AC voltage.
８は測定端子P1，P2，P3に接続されている三
相交流電圧の相回転を検出するための相回転検出
回路網を示したもので、抵抗r10，r11、コンデン
サC4の直列回路を測定端子P1，P2間に接続し、
抵抗r12，r13、コンデンサC5の直列回路を測定端
子P3，P2間に接続したものである。 8 shows a phase rotation detection circuit network for detecting the phase rotation of the three-phase AC voltage connected to the measurement terminals P 1 , P 2 , P 3 , which includes resistors r 10 , r 11 , capacitor C 4 Connect the series circuit between measurement terminals P 1 and P 2 ,
A series circuit of resistors r 12 and r 13 and capacitor C 5 is connected between measurement terminals P 3 and P 2 .
そして、抵抗r10，r11の接続点ｂと抵抗r12，r13
の接続点ｃの間に表示器６の照明を兼ねているネ
オン管N2を接続したものである。 Then, the connection point b of the resistors r 10 and r 11 and the resistors r 12 and r 13
A neon tube N2 , which also serves as illumination for the display 6, is connected between the connection point c.
第２図ａ，ｂは、相回転検出回路網８が三相交
流電圧の正回転及び逆回転を検出できることを説
明するベクトル図で、点線のE1，E2，E3は各測
定端子P1，P2，P3に印加されている三相交流電
圧を示す。この回路で抵抗値及び容量値を適当な
値とすると、
第２図ａのように各測定端子P1，P2，P3に印
加されている三相交流電圧の相回転がE1→E2→
E3の順で位相がおくれる正回転の場合は、測定
端子P1−P2間の電圧ベクトルはＸで表わされる。
ベクトルＸはコンデンサC4の端子電圧EC4と抵抗
r10＋r11の端子電圧ER1の合成電圧であるから、Ｂ
点、Ｄ点は抵抗r10，r11、コンデンサC4の接続点
ｂ，ｄの電圧を示すことになる。 FIGS. 2a and 2b are vector diagrams illustrating that the phase rotation detection circuit network 8 can detect forward and reverse rotation of the three - phase AC voltage. This shows the three-phase AC voltage applied to 1 , P2 , and P3 . If the resistance and capacitance values are set to appropriate values in this circuit, the phase rotation of the three-phase AC voltage applied to each measurement terminal P 1 , P 2 , P 3 will be E 1 →E as shown in Figure 2a. 2 →
In the case of forward rotation in which the phase lags in the order of E 3 , the voltage vector between the measurement terminals P 1 and P 2 is represented by X.
Vector X is the terminal voltage E C4 of capacitor C4 and resistance
Since the terminal voltage of r 10 + r 11 is the composite voltage of E R1 , B
Point and point D indicate the voltage at the connection points b and d of the resistors r 10 and r 11 and the capacitor C 4 .
一方、P3−P2間の電圧ベクトルはＹで表わさ
れ、コンデンサC5の端子電圧EC5と、抵抗r12＋r11
の端子電圧ER2の合成電圧である。そして、Ｃ点、
Ｅ点は抵抗r12，r13、コンデンサC5の接続点ｃ，
ｅの電圧を示すことになる。 On the other hand, the voltage vector between P 3 and P 2 is represented by Y, which is the terminal voltage E C5 of the capacitor C 5 and the resistor r 12 + r 11
is the composite voltage of the terminal voltage E R2 . And point C,
Point E is the connection point c of resistors r 12 , r 13 and capacitor C 5 ,
This indicates the voltage of e.
したがつて、ネオン管の印加電圧はＢ−Ｅ間の
電圧となり、この電位差によつて相回転が正の場
合に点灯する。 Therefore, the voltage applied to the neon tube becomes the voltage between BE and E, and due to this potential difference, the neon tube lights up when the phase rotation is positive.
しかしながら、第２図ｂのように各測定端子
P1，P2，P3に印加される電圧がE3←E2←E1とな
る逆相回の場合は、測定端子P1−P2間の電圧ベ
クトルはX′、測定端子P3−P2間の電圧ベクトル
はY′となる。 However, as shown in Figure 2b, each measurement terminal
In the case of an anti-phase circuit in which the voltages applied to P 1 , P 2 , and P 3 are E 3 ←E 2 ←E 1 , the voltage vector between measurement terminals P 1 and P 2 is X′, and the voltage vector between measurement terminals P 3 The voltage vector between −P 2 is Y′.
すると、正回転の場合と同様に、抵抗r10，r11
及びコンデンサC4の接続点ｂ，ｄの電圧はB′，
D′で示され、抵抗r12，r13及びコンデンサC5の接
続点ｃ，ｅの電圧C′，E′で示されることになる。 Then, as in the case of forward rotation, the resistances r 10 , r 11
And the voltage at connection points b and d of capacitor C4 is B′,
D' and the voltages C' and E' at the connection points c and e of the resistors r 12 and r 13 and the capacitor C 5 .
したがつて、ネオン管N2の印加電圧を示す
B′−C′間は近接し、その電位差はほぼ零電圧に近
くなる。そのため逆相回転の場合はネオン管N2
は点灯しない。 Therefore, indicating the applied voltage of the neon tube N 2
B' and C' are close to each other, and the potential difference therebetween is close to zero voltage. Therefore, in the case of reverse phase rotation, neon tube N 2
does not light up.
以上のことから、測定端子P1，P2，P3に三相
の交流電圧が接続されると、一相の電圧値が表示
されると共に、接続された三相電圧が測定端子
P1，P2，P3の順で位相が遅れているときはネオ
ン管N2が点灯し、正回転であることが分かる。 From the above, when three-phase AC voltage is connected to measurement terminals P 1 , P 2 , and P 3 , the voltage value of one phase is displayed, and the connected three-phase voltage is connected to measurement terminals P 1 , P 2 , and P 3.
When the phase is delayed in the order of P 1 , P 2 , and P 3 , the neon tube N 2 lights up, indicating that the rotation is normal.
又、ネオン管N2が点灯しないときは三相電圧
測定端子P1，P2，P3の順で回転していない（逆
相回転）ことを示すことになる。 Further, when the neon tube N2 does not light up, it indicates that the three-phase voltage measurement terminals P1 , P2 , and P3 are not rotating in this order (reverse phase rotation).
以上説明したように、この考案の相回転表示付
デジタル電圧計は、測定端子を３端子とし相回転
の検出回路網を組み込んであるので、三相交流電
圧を測定する場合は、相電圧をデジタル値によつ
て表示すると共に、相回転の方向をネオン管の点
滅によつて知ることができるという利点を有する
ものである。 As explained above, the digital voltmeter with phase rotation display of this invention has three measurement terminals and incorporates a phase rotation detection circuit network, so when measuring three-phase AC voltage, the phase voltage can be measured digitally. This has the advantage of not only displaying the value but also allowing the direction of phase rotation to be known by the blinking of the neon tube.
第１図はこの考案の相回転表示付デジタル電圧
計の回路図、第２図ａ，ｂは相回転検出回路網を
説明するためのベクトル図である。
図中、P1，P2，P3は測定端子、２は電源回路、
３は電圧分圧回路、４は基準電圧設定回路、５は
IC回路、６は表示器、８は相回転検出回路網、
N2はネオン管を示す。
FIG. 1 is a circuit diagram of the digital voltmeter with phase rotation display of this invention, and FIGS. 2a and 2b are vector diagrams for explaining the phase rotation detection circuit network. In the figure, P 1 , P 2 , P 3 are measurement terminals, 2 is a power supply circuit,
3 is a voltage divider circuit, 4 is a reference voltage setting circuit, and 5 is a voltage divider circuit.
IC circuit, 6 is a display, 8 is a phase rotation detection circuit network,
N 2 indicates a neon tube.
Claims (1)
回路に入力すると共に、前記電源回路の出力電圧
で駆動される集積回路によつて、前記電圧分圧回
路の出力電圧をデジタル信号に変換し、表示器に
よつて測定電圧を表示するようにしたデジタル電
圧計において、前記測定端子を３端子として相回
転検出回路網を接続し、被測定三相交流電圧が正
の相回転位相で測定端子に接続されたとき発光す
る発光源によつて、前記表示器の照明を行うよう
にしたことを特徴とする相回転表示付デジタル電
圧計。 inputting the voltage between the measurement terminals to a power supply circuit and a voltage divider circuit, and converting the output voltage of the voltage divider circuit into a digital signal by an integrated circuit driven by the output voltage of the power supply circuit; In a digital voltmeter in which the measured voltage is displayed by a display, a phase rotation detection circuit network is connected to the measurement terminal as three terminals, and the three-phase AC voltage to be measured is connected to the measurement terminal in a positive phase rotation phase. A digital voltmeter with a phase rotation display, characterized in that the display device is illuminated by a light emitting source that emits light when connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7348882U JPS58177878U (en) | 1982-05-21 | 1982-05-21 | Digital voltmeter with phase rotation display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7348882U JPS58177878U (en) | 1982-05-21 | 1982-05-21 | Digital voltmeter with phase rotation display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58177878U JPS58177878U (en) | 1983-11-28 |
| JPH044228Y2 true JPH044228Y2 (en) | 1992-02-07 |
Family
ID=30082996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7348882U Granted JPS58177878U (en) | 1982-05-21 | 1982-05-21 | Digital voltmeter with phase rotation display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58177878U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017133914A (en) * | 2016-01-27 | 2017-08-03 | 日置電機株式会社 | Measurement device |
| JP2017138118A (en) * | 2016-02-01 | 2017-08-10 | 日置電機株式会社 | Measurement device |
-
1982
- 1982-05-21 JP JP7348882U patent/JPS58177878U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58177878U (en) | 1983-11-28 |
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