JPH0814514B2 - Temperature detectors for combustion heaters - Google Patents
Temperature detectors for combustion heatersInfo
- Publication number
- JPH0814514B2 JPH0814514B2 JP1031776A JP3177689A JPH0814514B2 JP H0814514 B2 JPH0814514 B2 JP H0814514B2 JP 1031776 A JP1031776 A JP 1031776A JP 3177689 A JP3177689 A JP 3177689A JP H0814514 B2 JPH0814514 B2 JP H0814514B2
- Authority
- JP
- Japan
- Prior art keywords
- reference voltage
- voltage
- temperature detection
- temperature
- range
- 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 - Lifetime
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 11
- 238000001514 detection method Methods 0.000 claims description 29
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 238000009529 body temperature measurement Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
- Control Of Combustion (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、石油ファンヒーター、ガス給湯器等の燃焼
器具における温度検出装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature detecting device for a combustion appliance such as an oil fan heater and a gas water heater.
従来の技術 従来から、この種の温度検出装置として、第２図に示
すような、サーミスタ等の温度検出素子21と、前記温度
検出素子の端子電圧をディジタル値へ変換するA/D変換
部22と、中央制御装置23とを備え、前記ディジタル値に
基づいて、中央制御装置23が、表示素子25、モータ26等
を制御する構成が用いられている。A/D変換部22におい
ては、基準電圧入力部27へ供給された基準電圧が、ｎ段
階に分圧され、比較器28へ供給される。温度検出素子21
の端子電圧と各分圧とを逐次、比較することによって、
上記端子電圧がｎビットのディジタル値に変換される。2. Description of the Related Art Conventionally, as this type of temperature detecting device, as shown in FIG. 2, a temperature detecting element 21 such as a thermistor and an A / D converter 22 for converting a terminal voltage of the temperature detecting element into a digital value. And a central controller 23, and the central controller 23 controls the display element 25, the motor 26, etc. based on the digital value. In the A / D conversion unit 22, the reference voltage supplied to the reference voltage input unit 27 is divided into n levels and supplied to the comparator 28. Temperature detection element 21
By sequentially comparing the terminal voltage and each partial voltage of
The terminal voltage is converted into an n-bit digital value.
一般に、上記ビット数が多い程、高価になるため、燃
焼暖房機等に於けるA/D変換部には、変換ビット数が８
ビットまでのものが多く用いられている。Generally, the larger the number of bits is, the more expensive it is. Therefore, the number of conversion bits is 8 in the A / D converter in a combustion heater or the like.
Bits up to a lot are used.
発明が解決しようとする課題 しかしながら上記のような構成では、細かい単位で温
度検出を行なえば、検出できる温度範囲が狭くなり、逆
に広い温度範囲を検出しようとすれば、検出する温度の
単位が粗くなる。燃焼暖房機においては、室温表示や燃
焼制御のために、温度検出を行なっているが、室温表示
には、比較的広い温度範囲が必要であり、一方、燃焼制
御には、近年の技術向上に伴ない、より細かい単位での
温度検出が要求されるようになってきた。従って、上記
のような構成では、室温表示のための温度検出と、燃焼
制御のための温度検出とを兼用した場合、燃焼制御で要
求される、より細かい単位での温度検出に充分対応でき
ないという課題が生じてきた。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described configuration, if temperature detection is performed in a fine unit, the temperature range that can be detected is narrowed. It becomes coarse. In the combustion heater, temperature detection is performed for room temperature display and combustion control, but a relatively wide temperature range is required for room temperature display, while combustion control is an improvement in technology in recent years. Accompanying this, it has become necessary to detect temperature in smaller units. Therefore, in the above-mentioned configuration, when the temperature detection for room temperature display and the temperature detection for combustion control are combined, it is not possible to sufficiently cope with the temperature detection in finer units required for combustion control. Challenges have arisen.
本発明は、かかる課題を解消するもので、室温表示等
の広い温度検出範囲を確保するとともに、その一部の領
域において、燃焼制御等に必要な細かい単位での温度検
出を可能にすることを目的としたものである。The present invention solves such a problem, and secures a wide temperature detection range such as room temperature display and enables temperature detection in a small unit necessary for combustion control and the like in a part of the area. It is intended.
課題を解決するための手段 上記課題を解決するために、本発明の温度検出装置
は、サーミスタ等の温度検出素子と前記温度検出素子の
端子間電圧をディジタル値に変換するA/D変換部と、設
定された電圧範囲を、上記A/D変換器に入力される温度
検出素子の端子間電圧の最大範囲と見なして、前記A/D
変換部への入力電圧を０から最大値のディジタル値に変
換する際の基準となる基準電圧入力部と、上記基準電圧
入力部に設定する電圧範囲を切り変える基準電圧切変え
部とを備えた構成とし、検出目的に応じて、中央制御装
置からの指令によって基準電圧入力部に設定する電圧範
囲を切変えられるようにしている。Means for Solving the Problems In order to solve the above problems, the temperature detection device of the present invention is a temperature detection element such as a thermistor and an A / D conversion unit for converting the terminal voltage of the temperature detection element into a digital value. , The set voltage range is regarded as the maximum range of the voltage between the terminals of the temperature detection element input to the A / D converter, and the A / D
A reference voltage input section serving as a reference when converting an input voltage to the conversion section from 0 to a maximum digital value, and a reference voltage switching section for switching a voltage range set in the reference voltage input section are provided. According to the detection purpose, the voltage range set in the reference voltage input section can be switched by a command from the central control unit.
作用 本発明は、上記構成によって、中央制御装置より、基
準電圧切変え部に対して、A/D変換部の基準電圧入力部
へ供給する基準電圧を大きくする指令を出すと、サーミ
スタ等の温度検出素子の端子電圧が、広い範囲でA/D変
換される。逆に、中央制御装置より、基準電圧切変え部
に対して、A/D変換部の基準電圧入力部へ供給する基準
電圧を小さくする指令を出すと、サーミスタ等の温度検
出素子の端子電圧が、範囲は狭くなるが、細い単位でA/
D変換される。Action The present invention, by the above configuration, when the central control unit issues a command to the reference voltage switching unit to increase the reference voltage supplied to the reference voltage input unit of the A / D conversion unit, the temperature of the thermistor or the like is changed. The terminal voltage of the detection element is A / D converted in a wide range. Conversely, if the central control unit issues a command to the reference voltage switching unit to reduce the reference voltage supplied to the reference voltage input unit of the A / D conversion unit, the terminal voltage of the temperature detection element such as the thermistor will change. , The range becomes narrower, but A /
D converted.
実施例 以下、本発明の実施例を添付図面にもとづいて説明す
る。第１図において、１はサーミスタ等の温度検出素子
で、この端子間電圧をA/D変換部２によってディジタル
値に変換し、中央制御装置３へ伝える。中央制御装置３
は、この値に基づいて、表示素子15や、モータ16等を制
御する。そして、A/D変換部２は基準電圧入力部17へ供
給された基準電圧が、ｎ段階に分圧され比較器18へ供給
される。そして、この各分圧と温度検出素子１の端子電
圧とを逐次、比較することによって、上記端子電圧がｎ
ビットのディジタル値に変換される。４は基準電圧切変
え部で、中央制御装置３は、A/D変換部２を起動する前
に、その検出目的に応じて基準電圧切変え部４に対して
基準電圧を選択する指令を出す。すなわち、広い範囲で
の温度検出をする場合は、中央制御装置３より低レベル
の信号が出力され、トランジスタ５及び６がONして、コ
ンデンサ７の端子間電圧は、電源電圧Vccよりトランジ
スタ５及び６のコレクタ，エミッタ間飽和電圧を差し引
いた値となる。一方、温度検出範囲は、狭くなるが、細
かい単位で温度検出する場合は、中央制御装置３より高
レベルの信号が出力され、トランジスタ５及び６がOFF
し、コンデンサ７の端子間電圧は、電源電圧Vccを抵抗
8,9及び10にて分割した値、すなわち、 となる。Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 1 is a temperature detecting element such as a thermistor, which converts the voltage between the terminals into a digital value by an A / D converter 2 and transmits it to a central controller 3. Central controller 3
Controls the display element 15, the motor 16 and the like based on this value. Then, in the A / D conversion unit 2, the reference voltage supplied to the reference voltage input unit 17 is divided into n levels and supplied to the comparator 18. Then, by sequentially comparing each of the divided voltages and the terminal voltage of the temperature detection element 1, the terminal voltage is n.
Converted to a digital value of bits. Reference numeral 4 is a reference voltage switching unit, and the central control unit 3 issues a command for selecting a reference voltage to the reference voltage switching unit 4 according to the detection purpose before activating the A / D conversion unit 2. . That is, when the temperature is detected in a wide range, a low level signal is output from the central control unit 3, the transistors 5 and 6 are turned on, and the voltage between the terminals of the capacitor 7 is lower than the power supply voltage V cc. The value obtained by subtracting the saturation voltage between the collector and the emitter of 6 and 6. On the other hand, although the temperature detection range is narrowed, when the temperature is detected in small units, a high level signal is output from the central control unit 3 and the transistors 5 and 6 are turned off.
The voltage across the terminals of the capacitor 7 is the resistance of the power supply voltage V cc .
The value divided by 8, 9 and 10, that is, Becomes
上記の如く、中央制御装置３の指令によって、A/D変換
部２の基準電圧入力部17へ供給する基準電圧を切変える
ことができる。As described above, the reference voltage supplied to the reference voltage input unit 17 of the A / D conversion unit 2 can be switched by the command of the central control unit 3.
発明の効果 以上のように本発明の温度検出装置は、A/D変換部へ
供給する基準電圧が、検出目的に応じて切変えられるの
で、室温表示等の広い範囲の温度検出と、燃焼制御用の
検出範囲は狭くなるが細かい単位での温度検出とが、一
つの装置で実現できるという利点が得られる。また、A/
D変換部の基準電圧入力部に設定する電圧範囲を切り変
えるだけで温度測定の分解能を上げることが出来るの
で、サーミスタ等の温度検出素子からの信号をアナログ
信号増幅器を用いずに直接A/D変換部に入力することも
可能になり、構成が非常に簡単になる。さらに、高価
な、変換ビット数の多いA/D変換部を用いなくても温度
測定の分解能を上げることが出来るので、安価な温度検
出装置を提供できるという効果も得られる。Effects of the Invention As described above, the temperature detection device of the present invention, the reference voltage supplied to the A / D conversion unit is switched according to the detection purpose, so that a wide range of temperature detection such as room temperature display, combustion control Although the detection range for use is narrowed, there is an advantage that the temperature detection in fine units can be realized by one device. Also, A /
Since the resolution of temperature measurement can be improved simply by changing the voltage range set in the reference voltage input section of the D conversion section, the signal from the temperature detection element such as the thermistor can be directly A / D converted without using an analog signal amplifier. It is also possible to input to the conversion unit, which greatly simplifies the configuration. Further, since it is possible to increase the temperature measurement resolution without using an expensive A / D converter having a large number of conversion bits, it is possible to provide an inexpensive temperature detecting device.
第１図は、本発明の一実施例における温度検出装置の回
路図、第２図は従来の温度検出装置の回路図である。 １……温度検出素子、２……A/D変換部、３……中央制
御装置、４……基準電圧切変え部。FIG. 1 is a circuit diagram of a temperature detecting device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional temperature detecting device. 1 ... Temperature detection element, 2 ... A / D converter, 3 ... Central control unit, 4 ... Reference voltage switching section.
Claims (1)
検出素子の端子間電圧をディジタル値に変換するA/D変
換部と、設定された電圧範囲を、上記A/D変換部に入力
される温度検出素子の端子間電圧の最大範囲と見なし
て、前記A/D変換部への入力電圧を０から最大値のディ
ジタル値に変換する際の基準となる基準電圧入力部と、
前記A/D変換部から、上記ディジタル値を読み取り、そ
の値に基づいて、表示素子、モータ等を制御する中央制
御装置と、上記基準電圧入力部に設定する電圧範囲を切
変える基準電圧切変え部とを備え、上記中央制御装置か
らの指令によって、上記基準電圧入力部に設定する基準
電圧を切変えられることを特徴とする燃焼暖房機等の温
度検出装置。1. A temperature detection element such as a thermistor, an A / D conversion section for converting a voltage between terminals of the temperature detection element into a digital value, and a set voltage range is input to the A / D conversion section. And a reference voltage input section serving as a reference when converting the input voltage to the A / D conversion section from 0 to the maximum digital value, considering the maximum range of the voltage between terminals of the temperature detection element,
From the A / D conversion unit, the digital value is read, and based on the value, a central control device that controls the display element, the motor, and the like, and a reference voltage switching that switches the voltage range set in the reference voltage input unit. And a temperature detection device for a combustion heater or the like, wherein a reference voltage set in the reference voltage input part can be switched by a command from the central control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1031776A JPH0814514B2 (en) | 1989-02-10 | 1989-02-10 | Temperature detectors for combustion heaters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1031776A JPH0814514B2 (en) | 1989-02-10 | 1989-02-10 | Temperature detectors for combustion heaters |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02210232A JPH02210232A (en) | 1990-08-21 |
| JPH0814514B2 true JPH0814514B2 (en) | 1996-02-14 |
Family
ID=12340456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1031776A Expired - Lifetime JPH0814514B2 (en) | 1989-02-10 | 1989-02-10 | Temperature detectors for combustion heaters |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0814514B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0545232A (en) * | 1991-08-19 | 1993-02-23 | Zexel Corp | Temperature sensing device |
| JP2008170074A (en) * | 2007-01-12 | 2008-07-24 | Fujitsu General Ltd | Electronic equipment with sensor circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5945926B2 (en) * | 1979-03-30 | 1984-11-09 | 三洋電機株式会社 | temperature measuring device |
| JPS55476A (en) * | 1979-04-09 | 1980-01-05 | Seiko Epson Corp | Digital thermometer |
| JPS5858429A (en) * | 1981-09-30 | 1983-04-07 | Matsushita Electric Works Ltd | Electronic thermometer |
| JPS6415622A (en) * | 1987-07-09 | 1989-01-19 | Ricoh Kk | Measuring method for temperature |
-
1989
- 1989-02-10 JP JP1031776A patent/JPH0814514B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02210232A (en) | 1990-08-21 |
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