CN102412822A - Proximity switch - Google Patents

Proximity switch Download PDF

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Publication number
CN102412822A
CN102412822A CN2011103545035A CN201110354503A CN102412822A CN 102412822 A CN102412822 A CN 102412822A CN 2011103545035 A CN2011103545035 A CN 2011103545035A CN 201110354503 A CN201110354503 A CN 201110354503A CN 102412822 A CN102412822 A CN 102412822A
Authority
CN
China
Prior art keywords
capacitor
end
bridge rectifier
transistor
diode bridge
Prior art date
Application number
CN2011103545035A
Other languages
Chinese (zh)
Inventor
戴隆党
Original Assignee
浙江正泰机床电气制造有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 浙江正泰机床电气制造有限公司 filed Critical 浙江正泰机床电气制造有限公司
Priority to CN2011103545035A priority Critical patent/CN102412822A/en
Publication of CN102412822A publication Critical patent/CN102412822A/en

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Abstract

The invention relates to a switch, in particular to a proximity switch. The proximity switch is characterized by consisting of a capacitance bridge detection circuit, a diode bridge rectifier and a switch amplifying circuit which are connected in a matching way, wherein the capacitance bridge detection circuit consists of capacitors C1-C4; the diode bridge rectifier consists of diodes VD1-VD4; the switch amplifying circuit consists of transistors VT1-VT3, a voltage stabilizing diode VD5, a capacitor C5 and a relay K; the input end of the capacitance bridge detection circuit is connected with 220V commercial power, and the output end of the capacitance bridge detection circuit is connected with the input end of the diode bridge rectifier; the output end of the diode bridge rectifier is connected with the switch amplifying circuit; and the two ends of the input end of the diode bridge rectifier are connected with a metal sheet A and a metal sheet B respectively. The proximity switch can be used be applied to burglary prevention alarm, automatic notification, automatic protection and the like, runs stably, is prevented from being interfered easily and performing error actions, and has low production cost.

Description

Near switch

Technical field

The present invention relates to a kind of switch, be specially a kind of near switch.

Background technology

Existing have multiplely near the formula switch, common has inductance approach switch, inductance approach switch, ultrasonic type near switch.Inductance approach switch is made up of LC high-frequency generator and amplification treatment circuit, utilizes metal object when the vibration inductive head that can generate an electromagnetic field near this, makes the inner eddy current that produces of metal object.This eddy current reacts on high-frequency generator, makes the decay of high-frequency generator vibration ability, and the parameter of internal circuit changes, identify thus to have or not metal object approaching, and then the logical or end of control switch.This object that can detect near the formula switch must be a metal object.

Though this structure can effectively reflect the existence of metal object; But there is not on-delay protection box overcurrent protection function; In actual use, the normal existence connected the misoperation of moment near switch, or under short circuit or overcurrent condition, works and cause transistor damage; Reduction increases use cost near the reliability of switch.

Summary of the invention

To the problem that exists in the prior art, the object of the present invention is to provide a kind of working stability, be not subject to disturb the technical scheme that causes malfunction near switch.

Described near switch; It is characterized in that forming by the electric capacity bridge detection circuit that is connected, diode bridge rectifier and switch amplifying circuit; The electric capacity bridge detection circuit is made up of capacitor C 1-C4; Diode bridge rectifier is made up of diode VD1-VD4, and the switch amplifying circuit is made up of transistor VT1-VT3, voltage stabilizing didoe VD5, capacitor C 5 and relay K; The input of electric capacity bridge detection circuit links to each other with the 220V civil power, and its output links to each other with the input of diode bridge rectifier, and the output of diode bridge rectifier links to each other with the switch amplifying circuit; The two ends of described diode bridge rectifier input also connect respectively sheet metal A and sheet metal B are set.

Described near switch; It is characterized in that capacitor C 1 one ends of described electric capacity bridge detection circuit and an end of capacitor C 2 are connected 220V electric main one end respectively; The other end of capacitor C 1 other end and capacitor C 2 is connected an end of capacitor C 3 and an end of capacitor C 4 respectively, and the other end of capacitor C 3 and the other end of capacitor C 4 are connected the other end of 220V electric main respectively; The input of described switch amplifying circuit connects the output of diode bridge rectifier; The input of diode bridge rectifier is connected between capacitor C 1 and the capacitor C 3, between capacitor C 2 and the capacitor C 4; One end of diode bridge rectifier output connects the base stage of transistor VT1; The other end of diode bridge rectifier output connects the emitter of transistor VT1; The collector electrode of transistor VT1 connects the base stage of transistor VT2, and the emitter of transistor VT2 connects the base stage of transistor VT3, and the emitter of transistor VT3 connects the emitter of transistor VT1; Coil one end of the collector connection relay K of transistor VT3; The collector electrode of transistor VT2 connects the coil other end of relay K, the negative pole of voltage stabilizing didoe VD5 and the positive pole of capacitor C 5 respectively, and the positive pole of voltage stabilizing didoe VD5 connects transformer T secondary one end, and the negative pole of capacitor C 5 connects the emitter of transistor VT3 and the other end of transformer T secondary.

Described near switch, it is characterized in that described transistor VT1 adopts 3DG6, transistor VT2 adopts 3DG14, and transistor VT3 adopts 3DG12.

Described near switch, it is characterized in that described capacitor C 1-C4 is 100p.

The present invention can be used for burglar alarm, notifies automatically, protection etc. automatically, the contact of relay is connected in the circuit that needs control, as the people near the time; Diode bridge rectifier output signal; This signal makes transistor VT2 conducting, thereby relay must be conducted, and its normally opened contact becomes normally closed; Thereby control the break-make of coupled circuit, play on-off action; Its working stability, and be not subject to disturb and cause misoperation, production cost is low.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is an electrical block diagram of the present invention.

Embodiment

Below in conjunction with Figure of description the present invention is further specified:

Near switch, to form by the electric capacity bridge detection circuit 1 that is connected, diode bridge rectifier 2 and switch amplifying circuit 3, electric capacity bridge detection circuit 1 is made up of capacitor C 1-C4; Capacitor C 1-C4 is 100p; Diode bridge rectifier 2 is made up of diode VD1-VD4, and switch amplifying circuit 3 is made up of transistor VT1-VT3, voltage stabilizing didoe VD5, capacitor C 5 and relay K, and transistor VT1 adopts 3DG6; Transistor VT2 adopts 3DG14, and transistor VT3 adopts 3DG12; The input of electric capacity bridge detection circuit 1 links to each other with the 220V civil power, and its output links to each other with the input of diode bridge rectifier 2, and the output of diode bridge rectifier 2 links to each other with switch amplifying circuit 3; The two ends of described diode bridge rectifier 2 inputs also connect respectively sheet metal A and sheet metal B are set.

Capacitor C 1 one ends of electric capacity bridge detection circuit and an end of capacitor C 2 are connected 220V electric main one end respectively; The other end of capacitor C 1 other end and capacitor C 2 is connected an end of capacitor C 3 and an end of capacitor C 4 respectively, and the other end of capacitor C 3 and the other end of capacitor C 4 are connected the other end of 220V electric main respectively; The input of described switch amplifying circuit connects the output of diode bridge rectifier; The input of diode bridge rectifier is connected between capacitor C 1 and the capacitor C 3, between capacitor C 2 and the capacitor C 4; One end of diode bridge rectifier output connects the base stage of transistor VT1; The other end of diode bridge rectifier output connects the emitter of transistor VT1; The collector electrode of transistor VT1 connects the base stage of transistor VT2, and the emitter of transistor VT2 connects the base stage of transistor VT3, and the emitter of transistor VT3 connects the emitter of transistor VT1; Coil one end of the collector connection relay K of transistor VT3; The collector electrode of transistor VT2 connects the coil other end of relay K, the negative pole of voltage stabilizing didoe VD5 and the positive pole of capacitor C 5 respectively, and the positive pole of voltage stabilizing didoe VD5 connects transformer T secondary one end, and the negative pole of capacitor C 5 connects the emitter of transistor VT3 and the other end of transformer T secondary.

Operation principle: capacitor C 1-C4 forms bridge detection circuit; And insert in the 220V electric main; Because the capacitance of four brachium pontis equates that so need only sheet metal A, 2 above earth potentials maintenances of B balance, the diode bridge rectifier that diode VD1-VD4 forms does not just have signal of telecommunication output.When human body during near sheet metal A or B, the capacitor C x that forms between human body and sheet metal A or the B is parallel on the condenser type brachium pontis, makes it disequilibrium; Diode bridge rectifier has the input of interchange, then exports a direct current signal, and this signal code injects the base stage of transistor VT1; After VT2, VT3 amplify; The drive relay K is moved, and utilizes the circuit of the contact control needs control of this relay, reaches near switching purposes.

Claims (4)

1. near switch; It is characterized in that forming by the electric capacity bridge detection circuit that is connected, diode bridge rectifier and switch amplifying circuit; The electric capacity bridge detection circuit is made up of capacitor C 1-C4; Diode bridge rectifier is made up of diode VD1-VD4, and the switch amplifying circuit is made up of transistor VT1-VT3, voltage stabilizing didoe VD5, capacitor C 5 and relay K; The input of electric capacity bridge detection circuit links to each other with the 220V civil power, and its output links to each other with the input of diode bridge rectifier, and the output of diode bridge rectifier links to each other with the switch amplifying circuit; The two ends of described diode bridge rectifier input also connect respectively sheet metal A and sheet metal B are set.
2. according to claim 1 near switch; It is characterized in that capacitor C 1 one ends of described electric capacity bridge detection circuit and an end of capacitor C 2 are connected 220V electric main one end respectively; The other end of capacitor C 1 other end and capacitor C 2 is connected an end of capacitor C 3 and an end of capacitor C 4 respectively, and the other end of capacitor C 3 and the other end of capacitor C 4 are connected the other end of 220V electric main respectively; The input of described switch amplifying circuit connects the output of diode bridge rectifier; The input of diode bridge rectifier is connected between capacitor C 1 and the capacitor C 3, between capacitor C 2 and the capacitor C 4; One end of diode bridge rectifier output connects the base stage of transistor VT1; The other end of diode bridge rectifier output connects the emitter of transistor VT1; The collector electrode of transistor VT1 connects the base stage of transistor VT2, and the emitter of transistor VT2 connects the base stage of transistor VT3, and the emitter of transistor VT3 connects the emitter of transistor VT1; Coil one end of the collector connection relay K of transistor VT3; The collector electrode of transistor VT2 connects the coil other end of relay K, the negative pole of voltage stabilizing didoe VD5 and the positive pole of capacitor C 5 respectively, and the positive pole of voltage stabilizing didoe VD5 connects transformer T secondary one end, and the negative pole of capacitor C 5 connects the emitter of transistor VT3 and the other end of transformer T secondary.
3. according to claim 1 and 2 near switch, it is characterized in that described transistor VT1 adopts 3DG6, transistor VT2 adopts 3DG14, and transistor VT3 adopts 3DG12.
4. according to claim 1 and 2 near switch, it is characterized in that described capacitor C 1-C4 is 100p.
CN2011103545035A 2011-11-10 2011-11-10 Proximity switch CN102412822A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011103545035A CN102412822A (en) 2011-11-10 2011-11-10 Proximity switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011103545035A CN102412822A (en) 2011-11-10 2011-11-10 Proximity switch

Publications (1)

Publication Number Publication Date
CN102412822A true CN102412822A (en) 2012-04-11

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Family Applications (1)

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CN2011103545035A CN102412822A (en) 2011-11-10 2011-11-10 Proximity switch

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CN (1) CN102412822A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104283565A (en) * 2013-06-24 2015-01-14 硅实验室股份有限公司 Capacitance to Digital Converter and Method
CN104577977A (en) * 2014-12-26 2015-04-29 余姚市嘉荣电子电器有限公司 Voltage and current switchable type electric leakage protection device
CN107085403A (en) * 2017-05-19 2017-08-22 蓝思科技(长沙)有限公司 Anticollision circuit and system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2088270U (en) * 1990-12-31 1991-11-06 许玉琨 Multi-functional omnibearing remote control indoor burglar alarm
CN2419737Y (en) * 2000-03-21 2001-02-14 陶圣华 Electric power
US20060044051A1 (en) * 2004-08-24 2006-03-02 International Rectifier Corporation Bootstrap diode emulator with dynamic back-gate biasing and short-circuit protection
CN201226326Y (en) * 2008-07-11 2009-04-22 洛阳源创电气有限公司 Electronic electromagnetic control apparatus for high voltage vacuum contactor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2088270U (en) * 1990-12-31 1991-11-06 许玉琨 Multi-functional omnibearing remote control indoor burglar alarm
CN2419737Y (en) * 2000-03-21 2001-02-14 陶圣华 Electric power
US20060044051A1 (en) * 2004-08-24 2006-03-02 International Rectifier Corporation Bootstrap diode emulator with dynamic back-gate biasing and short-circuit protection
CN201226326Y (en) * 2008-07-11 2009-04-22 洛阳源创电气有限公司 Electronic electromagnetic control apparatus for high voltage vacuum contactor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104283565A (en) * 2013-06-24 2015-01-14 硅实验室股份有限公司 Capacitance to Digital Converter and Method
CN104577977A (en) * 2014-12-26 2015-04-29 余姚市嘉荣电子电器有限公司 Voltage and current switchable type electric leakage protection device
CN107085403A (en) * 2017-05-19 2017-08-22 蓝思科技(长沙)有限公司 Anticollision circuit and system
CN107085403B (en) * 2017-05-19 2019-09-13 蓝思科技(长沙)有限公司 Anticollision circuit and system

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Application publication date: 20120411