JPH0485224U - - Google Patents
Info
- Publication number
- JPH0485224U JPH0485224U JP12773690U JP12773690U JPH0485224U JP H0485224 U JPH0485224 U JP H0485224U JP 12773690 U JP12773690 U JP 12773690U JP 12773690 U JP12773690 U JP 12773690U JP H0485224 U JPH0485224 U JP H0485224U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- circuit
- heater
- drive circuit
- sensor
- 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.)
- Granted
Links
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Measuring Volume Flow (AREA)
Description
第１図はこの考案の一実施例による流量センサ
駆動回路を示すブロツク図、第２図は従来の流量
センサ駆動回路の一例を示すブロツク図である。
１……電池、２……レギユレータ、３……ヒー
タ駆動回路、４ａ……上流側感温センサ、４ｂ…
…下流側感温センサ、４ｃ，４ｄ……直列抵抗、
４……センサブリツジ回路、５……差動増幅回路
、６……Ａ／Ｄ変換回路、８……シーケンス回路
。なお、図中、同一符号は同一、又は相当部分を
示す。
FIG. 1 is a block diagram showing a flow rate sensor drive circuit according to an embodiment of this invention, and FIG. 2 is a block diagram showing an example of a conventional flow rate sensor drive circuit. DESCRIPTION OF SYMBOLS 1...Battery, 2...Regulator, 3...Heater drive circuit, 4a...Upstream temperature sensor, 4b...
...Downstream temperature sensor, 4c, 4d...Series resistance,
4...Sensor bridge circuit, 5...Differential amplifier circuit, 6...A/D conversion circuit, 8...Sequence circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
温度変化に無関係にヒータを一定温度以内に制御
するヒータ駆動回路と、直列接続された上流側感
温センサと下流側感温センサとに並列に比較電圧
を発生する直列抵抗を接続したセンサブリツジ回
路と、上記レギユレータの出力電圧を抵抗で分割
した基準電圧により上記センサブリツジ回路の出
力の差動電圧であるアナログ信号をパルス信号に
変換するＡ／Ｄ変換回路と、外部からクロツク信
号を入力し、上記ヒータ駆動回路およびセンサブ
リツジ回路をオン・オフさせたり上記Ａ／Ｄ変換
回路のシーケンスを制御するシーケンス回路とを
備え、ヒータオン時のＡ／Ｄ変換出力とヒータオ
フの時のＡ／Ｄ変換出力との差を流量信号とする
流量センサ駆動回路において、上記ヒータ駆動回
路の電源を直接電池から取るように接続したこと
を特徴とする流量センサ駆動回路。 A regulator that makes the battery voltage a constant voltage, a heater drive circuit that controls the heater within a constant temperature regardless of changes in ambient temperature, and a comparison voltage that is connected in parallel to the upstream temperature sensor and downstream temperature sensor that are connected in series. a sensor bridge circuit connected with a series resistor that generates the voltage, and an A/D conversion circuit that converts an analog signal, which is a differential voltage of the output of the sensor bridge circuit, into a pulse signal using a reference voltage obtained by dividing the output voltage of the regulator by a resistor. , a sequence circuit that inputs a clock signal from the outside to turn on and off the heater drive circuit and sensor bridge circuit, and controls the sequence of the A/D conversion circuit, and outputs an A/D conversion output when the heater is on and when the heater is off. What is claimed is: 1. A flow rate sensor drive circuit that uses a difference between an A/D conversion output at a time and an A/D conversion output as a flow rate signal, characterized in that the heater drive circuit is connected so as to be powered directly from a battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12773690U JPH086269Y2 (en) | 1990-11-30 | 1990-11-30 | Flow sensor drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12773690U JPH086269Y2 (en) | 1990-11-30 | 1990-11-30 | Flow sensor drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0485224U true JPH0485224U (en) | 1992-07-24 |
| JPH086269Y2 JPH086269Y2 (en) | 1996-02-21 |
Family
ID=31875224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12773690U Expired - Lifetime JPH086269Y2 (en) | 1990-11-30 | 1990-11-30 | Flow sensor drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH086269Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013064624A (en) * | 2011-09-16 | 2013-04-11 | Mitsubishi Electric Corp | Thermal flow sensor for vehicles |
-
1990
- 1990-11-30 JP JP12773690U patent/JPH086269Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013064624A (en) * | 2011-09-16 | 2013-04-11 | Mitsubishi Electric Corp | Thermal flow sensor for vehicles |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH086269Y2 (en) | 1996-02-21 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |