JPS6224732B2 - - Google Patents
Info
- Publication number
- JPS6224732B2 JPS6224732B2 JP54130325A JP13032579A JPS6224732B2 JP S6224732 B2 JPS6224732 B2 JP S6224732B2 JP 54130325 A JP54130325 A JP 54130325A JP 13032579 A JP13032579 A JP 13032579A JP S6224732 B2 JPS6224732 B2 JP S6224732B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- light emitting
- resistance value
- ptc thermistor
- emitting diode
- 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
Links
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Description
【発明の詳細な説明】
本発明は安価にかつ高信頼度の無接点式温度表
示装置を提供せんとするもので、目的物がある温
度範囲にあることを表示するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention aims to provide an inexpensive and highly reliable non-contact type temperature display device that indicates that an object is within a certain temperature range.
従来、この目的のためには２つの温度センサと
リレーあるいはトランジスタ回路等を組合わせ
て、ある２点の温度範囲にあることを表示しよう
としたものがあるが、価格が高く、かつリレー等
を用いたものは信頼度が低かつた。 Conventionally, for this purpose, there has been an attempt to display that the temperature is within a certain two point range by combining two temperature sensors and a relay or transistor circuit, but this is expensive and requires relays, etc. The ones used had low reliability.
本発明は構成が簡単で、接点を用いないため、
高信頼性で長寿命な無接点式温度表示装置を提案
するものである。 Since the present invention has a simple configuration and does not use contacts,
This project proposes a highly reliable and long-life non-contact temperature display device.
すなわち、本発明は上限の温度を検知する正特
性サーミスタ（以下PTCサーミスタという）
と、下限の温度を検知するPTCサーミスタと、
電流により発光する発光ダイオードとか低電流で
動作するランプ等の第１の発光素子とを直列に接
続し、かつ下限の温度を検知するPTCサーミス
タにも並列に第２の発光素子を接続し、これらの
回路の両端に電圧を加えたもので第１図のような
構成となる。図中、１は抵抗値急変温度の高い
PTCサーミスタ、２はPTCサーミスタ１と直列
に接続された抵抗値急変温度の低いPTCサーミ
スタ、３はこの下限の温度を検知するPTCサー
ミスタ２と並列に接続された発光ダイオード、５
は両PTCサーミスタ１，２と直列に接続された
温度が下限よりも下にあることを表示するダイオ
ード、４はDC電源を示す。また、第２図に両
PTCサーミスタ１，２の温度と抵抗値の関係を
示している。 In other words, the present invention is a positive characteristic thermistor (hereinafter referred to as a PTC thermistor) that detects the upper limit temperature.
and a PTC thermistor that detects the lower temperature limit.
A first light-emitting element such as a light-emitting diode that emits light using current or a lamp that operates at low current is connected in series, and a second light-emitting element is also connected in parallel to a PTC thermistor that detects the lower limit temperature. A voltage is applied to both ends of the circuit, and the configuration is as shown in Figure 1. In the diagram, 1 indicates a high temperature with a sudden change in resistance value.
PTC thermistor, 2 is a PTC thermistor with a low resistance value sudden change temperature connected in series with PTC thermistor 1, 3 is a light emitting diode connected in parallel with PTC thermistor 2 that detects this lower limit temperature, 5
is a diode connected in series with both PTC thermistors 1 and 2 to indicate that the temperature is below the lower limit, and 4 is a DC power supply. Also, Figure 2 shows both
It shows the relationship between the temperature and resistance value of PTC thermistors 1 and 2.
この回路の動作を説明すると、低い温度では両
サーミスタ１，２とも低抵抗で、かつPTCサー
ミスタ２の方の抵抗値をPTCサーミスタ１に比
較して低くしておくと、電圧はPTCサーミスタ
２にはほとんどかからないため、発光ダイオード
３には電流が流れず発光しない。また、両PTC
サーミスタ１，２とも低抵抗であるため、発光ダ
イオード５は発光して温度が下限より下の温度で
あることを表示する。つぎに、温度がPTCサー
ミスタ２の抵抗値急変温度を越えると、このサー
ミスタ２には電流が流れず、発光ダイオード３に
電流が流れて発光し、所定温度に到達したことを
表示する。ここで、PTCサーミスタ１の抵抗値
を適当に選べば発光ダイオード３，５に対しての
電流制限抵抗の役目を果たす。そして、温度が
PTCサーミスタ１の抵抗値急変温度をも越えれ
ば、両PTCサーミスタ１，２とも抵抗値が高く
なり、発光ダイオード３，５は発光しない。すな
わち、PTCサーミスタ１の抵抗値急変温度以下
では発光ダイオード５が発光し、両PTCサーミ
スタ１，２の抵抗値急変温度の間にある時にのみ
発光ダイオード３が発光する温度表示装置を構成
する。第２図に示す特性のPTCサーミスタ１，
２を用いた場合、86℃以下では発光ダイオード５
がONになり、86℃〜100℃では発光ダイオード
３，５がONになる。 To explain the operation of this circuit, at low temperatures, both thermistors 1 and 2 have low resistance, and if the resistance value of PTC thermistor 2 is made lower than that of PTC thermistor 1, the voltage will be applied to PTC thermistor 2. Since almost no current is applied to the light emitting diode 3, no current flows to the light emitting diode 3 and no light is emitted. Also, both PTC
Since both thermistors 1 and 2 have low resistance, the light emitting diode 5 emits light to indicate that the temperature is below the lower limit. Next, when the temperature exceeds the temperature at which the resistance value of the PTC thermistor 2 suddenly changes, no current flows through the thermistor 2, and current flows through the light emitting diode 3, which emits light to indicate that a predetermined temperature has been reached. Here, if the resistance value of the PTC thermistor 1 is appropriately selected, it will serve as a current limiting resistor for the light emitting diodes 3 and 5. And the temperature
If the temperature at which the resistance value of the PTC thermistor 1 suddenly changes is exceeded, the resistance values of both the PTC thermistors 1 and 2 become high, and the light emitting diodes 3 and 5 do not emit light. In other words, the light emitting diode 5 emits light below the temperature at which the resistance value of the PTC thermistor 1 suddenly changes, and the light emitting diode 3 emits light only when the resistance value of the PTC thermistor 1 and 2 is between the temperatures at which the resistance value suddenly changes. PTC thermistor 1 with the characteristics shown in Figure 2,
When 2 is used, the light emitting diode 5 is
is turned on, and light emitting diodes 3 and 5 are turned on at 86°C to 100°C.
第１図におけるPTCサーミスタ１，２の抵抗
値およびその比は、発光ダイオード３の発光開始
電流と最大電流により決定すべきであり、PTC
サーミスタの場合は形状および比抵抗を任意に調
整できるので、目的の抵抗に合わすことができ
る。また、PTCサーミスタ１，２に直列に電流
制限抵抗をつけることも可能である。 The resistance values of PTC thermistors 1 and 2 in FIG. 1 and their ratio should be determined by the light emission starting current and maximum current of the light emitting diode 3,
In the case of a thermistor, the shape and specific resistance can be adjusted arbitrarily, so the desired resistance can be achieved. Further, it is also possible to attach a current limiting resistor in series with the PTC thermistors 1 and 2.
なお、上限温度、下限温度の設定はPTCサー
ミスタ（通常チタン酸バリウム系半導体磁器）の
キユーリー温度を変えることにより、30℃〜350
℃の範囲において任意のものが製造し得る。ま
た、発光素子としては発光ダイオードの他に同じ
く低電流駆動可能な低電流タングステンランプ等
が使用できる。 The upper and lower temperature limits can be set from 30℃ to 350℃ by changing the Curie temperature of the PTC thermistor (usually barium titanate semiconductor porcelain).
Anything within the temperature range can be produced. Further, as the light emitting element, in addition to the light emitting diode, a low current tungsten lamp or the like which can be driven at low current can also be used.
以上のように本発明の無接点式温度表示装置は
構成されているものであり、温度が所定の範囲内
にあるか、またはその範囲以下か以上かの区別を
２つの発光素子の点灯状態で区別できるものであ
り、非常に構成が簡単で安価に提供することがで
き、かつ接点を用いないため、高信頼性で長寿命
の温度表示装置を提供することができるものであ
る。 As described above, the non-contact type temperature display device of the present invention is configured, and it is possible to distinguish whether the temperature is within a predetermined range, or whether it is below or above that range, based on the lighting state of the two light emitting elements. The temperature display device has a very simple structure and can be provided at low cost, and since no contacts are used, it is possible to provide a highly reliable and long-life temperature display device.
第１図は本発明に係る無接点式温度表示装置の
一実施例を示す回路図、第２図は同装置に用いる
PTCサーミスタの温度と抵抗値との関係を示す
図である。
１……抵抗値急変温度の高いPTCサーミス
タ、２……抵抗値急変温度の低いPTCサーミス
タ、３……第２の発光素子（発光ダイオード）、
５……第１の発光素子（発光ダイオード）。
Figure 1 is a circuit diagram showing an embodiment of a non-contact temperature display device according to the present invention, and Figure 2 is a circuit diagram used in the same device.
FIG. 3 is a diagram showing the relationship between temperature and resistance value of a PTC thermistor. 1... PTC thermistor with a high resistance value sudden change temperature, 2... PTC thermistor with a low resistance value sudden change temperature, 3... second light emitting element (light emitting diode),
5...First light emitting element (light emitting diode).
Claims (1)
タの抵抗値急変温度の異なるものと電流により発
光する第１の発光素子を直列に接続し、かつ抵抗
値急変温度の低い方の正特性サーミスタに並列に
電流により発生する第２の発光素子を接続したこ
とを特徴とする無接点式温度表示装置。1 A positive temperature coefficient thermistor whose resistance value suddenly changes depending on temperature is connected in series with a first light emitting element that emits light due to an electric current, and is connected in parallel to the positive temperature coefficient thermistor whose resistance value suddenly changes temperature is lower. A non-contact temperature display device, characterized in that a second light emitting element that is generated by an electric current is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13032579A JPS5653427A (en) | 1979-10-08 | 1979-10-08 | Contact-less type temperature display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13032579A JPS5653427A (en) | 1979-10-08 | 1979-10-08 | Contact-less type temperature display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5653427A JPS5653427A (en) | 1981-05-13 |
| JPS6224732B2 true JPS6224732B2 (en) | 1987-05-29 |
Family
ID=15031639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13032579A Granted JPS5653427A (en) | 1979-10-08 | 1979-10-08 | Contact-less type temperature display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5653427A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5087977U (en) * | 1973-12-07 | 1975-07-25 |
-
1979
- 1979-10-08 JP JP13032579A patent/JPS5653427A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5653427A (en) | 1981-05-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS62271386A (en) | Glass-ceramic system cooking oven | |
| GB950157A (en) | Improvements in or relating to pulsing units | |
| US3404313A (en) | Temperature responsive circuit apparatus employing thermistors | |
| US6291956B1 (en) | Temperature controlled radiating fan | |
| US3727063A (en) | Lighting control device | |
| US4526481A (en) | Engine temperature sensor | |
| US3950741A (en) | Accessory outage monitoring circuitry | |
| JP2002151741A (en) | Light emitting device, mounting substrate, and electronic equipment using the device and substrate | |
| JP2000278859A (en) | Overvoltage protection circuit for LED lighting circuit | |
| US2981866A (en) | Cool dimmer device for incandescent lamps | |
| US4221978A (en) | Electronic time switch | |
| CN108575014B (en) | Circuit for raising current to be stable along with temperature rise by using thermistor PTC | |
| US4117346A (en) | Thermal power sustaining switch | |
| JPS6225838Y2 (en) | ||
| JPS5825600Y2 (en) | Discharge lamp delay extinguishing device | |
| GB2083231A (en) | Engine temperature sensor | |
| JPS5915437Y2 (en) | decorative light bulbs | |
| JPS5854691Y2 (en) | temperature detection circuit | |
| US3860837A (en) | Comfort control system and components thereof | |
| JPS6225837Y2 (en) | ||
| JP7184183B2 (en) | LED drive circuit | |
| JPS5820831Y2 (en) | Jidokankisen | |
| JPS6319844Y2 (en) | ||
| KR930003374Y1 (en) | Upper and Lower Limit Expansion Circuits | |
| SU1177702A1 (en) | Pressure transducer equivalent |