CN204068914U - Proximity inductive switch - Google Patents
Proximity inductive switch Download PDFInfo
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- CN204068914U CN204068914U CN201420147233.XU CN201420147233U CN204068914U CN 204068914 U CN204068914 U CN 204068914U CN 201420147233 U CN201420147233 U CN 201420147233U CN 204068914 U CN204068914 U CN 204068914U
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Abstract
The utility model relates to a kind of proximity inductive switch, comprising: conduction inductor, for receiving the electrostatic charge of human body when human body proximity; Capacitance controller, for the charging and discharging based on described electrostatic charge control capacitance to generate valve drive signal; Valve-driving circuit, for the opening and closing based on described valve drive signal by-pass valve control.Implement proximity inductive switch of the present utility model, being used as transducer owing to have employed conduction inductor self, just can realizing close to induction without the need to installing independently transducer.And because there is not independently transducer, there is no the problem in transducer useful life.Due to by responding to static electricity on human body's electric charge, therefore non-directive, as long as can trigger out close to inductor and close.In addition, owing to controlling based on the charging and discharging of described electrostatic charge control capacitance, therefore different distance of reaction can be set according to user.
Description
Technical field
The utility model relates to inductive switch field, more particularly, relates to a kind of proximity inductive switch.
Background technology
Existing inductive switch typically uses infrared proximity transducer or common capacitance inductor produces switch controlling signal.Drive circuit is based on this switch controlling signal Controlling solenoid valve switch.But infrared sensing switch needs independence or integrated installation infrared proximity transducer.Because infrared proximity transducer is in running order for a long time, useful life is limited.And infrared proximity transducer has directive property, induction region is relatively little, and therefore in use, user will enter the region ability trigger switch that infrared proximity transducer is specified.And the distance of reaction of common capacitance-sensitive switch is very short, and can not change.
Therefore, need a kind of without the need to additionally installing the proximity inductive switch that the comparatively large and distance of reaction of proximity transducer, induction region can set.
Utility model content
The technical problems to be solved in the utility model is, proximity inductive switch for prior art needs additionally to install the less and defect that distance of reaction is fixing of proximity transducer, induction region, provides a kind of without the need to additionally installing the proximity inductive switch that the comparatively large and distance of reaction of proximity transducer, induction region can set.
The utility model solves the technical scheme that its technical problem adopts: construct a kind of proximity inductive switch, comprise: for receiving the conduction inductor of the electrostatic charge of human body when human body proximity, for the charging and discharging based on described electrostatic charge control capacitance to generate the capacitance controller of valve drive signal, for the valve-driving circuit of the opening and closing based on described valve drive signal by-pass valve control; Wherein said conduction inductor, described capacitance controller and described valve-driving circuit are electrically connected.
In proximity inductive switch described in the utility model, described capacitance controller comprises further: for carrying out the capacitor charge and discharge circuit of charging and discharging to electric capacity based on described electrostatic charge, for generating the pulse-width modulator of duty cycle signals according to predetermined set, for generating the Bitstream signal maker of Bitstream signal based on described charging and discharging, for generating the counter of counting based on described duty cycle signals and described Bitstream signal, for generating the processor of valve drive signal based on described counting, wherein said capacitor charge and discharge circuit is electrically connected with described Bitstream signal maker, described Bitstream signal maker and described pulse-width modulator are electrically connected with described counter, described counter is electrically connected with described processor.
In proximity inductive switch described in the utility model, described capacitor charge and discharge circuit comprises inductance capacitance, external modulation electric capacity and discharge resistance, the first end of described inductance capacitance is connected to power supply through the first control switch, second end ground connection of described inductance capacitance, the first end of described external modulation electric capacity is connected to power supply through the second control switch and described first control switch successively, second end ground connection of described external modulation electric capacity, the first end of described discharge resistance is connected to the first end of described external modulation electric capacity and described Bitstream signal maker, second end of described discharge resistance is through the 3rd control switch ground connection.
In proximity inductive switch described in the utility model, described Bitstream signal maker comprises comparator and latch, the first input end of described comparator connects described capacitor charge and discharge circuit, the second input of described comparator connects reference voltage signal, the output of described comparator connects the input of described latch, and the output of described latch connects described counter and described capacitor charge and discharge circuit.
In proximity inductive switch described in the utility model, described counter comprises and door sum counter, is describedly connected described pulse-width modulator with the first input end of door, is describedly connected described Bitstream signal maker, the described input being connected described counter with the output of door with the second input of door.
In proximity inductive switch described in the utility model, described capacitance controller comprises the clock generator for generated clock signal further.
In proximity inductive switch described in the utility model, described clock generator comprises clock source, oscillator, channel-splitting filter, described clock source is connected with the input of described oscillator, the output of described oscillator connects the input of described channel-splitting filter, and the output of described channel-splitting filter connects the clock end of described pulse-width modulator, described Bitstream signal maker and described counter respectively.
Another technical scheme that the utility model solves the employing of its technical problem is, construct a kind of proximity inductive switch, comprise: for receive when human body proximity the electrostatic charge of human body conduction inductor, for responding to inductance capacitance, external modulation electric capacity, the discharge resistance of described electrostatic charge, comparator, latch, with door, pulse-width modulator, counter, processor, for generating valve-driving circuit and the valve of valve drive signal, the first end of described inductance capacitance is connected to power supply through the first control switch, second end ground connection of described inductance capacitance, the first end of described external modulation electric capacity is connected to power supply through the second control switch and described first control switch successively, second end ground connection of described external modulation electric capacity, the first end of described discharge resistance is connected to the first end of described external modulation electric capacity and the first input end of described comparator, second end of described discharge resistance is through the 3rd control switch ground connection, second input of described comparator connects reference voltage signal, the output of described comparator connects the input of described latch, the output of described latch connects described 3rd control switch and the second input that is described and door, describedly be connected described pulse-width modulator with the first input end of door, the described input being connected described counter with the output of door, the output of described counter connects described processor, described processor is electrically connected with described valve-driving circuit.
In proximity inductive switch described in the utility model, described capacitance controller comprises the clock generator for generated clock signal further.
In proximity inductive switch described in the utility model, described clock generator comprises clock source, oscillator, channel-splitting filter, described clock source is connected with the input of described oscillator, the output of described oscillator connects the input of described channel-splitting filter, and the output of described channel-splitting filter connects the clock end of described pulse-width modulator, described latch and described counter respectively.
Implement proximity inductive switch of the present utility model, being used as transducer owing to have employed conduction inductor self, just can realizing close to induction without the need to installing independently transducer.And because there is not independently transducer, there is no the problem in transducer useful life.Due to by responding to static electricity on human body's electric charge, therefore non-directive, as long as can trigger out close to inductor and close.In addition, owing to controlling based on the charging and discharging of described electrostatic charge control capacitance, therefore different distance of reaction can be set according to user.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the theory diagram of the first embodiment of proximity inductive switch of the present utility model;
Fig. 2 is the theory diagram of the second embodiment of proximity inductive switch of the present utility model;
Fig. 3 is the circuit theory diagrams of the 3rd embodiment of proximity inductive switch of the present utility model;
Fig. 4 is the equivalent circuit diagram of the modulating mode of the proximity inductive switch shown in Fig. 3;
Fig. 5 is the output voltage wave figure of the charge and discharge process of the proximity inductive switch shown in Fig. 3;
Fig. 6 is the comparator output waveform figure of the charge and discharge process of the proximity inductive switch shown in Fig. 3;
Fig. 7 is the principle schematic of the counting process of the charge and discharge process of the proximity inductive switch shown in Fig. 3.
Embodiment
Fig. 1 is the theory diagram of the first embodiment of proximity inductive switch of the present utility model.As shown in Figure 1, described proximity inductive switch comprises conduction inductor 100, capacitance controller 200, valve-driving circuit 300 and valve 400.Described conduction inductor 100 is for receiving the electrostatic charge of human body when human body proximity.Such as, this conduction inductor 100 can be any metal inductor, graphite body, polymer inductor or other electric conducting material inductors.In preferred embodiment of the present utility model, this conduction inductor 100 can be such as metal faucet, controls metal key-press of electric light, TV, refrigerator etc. household electrical appliance etc.Described capacitance controller 200 for the charging and discharging based on described electrostatic charge control capacitance to generate valve drive signal.Described capacitance controller 200 receives electrostatic charge from described conduction inductor 100.Because people is close and when leaving, the electrostatic charge quantity received is different, this will cause the charging and discharging time of electric capacity different.Described capacitance controller 200 can generate valve drive signal based on this difference.Described valve-driving circuit 300 receives this valve drive signal from described capacitance controller 200, and based on the opening and closing of this valve drive signal by-pass valve control 400.In an embodiment of the present utility model, this valve 400 can be electromagnetically operated valve, and described valve-driving circuit 300 can be driving circuit for electromagnetic valve.In other embodiments of the present utility model, this valve can be other switching devices, such as triode, transistor etc.And described valve-driving circuit 300 can be transistor drive circuit or transistor driver circuit etc.
Implement proximity inductive switch of the present utility model, being used as transducer owing to have employed conduction inductor self, just can realizing close to induction without the need to installing independently transducer.And because there is not independently transducer, there is no the problem in transducer useful life.Due to by responding to static electricity on human body's electric charge, therefore non-directive, as long as can trigger out close to inductor and close.In addition, owing to controlling based on the charging and discharging of described electrostatic charge control capacitance, therefore different distance of reaction can be set according to user.
Fig. 2 is the theory diagram of the second embodiment of proximity inductive switch of the present utility model.As shown in Figure 2, described proximity inductive switch comprises conduction inductor 100, capacitance controller 200, valve-driving circuit 300 and valve 400.In the present embodiment, described conduction inductor 100, valve-driving circuit 300 and valve 400 can build according to the embodiment shown in Fig. 1, have just been not repeated at this.
In the present embodiment, described capacitance controller 200 comprises capacitor charge and discharge circuit 210, pulse-width modulator 220, Bitstream signal maker 230, counter 240 and processor 250.In the present embodiment, described capacitor charge and discharge circuit 210 is for carrying out charging and discharging based on described electrostatic charge to electric capacity.Such as, described capacitor charge and discharge circuit 210 can be any LC charge-discharge circuit, or LRC charge-discharge circuit.Described pulse-width modulator 220 is for generating duty cycle signals according to predetermined set.Such as described pulse-width modulator 220 can be any pulse width modulation circuit, chip or program module.Described Bitstream signal maker 230 is for generating Bitstream signal based on described charging and discharging.Such as, described Bitstream signal maker 230 can generate Bitstream signal according to discharge and recharge time and voltage swing.Described counter 240 is for generating counting based on described duty cycle signals and described Bitstream signal.Such as, described counter 240 can adopt any counter to count.Described processor 250 can generate valve drive signal based on described counting.Such as, when described counting is greater than setting numerical value time, the valve drive signal opened is generated.When described counting is less than setting numerical value time, generate the valve drive signal of closing.
Implement proximity inductive switch of the present utility model, being used as transducer owing to have employed conduction inductor self, just can realizing close to induction without the need to installing independently transducer.And because there is not independently transducer, there is no the problem in transducer useful life.Due to by responding to static electricity on human body's electric charge, therefore non-directive, as long as can trigger out close to inductor and close.In addition, owing to controlling based on the charging and discharging of described electrostatic charge control capacitance, therefore different distance of reaction can be set according to user.
Fig. 3 is the circuit theory diagrams of the 3rd embodiment of proximity inductive switch of the present utility model.The structure of capacitance controller 200 is basically illustrated in Fig. 3.As shown in Figure 3, capacitance controller 200 comprises inductance capacitance Cx, external modulation electric capacity Cmod, discharge resistance RB, comparator F1, latch L1, with door Y1, pulse-width modulator PWM, counter CN1, processor 250.Wherein inductance capacitance Cx, external modulation electric capacity Cmod, discharge resistance RB constitute the capacitor charge and discharge circuit 210 shown in Fig. 2.Pulse-width modulator 220 shown in pulse-width modulator PWM pie graph 2.Comparator F1, latch L1 constitute the Bitstream signal maker 230 shown in Fig. 2.With the counter 240 shown in door Y1, counter CN1 pie graph 2.
As shown in Figure 3, the first end of described inductance capacitance Cx is connected to the second end ground connection of power vd D, described inductance capacitance Cx through the first control switch φ 1.The first end of described external modulation electric capacity Cmod is successively through the second control switch
with the first control switch
be connected to power vd D.The second end ground connection of described external modulation electric capacity Cmod.The first end of described discharge resistance RB is connected to the first end of described external modulation electric capacity Cmod and the first input end of described comparator F1.Second end of described discharge resistance RB is through the 3rd control switch
ground connection, second input of described comparator F1 connects reference voltage signal VREF.The output of described comparator F1 connects the input of described latch L1.The output of described latch L1 connects described 3rd control switch
with described the second input with door Y1.Describedly be connected described pulse-width modulator PWM with the first input end of door Y1.The described input being connected described counter CN1 with the output of door Y1 counts to export.Described processor 250 generates valve drive signal based on described counting.
Fig. 4 is the equivalent circuit diagram of the modulating mode of the proximity inductive switch shown in Fig. 3.Fig. 5 is the output voltage wave figure of the charge and discharge process of the proximity inductive switch shown in Fig. 3.Fig. 6 is the comparator output waveform figure of the charge and discharge process of the proximity inductive switch shown in Fig. 3.Fig. 7 is the principle schematic of the counting process of the charge and discharge process of the proximity inductive switch shown in Fig. 3.Below in conjunction with Fig. 4-7, the principle of the proximity inductive switch shown in Fig. 3 is described as follows.
As shown in Figure 3-4, the first control switch
time closed, power vd D is utilized to charge to inductance capacitance Cx.First control switch
disconnect and the second control switch
during disconnection, inductance capacitance Cx is utilized to charge to outside modulating capacitor Cmod.When Cmod charging voltage reaches reference voltage Vref, comparator F1 exports high level.Latch L1 will latch high level.The high level of latch L1 controls the 3rd control switch
closed, thus utilize discharge resistance RB to discharge.The enable described pulse-width modulator PWM of latch L1 outputs to and door Y1; Until latch L1 has new state to upgrade.The Bitstream signal that the duty ratio exported in conjunction with described pulse-width modulator PWM with door Y1 and latch L1 export, and provide it to the input of counter CN1.Counter CN1 exports and count down to processor 250.Finally the value of counter CN1 is carried out process has judged whether finger touch to processor 250.
Composition graphs 3 and Fig. 5 known, described inductance capacitance Cx can be converted to equivalent resistance Rcx.Resistance Vdd is charged to outside modulating capacitor Cmod by equivalent resistance Rcx, knows that charging reaches reference voltage Vref.Comparator F1 exports high level, latch L1 latches high level, discharge resistance RB accesses ground, outside modulating capacitor Cmod is discharged, when external modulation electric capacity Cmod voltage is lower than reference voltage Vref, comparator F1 output low level, discharge resistance RB disconnects over the ground, and power supply Vdd charges to outside modulating capacitor Cmod again.In charge and discharge process, external modulation electric capacity Cmod voltage V (Cmod) and comparator F1 exports as Fig. 5-6.
Have people close to or touch conduction inductor 100 time, described conduction inductor 100 is for receiving the electrostatic charge of human body at human body proximity or when touching.Now inductance capacitance Cx increases, and equivalent resistance Rcx just diminishes.Equivalent resistance Rcx just diminishes, and charging current just becomes large, and the charging interval of external modulation electric capacity Cmod just shortens.When the external modulation electric capacity Cmod charging interval shorten and discharge time constant.At this moment, by asking with afterwards with door Y1 by the duty cycle signals from pulse-width modulator PWM and the described Bitstream signal from latch L1, the duty ratio of acquisition becomes large, can open counter CN1 for more time.Because the time of opening counter CN1 is longer, counter CN1 counts more, as shown in Figure 7.By adopting processor 250 can the value of computing counter, then judged whether people close to or touch conduction inductor 100.Such as, when described counting be greater than setting numerical value time, judge have people close to or touch conduction inductor 100, generate open valve drive signal.When described counting is less than setting numerical value time, judge that nobody is close or touch conduction inductor 100, generating the valve drive signal opened.
In the embodiment shown in fig. 3, the clock generator that capacitance controller 200 also comprises clock source PRS, oscillator OS1, channel-splitting filter r is formed.As shown in Figure 3, described clock source PRS is connected with the input of described oscillator OS1.The output of described oscillator OS1 connects the input of described channel-splitting filter r.The output of described channel-splitting filter r connects the clock end of described pulse-width modulator PWM, described latch L1 and described counter CN1 respectively.As shown in Figure 3, described clock source PRS controls the first control switch simultaneously
with the second control switch
in other embodiments of the present utility model, those skilled in the art can respectively at described pulse-width modulator PWM, described latch L1 and described counter CN1 onboard clock, also can in processor 250 onboard clock, or adopt processor 250 control the first control switch
with the second control switch
Implement proximity inductive switch of the present utility model, being used as transducer owing to have employed conduction inductor self, just can realizing close to induction without the need to installing independently transducer.And because there is not independently transducer, there is no the problem in transducer useful life.Due to by responding to static electricity on human body's electric charge, therefore non-directive, as long as can trigger out close to inductor and close.In addition, owing to controlling based on the charging and discharging of described electrostatic charge control capacitance, therefore different distance of reaction can be set according to user.Further, because the utility model is not as traditional approach, capacitance voltage is carried out measuring thus has but determined whether that people is close or touch, but by judging whether charging voltage is greater than reference voltage, therefore be reduced to minimum by the precision problem that voltage transitions causes, therefore sensitivity is better.
Although the utility model is described by specific embodiment, it will be appreciated by those skilled in the art that, when not departing from the utility model scope, various conversion can also be carried out and be equal to substituting to the utility model.Therefore, the utility model is not limited to disclosed specific embodiment, and should comprise the whole execution modes fallen in the utility model right.
Claims (10)
1. a proximity inductive switch, it is characterized in that, comprise: for receiving the conduction inductor of the electrostatic charge of human body when human body proximity, for the charging and discharging based on described electrostatic charge control capacitance to generate the capacitance controller of valve drive signal, for the valve-driving circuit of the opening and closing based on described valve drive signal by-pass valve control; Wherein said conduction inductor, described capacitance controller and described valve-driving circuit are electrically connected.
2. proximity inductive switch according to claim 1, it is characterized in that, described capacitance controller comprises further: for carrying out the capacitor charge and discharge circuit of charging and discharging to electric capacity based on described electrostatic charge, for generating the pulse-width modulator of duty cycle signals according to predetermined set, for generating the Bitstream signal maker of Bitstream signal based on described charging and discharging, for generating the counter of counting based on described duty cycle signals and described Bitstream signal, for generating the processor of valve drive signal based on described counting, wherein said capacitor charge and discharge circuit is electrically connected with described Bitstream signal maker, described Bitstream signal maker and described pulse-width modulator are electrically connected with described counter, described counter is electrically connected with described processor.
3. proximity inductive switch according to claim 2, it is characterized in that, described capacitor charge and discharge circuit comprises inductance capacitance, external modulation electric capacity and discharge resistance, the first end of described inductance capacitance is connected to power supply through the first control switch, second end ground connection of described inductance capacitance, the first end of described external modulation electric capacity is connected to power supply through the second control switch and described first control switch successively, second end ground connection of described external modulation electric capacity, the first end of described discharge resistance is connected to the first end of described external modulation electric capacity and described Bitstream signal maker, second end of described discharge resistance is through the 3rd control switch ground connection.
4. proximity inductive switch according to claim 2, it is characterized in that, described Bitstream signal maker comprises comparator and latch, the first input end of described comparator connects described capacitor charge and discharge circuit, the second input of described comparator connects reference voltage signal, the output of described comparator connects the input of described latch, and the output of described latch connects described counter and described capacitor charge and discharge circuit.
5. proximity inductive switch according to claim 2, it is characterized in that, described counter comprises and door sum counter, is describedly connected described pulse-width modulator with the first input end of door, is describedly connected described Bitstream signal maker, the described input being connected described counter with the output of door with the second input of door.
6. the proximity inductive switch according to claim arbitrary in claim 2-5, is characterized in that, described capacitance controller comprises the clock generator for generated clock signal further.
7. proximity inductive switch according to claim 6, it is characterized in that, described clock generator comprises clock source, oscillator, channel-splitting filter, described clock source is connected with the input of described oscillator, the output of described oscillator connects the input of described channel-splitting filter, and the output of described channel-splitting filter connects the clock end of described pulse-width modulator, described Bitstream signal maker and described counter respectively.
8. a proximity inductive switch, it is characterized in that, comprise: for receive when human body proximity the electrostatic charge of human body conduction inductor, for responding to inductance capacitance, external modulation electric capacity, the discharge resistance of described electrostatic charge, comparator, latch, with door, pulse-width modulator, counter, processor, for generating valve-driving circuit and the valve of valve drive signal, the first end of described inductance capacitance is connected to power supply through the first control switch, second end ground connection of described inductance capacitance, the first end of described external modulation electric capacity is connected to power supply through the second control switch and described first control switch successively, second end ground connection of described external modulation electric capacity, the first end of described discharge resistance is connected to the first end of described external modulation electric capacity and the first input end of described comparator, second end of described discharge resistance is through the 3rd control switch ground connection, second input of described comparator connects reference voltage signal, the output of described comparator connects the input of described latch, the output of described latch connects described 3rd control switch and the second input that is described and door, describedly be connected described pulse-width modulator with the first input end of door, the described input being connected described counter with the output of door, the output of described counter connects described processor, described processor is electrically connected with described valve-driving circuit.
9. proximity inductive switch according to claim 8, is characterized in that, described capacitance controller comprises the clock generator for generated clock signal further.
10. proximity inductive switch according to claim 9, it is characterized in that, described clock generator comprises clock source, oscillator, channel-splitting filter, described clock source is connected with the input of described oscillator, the output of described oscillator connects the input of described channel-splitting filter, and the output of described channel-splitting filter connects the clock end of described pulse-width modulator, described latch and described counter respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420147233.XU CN204068914U (en) | 2014-03-28 | 2014-03-28 | Proximity inductive switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420147233.XU CN204068914U (en) | 2014-03-28 | 2014-03-28 | Proximity inductive switch |
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|---|---|
| CN204068914U true CN204068914U (en) | 2014-12-31 |
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| CN201420147233.XU Expired - Fee Related CN204068914U (en) | 2014-03-28 | 2014-03-28 | Proximity inductive switch |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105286129A (en) * | 2015-11-09 | 2016-02-03 | 珠海枫艾迪斯科技有限公司 | Falling-down preventing protective band for old person |
| CN106292383A (en) * | 2015-05-11 | 2017-01-04 | 阿里巴巴集团控股有限公司 | Control system and method |
| CN107786193A (en) * | 2017-08-28 | 2018-03-09 | 珠海格力电器股份有限公司 | Touch key detection method and device |
| CN116455380A (en) * | 2023-04-23 | 2023-07-18 | 无锡中微爱芯电子有限公司 | High-sensitivity touch CCT circuit with built-in capacitor and self-adaptive environment |
-
2014
- 2014-03-28 CN CN201420147233.XU patent/CN204068914U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292383A (en) * | 2015-05-11 | 2017-01-04 | 阿里巴巴集团控股有限公司 | Control system and method |
| CN105286129A (en) * | 2015-11-09 | 2016-02-03 | 珠海枫艾迪斯科技有限公司 | Falling-down preventing protective band for old person |
| CN107786193A (en) * | 2017-08-28 | 2018-03-09 | 珠海格力电器股份有限公司 | Touch key detection method and device |
| CN116455380A (en) * | 2023-04-23 | 2023-07-18 | 无锡中微爱芯电子有限公司 | High-sensitivity touch CCT circuit with built-in capacitor and self-adaptive environment |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141231 Termination date: 20170328 |