CN1224227A - Relay type long service life approach switch - Google Patents
Relay type long service life approach switch Download PDFInfo
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- CN1224227A CN1224227A CN 98110991 CN98110991A CN1224227A CN 1224227 A CN1224227 A CN 1224227A CN 98110991 CN98110991 CN 98110991 CN 98110991 A CN98110991 A CN 98110991A CN 1224227 A CN1224227 A CN 1224227A
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- relay
- voltage stabilizing
- service life
- long service
- type long
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Abstract
A relay-type proximity switch having long service life features that the voltage stabilizer and power amplifier are arranged between relay and proximity switch. The intput of power amplifier is connected to the proximity switch as switching signal picking-up part and its output to the coil of relay. The contact pair of relay is connected with load circuit. Its advantage is that a stable and low current always flows through relay coil, so elongating its service life greatly.
Description
The present invention relates to a kind ofly near switch, particularly a kind of long-life is near switch.
Generally be used as travel switch near switch, mainly contain magnetic induction in reed pipe formula and Hall element formula, the former shortcoming mainly is to open between the contact apart from too small, thereby the voltage that adds thereon can not be too high, otherwise very easily puncture, especially be operated in the bigger circuit of disturbing pulse, the contact puncture can cause misoperation; On the other hand, be subjected to the restriction of contact volume and elasticity of spring leaf intensity, the electric current that permission is passed through can not be done very greatly, otherwise can influence its working life and reliable in action, tend to make contact " sintering " or blow and scrap if overload or short circuit (this often runs in actual use) take place; The latter's shortcoming mainly is: withstand voltage not high enough, output current is less, and overload is damaged easily; In sum, existing shorter mostly near switch life, and can only be used for the light current field.
Purpose of the present invention with regard to be to provide at above-mentioned prior art present situation a kind of life-span long, the strong and weak electricity field is general near switch.
The object of the present invention is achieved like this: relay type long service life approach switch comprises relay J, near switch element and voltage stabilizing thereof, power amplifier, the input termination of power amplifier as the switching signal pickup device near switch element, the coil of output relay termination J, the contact of relay J is to then being connected on the load circuit.
Compared with prior art, the present invention adopts relay as final switch executing element, and only flow through stable weak current all the time as the switching signal pickup device near switch element, thereby prolonged its useful life greatly, and also the strong and weak electricity field all can be used.
Description of drawings:
Fig. 1 is the circuit theory diagrams of the embodiment of the invention one.
Fig. 2 is the circuit theory diagrams of the embodiment of the invention two.
Fig. 3 is the circuit theory diagrams of the embodiment of the invention three.
Fig. 4 is the circuit theory diagrams of the embodiment of the invention four.
Fig. 5 is the circuit theory diagrams of the embodiment of the invention five.
Fig. 6 is the circuit theory diagrams of the embodiment of the invention six.
Fig. 7 is the circuit theory diagrams of the embodiment of the invention seven.
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing.
Be straight flow near switch as Fig. 1～embodiment shown in Figure 4, what promptly the load circuit of being controlled was used is DC power supply.
As shown in Figure 1, adopt magnetic inductive tongue tube H as the approach signal pickup device, voltage stabilizing didoe D1, the both positive and negative polarity of capacitor C 1 back in parallel series resistance R2 tap power supply, constitute voltage stabilizing circuit, the end of tongue tube H meets R2 through current-limiting resistance R1, C1, the common contact of D1, the base stage of another termination triode BG, the collector electrode of BG connects positive source through the coil of relay J, the emitter of BG connects power cathode, the contact of relay J then is serially connected in the load circuit, load circuit can be as shown to be Rz1, the Rz2 two-way is switched by relay J, also can have only wherein one the tunnel;
Cause switch not work even to damage on the contrary for preventing that power supply connects when the practical application, can between the emitter of triode BG and power cathode, be connected in series a diode D3;
For the inverse peak voltage that prevents relay J produces harmful effect to circuit, can and meet a diode D2 at relay J coil two ends, wherein the negative electrode of D2 connects positive source.
Triode BG in above-mentioned be used for amplifying signal, drive the relay J action, thereby available field effect transistor BG ' with same function substitutes, shown in Figure 2ly be a such embodiment, the grid of field effect transistor BG ' meets tongue tube H, the drain electrode of BG ' is through the coil of relay J, and the source electrode of BG ' connects power cathode; Because must be between the grid of field effect transistor and the source electrode by stable voltage ability steady operation, also puncture in order to prevent the overtension between grid, the source electrode, a voltage stabilizing didoe D4 in parallel between the grid that is preferably in field effect transistor BG ' and the source electrode, for obtaining grid voltage more stably, also can a filter capacitor C2 in parallel, being more suitable for Voltage pulsating direct-current supply, thereby guarantee BG ' steady operation; If power supply is relatively stable in the practical application, owing to voltage stabilizing circuit arranged, thereby also direct Dai Yiyi resistance of above-mentioned voltage stabilizing didoe D4 and filter capacitor C2.
Tongue tube H among above-mentioned two embodiment is an approach signal pickup device, thereby availablely have equal Hall element H ' and substitute, shown in Figure 3ly be a such embodiment, because Hall element itself has the certain power amplification, thereby the both positive and negative polarity of Hall element H ' directly connects power positive cathode among the figure, and its output is directly succeeded the coil of electrical equipment J.
Because Hall element itself has certain pressure stabilization function, thereby the voltage stabilizing circuit that is made of resistance R 2, voltage stabilizing didoe D1 and capacitor C 1 in the foregoing description can omit, and as shown in Figure 4, is a such embodiment.
If the load of controlling near switch is connected in the ac circuit, then need to set up rectification, filter circuit near the control circuit front end of switch in above-mentioned straight flow, isolating the AC load loop, the AC system that is corresponding diagram 1～Fig. 3 embodiment respectively as Fig. 5～shown in Figure 7 is near switch: AC power behind capacitor C 3 step-downs, diode D5～D8 bridge rectifier as the DC power supply of control circuit.Because power positive cathode is definite after rectification, thereby in Fig. 1～Fig. 3,, can omit anti-power supply for meeting the diode D3 that is provided with on the contrary.
Resistance R 2 among Fig. 1, Fig. 2, Fig. 5, Fig. 6 is positioned at after the relay J, thereby only triode BG, triode BG ' are powered by the voltage stabilizing circuit that voltage stabilizing didoe D1, capacitor C 1 and resistance R 2 constitute, relay J is then directly powered by power supply, if but power is enough, resistance R 2 also can be positioned at before the relay J, as Fig. 3, shown in Figure 7, relay J is also powered by voltage stabilizing circuit; In addition, as Fig. 5 to AC load embodiment shown in Figure 7 because the front end step-down of existing capacitor C 3, thereby the resistance R in the voltage stabilizing circuit 2 is omitted and also can.
Claims (15)
1. relay type long service life approach switch, comprise relay J, near switch element, the contact of relay J is docked on the load circuit, it is characterized in that at described voltage stabilizing, the power amplifier of being provided with in relay J and between near switch element, the input termination of power amplifier as the switching signal pickup device near switch element, the coil of output relay termination J.
2. relay type long service life approach switch as claimed in claim 1 is characterized in that:
A. the contact of described relay J is docked on the DC load loop;
B. described near switch element employing magnetic inductive tongue tube H;
C. described voltage stabilizing circuit is made of the both positive and negative polarity of voltage stabilizing didoe D1, capacitor C 1 back in parallel series resistance R2 tap power supply.
D. described power amplifier adopts triode BG, and the end of tongue tube H connects positive source through current-limiting resistance R1, the base stage of another termination triode BG, and the collector electrode of BG connects positive source through the coil of relay J, and the emitter of BG connects power cathode.
3. relay type long service life approach switch as claimed in claim 2 is characterized in that also being serially connected with a diode D3 between the emitter of described triode BG and the power cathode.
4. relay type long service life approach switch as claimed in claim 1 is characterized in that:
A. described relay J contact is docked on the AC load loop;
B. described near switch element employing magnetic inductive tongue tube H;
C. AC power behind capacitor C 3 step-downs, diode D5～D8 bridge rectifier as DC power supply;
D. described voltage stabilizing circuit is made of the voltage stabilizing didoe D1 that is connected in parallel on the DC power supply positive and negative end, capacitor C 1;
E. described power amplifier adopts triode BG, and the end of tongue tube H connects positive source through current-limiting resistance R1, the base stage of another termination triode BG, and the collector electrode of BG connects positive source through the coil of relay J, and the emitter of BG connects power cathode.
5. relay type long service life approach switch as claimed in claim 1 is characterized in that:
A. the contact of described relay J is docked on the DC load loop;
B. described near switch element employing magnetic inductive tongue tube H;
C. described voltage stabilizing circuit is made of the both positive and negative polarity of voltage stabilizing didoe D1, capacitor C 1 back in parallel series resistance R2 tap power supply.
D. described power amplifier adopts field effect transistor BG ', and the end of tongue tube H connects positive source through current-limiting resistance R1, the grid of another termination field effect transistor BG ', and the drain electrode of BG ' connects positive source through the coil of relay J, and the source electrode of BG ' connects power cathode., be parallel with voltage stabilizing didoe D4 between the grid of BG ' and the source electrode.
6. relay type long service life approach switch as claimed in claim 5 is characterized in that: be parallel with voltage stabilizing didoe D4 between the grid of described field effect transistor BG ' and source electrode.
7. relay type long service life approach switch as claimed in claim 6 is characterized in that being parallel with filter capacitor C2 between the grid of field effect transistor BG ' and source electrode.
8. as claim 6 or 7 described relay type long service life approach switch, it is characterized in that also being serially connected with a diode D3 between the source electrode of described field effect transistor BG ' and the power cathode.
9. relay type long service life approach switch as claimed in claim 1 is characterized in that:
A. the contact of described relay J is docked on the AC load loop;
B. described near switch element employing magnetic inductive tongue tube H;
C. AC power behind capacitor C 3 step-downs, diode D5～D8 bridge rectifier as DC power supply;
D. described voltage stabilizing circuit is made of the voltage stabilizing didoe D1 that is connected in parallel on the DC power supply positive and negative end, capacitor C 1;
E. described power amplifier adopts field effect transistor BG ', the end of tongue tube H connects positive source through current-limiting resistance R1, the grid of another termination field effect transistor BG ', the drain electrode of BG ' connects positive source through the coil of relay J, the source electrode of BG ' connects power cathode, is parallel with voltage stabilizing didoe D4 between the grid of BG ' and the source electrode.
10. relay type long service life approach switch as claimed in claim 9 is characterized in that being parallel with filter capacitor C2 between the grid of field effect transistor BG ' and source electrode.
11. relay type long service life approach switch as claimed in claim 1 is characterized in that:
A. the contact of described relay J is docked on the DC load loop;
B. describedly rolled into one by Hall element H ' near switch element, voltage stabilizing circuit, power amplifier, the both positive and negative polarity of Hall element H ' directly connects power positive cathode respectively, and its output is directly succeeded the coil of electrical equipment J.
12. relay type long service life approach switch as claimed in claim 11 is characterized in that described voltage stabilizing circuit is made of the both positive and negative polarity of voltage stabilizing didoe D1, capacitor C 1 back in parallel series resistance R2 tap power supply.
13. as claim 11 or 12 described relay type long service life approach switch, it is characterized in that described at described Hall element H ' negative pole and power cathode between also be serially connected with a diode D3.
14. relay type long service life approach switch as claimed in claim 1 is characterized in that:
A. the contact of described relay J is docked on the AC load loop;
B. described near switch element employing Hall element H ';
C. AC power behind capacitor C 3 step-downs, diode D5～D8 bridge rectifier as DC power supply.
15. relay type long service life approach switch as claimed in claim 14 is characterized in that described voltage stabilizing circuit is made of the voltage stabilizing didoe D1 that is connected in parallel on the DC power supply positive and negative end, capacitor C 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98110991 CN1094643C (en) | 1998-07-29 | 1998-07-29 | Relay type long service life approach switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98110991 CN1094643C (en) | 1998-07-29 | 1998-07-29 | Relay type long service life approach switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1224227A true CN1224227A (en) | 1999-07-28 |
| CN1094643C CN1094643C (en) | 2002-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98110991 Expired - Fee Related CN1094643C (en) | 1998-07-29 | 1998-07-29 | Relay type long service life approach switch |
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| Country | Link |
|---|---|
| CN (1) | CN1094643C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199837A (en) * | 2013-03-04 | 2013-07-10 | 山东瑞莱堡立体停车设备有限公司 | Magnetic induction passive and contactless multifunctional limit switch device |
| CN105047481A (en) * | 2015-05-18 | 2015-11-11 | 厦门宏发汽车电子有限公司 | Twin-coil magnetic latching relay used for suppressing coil peak inverse voltages and suppressing method thereof |
| CN109307840A (en) * | 2018-12-10 | 2019-02-05 | 中国铁道科学研究院集团有限公司标准计量研究所 | A kind of integration railway signal relay life test apparatus and method |
-
1998
- 1998-07-29 CN CN 98110991 patent/CN1094643C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199837A (en) * | 2013-03-04 | 2013-07-10 | 山东瑞莱堡立体停车设备有限公司 | Magnetic induction passive and contactless multifunctional limit switch device |
| CN105047481A (en) * | 2015-05-18 | 2015-11-11 | 厦门宏发汽车电子有限公司 | Twin-coil magnetic latching relay used for suppressing coil peak inverse voltages and suppressing method thereof |
| CN105047481B (en) * | 2015-05-18 | 2017-07-18 | 厦门宏发汽车电子有限公司 | Twin coil magnetic latching relay and its suppressing method for suppression coil inverse peak voltage |
| CN109307840A (en) * | 2018-12-10 | 2019-02-05 | 中国铁道科学研究院集团有限公司标准计量研究所 | A kind of integration railway signal relay life test apparatus and method |
| CN109307840B (en) * | 2018-12-10 | 2023-09-01 | 中国铁道科学研究院集团有限公司标准计量研究所 | Integrated railway signal relay service life test device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1094643C (en) | 2002-11-20 |
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