CN203632635U - Magnetic limit switch - Google Patents
Magnetic limit switch Download PDFInfo
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- CN203632635U CN203632635U CN201320878855.5U CN201320878855U CN203632635U CN 203632635 U CN203632635 U CN 203632635U CN 201320878855 U CN201320878855 U CN 201320878855U CN 203632635 U CN203632635 U CN 203632635U
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- Prior art keywords
- tongue tube
- limit switch
- magnetic limit
- power input
- magnetic
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- 150000001875 compounds Chemical class 0.000 claims description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000002131 composite material Substances 0.000 abstract 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 235000014676 Phragmites communis Nutrition 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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Abstract
Provided is a magnetic limit switch. A normally-open tongue tube is installed on a PCB (printed circuit board). One end of the tongue tube is connected to a power input end via a bias resistor, and other end of the tongue tube is connected to a load output end. A composite triode module is also connected between the power input end and the load output end. An emission electrode of a first transistor is directly coupled to a base electrode of a second transistor, and a base electrode of the first transistor is connected between the bias resistor and the tongue tube. The magnetic limit switch is opposite to the tongue tune in terms of performance characteristics. As driving current does not flow in the tongue tube, the magnetic limit switch can directly utilize the composite triode module to drive a large-power load while the tongue tube is free from influence of backward electromotive force of a relay. Thus, the magnetic limit switch is more safe and reliable in usage, and the service life of the tongue tube is greatly prolonged.
Description
Technical field
The present invention relates to field of switches, relate in particular to a kind of magnetic limit switch.
Background technology
Magnetic switch is because it is easy to install and regulate, at present spacing all to have applied magnetic switch spacing for a lot of door machine switch gates, such as China Patent No.: 201220199341 disclosed magnet controlled limit switches, according to the operation principle of its description, wherein magnetic switch used is traditional to be encapsulated and the magnetic switch made by single tongue tube, under magnetic fields, make the conversion of normally-open normally-close signal, magnetic switch operating characteristics is consistent with tongue tube operating characteristics used in magnetic switch, and in these patent application, magnetic switch is only for the collection of signal, not for directly controlling the driving of motor, be that limit signal and motor drive signal depart from, this type of drive is also unreliable comparatively speaking, if directly drive load with this normally closed magnetic switch, thereby the restriction that can be limited to reed switch contact is easy to cause the long-term super-high-current damage of tongue tube contact, affect tongue tube useful life, in door lifter, be used for driving also easy too high damage of inverse electromotive force because of relay adhesive disconnection of relay.
Utility model content
The utility model is in order to solve prior art problem, designs a kind ofly can improve the tongue tube magnetic limit switch in useful life.
The technical solution of the utility model is: a kind of magnetic limit switch, the tongue tube of open type is installed on PCB circuit board, and one end of tongue tube is connected on power input by biasing resistor, and the other end is connected on load output; Between power input and load output, be also connected to compound transistor module, compound transistor is that two transistors are connected together, wherein first transistorized emitter is directly coupled to second transistorized base stage, and first transistorized base stage is connected between bigoted resistance and tongue tube.
Preferred as one, compound transistor circuit is NPN type or positive-negative-positive Darlington triode.
Preferred as one, power input is also connected to voltage stabilizing circuit.
Preferred as one, tongue tube is also serially connected with indicator light.
Preferred as one, the input of compound transistor circuit or output are also serially connected with indicator light.
In sum, the beneficial effects of the utility model are:
This magnetic limit switch operating characteristics is contrary with tongue tube operating characteristics used in switch, due to drive current do not flow through tongue tube therefore this magnetic limit switch can be directly used in driving high power load, and tongue tube is not affected by relay inverse electromotive force, therefore safer reliable in the time of the spacing use of door lifter switch gate, greatly extend the useful life of tongue tube, often to open tongue tube due to what use in this normally closed magnetic limit switch in addition, also reduce the cost of magnetic switch, thereby realized Technological Economy optimization.
Accompanying drawing explanation
Fig. 1 is a kind of embodiment circuit diagram of the present utility model.
Embodiment
As shown in Figure 1, a kind of circuit diagram of magnetic limit switch, tongue tube on the pcb board of magnetic limit switch is a tongue tube of often opening 4, one end of tongue tube 4 is by biasing resistor 3(R1) be connected on power input 1 (VCC) after step-down, in order further to guarantee the stability of operating voltage, also on power input VCC, be connected to voltage stabilizing circuit 7 in the present embodiment.Tongue tube 4 other ends are connected on load output 2 (LOAD); Between power input 1 and load output 2, be also connected to compound transistor module, compound transistor is that two transistors connect together, wherein first transistor is NPN type triode 5(Q1), its emitter is directly coupled to second transistorized base stage, and second transistor is positive-negative-positive triode 6(Q2).NPN type triode 5(Q1) base stage be connected between biasing resistor 3 and tongue tube 4.This compound transistor is to form NPN type Darlington triode, and its multiplication factor is NPN type triode 5(Q1) multiplication factor β 1* positive-negative-positive triode 6(Q2) multiplication factor β 2, except the present embodiment, can also be positive-negative-positive Darlington triode.Darlington triode is made up of two triodes conventionally, and these two triodes can be same models, can be also different models; Can be equal-wattage, can be also different capacity.Be connected in any case, the multiplication factor of last formed Darlington triode is all the two multiplication factor product.When normality, tongue tube 4 is off-state, power input 1 (VCC) is by the biasing resistor 3(R1 of transistor base) provide base current IB to compound transistor, now magnetic limit switch drives load by compound transistor, can drive the maximum current IL=β 1* β 2* IB of load, in conjunction with load parameter again by NPN type triode 5(Q1) and positive-negative-positive triode 6(Q2) suitable type selecting and choose reasonable biasing resistor 3(R1) parameter can realize magnetic limit switch and drive and control door lifter operation, and tongue tube 4 is all the time in off-state, in tongue tube 4, flow through without large electric current, improve the useful life of tongue tube 4.
In the time that door machine moves to the spacing position of switch gate, tongue tube 4 is responded to by the magnet ring on door lifter screw, its state from often open become normally closed, now compound transistor base stage and emitter are by tongue tube 4 short circuits, biasing resistor 3(R1) cannot provide base current for compound transistor, now biasing resistor 3(R1) with the load dividing potential drop of directly connecting, choose reasonable biasing resistor 3(R1) parameter make its dividing potential drop considerably beyond load dividing potential drop, now load is not worked, and motor is out of service.
In embodiment: tongue tube is also serially connected with indicator light 8, for the situation that represents that reed switch conduction still disconnects, for effectively representing switch working state, be convenient to the judgement of equipment working condition.Except diagram, input or the output of compound transistor circuit also can be serially connected with indicator light.
More than show and described basic principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; under the prerequisite that does not depart from the utility model spirit and scope, the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (5)
1. a magnetic limit switch, on PCB circuit board, tongue tube is installed, it is characterized in that: described tongue tube is open type, one end is connected on power input by biasing resistor, the other end is connected on load output, between described power input and load output, be also connected to compound transistor module, described compound transistor is that two transistors are connected together, wherein first transistorized emitter is directly coupled to second transistorized base stage, and first described transistorized base stage is connected between described bigoted resistance and tongue tube.
2. magnetic limit switch according to claim 1, is characterized in that: described compound transistor circuit is NPN type or positive-negative-positive Darlington triode.
3. magnetic limit switch according to claim 1, is characterized in that: described power input is also connected to voltage stabilizing circuit.
4. magnetic limit switch according to claim 1, is characterized in that: described tongue tube is also serially connected with indicator light.
5. magnetic limit switch according to claim 1 and 2, is characterized in that: input or the output of described compound transistor circuit are also serially connected with indicator light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320878855.5U CN203632635U (en) | 2013-12-30 | 2013-12-30 | Magnetic limit switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320878855.5U CN203632635U (en) | 2013-12-30 | 2013-12-30 | Magnetic limit switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203632635U true CN203632635U (en) | 2014-06-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320878855.5U Expired - Lifetime CN203632635U (en) | 2013-12-30 | 2013-12-30 | Magnetic limit switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203632635U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106330150A (en) * | 2016-11-09 | 2017-01-11 | 武汉烽火众智数字技术有限责任公司 | Magnetic switch circuit based on reed pipe |
| CN108390667A (en) * | 2018-04-30 | 2018-08-10 | 魏展生 | A kind of indicating circuit of light-operated automatic conversion Push And Release |
-
2013
- 2013-12-30 CN CN201320878855.5U patent/CN203632635U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106330150A (en) * | 2016-11-09 | 2017-01-11 | 武汉烽火众智数字技术有限责任公司 | Magnetic switch circuit based on reed pipe |
| CN106330150B (en) * | 2016-11-09 | 2019-05-17 | 武汉烽火众智数字技术有限责任公司 | A kind of magnetic switch circuit based on tongue tube |
| CN108390667A (en) * | 2018-04-30 | 2018-08-10 | 魏展生 | A kind of indicating circuit of light-operated automatic conversion Push And Release |
| CN108390667B (en) * | 2018-04-30 | 2024-06-04 | 魏展生 | Indicating circuit for light-operated automatic switching on/off |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201214 Address after: Room 106, building 4, No. 8, Shengli Road, Yuhang street, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Sanfu Technology Co.,Ltd. Address before: 311121, 8, holy Road, Shen Shen shop, Yuhang Town, Zhejiang, Hangzhou Patentee before: Sanford Tools Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140604 |