CN101692605B - Circuit of pyroelectric infrared-sensing type switch - Google Patents
Circuit of pyroelectric infrared-sensing type switch Download PDFInfo
- Publication number
- CN101692605B CN101692605B CN200910070519A CN200910070519A CN101692605B CN 101692605 B CN101692605 B CN 101692605B CN 200910070519 A CN200910070519 A CN 200910070519A CN 200910070519 A CN200910070519 A CN 200910070519A CN 101692605 B CN101692605 B CN 101692605B
- Authority
- CN
- China
- Prior art keywords
- amplifier
- circuit
- transistor
- sensing type
- pyroelectric infrared
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention relates to a circuit of a pyroelectric infrared-sensing type switch, comprising a signal input stage 1, a first amplifier 2, a second amplifier 3, a reference circuit 4, a comparator 5 and a switch circuit 6. The first amplifier 2 comprising a transistor T1 sets a special limit to the circuit parameter; the reference circuit 4 is a compensating reference circuit comprising a transistor T2; and the first amplifier 2 and the reference circuit 4 can better inhibit and compensate the high-frequency and low-frequency interference signals resulted from the change of the temperature, the power and the like and make up the defects of the prior circuit. The pyroelectric infrared-sensing type switch can sense the infrared rays of 8-12 meters away when running steadily in the four seasons and can sense the infrared rays of more than 8 meters away when running in the hot summer. The pyroelectric infrared-sensing type switch can be used as the illuminating automatic switch and the safeguarding automatic switch in the corridor and the indoor and outdoor public places such as the washing room, the toilet, the store room, the garden, the lawn and the like.
Description
One, technical field
The present invention relates to a kind of inductive switch circuit, be specifically related to a kind of circuit of pyroelectric infrared-sensing type switch.
Two, background technology
The simple operation principle of circuit of pyroelectric infrared-sensing type switch is: during its pyroelectric sensor detects that mobile human body sends faint infrared ray, just produce low-frequency pulse (below the 1HZ), amplify comparator, driving switch action through two-stage.Its hommization function is popular in users, and can be used for various automatic switches such as illumination, security personnel.But what come out and use for many years is also few; Be used for corridor like " pyroelectric infrared-sensing type lighting switch "; The touch delay switch that it than what sound can both make lamp bright sound, light-operated switch and need staff to touch is much better, but usefulness can not show a candle to that more than two kinds; Be used for indoor and outdoor public area (toilet, lavatory, storeroom, garden, lawn ...) can realize " people is at the lamp light yellow; the people walks time-delay and turns off the light ", stop the wasting phenomenon of " no thin and weak man is long bright ", its energy saving space is very big; Energy-saving benefit is very high; But its and little being suitable for, application very few, but just because its induction range is little.
More than explanation; The technical indicator of existing circuit of pyroelectric infrared-sensing type switch can not satisfy the demands; Mainly be stability and sensitivity problem; Although say " its detection range can reach 10 meters " on the data that has, that is under the conditions such as laboratory particular environment, temperature, power supply in fact, particularly temperature conditions.The ultimate range responded to (sensitivity) that " pyroelectric infrared-sensing type lighting switch " product of selling on the market (being mostly special chip) is general is about 5 meters, has only 3 meters even lower summer.Thus, it can be used widely, must improve its stability and sensitivity to greatest extent.
Through study for many years, test, on probation, think that difficult point and the defective of prior art in its circuit of pyroelectric infrared-sensing type switch design narrated as follows:
1, human body infrared induction signal is very faint, and it is necessary adopting two-stage to amplify, and multiplication factor is big more, and anti-interference difficulty is big more, and sensitivity and stable contradiction are very outstanding.
2, the frequency of human body infrared induction signal is very low, and (below the 1HZ) will have enough big multiplication factor to low frequency signal like this, and is very difficult to the inhibition of low-frequency disturbance.The coupling capacitance of passing that can not have big obstruction like low-frequency interference signal; Various shunt capacitances, filter capacitor, decoupling capacitor etc., they suppress the higher-frequency interference signal is effectively, but incompetent to the inhibition of low-frequency disturbance.And the interference signal that variable effects such as temperature, power supply form is the low frequency composition in a large number.
3, pyroelectric sensor is very responsive to temperature, power supply, environmental change; The interference signal of being introduced by it when static is through the amplification of first amplifier; Influence to circuit stability is very serious, and first amplifier in the known circuit is ineffective to the inhibition of interference signal, first amplifier employing transistor amplifier circuit; When static, it has and the multiplication factor same to induced signal to interference signal; " band is logical " amplifier that employing RC and transport and placing device are formed, the low-frequency interference signal identical or close with the induced signal frequency had identical or close multiplication factor.
4, in the known circuit of pyroelectric infrared-sensing type switch, reference voltage is that the electric resistance partial pressure type circuit provides, and is fixed value, and the quiescent voltage of comparison signal changes with temperature, power supply etc. and drift up and down.The high more drift value of temperature is big more, and its reference voltage must be regulated sensitivity by most severe condition, and sensitivity just must be adjusted enough lowly.
5, temperature is high more, and interference signal is serious more; And temperature is high more, and the difference of human body temperature (constant) and ambient temperature reduces, human body infrared when mobile pyroelectricity pass the pulse amplitude that inductor produces and but reduce, multiplication factor reduces.Compensate multiplication factor with temperature-sensitive element in some data, lose more than gain in fact.
Three, summary of the invention
For remedying the defective of existing circuit of pyroelectric infrared-sensing type switch; Improve its stability and sensitivity to greatest extent, to enlarge the scope of application, popularization and application; The present invention does special qualification to the first amplifying circuit parameter of being made up of transistor; Make it interference signal, comprise that low-frequency interference signal has inhibitory action well, and weaken the influence of temperature the working point to the input stage introducing; The interference signal of compensating in the comparison signal with setoff formula reference circuit comprises low-frequency interference signal.The present invention will explain in conjunction with accompanying drawing 1, accompanying drawing 2 through embodiment.
Four, description of drawings
The structure chart of Fig. 1, the known circuit of pyroelectric infrared-sensing type switch of expression.
The structure chart of the circuit of pyroelectric infrared-sensing type switch that Fig. 2, expression are invented.
Five, embodiment
Fig. 1, known circuit comprise; Input stage (1); First amplifier (2), second amplifier (3), reference circuit (4), comparator (5), switching circuit (6), its first amplifier (2) has plenty of the transistor amplifier circuit of using, and has plenty of the bandpass amplifier of forming with RC and transport and placing device; Its reference circuit (4) is by resistance R
1, R
P, R
2The bleeder circuit of forming.
Fig. 2, the circuit of inventing comprise, input stage (1), first amplifier (2), second amplifier (3), reference circuit (4), comparator (5), switching circuit (6).Its first amplifier (2) is by transistor T
1, collector resistance C1, biasing resistor R
B1Form resistance R
B1Be connected in transistor T
1Collector electrode C
1With benchmark B
1Between, collector electrode C
1Link with the positive input terminal of second amplifier (3); Its reference circuit (4) is by transistor T
2, collector electrode R
C2, biasing resistor R
B2Form resistance R
B2Be connected in transistor T
2Collector electrode C
2With base stage B
2Between, collector electrode C
2Link with the negative input end of comparator.This reference circuit is referred to as " compensating for the formula reference circuit ".Parameter to first amplifier (2) has special qualification; Setoff formula reference circuit (4) constitutes with the circuit of first amplifier (2), component parameters has certain relation.
Its enforcement and action principle below are described
1, the special qualification and the action principle of first amplifier (2) parameter:
The parameter of first amplifier (2) limits: when normal temperature (25 ℃), and the quiescent operation voltage U
BEFor about 0.54V, the input characteristic curve I of amplifier (2) just
B(U
BE) the corner near cut-off region (0.5V below), got into before the ascent stage, its purpose is when 1. static, lets subtle disruption signal suppressing that input stage (1) gets in this zone, and very little electric current and voltage amplification factor can only be arranged.2. this working point, district of turning round be acted upon by temperature changes more than the ascent stage little many (bunch can know) by the temperature variation curve of input characteristics
When the people gets into induction zone (dynamically), the positive half cycle of inductive impulse signal is crossed the district of turning round and is got into the ascent stage, and input, output current sharply rise output voltage U
C1Sharply descend, amplify through second amplifier (3), comparative voltage descends, and is brought down below reference voltage, comparator toggles, switch motion.
More than explanation, first amplifier (2) quiescent operation voltage limits especially, and the high and low frequency interference signal of input stage is had inhibitory action; The working point is weakened by influence of temperature change.This limit value is the collector resistance R by first amplifier (2)
C1With biasing resistor R
B1Reasonable disposition realizes: collector resistance R
C1Be 50K-80K ohm, biasing resistor R
B1Be 2M-3M ohm.By quantitative change to qualitative change, if unreasonable allocation makes it the ascent stage (V that the working point gets into input characteristic curve
BE.＞0.56V), stability is just very different so, and sensitivity also just is difficult to improve.
First amplifier (2) in Fig. 1, known circuit, the employing transistor amplifier circuit, in various data, its collector resistance R
C1With biasing resistor R
B1The parameter configuration susceptible of proof, its quiescent point is ascent stage of being in input characteristic curve (V during 25 ℃ of normal temperature
BE.＞0.56V), much serious for the interference signal and the influence of temperature variation of input stage; First amplifier (2) adopts RC and transport and placing device to form bandpass amplifier, and low-frequency interference signal identical or that be comparable to the inductive impulse signal frequency is had identical or close multiplication factor, and is to the interference signal inhibition ineffective.
2, compensate for formula reference circuit (4) action principle:
In Fig. 2 institute inventive circuit, compensate for approximate first amplifier (2), the transistor T of being same as of formula reference circuit (4)
2With transistor T
1Be same lot number, biasing resistor R
B2With R
B1Identical, collector resistance R
C2Only greater than R
C1(depend on sensitivity) about 7%.Its role is to compensate for the interference signal of comparative voltage, to improve stability and sensitivity, action principle is following:
Formula reference circuit (4) is approximate to be same as first amplifier (2) owing to compensate for, and connects same power supply again, therefore receives the influence of variations in temperature and power-supply fluctuation to be close to identical; If second amplifier (3) is desirable bandpass amplifier, it does not have amplification to first amplifier (2) quiescent operation voltage but follows effect, and comparative voltage is also just followed the quiescent operation voltage of first amplifier (2); When the quiescent operation voltage of first amplifier (2) drifted about up and down with variations in temperature, power-supply fluctuation influence, comparative voltage was also being followed drift up and down, compensates for the also approximate identical ground drift up and down of formula reference voltage; So the drift value to comparing in the voltage plays the setoff effect, if can " fully " compensate for, stability and sensitivity can reach best so; But actual conditions are; Also have some other factor, cause the variation of comparative voltage, compensate for the variation that the formula reference voltage can not compensate for comparative voltage fully; So; Must suitably reduce reference voltage, sensitivity is turned down a bit, that is exactly the collector resistance R that will compensate for formula reference voltage (4)
C2Strengthen, than the collector resistance R of first amplifier (2)
C1Big about 7% get final product.
Above embodiment is very fruitful to improving stability and sensitivity.Certainly, other each links also must be reasonable in design." the pyroelectric infrared-sensing type lighting switch " of inventor's development is through on probation; Under four seasons stable operation situation; Its sensitivity is 8 meters---12 meters; Can be used in corridor and indoor and outdoor public area (toilet, lavatory, storeroom, garden etc.) also more than 8 meters extremely the hottest summer.
The present invention has disclosed the defective of available circuit, and remedies effectively, and its performance index go for various automatic switches such as illumination, security personnel fully, thereby can make it to be used widely.
Claims (1)
1. a circuit of pyroelectric infrared-sensing type switch is made up of signal input stage (1), first amplifier (2), second amplifier (3), setoff formula reference circuit (4), comparator (5), driving switch circuit (6), and first amplifier (2) is by transistor T
1, collector resistance R
C1, biasing resistor R
B1Form biasing resistor R
B1Be connected in transistor T
1Collector electrode C
1With base stage B
1Between, transistor T
1Base stage B
1Connect signal input part, collector electrode C
1Connect the positive input terminal of second amplifier (3), it is characterized in that: the configuration of the component parameters of first amplifier (2), quiescent point have special qualification: quiescent operation voltage U when 25 ℃ of normal temperature
BEFor about 0.54V, parameter configuration is: collector resistance R
C1Be 50K-80K ohm, biasing resistor R
B1Be 2M-3M ohm; Setoff formula reference circuit (4) is by transistor T
2, collector resistance R
C2, biasing resistor R
B2Form R
B2Be connected in transistor T
2Collector electrode C
2With base stage B
2Between, crystal T
2Collector electrode C
2Link transistor T with the negative input end of comparator (5)
2With transistor T
1Same lot number, biasing resistor R
B2With R
B1Identical, collector resistance R
C2Only greater than collector resistance R
C17%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910070519A CN101692605B (en) | 2009-09-22 | 2009-09-22 | Circuit of pyroelectric infrared-sensing type switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910070519A CN101692605B (en) | 2009-09-22 | 2009-09-22 | Circuit of pyroelectric infrared-sensing type switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101692605A CN101692605A (en) | 2010-04-07 |
| CN101692605B true CN101692605B (en) | 2012-09-12 |
Family
ID=42081268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910070519A Expired - Fee Related CN101692605B (en) | 2009-09-22 | 2009-09-22 | Circuit of pyroelectric infrared-sensing type switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101692605B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170724B (en) * | 2011-01-18 | 2013-07-31 | 朱虹 | Lamp controlled by pyroelectric infrared module and light |
| CN103475428A (en) * | 2012-06-07 | 2013-12-25 | 陕西汉唐惠通通讯设备有限公司 | Processing method for preventing mobile phone signal interference in infrared human body detection |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2100058U (en) * | 1991-07-06 | 1992-03-25 | 孟庆昌 | Passive heat releasing infrared ray fully-automatic electron switch |
| US5148044A (en) * | 1990-02-27 | 1992-09-15 | Yung Chaun Chen | Structure of multiplex connector |
| US5675193A (en) * | 1994-11-29 | 1997-10-07 | Larry C. Y. Lee | Manual override mechanism for automatic switching circuit |
| CN2283332Y (en) * | 1996-09-17 | 1998-06-03 | 董景金 | Self-control energy-saving switch |
| CN2314547Y (en) * | 1997-09-20 | 1999-04-14 | 张诗冠 | Self controlling lamp |
-
2009
- 2009-09-22 CN CN200910070519A patent/CN101692605B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5148044A (en) * | 1990-02-27 | 1992-09-15 | Yung Chaun Chen | Structure of multiplex connector |
| CN2100058U (en) * | 1991-07-06 | 1992-03-25 | 孟庆昌 | Passive heat releasing infrared ray fully-automatic electron switch |
| US5675193A (en) * | 1994-11-29 | 1997-10-07 | Larry C. Y. Lee | Manual override mechanism for automatic switching circuit |
| CN2283332Y (en) * | 1996-09-17 | 1998-06-03 | 董景金 | Self-control energy-saving switch |
| CN2314547Y (en) * | 1997-09-20 | 1999-04-14 | 张诗冠 | Self controlling lamp |
Non-Patent Citations (1)
| Title |
|---|
| 陈永甫.红外探测与控制电路.《红外探测与控制电路》.人民邮电出版社,2004,第307页第3段至倒数第1段以及附图6-17. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101692605A (en) | 2010-04-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101692605B (en) | Circuit of pyroelectric infrared-sensing type switch | |
| CN112291902A (en) | Microwave induction drive circuit, alarm and lamp | |
| CN107228715B (en) | Pyroelectric infrared control chip | |
| CN206235399U (en) | Body-sensing device | |
| US8552376B2 (en) | Pyroelectric motion detection circuit | |
| CN102843809B (en) | Human body movement induced dimming control device | |
| CN102413613A (en) | Electricity-saving control device method and method for human body detection based on capacitance effect | |
| CN203761629U (en) | Time-delay variable human body-induction LED drive circuit | |
| CN207947929U (en) | A kind of radar induced intelligent LED lamp circuit | |
| CN203554761U (en) | Light control circuit adopting heat radiation induction | |
| CN2718902Y (en) | Intelligent human body induction switch | |
| KR101775487B1 (en) | Circuit for preventing mal-function of sensor light | |
| CN105938018A (en) | Pyroelectric detector | |
| CN109831198A (en) | Microwave induced control device | |
| CN202979406U (en) | Double-level brightness intelligent-control LED illumination circuit | |
| CN203083713U (en) | Intelligent double-identification sensor | |
| CN209806138U (en) | multi-sensor energy-saving lighting device | |
| CN204465976U (en) | The microwave induced LED corridor lamp of photovoltaic energy storage operated type | |
| CN219269125U (en) | Human response buried lamp circuit | |
| CN212851133U (en) | Intelligent light adjusting circuit for underground garage | |
| CN105050242A (en) | Infrared automatic control circuit of LED energy-saving lamp | |
| CN201491347U (en) | Light control human body induced controller for illuminating lamp | |
| CN205385469U (en) | Microwave -induced controller circuit and microwave response lamp control circuit | |
| CN205040062U (en) | Two accuse lamps of reputation | |
| CN205484163U (en) | Smoke signal measuring circuit of prepackage type transformer substation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: CHENG AILIN Free format text: FORMER OWNER: TIANJIN POLYTECHNIC UNIVERSITY Effective date: 20120109 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 300160 HEDONG, TIANJIN TO: 300161 HEDONG, TIANJIN |
|
| TA01 | Transfer of patent application right |
Effective date of registration: 20120109 Address after: 300161 Tianjin City Hedong District of Shanghang Lu Fang Xin Yuan 12-4-101 Applicant after: Cheng Ailin Address before: 300160 Hedong Road, Hedong District, Tianjin, No. 63 Applicant before: Tianjin Polytechnic University |
|
| 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: 20120912 Termination date: 20170922 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |