CN201425519Y - Infrared sensing circuit - Google Patents
Infrared sensing circuit Download PDFInfo
- Publication number
- CN201425519Y CN201425519Y CN2009201462197U CN200920146219U CN201425519Y CN 201425519 Y CN201425519 Y CN 201425519Y CN 2009201462197 U CN2009201462197 U CN 2009201462197U CN 200920146219 U CN200920146219 U CN 200920146219U CN 201425519 Y CN201425519 Y CN 201425519Y
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- Prior art keywords
- operational amplifier
- infrared sensor
- infrared
- infrared sensing
- sensing circuit
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Abstract
The utility model relates to an infrared sensing circuit, which comprises an infrared sensor and an operational amplifier. An in-phase end of the operational amplifier is connected with a sensing signal output end of the infrared sensor (PIR); an out-phase end of the operational amplifier is grounded after sequentially in series connection with an electrolytic capacitor and a thermistor; an outputend of the operational amplifier is an infrared sensing signal output end; a first RC parallel circuit is arranged between the out-phase end and the output end of the operational amplifier; a filtercapacitor is disposed between a power source end and a grounding end of the infrared sensor; a second RC parallel circuit for filtering is arranged between the sensing signal output end and the grounding end of the infrared sensor; the power source end of the infrared sensor is connected to a direct current power source after being serially connected with a current limit resistor; the output end of the operational amplifier is provided with an RC series circuit. The infrared sensing circuit adopts the thermistor to automatically compensate the impact of temperature change on the sensitivity ofthe infrared sensor so as to guarantee the sensitivity of the infrared sensor to always remain consistent.
Description
Technical field
The utility model relates to a kind of infrared sensing circuit.
Background technology
Existing infrared sensing circuit often easily is acted upon by temperature changes, and promptly when the residing environment temperature of infrared sensor significantly improves or reduces, the infrared sensing signal of infrared sensor output will drift about, thereby influence infrared detection.
The utility model content
Technical problem to be solved in the utility model provide a kind of simple in structure, be suitable for the infrared sensing circuit of compensates to infrared sensor influence.
For solving the problems of the technologies described above, the utility model provides a kind of infrared sensing circuit, comprising: infrared sensor and operational amplifier; The end in the same way of operational amplifier links to each other with the transducing signal output terminal of infrared sensor (PIR), and the end of oppisite phase of operational amplifier is connected in series ground connection behind electrochemical capacitor and the thermistor successively, and the output terminal of operational amplifier is the infrared sensing signal output part.
Further, be provided with a RC parallel circuit between the end of oppisite phase of described operational amplifier and the output terminal.
Further, described infrared sensor also comprises power end and earth terminal; Be provided with filter capacitor between this power end and the earth terminal, stable to guarantee power supply.
Further, be provided with the 2nd RC parallel circuit that filtering is used between the transducing signal output and ground of described infrared sensor, to guarantee the stable of transducing signal output.
Further, connect direct supply behind the power end of the described infrared sensor serial connection current-limiting resistance, in case fluid stopping is excessive through the electric current of infrared sensor.
Further, the output terminal of described operational amplifier is provided with the RC series circuit, so that the output of infrared sensing signal.
The utlity model has positive effect: (1) infrared sensing circuit of the present utility model adopts the influence of the automatic compensates of thermistor to the sensitivity of infrared sensor in use, guarantees that the sensitivity of infrared sensor remains unanimity.
Description of drawings
The utility model is further explained below in conjunction with accompanying drawing, and wherein accompanying drawing is as follows:
Fig. 1 is the electrical schematic diagram of the infrared sensing circuit of embodiment 1.
Embodiment
(embodiment 1)
See Fig. 1, the infrared sensing circuit of present embodiment comprises: infrared sensor PIR and operational amplifier U1; Holding in the same way with the transducing signal output terminal of infrared sensor PIR of operational amplifier U1 links to each other, and the end of oppisite phase of operational amplifier U1 is connected in series ground connection behind electrochemical capacitor C12 and the thermistor Rt successively, and the output terminal of operational amplifier U1 is the infrared sensing signal output part.
Be provided with a RC parallel circuit (comprising capacitor C 11 and resistance R 8) between the end of oppisite phase of described operational amplifier U1 and the output terminal.
Described infrared sensor PIR also comprises power end and earth terminal; Be provided with filter capacitor C9 between this power end and the earth terminal.
Be provided with the 2nd RC parallel circuit (comprising capacitor C 10 and resistance R 9) that filtering is used between the transducing signal output and ground of described infrared sensor PIR, to guarantee the stable of transducing signal output.
Connect+the 3V direct supply behind the power end serial connection current-limiting resistance R6 of described infrared sensor PIR.
The output terminal of described operational amplifier U1 is provided with RC series circuit (comprising capacitor C 13 and resistance R 10).
Adopt of the influence of the automatic compensates of thermistor Rt, guarantee that the sensitivity of infrared sensor PIR remains unanimity the sensitivity of infrared sensor PIR.
Obviously, the foregoing description only is for the utility model example clearly is described, and is not to be qualification to embodiment of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all embodiments.And these belong to conspicuous variation or the change that spirit of the present utility model extended out and still are among the protection domain of the present utility model.
Claims (6)
1, a kind of infrared sensing circuit is characterized in that comprising: infrared sensor (PIR) and operational amplifier (U1);
The end in the same way of operational amplifier (U1) links to each other with the transducing signal output terminal of infrared sensor (PIR), the end of oppisite phase of operational amplifier (U1) is connected in series electrochemical capacitor (C12) and thermistor (Rt) back ground connection successively, and the output terminal of operational amplifier (U1) is the infrared sensing signal output part.
2, infrared sensing circuit according to claim 1 is characterized in that: be provided with a RC parallel circuit between the end of oppisite phase of described operational amplifier (U1) and the output terminal.
3, infrared sensing circuit according to claim 2 is characterized in that: described infrared sensor (PIR) also comprises power end and earth terminal; Be provided with filter capacitor (C9) between this power end and the earth terminal.
4, infrared sensing circuit according to claim 3 is characterized in that: be provided with the 2nd RC parallel circuit that filtering is used between the transducing signal output and ground of described infrared sensor (PIR).
5, infrared sensing circuit according to claim 4 is characterized in that: connect direct supply behind the power end serial connection current-limiting resistance of described infrared sensor (PIR).
6, infrared sensing circuit according to claim 4 is characterized in that: the output terminal of described operational amplifier (U1) is provided with the RC series circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201462197U CN201425519Y (en) | 2009-03-25 | 2009-03-25 | Infrared sensing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201462197U CN201425519Y (en) | 2009-03-25 | 2009-03-25 | Infrared sensing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201425519Y true CN201425519Y (en) | 2010-03-17 |
Family
ID=42024970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201462197U Expired - Fee Related CN201425519Y (en) | 2009-03-25 | 2009-03-25 | Infrared sensing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201425519Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112212987A (en) * | 2020-10-10 | 2021-01-12 | 江苏创芯海微科技有限公司 | Infrared sensitive unit and array temperature measuring circuit thereof |
| CN114518467A (en) * | 2020-11-19 | 2022-05-20 | 上海星钰科技有限公司 | Ambient temperature self-calibration infrared sensor |
-
2009
- 2009-03-25 CN CN2009201462197U patent/CN201425519Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112212987A (en) * | 2020-10-10 | 2021-01-12 | 江苏创芯海微科技有限公司 | Infrared sensitive unit and array temperature measuring circuit thereof |
| CN114518467A (en) * | 2020-11-19 | 2022-05-20 | 上海星钰科技有限公司 | Ambient temperature self-calibration infrared sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100317 Termination date: 20130325 |