JP2006048992A

JP2006048992A - Overheat prevention circuit

Info

Publication number: JP2006048992A
Application number: JP2004225451A
Authority: JP
Inventors: Kozo Shibata; 耕蔵芝田
Original assignee: AMAMI KK; Amami Co Ltd
Current assignee: AMAMI KK; Amami Co Ltd
Priority date: 2004-08-02
Filing date: 2004-08-02
Publication date: 2006-02-16

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overheat prevention circuit capable of realizing an electric heater having high reliability and safety, and preventing its heat-generating unit from malfunctioning and heating by itself. <P>SOLUTION: When a temperature at the top portion of a reflector 15 which is easily overheated by heat radiated from a heat-generating unit 18 of a heat-generating portion 3 consisting of an electric heater 1 rises up to more than a predetermined temperature, a temperature sensor 25 is set to an ON-state where a master reset terminal 23a of a PIC circuit 23 is reset and it is made impossible to drive by a regular switching operation. On the other hand, when a temperature at the top portion of a reflector 15 falls below a predetermined value, the temperature sensor 25 automatically returns to an OFF-state where the reset-state of the master reset terminal 23a of the PIC circuit 23 is released and it is made possible to return to a standby state where driving is made possible by a regular switching operation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、例えば電気ヒーターや電気ストーブ、電気火鉢、電気アンカ等の発熱機能を有する発熱装置の過熱を防止するために用いられる過熱防止回路に関する。 The present invention relates to an overheat prevention circuit used for preventing overheating of a heat generating device having a heat generating function such as an electric heater, an electric stove, an electric brazier, and an electric anchor.

従来、上述の過熱防止回路としては、例えばハロゲンヒーターの電気回路を構成するダイオードを支持するヒートシンクに、ダイオード不良時に発生する急激な熱上昇を防止する温度過昇防止装置を装着した特許文献１の温度過昇防止装置付ハロゲンヒーターがある。 Conventionally, as the above-described overheat prevention circuit, for example, Patent Document 1 in which a heat sink that supports a diode constituting an electric circuit of a halogen heater is equipped with a temperature overheat prevention device that prevents a sudden heat rise that occurs when a diode is defective is used. There is a halogen heater with an overheat prevention device.

しかし、上述の温度過昇防止装置付ハロゲンヒーターには、使用時に何らかの状況により転倒した場合、電源全体をＯＦＦするための安全スイッチ（正常位置ではＯＮ状態）が取り付けられている。また、ハロゲンヒーター近くに装着したサーモスタット又は温度フューズにより、異常温度又は温度過昇を検出した場合、ハロゲンヒーターへの電源をＯＦＦさせる。 However, the above-described halogen heater with an overheat prevention device is provided with a safety switch (ON state at a normal position) for turning off the entire power supply when it falls down due to some situation during use. Further, when an abnormal temperature or excessive temperature is detected by a thermostat or a temperature fuse installed near the halogen heater, the power supply to the halogen heater is turned off.

例えば正常温度になると勝手にＯＮ状態に復旧するような自動復帰型の温度フューズを使用した場合、電源スイッチをＯＮ操作していないのにハロゲンヒーターが勝手に発熱するため、ハロゲンヒーター近くの物が過熱しすぎにより溶解するか、電子部品が熱により故障することがある。また、火災や火傷等が起きる原因となるため、安全性の点で高い信頼が得られない。 For example, when an automatic reset type temperature fuse that automatically returns to the ON state at normal temperature is used, the halogen heater generates heat even when the power switch is not turned on. It may melt due to overheating or the electronic components may be damaged by heat. Moreover, since it causes a fire, a burn, etc., high reliability cannot be obtained in terms of safety.

また、部品を取り替えないとＯＮ状態に回復できないものを使用した場合、部品の取り替え作業に手間及び時間が掛かるだけでなく、部品や作業等に費用が掛かるため、経費及び維持費が高くなる。 In addition, when a component that cannot be restored to the ON state unless the component is replaced is used, not only the replacement of the component takes time and labor, but also costs are increased for the component and the work.

使用時において、特別に温度上昇を来す重要な部品（例えば強・弱に切替え用ダイオード）の故障による過熱事故防止用の温度フューズもあるが、過熱時において、温度フューズが短絡して、通電を遮断するものであるため、上述と同様に、ＯＮ状態に回復させる場合、取り替えなければならない。 There are temperature fuses to prevent overheating accidents due to the failure of important parts (for example, strong and weak switching diodes) that cause a special rise in temperature during use. However, during overheating, the temperature fuse is short-circuited and energized. As described above, when the state is restored to the ON state, it must be replaced.

実用新案登録第３０８８７４４号公報Utility Model Registration No. 3088744

この発明は上記問題に鑑み、発熱部から放射される熱により過熱しやすい部分の温度を検知する温度センサによる検知に基づいて、各部への通電を制御するＰＩＣ回路のマスターリセット端子をリセット又は該リセットを解除することより、発熱部から放射される熱により過熱しやすい部分の温度が低下しても、手動により通電可能な状態にＯＮ操作するまで、発熱部が勝手に発熱するようなことがなく、誤動作が防止され、高い信頼性及び安全性を得ることができる過熱防止回路の提供を目的とする。 In view of the above problems, the present invention resets the master reset terminal of the PIC circuit that controls energization to each part based on the detection by the temperature sensor that detects the temperature of the part that is easily overheated by the heat radiated from the heat generating part. By canceling the reset, even if the temperature of the part that is likely to overheat due to the heat radiated from the heat generating part falls, the heat generating part may generate heat spontaneously until it is turned on manually. It is another object of the present invention to provide an overheat prevention circuit that can prevent malfunction and obtain high reliability and safety.

請求項１に記載した発明の過熱防止回路は、発熱部から放射される熱で所望する部分又は範囲を適度に加熱する発熱装置に備えられる過熱防止回路であって、上記発熱部から放射される熱により過熱しやすい部分の温度を検知する温度センサを、ＰＮＰ型トランジスターのエミッタとベースとに接続し、上記発熱装置の各部への通電を制御するＰＩＣ回路のマスターリセット端子を、上記ＰＮＰ型トランジスターのコレクタに接続し、上記過熱しやすい部分が所定温度以上に上昇し、該部分の温度を検知する温度センサがＯＮ状態に変位したとき、上記ＰＮＰ型トランジスターのエミッタとベースとに略同一の電圧を付加し、その時に出力される信号でＰＩＣ回路のマスターリセット端子を上記各部への通電が遮断される状態にリセットし、上記過熱しやすい部分が所定温度以下に低下し、該部分の温度を検知する温度センサがＯＦＦ状態に復帰したとき、上記ＰＮＰ型トランジスターのエミッタとベースとに異なる電圧を付加し、上記ＰＩＣ回路のマスターリセット端子を上記各部への通電が可能な状態にリセット解除して、手動によるスイッチ操作で通電可能な待機状態に復帰させることを特徴とする。 The overheat prevention circuit of the invention described in claim 1 is an overheat prevention circuit provided in a heat generating device that appropriately heats a desired portion or range with heat radiated from the heat generating portion, and is radiated from the heat generating portion. A temperature sensor that detects the temperature of a portion that is likely to overheat due to heat is connected to the emitter and base of a PNP transistor, and a master reset terminal of a PIC circuit that controls energization to each part of the heat generating device is connected to the PNP transistor When the temperature of the part that is likely to overheat rises above a predetermined temperature and the temperature sensor that detects the temperature of the part is displaced to the ON state, substantially the same voltage is applied to the emitter and base of the PNP transistor. And reset the master reset terminal of the PIC circuit to a state in which the energization to each of the above parts is cut off by the signal output at that time, When the overheated part falls below a predetermined temperature and the temperature sensor for detecting the temperature of the part returns to the OFF state, different voltages are applied to the emitter and base of the PNP transistor, and the PIC circuit The master reset terminal is released from reset to a state where power can be supplied to each of the above parts, and is returned to a standby state where power can be supplied by a manual switch operation.

つまり、発熱部から放射される熱により過熱しやすい部分が所定温度以上に上昇し、その部分の温度を検知する温度センサがＯＮ状態に変位したとき、ＰＮＰ型トランジスターのエミッタとベースとに略同一の電圧を付加して、エミッタからコレクタへの通電を遮断すると共に、温度センサのＯＮ状態時に出力される信号でＰＩＣ回路のマスターリセット端子を各部への通電が遮断される状態にリセットする。上述の過熱しやすい部分が所定温度以下に低下し、その部分の温度を検知する温度センサがＯＦＦ状態に自動復帰したとき、ＰＮＰ型トランジスターのエミッタとベースとに異なる電圧を付加して、エミッタからコレクタへの通電を可能にすると共に、温度センサのＯＦＦ状態に信号を出力せず、ＰＩＣ回路のマスターリセット端子を各部への通電が可能な状態にリセット解除して、手動による通常のスイッチ操作で通電可能な待機状態に復帰させる。 That is, when a portion that is likely to overheat due to the heat radiated from the heating portion rises above a predetermined temperature and the temperature sensor that detects the temperature of that portion is displaced to the ON state, the emitter and base of the PNP transistor are substantially the same. Is applied to cut off the energization from the emitter to the collector, and the master reset terminal of the PIC circuit is reset to a state where the energization to each part is cut off by a signal output when the temperature sensor is in the ON state. When the above-mentioned part that is likely to overheat falls below a predetermined temperature and the temperature sensor that detects the temperature of that part automatically returns to the OFF state, a different voltage is applied to the emitter and base of the PNP transistor, Enables energization to the collector, does not output a signal to the temperature sensor OFF state, cancels the master reset terminal of the PIC circuit to a state where energization to each part can be performed, and allows normal manual switch operation Return to a standby state where power can be applied.

請求項２に記載した発明の過熱防止回路は、発熱部から放射される熱で所望する部分又は範囲を適度に加熱する発熱装置に備えられる過熱防止回路であって、上記発熱部から放射される熱により過熱しやすい部分の温度を検知する温度センサを、ＮＰＮ型トランジスターのエミッタとベースとに接続し、上記発熱装置の各部への通電を制御するＰＩＣ回路のマスターリセット端子を、上記ＮＰＮ型トランジスターのエミッタに接続し、上記過熱しやすい部分が所定温度以上に上昇し、該部分の温度を検知する温度センサがＯＮ状態に変位したとき、上記ＮＰＮ型トランジスターのエミッタとベースとに略同一の電圧を付加し、その時に出力される信号でＰＩＣ回路のマスターリセット端子を上記各部への通電が遮断される状態にリセットし、上記過熱しやすい部分が所定温度以下に低下し、該部分の温度を検知する温度センサがＯＦＦ状態に復帰したとき、上記ＮＰＮ型トランジスターのエミッタとベースとに異なる電圧を付加し、上記ＰＩＣ回路のマスターリセット端子を上記各部への通電が可能な状態にリセット解除して、手動によるスイッチ操作で通電可能な待機状態に復帰させることを特徴とする。 An overheat prevention circuit according to a second aspect of the present invention is an overheat prevention circuit provided in a heat generating device that appropriately heats a desired portion or range with heat radiated from a heat generating portion, and is radiated from the heat generating portion. A temperature sensor that detects the temperature of a portion that is likely to overheat due to heat is connected to the emitter and base of the NPN transistor, and the master reset terminal of the PIC circuit that controls the energization of each part of the heat generating device is connected to the NPN transistor When the temperature of the part that is likely to overheat rises above a predetermined temperature and the temperature sensor that detects the temperature of the part is turned ON, the emitter and base of the NPN transistor have substantially the same voltage. And reset the master reset terminal of the PIC circuit to a state in which the energization to each of the above parts is cut off by the signal output at that time, When a portion that tends to overheat falls below a predetermined temperature and the temperature sensor that detects the temperature of the portion returns to the OFF state, different voltages are applied to the emitter and base of the NPN transistor, and the PIC circuit The master reset terminal is released from reset to a state where power can be supplied to each of the above parts, and is returned to a standby state where power can be supplied by a manual switch operation.

つまり、発熱部から放射される熱により過熱しやすい部分が所定温度以上に上昇し、その部分の温度を検知する温度センサがＯＮ状態に変位したとき、ＮＰＮ型トランジスターのエミッタとベースとに略同一の電圧を付加して、コレクタからエミッタへの通電を遮断すると共に、温度センサのＯＮ状態時に出力される信号でＰＩＣ回路のマスターリセット端子を各部への通電が遮断される状態にリセットする。上述の過熱しやすい部分が所定温度以下に低下し、その部分の温度を検知する温度センサがＯＦＦ状態に自動復帰したとき、ＮＰＮ型トランジスターのエミッタとベースとに異なる電圧を付加して、コレクタからエミッタへの通電を可能にすると共に、温度センサのＯＦＦ状態に信号を出力せず、ＰＩＣ回路のマスターリセット端子を各部への通電が可能な状態にリセット解除して、手動による通常のスイッチ操作で通電可能な待機状態に復帰させる。 That is, when the portion that is likely to overheat due to the heat radiated from the heat generating portion rises above a predetermined temperature and the temperature sensor that detects the temperature of that portion is displaced to the ON state, the emitter and base of the NPN transistor are substantially the same. Is applied to cut off the energization from the collector to the emitter, and the master reset terminal of the PIC circuit is reset to a state where the energization to each part is interrupted by a signal output when the temperature sensor is in the ON state. When the above-explained portion that overheats falls below a predetermined temperature and the temperature sensor that detects the temperature of that portion automatically returns to the OFF state, a different voltage is applied to the emitter and base of the NPN transistor, Enables energization to the emitter, does not output a signal to the temperature sensor OFF state, cancels resetting the master reset terminal of the PIC circuit to a state where energization to each part is possible, and allows normal manual switch operation Return to a standby state where power can be applied.

上述の温度センサは、例えば発熱部から放射される熱により過熱しやすい部分が所定温度以上に上昇するとＯＮ状態となり、その部分が所定温度以下に低下するとＯＦＦ状態に自動復帰又は自動復旧するようなサーモスタット、或いは、非接触式センサや接触式センサ等で構成することができる。また、過熱しやすい部分とは、例えば電気ヒーターや電気火鉢、電気アンカ等の発熱装置を構成する発熱ユニットから放射される熱により過熱しやすい反射板の頂上部、反射板の中央部等に相当する。 For example, the above-described temperature sensor is turned on when a portion that is likely to be overheated by heat radiated from the heat generating portion rises above a predetermined temperature, and automatically returns to or recovers from the OFF state when the portion falls below a predetermined temperature. It can be composed of a thermostat, a non-contact sensor, a contact sensor, or the like. Moreover, the part which is easy to overheat is equivalent to the top part of the reflecting plate which is easily overheated by the heat radiated from the heat generating unit constituting the heating device such as an electric heater, electric brazier, electric anchor, etc., the central part of the reflecting plate, etc. To do.

請求項３に記載した発明の過熱防止回路は、上記請求項１又は２記載の構成と併せて、上記温度センサを、上記発熱部から放射される熱により過熱しやすい部分に設けたことを特徴とする。つまり、過熱しやすい部分の温度変化に対応して、ＰＩＣ回路回路を作動又は停止させるので、他の部分が所定温度以上の高温に過熱されるのを防止し、機能を維持することができる。 According to a third aspect of the present invention, there is provided the overheat prevention circuit according to the first or second aspect, wherein the temperature sensor is provided in a portion that is easily overheated by heat radiated from the heat generating portion. And That is, since the PIC circuit circuit is activated or stopped in response to a temperature change in a portion that is likely to be overheated, other portions are prevented from being overheated to a high temperature that is equal to or higher than a predetermined temperature, and the function can be maintained.

請求項４に記載した発明の過熱防止回路は、上記請求項１，２又は３記載の構成と併せて、上記温度センサを、上記発熱部から放射される熱で過熱しやすい部分が所定温度以下に低下するとＯＦＦ状態に復帰する自動復帰型のサーモスタットで構成したことを特徴とする。つまり、上述のサーモスタットは、過熱しやすい部分の温度が所定温度以下に低下するとＯＦＦ状態に自動復帰するので、ＯＮ状態に回復させるために、部品を取り替えるような手間及び作業が省け、作業性の向上及び経費の削減が図れる。 According to a fourth aspect of the present invention, there is provided the overheat prevention circuit according to the first, second, or third aspect, wherein the temperature sensor has a portion where the temperature sensor is easily overheated by heat radiated from the heat generating portion. It is characterized by comprising an auto-reset thermostat that returns to the OFF state when lowered to. In other words, the above-described thermostat automatically returns to the OFF state when the temperature of the part that is likely to overheat falls below a predetermined temperature, so that it takes time and labor to replace parts in order to recover to the ON state. Improve and reduce costs.

この発明によれば、発熱部から放射される熱で過熱しやすい部分が所定温度以上に上昇すると、温度センサがＯＮ状態となり、ＰＩＣ回路のマスターリセット端子を各部への通電が遮断される状態にリセットする。一方、過熱しやすい部分が所定温度以下に低下すると、温度センサがＯＦＦ状態に自動復帰し、ＰＩＣ回路のマスターリセット端子を各部への通電が可能な待機状態にリセット解除するが、電源スイッチを、手動により通電可能な状態にＯＮ操作しなければ発熱部に通電されず、従来例のように温度センサが自動復帰すると同時に、発熱部が勝手に発熱するようなことがなく、誤動作が防止され、高い信頼性及び安全性が得られる。また、通常の通電可能な状態に復帰させるために特別な部品を交換する必要がなく、通常のスイッチ操作で再使用することができる。 According to the present invention, when the portion that is likely to be overheated by the heat radiated from the heat generating portion rises to a predetermined temperature or more, the temperature sensor is turned on, and the master reset terminal of the PIC circuit is turned off. Reset. On the other hand, when the part that is likely to overheat falls below a predetermined temperature, the temperature sensor automatically returns to the OFF state, and the master reset terminal of the PIC circuit is reset to a standby state where each part can be energized. If the power is not turned on manually, the heat generating part is not energized, and the temperature sensor automatically recovers as in the conventional example. At the same time, the heat generating part does not generate heat on its own, and malfunction is prevented. High reliability and safety can be obtained. Further, it is not necessary to replace special parts in order to return to a normal energized state, and can be reused by a normal switch operation.

また、温度センサの接点は信号を出力するものであり、大電流を通電又は遮断するものではないため、寿命が長く、コストの低減を図ることができる。また、温度センサを、ＰＮＰ型トランジスター又はＮＰＮ型トランジスターのエミッタとベースとの間に接続するので、過熱を防止するための回路の実装やプログラムの変更が不要であり、過熱防止機能を簡単に取り付けることができる。 Further, the contact of the temperature sensor outputs a signal and does not energize or cut off a large current. Therefore, the lifetime is long and the cost can be reduced. In addition, since a temperature sensor is connected between the emitter and base of a PNP transistor or NPN transistor, there is no need to implement a circuit or change the program to prevent overheating, and an overheat prevention function can be easily installed. be able to.

この発明は、発熱部から放射される熱により過熱しやすい部分の温度が低下しても、手動により通電可能な状態にＯＮ操作するまで、発熱部が勝手に発熱するようなことがなく、誤動作が防止され、高い信頼性及び安全性を得ることができるという目的を、発熱部から放射される熱により過熱しやすい部分の温度を検知する温度センサによる検知に基づいて、各部への通電を制御するＰＩＣ回路のマスターリセット端子をリセット又は該リセットを解除することで達成した。 Even if the temperature of the portion that is easily overheated by the heat radiated from the heat generating portion is lowered, the heat generating portion does not generate heat arbitrarily until it is manually turned ON, and malfunctions. Control of energization of each part based on detection by the temperature sensor that detects the temperature of the part that is easily overheated by the heat radiated from the heating part. This is accomplished by resetting or canceling the master reset terminal of the PIC circuit.

この発明の一実施の形態を以下図面に基づいて詳述する。
図面は、発熱装置の一例である電気ヒーターに過熱防止回路を備えた実施形態を示し、図１に於いて、この電気ヒーター１は、例えば床や地面等の所望する場所に対して起立状態に設置される側面から見て略台形状の支持台２と、その支持台２の上端部に対して上下及び左右に回動自在に取り付けられ、所望する方向に向けて熱（遠赤外線）を放射する発熱部３とで構成される。 An embodiment of the present invention will be described below in detail with reference to the drawings.
The drawings show an embodiment in which an overheat prevention circuit is provided in an electric heater which is an example of a heating device. In FIG. 1, the electric heater 1 is installed in a standing state with respect to a desired place such as a floor or the ground. The support base 2 is substantially trapezoidal as viewed from the side surface, and is attached to the upper end of the support base 2 so as to be rotatable up and down and left and right, and radiates heat (far infrared rays) in a desired direction. The heat generating part 3 is comprised.

上述の支持台２は、側面から見て略円筒状に形成した支持部４を、平面から見て略円盤状に形成した台座部５の略上面中央部に立設し、支持部４の上端側中心部に対して所望する高さに上下調節自在に挿入された支柱６を、モータ(図示省略)により上下及び左右に回動される首振り機構７を介して、後述する発熱部３の後側下部に連結している。また、首振り機構７を、例えば利用者の手で所望する角度及び方向に回動自在に設けることもできる。 The above-mentioned support base 2 has a support portion 4 formed in a substantially cylindrical shape when viewed from the side, and is erected at a substantially upper central portion of a pedestal portion 5 formed in a substantially disk shape when viewed from the plane. A support column 6 that is inserted in a desired height with respect to the center of the side is adjustable up and down by a motor (not shown) through a swing mechanism 7 that is rotated up and down and left and right. It is connected to the rear lower part. Further, the swing mechanism 7 can be provided so as to be rotatable in a desired angle and direction by a user's hand, for example.

且つ、支柱６の上下動を固定及びその固定を解除する高さ調節ボタン８を、支柱６側部（例えば後面や側面、前面等）に設け、発熱部３を所望する高さに上下調節するときに操作する。また、発熱部３の高さを、例えばレバーやハンドル等で上下調節することもできる。 In addition, a height adjustment button 8 for fixing the vertical movement of the column 6 and for releasing the fixation is provided on the side of the column 6 (for example, the rear surface, the side surface, the front surface, etc.), and the heating unit 3 is adjusted to a desired height. When to operate. Further, the height of the heat generating portion 3 can be adjusted up and down with, for example, a lever or a handle.

且つ、後述する発熱ユニット１８に対して電源から供給される電流を通電又は遮断し、首振り機構７を駆動及び停止するための電源スイッチ９と、発熱ユニット１８の発熱時間を設定するためのタイマースイッチ１０と、発熱ユニット１８の発熱温度を強・中・弱に切替えるための切替えスイッチ１１とを、台座部５の前側上面（操作面）に配設している。 In addition, a power switch 9 for energizing or interrupting a current supplied from a power source to a heat generating unit 18 to be described later to drive and stop the swing mechanism 7 and a timer for setting a heat generating time of the heat generating unit 18 A switch 10 and a change-over switch 11 for switching the heat generation temperature of the heat generating unit 18 between high, medium, and weak are disposed on the front upper surface (operation surface) of the pedestal portion 5.

且つ、電気ヒーター１が所定角度以上に傾斜又は転倒したときに通電を遮断し、電気ヒーター１を所定角度に起立又は台座部５を安定姿勢に接地したときに通電する転倒防止スイッチ１２を、台座部５の接地面側に設けると共に、電源（例えば一般家庭用又は工業用のコンセント）に接続されるプラグ付きの電源コード１３を、台座部５の後部又は側部に接続している。また、電源コード１３を収容するためのコード収容部（図示省略）を、台座部５の後部又は側部に設けることもできる。 In addition, the pedestal is provided with a tumbling prevention switch 12 that cuts off power when the electric heater 1 is tilted or falls more than a predetermined angle, and that is turned on when the electric heater 1 stands up at a predetermined angle or the pedestal 5 is grounded in a stable posture. A power cord 13 with a plug that is provided on the ground surface side of the portion 5 and connected to a power source (for example, a general household or industrial outlet) is connected to the rear portion or the side portion of the pedestal portion 5. In addition, a cord housing portion (not shown) for housing the power cord 13 can be provided at the rear portion or the side portion of the base portion 5.

なお、実施例のスイッチ９，１０，１１はダイヤル式（回動式）であるが、例えば静電感知式スイッチや感圧式スイッチ、レバー式スイッチ、スライド式スイッチ等で構成するか、各種スイッチを組み合わせて構成することもできる。また、発熱ユニット１８のＯＮ及びＯＦＦ、発熱時間、発熱温度、首振り動作等を、例えば無線式（赤外線式）のリモート・コントローラーで制御することもできる。 Note that the switches 9, 10, and 11 of the embodiment are dial type (turning type). For example, the switches 9, 10, and 11 are constituted by electrostatic sensing switches, pressure sensitive switches, lever type switches, slide type switches, etc. It can also be configured in combination. Further, ON / OFF of the heat generation unit 18, heat generation time, heat generation temperature, swinging operation, and the like can be controlled by, for example, a wireless (infrared type) remote controller.

前述の発熱部３は、正面から見て略円形状で、側面から見て略椀形状（略パラボラアンテナ型）に形成した反射効率のよい金属製（例えばアルミニウムやステンレス等）の反射板１５を、上述の支柱６上端に連結した本体部１４前面に取り付け、その反射板１５の後面側に、反射板１５と略酷似する断面形状に形成した合成樹脂製又は金属製の反射板カバー１６を取り付け、金属製の線条体を略放射状に配設してなる側面から見て略椀形状に形成した発熱部カード１７を、反射板１５の前面側に取り付け、遠赤外線からなる熱を放射する発熱ユニット１８を、反射板１５の前面側中央部に取り付けている。且つ、複数の放熱孔（図示省略）を反射板カバー１６の後面側に形成して、反射板１５と反射板カバー１６との対向面間に形成された空間部と連通している。 The heating unit 3 includes a reflective plate 15 made of a metal (for example, aluminum or stainless steel) having a high reflection efficiency and formed in a substantially circular shape when viewed from the front and a substantially bowl shape (substantially parabolic antenna type) when viewed from the side. , Attached to the front surface of the main body 14 connected to the upper end of the support column 6, and attached to the rear surface side of the reflector plate 15 is a synthetic resin or metal reflector plate cover 16 formed in a cross-sectional shape substantially similar to the reflector plate 15. The heat generating part card 17 formed in a substantially bowl shape when viewed from the side formed by arranging the metal filaments in a substantially radial manner is attached to the front side of the reflecting plate 15 to generate heat generated from far infrared rays. The unit 18 is attached to the central portion on the front side of the reflecting plate 15. In addition, a plurality of heat radiation holes (not shown) are formed on the rear surface side of the reflecting plate cover 16 and communicate with a space formed between the opposing surfaces of the reflecting plate 15 and the reflecting plate cover 16.

前述の発熱ユニット１８は、側面から見て略円錐筒状に形成した金属製（例えばアルミニウムやステンレス等）の支持部材１９を、反射板１５の前面側中央部に固定し、後述する発熱ヒーター２１の前面及び側面が覆われる大きさに形成した発熱体カバー２０を、支持部材１９の前端部に取り付け、正面から見て略環状に形成した発熱ヒーター２１（例えばハロゲンヒーターやシーズヒーター等の発熱体）を、発熱体カバー２０の後面側に取り付けている。 In the heat generating unit 18 described above, a support member 19 made of a metal (for example, aluminum or stainless steel) formed in a substantially conical cylinder shape as viewed from the side is fixed to the central portion on the front side of the reflector 15, and a heat generating heater 21 described later. A heating element cover 20 formed in a size that covers the front and side surfaces of the heating member 21 is attached to the front end of the support member 19, and a heating element 21 (for example, a heating element such as a halogen heater or a sheathed heater) formed in a substantially annular shape when viewed from the front. ) Is attached to the rear surface side of the heating element cover 20.

前述の台座部５に内蔵された制御部２２は、首振り機構７と、電源スイッチ９と、タイマースイッチ１０と、切替えスイッチ１１と、転倒防止スイッチ１２と、発熱ユニット１８と、温度センサ２５との駆動及び停止を制御するＰＩＣ回路２３と、発熱部３の一部（特に反射板１５の頂上部）又は全体が過熱されるのを防止する過熱防止回路２４とを備えている。 The control unit 22 incorporated in the pedestal unit 5 includes a swing mechanism 7, a power switch 9, a timer switch 10, a changeover switch 11, a fall prevention switch 12, a heat generation unit 18, a temperature sensor 25, and the like. The PIC circuit 23 that controls the driving and stopping of the heating unit 3 and the overheating prevention circuit 24 that prevents a part of the heat generating unit 3 (particularly the top of the reflector 15) or the whole from being overheated are provided.

上述の過熱防止回路２４は、図２にも示すように、自動復帰型サーモスタットで構成される温度センサ２５を、発熱ユニット１８から放射される熱により過熱されやすい部分に相当する反射板１５の頂上部に設け、その温度センサ２５の接点２５ａ，２５ａに直結された回線２５ｃ，２５ｃを、ＰＮＰ型トランジスター２７のエミッタ２７ａに直結されたＶｃｃ２６（回路用電源）の回線２６ａと、ＰＮＰ型トランジスター２７のベース２７ｂとに接続している。 As shown in FIG. 2, the above-described overheat prevention circuit 24 has a temperature sensor 25 formed of an automatic return thermostat, the top of the reflector 15 corresponding to a portion that is easily overheated by heat radiated from the heat generating unit 18. Line 25c, 25c directly connected to contacts 25a, 25a of temperature sensor 25, Vcc 26 (circuit power supply) line 26a directly connected to emitter 27a of PNP transistor 27, and PNP transistor 27 It is connected to the base 27b.

また、ＰＮＰ型トランジスター２７のエミッタ２７ａとベース２７ｂとに電圧差を生じさせるような抵抗値（１０Ω）の第１抵抗２８を、ＰＮＰ型トランジスター２７のエミッタ２７ａ及びベース２７ｂの近くに配線された温度センサ２５の回線２５ｃ，２５ｃ間に接続している。 In addition, a first resistor 28 having a resistance value (10Ω) that causes a voltage difference between the emitter 27a and the base 27b of the PNP transistor 27 is wired near the emitter 27a and the base 27b of the PNP transistor 27. The sensor 25 is connected between the lines 25c and 25c.

また、第１抵抗２８と対向してベース２７ｂ側の回線２５ｃに直結された回線２５ｄを、第１抵抗２８よりも大きな抵抗値（５１Ω）の第２抵抗２９を介して、アース３２に接続している。 Further, a line 25d that is directly connected to the line 25c on the base 27b side so as to face the first resistor 28 is connected to the ground 32 via a second resistor 29 having a resistance value (51Ω) larger than that of the first resistor 28. ing.

また、ＰＮＰ型トランジスター２７のコレクタ２７ｃに直結された回線２７ｄを、任意の抵抗値（ＲΩ）の第３抵抗３０を介して、アース３２に接続している。 A line 27d directly connected to the collector 27c of the PNP transistor 27 is connected to the ground 32 through a third resistor 30 having an arbitrary resistance value (RΩ).

また、ＰＩＣ回路２３のマスターリセット端子２３ａを、ＰＮＰ型トランジスター２７のコレクタ２７ｃと第３抵抗３０との間の回線２７ｄに接続している。 The master reset terminal 23 a of the PIC circuit 23 is connected to a line 27 d between the collector 27 c of the PNP transistor 27 and the third resistor 30.

上述の回線２５ｃ，２５ｃは、支持台２を構成する支持部４及び台座部５、支柱６の内部と、発熱部３を構成する反射板１５と反射板カバー１６との間に形成された空間部とに配線しているが、回線２５ｃ，２５ｃが長くなると、外部のノイズが回線２５ｃ，２５ｃに伝わり、ＰＮＰ型トランジスター２７が誤作動する恐れがあるため、ノイズ除去機能を有するコンデンサー３１を、温度センサ２５と第１抵抗２８との間に配線された回線２５ｃ，２５ｃ間に接続している。 The lines 25 c and 25 c described above are spaces formed between the support 4, the pedestal 5, and the support 6 that constitute the support 2, and between the reflector 15 and the reflector cover 16 that constitute the heat generating part 3. However, if the lines 25c and 25c become long, external noise is transmitted to the lines 25c and 25c, and the PNP transistor 27 may malfunction. The temperature sensor 25 and the first resistor 28 are connected between lines 25c and 25c wired between them.

上述の温度センサ２５は、発熱ユニット１８から放射される熱により過熱しやすい反射板１５の頂上部が所定温度以上に上昇したとき、温度センサ２５の接点２５ａ，２５ａがスイッチ２５ｂにより通電可能なＯＮ状態に接続され、その接点２５ａ，２５ａを接続したときに発生する信号をＰＩＣ回路２３に出力する。且つ、反射板１５の頂上部が所定温度以下に低下し、温度センサ２５のスイッチ２５ｂが接点２５ａ，２５ａから離れてＯＦＦ状態に自動復帰したときは、上述の信号はＰＩＣ回路２３に出力されない。また、温度センサ２５を、例えば発熱ヒーターやダイオード等の部品が所定温度以上に過熱されるのを防止するために設けてもよい。 The above-described temperature sensor 25 is ON so that the contacts 25a and 25a of the temperature sensor 25 can be energized by the switch 25b when the top of the reflector 15 that is likely to overheat due to heat radiated from the heat generating unit 18 rises above a predetermined temperature. A signal generated when the contacts 25a and 25a are connected is output to the PIC circuit 23. In addition, when the top of the reflector 15 is lowered to a predetermined temperature or less and the switch 25b of the temperature sensor 25 is separated from the contacts 25a and 25a and automatically returns to the OFF state, the above signal is not output to the PIC circuit 23. Further, the temperature sensor 25 may be provided in order to prevent components such as a heater and a diode from being overheated to a predetermined temperature or higher.

前述のＰＮＰ型トランジスター２７は、温度センサ２５のスイッチ２５ｂが接点２５ａ，２５ａから離れてＯＦＦ状態に自動復帰しているとき、電源スイッチ９を手動でＯＮ操作すると、エミッタ２７ａには、Ｖｃｃ２６から供給される電圧（略５Ｖ）が直接付加され、ベース２７ｂには、第１抵抗２８と第２抵抗２９の抵抗値に応じた電圧（略４．２Ｖ）が付加され、エミッタ２７ａとベース２７ｂとに付加される電圧に略０．７Ｖ以上（トランジスターの作動電圧）の差が生じるため、エミッタ２７ａからコレクタ２７ｃへの通電を可能にする。 When the power switch 9 is manually turned on when the switch 25b of the temperature sensor 25 is automatically returned to the OFF state when the switch 25b of the temperature sensor 25 is separated from the contacts 25a and 25a, the emitter 27a is supplied from the Vcc 26. Voltage (approx. 5V) is directly applied, and a voltage (approx. 4.2V) corresponding to the resistance values of the first resistor 28 and the second resistor 29 is added to the base 27b, and the emitter 27a and the base 27b are applied to each other. Since a difference of approximately 0.7 V or more (transistor operating voltage) is generated in the applied voltage, energization from the emitter 27a to the collector 27c is enabled.

また、温度センサ２５の接点２５ａ，２５ａがスイッチ２５ｂで通電可能なＯＮ状態に接続されているとき、第１抵抗２８を通過せずに、Ｖｃｃ２６から供給される略同一の電圧（略５Ｖ）がエミッタ２７ａ及びベース２７ｂに付加され、エミッタ２７ａからコレクタ２７ｃへの通電を遮断する。 In addition, when the contacts 25a and 25a of the temperature sensor 25 are connected to an ON state in which the switch 25b can be energized, substantially the same voltage (approximately 5V) supplied from the Vcc 26 is not passed through the first resistor 28. It is added to the emitter 27a and the base 27b and cuts off the current from the emitter 27a to the collector 27c.

図示実施例は上記の如く構成するものにして、以下、電気ヒーター１に備えられた過熱防止回路２４の動作を説明する。 The illustrated embodiment is configured as described above, and the operation of the overheat prevention circuit 24 provided in the electric heater 1 will be described below.

先ず、発熱部３を構成する反射板１５の頂上部が所定温度以下であり、温度センサ２５の接点２５ａ，２５ａが通電不可なＯＦＦ状態であり、ＰＩＣ回路２３を構成するマスターリセット端子２３ａがリセット状態（電源ＯＮ状態）で、図３に示すＰ点においてリセット（電源ＯＦＦ状態）されるまでに、電源スイッチ９を手動でＯＮ操作すると、発熱部３を構成する発熱ユニット１８から放射される熱（遠赤外線）が反射板１５により集熱して略前方に向けて反射され、所望する場所又は範囲を、発熱ユニット１８の発熱ヒーター２１が放射する熱により予め設定した時間、所定温度に暖房することができる。 First, the top of the reflector 15 constituting the heat generating part 3 is below a predetermined temperature, the contacts 25a and 25a of the temperature sensor 25 are in an OFF state in which current cannot be passed, and the master reset terminal 23a constituting the PIC circuit 23 is reset. If the power switch 9 is manually turned ON before being reset (power OFF state) at the point P shown in FIG. 3 in the state (power ON state), the heat radiated from the heat generating unit 18 constituting the heat generating unit 3 (Far-infrared rays) are collected by the reflecting plate 15 and reflected substantially forward, and a desired place or range is heated to a predetermined temperature for a preset time by heat radiated by the heating heater 21 of the heating unit 18. Can do.

暖房時間が長くなると、発熱ユニット１８から放射される熱により過熱しやすい反射板１５の頂上部に蓄熱され、反射板１５の頂上部が所定温度以上（異常温度＝略１１０℃）に上昇したとき、その温度変化を検知する温度センサ２５の接点２５ａ，２５ａにスイッチ２５ｂが接触して、回線２５ｃ，２５ｃを通電可能なＯＮ状態に接続する。 When the heating time is lengthened, heat is stored on the top of the reflector 15 which is easily overheated by the heat radiated from the heat generating unit 18, and the top of the reflector 15 rises above a predetermined temperature (abnormal temperature = approximately 110 ° C.). The switch 25b comes in contact with the contacts 25a and 25a of the temperature sensor 25 that detects the temperature change, and connects the lines 25c and 25c to the ON state in which the energization is possible.

温度センサ２５の接点２５ａ，２５ａが通電可能に接続されることにより、Ｖｃｃ２６から供給される電流がＰＮＰ型トランジスター２７のエミッタ２７ａとベース２７ｂとに送られ、第１抵抗２８を通過せずに、Ｖｃｃ２６から供給される略同一の電圧（略５Ｖ）がエミッタ２７ａ及びベース２７ｂに付加され、エミッタ２７ａからコレクタ２７ｃへの通電が遮断される。且つ、温度センサ２５の接点２５ａ，２５ａを接続したときに発生する信号がＰＩＣ回路２３のマスターリセット端子２３ａに出力され、図３に示すＰ点において、ＰＩＣ回路２３のマスターリセット端子２３ａを各部への通電が遮断される状態にリセット（電源ＯＦＦ状態）し、発熱部３を構成する発熱ユニット１８への通電を遮断して、発熱作用を停止する。 By connecting the contacts 25a and 25a of the temperature sensor 25 so that energization is possible, the current supplied from the Vcc 26 is sent to the emitter 27a and the base 27b of the PNP transistor 27, and does not pass through the first resistor 28. The substantially same voltage (approximately 5V) supplied from the Vcc 26 is applied to the emitter 27a and the base 27b, and the energization from the emitter 27a to the collector 27c is cut off. In addition, a signal generated when the contacts 25a, 25a of the temperature sensor 25 are connected is output to the master reset terminal 23a of the PIC circuit 23, and at the point P shown in FIG. 3, the master reset terminal 23a of the PIC circuit 23 is sent to each part. Is reset (power OFF state), the power supply to the heat generating unit 18 constituting the heat generating unit 3 is cut off, and the heat generating action is stopped.

つまり、反射板１５の頂上部が所定温度以下に低下し、温度センサ２５がＯＦＦ状態に自動復帰するまで、ＰＩＣ回路２３を構成するマスターリセット端子２３ａのリセット状態が解除されず、電気ヒーター１を構成する各部への通電遮断状態が継続されるため、図３に示すＮ点において、ＰＩＣ回路２３を構成するマスターリセット端子２３ａのリセット状態が解除（電源ＯＮ状態）されるまで、電源スイッチ９を手動でＯＮ操作しても、各部に通電されず、発熱部３の発熱ユニット１８が勝手に発熱するのを防止することができる。 That is, the reset state of the master reset terminal 23a constituting the PIC circuit 23 is not released until the top of the reflecting plate 15 falls below a predetermined temperature and the temperature sensor 25 automatically returns to the OFF state. Since the energization cut-off state to each component is continued, the power switch 9 is kept until the reset state of the master reset terminal 23a constituting the PIC circuit 23 is released (power ON state) at the point N shown in FIG. Even if it is manually turned ON, each part is not energized, and the heat generating unit 18 of the heat generating part 3 can be prevented from generating heat without permission.

一方、反射板１５の頂上部が所定温度以下に低下し、その温度変化を検知した温度センサ２５のスイッチ２５ｂが接点２５ａ，２５ａから離れてＯＦＦ状態に自動復帰又は自動復旧すると、回線２５ｃ，２５ｃが通電不可なＯＦＦ状態に遮断される。ＰＮＰ型トランジスター２７のエミッタ２７ａには、Ｖｃｃ２６から供給される略５Ｖの電圧が直接付加され、ベース２７ｂには、第１抵抗２８と第２抵抗２９の抵抗値に応じた略４．２Ｖの電圧が付加されるため、ＰＮＰ型トランジスター２７のエミッタ２７ａ及びベース２７ｂに付加される電圧に略０．７Ｖ以上（トランジスターの作動電圧）の差が生じ、エミッタ２７ａからコレクタ２７ｃへ通電が可能となる。 On the other hand, when the top of the reflector 15 drops below a predetermined temperature and the switch 25b of the temperature sensor 25 that detects the temperature change leaves the contacts 25a and 25a and automatically returns to the OFF state or automatically recovers, the lines 25c and 25c Is cut off in the OFF state where current cannot be supplied. A voltage of approximately 5 V supplied from Vcc 26 is directly applied to the emitter 27a of the PNP transistor 27, and a voltage of approximately 4.2V corresponding to the resistance values of the first resistor 28 and the second resistor 29 is applied to the base 27b. Therefore, a difference of approximately 0.7 V or more (transistor operating voltage) is generated in the voltages applied to the emitter 27a and the base 27b of the PNP transistor 27, and current can be supplied from the emitter 27a to the collector 27c.

温度センサ２５の接点２５ａ，２５ａを接続したときに発生する信号がＰＩＣ回路２３に出力されず、Ｖｃｃ２６から供給される電流が、ＰＮＰ型トランジスター２７のエミッタ２７ａからコレクタ２７ｃに流れて、図３に示すＮ点において、ＰＩＣ回路２３を構成するマスターリセット端子２３ａが各部への通電が可能な状態にリセット解除（電源ＯＮ状態）され、電気ヒーター１を構成する各部が通常のスイッチ操作で通電可能な待機状態又は入力待ち状態に復帰する。 A signal generated when the contacts 25a and 25a of the temperature sensor 25 are connected is not output to the PIC circuit 23, and a current supplied from the Vcc 26 flows from the emitter 27a to the collector 27c of the PNP transistor 27, and is shown in FIG. At the indicated N point, the master reset terminal 23a constituting the PIC circuit 23 is reset (powered on) so that each part can be energized, and each part constituting the electric heater 1 can be energized by a normal switch operation. Return to standby state or input wait state.

つまり、電源スイッチ９を、手動又はリモコン等による通常のスイッチ操作でＯＮ操作すれば、発熱部３を構成する発熱ユニット１８から放射される熱で所望する場所及び範囲を暖めることができる。 In other words, if the power switch 9 is turned on manually or by a normal switch operation using a remote controller or the like, the desired place and range can be warmed by the heat radiated from the heat generating unit 18 constituting the heat generating unit 3.

以上のように、発熱部３から放射される熱で過熱しやすい反射板１５の頂上部が所定温度以上に上昇すると、温度センサ２５がＯＮ状態となり、ＰＩＣ回路２３を構成するマスターリセット端子２３ａがリセットされ、手動による通常のスイッチ操作で駆動することが不可能となる。一方、反射板１５の頂上部が所定温度以下に低下すると、温度センサ２５がＯＦＦ状態に自動復帰し、ＰＩＣ回路２３を構成するマスターリセット端子２３ａのリセット状態が解除されるので、電気ヒーター１を構成する各部が通常のスイッチ操作で通電可能な待機状態に復帰するが、電源スイッチ９を、手動でＯＮ操作しなければ発熱部３に通電されず、従来例のように温度センサ２５が自動復帰すると同時に、発熱部３が勝手に発熱するようなことがなく、誤動作が防止され、高い信頼性及び安全性を得ることができる。また、温度センサ２５がＯＦＦ状態に自動復帰し、ＰＩＣ回路２３のリセット状態が解除されなければ、電源スイッチ９をＯＮ操作しても発熱部３に通電されない。 As described above, when the top of the reflector 15 that is easily overheated by the heat radiated from the heat generating unit 3 rises to a predetermined temperature or more, the temperature sensor 25 is turned on, and the master reset terminal 23a constituting the PIC circuit 23 is turned on. It is reset and cannot be driven by a normal manual switch operation. On the other hand, when the top of the reflector 15 falls below a predetermined temperature, the temperature sensor 25 automatically returns to the OFF state, and the reset state of the master reset terminal 23a constituting the PIC circuit 23 is released. Each component is returned to a standby state in which it can be energized by normal switch operation. However, unless the power switch 9 is manually turned on, the heat generating unit 3 is not energized, and the temperature sensor 25 is automatically restored as in the conventional example. At the same time, the heat generating part 3 does not generate heat arbitrarily, so that a malfunction is prevented and high reliability and safety can be obtained. Further, if the temperature sensor 25 automatically returns to the OFF state and the reset state of the PIC circuit 23 is not released, the heat generating unit 3 is not energized even if the power switch 9 is turned ON.

また、各部が通常のスイッチ操作で通電可能な待機状態に復帰した後、発熱部３を発熱させる必要であれば電源スイッチ９を手動でＯＮ操作し、不要であれば電源スイッチ９をＯＮ操作する必要が無く、発熱部３を発熱させるか否かを選択することができる。また、通常の通電可能な状態に復帰させるために特別な部品を交換する必要がなく、通常のスイッチ操作で再使用することができる。 In addition, after each part returns to a standby state in which it can be energized by normal switch operation, the power switch 9 is manually turned on if necessary to heat the heat generating part 3, and the power switch 9 is turned on if unnecessary. There is no need to select whether or not the heat generating unit 3 generates heat. Further, it is not necessary to replace special parts in order to return to a normal energized state, and can be reused by a normal switch operation.

また、温度センサ２５の接点２５ａ，２５ａは信号を出力するものであり、大電流を通電又は遮断するものではないので、寿命が長く、コストの低減を図ることができる。また、温度センサ２５を、ＰＮＰ型トランジスター２７のエミッタ２７ａとベース２７ｂとの間に接続するので、過熱を防止する回路の実装やプログラムの変更無しで、過熱防止機能を簡単に取り付けることができる。 Further, since the contacts 25a and 25a of the temperature sensor 25 output signals and do not energize or cut off a large current, the service life is long and the cost can be reduced. Further, since the temperature sensor 25 is connected between the emitter 27a and the base 27b of the PNP transistor 27, it is possible to easily attach the overheat prevention function without mounting a circuit for preventing overheating or changing the program.

図４は、ＮＰＮ型トランジスター３７を備えた過熱防止回路２４の回路構成を示し、温度センサ２５の回線２５ｃを、ＮＰＮ型トランジスター３７のエミッタ３７ａとベース３７ｂとに接続し、ＰＩＣ回路２３のマスターリセット端子２３ａを、回線３７ｄを介してＮＰＮ型トランジスター３７のエミッタ３７ａに接続している。 FIG. 4 shows a circuit configuration of the overheat prevention circuit 24 including the NPN transistor 37. The circuit 25c of the temperature sensor 25 is connected to the emitter 37a and the base 37b of the NPN transistor 37, and the master reset of the PIC circuit 23 is performed. The terminal 23a is connected to the emitter 37a of the NPN transistor 37 via a line 37d.

つまり、温度センサ２５がＯＮ状態に変位したとき、ＮＰＮ型トランジスター３７のエミッタ３７ａとベース３７ｂとに略同一の電圧を付加して、Ｖｃｃ２６が接続されたコレクタ３７ｃからエミッタ３７ａへの通電を遮断すると共に、温度センサ２５のＯＮ状態時に出力される信号でＰＩＣ回路２３のマスターリセット端子２３ａを各部への通電が遮断される状態にリセットする。 That is, when the temperature sensor 25 is displaced to the ON state, substantially the same voltage is applied to the emitter 37a and the base 37b of the NPN transistor 37 to cut off the energization from the collector 37c to which the Vcc 26 is connected to the emitter 37a. At the same time, the master reset terminal 23a of the PIC circuit 23 is reset to a state where the power supply to each part is cut off by a signal output when the temperature sensor 25 is in the ON state.

また、温度センサ２５がＯＦＦ状態に自動復帰したとき、ＮＰＮ型トランジスター３７のエミッタ３７ａとベース３７ｂとに異なる電圧を付加して、Ｖｃｃ２６が接続されたコレクタ３７ｃからエミッタ３７ａへの通電を可能にすると共に、温度センサ２５のＯＦＦ状態に信号を出力せず、ＰＩＣ回路２３のマスターリセット端子２３ａを各部への通電が可能な状態にリセット解除するので、上述の実施例と略同等の作用及び効果を奏することができる。なお、上述の実施例と同一構成の部分は同一の符号を記してその詳細な説明を省略する。 Further, when the temperature sensor 25 automatically returns to the OFF state, different voltages are applied to the emitter 37a and the base 37b of the NPN transistor 37 so that the current can be supplied from the collector 37c to which the Vcc 26 is connected to the emitter 37a. In addition, since the master reset terminal 23a of the PIC circuit 23 is released from the reset to a state in which power can be supplied to each part without outputting a signal to the OFF state of the temperature sensor 25, the operation and effect substantially the same as those of the above-described embodiments are achieved. Can play. In addition, the same code | symbol is attached | subjected to the part of the same structure as the above-mentioned Example, and the detailed description is abbreviate | omitted.

この発明の構成と、上述の実施例との対応において、
この発明の発熱装置は、実施例の電気ヒーター１に対応するも、
この発明は、上述の実施例の構成のみに限定されるものではない。 In the correspondence between the configuration of the present invention and the above-described embodiment,
The heating device of the present invention corresponds to the electric heater 1 of the embodiment,
The present invention is not limited to the configuration of the above-described embodiment.

本願発明の過熱防止回路は、例えば電気ストーブや電気火鉢、電気アンカ等の発熱機能を有するその他の発熱装置にも適用することができる。 The overheat prevention circuit of the present invention can be applied to other heat generating devices having a heat generating function such as an electric stove, an electric brazier, and an electric anchor.

過熱防止回路を備えた電気ヒーターを示す断面図。Sectional drawing which shows the electric heater provided with the overheat prevention circuit. ＰＮＰ型トランジスターを備えた過熱防止回路の構成を示す回路図。The circuit diagram which shows the structure of the overheat prevention circuit provided with the PNP type transistor. ＰＩＣ回路及び発熱ヒーターの動作パターンを示す説明図。Explanatory drawing which shows the operation pattern of a PIC circuit and a heater. ＮＰＮ型トランジスターを備えた過熱防止回路の構成を示す回路図。The circuit diagram which shows the structure of the overheat prevention circuit provided with the NPN-type transistor.

Explanation of symbols

１…電気ヒーター
３…発熱部
９…電源スイッチ
１５…反射板
１８…発熱ユニット
２１…発熱ヒーター
２２…制御部
２３…ＰＩＣ回路
２３ａ…マスターリセット端子
２４…過熱防止回路
２５…温度センサ
２６…Ｖｃｃ
２７…ＰＮＰ型トランジスター
２７ａ…エミッタ
２７ｂ…ベース
２７ｃ…コレクタ
２８…第１抵抗
２９…第２抵抗
３０…第３抵抗
３１…コンデンサー
３７…ＮＰＮ型トランジスター
３７ａ…エミッタ
３７ｂ…ベース
３７ｃ…コレクタ
DESCRIPTION OF SYMBOLS 1 ... Electric heater 3 ... Heat generating part 9 ... Power switch 15 ... Reflector 18 ... Heat generating unit 21 ... Heat generating heater 22 ... Control part 23 ... PIC circuit 23a ... Master reset terminal 24 ... Overheat prevention circuit 25 ... Temperature sensor 26 ... Vcc
27 ... PNP transistor 27a ... emitter 27b ... base 27c ... collector 28 ... first resistor 29 ... second resistor 30 ... third resistor 31 ... capacitor 37 ... NPN transistor 37a ... emitter 37b ... base 37c ... collector

Claims

An overheat prevention circuit provided in a heating device that appropriately heats a desired part or range with heat radiated from a heating part,
A temperature sensor that detects the temperature of the portion that is likely to overheat by the heat radiated from the heat generating portion is connected to the emitter and base of the PNP transistor,
A master reset terminal of a PIC circuit that controls energization to each part of the heat generating device is connected to a collector of the PNP transistor,
When the part that is likely to overheat rises above a predetermined temperature and the temperature sensor that detects the temperature of the part is displaced to the ON state, substantially the same voltage is applied to the emitter and base of the PNP transistor, Reset the master reset terminal of the PIC circuit to the state where the power supply to each of the above parts is cut off by the output signal,
When the part that tends to overheat falls below a predetermined temperature and the temperature sensor that detects the temperature of the part returns to the OFF state, a different voltage is added to the emitter and base of the PNP transistor,
An overheat prevention circuit that releases the reset of the master reset terminal of the PIC circuit to a state in which power can be supplied to each of the parts, and returns to a standby state in which power can be supplied by a manual switch operation.

An overheat prevention circuit provided in a heating device that appropriately heats a desired part or range with heat radiated from a heating part,
A temperature sensor that detects the temperature of a portion that is likely to be overheated by heat radiated from the heat generating portion is connected to the emitter and base of an NPN transistor,
A master reset terminal of a PIC circuit that controls energization to each part of the heat generating device is connected to an emitter of the NPN transistor,
When the part that is likely to overheat rises above a predetermined temperature and the temperature sensor that detects the temperature of the part is displaced to the ON state, substantially the same voltage is applied to the emitter and base of the NPN transistor. Reset the master reset terminal of the PIC circuit to the state where the power supply to each of the above parts is cut off by the output signal,
When the part that tends to overheat falls below a predetermined temperature and the temperature sensor that detects the temperature of the part returns to the OFF state, a different voltage is added to the emitter and base of the NPN transistor,
An overheat prevention circuit that releases the reset of the master reset terminal of the PIC circuit to a state in which power can be supplied to each of the parts, and returns to a standby state in which power can be supplied by a manual switch operation.

The overheat prevention circuit according to claim 1 or 2, wherein the temperature sensor is provided on the top of a reflector plate that is easily overheated by heat radiated from the heat generating portion.

The overheat prevention circuit according to claim 1, 2 or 3, wherein the temperature sensor comprises an automatic reset thermostat that returns to an OFF state when a portion that is likely to be overheated by heat radiated from the heat generating portion falls below a predetermined temperature. .