CN204882653U - Electric power instrument with infrared vehicle actuated control LCD is shaded - Google Patents
Electric power instrument with infrared vehicle actuated control LCD is shaded Download PDFInfo
- Publication number
- CN204882653U CN204882653U CN201520650704.3U CN201520650704U CN204882653U CN 204882653 U CN204882653 U CN 204882653U CN 201520650704 U CN201520650704 U CN 201520650704U CN 204882653 U CN204882653 U CN 204882653U
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- CN
- China
- Prior art keywords
- infrared sensor
- signal amplification
- amplification circuit
- pyroelectric infrared
- infrared induction
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Abstract
The utility model discloses an electric power instrument with infrared vehicle actuated control LCD is shaded, including infra red ray induction unit, MCU, the infra red ray induction unit includes fresnel lens, pyroelectric infrared sensor and infra red ray induction signal amplification circuit, and fresnel lens links to each other with pyroelectric infrared sensor, and pyroelectric infrared sensor links to each other with infra red ray induction signal amplification circuit, and infra red ray induction signal amplification circuit links to each other with MCU. The utility model discloses a fresnel lens has removed light straight line propagation's in convex lens part, only remains and takes place refractive curved surface, reaches the decay that the same spotlight effect has still reduced light to adopt pyroelectric infrared sensor, improve human ultra -red collection rate, increase the instrument to ultra -red accuracy of human body and sensitivity, after infra red ray induction signal amplification circuit handled, pyroelectric infrared sensor had very high sensitivity, has solved the not high problem of sensitivity of ultra -red collection rate of present human body and instrument.
Description
Technical field
The utility model relates to a kind of electric instrument, particularly relates to a kind of electric instrument with infrared induction control LCD backlight.
Background technology
In a utility model patent of China's bulletin, the authorized announcement date of this utility model patent is 2012.05.30, notification number is CN202258259U, specifically disclose a kind of backlight driving device and liquid crystal indicator, described liquid crystal indicator comprises backlight and backlight driving device, and described backlight is connected with described backlight driving device; The backlight source driving circuit that described backlight driving device comprises infrared induction circuit and is connected with described infrared induction circuit, described infrared induction circuit is for responding to User Status, and the station status signal sensed is sent to described backlight source driving circuit, described backlight source driving circuit regulates the brightness of backlight according to described station status signal, and this utility model is applicable to liquid crystal display.But after this backlight driving device and liquid crystal indicator Long-Time Service, there will be the problem that the sensitivity of the acquisition rate of human body infrared and instrument is not high.
Utility model content
For overcoming above-mentioned shortcoming, the purpose of this utility model is to provide a kind of electric instrument with infrared induction control LCD backlight improving human body infrared acquisition rate, meter sensitivity.
In order to reach above object, the technical solution adopted in the utility model is: a kind of electric instrument with infrared induction control LCD backlight, comprise infrared induction unit, MCU, described infrared induction unit comprises Fresnel Lenses, pyroelectric infrared sensor and infrared induction signal amplification circuit, described Fresnel Lenses is connected with pyroelectric infrared sensor, described pyroelectric infrared sensor is connected with infrared induction signal amplification circuit, and described infrared induction signal amplification circuit is connected with MCU.The beneficial effects of the utility model are, one, refraction due to light only occurs in the interface of medium, the part of common convex lens light rectilinear propagation in glass can make light attenuation, and Fresnel Lenses eliminates the part of light at convex lens propagate straight, only retains the curved surface that refraction occurs, just a large amount of materials can be saved, reach the decay that identical spotlight effect also reduces light simultaneously, thus improve the collection of human body infrared, increase the sensitivity of instrument; They are two years old, adopt pyroelectric infrared sensor, pyroelectric infrared sensor itself has the radiation not sending out type any, device power consumption is very little, good concealment, cheap advantage, this sensor adopts and 2 detection units that polarity is contrary, characteristic is consistent is serially connected, eliminate the interference that environment and Self-variation cause, its principle utilizes two contrary, equal-sized undesired signals of polarity to cancel out each other in inside sensor is compensated, thus improve instrument to the accuracy of human body infrared, and sensitivity; They are three years old, generally the response signal of pyroelectric infrared sensor is fainter, the designing requirement of human body infrared inductive switch is first after preposition infrared induction signal amplification circuit process, through pyroelectric infrared sensor, pyroelectric infrared sensor is so just made to have very high sensitivity, in addition, infrared induction signal amplification circuit also possesses in total system that have can jamproof function.
Be that described electric instrument also comprises nonvolatile memory as further improvement of the utility model, described nonvolatile memory is connected with MCU.Adopt nonvolatile memory can be long-term preservation data, and there is very good stability, relative to Flash technology, phase transition storage does not need independent erase step, and read latch is greatly about about 50 to 100 nanoseconds, and write time delay is approximately several milliseconds, improve the stability of instrument and the life-span of data-carrier store, ensure the quality of product, also met the occasion of some needs high speed communications, instrument is further improved the sensitivity whether having people close and accuracy.
Preferably, described nonvolatile memory is ferroelectric memory.
Preferably, also comprise A/D sample circuit, LCD liquid crystal and power-supply system, described A/D sample circuit, LCD liquid crystal are connected with MCU respectively with power-supply system, and described A/D sample circuit is connected with power network signal.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present embodiment.
In figure:
1-MCU; 2-ferroelectric memory; 3-A/D sample circuit; 4-LCD liquid crystal; 5-power-supply system; 6-power network signal; 7-infrared induction unit; 8-Fresnel Lenses; 9-pyroelectric infrared sensor; 10-infrared induction signal amplification circuit.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail, to make advantage of the present utility model and feature can be easier to be readily appreciated by one skilled in the art, thus more explicit defining is made to protection domain of the present utility model.
Shown in accompanying drawing 1, a kind of electric instrument with infrared induction control LCD backlight in the present embodiment, comprise nonvolatile memory, A/D sample circuit 3, LCD liquid crystal 4 and power-supply system 5, infrared induction unit 7, MCU (micro-control unit) 1, in the present embodiment, nonvolatile memory adopts ferroelectric memory 2, ferroelectric memory 2, A/D sample circuit 3, LCD liquid crystal 4 is connected with MCU1 respectively with power-supply system 5, A/D sample circuit 3 is connected with power network signal 6, infrared induction unit 7 comprises Fresnel Lenses 8, pyroelectric infrared sensor 9 and infrared induction signal amplification circuit 10, Fresnel Lenses 8 is connected with pyroelectric infrared sensor 9, pyroelectric infrared sensor 9 is connected with infrared induction signal amplification circuit 10, infrared induction signal amplification circuit 10 is connected with MCU1.Wherein, refraction due to light only occurs in the interface of medium, the part of common convex lens light rectilinear propagation in glass can make light attenuation, Fresnel Lenses 8 eliminates the part of light at common convex lens propagate straight, only retain the curved surface that refraction occurs, then improve the collection of human body infrared, increase the sensitivity of instrument; Adopt pyroelectric infrared sensor 9 to adopt 2 detection units that polarity is contrary, characteristic is consistent are serially connected, eliminate the interference that environment and Self-variation cause, its principle utilizes two contrary, equal-sized undesired signals of polarity to cancel out each other in inside sensor is compensated, thus improve instrument to the accuracy of human body infrared and sensitivity; Generally the response signal of pyroelectric infrared sensor 9 is fainter, the designing requirement of human body infrared inductive switch is first after preposition infrared induction signal amplification circuit 10 processes, make pyroelectric infrared sensor 9 have very high sensitivity, simultaneously infrared induction signal amplification circuit 10 possesses in total system that have can jamproof function.
Time at the scene, as long as operating personnel near instrument within the scope of 2 ~ 3m, Fresnel Lenses 8 will detect the infrared ray that human body sends, the radiation focused on is passed on pyroelectric infrared sensor 9, export with high level signal, infrared induction signal amplification circuit 10 is the I/O mouth passing to MCU1 after the dual amplification of signal of induction, when MCU1 detects high level signal, control backlight after continuing for 5 seconds and light Circulating fibrocytes electrical parameter and electric energy simultaneously, with the data facilitating field staff to read instrument when the button of instrument need not be operated.After people leaves, backlight automatic distinguishing, Circulating fibrocytes stops.Not only facilitate the operation of field staff, LCD backlight can also be protected to increase the service life, reduce instrument power consumption.
Above embodiment is only for illustrating technical conceive of the present utility model and feature; its object is to allow person skilled in the art understand content of the present utility model and to be implemented; protection domain of the present utility model can not be limited with this; all equivalences done according to the utility model Spirit Essence change or modify, and all should be encompassed in protection domain of the present utility model.
Claims (4)
1. the electric instrument with infrared induction control LCD backlight, comprise infrared induction unit (7), MCU (1), it is characterized in that: described infrared induction unit (7) comprises Fresnel Lenses (8), pyroelectric infrared sensor (9) and infrared induction signal amplification circuit (10), described Fresnel Lenses (8) is connected with pyroelectric infrared sensor (9), described pyroelectric infrared sensor (9) is connected with infrared induction signal amplification circuit (10), described infrared induction signal amplification circuit (10) is connected with MCU (1).
2. the electric instrument with infrared induction control LCD backlight according to claim 1, is characterized in that: also comprise nonvolatile memory, and described nonvolatile memory is connected with MCU (1).
3. the electric instrument with infrared induction control LCD backlight according to claim 2, is characterized in that: described nonvolatile memory is ferroelectric memory (2).
4. according to the electric instrument with infrared induction control LCD backlight in claim 1-3 described in any one, it is characterized in that: also comprise A/D sample circuit (3), LCD liquid crystal (4) and power-supply system (5), described A/D sample circuit (3), LCD liquid crystal (4) are connected with MCU (1) respectively with power-supply system (5), and described A/D sample circuit (3) is connected with power network signal (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520650704.3U CN204882653U (en) | 2015-08-26 | 2015-08-26 | Electric power instrument with infrared vehicle actuated control LCD is shaded |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520650704.3U CN204882653U (en) | 2015-08-26 | 2015-08-26 | Electric power instrument with infrared vehicle actuated control LCD is shaded |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204882653U true CN204882653U (en) | 2015-12-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520650704.3U Expired - Fee Related CN204882653U (en) | 2015-08-26 | 2015-08-26 | Electric power instrument with infrared vehicle actuated control LCD is shaded |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204882653U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854872A (en) * | 2020-06-18 | 2020-10-30 | 浙江威星智能仪表股份有限公司 | Ultrasonic gas meter interactive operation system |
-
2015
- 2015-08-26 CN CN201520650704.3U patent/CN204882653U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854872A (en) * | 2020-06-18 | 2020-10-30 | 浙江威星智能仪表股份有限公司 | Ultrasonic gas meter interactive operation system |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20190826 |