CN101900837B - Pyroelectric type infrared detector and control method thereof - Google Patents
Pyroelectric type infrared detector and control method thereof Download PDFInfo
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- CN101900837B CN101900837B CN200910142312A CN200910142312A CN101900837B CN 101900837 B CN101900837 B CN 101900837B CN 200910142312 A CN200910142312 A CN 200910142312A CN 200910142312 A CN200910142312 A CN 200910142312A CN 101900837 B CN101900837 B CN 101900837B
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Abstract
The invention provides a pyroelectric type infrared detector and a control method thereof. The pyroelectric type infrared detector is controlled by the battery power and comprises a control IC (Integrated Circuit), a photosensitive CDS (Controlled Delivery System) detection circuit, a low-voltage detection circuit and a buzzer, wherein the control IC closes an analogue amplifier of the pyroelectric type infrared detector to save the battery power when the photosensitive CDS detection circuit detects that the pyroelectric type infrared detector is at an daytime environment; the control IC starts the analogue amplifier when the photosensitive CDS detection circuit detects that the pyroelectric type infrared detector is not at the daytime environment; and the control IC starts the buzzer to notify a user when the low-voltage detection circuit detects that the batter power is excessively low.
Description
Technical field
The present invention relates to a kind of pyroelectric type infrared detector, relate in particular to the control circuit of pyroelectric type infrared detector.
Background technology
Because it is environmental consciousness strengthens at present, also strong day by day for the demand of stressing energy-conservation sensing apparatus.Modal on the market at present lamp be derived from dynamic control device be with such as pyroelectric type infrared detector (Pyroelectric Infrared Sensor, PIR) in the majority; This device generally is applicable to house, office, public place etc., and pyroelectric type infrared detector itself is to be used for detecting human body infrared, and then triggers light fixture or security system.
In general, the position that pyroelectric type infrared detector set up is in eminence usually or does not have the commercial power supply place, and the employed power supply of detector often is a battery, so the power consumption property of detector itself is just important relatively.The required average power consumption of control IC of pyroelectric type infrared detector is generally 100uA～500uA and does not wait, if be that 1A/h calculates with average every power consumption of battery, is can use about 1 year time under the holding state of 100uA at average power consumption.Can find out thus,, then will can be the user and bring more permanent service time if can reduce the average power consumption of control IC.
On the other hand; The control IC of pyroelectric type infrared detector itself is if need carry out multiple detecting function (such as: luminance detection or low-voltage detecting), and then the quantity of the required package pin positions of the control IC of present existing pyroelectric type infrared detector will become quite a lot of.Therefore, it is at IC design and the cost that encapsulates also raising thereupon, the relative design area that also will improve circuit.
As shown in Figure 1, it is a kind of circuit block diagram of existing pyroelectric type infrared detector.As shown in Figure 1, pyroelectric type infrared detector 1 mainly is by control integrated circuit (IC) 10, photosensitive (CDS) circuit for detecting 11, low-voltage circuit for detecting 12 and 13 formations of hummer.Pyroelectric type infrared detector 1 is to utilize 11 pairs of environment of CDS circuit for detecting to detect, and around differentiating, is daytime or evening now; When detecting when being daytime now, control IC10 can close digital circuit framework in the pyroelectric type infrared detector 1 automatically in the hope of power saving, but analogue amplifier wherein and window type comparer (not shown) can't be closed.Pyroelectric type infrared detector is keeping analogue amplifier and window type comparer under the state of opening if this is, but whether correct or effective if detect when being evening now just immediate response if going out signal.On the contrary, if analogue amplifier and window type comparer are closed, just then pyroelectric type infrared detector needs the long period could analogue amplifier be reset.
On the other hand, can find out also that existing pyroelectric type infrared detector is being used for the low-voltage circuit for detecting 12 of electric power detecting, mostly adopt the method for electric resistance partial pressure to come battery electric power Vcc is detected by Fig. 1; Yet though comparison power saving when resistive impedance is big, signal is interfered easily, causes low-voltage circuit for detecting 12 to be easy to by error starting.
Summary of the invention
Therefore; Be necessary to propose a kind of pyroelectric type infrared detector; Preferably only need to use three pins of control IC can accomplish functions (four pins of conventional practice general minimum needs as shown in Figure 1) such as CDS detecting, low-voltage detecting and buzzer call, and hope to expend than conventional practice electric power still less.
According to above-mentioned conception; One aspect of the present invention proposes a kind of pyroelectric type infrared detector, is controlled by a battery electric power, comprising: a control integrated circuit (IC); Inside has at least one analogue amplifier, and this control integrated circuit has one first end, one second end and one the 3rd end; One photosensitive (CDS) circuit for detecting; Constitute by at least one photoresistance and resistance institute that is one another in series; One end of this photosensitive circuit for detecting is controlled by this battery electric power; Whether the other end is electrically connected on this first end of this control integrated circuit, be daytime in order to detect the residing environment of this pyroelectric type infrared detector; One low-voltage circuit for detecting; By at least 2 resistance be one another in series the institute constitute; One end of this low-voltage circuit for detecting is controlled by this battery electric power, and whether the other end is electrically connected on that end that this photosensitive circuit for detecting and this control integrated circuit are electrically connected mutually, low excessively in order to detect this battery electric power; An and hummer; One end is electrically connected on this second end of this control integrated circuit via the series connection dividing potential drop node of one in this photosensitive circuit for detecting, the other end is electrically connected on the 3rd end of this control integrated circuit via the series connection dividing potential drop node of one in this low-voltage circuit for detecting; Wherein, When this photosensitive circuit for detecting detects the residing environment of this pyroelectric type infrared detector when being daytime; This control integrated circuit is closed this analogue amplifier saving this battery electric power, and when this photosensitive circuit for detecting detects the residing environment of this pyroelectric type infrared detector when being not daytime, this control integrated circuit is opened this analogue amplifier; And cross when low when this low-voltage circuit for detecting detects this battery electric power, this control integrated circuit is opened this hummer to notify the user.
According to above-mentioned conception; The present invention proposes a kind of control method of pyroelectric type infrared detector on the other hand; This pyroelectric type infrared detector comprises a battery, photosensitive (CDS) circuit for detecting and a low-voltage circuit for detecting at least; This control method comprises that step is following: when this photosensitive circuit for detecting detects the residing environment of this pyroelectric type infrared detector when being daytime, save the electric power that this pyroelectric type infrared detector is controlled by this battery; The electric power that detects this battery when this low-voltage circuit for detecting is crossed when low, notifies the user of this pyroelectric type infrared detector; And detect maybe when this low-voltage circuit for detecting is detected when this photosensitive circuit for detecting, stop this pyroelectric type infrared detector and carry out ultrared sensing.The present invention will combine drawings as hereinafter to explain in more detail:
Description of drawings
Fig. 1 is a kind of circuit block diagram of existing pyroelectric type infrared detector;
Fig. 2 is the circuit block diagram of a preferred embodiment of pyroelectric type infrared detector proposed by the invention;
Fig. 3 is the circuit block diagram of a kind of embodiment that is applied to the control IC of pyroelectric type infrared detector of the present invention;
Fig. 4 is the process flow diagram of a preferred embodiment of the control method of pyroelectric type infrared detector proposed by the invention.
Embodiment
See also Fig. 2, it is the circuit block diagram of pyroelectric type infrared detector one preferred embodiment proposed by the invention.In Fig. 2; Pyroelectric type infrared detector 2 is to be controlled by a battery electric power Vcc, and pyroelectric type infrared detector 2 mainly is by a control integrated circuit (IC) 20, photosensitive (CDS) circuit for detecting 21, a low-voltage (LVD) circuit for detecting 22 and 23 formations of a hummer.
The inside of control integrated circuit (IC) 20 has at least one analogue amplifier (not shown), and control integrated circuit 20 has one first end T1, one second end T2 and one the 3rd end T3.Below narrate the method for attachment of three end points respectively.
Photosensitive (CDS) circuit for detecting 21 is to be made up of at least one photoresistance and resistance institute that is one another in series; One end of photosensitive circuit for detecting 21 is controlled by battery electric power Vcc; Whether the other end is electrically connected on this first end T1 of control integrated circuit 20, be daytime in order to detecting pyroelectric type infrared detector 2 residing environment.
Low-voltage circuit for detecting 22 be by at least two resistance be one another in series the institute constitute; One end of low-voltage circuit for detecting 22 is controlled by battery electric power Vcc; The other end is electrically connected on photosensitive circuit for detecting 21 and control integrated circuit 20 mutual those ends that are electrically connected, and whether Vcc is low excessively in order to the detecting battery electric power.
One end of hummer 23 is electrically connected on this second end CDS/BUZB of control integrated circuit 20 via the series connection dividing potential drop node of one in the photosensitive circuit for detecting 21, the other end is electrically connected on the 3rd end LVD/BUZ of this control integrated circuit via the series connection dividing potential drop node of one in this low-voltage circuit for detecting.
The implementation of pyroelectric type infrared detector 2 does; When photosensitive circuit for detecting 21 detects pyroelectric type infrared detector 2 residing environment when being daytime; Control integrated circuit 20 is closed this analogue amplifier to save battery electric power Vcc; When this photosensitive circuit for detecting detects the residing environment of this pyroelectric type infrared detector when being not daytime, this control integrated circuit is opened this analogue amplifier.And cross when low when this low-voltage circuit for detecting detects this battery electric power, this control integrated circuit is opened this hummer to notify the user.
Certainly, hummer 23 can also extraly be electrically connected on light emitting diode (LED), notifies the user to cooperate hummer 23.
The present invention only utilizes three termination pin just can carry out low-voltage (LVD) detecting and CDS detecting in control IC, and has comprised the warning function of hummer, and in the detecting of this three end, adopts the timesharing detecting; That is, the LVD detecting of the CDS of second end T2 detecting and the 3rd end T3 is to take timesharing to judge with infrared ray (PIR) detecting of the first end T1.That is to say, when the LVD of the CDS detecting of carrying out the second end T2 and the 3rd end T3 detects, then stop the PIR detecting of the first end T1; And when carrying out the PIR detecting of the first end T1, then stop the CDS detecting of the second end T2 and the LVD detecting of the 3rd end T3.
Therefore, not only can significantly reduce power consumption and take into account signal stabilization, the system that also can reach still takes into account the advantage of power saving and usefulness under environmental change.In addition, the present invention can also carry out the low-voltage detecting in a set time, make that power consumption only is 1/50 of traditional low-voltage method for detecting; And in the time will driving hummer, because of can not influencing outside CDS and LVD resistance circuit, so can reflect warning really and be not affected.
See also Fig. 3, it is the circuit block diagram of a kind of embodiment that is applied to the control IC of pyroelectric type infrared detector of the present invention.In Fig. 3, two groups of analogue amplifiers that control IC30 has also comprised a ultrared sensing circuit 40 and respectively has been made up of an amplifier 38 or 39, resistance R 1 and R2, capacitor C 1 and C2, common start is with detecting user's appearance.In this figure, control IC30 utilizes three termination pin 31,32 and 34 to carry out functions such as CDS detecting, low-voltage detecting and buzzer call.
When control IC30 carries out CDS detecting and low-voltage detecting, can the current potential of first end 34 be dragged down, make low-voltage sense terminal LVD/BUZ and CDS sense terminal CDS/BUZB record the voltage quasi position behind the present divider resistance.Specifically, set accurate position VL if the CDS/BUZ current potential is lower than, then pyroelectric type infrared detector can learn that external environment condition is daytime, and control IC30 and can close analogue amplifier 38 and 39 this moment, lets pyroelectric type infrared detector have lower power consumption; On the other hand; If being lower than, the current potential of low-voltage sense terminal LVD/BUZ sets accurate position VH; Then pyroelectric type infrared detector will predict low-voltage, and control IC and can inform that to utilize the hummer (not shown) user should change battery through buzzer driver 33 this moment.
About timesharing detecting mechanism noted earlier, in the control IC30 of Fig. 3, be CDS detecting and the LVD detecting of the 3rd end and the timesharing detecting between the ultrared sensing circuit 40 of reaching second end by signal processor 37 CS S1～S4.Specifically, when the LVD detecting of the CDS detecting of desiring to carry out second end 31 and the 3rd end 32, signal processor 37 switches to switch S 3 and making win end 34 and comparer 35, disconnection between 36 with S4, and the PIR that can stop first end 34 detects; And when desiring to carry out the PIR detecting of ultrared sensing circuit 40; Signal processor 37 with switch S 3 and S4 switch to make break off between second end 31 and the comparer 35 and the 3rd end 32 and comparer 36 between break off, and can stop the CDS detecting of the second end T2 and the LVD of the 3rd end T3 detects.
See also Fig. 4, it is the process flow diagram of control method one preferred embodiment of pyroelectric type infrared detector proposed by the invention.As shown in Figure 4, behind power initiation, system gets into burnt electric type infrared ray (PIR) warm boot fast immediately, to carry out ultrared sensing.And when stopping aforesaid ultrared sensing, the detecting of being carried out this moment mainly is divided into photosensitive (CDS) detecting and two kinds of low-voltage (LVD) detectings.
When carrying out photosensitive detecting, when photosensitive circuit for detecting detects environment of living in when being daytime, control IC closes low-frequency amplifier immediately; On the contrary, when photosensitive circuit for detecting detects environment of living in when being not daytime, control IC opens low-frequency amplifier immediately and carries out the CDS detecting to confirm that environment of living in is daytime or evening; When environment of living in is daytime, then close low-frequency amplifier, when environment of living in is evening, open low-frequency amplifier.
On the other hand, carrying out low-voltage when detecting,, controlling IC this moment and start low-voltage and supply with, and starting hummer (or light emitting diode) and change battery to notify the user when detecting battery electric power when being lower than standard.
In sum, the present invention mainly proposes a kind of pyroelectric type infrared detector, only needs to use three pins of control IC can accomplish functions such as CDS detecting, low-voltage detecting and buzzer call, can expend than conventional practice electric power still less.
Though the foregoing description has been described embodiment of the present invention, the technician who is familiar with in this area can make various distortion or modification in the scope of affiliated claim.Scope of patent protection of the present invention still must be defined with the appending claims scope and is as the criterion.
Claims (3)
1. a pyroelectric type infrared detector is controlled by a battery electric power, comprising:
One control integrated circuit, inside have at least one analogue amplifier, and this control integrated circuit has one first end, one second end and one the 3rd end, and control integrated circuit also comprises a ultrared sensing circuit, in order to the detecting user;
One photosensitive circuit for detecting; By at least one photoresistance; And other resistance be one another in series constitute; Whether one end of this photosensitive circuit for detecting is controlled by this battery electric power, and the other end is electrically connected on this first end of this control integrated circuit, be daytime in order to detect the residing environment of this pyroelectric type infrared detector;
One low-voltage circuit for detecting; By at least two resistance be one another in series the institute constitute; One end of this low-voltage circuit for detecting is controlled by this battery electric power, and whether the other end is electrically connected on that end that this photosensitive circuit for detecting and this control integrated circuit are electrically connected mutually, low excessively in order to detect this battery electric power; And
One hummer; One end is electrically connected on this second end of this control integrated circuit via the series connection dividing potential drop node of one in this photosensitive circuit for detecting, the other end is electrically connected on the 3rd end of this control integrated circuit via the series connection dividing potential drop node of one in this low-voltage circuit for detecting;
Wherein, When this photosensitive circuit for detecting detects the residing environment of this pyroelectric type infrared detector when being daytime; This control integrated circuit is closed this analogue amplifier saving this battery electric power, and when this photosensitive circuit for detecting detects the residing environment of this pyroelectric type infrared detector when being not daytime, this control integrated circuit is opened this analogue amplifier; And cross when low when this low-voltage circuit for detecting detects this battery electric power, this control integrated circuit is opened this hummer to notify the user.
2. pyroelectric type infrared detector as claimed in claim 1 is characterized in that:
Detect maybe when this low-voltage circuit for detecting is detected when this photosensitive circuit for detecting, this ultrared sensing circuit promptly stops to carry out ultrared sensing.
3. pyroelectric type infrared detector as claimed in claim 1 is characterized in that:
This hummer also is electrically connected on a light emitting diode, notifies the user to cooperate this hummer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910142312A CN101900837B (en) | 2009-05-27 | 2009-05-27 | Pyroelectric type infrared detector and control method thereof |
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| CN200910142312A CN101900837B (en) | 2009-05-27 | 2009-05-27 | Pyroelectric type infrared detector and control method thereof |
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| CN101900837A CN101900837A (en) | 2010-12-01 |
| CN101900837B true CN101900837B (en) | 2012-09-05 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1434242A (en) * | 2002-01-21 | 2003-08-06 | 诠兴开发科技股份有限公司 | Energy-saving type LED lamp set |
| CN201037611Y (en) * | 2007-04-29 | 2008-03-19 | 费子翔 | LED desk lamp with automatic light stabilizing function |
| CN101330791A (en) * | 2008-07-25 | 2008-12-24 | 中山市欧普照明股份有限公司 | Intelligent induction fluorescent lamp |
| CN201216680Y (en) * | 2008-06-18 | 2009-04-08 | 侯渐晨 | Portable multifunctional hypometropia prevention instrument |
-
2009
- 2009-05-27 CN CN200910142312A patent/CN101900837B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1434242A (en) * | 2002-01-21 | 2003-08-06 | 诠兴开发科技股份有限公司 | Energy-saving type LED lamp set |
| CN201037611Y (en) * | 2007-04-29 | 2008-03-19 | 费子翔 | LED desk lamp with automatic light stabilizing function |
| CN201216680Y (en) * | 2008-06-18 | 2009-04-08 | 侯渐晨 | Portable multifunctional hypometropia prevention instrument |
| CN101330791A (en) * | 2008-07-25 | 2008-12-24 | 中山市欧普照明股份有限公司 | Intelligent induction fluorescent lamp |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平11-37839A 1999.02.12 |
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| CN101900837A (en) | 2010-12-01 |
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Granted publication date: 20120905 |