CN109410499A - A kind of warning circuit and alarm - Google Patents
A kind of warning circuit and alarm Download PDFInfo
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- CN109410499A CN109410499A CN201811414524.XA CN201811414524A CN109410499A CN 109410499 A CN109410499 A CN 109410499A CN 201811414524 A CN201811414524 A CN 201811414524A CN 109410499 A CN109410499 A CN 109410499A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit
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Abstract
The present embodiments relate to burglar alarm technical field, a kind of warning circuit and alarm are disclosed.Wherein, which includes: that sub-circuit occurs for signal, for generating and exporting the first signal；Capacitive proximity sensor, for when test object is close, output to detect signal；Divide sub-circuit, sub-circuit occurs with the signal respectively, the capacitive proximity sensor is connect, for when not receiving the detection signal, first signal is divided, export second signal, when receiving the detection signal, first signal is divided according to the detection signal, exports third signal；Alarm sub-circuit, connect with the partial pressure sub-circuit, if not working for receiving the second signal, if receiving the third signal, alarms.In the above manner, the present embodiment can be effectively reduced cost without using pyroelectric sensor.
Description
Technical field
The present invention relates to burglar alarm technical fields, and in particular to a kind of warning circuit and alarm.
Background technique
With progress of the epoch, more stringent requirements are proposed for safety of the people to oneself local environment, especially it is in
Secure context is occupied, all there is certain requirement in many places to antitheft.Current anti-theft warning circuit, it is most of to be passed using pyroelectricity
Sensor.Pyroelectric sensor is a kind of noncontacting proximity sensor, can detect human infrared radiation, to detect whether human body
It passes through or passes through.
Inventor has found that the pyroelectricity that current warning circuit uses senses during realizing the embodiment of the present invention
Device, higher cost.
Summary of the invention
In order to solve the above technical problems, it is an object of that present invention to provide a kind of warning circuit and alarms, without using heat
Electric transducer is released, can be effectively reduced cost.
To achieve the goals above, the embodiment of the invention discloses following technical solutions:
The present invention provides a kind of warning circuits, comprising: sub-circuit occurs for signal, for generating and exporting the first signal；
Capacitive proximity sensor, for when test object is close, output to detect signal；Divide sub-circuit, respectively with the signal
Sub-circuit, capacitive proximity sensor connection occurs, for believing described first when not receiving the detection signal
It number is divided, second signal is exported, when receiving the detection signal, according to the detection signal to first signal
It is divided, exports third signal；Alarm sub-circuit, connect with the partial pressure sub-circuit, if for receiving second letter
Number, it does not work, if receiving the third signal, alarms.
In some embodiments, the warning circuit further include: signal processing sub-circuit, the partial pressure sub-circuit pass through institute
Signal processing sub-circuit is stated to connect with the alarm sub-circuit, the signal processing sub-circuit be used for the second signal or
The third signal is buffered, rectified and is filtered, and will treated the second signal or third signal output
To the alarm sub-circuit.
In some embodiments, first signal is oscillator signal, and the partial pressure sub-circuit includes: electric resistance partial pressure branch
With capacitance partial pressure branch, the electric resistance partial pressure branch and the capacitance partial pressure branch occur sub-circuit with the signal respectively and connect
It connects, the electric resistance partial pressure branch is connect with the capacitance partial pressure branch, the capacitive proximity sensor and the capacitance partial pressure
Branch connection；The signal processing sub-circuit includes: the first signal processing branch and second signal processing branch, first letter
The input terminal of number processing branch is connect with the capacitance partial pressure branch, the input terminal and the electricity of the second signal processing branch
Resistance partial pressure branch connection, the output end difference of the output end of the first signal processing branch and second signal processing branch
It is connect with the alarm sub-circuit.
In some embodiments, it includes: first resistor, second resistance, 3rd resistor, the 4th that sub-circuit, which occurs, for the signal
Resistance, first capacitor, the second capacitor and the first operational amplifier；The first end of the first resistor and first operation amplifier
The inverting input terminal of device connects, and the second end of the first resistor is connect with the first end of the first capacitor, first electricity
The second end of appearance is connect with the output end of first operational amplifier, the first end of the second resistance and first operation
The inverting input terminal of amplifier connects, the second end ground connection of the second resistance, one end of second capacitor and described first
The inverting input terminal of operational amplifier connects, the second end ground connection of second capacitor, the first end of the 3rd resistor and institute
The non-inverting input terminal connection of the first operational amplifier is stated, the second end of the 3rd resistor is defeated with first operational amplifier
Outlet connection, the first end of the 4th resistance are connect with the non-inverting input terminal of first operational amplifier, the 4th electricity
The second end of resistance is grounded, and the output end of first operational amplifier is for connecting the partial pressure sub-circuit.
In some embodiments, sub-circuit occurs for the signal further include: second operational amplifier；Second operation is put
The non-inverting input terminal of big device is connect with the output end of first operational amplifier, the anti-phase input of the second operational amplifier
End is connect with the output end of the second operational amplifier, and the output end of the second operational amplifier is for connecting the partial pressure
Sub-circuit.
In some embodiments, the electric resistance partial pressure branch includes: the 5th resistance, the 6th resistance and potentiometer, the electricity
Holding partial pressure branch includes: third capacitor and the 4th capacitor；The first end of 5th resistance and the second operational amplifier
Output end connection, the other end of the 5th resistance are connect with the first end of the potentiometer, the second termination of the potentiometer
The first end on ground, the third capacitor is connect with the output end of the second operational amplifier, the second end of the third capacitor
It is connect with the first end of the 4th capacitor, the second end ground connection of the 4th capacitor, the first end of the 6th resistance and institute
The second end connection of the 5th resistance is stated, one end of the 6th resistance is connect with the second end of the third capacitor；The capacitor
The first end of formula proximity sensor is grounded, and the second end of the second end of the capacitive proximity sensor and the third capacitor connects
It connects；The second end of the third capacitor is also used to connect the first signal processing branch, and the second end of the 5th resistance is also
For connecting the second signal processing branch.
In some embodiments, the first signal processing branch includes: third operational amplifier, first diode,
Seven resistance and the 5th capacitor, the non-inverting input terminal of the third operational amplifier are connect with the second end of the third capacitor, institute
The inverting input terminal for stating third operational amplifier is connect with the output end of the third operational amplifier, the third operation amplifier
The output end of device is connect with the anode of the first diode, and the first of the cathode of the first diode and the 7th resistance
End connection, the second end ground connection of the 7th resistance, first end of the cathode of the first diode also with the 5th capacitor
Connection, the second end ground connection of the 5th capacitor, the cathode of the first diode are also used to connect the alarm sub-circuit；Institute
Stating second signal processing branch includes: four-operational amplifier, the second diode, the 8th resistance and the 6th capacitor, and the described 4th
The inverting input terminal of operational amplifier is connect with the second end of the 5th resistance, the homophase input of the four-operational amplifier
End is connect with the output end of the four-operational amplifier, the output end of the four-operational amplifier and second diode
Anode connection, the cathode of second diode connect with the first end of the 8th resistance, the second of the 8th resistance
End ground connection, the cathode of second diode are also connect with the first end of the 6th capacitor, the second end of the 6th capacitor
Ground connection, the cathode of second diode are also used to connect the alarm sub-circuit.
In some embodiments, the alarm sub-circuit includes: comparison amplifier and buzzer；The comparison amplifier
Inverting input terminal is connect with the cathode of the first diode, the non-inverting input terminal of the comparison amplifier and the two or two pole
The cathode of pipe connects, and the output end of the comparison amplifier is connect with the first end of the buzzer, and the second of the buzzer
End ground connection.
In some embodiments, the warning circuit further include: power supply；Son electricity occurs with the signal respectively for the power supply
Road, the partial pressure sub-circuit, alarm sub-circuit connection.
The present invention also provides a kind of alarms, including above-mentioned warning circuit.
The beneficial effect of the embodiment of the present invention is: being in contrast to the prior art down, provided in an embodiment of the present invention one
Kind of warning circuit exports detection signal to dividing sub-circuit by capacitive proximity sensor when test object is close, so that
The signal for dividing sub-circuit output changes, and alarms to trigger alarm sub-circuit, without using pyroelectric sensor
Reach higher sensitivity, and controlled without using single-chip microcontroller, can be effectively reduced cost.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the structural schematic diagram of warning circuit provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the warning circuit of Fig. 1；
Fig. 3 is the structural schematic diagram of the warning circuit of Fig. 1；
Fig. 4 is the structural schematic diagram of alarm provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In addition, as long as technical characteristic involved in the various embodiments of the present invention described below is each other not
Constituting conflict can be combined with each other.
Current anti-theft warning circuit, it is most of to use pyroelectric sensor.Pyroelectric sensor is a kind of contactless
Sensor can detect human infrared radiation, to detect whether that human body is current or passes through.This pyroelectric sensor,
To obtain higher sensitivity, cost is also higher, and it also requires logic control is completed in the A/D detection of cooperation single-chip microcontroller together
System, so that cost is higher.
Based on this, the embodiment of the present invention provides a kind of warning circuit and alarm, without using pyroelectric sensor
Reach higher sensitivity, and controlled without using single-chip microcontroller, can be effectively reduced cost.
The warning circuit of the embodiment of the present invention can be used as one of functional unit, be independently arranged in alarm,
Can be used as be integrated into a functional module carry out using.
Specifically, with reference to the accompanying drawing, the embodiment of the present invention is further elaborated.
Fig. 1 is the structural schematic diagram of warning circuit provided in an embodiment of the present invention.As shown in Figure 1, warning circuit 100 wraps
Include: sub-circuit 110, capacitive proximity sensor 120, partial pressure sub-circuit 130, signal processing sub-circuit 140 and report occur for signal
Alert sub-circuit 150.
Wherein, signal generation sub-circuit 110, capacitive proximity sensor 120 are connect with partial pressure sub-circuit 130 respectively, point
Pressure sub-circuit 130 is connect by signal processing sub-circuit 140 with alarm sub-circuit 150.In the present embodiment, son electricity occurs for signal
Road 110 is for generating and exporting the first signal；Capacitive proximity sensor 120 is used for when test object is close, output detection
Signal；Partial pressure sub-circuit 130 is used to divide the first signal when not receiving detection signal, export second signal, when
When receiving detection signal, the first signal is divided according to detection signal, exports third signal；Signal processing sub-circuit
140 for second signal, perhaps third signal to be buffered, rectified and filtered and by treated second signal or third
Signal is exported to alarm sub-circuit 150；If alarm sub-circuit 150 does not work, for receiving second signal if receiving third
Signal is then alarmed.
Wherein, sub-circuit 110, which occurs, for signal to be oscillator or signal generator etc., can automatically generate and defeated
Signal out.In the present embodiment, it is wen-bridge oscillator that sub-circuit 110, which occurs, for signal, and sub-circuit 110 occurs for signal for generating the
One signal, and the first signal is exported to partial pressure sub-circuit 130.Wherein, the first signal is oscillator signal.
Wherein, the sensing that capacitive proximity sensor 120 is made of two parallel metal items (such as aluminium foil or tin piece)
Device has been capable of detecting whether that test object is close, wherein test object can be people or object.When there is no test object close
When, the capacitance very little of capacitive proximity sensor 120, and immobilize；When there is test object close, so that condenser type
The dielectric constant of proximity sensor 120 changes, so that the capacitance of capacitive proximity sensor 120 changes, thus
Output detection signal.Pyroelectric sensor is substituted using capacitive proximity sensor 120, can reduce cost, and make letter
It is single.
Wherein, referring to Figure 2 together, partial pressure sub-circuit 130 includes: electric resistance partial pressure branch 131 and capacitance partial pressure branch
132.Electric resistance partial pressure branch 131, capacitance partial pressure branch 132 occur sub-circuit 140 with signal respectively and connect, electric resistance partial pressure branch
131 connect with capacitance partial pressure branch 132, and capacitive proximity sensor 120 is connect with capacitance partial pressure branch 132.In the present embodiment
In, second signal includes first resistor voltage division signal and first capacitor voltage division signal, and third signal is believed including the second capacitance partial pressure
Number, when not receiving detection signal, electric resistance partial pressure branch 131 divides the first signal, output first resistor partial pressure letter
Number, capacitance partial pressure branch 132 divides the first signal, exports first capacitor voltage division signal, wherein first capacitor partial pressure letter
Number be greater than first resistor voltage division signal；When receiving detection signal, electric resistance partial pressure branch 131 divides the first signal,
First resistor voltage division signal is exported, capacitance partial pressure branch 132 divides the first signal according to detection signal, the second electricity of output
Hold voltage division signal, wherein the second Capacitive Voltage Divider is less than first resistor voltage division signal.
Wherein, referring to Figure 2 together, signal processing sub-circuit 140 is used to carry out the signal that partial pressure sub-circuit 130 exports
The processing such as buffering, rectification, filtering.Signal processing sub-circuit 140 includes the first signal processing branch 141 and second signal processing branch
Road 142.The input terminal of first signal processing branch 141 is connect with capacitance partial pressure branch 132, and second signal handles branch 142
Input terminal is connect with electric resistance partial pressure branch 131, and the output end of the first signal processing branch 141, second signal handle branch 142
Output end is connect with alarm sub-circuit 150 respectively.In the present embodiment, the first signal processing branch 141 is to capacitance partial pressure branch
After the first capacitor voltage division signal of 132 outputs or the second Capacitive Voltage Divider are handled, output to alarm sub-circuit 150；
After the first resistor voltage division signal that second signal processing branch 142 exports electric resistance partial pressure branch 131 is handled, output to report
Alert sub-circuit 150.
Wherein, alarm sub-circuit 150 is connect with the first signal processing branch 141, second signal processing branch 142 respectively,
The signal that signal and second signal processing branch 142 for comparing the output of the first signal processing branch 141 export, when receiving
The first resistor signal that the first capacitor signal and second signal processing branch 142 of first signal processing branch 141 output export
When, alarm sub-circuit 150 is without alarm, when the second capacitance signal and for receiving the output of the first signal processing branch 141
When binary signal handles the first resistor signal that branch 142 exports, alarm sub-circuit 150 is alarmed.
In further embodiments, signal processing sub-circuit 140 can be omitted, electric resistance partial pressure branch 131 and capacitance partial pressure
Branch 132 can be directly attached with alarm sub-circuit 150.
In the present embodiment, when test object is close, warning circuit 100 is exported by capacitive proximity sensor 120
Signal is detected to partial pressure sub-circuit 130, so that the signal that partial pressure sub-circuit 130 exports changes, to trigger alarm sub-circuit 150
It alarms, without using pyroelectric sensor, that is, can reach higher sensitivity, and control without using single-chip microcontroller, energy
It effectively reduces cost.
Specifically, referring to Fig. 3, it includes: first resistor R1, second resistance R2,3rd resistor that sub-circuit 110, which occurs, for signal
R3, the 4th resistance R4, first capacitor C1, the second capacitor C2 and the first operational amplifier IC1a.
Wherein, the first end of first resistor R1 is connect with the inverting input terminal of the first operational amplifier IC1a, first resistor
The second end of R1 is connect with the first end of first capacitor C1, and the second end of first capacitor C1 is defeated with the first operational amplifier IC1a's
Outlet connection, the first end of second resistance R2 are connect with the inverting input terminal of the first operational amplifier IC1a, second resistance R2's
Second end ground connection, one end of the second capacitor C2 are connect with the inverting input terminal of the first operational amplifier IC1a, the second capacitor C2's
Second end ground connection, the first end of 3rd resistor R3 are connect with the non-inverting input terminal of the first operational amplifier IC1a, 3rd resistor R3
Second end connect with the output end of the first operational amplifier IC1a, the first end of the 4th resistance R4 and the first operational amplifier
The non-inverting input terminal of IC1a connects, and the second end ground connection of the 4th resistance R4, the output end of the first operational amplifier IC1a is for connecting
Connect partial pressure sub-circuit 130.
Optionally, sub-circuit 110 occurs for signal further include: second operational amplifier IC1b, the first operational amplifier IC1a
Output end by second operational amplifier IC1b connection partial pressure sub-circuit 130.Wherein, the same phase of second operational amplifier IC1b
Input terminal is connect with the output end of the first operational amplifier IC1a, the inverting input terminal of second operational amplifier IC1b and the second fortune
The output end connection of amplifier IC1b is calculated, the output end of second operational amplifier IC1b is for connecting partial pressure sub-circuit 130.
In the present embodiment, first capacitor C1, first resistor R1 form series resonant circuit, the second capacitor C2, the second electricity
It hinders R2 and forms antiresonant circuit, series resonant circuit, antiresonant circuit and 3rd resistor R3, the 4th resistance R4 are constituted again
Measuring bridge, series resonant circuit and parallel resonance are respectively as high-pass filter and low-pass filter, so that son occurs for signal
Circuit 110 generates the wave spectrum of certain frequency, and outputting oscillation signal, and oscillator signal is delayed by second operational amplifier IC1b
Punching, is respectively outputted to electric resistance partial pressure branch 131 and capacitance partial pressure branch 132.
Electric resistance partial pressure branch 131 includes: the 5th resistance R5, the 6th resistance R6 and potentiometer RP1, capacitance partial pressure branch 132
It include: third capacitor C3 and the 4th capacitor C4.
Wherein, the first end of the 5th resistance R5 is connect with the output end of second operational amplifier IC1b, the 5th resistance R5's
The other end is connect with the first end of potentiometer RP1, the second end ground connection of potentiometer RP1, the first end and second of third capacitor C3
The output end of operational amplifier IC1b connects, and the second end of third capacitor C3 is connect with the first end of the 4th capacitor C4, the 4th electricity
Hold the second end ground connection of C4, the first end of the 6th resistance R6 is connect with the second end of the 5th resistance R5, one end of the 6th resistance R6
It is connect with the second end of third capacitor C3.The first end of capacitive proximity sensor 120 is grounded, capacitive proximity sensor 120
Second end connect with the second end of third capacitor C3.The second end of third capacitor C3 is also used to connect the first signal processing branch
141, first capacitor voltage division signal or the second Capacitive Voltage Divider are exported to the first signal processing branch 141；5th electricity
The second end of resistance R5 is also used to connect second signal processing branch 142, and first resistor voltage division signal is exported to second signal
Handle branch 142.
In the present embodiment, when capacitive proximity sensor 12 does not export detection signal, point of capacitance partial pressure branch 132
Pressure value is greater than the partial pressure value of electric resistance partial pressure branch 131；When there is test object close, the output inspection of capacitive proximity sensor 120
Signal is surveyed, the partial pressure value of capacitance partial pressure branch 132 reduces, and the partial pressure value of electric resistance partial pressure branch 131 is constant, so that capacitance partial pressure branch
The partial pressure value on road 132 is less than the partial pressure value of electric resistance partial pressure branch 131.
First signal processing branch 141 include: third operational amplifier IC1c, first diode D1, the 7th resistance R7 and
5th capacitor C5.Wherein, the non-inverting input terminal of third operational amplifier IC1c is connect with the second end of the third capacitor, third
The inverting input terminal of operational amplifier IC1c is connect with the output end of third operational amplifier IC1c, third operational amplifier IC1c
The anode of output end and first diode D1 connect, the cathode of first diode D1 is connect with the first end of the 7th resistance R7,
The second end of 7th resistance R7 is grounded, and the cathode of first diode D1 is also connect with the first end of the 5th capacitor C5, the 5th capacitor
The second end of C5 is grounded, and the cathode of first diode D1 is also used to connect alarm sub-circuit 150；
Second signal processing branch 142 include: four-operational amplifier IC1d, the second diode D2, the 8th resistance R8 and
6th capacitor C6.The inverting input terminal of four-operational amplifier IC1d is connect with the second end of the 5th resistance, the 4th operation
The non-inverting input terminal of amplifier IC1d is connect with the output end of four-operational amplifier IC1d, and four-operational amplifier IC1d's is defeated
Outlet is connect with the anode of the second diode D2, and the cathode of the second diode D2 is connect with the first end of the 8th resistance R8, and the 8th
The second end of resistance R8 is grounded, and the cathode of the second diode D2 is also connect with the first end of the 6th capacitor C6, the 6th capacitor C6's
Second end ground connection, the cathode of the second diode D2 are also used to connect alarm sub-circuit 150.
Sub-circuit 150 of alarming includes: comparison amplifier IC2 and buzzer HTD.Wherein, the reverse phase of comparison amplifier IC2 is defeated
Enter end to connect with the cathode of first diode D1, the cathode of the non-inverting input terminal of comparison amplifier IC2 and the second diode D2 connect
It connects, the output end of comparison amplifier IC2 is connect with the first end of buzzer HTD, the second end ground connection of buzzer HTD.Work as reception
When to by the first signal processing branch 141 and second signal processing treated the signal of branch 142, compare the big of two signals
It is small, and export whether control signal control buzzer HTD works.
Optionally, warning circuit 100 further include: power supply (not shown), power supply occur sub-circuit 110 with signal respectively, divide
Sub-circuit 130, signal processing sub-circuit 140, alarm sub-circuit 150 is pressed to connect, so that sub-circuit 110, partial pressure occur for signal
Sub-circuit 130, signal processing sub-circuit 140, alarm sub-circuit 150 are powered.
Optionally, the first operational amplifier IC1a, second operational amplifier IC1b, the third operation amplifier in the present embodiment
Device IC1c, four-operational amplifier IC1d are integrated on same circuit, such as can be LM324 four high guaily unit integrated circuit.
In the present embodiment, the course of work of warning circuit 100 is substantially are as follows: when no test object is close, signal occurs
Sub-circuit 110 exports the first signal, and the capacitance of capacitive proximity sensor 120 immobilizes, and electric resistance partial pressure branch 131 is to the
One signal is divided, and first resistor voltage division signal is exported, and capacitance partial pressure branch 132 divides the first signal, output the
One Capacitive Voltage Divider, wherein first capacitor voltage division signal is greater than first resistor voltage division signal, and first capacitor voltage division signal is passed through
It is exported after the processing of first signal processing branch 141 to the inverting input terminal of comparison amplifier IC2, first resistor voltage division signal warp
It exports after crossing the processing of second signal processing branch 142 to the non-inverting input terminal of comparison amplifier IC2, comparison amplifier IC2 is defeated
Low level out, buzzer HTD do not work；When there is test object close, signal occurs sub-circuit 110 and exports the first signal, electricity
The capacitance of capacitive proximity sensor 120 changes, the output detection signal of capacitive proximity sensor 120, electric resistance partial pressure branch
The partial pressure value on road 131 is constant, still exports first resistor voltage division signal, and the partial pressure value of capacitance partial pressure branch 132 reduces, output second
Capacitive Voltage Divider, wherein the second Capacitive Voltage Divider is less than first resistor voltage division signal, first resistor voltage division signal, second
Capacitive Voltage Divider is exported after the processing of signal processing sub-circuit 140 to comparison amplifier IC2, comparison amplifier IC2's
Non-inverting input terminal voltage is higher than inverting input terminal, and comparison amplifier IC2 exports high level, and buzzer HTD issues alarm, thus
Achieve the purpose that alarm.
In the present embodiment, when test object is close, warning circuit 100 is exported by capacitive proximity sensor 120
Signal is detected to capacitance partial pressure branch 132, so that the partial pressure value that capacitance partial pressure branch 132 exports changes, to trigger alarm
Circuit 150 is alarmed.Without using pyroelectric sensor, that is, it can reach higher sensitivity, and without using single-chip microcontroller
Control, can effectively reduce cost, and circuit is simple, reliable and stable.
Fig. 4 is the structural schematic diagram of alarm provided in an embodiment of the present invention.As shown in figure 4, the alarm 200 includes upper
State the warning circuit 100 in embodiment.
Optionally, which can also include shell 210, and warning circuit 100 can be integrated into one piece of circuit board
On, and install in shell 210.
Alarm 200 in the present embodiment includes warning circuit 100 at low cost, can be effectively reduced cost, and sensitive
Degree is high, reliable and stable.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；At this
It under the thinking of invention, can also be combined between the technical characteristic in above embodiments or different embodiment, step can be with
It is realized with random order, and there are many other variations of different aspect present invention as described above, for simplicity, they do not have
Have and is provided in details；Although the present invention is described in detail referring to the foregoing embodiments, the ordinary skill people of this field
Member is it is understood that it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of skill
Art feature is equivalently replaced；And these are modified or replaceed, each reality of the present invention that it does not separate the essence of the corresponding technical solution
Apply the range of a technical solution.
Claims (10)
1. a kind of warning circuit characterized by comprising
Sub-circuit occurs for signal, for generating and exporting the first signal；
Capacitive proximity sensor, for when test object is close, output to detect signal；
Sub-circuit is divided, is connect respectively with signal generation sub-circuit, the capacitive proximity sensor, for that ought not receive
When to the detection signal, first signal is divided, exports second signal, when receiving the detection signal,
First signal is divided according to the detection signal, exports third signal；
Alarm sub-circuit, connect, if not working for receiving the second signal, if receiving with the partial pressure sub-circuit
The third signal, then alarm.
2. warning circuit according to claim 1, which is characterized in that the warning circuit further include: signal processing electricity
Road,
The partial pressure sub-circuit is connect by the signal processing sub-circuit with the alarm sub-circuit, the signal processing electricity
It road, and will treated described second for the second signal or the third signal to be buffered, rectified and filtered
Signal or the third signal are exported to the alarm sub-circuit.
3. warning circuit according to claim 2, which is characterized in that first signal is oscillator signal,
The partial pressure sub-circuit includes: electric resistance partial pressure branch and capacitance partial pressure branch, the electric resistance partial pressure branch and the capacitor
Partial pressure branch occurs sub-circuit with the signal respectively and connect, and the electric resistance partial pressure branch is connect with the capacitance partial pressure branch,
The capacitive proximity sensor is connect with the capacitance partial pressure branch；
The signal processing sub-circuit includes: the first signal processing branch and second signal processing branch, at first signal
The input terminal of reason branch is connect with the capacitance partial pressure branch, the input terminal and the resistance point of the second signal processing branch
Press branch connection, the output end of the first signal processing branch and the second signal processing branch output end respectively with institute
State alarm sub-circuit connection.
4. warning circuit according to claim 3, which is characterized in that the signal occur sub-circuit include: first resistor,
Second resistance, 3rd resistor, the 4th resistance, first capacitor, the second capacitor and the first operational amplifier；
The first end of the first resistor is connect with the inverting input terminal of first operational amplifier, and the of the first resistor
Two ends are connect with the first end of the first capacitor, the output of the second end of the first capacitor and first operational amplifier
End connection, the first end of the second resistance are connect with the inverting input terminal of first operational amplifier, the second resistance
Second end ground connection, one end of second capacitor connect with the inverting input terminal of first operational amplifier, described second
The second end of capacitor is grounded, and the first end of the 3rd resistor is connect with the non-inverting input terminal of first operational amplifier, institute
The second end for stating 3rd resistor is connect with the output end of first operational amplifier, the first end of the 4th resistance with it is described
The non-inverting input terminal of first operational amplifier connects, the second end ground connection of the 4th resistance, first operational amplifier
Output end is for connecting the partial pressure sub-circuit.
5. warning circuit according to claim 4, which is characterized in that sub-circuit occurs for the signal further include: the second fortune
Calculate amplifier；
The non-inverting input terminal of the second operational amplifier is connect with the output end of first operational amplifier, second fortune
The inverting input terminal for calculating amplifier is connect with the output end of the second operational amplifier, the output of the second operational amplifier
End is for connecting the partial pressure sub-circuit.
6. warning circuit according to claim 5, which is characterized in that
The electric resistance partial pressure branch includes: the 5th resistance, the 6th resistance and potentiometer, and the capacitance partial pressure branch includes: third
Capacitor and the 4th capacitor；
The first end of 5th resistance is connect with the output end of the second operational amplifier, the other end of the 5th resistance
It is connect with the first end of the potentiometer, the second end of potentiometer ground connection, the first end of the third capacitor and described the
The output end of two operational amplifiers connects, and the second end of the third capacitor is connect with the first end of the 4th capacitor, described
The second end of 4th capacitor is grounded, and the first end of the 6th resistance is connect with the second end of the 5th resistance, and the described 6th
One end of resistance is connect with the second end of the third capacitor；
The first end of the capacitive proximity sensor is grounded, the second end of the capacitive proximity sensor and third electricity
The second end of appearance connects；
The second end of the third capacitor is also used to connect the first signal processing branch, and the second end of the 5th resistance is also
For connecting the second signal processing branch.
7. warning circuit according to claim 6, which is characterized in that
The first signal processing branch includes: third operational amplifier, first diode, the 7th resistance and the 5th capacitor, institute
The non-inverting input terminal for stating third operational amplifier is connect with the second end of the third capacitor, the third operational amplifier it is anti-
Phase input terminal is connect with the output end of the third operational amplifier, the output end of the third operational amplifier and described first
The anode connection of diode, the cathode of the first diode are connect with the first end of the 7th resistance, the 7th resistance
Second end ground connection, the cathode of the first diode also connect with the first end of the 5th capacitor, the 5th capacitor
Second end ground connection, the cathode of the first diode are also used to connect the alarm sub-circuit；
The second signal processing branch includes: four-operational amplifier, the second diode, the 8th resistance and the 6th capacitor, institute
The inverting input terminal for stating four-operational amplifier is connect with the second end of the 5th resistance, the four-operational amplifier it is same
Phase input terminal is connect with the output end of the four-operational amplifier, the output end of the four-operational amplifier and described second
The anode connection of diode, the cathode of second diode are connect with the first end of the 8th resistance, the 8th resistance
Second end ground connection, the cathode of second diode also connect with the first end of the 6th capacitor, the 6th capacitor
Second end ground connection, the cathode of second diode are also used to connect the alarm sub-circuit.
8. warning circuit according to claim 7, which is characterized in that the alarm sub-circuit include: comparison amplifier and
Buzzer；
The inverting input terminal of the comparison amplifier is connect with the cathode of the first diode, the same phase of the comparison amplifier
Input terminal is connect with the cathode of second diode, and the first end of the output end of the comparison amplifier and the buzzer connects
It connects, the second end ground connection of the buzzer.
9. warning circuit according to claim 1-8, which is characterized in that the warning circuit further include: power supply；
The power supply occurs sub-circuit, the partial pressure sub-circuit, the alarm sub-circuit with the signal respectively and connect.
10. a kind of alarm, which is characterized in that including the described in any item warning circuits of claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811414524.XA CN109410499A (en) | 2018-11-26 | 2018-11-26 | A kind of warning circuit and alarm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811414524.XA CN109410499A (en) | 2018-11-26 | 2018-11-26 | A kind of warning circuit and alarm |
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| CN109410499A true CN109410499A (en) | 2019-03-01 |
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| CN201811414524.XA Pending CN109410499A (en) | 2018-11-26 | 2018-11-26 | A kind of warning circuit and alarm |
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| CN1539123A (en) * | 2001-02-07 | 2004-10-20 | �����״ļ������й�˾ | Control system with capacitive detector |
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