CN87201926U - Metal induction electronic switch - Google Patents
Metal induction electronic switch Download PDFInfo
- Publication number
- CN87201926U CN87201926U CN 87201926 CN87201926U CN87201926U CN 87201926 U CN87201926 U CN 87201926U CN 87201926 CN87201926 CN 87201926 CN 87201926 U CN87201926 U CN 87201926U CN 87201926 U CN87201926 U CN 87201926U
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- China
- Prior art keywords
- electronic switch
- positive
- output
- metal induction
- negative
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Abstract
The utility model relates to an electronic switch, particularly an electronic switch of metal induction, used for an electric control system. The utility model is composed of an induction surface [1], magnetic core inductance [2], a control circuit [3], a casing [4], a potentiometer [6], a displaying luminous tube [5], etc. A PNP type triode (or a PNP type GTR tube) is used as a switch tube. Two output ends used for controlling signal are adopted in the utility model. The two output signals are opposite all the time. The pull electric current is output when the high-electric-level is output. The utility model has an overload and a short-circuit protection devices and is suitable for the need of various control systems.
Description
The utility model relates to a kind of electronic switch, especially for the metal induction electronic switch of electric-control system.
At present, a kind of its stable performance of electronic proximity switch of being produced of in China's introducing equipment electric-control system, using by West Germany " ifmelectronic gerate gmbth+cokg ", but distance of reaction can not be adjusted, and overload capacity is poor, when the output short circuit, switch pole is fragile; Non-adjustable by " electronic proximity switch " its distance of reaction that Dongtou County, Jiangsu sea light machinery plant produces, and owing to be negative polarity output, inconvenience is directly with common electronic circuit OR circuit load.Its description of product is emphaticallyed point out: DK(is an electronic switch) do not allow under the load that surpasses regulation, to work, that is the short circuit of moment I guess, also is unallowed.
The purpose of this utility model is, enlarges the range of application of electronic proximity switch, improves useful life, provide a kind of can be directly with multiple load (particularly ordinary electronic circuit and gate circuit load) and there is the metal of overload and short-circuit protection to respond to electronic switch.
Technical solution of the present utility model is, form metal induction electronic switch by sensitive surface (1), magnetic core inductance (2), control circuit (3), shell (4), demonstration luminous tube (5), potentiometer (6), lead-in wire (7), it is characterized in that control circuit (3) has two control signal output ends, 01,02,01 and 02 is anti-phase each other, and when wherein an end was high level, electric current was drawn in output.Overload and short-circuit protection are arranged.Potentiometer (6) assurance distance of reaction can be regulated.
Advantage of the present utility model is, stable and reliable for performance, can connect with multiple load, if can direct charged resistive load, inductive load and electronic circuit, logic gates and computer interface circuits etc., its long service life, particularly not fragile when occurring in overload or short-circuit conditions, this advantage makes it can satisfy various electric control system needs.
Fig. 1, structural representation of the present utility model
Fig. 2, control circuit block diagram of the present utility model
Fig. 3, control circuit schematic diagram of the present utility model
In conjunction with the accompanying drawings, embodiment of the present utility model is described:
Fig. 1, by sensitive surface (1), magnetic core inductance (2), control circuit (3), shell (4), show that the metal that luminous tube (5), potentiometer (6) and lead (7) are formed responds to electronic switch, its profile is cylindrical or cuboid, also can make other shape according to installation requirement.Lead (7) is a quad, is respectively, and power positive cathode lead-in wire and two barss are controlled 0102 output lead.Potentiometer (6) shows that luminous tube (5) is contained on the shell (4).Magnetic core inductance (2) and control circuit (3) are contained in the shell (4), and fill with insulating polymeric material, with guarantee Switch main body can waterproof, grease proofing, acid-proof, alkali prevention, shockproof, resistance to compression.
Fig. 2, control circuit (3) detect compositions such as monostable flipflop by capacitance connecting three point type oscillator, amplitude adjusting, detection amplification, shaping amplification, electronic switch, output current.Frequency of oscillation is 50KHZ～300KHZ, and oscillation amplitude is 3～5V(P-P value).Output current detection and monostable flipflop constitute the overload or short-circuit protection circuit of control circuit (3).(near distance is that the inductance value of 2～7cm) magnetic core inductance is weakened, and the oscillation amplitude of capacitance connecting three point type oscillator weakens or failure of oscillation as metal object during near sensitive surface.After metal object was left, oscillator recovered vibration.Oscillator signal amplifies through detection, becomes dc controling level, amplifies through shaping again, promotes electronic switch output control signal 01.01 exports another road control signal 02 through the paraphase electronic switch.
Fig. 3, T1, R1, R2, R3, C1, C2, C3, L constitute capacitance connecting three point type oscillator, adjust the resistance of R3, and it is strong and weak to change vibration.Also just can control the sensitivity of metal object to the influence of oscillator.Obtain optimum sensitivity, the resistance of R3 should be chosen in (R3 is potentiometer (6)) between 0～2K Ω.
T2, R5, R6, C4, C5 etc. constitute the detection and the amplifying circuit of oscillator signal.Oscillator signal is become the needed dc control signal of switching circuit.R14, R15, R16, R17, T5, T6 constitute Schmidt's shaping amplification circuit, and control signal is amplified through shaping, promptly shows luminous tube (5) by D9() promotion electronic switch T7 output.This road control signal 01 is normal " 0 " switching signal.Control signal is delivered to the paraphase electronic switch of being made up of R21, R22, R23, R24, T8, T9, T10 through R19 simultaneously.This road control signal 02 is normal " 1 " switch controlling signal.Fly-wheel diode when D4, D5 are inductive load.
R18, R25 detect resistance for the electronic switch output current, and when output current surpassed set point, the pressure drop on R18 or the R25 was risen.Make the T11 saturation conduction through C9 and R13, the T3 saturation conduction, C8 discharges rapidly to T3, the T4 saturation conduction.The signal of T4 collector electrode makes T5, T8 saturation conduction respectively through D2, D3, and T6, T4 end respectively, and T7, T11 also end.Output current is zero, thereby has protected electronic switch.Pressure drop on R18, the R25 is zero by also reducing to T7, T10's.At this moment T11 ends, and T3 ends, and T4 is tied through e-b by power supply, and R10, C7 are to the slow charging of C8 and keep conducting state.Thereby the cut-off state of T7, T10 can not remove at once, and along with increasing of C8 both end voltage, T4 withdraws from saturated gradually, enters magnifying state, and when the T4 collector potential is not enough to keep T5, during the T8 saturation conduction, overload and short-circuit protection are just lifted a blockade.If overload this moment or short-circuit condition are eliminated, switching circuit just can recover normal operating conditions.If this moment, overload or short-circuit condition are not eliminated as yet, and then circuit will be constantly from multiple above process, till fault is eliminated.C6, C7, C9 are speed-up capacitor.D1, D2, D3 are isolating diode.
The protective circuit instantaneous operation time is 20 μ s, and recovering time-delay is 2～4 seconds, and " " duty ratio " is about 10 for it
-5Thereby, guaranteed that effectively switching tube can not damage because of load short circuits.Change the resistance of R18, R25, value that can the selector switch output current.R18, R25 generally select between 10 Ω～0.2 Ω, and its power can be chosen by following formula.
W
R＞ 0.49/(R（Ω）) （W）。
For the output signal (promptly when being output as high level, switch can be sent and draw current signal) that obtains positive polarity.Switch transistor T 7, T10 select power tube or high power valve in the positive-negative-positive for use, for reducing to promote power, preferably select the positive-negative-positive Darlington transistor for use.The supply voltage of switch is direct current 70V～12V.
The utility model can become tee if remove elements such as T8, T9, T10.
Profile of the present utility model can be the cylinder shown in the figure (1), also can make other multiple shape according to actual needs.
Claims (4)
1; a kind of metal induction electronic switch; sensitive surface [1] is arranged; magnetic core inductance [2]; control circuit [3]; shell [4]; lead-in wire [7]; it is characterized in that; the potentiometer [6] that can regulate distance of reaction is arranged on the shell [4]; demonstration luminous tube [5] is arranged; control circuit [3] is by capacitance connecting three point type oscillator; amplitude is regulated; detection is amplified; shaping is amplified; electronic switch; output current detects; monostable trigger is formed; its frequency of oscillation 50KHz～300KHz; oscillation amplitude 3～5V (P-P value); it is as switching tube with positive-negative-positive triode (or positive-negative-positive Darlington transistor); overload and load short circuits protective device are arranged; there is output current to detect resistance; there are two control signal output ends 01,02,01 and 02 anti-phase each other; when output signal was high level, electric current was drawn in output.
2, metal induction electronic switch according to claim 1 is characterized in that the resistance of potentiometer (6) should be between 0～2K Ω.
3, metal induction electronic switch according to claim 1 is characterized in that, positive-negative-positive triode (or positive-negative-positive Darlington transistor) is middle power or high power valve.
4, metal induction electronic switch according to claim 1 is characterized in that export the emitter that electric current sense resistor is connected on the output switching tube, its resistance is at 0.2～10(Ω) between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87201926 CN87201926U (en) | 1987-02-11 | 1987-02-11 | Metal induction electronic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87201926 CN87201926U (en) | 1987-02-11 | 1987-02-11 | Metal induction electronic switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87201926U true CN87201926U (en) | 1988-03-23 |
Family
ID=4818164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87201926 Ceased CN87201926U (en) | 1987-02-11 | 1987-02-11 | Metal induction electronic switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87201926U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968551A (en) * | 2010-08-26 | 2011-02-09 | 刘家发 | Portable metal detecting device |
| CN102096109A (en) * | 2010-11-10 | 2011-06-15 | 刘昭利 | Inductance type metal approach detecting probe |
| CN103427816A (en) * | 2012-05-18 | 2013-12-04 | 上海梅山钢铁股份有限公司 | Proximity switch with fault detection function |
| CN106099835A (en) * | 2016-06-12 | 2016-11-09 | 安徽我要遛遛信息技术有限公司 | One wire system band overload, short-circuit protection electrical switch |
| CN111600587A (en) * | 2020-04-23 | 2020-08-28 | 眉山市宇泰电子设备有限公司 | Sensor system for inductive proximity switch |
-
1987
- 1987-02-11 CN CN 87201926 patent/CN87201926U/en not_active Ceased
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968551A (en) * | 2010-08-26 | 2011-02-09 | 刘家发 | Portable metal detecting device |
| CN102096109A (en) * | 2010-11-10 | 2011-06-15 | 刘昭利 | Inductance type metal approach detecting probe |
| CN103427816A (en) * | 2012-05-18 | 2013-12-04 | 上海梅山钢铁股份有限公司 | Proximity switch with fault detection function |
| CN103427816B (en) * | 2012-05-18 | 2016-06-01 | 上海梅山钢铁股份有限公司 | A kind of proximity switch with fault detection capability |
| CN106099835A (en) * | 2016-06-12 | 2016-11-09 | 安徽我要遛遛信息技术有限公司 | One wire system band overload, short-circuit protection electrical switch |
| CN111600587A (en) * | 2020-04-23 | 2020-08-28 | 眉山市宇泰电子设备有限公司 | Sensor system for inductive proximity switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right |