JPS6250601A - Pressure detecting device - Google Patents

Pressure detecting device

Info

Publication number
JPS6250601A
JPS6250601A JP18947685A JP18947685A JPS6250601A JP S6250601 A JPS6250601 A JP S6250601A JP 18947685 A JP18947685 A JP 18947685A JP 18947685 A JP18947685 A JP 18947685A JP S6250601 A JPS6250601 A JP S6250601A
Authority
JP
Japan
Prior art keywords
output
converter
pressure detection
voltage
reference voltage
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
JP18947685A
Other languages
Japanese (ja)
Inventor
Toshimasa Miyata
宮田 敏正
Tomiki Sakurai
桜井 止水城
Masayuki Ibe
井辺 雅之
Yasuyuki Chihara
千原 靖之
Hiroyuki Morinaga
森永 弘之
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.)
Panasonic Ecology Systems Co Ltd
Toyoda Koki KK
Original Assignee
Matsushita Seiko Co Ltd
Toyoda Koki KK
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 Matsushita Seiko Co Ltd, Toyoda Koki KK filed Critical Matsushita Seiko Co Ltd
Priority to JP18947685A priority Critical patent/JPS6250601A/en
Publication of JPS6250601A publication Critical patent/JPS6250601A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measuring Fluid Pressure (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Measurement Of Force In General (AREA)

Abstract

PURPOSE:To vary a reference voltage supplied to an A/D converter at the same ratio with the voltage of a power supply which is supplied to a pressure sensor and to eliminate errors in detection due to variance among parts by connecting a circuit for reference voltage generation to the power source which applies the voltage to the pressure sensor. CONSTITUTION:The output of a pressure detection part 1 which is affected directly by variation in source voltage has its amplification factor determined 5 and is amplified 3 and inputted to an A/D converter 12. The source voltage of the reference voltage generating circuit 8 to the A/D converter 12 is the same with a pressure detecting and amplifying part 10, so it is affected directly by the variation in source voltage as well. Consequently, the output of the A/D converter 12 is held constant regardless of the variation in source voltage. Its output is passed through a microcomputer 9 to supply various control signals to a load side. This constitution reduces errors due to variance among parts to obtain such a detecting device that the input of a pressure detection block corresponds to the A/D conversion output, one to one, at any time.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、圧力センサーにより流体等の圧力を電気的に
検出する装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for electrically detecting the pressure of a fluid or the like using a pressure sensor.

〈従来の技術〉 従来の技術を第2図に基づいて説明する。14は圧力検
出増幅部であり、その内部に圧力センサー20を有して
いる。前記圧力検出増幅部■4に供給される電源は、電
源安定化回路13により安定化されている。また、この
圧力検出増幅部14の出力は、接続線21によりアナロ
グ−デジタル変換器15(以下A/Dコンバータと称す
)に入力される。このA/Dコンバータ15には前記電
源安定化回路13より供給される電源電圧と、電圧安定
化回路16の出力から基準電圧を発生させる基準電圧発
生用回路17が接続されている。A/Dコンバータ15
の出力は、接続線22によりマイクロコンピュータ18
 (以下マイコンと称す)に接続されていて、検出した
圧力の分析を行う。
<Conventional technology> The conventional technology will be explained based on FIG. 2. 14 is a pressure detection amplification section, which has a pressure sensor 20 therein. The power supply supplied to the pressure detection amplification section (4) is stabilized by a power supply stabilization circuit 13. Further, the output of the pressure detection amplification section 14 is inputted to an analog-to-digital converter 15 (hereinafter referred to as an A/D converter) via a connecting line 21. A reference voltage generation circuit 17 that generates a reference voltage from the power supply voltage supplied from the power supply stabilization circuit 13 and the output of the voltage stabilization circuit 16 is connected to the A/D converter 15 . A/D converter 15
The output of
(hereinafter referred to as a microcomputer) and analyzes the detected pressure.

このような従来の構成において、圧力検出を行うために
は、圧力検出増幅部14の入出力とA/Dコンバータ1
5の入出力が全て1対1で対応するために、電源安定化
回路I3及び電圧安定化回路l6の精度を高<シ、電源
電圧の振れをA/Dコンバータ15の基準電圧に伝えな
いようにしていた。
In such a conventional configuration, in order to detect pressure, it is necessary to connect the input/output of the pressure detection amplifier 14 and the A/D converter 1.
In order to ensure a one-to-one correspondence between the inputs and outputs of 5, the precision of the power supply stabilizing circuit I3 and the voltage stabilizing circuit I6 is set to high, so that fluctuations in the power supply voltage are not transmitted to the reference voltage of the A/D converter 15. I was doing it.

〈発明が解決しようとする問題点〉 上記従来の構成において、各安定化回路を構成している
各部品がそれぞれもっている個々のバラツキによって、
圧力検出増幅部14に供給される電圧とA10コンバー
タ15の基準電圧が、必ずしも一定にはならず、また、
両電圧は異なった割合で変動する場合が多い。従って、
圧力検出増幅部14に入力される圧力とA/Dコンバー
タ15の出力が1対1に対応せず、マイコン18には誤
差を含んだ出力が入力されるという問題点がある。
<Problems to be Solved by the Invention> In the above conventional configuration, due to individual variations in each component making up each stabilizing circuit,
The voltage supplied to the pressure detection amplification section 14 and the reference voltage of the A10 converter 15 are not necessarily constant, and
Both voltages often vary at different rates. Therefore,
There is a problem in that the pressure input to the pressure detection amplification section 14 and the output of the A/D converter 15 do not correspond one-to-one, and the microcomputer 18 receives an output containing an error.

本発明は、部品のバラツキによる誤差をなくし、さらに
電源電圧の振れによるA/Dコンバータの基準電圧の振
れを吸収し、常に圧力検出ブロックの入力とA/ロコン
バータの出力が1対1に対応することを可能にした圧力
検出装置を提供することを目的とする。
The present invention eliminates errors caused by variations in components, absorbs fluctuations in the A/D converter reference voltage due to fluctuations in the power supply voltage, and always has a one-to-one correspondence between the input of the pressure detection block and the output of the A/D converter. The purpose of the present invention is to provide a pressure detection device that makes it possible to

〈問題点を解決するための手段〉 上記目的を達成するために本発明は、電源を接続された
圧力センサーにより構成されている圧力検出部と、前記
圧力検出部の出力に接続された増幅回路とより構成され
た圧力検出増幅部と、前記圧力検出増幅部の出力と接続
され、基準電圧発生用回路から基準電圧が供給されるア
ナログ−デジタル変換器と、前記アナログ−デジタル変
換器の出力に接続されたマイクロコンピュータとよりな
る圧力検出装置において、前記圧力センサーに供給され
る電源と同じ電源に前記基準電圧発生用回路を接続し、
圧力センサーに供給される電源の電圧と同じ割合でアナ
ログ−デジタル変換器に供給される基準電圧が変動する
ようにしたものである。
<Means for Solving the Problems> In order to achieve the above object, the present invention provides a pressure detection unit configured of a pressure sensor connected to a power source, and an amplifier circuit connected to the output of the pressure detection unit. an analog-to-digital converter connected to the output of the pressure detection amplification section and supplied with a reference voltage from a reference voltage generation circuit; In a pressure detection device comprising a connected microcomputer, the reference voltage generation circuit is connected to the same power source as the power source supplied to the pressure sensor,
The reference voltage supplied to the analog-to-digital converter varies at the same rate as the voltage of the power supply supplied to the pressure sensor.

〈作   用〉 本発明は、圧力センサーにより圧力に対応し出力された
電圧は、増幅回路により増幅されアナログ−デジタル変
換器へ送られる。また、アナログ−デジタル変換器の出
力はマイクロコンピュータべ入力され、マイクロコンピ
ュータから負荷側へ出力されるものである。
<Function> In the present invention, the voltage outputted by the pressure sensor corresponding to the pressure is amplified by the amplifier circuit and sent to the analog-digital converter. Further, the output of the analog-to-digital converter is inputted to the microcomputer, and outputted from the microcomputer to the load side.

く実 施 例〉 以下本発明の実施例を第1図に基づいて説明する。1は
圧力センサー19がブリッジ構成される圧力検出部であ
り、これには電流源2が接続されている。この圧力検出
部1の出力は、増幅率決定回路5が接続されている増幅
回路3に入力され、ここで増幅される。増幅回路3の出
力は接続線6によりアナログ−デジタル変換器12(以
下A/Dコンバータと称す)に接続される。
Embodiments Hereinafter, embodiments of the present invention will be described based on FIG. 1. Reference numeral 1 denotes a pressure detection section in which a pressure sensor 19 is configured as a bridge, and a current source 2 is connected to this. The output of this pressure detection section 1 is input to an amplification circuit 3 to which an amplification factor determination circuit 5 is connected, and is amplified there. The output of the amplifier circuit 3 is connected to an analog-to-digital converter 12 (hereinafter referred to as an A/D converter) via a connecting line 6.

このA/DコンバータJ2には、前記圧力検出部1と電
流源2と増幅率決定回路5と増幅回路3とより構成され
る圧力検出増幅部10に接続されて・  いる電源電圧
と同じ電源が供給されており、さらに、同じ電源を供給
されている基準電圧発生用回路8が接続されている。ま
た、A/Dコンバータ12の出力はマイクロコンピュー
タ9に接続されている。
This A/D converter J2 is connected to the same power supply voltage as the power supply voltage connected to the pressure detection amplification section 10, which is composed of the pressure detection section 1, the current source 2, the amplification factor determination circuit 5, and the amplification circuit 3. Further, a reference voltage generation circuit 8 which is supplied with the same power is connected. Further, the output of the A/D converter 12 is connected to the microcomputer 9.

本発明は上記の構成であるから、圧力センサ−19によ
り検出された圧力は、電流源2より受けた電流の電流値
と、圧力センサー19のもつ圧力に対応した抵抗値によ
り電圧に変換される。
Since the present invention has the above configuration, the pressure detected by the pressure sensor 19 is converted into voltage by the current value of the current received from the current source 2 and the resistance value of the pressure sensor 19 corresponding to the pressure. .

この電圧は、圧力センサー19がブリッジを形成してい
るため、a−b間の差圧となる。従って、電流源2が電
源電圧の娠れの影響を直接受けることから、圧力検出部
1の出力電圧Va−bも電源電圧の振れの影響を直接受
け、電源電圧変動と同じ割合で変動することになる。
Since the pressure sensor 19 forms a bridge, this voltage becomes a differential pressure between a and b. Therefore, since the current source 2 is directly affected by fluctuations in the power supply voltage, the output voltage Va-b of the pressure detection unit 1 is also directly affected by fluctuations in the power supply voltage, and fluctuates at the same rate as the fluctuations in the power supply voltage. become.

電源電圧の振れの影響を直接受けた圧力検出部1の出力
は、増幅率決定回路5により増幅率を定められた増幅回
路3により増幅され、電源電圧の振れの影響を直接受け
たまま圧力検出増幅部lOの出力としてA/Dコンバー
タ12へ入力される。
The output of the pressure detection unit 1, which is directly affected by fluctuations in the power supply voltage, is amplified by the amplification circuit 3 whose amplification factor is determined by the amplification factor determining circuit 5, and the pressure is detected while being directly affected by the fluctuations in the power supply voltage. It is input to the A/D converter 12 as the output of the amplification section IO.

A/Dコンバータ12の基準電圧発生用回路8の電源電
圧は、圧力検出増幅部lOの電源電圧と同じものである
ため、基準電圧発生用回路8も圧力検出増幅部lOと同
様に電源電圧の振れの影響を直接受けた基準電圧を出力
する。これによリ、電源電圧の変動により、圧力検出部
1の出力が変動すれば、A/Dコンバータ12に供給さ
れる基準電圧も同じ割合で変動し、A/Dコンバータ1
2の出力は電源電圧の変動にかかわらず一定に保たれる
。また、A/Dコンバータ12の出力は、マイクロコン
ピュータ9へ入力され、マイクロコンピュータ9から負
荷側へ各種制御信号を出力する。
Since the power supply voltage of the reference voltage generation circuit 8 of the A/D converter 12 is the same as the power supply voltage of the pressure detection amplification section 1O, the reference voltage generation circuit 8 also has the same power supply voltage as the pressure detection amplification section 1O. Outputs a reference voltage that is directly affected by vibration. Accordingly, if the output of the pressure detection section 1 fluctuates due to fluctuations in the power supply voltage, the reference voltage supplied to the A/D converter 12 also fluctuates at the same rate, and the A/D converter 1
The output of 2 is kept constant regardless of fluctuations in the power supply voltage. Further, the output of the A/D converter 12 is input to the microcomputer 9, and the microcomputer 9 outputs various control signals to the load side.

〈発明の効果〉 以上のように本発明によると、圧力検出部の出力が電源
電圧の振れの影響を受けて、アナログ−デジタル変換器
に入力されたとしてもアナログ−デジタル変換器の基準
電圧発生用回路も同じ影響を受けているためにアナログ
−デジタル変換器の出力は圧力検出増幅部の入力と対応
したものになる。すなわち、圧力検出増幅部の入出力は
、1対1の対応になり得ないが、従来の各安定回路がな
いために、部品のバラッ+b<なく、また、電源電圧の
撮れの影響も吸収してしまうため、圧力検出部の入力と
アナログ−デジタル変換器の出力を1対1に対応させる
ことができる効果を有している。
<Effects of the Invention> As described above, according to the present invention, even if the output of the pressure detection section is input to the analog-to-digital converter due to the influence of fluctuations in the power supply voltage, the reference voltage of the analog-to-digital converter cannot be generated. The output circuit of the analog-to-digital converter corresponds to the input of the pressure sensing amplifier because the circuit for the analog-to-digital converter is also affected by the same effect. In other words, the input and output of the pressure detection amplifier section cannot have a one-to-one correspondence, but since there is no conventional stabilizing circuit, there is no variation in parts, and the influence of the power supply voltage is absorbed. Therefore, the input of the pressure detection section and the output of the analog-to-digital converter can be made to correspond one-to-one.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例による圧力検出装置のブロッ
ク図、第2図は従来の圧力検出装置のブロック図である
。 1・・・圧力検出部、2・・・電流源、3・・・増幅回
路、5・・・増幅率決定回路、8・・・基準電圧発生用
回路、9・・・マイクロコンピュータ、IO・・・圧力
検出増幅部、12・・・アナログ−デジタル変換器、1
9・・・圧力センサー。
FIG. 1 is a block diagram of a pressure detection device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional pressure detection device. DESCRIPTION OF SYMBOLS 1... Pressure detection part, 2... Current source, 3... Amplification circuit, 5... Amplification factor determination circuit, 8... Reference voltage generation circuit, 9... Microcomputer, IO. ...Pressure detection amplification section, 12...Analog-digital converter, 1
9...Pressure sensor.

Claims (1)

【特許請求の範囲】[Claims] 電源を接続された圧力センサーにより構成されている圧
力検出部と、前記圧力検出部の出力に接続された増幅回
路とより構成された圧力検出増幅部と、前記圧力検出増
幅部の出力と接続され、基準電圧発生用回路から基準電
圧が供給されるアナログ−デジタル変換器と、前記アナ
ログ−デジタル変換器の出力に接続されたマイクロコン
ピュータとよりなる圧力検出装置において、前記圧力セ
ンサーに供給される電源と同じ電源に前記基準電圧発生
用回路を接続し、圧力センサーに供給される電源の電圧
と同じ割合でアナログ−デジタル変換器に供給される基
準電圧が変動するようにした圧力検出装置。
a pressure detection section including a pressure sensor connected to a power source; a pressure detection amplification section including an amplifier circuit connected to the output of the pressure detection section; , a pressure detection device comprising an analog-to-digital converter to which a reference voltage is supplied from a reference voltage generation circuit, and a microcomputer connected to the output of the analog-to-digital converter; The reference voltage generating circuit is connected to the same power supply as the pressure sensor, and the reference voltage supplied to the analog-to-digital converter varies at the same rate as the voltage of the power supply supplied to the pressure sensor.
JP18947685A 1985-08-30 1985-08-30 Pressure detecting device Pending JPS6250601A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18947685A JPS6250601A (en) 1985-08-30 1985-08-30 Pressure detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18947685A JPS6250601A (en) 1985-08-30 1985-08-30 Pressure detecting device

Publications (1)

Publication Number Publication Date
JPS6250601A true JPS6250601A (en) 1987-03-05

Family

ID=16241896

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18947685A Pending JPS6250601A (en) 1985-08-30 1985-08-30 Pressure detecting device

Country Status (1)

Country Link
JP (1) JPS6250601A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006014453A (en) * 2004-06-24 2006-01-12 Denso Corp Cooling controller for two-power supply type battery loading vehicle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5750011B2 (en) * 1977-08-29 1982-10-25
JPS5952464B2 (en) * 1980-07-31 1984-12-19 富士通株式会社 Data buffer control method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5750011B2 (en) * 1977-08-29 1982-10-25
JPS5952464B2 (en) * 1980-07-31 1984-12-19 富士通株式会社 Data buffer control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006014453A (en) * 2004-06-24 2006-01-12 Denso Corp Cooling controller for two-power supply type battery loading vehicle

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