CN202255641U - Temperature warning direct-current circuit - Google Patents
Temperature warning direct-current circuit Download PDFInfo
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- CN202255641U CN202255641U CN2011202920128U CN201120292012U CN202255641U CN 202255641 U CN202255641 U CN 202255641U CN 2011202920128 U CN2011202920128 U CN 2011202920128U CN 201120292012 U CN201120292012 U CN 201120292012U CN 202255641 U CN202255641 U CN 202255641U
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Abstract
The utility model belongs to the field of industrial control, control of various types of high temperature heating and the like, in particular to a temperature warning direct-current circuit for a portable temperature check gauge (dry furnace), which is used for realizing power-down temperature measurement warning for the portable temperature check gauge (dry furnace). The circuit comprises a diode D1, a diode D2, an internal power supply BAT1, a voltage-stabilizing circuit, an in-phase proportional amplifier, a voltage comparator and an LED (Light-Emitting Diode) driving circuit. The temperature warning direct-current circuit has the beneficial effects that: a two-path power supply technology is adopted, the structure is simple, high stability is achieved, temperature warning can be performed normally when an external power supply is switched off, and the aim of preventing operating personnel from being scalded by high temperature is fulfilled.
Description
Technical field
The utility model belongs to control fields such as Industry Control, various heat; Specifically be meant a kind of DC circuit that is used for portable temperature tester (stem body stove) temperature alarming, realization is to the DC circuit of the temperature alarming of the outage thermometric warning of portable temperature tester (stem body stove).
Background technology
Temperature alarm circuit of the prior art, circuit structure is complicated, temperature-measuring range is little, reaction velocity is slow, the not high defective of stability; Of paramount importance is can't operate as normal after the outage, makes the have a surplus high-temperature device of temperature of operation or other staff's contact zones cause scalding.
Summary of the invention
In order to address the above problem, the utility model purpose be to provide a kind of simple in structure, stability is high, cut off the DC circuit of the temperature alarming that external power source can also operate as normal.
The technical scheme of the utility model is: a kind of DC circuit of temperature alarming, this circuit comprise diode D1, D2, built-in power BAT1, mu balanced circuit, in-phase proportion amplifier, voltage comparator and led drive circuit composition;
Wherein, said mu balanced circuit comprises C1, C2, C3, C4, C5 and U3;
Said voltage comparator is by R4, R5, R6 and U2;
Said in-phase proportion amplifier comprises R1, R2, R3 and U1;
Said led drive circuit comprises R7, LED1 and Q1;
Said diode D1+utmost point links to each other with civil power+5V; Said diode D2+utmost point links to each other with said built-in power BAT1; The negative pole of said diode D1 and said diode D2 and Lian Houzai and said C1 and C2+the 1st pin of the utmost point, said U3 links to each other with the 3rd pin; Said C1 and C2-utmost point is connected to power supply ground respectively; Said C4+utmost point and the 5th pin of linking said U3 after said C3 and C5 one end are parallelly connected, the other end of said C3 links to each other with the 4th pin of said U3, said C4-utmost point be connected to power supply ground after the other end of said C5 is parallelly connected; The end of said R1 links to each other with the 3rd pin of said U1, the other end and thermopair+utmost point is connected; The end of said R2 and thermopair-utmost point is connected and connects power supply ground simultaneously; The other end and the 2nd pin that is connected to said U1 after the end of said R3 is connected; Simultaneously the other end of said R3 with link to each other with the 5th pin of said U2 again after the 6th pin of said U1 links to each other; The 7th pin of said U1 is linked the 5th pin of said U3, and the 4th pin of said U1 is linked power supply ground; Said R4 one end is linked the 5th pin of U3; The other end and the 6th pin that is connected to said U2 after the end of said R5 is connected; Simultaneously the said R5 other end is linked power supply ground, and said R6 one end is linked the 5th pin of U3, the other end of said R6 with link to each other with the Q1 base stage again after the 7th pin of said U2 links to each other; The 8th pin of U2 is linked the 5th pin of U3, and the 4th pin of U2 is linked power supply ground; Said R7 one end is linked the 5th pin of said U3, the other end of said R7 and said LED1+utmost point is connected, said LED1-utmost point links to each other with the collector of Q1, and the emitter of Q1 links to each other with power supply ground.
The beneficial effect of the utility model is: this practical employing duplex feeding technology, and simple in structure, stability is high, cut off the temperature alarming that external power source can also operate as normal, reaches the purpose that operating personnel are not scalded by high temperature.
Description of drawings
Fig. 1 is the DC circuit theory diagram of the utility model temperature alarming.
Embodiment
Figs further specifies technical scheme of the present invention.
As shown in Figure 1; The DC circuit of a kind of temperature alarming of the utility model; This circuit is connected between thermopair (temperature probe) and the power supply, and this circuit comprises diode D1, D2, built-in power BAT1, mu balanced circuit, in-phase proportion amplifier, voltage comparator and led drive circuit composition;
Mu balanced circuit comprises C1, C2, C3, C4, C5 and U3;
Voltage comparator is by R4, R5, R6 and U2;
The in-phase proportion amplifier comprises R1, R2, R3 and U1;
Led drive circuit comprises R7, LED1 and Q1;
Wherein, Diode D1+utmost point links to each other with civil power+5V, diode D2+utmost point links to each other with built-in power BAT1, the negative pole of diode D1 and diode D2 and Lian Houzai and C1 and C2+utmost point, the 1st pin of stating U3 link to each other with the 3rd pin; C1 and C2-utmost point is connected to power supply ground respectively; 4+utmost point and the 5th pin of linking U3 after C3 and C5 one end are parallelly connected, the other end of C3 links to each other with the 4th pin of U3, C4-utmost point be connected to power supply ground after the other end of C5 is parallelly connected; The end of R1 links to each other with the 3rd pin of U1, the other end and thermopair+utmost point is connected; The end of R2 and thermopair-utmost point is connected and connects power supply ground simultaneously; The other end and the 2nd pin that is connected to U1 after the end of R3 is connected; Simultaneously the other end of R3 with link to each other with the 5th pin of U2 again after the 6th pin of U1 links to each other, the 7th pin of U1 is linked the 5th pin of U3, the 4th pin of U1 is linked power supply ground; R4 one end is linked+3.3V; The other end and the 6th pin that is connected to U2 after the end of R5 is connected; Simultaneously the said R5 other end is linked power supply ground, and R6 one end is linked+3.3V, the other end of R6 with link to each other with the Q1 base stage again after the 7th pin of said U2 links to each other; The 8th pin of U2 is linked+3.3V, and the 4th pin of U2 is linked power supply ground; R7 one end is linked the 5th pin of U3, the other end of said R7 and LED1+utmost point is connected, ED1-utmost point links to each other with the collector of Q1, and the emitter of Q1 links to each other with power supply ground.
The utility model principle of work is: this circuit is connected between thermopair (temperature probe) and the power supply; Circuit+the 5.0V power supply; By obtaining after civil power transformation, the voltage stabilizing, get into through catching diode D1, for improving the job stability of system voltage; Adopt low noise, LDO type voltage stabilizing chip U3 (LT1761) to obtain the WV+3.3V of circuit in the circuit, C1, C2, C3, C4 and C5 accomplish filter function and reduce circuit noise.Resistance R 1, R2, R3 and U1 (OPA335) form the in-phase proportion amplifier; Deliver to the U+ end of forming voltage comparator by precision resistance R4, R5 and U2 (LM293) after the voltage signal of temperature probe amplified; U-terminal voltage value (being the voltage of temperature alarming point) is obtained by precision resistance R4, R5 dividing potential drop, when U+ during U-, the comparer output low level; Triode Q1 is operated in cut-off state, and LED1 does not work; As U+>during U-, comparer output high level, triode Q1 is operated in state of saturation, and driving LED 1 is bright, promptly accomplishes the alerting signal prompt facility.R6 is the OC door output pull-up resistor of U2 (LM293) in the circuit, and R7, LED1 and Q1 form led drive circuit, and wherein R7 is the current-limiting resistance of LED1.When civil power was closed, Circuits System was battery-powered, got into completion+5.0V power supply and battery operated switching through diode D2.
Claims (1)
1. the DC circuit of a temperature alarming is characterized in that, this circuit comprises diode D1, D2, built-in power BAT1, mu balanced circuit, in-phase proportion amplifier, voltage comparator and led drive circuit composition;
Said mu balanced circuit comprises C1, C2, C3, C4, C5 and U3;
Said voltage comparator is by R4, R5, R6 and U2;
Said in-phase proportion amplifier comprises R1, R2, R3 and U1;
Said led drive circuit comprises R7, LED1 and Q1;
Wherein, Said diode D1+utmost point links to each other with civil power+5V; Said diode D2+utmost point links to each other with said built-in power BAT1; The negative pole of said diode D1 and said diode D2 and Lian Houzai and said C1 and C2+the 1st pin of the utmost point, said U3 links to each other with the 3rd pin, said C1 and C2-utmost point is connected to power supply ground respectively, said C4+utmost point and the 5th pin of linking said U3 after said C3 and C5 one end are parallelly connected; The other end of said C3 links to each other with the 4th pin of said U3, said C4-utmost point be connected to power supply ground after the other end of said C5 is parallelly connected; The end of said R1 links to each other with the 3rd pin of said U1, the other end and thermopair+utmost point is connected; The end of said R2 and thermopair-utmost point is connected and connects power supply ground simultaneously; The other end and the 2nd pin that is connected to said U1 after the end of said R3 is connected; Simultaneously the other end of said R3 with link to each other with the 5th pin of said U2 again after the 6th pin of said U1 links to each other; The 7th pin of said U1 is linked the 5th pin of said U3, and the 4th pin of said U1 is linked power supply ground; Said R4 one end is linked the 5th pin of U3, the other end and the 6th pin that is connected to said U2 after the end of said R5 is connected, and the said R5 other end is linked power supply ground simultaneously; Said R6 one end is linked the 5th pin of U3; The other end of said R6 with link to each other with the Q1 base stage again after the 7th pin of said U2 links to each other, the 8th pin of U2 is linked the 5th pin of U3, the 4th pin of U2 is linked power supply ground; Said R7 one end is linked the 5th pin of said U3; The other end of said R7 and said LED1+utmost point is connected, said LED1-utmost point links to each other with the collector of Q1, and the emitter of Q1 links to each other with power supply ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202920128U CN202255641U (en) | 2011-08-12 | 2011-08-12 | Temperature warning direct-current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202920128U CN202255641U (en) | 2011-08-12 | 2011-08-12 | Temperature warning direct-current circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202255641U true CN202255641U (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202920128U Expired - Lifetime CN202255641U (en) | 2011-08-12 | 2011-08-12 | Temperature warning direct-current circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN202255641U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017928A (en) * | 2012-12-04 | 2013-04-03 | 杭州成功超声电源技术有限公司 | Ultrasonic power supply temperature detection circuit |
| CN103728039A (en) * | 2013-11-15 | 2014-04-16 | 成都市宏山科技有限公司 | Busbar temperature rise warning detection device based on thermocouple |
| CN105698935A (en) * | 2016-03-29 | 2016-06-22 | 国网甘肃省电力公司电力科学研究院 | Transformer top-layer oil temperature measuring and early-warning device and early-warning method thereof |
| CN108120929A (en) * | 2017-12-23 | 2018-06-05 | 郑州默尔电子信息技术有限公司 | A kind of stirring motor running safety monitoring device |
| CN108183274A (en) * | 2017-12-11 | 2018-06-19 | 厦门盈趣科技股份有限公司 | The calandria of high temperature alarm after power-off |
-
2011
- 2011-08-12 CN CN2011202920128U patent/CN202255641U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017928A (en) * | 2012-12-04 | 2013-04-03 | 杭州成功超声电源技术有限公司 | Ultrasonic power supply temperature detection circuit |
| CN103728039A (en) * | 2013-11-15 | 2014-04-16 | 成都市宏山科技有限公司 | Busbar temperature rise warning detection device based on thermocouple |
| CN105698935A (en) * | 2016-03-29 | 2016-06-22 | 国网甘肃省电力公司电力科学研究院 | Transformer top-layer oil temperature measuring and early-warning device and early-warning method thereof |
| CN108183274A (en) * | 2017-12-11 | 2018-06-19 | 厦门盈趣科技股份有限公司 | The calandria of high temperature alarm after power-off |
| CN108120929A (en) * | 2017-12-23 | 2018-06-05 | 郑州默尔电子信息技术有限公司 | A kind of stirring motor running safety monitoring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120530 |