JP2002131101A - Electromagnetic flowmeter - Google Patents

Electromagnetic flowmeter

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Publication number
JP2002131101A
JP2002131101A JP2000330007A JP2000330007A JP2002131101A JP 2002131101 A JP2002131101 A JP 2002131101A JP 2000330007 A JP2000330007 A JP 2000330007A JP 2000330007 A JP2000330007 A JP 2000330007A JP 2002131101 A JP2002131101 A JP 2002131101A
Authority
JP
Japan
Prior art keywords
voltage
battery
electromagnetic flowmeter
point
circuit
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.)
Pending
Application number
JP2000330007A
Other languages
Japanese (ja)
Inventor
Hiroyuki Imai
裕之 今井
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.)
Shimadzu Corp
Original Assignee
Shimadzu Corp
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 Shimadzu Corp filed Critical Shimadzu Corp
Priority to JP2000330007A priority Critical patent/JP2002131101A/en
Publication of JP2002131101A publication Critical patent/JP2002131101A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic flowmeter which can detect the voltage decrease of battery without reducing the life of battery by detection, in the case of using calibration machine utilizing the battery of electromagnetic flowmeter as a power source. SOLUTION: This invention is related to the electromagnetic flowmeter, which divides the voltage of batteries E1, E2 by resistance R4, R5 and R6, R7 and gives them to operation amplifier. On the other hand, the electromagnetic flowmeter flows exciting current ID to resistance R1, and gives the voltage meeeting this exciting current ID of the electromagnetic flowmeter as a standard voltage through diode D1, D2 to operation amplifieres OP1, OP2 and when the voltage (between a point and b point) meeting batteries E1, E2 becomes lower than the standard voltage of B point and C point, operation amplifiers outputs, swiching transistor Q1 turns on, current flows to lamp L, lamp L turns on and informs of detect of battery voltage.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は、校正器を有する
電磁流量計に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic flow meter having a calibrator.

【0002】[0002]

【従来の技術】電磁流量計の校正器の中には、電源とし
て電池を用いたものがある。この種の電磁流量計の校正
器では当然ながら、使用とともに電池の電圧が低下し、
電池の電圧がある値より下がると使用できなくなる。従
来の電磁流量計の校正器は、電池の電圧低下検知用に、
専用のICを用いている。この専用ICは、図3に示す
ように、電源VCCとアース間に抵抗R11、R12の
直列回路を接続し、抵抗R11、R12の接続中点をI
C1のVS端子に接続し、基準電圧を専用のICに加え
ている。この基準電圧と電池の電圧とをIC1内で比較
し、電池の電圧が所定値よりも小さくなると、電源VC
CからホトカプラPC11の発光素子を通してRESE
T端子に電流が流れ、ホトカプラPC11のホトトラン
ジスタをONし、ランプL11を点灯する。これによ
り、電池の電圧低下を報知する。
2. Description of the Related Art Some calibrators of an electromagnetic flowmeter use a battery as a power supply. Of course, with this type of calibrator for electromagnetic flowmeters, the battery voltage drops with use,
If the battery voltage falls below a certain value, it cannot be used. The conventional calibrator of the electromagnetic flow meter is used for detecting the battery voltage drop.
A dedicated IC is used. In this dedicated IC, as shown in FIG. 3, a series circuit of resistors R11 and R12 is connected between a power supply VCC and the ground, and a connection point between the resistors R11 and R12 is I.
The reference voltage is applied to a dedicated IC by connecting to the VS terminal of C1. The reference voltage and the battery voltage are compared in the IC 1, and when the battery voltage becomes smaller than a predetermined value, the power supply VC
C through the light emitting element of photocoupler PC11
A current flows through the T terminal to turn on the phototransistor of the photocoupler PC11 and turn on the lamp L11. Thereby, the battery voltage drop is notified.

【0003】[0003]

【発明が解決しようとする課題】上記した専用ICを用
いると、電池の電池低下を検知できる。しかしながら、
専用ICを用いると、専用ICを駆動する多くの電力が
必要となる。そのため、かえって電池の寿命を縮めると
いう問題がある。
When the above-mentioned dedicated IC is used, it is possible to detect a low battery. However,
When a dedicated IC is used, much power for driving the dedicated IC is required. Therefore, there is a problem that the life of the battery is shortened.

【0004】この発明は上記問題点に着目してなされた
ものであって、電池の寿命を縮めることなく、それでい
て電池の電圧低下を検知し得る校正器を有する電磁流量
計を提供することを目的としている。
The present invention has been made in view of the above problems, and has as its object to provide an electromagnetic flow meter having a calibrator capable of detecting a decrease in battery voltage without shortening the life of the battery. And

【0005】[0005]

【課題を解決するための手段】この発明の電磁流量計
は、電池を電源とした校正器を有し、この校正器が電磁
流量計の励磁信号を通電する回路手段と、この回路手段
に通電される励磁信号と電池電圧に応じた電源信号とを
比較する比較回路手段と、この比較回路手段の比較結果
に応じ、電磁電圧低下を出力する回路手段とを備えたも
のである。
SUMMARY OF THE INVENTION An electromagnetic flowmeter according to the present invention has a calibrator using a battery as a power source, the calibrator supplies a circuit for supplying an excitation signal of the electromagnetic flowmeter, and a power supply for the circuit. A comparison circuit means for comparing the excitation signal to be supplied with a power signal corresponding to the battery voltage, and a circuit means for outputting a decrease in the electromagnetic voltage according to the comparison result of the comparison circuit means.

【0006】この電磁流量計では、必ず校正器に入力さ
れる励磁信号が比較のための基準信号となる。電池の電
圧が低下してくると、電源信号が励磁信号よりも小とな
り、これに応じて電池の電圧低下を示す信号を出力す
る。
In this electromagnetic flow meter, the excitation signal always input to the calibrator serves as a reference signal for comparison. When the battery voltage decreases, the power supply signal becomes smaller than the excitation signal, and a signal indicating the battery voltage decrease is output accordingly.

【0007】[0007]

【発明の実施の形態】以下、実施の形態により、この発
明をさらに詳細に説明する。図1は、この発明の一実施
形態である電磁流量計の校正器の電圧低下検出回路を示
す回路接続図である。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to embodiments. FIG. 1 is a circuit connection diagram showing a voltage drop detection circuit of a calibrator of an electromagnetic flow meter according to an embodiment of the present invention.

【0008】図1において、電磁流量計の励磁回路に接
続される端子P1、P2間に抵抗R1が接続されてい
る。端子P1、P2が電磁流量計の励磁回路に接続され
ると、抵抗R1に励磁電流IDが流れる。抵抗R1の一
端は接地接続され、他端はダイオードD1、抵抗R2を
介して、マイクロパワーオペアンプOP1の入力の一端
に接続されている。また、端子P1に接続された抵抗R
1のこの一端は、ダイオードD1とは逆極性のダイオー
ドD2、抵抗R3を介してマイクロパワーオペアンプO
P2の入力の一端に接続されている。
In FIG. 1, a resistor R1 is connected between terminals P1 and P2 connected to an excitation circuit of an electromagnetic flowmeter. When the terminals P1 and P2 are connected to the excitation circuit of the electromagnetic flowmeter, an excitation current ID flows through the resistor R1. One end of the resistor R1 is grounded, and the other end is connected to one end of the input of the micropower operational amplifier OP1 via the diode D1 and the resistor R2. Further, the resistor R connected to the terminal P1
1 is connected to a diode D2 having a polarity opposite to that of the diode D1 and a micropower operational amplifier O via a resistor R3.
It is connected to one end of the input of P2.

【0009】抵抗R2とオペアンプOP1の入力の一端
との接続点と接地間には、コンデンサC1が、抵抗R3
とオペアンプOP2の入力の一端との接続点と接地間に
はコンデンサC2が、それぞれ接続されている。ここで
は、ダイオードD1と、抵抗R3と、コンデンサC1で
正極性の整流回路を、ダイオードD2と、抵抗R3と、
コンデンサC2で、負極性の整流回路を構成している。
A capacitor C1 is connected between the connection point between the resistor R2 and one end of the input of the operational amplifier OP1 and the ground.
Capacitors C2 are respectively connected between a connection point between the input terminal of the operational amplifier OP2 and one end of the operational amplifier OP2 and the ground. Here, a diode D1, a resistor R3, and a capacitor C1 form a positive rectifier circuit, and a diode D2, a resistor R3,
The capacitor C2 forms a rectifier circuit of negative polarity.

【0010】また、抵抗R4、R5、R6、R7が直列
に接続され、抵抗R4、R5に並列に抵抗R4側を正極
性とする電池E1が接続され、抵抗R6、R7に並列に
抵抗R6側を正極性とする電池E2が接続されいてる。
抵抗R5とR6の接続点は接地されている。電池E1と
E2は、その電圧が校正器の電源電圧(+電源〜−電
源)として使用される。抵抗R4とR5の接続点(a
点)がオペアンプOP1の他方の入力端に接続され、抵
抗R6とR7の接続点(b点)がオペアンプOP2の他
方の入力端に接続され、オペアンプOP1の入力の他端
には、電池E1の出力電圧に応じた電圧が、またオペア
ンプOP2の入力の他端には、電池E2の出力電圧に応
じた電圧がそれぞれ加えられるようになっている。
A resistor R4, R5, R6, and R7 are connected in series, a battery E1 having a positive polarity on the resistor R4 side is connected in parallel with the resistors R4 and R5, and a resistor R6 side is connected in parallel with the resistors R6 and R7. Is connected to a battery E2 having a positive polarity.
The connection point between the resistors R5 and R6 is grounded. The voltages of the batteries E1 and E2 are used as the power supply voltage (+ power supply to -power supply) of the calibrator. The connection point between the resistors R4 and R5 (a
) Is connected to the other input terminal of the operational amplifier OP1, the connection point (point b) between the resistors R6 and R7 is connected to the other input terminal of the operational amplifier OP2, and the other end of the input of the operational amplifier OP1 is connected to the battery E1. A voltage corresponding to the output voltage and a voltage corresponding to the output voltage of the battery E2 are applied to the other end of the input of the operational amplifier OP2.

【0011】以上の接続により、オペアンプOP1は、
正極性の励磁電流に応じた電圧と電池E1の出力電圧に
応じた電圧を比較し、オペアンプOP2は負極性の励磁
電流に応じた電圧と電池E2の出力電圧に応じた電圧を
比較するようになっている。オペアンプOP1の出力端
はダイオードD3を介して、スイッチングトランジスタ
Q1のベースに接続されている。また、オペアンプOP
2の出力端は、ダイオードD4を介してスイッチングト
ランジスタQ2のベースに接続されている。
With the above connection, the operational amplifier OP1
The operational amplifier OP2 compares the voltage according to the positive excitation current with the voltage according to the output voltage of the battery E1, and the operational amplifier OP2 compares the voltage according to the negative excitation current with the voltage according to the output voltage of the battery E2. Has become. The output terminal of the operational amplifier OP1 is connected to the base of the switching transistor Q1 via the diode D3. Also, the operational amplifier OP
2 is connected to the base of the switching transistor Q2 via a diode D4.

【0012】スイッチングトランジスタQ1、Q2のエ
ミッタは、いずれも接地接続され、コレクタは共通接続
されている。スイッチングトランジスタQ1、Q2のコ
ネクタと、+電源間には、抵抗R8とLEDなどのラン
プLの直列回路が接続されている。
The emitters of the switching transistors Q1 and Q2 are both grounded, and the collectors are commonly connected. A series circuit of a resistor R8 and a lamp L such as an LED is connected between the connectors of the switching transistors Q1 and Q2 and the + power supply.

【0013】次に、以上のように接続構成される実施形
態回路の動作を説明する。電磁流量計の励磁回路には、
規定上、図2の(a)に示すように、正、負交互の極性
のパルス電流、または図2の(b)に示すように、0、
正、0、負、0、……と間欠的に正、負交互の極性のパ
ルス電流が励磁電流として流される。したがって、実施
形態回路の端子P1、P2を電磁流量計の励磁回路に接
続すると、抵抗R1に励磁電流IDが流れる。そして、
図のA点の電圧波形は図2に示したのと同じ形状の波形
となる。このA点の電圧がダイオードD1、抵抗R1、
コンデンサC1で整流、平滑されて、正の直流電圧がオ
ペアンプOP1の入力の一端(B点)に加えられ、また
ダイオードD2、抵抗R3、コンデンサC2で整流、平
滑され、負の直流電圧がオペアンプOP2の入力の一端
(C点)に加えられる。オペアンプOP1、OP2の入
力の一端に加えられる電圧は、いずれも励磁電流に応じ
た電圧であり、比較のための基準電圧である。
Next, the operation of the embodiment circuit connected as described above will be described. In the excitation circuit of the electromagnetic flowmeter,
By definition, pulse currents of alternating positive and negative polarities as shown in FIG. 2A, or 0, as shown in FIG.
A positive, negative, intermittent pulse current of positive, negative, 0,... Alternately flows as an exciting current. Therefore, when the terminals P1 and P2 of the embodiment circuit are connected to the excitation circuit of the electromagnetic flowmeter, the excitation current ID flows through the resistor R1. And
The voltage waveform at point A in the figure has the same shape as that shown in FIG. The voltage at the point A is a diode D1, a resistor R1,
Rectified and smoothed by the capacitor C1, a positive DC voltage is applied to one end (point B) of the input of the operational amplifier OP1, and rectified and smoothed by the diode D2, the resistor R3 and the capacitor C2, and the negative DC voltage is converted to the operational amplifier OP2. At one end (point C). The voltage applied to one end of the inputs of the operational amplifiers OP1 and OP2 is a voltage corresponding to the exciting current, and is a reference voltage for comparison.

【0014】一方、電池E1の出力電圧は、抵抗R4と
R5で分圧されて、オペアンプOP1の入力の他端(a
点)に、また電池E2の出力電圧は抵抗R6とR7で分
圧されて、オペアンプOP2の入力の他端(b点)に加
えられている。
On the other hand, the output voltage of the battery E1 is divided by the resistors R4 and R5 and the other end (a) of the input of the operational amplifier OP1.
The output voltage of the battery E2 is divided by the resistors R6 and R7 and applied to the other end (point b) of the input of the operational amplifier OP2.

【0015】電池E1、E2が交換後、間もない場合で
は、出力電圧も大で、この場合は電池電圧に対応するa
点、b点の電圧(絶対値)値の方がB点、C点の基準電
圧よりも大であり、この場合、比較器としてのオペアン
プOP1、OP2は、いずれも出力を出さず、スイッチ
ングトランジスタQ1、Q2はOFFしたままであり、
したがってランプLに電流が流れず、点灯しない。
In the case where the batteries E1 and E2 are replaced shortly after replacement, the output voltage is large.
The voltages (absolute values) at points b and b are higher than the reference voltages at points B and C. In this case, the operational amplifiers OP1 and OP2 as comparators do not output any signal, and the switching transistors Q1 and Q2 remain OFF,
Therefore, no current flows through the lamp L and the lamp L does not light.

【0016】しかし、時間の経過により、回路の使用が
繰り返され、電池E1、E2の出力電圧が低下してく
る。やがて、電池電圧E1、E2の出力電圧が所定値以
下に低下すると、a点、b点の電圧がB点、C点の基準
電圧よりも低くなり、オペアンプOP1(あるいはオペ
アンプOP2)が出力を出す。この出力電圧により、ス
イッチングトランジスタQ1(Q2)がONし、ランプ
Lに電流が流れ、ランプLが点灯する。この点灯によっ
て電池電圧の低下を報知する。
However, the use of the circuit is repeated with the passage of time, and the output voltages of the batteries E1 and E2 decrease. Eventually, when the output voltages of the battery voltages E1 and E2 drop below a predetermined value, the voltages at the points a and b become lower than the reference voltages at the points B and C, and the operational amplifier OP1 (or the operational amplifier OP2) outputs. . With this output voltage, the switching transistor Q1 (Q2) is turned on, a current flows through the lamp L, and the lamp L is turned on. This lighting notifies the battery voltage drop.

【0017】[0017]

【発明の効果】この発明によれば、電磁流量計の励磁信
号を比較信号とし、校正器の電源である電池の電圧を比
較器で比較し、電池電圧低下を検出するものであるか
ら、基準信号は電磁流量計から得るものであり、特別の
専用IC等を使用することなく、しかも比較手段として
消費電力小のマイクロパワーオペアンプを使用すること
とすれば、電圧低下検出にほとんど電池の電力を使用す
ることなく、電源電池の長寿命化ができ、更に校正器を
長期にわたって使用できる。
According to the present invention, the excitation signal of the electromagnetic flowmeter is used as the comparison signal, and the voltage of the battery, which is the power supply of the calibrator, is compared with the comparator to detect the battery voltage drop. The signal is obtained from an electromagnetic flow meter.If a micropower operational amplifier with low power consumption is used as a comparison means without using a special dedicated IC, almost all of the battery power is used for detecting a voltage drop. Without use, the life of the power supply battery can be extended, and the calibrator can be used for a long time.

【図面の簡単な説明】[Brief description of the drawings]

【図1】この発明の一実施形態である電磁流量計の校正
器の電池電圧低下検出回路を示す回路図である。
FIG. 1 is a circuit diagram showing a battery voltage drop detection circuit of a calibrator of an electromagnetic flow meter according to an embodiment of the present invention.

【図2】電磁流量計の励磁電流の波形を示す図である。FIG. 2 is a diagram showing a waveform of an exciting current of an electromagnetic flowmeter.

【図3】従来の電池の電圧低下検出を説明する回路図で
ある。
FIG. 3 is a circuit diagram illustrating detection of a conventional battery voltage drop.

【符号の説明】[Explanation of symbols]

R1 励磁電流検出用抵抗 R4、R5、R6、R7 分圧抵抗 E1、E2 電池 OP1、OP2 マイクロパワーオペアンプ D1、D2、D3、D4 ダイオード Q1、Q2 スイッチングトランジスタ L 報知ランプ R1 Exciting current detecting resistor R4, R5, R6, R7 Voltage dividing resistor E1, E2 Battery OP1, OP2 Micro power operational amplifier D1, D2, D3, D4 Diode Q1, Q2 Switching transistor L Notification lamp

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】電池を電源とした校正器を有する電磁流量
計において、 前記校正器が電磁流量計の励磁信号を通電する回路手段
と、この回路手段に通電される励磁信号と電池電圧に応
じた電源信号とを比較する比較回路手段と、この比較回
路手段の比較結果に応じ、電池電圧低下を出力する回路
手段とを備えていることを特徴とする電磁流量計。
1. An electromagnetic flowmeter having a calibrator using a battery as a power source, wherein the calibrator supplies a circuit for energizing an excitation signal of the electromagnetic flowmeter, and a circuit in accordance with the excitation signal supplied to the circuit and a battery voltage. 1. An electromagnetic flowmeter comprising: comparison circuit means for comparing a detected power supply signal; and circuit means for outputting a battery voltage drop according to the comparison result of the comparison circuit means.
JP2000330007A 2000-10-30 2000-10-30 Electromagnetic flowmeter Pending JP2002131101A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000330007A JP2002131101A (en) 2000-10-30 2000-10-30 Electromagnetic flowmeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000330007A JP2002131101A (en) 2000-10-30 2000-10-30 Electromagnetic flowmeter

Publications (1)

Publication Number Publication Date
JP2002131101A true JP2002131101A (en) 2002-05-09

Family

ID=18806595

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000330007A Pending JP2002131101A (en) 2000-10-30 2000-10-30 Electromagnetic flowmeter

Country Status (1)

Country Link
JP (1) JP2002131101A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8042410B2 (en) 2006-05-19 2011-10-25 Endress + Hauser Flowtec Ag Magneto-inductive flow measuring device
CN105547382A (en) * 2014-10-28 2016-05-04 阿自倍尔株式会社 Standard signal generator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8042410B2 (en) 2006-05-19 2011-10-25 Endress + Hauser Flowtec Ag Magneto-inductive flow measuring device
CN105547382A (en) * 2014-10-28 2016-05-04 阿自倍尔株式会社 Standard signal generator
JP2016085150A (en) * 2014-10-28 2016-05-19 アズビル株式会社 Standard signal generator
CN105547382B (en) * 2014-10-28 2018-11-20 阿自倍尔株式会社 Reference generator

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