JP3303323B2 - Temperature control device - Google Patents
Temperature control deviceInfo
- Publication number
- JP3303323B2 JP3303323B2 JP03747892A JP3747892A JP3303323B2 JP 3303323 B2 JP3303323 B2 JP 3303323B2 JP 03747892 A JP03747892 A JP 03747892A JP 3747892 A JP3747892 A JP 3747892A JP 3303323 B2 JP3303323 B2 JP 3303323B2
- Authority
- JP
- Japan
- Prior art keywords
- heater
- temperature
- unit
- signal
- temperature detection
- 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 - Fee Related
Links
Landscapes
- Control Of Resistance Heating (AREA)
- Control Of Temperature (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電気カーペット、電気
ストーブ、電気毛布等の電気暖房器具の温度制御装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device for an electric heater such as an electric carpet, an electric stove and an electric blanket.
【０００２】[0002]
【従来の技術】従来のこの種の温度制御装置を図３を参
照しながら説明する。１はヒータ、２はヒータ１の近傍
の温度を検出する温度検出部で、温度検出信号を発生
し、通常はサーミスタなどの感温素子にて電圧値として
温度を検出する。３は所望の温度を設定する温度設定部
である。４は温度検出部２の検出温度と温度設定部３の
設定温度を比較する比較部である。５はヒータ駆動部
で、電気カーペットのように大電力の温度制御装置では
リレーを用いるのが一般的である。６は比較部４におい
て温度検出部２にて検出した検出温度が温度設定部３に
て設定された設定温度よりも低いことが検出されたと
き、ヒータ駆動部５にてヒータ１を駆動する制御部であ
る。いったん検出温度が設定温度よりも大きくなると
（検出温度≧設定温度）制御温度にヒステリシスを設
け、リレーのようなヒータ駆動部５の接点寿命をも考慮
して制御している。2. Description of the Related Art A conventional temperature controller of this type will be described with reference to FIG. Reference numeral 1 denotes a heater, and reference numeral 2 denotes a temperature detection unit for detecting a temperature near the heater 1, which generates a temperature detection signal. The temperature is usually detected as a voltage value by a temperature sensing element such as a thermistor. Reference numeral 3 denotes a temperature setting unit for setting a desired temperature. Reference numeral 4 denotes a comparison unit that compares the temperature detected by the temperature detection unit 2 with the temperature set by the temperature setting unit 3. Reference numeral 5 denotes a heater drive unit, which generally uses a relay in a high-power temperature control device such as an electric carpet. Reference numeral 6 denotes a control for driving the heater 1 by the heater driving unit 5 when the comparing unit 4 detects that the detected temperature detected by the temperature detecting unit 2 is lower than the set temperature set by the temperature setting unit 3. Department. Once the detected temperature becomes higher than the set temperature (detected temperature ≧ set temperature), a hysteresis is provided for the control temperature, and control is performed in consideration of the contact life of the heater drive unit 5 such as a relay.
【０００３】近ごろのマイクロコンピュータ（以後、マ
イコンという）技術の発達によってアナログ−ディジタ
ル変換器（以後、Ａ／Ｄ変換器という）を有するマイコ
ンが比較的安価で供給されてきており、これら電気カー
ペット等の電気暖房器具においても温度制御に際し、比
較部４はマイコンのＡ／Ｄ変換器を用いて構成すること
が多くなってきている。比較部４は温度検出部２の温度
検出信号をＡ／Ｄ変換するＡ／Ｄ変換器４−１と温度設
定部３の設定温度信号をＡ／Ｄ変換するＡ／Ｄ変換器４
−２、および、Ａ／Ｄ変換器４−１にてＡ／Ｄ変換され
た値（Ａ／Ｄ変換値）を格納する格納レジスタ４−１−
１と、Ａ／Ｄ変換器４−２にてＡ／Ｄ変換された値（Ａ
／Ｄ変換値）を格納する格納レジスタ４−２−１と、格
納レジスカ４−１−１のＡ／Ｄ変換値と格納レジスタ４
−２−１のＡ／Ｄ変換値を比較する比較器４−３を有し
ており、比較器４−３にて比較された結果を制御部６に
出力する。なお、図４にＡ／Ｄ変換器４−１，４−２を
一つにして入力信号を切り換え、Ａ／Ｄ変換値をそれぞ
れのＡ／Ｄ変換入力信号（温度検出信号、温度設定信
号）の格納レジスタ４−１−１，４−２−１に格納し、
比較器４−３にて比較する比較部４の今一つの例のブロ
ック図を示す。With the recent development of microcomputer technology, microcomputers having analog-digital converters (hereinafter A / D converters) have been supplied at relatively low prices. For the temperature control in the electric heater of the above, the comparison unit 4 is often configured using an A / D converter of a microcomputer. The comparing unit 4 includes an A / D converter 4-1 for A / D converting the temperature detection signal of the temperature detecting unit 2 and an A / D converter 4 for A / D converting the set temperature signal of the temperature setting unit 3.
-2 and a storage register 4-1 for storing a value A / D converted by the A / D converter 4-1 (A / D converted value)
1 and the value A / D converted by the A / D converter 4-2 (A
/ D conversion value), an A / D conversion value of storage register 4-1-1 and storage register 4-1.
It has a comparator 4-3 for comparing the A / D converted value of -2-1, and outputs the result of comparison by the comparator 4-3 to the control unit 6. In FIG. 4, the A / D converters 4-1 and 4-2 are combined into one to switch the input signal, and the A / D conversion value is converted to the respective A / D conversion input signal (temperature detection signal, temperature setting signal). In the storage registers 4-1-1 and 4-2-1 of
FIG. 9 is a block diagram showing another example of the comparison unit 4 for comparison by the comparator 4-3.
【０００４】制御部６では温度検出部２の温度検出信号
を比較部４のＡ／Ｄ変換器４−１にて変換された出力値
（Ａ／Ｄ変換値）が一定の範囲内にあることを検出して
この領域は温度検出部２の開放／短絡検出用として定義
しこの領域にＡ／Ｄ変換値がある場合は、温度検出部２
が開放／短絡したと判定しヒータ１をオフするためにヒ
ータ駆動部５を停止するといういわゆる３値制御を行な
っている。In the control unit 6, the output value (A / D converted value) obtained by converting the temperature detection signal of the temperature detection unit 2 by the A / D converter 4-1 of the comparison unit 4 is within a certain range. And this area is defined for detecting the open / short circuit of the temperature detection unit 2. If there is an A / D conversion value in this area, the temperature detection unit 2
Is turned off / short-circuited, and so-called ternary control is performed in which the heater driving unit 5 is stopped to turn off the heater 1.
【０００５】図５に従来の温度制御装置における時間−
温度特性図を示す。温度設定部３にて設定された設定温
度に温度検出部２にて検出された検出温度が到達したな
らばヒータ１をオフする。ヒータ１がオフするとヒータ
１がオンのときの設定温度よりも低い温度に設定温度を
下げヒステリシスを設けている。また、図６に示すよう
に第１タイマがタイムアップするまでに設定温度に到達
しないときは第１タイマがタイムアップした時点でヒー
タ１はオフする。第２タイマがタイムアップするまでに
設定温度（ヒータ１がオフしているときは設定温度は
“設定温度−ヒステリシス”）に到達したときは第２タ
イマがタイムアップするまでヒータ１はオフを継続す
る。比較部４の格納レジスタ４−１−１，４−２−１が
故障して、Ａ／Ｄ変換器４−１，４−２の動作にかかわ
らず固定したときは実際の温度が設定温度に到達したと
してもＡ／Ｄ変換値は固定しているので温度は上昇し続
ける。図７に比較部４が故障したとき（格納レジスタ４
−１−１，４−２−１が温度設定以下のＡ／Ｄ変換値で
固定）の第１および第２タイマによる温度−時間特性図
を示す。温度検出部２の開放／短絡検出領域以外の領域
では温度検出部２の故障は検出できずヒータ１を制御部
６にてオン／オフ制御する。また、この領域にてＡ／Ｄ
変換器４−１，４−２が故障してＡ／Ｄ変換値が固定し
てしまったときにも制御部６ではＡ／Ｄ変換器４−１，
４−２の故障は検出できず、あたかもＡ／Ｄ変換器４−
１，４−２が正常動作をしているかのようにオン／オフ
制御をする。すなわち格納レジスタ４−１−１，４−２
−１が温度設定値以下に固定したときは第１タイマがタ
イムアップするまでヒータ１はオンを継続する。第１タ
イマがタイムアップした時点でヒータ１はオフする。ヒ
ータ１のオフは第２タイマがタイムアップするまで継続
される。第２タイマがタイムアップした時点で再びヒー
タ１はオンする。以後この状態を繰り返しヒータの温度
は上昇し続ける。[0005] FIG. 5 shows time in a conventional temperature control device.
The temperature characteristic diagram is shown. When the temperature detected by the temperature detecting section 2 reaches the set temperature set by the temperature setting section 3, the heater 1 is turned off. When the heater 1 is turned off, the set temperature is lowered to a temperature lower than the set temperature when the heater 1 is turned on, and a hysteresis is provided. As shown in FIG. 6, when the set temperature is not reached before the first timer expires, the heater 1 is turned off when the first timer expires. When the set temperature is reached before the second timer expires (when the heater 1 is off, the set temperature is "set temperature-hysteresis"), the heater 1 continues to be turned off until the second timer expires I do. When the storage registers 4-1-1 and 4-2-1 of the comparison unit 4 fail and are fixed regardless of the operation of the A / D converters 4-1 and 4-2, the actual temperature becomes the set temperature. Even if it reaches, the temperature keeps increasing because the A / D conversion value is fixed. FIG. 7 shows a case where the comparison unit 4 fails (the storage register 4
(1-1-1 and 4-2-1 are fixed at A / D conversion values equal to or lower than the temperature setting). FIG. In the area other than the open / short detection area of the temperature detecting section 2, a failure of the temperature detecting section 2 cannot be detected, and the control section 6 controls the heater 1 to be turned on / off. In this area, A / D
The control unit 6 also controls the A / D converters 4-1 and 4-1 when the converters 4-1 and 4-2 fail and the A / D conversion values are fixed.
4-2 cannot be detected, as if the A / D converter 4-
The on / off control is performed as if 1,4-2 were operating normally. That is, the storage registers 4-1-1 and 4-2
When −1 is fixed below the temperature set value, the heater 1 continues to be turned on until the first timer times out. When the time of the first timer expires, the heater 1 is turned off. The heater 1 is kept off until the second timer times out. When the second timer times out, the heater 1 is turned on again. Thereafter, this state is repeated, and the temperature of the heater continues to rise.
【０００６】[0006]
【発明が解決しようとする課題】上記のような構成で
は、以下に示す課題を有していた。従来のように一定範
囲内のＡ／Ｄ変換値のみを有効とする方法では、Ａ／Ｄ
変換値が一定範囲内の領域にて故障（多くは温度検出部
の温度検出信号にかかわらずＡ／Ｄ変換値が一定となっ
てしまうような故障）した場合、このような故障を検出
することができず実際の温度検出部の検出温度は上昇し
ているにもかかわらず設定温度に到達したと判定できな
いため、火災や火傷などの不安全動作を引き起こす可能
性がある。The above configuration has the following problems. In the conventional method of validating only the A / D conversion value within a certain range, the A / D
In the case where a failure occurs in a region where the conversion value is within a certain range (in most cases, a failure in which the A / D conversion value becomes constant regardless of the temperature detection signal of the temperature detection unit), such a failure is detected. However, since it is not possible to determine that the temperature has reached the set temperature despite the fact that the temperature detected by the actual temperature detecting section has risen, an unsafe operation such as a fire or a burn may occur.
【０００７】本発明はこのような課題を解決するもの
で、温度検出動作の故障に対して安全な温度制御装置の
提供を目的とする。An object of the present invention is to solve such a problem, and an object of the present invention is to provide a temperature control device which is safe against a failure in a temperature detection operation.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明の温度制御装置は、ヒータと、ヒータを駆動
するヒータ駆動部と、ヒータと熱的に結合した温度検出
部と、ヒータを所望の温度に設定する温度設定部と、温
度設定部の設定温度と温度検出部の検出温度を比較して
検出温度が設定温度よりも低いときにヒータオン信号を
出力する比較部と、ヒータがオンと同時に起動して一定
時間後にタイムアップする第１のタイマと、ヒータがオ
フと同時に起動して一定時間後にタイムアップする第２
のタイマと、比較部の出力であるヒータオン信号を検出
したときはヒータをオンし、また第１のタイマがタイム
アップしたときは比較部のヒータオン信号にかかわらず
ヒータをオフし、ヒータのオフ時には、前記第２タイマ
がタイムアップするまでは前記比較部のヒータオン信号
にかかわらずヒータをオフする制御部と、第１のタイマ
によって制御部がヒータ駆動部を介しヒータをオフした
ときに温度検出部の温度検出信号を強制的に変更する電
圧変更部と、電圧変更部の出力信号によって温度検出部
の温度検出信号の変化非検出時は比較部の故障と判定し
故障信号を出力する判定部とを備えた構成を有する。In order to achieve the above object, a temperature control apparatus according to the present invention comprises a heater, a heater driving section for driving the heater, a temperature detecting section thermally coupled to the heater, and a heater. A temperature setting unit that sets a desired temperature, a comparison unit that compares a set temperature of the temperature setting unit with a detected temperature of the temperature detection unit, and outputs a heater-on signal when the detected temperature is lower than the set temperature. A first timer that starts at the same time as turning on and times out after a certain time, and a second timer that starts at the same time as turning off the heater and times out after a certain time.
The timer is turned on when a heater-on signal, which is an output of the comparison unit, is detected, and when the first timer times out, the heater is turned off regardless of the heater-on signal of the comparison unit. A controller for turning off the heater irrespective of the heater-on signal of the comparing unit until the second timer times out, and a temperature detecting unit when the control unit turns off the heater via the heater driving unit by the first timer. A voltage change unit for forcibly changing the temperature detection signal of the voltage change unit, and a determination unit that determines that the comparison unit has failed when the temperature detection signal of the temperature detection unit does not detect a change based on the output signal of the voltage change unit and outputs a failure signal. It has the structure provided with.
【０００９】[0009]
【作用】本発明は上記構成によって、制御部はＡ／Ｄ変
換器の故障時にはＡ／Ｄ変換値の変化を検出せず、比較
部の故障信号を出力し、比較部のヒータオン信号にかか
わらずヒータをオフするかまたは電源を遮断する保安手
段を動作させるか少なくともどちらか一方の制御を行な
うように作用する。DETAILED DESCRIPTION OF THE INVENTION The present invention by the above configuration, the control unit at the time of failure of the A / D converter does not detect a change in the A / D conversion value, comparing
It outputs a failure signal of the unit and operates to turn off the heater or operate a security unit that shuts off the power supply irrespective of the heater-on signal of the comparison unit, and at least one of them is controlled.
【００１０】[0010]
【実施例】以下、本発明の一実施例を図面を参照しなが
ら説明する。図１は本発明の一実施例の温度制御装置を
用いた電気カーペットの制御ブロック図である。図３、
図４と同一符号を付したものは同一物であるので説明を
省略する。７はヒータ１がオンしたときと同時に起動
し、一定時間経過後タイムアップする第１タイマであ
る。８はヒータ１がオフしたと同時に起動し、一定時間
経過後タイムアップする第２タイマである。制御部６
は、比較部４が、温度検出部２の温度検出信号を入力と
するＡ／Ｄ変換器のＡ／Ｄ変換値と温度設定部３の温度
設定信号を入力とするＡ／Ｄ変換器のＡ／Ｄ変換値を比
較し、温度検出部２の検出温度が温度設定部３の設定温
度よりも低いと判定したとき、ヒータ１をオンする。ま
た、温度検出部２の検出温度が温度設定部３の設定温度
よりも高い（検出温度≧設定温度）と判定したとき、ヒ
ータ１をオフする。ヒータ１をいったんオフすると、設
定温度をヒステリシス分だけ下げ検出温度が設定温度に
到達するまでヒータ１をオフし続ける。さらに、制御部
６は第１タイマ７がタイムアップすると検出温度と設定
温度の関係によらずにヒータ１をオフし、第２タイマ８
がタイムアップするまではヒータ１のオフを継続する。
もし、比較部４のＡ／Ｄ変換器のＡ／Ｄ変換値を格納す
る格納レジスタ４−１−１，４−２−１やＡ／Ｄ変換器
が故障して、検出温度が設定温度よりも低い所で固定し
たときは、第１タイマ７および第２タイマ８にてヒータ
１のオン／オフ制御は行なわれるが実際の温度は上昇し
続ける。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a control block diagram of an electric carpet using a temperature control device according to one embodiment of the present invention. FIG.
Components denoted by the same reference numerals as those in FIG. Reference numeral 7 denotes a first timer which is activated at the same time when the heater 1 is turned on, and which times up after a lapse of a predetermined time. Reference numeral 8 denotes a second timer that is activated at the same time as the heater 1 is turned off, and that times up after a lapse of a predetermined time. Control unit 6
The comparison unit 4 is configured such that the A / D conversion value of the A / D converter to which the temperature detection signal of the temperature detection unit 2 is input and the A / D converter of which the temperature setting signal of the temperature setting unit 3 is input. The D / D conversion values are compared, and when it is determined that the temperature detected by the temperature detection unit 2 is lower than the temperature set by the temperature setting unit 3, the heater 1 is turned on. When it is determined that the temperature detected by the temperature detecting unit 2 is higher than the set temperature of the temperature setting unit 3 (detected temperature ≧ set temperature), the heater 1 is turned off. Once the heater 1 is turned off, the set temperature is lowered by the amount of hysteresis, and the heater 1 is kept turned off until the detected temperature reaches the set temperature. Further, when the first timer 7 times out, the control unit 6 turns off the heater 1 irrespective of the relationship between the detected temperature and the set temperature.
Until the time is up, the heater 1 is kept off.
If the storage registers 4-1-1 and 4-2-1 storing the A / D conversion value of the A / D converter of the comparison unit 4 and the A / D converter fail, the detected temperature becomes lower than the set temperature. When the temperature is fixed at a low level, the first timer 7 and the second timer 8 perform on / off control of the heater 1, but the actual temperature continues to rise.
【００１１】９は電圧変更部で、比較部４にて比較され
た結果または第１タイマ７でヒータ１がオフしたとき
に、ヒータ１のオフが継続される期間（第２タイマがタ
イムアップするまで）の一定時間、温度検出部２の温度
検出信号を強制的に変更する。この温度検出信号の電圧
変更方法を図２に基づいて説明する。前述のように、本
実施例ではＡ／Ｄ変換器を用いて温度検出部２の温度検
出信号を電圧に変換している。一般にＡ／Ｄ変換値は８
ビット（１０進数で０〜２５５、１６進数で００ｈ〜Ｆ
Ｆｈ、以下＊＊ｈは１６進数を表す）で表現される。現
在の温度検出部２の温度検出信号のＡ／Ｄ変換値が８０
ｈ（００ｈ〜ＦＦｈの中間値）よりも小さいとき電圧変
更部９はＡ／Ｄ変換値のＦＦｈと同等の電圧を発生す
る。このとき、温度検出部２の温度検出信号はインピー
ダンスの差異はあるがほぼＦＦｈに変更される。また、
現在の温度検出部２の温度検出信号のＡ／Ｄ変換値が８
０ｈ（００ｈ〜ＦＦｈの中間値）よりも大きいとき電圧
変更部９はＡ／Ｄ変換値の００ｈと同等の電圧を発生す
る。このとき、温度検出部２の温度検出信号はインピー
ダンスの差異はあるがほぼ００ｈに変更される。Reference numeral 9 denotes a voltage changing unit which is a period in which the heater 1 is kept off when the result of the comparison by the comparing unit 4 or when the heater 1 is turned off by the first timer 7 (the second timer times out). ), The temperature detection signal of the temperature detection section 2 is forcibly changed. A method of changing the voltage of the temperature detection signal will be described with reference to FIG. As described above, in this embodiment, the temperature detection signal of the temperature detection unit 2 is converted into a voltage using an A / D converter. Generally, the A / D conversion value is 8
Bit (0 to 255 in decimal, 00h to F in hexadecimal)
Fh, hereinafter ** h represents a hexadecimal number). The A / D conversion value of the current temperature detection signal of the temperature detection unit 2 is 80
When the value is smaller than h (an intermediate value between 00h and FFh), the voltage changing unit 9 generates a voltage equivalent to FFh of the A / D converted value. At this time, the temperature detection signal of the temperature detection unit 2 is changed to substantially FFh although there is a difference in impedance. Also,
The A / D conversion value of the current temperature detection signal of the temperature detection unit 2 is 8
When the voltage is greater than 0h (an intermediate value between 00h and FFh), the voltage changing unit 9 generates a voltage equivalent to the A / D converted value of 00h. At this time, the temperature detection signal of the temperature detection unit 2 is changed to approximately 00h although there is a difference in impedance.
【００１２】１０は判定部で、電圧変更部９により強制
的に変更している時、比較部４のＡ／Ｄ変換器４−１で
変換された温度検出信号のＡ／Ｄ値（格納レジスタ４−
１−１に格納された値）がある一定の領域以内ならば温
度検出部２の温度検出信号のＡ／Ｄ変換値が固定して故
障していると判定し、比較部４の故障信号を発生する。
本実施例の温度制御装置では、現在の温度検出部２の温
度検出信号が８０ｈよりも小さいときは電圧変更部９に
て変更された温度検出信号のＡ／Ｄ変換器４−１でのＡ
／Ｄ変換値がＡ０ｈ〜ＦＦｈの領域、または現在の温度
検出部２の温度検出信号が８０ｈよりも大きいときは電
圧変更部９にて変更された温度検出信号のＡ／Ｄ変換器
４−１でのＡ／Ｄ変換値が００ｈ〜５Ｆｈの領域ならば
Ａ／Ｄ変換器４−１でのＡ／Ｄ変換は正常に動作してい
ると判定する。この領域以外の領域、すなわち６０ｈ〜
９Ｆｈの領域にＡ／Ｄ変換器４−１でのＡ／Ｄ変換値が
あった場合はＡ／Ｄ変換器４−１は固定故障していると
判定し、比較部４の故障信号を発生する。Reference numeral 10 denotes a judgment unit, which is forcibly set by the voltage changing unit 9.
When the value is changed, the A / D converter 4-1 of the comparison unit 4
A / D value of converted temperature detection signal (storage register 4-
If within a certain region 1-1 has a value) stored in the determining that the A / D conversion value of the temperature detection signal of the temperature detector 2 has failed to fix, a fault signal of the comparison unit 4 appear.
In the temperature control device of the present embodiment, when the current temperature detection signal of the temperature detection unit 2 is smaller than 80h, the A / D converter 4-1 converts the temperature detection signal changed by the voltage change unit 9 into A.
When the / D conversion value is in the range of A0h to FFh, or when the current temperature detection signal of the temperature detection unit 2 is larger than 80h, the A / D converter of the temperature detection signal changed by the voltage change unit 9
If the A / D conversion value in 4-1 is in the range of 00h to 5Fh
It is determined that the A / D conversion in the A / D converter 4-1 is operating normally. An area other than this area, that is, 60h
If there is A / D converted value at the A / D converter 4-1 to the area of 9Fh determined that A / D converter 4-1 are permanent fault, generating a fault signal of the comparison unit 4 I do.
【００１３】制御部６は、判定部から比較部４の故障信
号の発生が無い場合は比較部４の出力信号（ヒータオン
信号）および第１タイマ７、第２タイマ８にて制御し、
判定部１０からの故障信号検出時は比較部４のヒータオ
ン信号にかかわらずヒータをオフする。[0013] The control unit 6 transmits a failure signal from the determination unit to the comparison unit 4.
If no signal is generated, control is performed by the output signal (heater ON signal) of the comparison unit 4 and the first timer 7 and the second timer 8,
When a failure signal is detected from the determination unit 10, the heater is turned off regardless of the heater-on signal of the comparison unit 4.
【００１４】このように本実施例によれば、電圧変更部
を用いてヒータのオフ期間に温度検出部の検出電圧を検
出値に対応して強制的に変更し、判定部によって、その
時のＡ／Ｄ変換器によるＡ／Ｄ変換値により、Ａ／Ｄ変
換器の故障の有無を判定して、故障と判断されれば比較
部の故障信号を発し、比較部の出力にかかわらずヒータ
をオフして異常温度上昇事故を防止する。According to the present embodiment, forcibly changed corresponding to the detection voltage of the temperature detection unit to the detection value during the off period of the heater using the voltage changing unit, the determination unit, the
A / D conversion by the A / D conversion value by the A / D converter at the time
To determine if there is a failure in the switch and compare if it is determined to be faulty.
A failure signal of the section is issued and the heater is turned off regardless of the output of the comparison section to prevent an abnormal temperature rise accident.
【００１５】なお、比較部４や第１タイマ７、第２タイ
マ８、電圧変更部９が１チップで構成されているＡ／Ｄ
変換器内蔵のマイクロコンピュータの場合は全く同様で
あり、装置構成に特に有効である。An A / D converter in which the comparing unit 4, the first timer 7, the second timer 8, and the voltage changing unit 9 are constituted by one chip.
The case of a microcomputer with a built-in converter is exactly the same, and is particularly effective for the device configuration.
【００１６】[0016]
【発明の効果】以上の実施例から明らかなように、本発
明によれば、Ａ／Ｄ変換器やＡ／Ｄ変換値を格納するレ
ジスタ等の故障によってＡ／Ｄ変換値が一定の出力値に
固定された場合、これを検出でき、火災や火傷などの不
安全動作を引き起こすことがない温度制御装置を提供で
きる。As is apparent from the above embodiment, according to the present invention, the A / D conversion value is kept constant due to the failure of the A / D converter and the register for storing the A / D conversion value. When fixed to the temperature control device, it is possible to provide a temperature control device that can detect this and does not cause an unsafe operation such as a fire or a burn.
【図１】本発明の一実施例における温度制御装置を用い
た電気カーペットの制御ブロック図FIG. 1 is a control block diagram of an electric carpet using a temperature control device according to an embodiment of the present invention.
【図２】同実施例の温度制御装置における電圧変更を説
明する模式図FIG. 2 is a schematic diagram illustrating a voltage change in the temperature control device of the embodiment.
【図３】従来の温度制御装置における制御ブロック図FIG. 3 is a control block diagram in a conventional temperature control device.
【図４】従来の温度制御装置における比較部の今一つの
例のブロック図FIG. 4 is a block diagram of another example of the comparison unit in the conventional temperature control device.
【図５】従来の温度制御装置における時間−温度特性図FIG. 5 is a time-temperature characteristic diagram in a conventional temperature control device.
【図６】従来の温度制御装置における第１および第２の
タイマと設定温度の時間−温度特性図FIG. 6 is a time-temperature characteristic diagram of first and second timers and a set temperature in a conventional temperature control device.
【図７】従来の温度制御装置における比較部が設定温度
以下で故障したときの第１および第２のタイマによる時
間−温度特性図FIG. 7 is a time-temperature characteristic diagram of the first and second timers when the comparison unit in the conventional temperature control device fails below the set temperature.
１ ヒータ ２ 温度検出部 ３ 温度設定部 ４ 比較部 ５ ヒータ駆動部 ６ 制御部 ７ 第１のタイマ ８ 第２のタイマ ９ 電圧変更部 １０ 判定部 Reference Signs List 1 heater 2 temperature detection unit 3 temperature setting unit 4 comparison unit 5 heater driving unit 6 control unit 7 first timer 8 second timer 9 voltage change unit 10 determination unit
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−189709（ＪＰ，Ａ) 特開 平２−43812（ＪＰ，Ａ) 実開 昭62−128337（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G05D 23/19 - 23/24 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-189709 (JP, A) JP-A-2-43812 (JP, A) JP-A-62-128337 (JP, U) (58) Field (Int.Cl. 7 , DB name) G05D 23/19-23/24
Claims (2)
駆動部と、前記ヒータと熱的に結合した温度検出部と、
前記ヒータを所望の温度に設定する温度設定部と、前記
温度設定部の設定温度と前記温度検出部の検出温度を比
較して検出温度が設定温度よりも低いときにヒータオン
信号を出力する比較部と、前記ヒータがオンと同時に起
動して一定時間後にタイムアップする第１のタイマと、
前記ヒータがオフと同時に起動して一定時間後にタイム
アップする第２のタイマと、前記比較部の出力であるヒ
ータオン信号を検出したときは前記ヒータをオンし、前
記第１のタイマがタイムアップしたときは前記比較部の
ヒータオン信号にかかわらず前記ヒータをオフし、前記
ヒータのオフ時には、前記第２のタイマがタイムアップ
するまでは前記比較部のヒータオン信号にかかわらず前
記ヒータをオフする制御部と、前記第１のタイマによっ
て前記制御部が前記ヒータ駆動部を介し前記ヒータをオ
フしたときに前記温度検出部の温度検出信号を強制的に
変更する電圧変更部と、前記電圧変更部の出力信号によ
る前記温度検出部の温度検出信号の変化非検出時は前記
比較部の故障と判定し故障信号を出力する判定部とを備
え、前記電圧変更部の出力信号による前記温度検出部の
温度検出信号の変化検出時は前記比較部の出力信号にて
前記ヒータを制御し、前記判定部からの故障信号検出時
は前記比較部のヒータオン信号にかかわらず前記ヒータ
をオフするようにした温度制御装置。1. A heater, a heater driving unit for driving the heater, a temperature detection unit thermally coupled to the heater,
A temperature setting unit that sets the heater to a desired temperature; and a comparing unit that compares a set temperature of the temperature setting unit with a detected temperature of the temperature detecting unit and outputs a heater-on signal when the detected temperature is lower than the set temperature. A first timer that is activated at the same time that the heater is turned on and that times out after a fixed time;
A second timer that starts at the same time as the heater is turned off and times up after a certain time, and a heater is turned on when a heater on signal output from the comparison unit is detected, and the first timer times out. When the control unit turns off the heater regardless of the heater on signal of the comparison unit, and when the heater is off, the control unit turns off the heater regardless of the heater on signal of the comparison unit until the second timer times out. A voltage changing unit for forcibly changing a temperature detection signal of the temperature detecting unit when the control unit turns off the heater via the heater driving unit by the first timer; and an output of the voltage changing unit. When the change of the temperature detection signal of the temperature detection unit by the signal is not detected, the
A determination unit that determines that the comparison unit has failed and outputs a failure signal.When a change in the temperature detection signal of the temperature detection unit is detected by the output signal of the voltage change unit, the heater is activated by the output signal of the comparison unit. A temperature control device for controlling the heater to turn off the heater when a failure signal is detected from the determination unit, regardless of a heater-on signal of the comparison unit.
出信号のＡ／Ｄ変換値が８０ｈ（００ｈ〜ＦＦｈの中間
値）よりも小さいときはＡ／Ｄ変換値のＦＦｈと同等の
電圧を、大きいときはＡ／Ｄ変換値の００ｈと同等の電
圧を発生し前記温度検出部の温度検出信号を強制的に変
更するようにした請求項１記載の温度制御装置。2. The voltage change section, when the current A / D conversion value of the temperature detection signal of the temperature detection section is smaller than 80h (an intermediate value between 00h and FFh), a voltage equivalent to the FFh of the A / D conversion value. 2. The temperature control device according to claim 1, wherein, when is larger, a voltage equivalent to the A / D conversion value of 00h is generated to forcibly change the temperature detection signal of the temperature detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03747892A JP3303323B2 (en) | 1992-02-25 | 1992-02-25 | Temperature control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03747892A JP3303323B2 (en) | 1992-02-25 | 1992-02-25 | Temperature control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05233078A JPH05233078A (en) | 1993-09-10 |
| JP3303323B2 true JP3303323B2 (en) | 2002-07-22 |
Family
ID=12498633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03747892A Expired - Fee Related JP3303323B2 (en) | 1992-02-25 | 1992-02-25 | Temperature control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3303323B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5251667B2 (en) * | 2009-03-27 | 2013-07-31 | パナソニック株式会社 | Electronic components |
| JP5489861B2 (en) * | 2010-05-20 | 2014-05-14 | ルネサスエレクトロニクス株式会社 | Semiconductor device and engine control board |
-
1992
- 1992-02-25 JP JP03747892A patent/JP3303323B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05233078A (en) | 1993-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3303323B2 (en) | Temperature control device | |
| JP3298128B2 (en) | Temperature control device | |
| JP2874357B2 (en) | Electric water heater control device | |
| JP2865319B2 (en) | Electric water heater | |
| JP3051284B2 (en) | Power failure control device | |
| JPH044515B2 (en) | ||
| KR960006198Y1 (en) | Compressor protecting circuit of refrigerator | |
| JPH1028330A (en) | System interconnection for distributed power source | |
| JPH086920B2 (en) | Combustion detector | |
| JPS58105272A (en) | Temperature controller of fixation device in copying machine | |
| JPH0212413A (en) | Abnormality detection for temperature detecting means | |
| JPH05188714A (en) | Image forming device | |
| KR0148902B1 (en) | Auto controlling apparatus and method for oven range | |
| JPH02197757A (en) | Electric power supply control device for electric water heater | |
| JP2939610B2 (en) | Heating toilet seat controller | |
| JPH0125896Y2 (en) | ||
| JPH05215400A (en) | Controller for hot water storage type electric warm water oven | |
| JPS63212977A (en) | Temperature controller for fixing device | |
| JPH0553659A (en) | Heating device | |
| JP3862307B2 (en) | Power supply | |
| KR0163084B1 (en) | Battery back-up apparatus and its control method | |
| JPH0219312B2 (en) | ||
| JP3109173B2 (en) | Inverter control circuit | |
| JPH09128065A (en) | Power supply device | |
| JP2532473B2 (en) | Temperature control device for heating equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090510 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100510 Year of fee payment: 8 |
|
| LAPS | Cancellation because of no payment of annual fees |