CN106990439B - Human body in-place detector for large-area monitoring - Google Patents
Human body in-place detector for large-area monitoring Download PDFInfo
- Publication number
- CN106990439B CN106990439B CN201710340521.5A CN201710340521A CN106990439B CN 106990439 B CN106990439 B CN 106990439B CN 201710340521 A CN201710340521 A CN 201710340521A CN 106990439 B CN106990439 B CN 106990439B
- Authority
- CN
- China
- Prior art keywords
- resistor
- circuit
- capacitor
- integrated circuit
- pin
- 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.)
- Active
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims abstract description 89
- 230000006698 induction Effects 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims description 9
- 229920000742 Cotton Polymers 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 19
- 230000010355 oscillation Effects 0.000 description 10
- 238000013459 approach Methods 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a human body in-place detector for large-area monitoring, which comprises an induction electrode, an oscillating circuit, a tuning circuit, a calibration circuit, a reference circuit, a first decoupling circuit and a second decoupling circuit, wherein the power ends of the oscillating circuit, the tuning circuit and the reference circuit are electrically connected with an external power supply, the induction electrode, the oscillating circuit, the tuning circuit, the calibration circuit and the reference circuit are sequentially connected in series, the first decoupling circuit is arranged between the power end of the oscillating circuit and the power end of the tuning circuit, and the second decoupling circuit is arranged between the reference circuit and the external power supply; the human body in-place detector for large-area monitoring disclosed by the invention realizes high temperature tolerance of the sensor and accurate detection of human body approaching on one surface by matching the electrode with the oscillating circuit and matching the capacitor.
Description
Technical Field
The invention relates to the field of human body detection, in particular to a human body in-place detector for large-area monitoring.
Background
In the conventional human body detection sensor, detection of a static human body is generally detected by an oscillation circuit mainly by means of infrared, ultrasonic, or the like, an electric signal generated by the oscillation circuit is input into a detection circuit including a detection capacitance which is set so that its capacitance changes due to approach of a human body and a reference circuit equivalent to the detection circuit without any approach detection capacitance, so that the human body approach detection circuit is detected by comparing the output of the detection circuit with the output of the reference circuit. However, with such a human body detection sensor, the larger the capacitance of the detection capacitance and the larger the wiring of the continuous inspection capacitance, the larger the capacitance of the detection capacitance and the wiring changes due to temperature, so that the detection circuit cannot obtain a constant detection result due to a change in the output of the detection circuit.
In some solutions, a temperature compensation circuit is added, and a threshold value serving as a reference value is changed according to the temperature detected by the thermistor, so that the proximity capacitance of the human body is determined, but in this case, a plurality of reference circuits and temperature compensation circuits need to be provided for a plurality of detection capacitances.
The method of arranging two oscillating circuits can also be adopted, the technology of detecting the human body through the two oscillating circuits and the two electrodes can be adopted, and the influence of temperature on the circuit can be solved through the two vibrators. However, in practical application, if a person approaches to one surface to be detected, a plurality of sensors are required to be arranged on the surface, so that possible contact points on the surface are ensured, and the person can contact two electrodes of the same sensor at the same time.
Disclosure of Invention
The object of the present invention is to solve the above problems and to provide a human body in-place detector for large-area monitoring.
The invention realizes the above purpose through the following technical scheme:
The utility model provides a human detector that targets in place for large tracts of land control, includes sensing electrode, oscillating circuit, tuned circuit, calibration circuit, reference circuit, first decoupling circuit and second decoupling circuit, oscillating circuit tuned circuit with reference circuit's power end all is connected with external power supply electricity, sensing electrode oscillating circuit tuned circuit calibration circuit with reference circuit establishes ties in proper order, first decoupling circuit sets up oscillating circuit's power end with tuned circuit's power end is between, second decoupling circuit sets up reference circuit with external power supply is between.
Further, the detector further comprises a ninth capacitor, a tenth capacitor, a third resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first indicator light, a second indicator light, a first inductor and a second inductor;
the oscillating circuit comprises an NE555 integrated circuit, a first resistor, a second resistor, a first capacitor and a second capacitor;
the tuning circuit comprises a first diode, a second diode, a fifth capacitor, a sixth capacitor and a fourth resistor;
The calibration circuit includes a fifth resistor;
the reference circuit comprises an LM358 integrated circuit;
The external power supply is respectively connected with the first end of the first resistor, the fourth pin of the NE555 integrated circuit, the eighth pin of the NE555 integrated circuit, the first end of the third capacitor, the first end of the fourth capacitor, the first end of the tenth capacitor, the first end of the third resistor, the first end of the seventh resistor, the positive voltage end of the LM358 integrated circuit, the first end of the seventh capacitor, the first end of the eighth capacitor and the first end of the eleventh resistor through the first inductor;
The induction electrode is respectively and electrically connected with a first end of a first capacitor, a first end of the second resistor, a second pin of the NE555 integrated circuit and a sixth pin of the NE555 integrated circuit, the second end of the second resistor is respectively connected with the second end of the first resistor and a seventh pin of the NE555 integrated circuit, and a fifth pin of the NE555 integrated circuit is connected with the first end of the second capacitor;
The third pin of the NE555 integrated circuit is connected with the first end of the ninth capacitor, the second end of the ninth capacitor is connected with the cathode of the first diode and the anode of the second diode, the cathode of the second diode is respectively connected with the first end of the fifth capacitor, the first end of the sixth capacitor, the second end of the tenth capacitor, the first end of the fourth resistor, the second end of the third resistor, the first end of the fifth resistor, the sliding end of the fifth resistor and the cathode of the LM358 integrated circuit, the anode of the first diode is respectively connected with the second end of the fifth capacitor, the second end of the sixth capacitor and the second end of the fourth resistor and grounded, the second end of the fifth resistor is respectively connected with the anode of the LM358 integrated circuit, the first end of the eighth resistor and the first end of the ninth resistor, the second end of the ninth resistor is connected with the first end of the tenth resistor and the output end of the LM358 integrated circuit, the second end of the tenth resistor is connected with the first end of the first indicator lamp, the second end of the eleventh resistor is connected with the second indicator lamp, the first end of the second inductor is connected with the reference ground of the detector, the second end of the first capacitor, the second end of the second capacitor, the first pin of the NE555 integrated circuit, the second end of the sixth resistor, the second end of the eighth resistor, the negative voltage end of the LM358 integrated circuit, the second end of the first indicator lamp, the second end of the second indicator lamp, the second end of the third capacitor, the second end of the fourth capacitor, the second end of the seventh capacitor, the third end of the fourth capacitor, the fourth end of the fourth capacitor, the second end of the eighth capacitor and the second end of the second inductor are grounded.
Preferably, the induction electrode is a metal mesh, the metal mesh is fixed on a mesh base or between two mesh bases, and the size of the metal mesh is smaller than that of the mesh bases.
The invention has the beneficial effects that:
The human body in-place detector for large-area monitoring disclosed by the invention realizes high temperature tolerance of the sensor and accurate detection of human body approaching on one surface by matching the electrode with the oscillating circuit and matching the capacitor.
Drawings
Fig. 1 is a circuit diagram of a human in-place detector for large area monitoring according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
As shown in fig. 1, the human body in-place detector for large-area monitoring of the invention comprises an induction electrode CN1, an oscillating circuit 2, a tuning circuit 4, a calibration circuit 5, a reference circuit 7, a first decoupling circuit 3, a second decoupling circuit 6 and a plurality of internal connection components, wherein the power ends of the oscillating circuit 2, the tuning circuit 4 and the reference circuit 7 are electrically connected with an external power supply, the induction electrode CN1, the oscillating circuit 2, the tuning circuit 4, the calibration circuit 5 and the reference circuit 7 are sequentially connected in series, the first decoupling circuit 3 is arranged between the power end of the oscillating circuit 2 and the power end of the tuning circuit 4, and the second decoupling circuit 6 is arranged between the reference circuit 7 and the external power supply.
The oscillating circuit 2 comprises an NE555 integrated circuit IC1, a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2; the tuning circuit 4 comprises a first diode D1, a second diode D2, a fifth capacitor C5, a sixth capacitor C6 and a fourth resistor R4; the calibration circuit 5 includes a fifth resistor R5; the reference circuit 7 includes an LM358 integrated circuit IC2; the internal connection components comprise a ninth capacitor C9, a tenth capacitor C10, a third resistor R3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first indicator light LED1, a second indicator light LED2, a first inductor L1 and a second inductor L2;
The external power supply is respectively connected with a first end of a first resistor R1, a fourth pin of the NE555 integrated circuit IC1, an eighth pin of the NE555 integrated circuit IC1, a first end of a third capacitor C3, a first end of a fourth capacitor C4, a first end of a tenth capacitor C10, a first end of a third resistor R3, a first end of a seventh resistor R7, a positive voltage end of the LM358 integrated circuit IC2, a first end of a seventh capacitor C7, a first end of an eighth capacitor C8 and a first end of an eleventh resistor R11 through a first inductor L1; the induction electrode CN1 is respectively and electrically connected with the first end of the first capacitor C1, the first end of the second resistor R2, the second pin of the NE555 integrated circuit IC1 and the sixth pin of the NE555 integrated circuit IC1, the second end of the second resistor R2 is respectively connected with the second end of the first resistor R1 and the seventh pin of the NE555 integrated circuit IC1, and the fifth pin of the NE555 integrated circuit IC1 is connected with the first end of the second capacitor C2; the third pin of the NE555 integrated circuit IC1 is connected with the first end of the ninth capacitor C9, the second end of the ninth capacitor C9 is connected with the cathode of the first diode D1 and the anode of the second diode D2, the cathode of the second diode D2 is connected with the first end of the fifth capacitor C5, the first end of the sixth capacitor C6, the second end of the tenth capacitor C10, the first end of the fourth resistor R4, the second end of the third resistor R3, the first end of the fifth resistor R5, the sliding end of the fifth resistor R5 and the cathode of the LM358 integrated circuit IC2, the anode of the first diode D1 is connected with the second end of the fifth capacitor C5, the second end of the sixth capacitor C6, the second end of the fourth resistor R4 and the ground, the second end of the seventh resistor R7 is connected with the anode of the LM358 integrated circuit IC2, the second end of the eighth resistor R8 and the second end of the eighth resistor R9, the second end of the second resistor R2 is connected with the second end of the LM358 integrated circuit IC2, the second end of the second resistor C2, the second end of the fourth resistor R2 is connected with the second end of the eighth resistor R6, the second end of the seventh resistor R7 is connected with the second end of the eighth resistor C2, the second end of the eighth resistor R2 is connected with the second end of the eighth resistor C2, the fourth resistor R2 is connected with the second end of the third end of the eighth resistor C6, the third end of the eighth resistor R10 is connected with the third end of the eighth resistor, the third end is connected with the third end, the third end of the third resistor, and the third end is connected with the third end, the third end of the third end is 8, and the third end is 8, and the second end is.
The invention relates to a human body in-place detector for large-area monitoring, which has the following working principle:
The induction electrode CN1 (the part denoted by reference numeral 1 in the drawing) is connected to the oscillating circuit 2 so that the circuit state changes when the human body approaches;
and a tuning circuit 4 for converting the waveform frequency variation generated by the oscillation circuit 2 into a voltage variation output, wherein the tuning circuit 4 adopts a voltage doubler rectifying circuit.
A reference circuit 7 for comparing with the output voltage of the tuning circuit 4.
And the calibration circuit 5 is used for calibrating the voltage of the reference circuit 7 and controlling the sensitivity of the sensor.
NE555 integrated circuit IC1 constitutes an oscillating circuit 2, the oscillating frequency of which is determined by the electric signals introduced by the first capacitor C1, the first resistor R1, the second resistor R2 and the sensing electrode CN 1. When the human body is not close to the induction electrode CN1, the oscillation frequency generated by the oscillation circuit 2 is very high; when a human body approaches the sensing electrode CN1, the oscillation frequency is reduced and relatively stable because capacitance, resistance and inductance generated by the approach of the human body act on the NE555 integrated circuit IC1, the oscillation waveform is output through a3 pin of the NE555 integrated circuit IC1 and is coupled to a post-stage circuit through a ninth capacitor C9, the oscillation frequency is changed into pulsating direct current through a voltage doubling rectifying circuit formed by a first diode D1 and a second diode D2, voltage signals are accumulated on a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6 after being filtered by a fifth capacitor C5 and a sixth capacitor C6 and act on a negative stage of an LM358 integrated circuit IC2 (which is essentially a common single-power double-operational amplifier IC), the voltage comparator formed by an operational amplifier is used by the circuit, the voltage of the negative stage is compared with that of the positive stage, the voltage of the negative stage is higher than that of the positive stage, and the output of a low level is output at an OUT end (namely an output end of the LM 358); the negative level is lower than the positive level, and the OUT outputs a high level.
The third capacitor C3, the fourth capacitor C4, the seventh capacitor C7 and the eighth capacitor C8 are decoupling capacitors of the power supply, and serve to reduce mutual association of circuits and stabilize electric signals. After the power is turned on, the circuit starts to work, and the tenth capacitor C10 has the function of raising the negative voltage of the LM358 integrated circuit IC2 for a short time when the circuit is not stable, so that the transient high level can not be outputted by misoperation during starting. After the circuit is electrified and stable, before a person does not arrive at a place, the fifth resistor R5 is regulated to enable the negative level potential of the LM358 integrated circuit IC2 to be slightly higher than the positive level, and the OUT output is low level (at the moment, the sensitivity of the sensor is highest); after a person is in place, the capacitance, the resistance and the inductance of the human body are greatly overlapped on the induction electrode CN1, so that the oscillation capacitance of the NE555 integrated circuit IC1 is greatly increased, the oscillation frequency of the NE555 integrated circuit IC1 is greatly reduced, the accumulated level value of the negative-stage front circuit of the LM358 integrated circuit IC2 is reduced due to the capacitive reactance effect of the ninth capacitor C9, and when the level voltage is lower than the voltage of the positive stage, the output OUT of the LM358 integrated circuit IC2 is changed from low to high, so that the in-place detection of the human body is completed.
C9 is a feedback resistor whose action causes LM358 IC2 to act as a schmitt trigger, making the circuit not too sensitive but relatively stable.
The induction electrode CN1 adopts a metal net, is fixed on the net base, the area of the metal net can be adjusted according to the needs, the net base can adopt materials such as cotton cloth, and the metal net can be arranged between two layers of net bases.
The technical scheme of the invention is not limited to the specific embodiment, and all technical modifications made according to the technical scheme of the invention fall within the protection scope of the invention.
Claims (1)
1. A human body in-place detector for large-area monitoring, characterized in that: the device comprises an induction electrode, an oscillating circuit, a tuning circuit, a calibration circuit, a reference circuit, a first decoupling circuit and a second decoupling circuit, wherein the power ends of the oscillating circuit, the tuning circuit and the reference circuit are electrically connected with an external power supply, the induction electrode, the oscillating circuit, the tuning circuit, the calibration circuit and the reference circuit are sequentially connected in series, the first decoupling circuit is arranged between the power end of the oscillating circuit and the power end of the tuning circuit, and the second decoupling circuit is arranged between the reference circuit and the external power supply;
the tuning circuit adopts a voltage doubling rectifying circuit;
the detector further comprises a ninth capacitor, a tenth capacitor, a third resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a first indicator light, a second indicator light, a first inductor and a second inductor;
the oscillating circuit comprises an NE555 integrated circuit, a first resistor, a second resistor, a first capacitor and a second capacitor;
the tuning circuit comprises a first diode, a second diode, a fifth capacitor, a sixth capacitor and a fourth resistor;
The calibration circuit includes a fifth resistor;
the reference circuit comprises an LM358 integrated circuit;
The external power supply is respectively connected with the first end of the first resistor, the fourth pin of the NE555 integrated circuit, the eighth pin of the NE555 integrated circuit, the first end of the third capacitor, the first end of the fourth capacitor, the first end of the tenth capacitor, the first end of the third resistor, the first end of the seventh resistor, the positive voltage end of the LM358 integrated circuit, the first end of the seventh capacitor, the first end of the eighth capacitor and the first end of the eleventh resistor through the first inductor;
The induction electrode is respectively and electrically connected with a first end of a first capacitor, a first end of the second resistor, a second pin of the NE555 integrated circuit and a sixth pin of the NE555 integrated circuit, the second end of the second resistor is respectively connected with the second end of the first resistor and a seventh pin of the NE555 integrated circuit, and a fifth pin of the NE555 integrated circuit is connected with the first end of the second capacitor;
The third pin of the NE555 integrated circuit is connected with the first end of the ninth capacitor, the second end of the ninth capacitor is connected with the cathode of the first diode and the anode of the second diode, the cathode of the second diode is respectively connected with the first end of the fifth capacitor, the first end of the sixth capacitor, the second end of the tenth capacitor, the first end of the fourth resistor, the second end of the third resistor, the first end of the fifth resistor, the sliding end of the fifth resistor and the cathode of the LM358 integrated circuit, the anode of the first diode is respectively connected with the second end of the fifth capacitor, the second end of the sixth capacitor and the second end of the fourth resistor and grounded, the second end of the fifth resistor is respectively connected with the anode of the LM358 integrated circuit, the first end of the eighth resistor and the first end of the ninth resistor, the second end of the ninth resistor is connected with the first end of the tenth resistor and the output end of the LM358 integrated circuit, the second end of the tenth resistor is connected with the first end of the first indicator lamp, the second end of the eleventh resistor is connected with the second indicator lamp, the first end of the second inductor is connected with the reference ground of the detector, the second end of the first capacitor, the second end of the second capacitor, the first pin of the NE555 integrated circuit, the second end of the sixth resistor, the second end of the eighth resistor, the negative voltage end of the LM358 integrated circuit, the second end of the first indicator lamp, the second end of the second indicator lamp, the second end of the third capacitor, the second end of the fourth capacitor, the second end of the seventh capacitor, the third end of the fourth capacitor, the fourth end of the fourth capacitor, the second end of the eighth capacitor and the second end of the second inductor are grounded;
The induction electrode is a metal net, the metal net is fixed on the net base or between two net bases, the size of the metal net is smaller than that of the net base, and the net base is made of cotton cloth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710340521.5A CN106990439B (en) | 2017-05-15 | 2017-05-15 | Human body in-place detector for large-area monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710340521.5A CN106990439B (en) | 2017-05-15 | 2017-05-15 | Human body in-place detector for large-area monitoring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106990439A CN106990439A (en) | 2017-07-28 |
| CN106990439B true CN106990439B (en) | 2024-05-24 |
Family
ID=59419473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710340521.5A Active CN106990439B (en) | 2017-05-15 | 2017-05-15 | Human body in-place detector for large-area monitoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106990439B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2061309U (en) * | 1989-12-19 | 1990-08-29 | 张蜀秦 | Electronic alarm for vehicle anti-climbing and goods theft-proof |
| JPH0765261A (en) * | 1993-08-26 | 1995-03-10 | Matsushita Electric Works Ltd | Human body detecting device |
| CN2256195Y (en) * | 1996-02-05 | 1997-06-11 | 张元庆 | Human body inducting electronic ignition controller |
| JP2001203565A (en) * | 2000-01-21 | 2001-07-27 | Honda Denshi Giken:Kk | Proximity sensor |
| JP2002177168A (en) * | 2000-12-12 | 2002-06-25 | Inax Corp | Seat-taking detector |
| CN2775938Y (en) * | 2005-04-20 | 2006-04-26 | 谢勇 | Inductive switch |
| CN101078774A (en) * | 2006-05-26 | 2007-11-28 | 株式会社藤仓 | Proximity sensor and proximity sensing method |
| CN101938270A (en) * | 2010-08-26 | 2011-01-05 | 刘家发 | Capacitance induction type approaching control device |
| CN103019432A (en) * | 2011-09-22 | 2013-04-03 | 黄立新 | Charged body sensing system |
| CN104614402A (en) * | 2013-11-05 | 2015-05-13 | 成都斯菲科思信息技术有限公司 | Detection circuit for detecting methane gas concentration |
| CN104634927A (en) * | 2013-11-11 | 2015-05-20 | 成都摩宝网络科技有限公司 | Air humidity monitoring and alarming simple circuit for aircraft cabin |
| CN206051594U (en) * | 2016-09-18 | 2017-03-29 | 柯淇环境技术(宁波)有限公司 | Water purification machine with human body sensing media presentation device |
| CN206804884U (en) * | 2017-05-15 | 2017-12-26 | 成都元象科技有限公司 | A kind of human body for large area monitoring is to bit detector |
-
2017
- 2017-05-15 CN CN201710340521.5A patent/CN106990439B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2061309U (en) * | 1989-12-19 | 1990-08-29 | 张蜀秦 | Electronic alarm for vehicle anti-climbing and goods theft-proof |
| JPH0765261A (en) * | 1993-08-26 | 1995-03-10 | Matsushita Electric Works Ltd | Human body detecting device |
| CN2256195Y (en) * | 1996-02-05 | 1997-06-11 | 张元庆 | Human body inducting electronic ignition controller |
| JP2001203565A (en) * | 2000-01-21 | 2001-07-27 | Honda Denshi Giken:Kk | Proximity sensor |
| JP2002177168A (en) * | 2000-12-12 | 2002-06-25 | Inax Corp | Seat-taking detector |
| CN2775938Y (en) * | 2005-04-20 | 2006-04-26 | 谢勇 | Inductive switch |
| CN101078774A (en) * | 2006-05-26 | 2007-11-28 | 株式会社藤仓 | Proximity sensor and proximity sensing method |
| CN101938270A (en) * | 2010-08-26 | 2011-01-05 | 刘家发 | Capacitance induction type approaching control device |
| CN103019432A (en) * | 2011-09-22 | 2013-04-03 | 黄立新 | Charged body sensing system |
| CN104614402A (en) * | 2013-11-05 | 2015-05-13 | 成都斯菲科思信息技术有限公司 | Detection circuit for detecting methane gas concentration |
| CN104634927A (en) * | 2013-11-11 | 2015-05-20 | 成都摩宝网络科技有限公司 | Air humidity monitoring and alarming simple circuit for aircraft cabin |
| CN206051594U (en) * | 2016-09-18 | 2017-03-29 | 柯淇环境技术(宁波)有限公司 | Water purification machine with human body sensing media presentation device |
| CN206804884U (en) * | 2017-05-15 | 2017-12-26 | 成都元象科技有限公司 | A kind of human body for large area monitoring is to bit detector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106990439A (en) | 2017-07-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6307756B2 (en) | Foreign object detection device, power transmission device, power reception device, and wireless power transmission system | |
| CN103902971A (en) | Fingerprint detection circuit and fingerprint detection device | |
| CN108287638B (en) | Touch detection circuit and touch detection method thereof | |
| WO2023197956A1 (en) | Substance parameter detection method and circuit | |
| CN102185604A (en) | Differential detection circuit for capacitive touch | |
| CN106990439B (en) | Human body in-place detector for large-area monitoring | |
| CN208588774U (en) | Voltage detecting circuit based on capacitor charge and discharge and electric resistance partial pressure | |
| US20130057302A1 (en) | Capacitive measuring circuit insensitive to high-frequency interference | |
| CN206804884U (en) | A kind of human body for large area monitoring is to bit detector | |
| CN109620990A (en) | A kind of ultrasonic wave fumigation device of constant spray amount | |
| CN207704007U (en) | A kind of DC power supply power-fail detection circuit | |
| DE60016040D1 (en) | POSITION DETECTOR DEVICE WITH VARIABLE REACTANCE | |
| CN204072071U (en) | A kind of health control Intelligent bracelet | |
| CN215186693U (en) | Non-contact induction type proximity switch | |
| CN108872693A (en) | A kind of voltage detecting circuit based on capacitor charge and discharge and electric resistance partial pressure | |
| CN209014063U (en) | A kind of essential safety turbine signal deteching circuit | |
| CN207473813U (en) | A kind of electrostatic detection sound light alarming circuit | |
| CN208999970U (en) | A kind of displacement sensor, detection device and the electronic equipment with it | |
| CN208006203U (en) | A kind of machine Control system cabinet with humidity alarm function | |
| CN102150949B (en) | Empty-head notch detector circuit | |
| CN207965853U (en) | Touch detection circuit | |
| CN109444526A (en) | A kind of device for the alternating voltage that measurement frequency is variable | |
| CN212677073U (en) | Semiconductor bias circuit and semiconductor monitor | |
| CN215768368U (en) | Capacitive condensation collection sensor | |
| CN108563358A (en) | Touch detecting method and its touch detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |