CN201016816Y - Temperature checkout gear - Google Patents
Temperature checkout gear Download PDFInfo
- Publication number
- CN201016816Y CN201016816Y CNU2007200065961U CN200720006596U CN201016816Y CN 201016816 Y CN201016816 Y CN 201016816Y CN U2007200065961 U CNU2007200065961 U CN U2007200065961U CN 200720006596 U CN200720006596 U CN 200720006596U CN 201016816 Y CN201016816 Y CN 201016816Y
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- China
- Prior art keywords
- control chip
- temperature
- temperature sensing
- sensing circuit
- tri
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- 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
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- 238000001514 detection method Methods 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The utility model discloses a temperature detection device, mainly comprising a control chip and a temperature detection circuit. Two output terminals of the control chip are connected with the temperature detection circuit. An input terminal of the control chip is connected with the temperature detection circuit. The utility model mainly comprises the control chip, a tri-state gate circuit and the temperature detection circuit. Temperature signals acquired by the temperature detection circuit are amplified by the tri-state gate circuit signals, transmitted to the control chip and are processed by the control chip. And the present environmental temperature is obtained. Therefore, the device has the advantages of simple structure and high detection precision.
Description
Technical field
The utility model relates to a kind of temperature-detecting device.
Background technology
Temperature-detecting device is widely used in the daily life, and people usually need to know the temperature under the various environment.The temperature-detecting device structure of commonly using is comparatively complicated, and cost is higher.
The utility model content
The purpose of this utility model is to provide a kind of temperature-detecting device with low cost.
For achieving the above object, technical solution of the present utility model is:
The utility model is a kind of temperature-detecting device, and it mainly is made up of control chip and temperature sensing circuit; Two output ports of described control chip connect temperature sensing circuit, the charging and the discharge of control temperature sensing circuit; An input port of control chip connects temperature sensing circuit, reads the numerical value of electric capacity charging level in the temperature sensing circuit.
The utility model also comprises a tri-state gate circuit; Two output ports of described control chip connect temperature sensing circuit by tri-state gate circuit; An input port of control chip connects temperature sensing circuit by tri-state gate circuit.
Described temperature sensing circuit is made up of thermo-sensitive resistor, reference resistance, current-limiting resistance, electric capacity; After described thermo-sensitive resistor, reference resistance, the current-limiting resistance parallel connection and capacitance series.
The other end of described thermo-sensitive resistor, reference resistance, current-limiting resistance connects the output pin and the output pin of control chip respectively by tri-state gate circuit.
After adopting such scheme, because the utility model is made up of control chip, tri-state gate circuit and temperature sensing circuit, the temperature signal that temperature sensing circuit is gathered sends control chip to after the tri-state gate circuit signal amplifies, after control chip is handled, obtain current environment temperature, have advantage simple in structure, that detection accuracy is high.
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, the utility model is a kind of temperature-detecting device, and it mainly is made up of control chip 1, tri-state gate circuit 2, temperature sensing circuit 3 and display circuit 4.
Described temperature sensing circuit 3 is made up of thermo-sensitive resistor Rt, reference resistance Rs, current-limiting resistance Rp, capacitor C t.Be connected in series with capacitor C t after described thermo-sensitive resistor Rt, reference resistance Rs, the current-limiting resistance Rp parallel connection.
The P10 of described control chip 1, P15 pin are controlled the charging and the discharge of temperature sensing circuit 3 by thermo-sensitive resistor Rt and reference resistance Rs that operational amplifier U10A, the U10B of tri-state gate circuit 2 connects temperature sensing circuit 3 respectively.The T0 pin of control chip 1 reads the numerical value of capacitor C t charging level in the temperature sensing circuit 3 by the current-limiting resistance Rp of the operational amplifier U10C connection temperature sensing circuit 3 of tri-state gate circuit 2.
Described display circuit 4 is connected the output terminal of control chip 1.
Is the control chip 1 that the utility model adopts? if, adopt the self-contained control chip that tri-state gate circuit is arranged, the tri-state gate circuit 2 that then can default, and the pin of control chip is directly linked to each other with temperature sensing circuit.
Workflow of the present utility model:
1, control chip 1 starts;
2, open the discharge switch of reference resistance Rs;
3, close after the time-delay;
4, close the discharge switch of reference resistance Rs;
5, open the charge switch of reference resistance Rs;
6, control chip 1 starts timing, reads the charging level of capacitor C t, and level continues to read when very low, and when level was 1 (height), control chip 1 stopped timing, and control chip 1 calculates reading;
7,, calculate the charging coefficient Rcs=Rs/Count of reference resistance Rs according to the calculating reading of control chip 1;
8, carry out the 1-3 step again;
9, open the charge switch of thermo-sensitive resistor Rt;
10, control chip 1 picks up counting, and reads the charging level of capacitor C t.If charging level hangs down then continues to read, if high, control chip 1 stops timing;
11, control chip 1 reads the resistance of duration of charging by Rt=Count*Rcs calculating Current Temperatures;
12, control chip 1 is checked the temperature/resistance table of comparisons of temperature and resistance, obtains current temperature.
Claims (4)
1. temperature-detecting device, it is characterized in that: it mainly is made up of control chip and temperature sensing circuit; Two output ports of described control chip connect temperature sensing circuit, the charging and the discharge of control temperature sensing circuit; An input port of control chip connects temperature sensing circuit, reads the numerical value of electric capacity charging level in the temperature sensing circuit.
2. temperature-detecting device according to claim 1 is characterized in that: it also comprises a tri-state gate circuit; Two output ports of described control chip connect temperature sensing circuit by tri-state gate circuit; An input port of control chip connects temperature sensing circuit by tri-state gate circuit.
3. temperature-detecting device according to claim 1 is characterized in that: described temperature sensing circuit is made up of thermo-sensitive resistor, reference resistance, current-limiting resistance, electric capacity; After described thermo-sensitive resistor, reference resistance, the current-limiting resistance parallel connection and capacitance series.
4. temperature-detecting device according to claim 1 is characterized in that: the other end of described thermo-sensitive resistor, reference resistance, current-limiting resistance connects the output pin and the output pin of control chip respectively by tri-state gate circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200065961U CN201016816Y (en) | 2007-03-22 | 2007-03-22 | Temperature checkout gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200065961U CN201016816Y (en) | 2007-03-22 | 2007-03-22 | Temperature checkout gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201016816Y true CN201016816Y (en) | 2008-02-06 |
Family
ID=39057310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200065961U Expired - Fee Related CN201016816Y (en) | 2007-03-22 | 2007-03-22 | Temperature checkout gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201016816Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2562749C2 (en) * | 2014-01-09 | 2015-09-10 | Акционерное общество "Информационные спутниковые системы" имени академика М.Ф. Решетнёва" | Temperature control interface module |
| CN111489872A (en) * | 2020-03-25 | 2020-08-04 | 河海大学常州校区 | Strong PUF circuit design method based on EHD printed resistor technology |
-
2007
- 2007-03-22 CN CNU2007200065961U patent/CN201016816Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2562749C2 (en) * | 2014-01-09 | 2015-09-10 | Акционерное общество "Информационные спутниковые системы" имени академика М.Ф. Решетнёва" | Temperature control interface module |
| CN111489872A (en) * | 2020-03-25 | 2020-08-04 | 河海大学常州校区 | Strong PUF circuit design method based on EHD printed resistor technology |
| CN111489872B (en) * | 2020-03-25 | 2022-03-11 | 河海大学常州校区 | Strong PUF circuit design method based on EHD printed resistor technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080206 Termination date: 20150322 |
|
| EXPY | Termination of patent right or utility model |