CN202978873U - Two-line magnetic-sensing switch - Google Patents
Two-line magnetic-sensing switch Download PDFInfo
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- CN202978873U CN202978873U CN 201220686978 CN201220686978U CN202978873U CN 202978873 U CN202978873 U CN 202978873U CN 201220686978 CN201220686978 CN 201220686978 CN 201220686978 U CN201220686978 U CN 201220686978U CN 202978873 U CN202978873 U CN 202978873U
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- voltage stabilizing
- hall circuit
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Abstract
The utility model discloses a two-line magnetic-sensing switch which comprises a Hall circuit, a voltage stabilizing circuit and an adjusting resistor. A power supply end of the Hall circuit is connected with an output end of the voltage stabilizing circuit, a power supply end of the voltage stabilizing circuit is connected with one end of the adjusting resistor and serves as a positive end of the two-line magnetic-sensing switch, an output end of the Hall circuit is connected with the other end of the adjusting resistor, and a ground end of the Hall circuit serves as a negative end of the two-line magnetic-sensing switch. The two-line magnetic-sensing switch can drive a load only by two lines, and thereby cost and space are saved. The two-line magnetic-sensing electronic switch is free of contacts and jitter, stable in signal and much longer in service life as compared with a reed switch, is a semipermanent working device and can directly replaces the reed switch in certain situations.
Description
Technical field
Whether the utility model relates to a kind of two line magnet-sensitive switchs, and is specifically a kind of based on Hall circuit, can work by control load under two lines spares, and perhaps outer meeting resistance is realized the magnetosensitive non-contact switch circuit of Voltage-output.
Background technology
Utilize moving component directly to control the occasion whether load works at needs, the past connects a tongue tube usually between load and power supply, and utilizes the magnet that is attached on moving component to trigger tongue tube work, and then the break-make of control load power supply.But tongue tube is an element that the contact is arranged, and during work, easily shake the contact, and glass bulb is fragile, and reliability is relatively poor, therefore needs a kind of reliable substitute products to occur.
Summary of the invention
Goal of the invention: the utility model is for the shortcoming of tongue tube, and the magnet-sensitive switch that two lines of a kind of need just can control load work is provided on the basis that keeps tongue tube advantage easy to use.
Technical scheme: in order to solve the problems of the technologies described above, the utility model has adopted following technical scheme:
A kind of two line magnet-sensitive switchs, it is characterized in that, it comprises Hall circuit, voltage stabilizing circuit and adjusting resistance, and the power end of described Hall circuit connects the output of voltage stabilizing circuit, the power end of voltage stabilizing circuit connects an end of adjusting resistance, and as two line magnet-sensitive switch anodes; The output of Hall circuit connects the other end of adjusting resistance; The ground end of Hall circuit is as two line magnet-sensitive switch negative terminals.
Another kind of execution mode, it also comprises pull-up resistor and transistor, wherein the power end of voltage stabilizing circuit connects an end of adjusting resistance, and as two line magnet-sensitive switch anodes; One end of pull-up resistor connects respectively the power end of Hall circuit and the output of voltage stabilizing circuit, and the other end of pull-up resistor connects respectively output and the transistorized base stage of Hall circuit; Transistorized emitter connects the other end of adjusting resistance, and transistorized collector electrode connects the ground end of Hall circuit and as the negative terminal of two line magnet-sensitive switchs.
Beneficial effect: (1) only needs two lines just can drive load, provides cost savings and the space; (2) two line magnetosensitive electronic switches are contactless, non-jitter, and signal stabilization increased greatly with respect to the tongue tube life-span, was a kind of semipermanent device work, and some occasion is the alternative dry reed pipe directly.
Description of drawings
Fig. 1 is the utility model circuit connection diagram.
Fig. 2 is the schematic diagram of the another kind of execution mode of the utility model.
Fig. 3 is application example figure of the present utility model.
Embodiment:
Below in conjunction with accompanying drawing, the utility model is done further and explained.
As shown in Figure 1, two line magnet-sensitive switchs of the present utility model comprise Hall circuit 1, voltage stabilizing circuit 2 and adjusting resistance 3, and the power end of described Hall circuit 1 is connected with the output of voltage stabilizing circuit 2; The power end of voltage stabilizing circuit 2 is connected with an end of adjusting resistance 3, as two line magnet-sensitive switch anodes; The output of Hall circuit 1 is connected with the other end of adjusting resistance 3; The ground end of Hall circuit 1 is as two line magnet-sensitive switch negative terminals.The two line magnet-sensitive switchs that can form a normal operation by above-mentioned method of attachment.
Described Hall circuit 1 is switching mode (or latch-type) Hall circuit commonly used, be used for magnetic signal is converted into switched electrical signal, when magnet near or during away from Hall circuit 1, the efferent duct state of Hall circuit 1 can switch between conducting and cut-off, can pass through large electric current during conducting, pass through hardly electric current during cut-off; Voltage stabilizing circuit 2 is used for stablizing the operating voltage of Hall circuit 1, guarantees that it can work all the time; Adjusting resistance 3 is used for ensureing that anode and the negative terminal of two line magnet-sensitive switchs can short circuits.
must adopt an adjusting resistance 3 in scheme, this is because if there is no adjusting resistance 3, the anode of two line magnet-sensitive switchs directly is connected with the output of Hall circuit 1, and the output stage of Hall switch circuit is an open-collector transistor, when it is in conducting state, its output and ground end conducting, the ground end is two line magnet-sensitive switch negative terminals namely, this is equivalent to two line magnet-sensitive switch anodes and is connected with negative terminal, form short circuit, Hall circuit just can't be worked like this, so the adjusting resistance that generally adopts hundreds of ohm is used for ensureing that Hall circuit has enough operating voltages.
Two line magnet-sensitive switchs have the magnetic characteristic similar to Hall circuit, namely under the effect in magnetic field, two line magnet-sensitive switchs can be changed between conducting and cut-off two states, during conducting, the On current that its electric current that passes through equals the Hall circuit efferent duct adds the static current of lcd (suppose voltage stabilizing circuit power consumption can ignore) of Hall circuit; During cut-off, its electric current that passes through equals the static current of lcd of Hall circuit.Namely, two line magnet-sensitive switchs have the function of magnetic controlled current.Utilize this characteristic, whether two line magnet-sensitive switchs can be used to control load work.For easy to use, Hall circuit, voltage stabilizing circuit and adjusting resistance can be made an integrated circuit modules.
Two line magnet-sensitive switchs " cut-off current " do not equal zero, and in order to reduce " cut-off current " as far as possible, should select the little low-power consumption Hall circuit of static current of lcd.
If need to increase the driving force of two line magnet-sensitive switchs, can increase the one-level current amplification circuit, namely the output at Hall circuit 1 increases a pull-up resistor 4 and a transistor 5.Specifically connection as shown in Figure 2: the power end of voltage stabilizing circuit 2 is connected with an end of adjusting resistance 3, as two line magnet-sensitive switch anodes; One end of pull-up resistor 4 connects the power end of Hall circuit 1 and is connected with the output of voltage stabilizing circuit 2, and the other end of pull-up resistor 4 connects the output of Hall circuit 1 and is connected with the base stage of transistor 5; The emitter of transistor 5 connects the other end of adjusting resistance 3, and the collector electrode of transistor 5 connects the ground end of Hall circuit 1, and as the negative terminal of two line magnet-sensitive switchs, wherein transistor 5 can be selected high power transistor, to increase On current.
Fig. 3 represents the conventional using method of two line magnet-sensitive switchs, the positive termination power Vcc of two line magnet-sensitive switchs 6, and negative terminal connects an end of load 7, the other end ground connection of load 7.The S that uses magnet 8 extremely near or away from two line magnet-sensitive switchs 6, can realize the alternation of load 7.
The below introduces the working condition of two line magnet-sensitive switchs as an example of the AH3621 Hall circuit example:
The AH3621 Hall circuit is a kind of single magnetic pole Hall switch circuit, operating voltage (direct current) 3.5～18V, and static current of lcd is about 4mA.As magnet S extremely when the AH3621, the AH3621 conducting, between output is held with ground, resistance R o is close to 0 Ω; When the magnet S utmost point during away from AH3621, AH3621 cut-off, between output and ground end, impedance Ro greater than 10M Ω, does not almost have electric current to pass through from adjusting resistance 3.If ignore the power consumption of voltage stabilizing circuit, two line magnet-sensitive switch cut-off state static current of lcd Io equal the AH3621 static current of lcd approx so, also 4 milliamperes of left and right.
As Fig. 1, shown in Figure 3, generally, the electric current by two line magnet-sensitive switchs 6 drive current of load 7 (namely by) can be expressed as approx:
I=Io+Vcc/（Ro+Rc+R
L）。
In formula:
I is the electric current by two line magnet-sensitive switchs 6;
Io is two line magnet-sensitive switch 6 cut-off state static current of lcd;
Vcc is supply voltage;
Ro is the resistance between AH3621 output and ground end, during conducting, and Ro ≈ 0, during cut-off, Ro 〉=10M Ω;
Rc is the resistance of adjusting resistance 3;
R
LResistance for load resistance 7.
Suppose that load is relay, and its coil resistance R
L=30 Ω, and establish adjusting resistance Rc=300 Ω, so:
When the magnet S utmost point during away from AH3621, two line magnet-sensitive switchs cut-offs, because of Ro 〉=10M Ω, therefore I ≈ Io=4mA, this undercurrent is to drive relay work;
As magnet S during extremely near AH3621, two line magnet-sensitive switch conductings, I=4mA+Vcc/330 Ω.If Vcc=5V, Io ≈ 19mA; If Vcc=15V, Io ≈ 49mA.This electric current can drive medium and small relay work.
If need larger drive current, can use two line magnet-sensitive switchs as Fig. 2, wherein transistor 5 can be selected high power transistor.
As seen by above-mentioned, two line magnet-sensitive switchs can directly drive class loads such as relay, buzzer, also can be used as current signal and use.
The above is only preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvement, these improvement also should be considered as protection range of the present utility model.
Claims (2)
1. line magnet-sensitive switch, it is characterized in that, it comprises Hall circuit (1), voltage stabilizing circuit (2) and adjusting resistance (3), the power end of described Hall circuit (1) connects the output of voltage stabilizing circuit (2), the power end of voltage stabilizing circuit (2) connects an end of adjusting resistance (3), and as two line magnet-sensitive switch anodes; The output of Hall circuit (1) connects the other end of adjusting resistance (3); The ground end of Hall circuit (1) is as two line magnet-sensitive switch negative terminals.
2. a kind of two line magnet-sensitive switchs according to claim 1, it is characterized in that: it also comprises pull-up resistor (4) and transistor (5), wherein the power end of voltage stabilizing circuit (2) connects an end of adjusting resistance (3), and as two line magnet-sensitive switch anodes; One end of pull-up resistor (4) connects respectively the power end of Hall circuit and the output of voltage stabilizing circuit, and the other end of pull-up resistor (4) connects respectively the base stage of output and the transistor (5) of Hall circuit (1); The emitter of transistor (5) connects the other end of adjusting resistance (3), and the collector electrode of transistor (5) connects the ground end of Hall circuit (1) and as the negative terminal of two line magnet-sensitive switchs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220686978 CN202978873U (en) | 2012-12-13 | 2012-12-13 | Two-line magnetic-sensing switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220686978 CN202978873U (en) | 2012-12-13 | 2012-12-13 | Two-line magnetic-sensing switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202978873U true CN202978873U (en) | 2013-06-05 |
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ID=48519891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220686978 Expired - Fee Related CN202978873U (en) | 2012-12-13 | 2012-12-13 | Two-line magnetic-sensing switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202978873U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296574A (en) * | 2019-07-30 | 2019-10-01 | 长虹美菱股份有限公司 | A kind of opening-closing device for refrigerator door |
-
2012
- 2012-12-13 CN CN 201220686978 patent/CN202978873U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296574A (en) * | 2019-07-30 | 2019-10-01 | 长虹美菱股份有限公司 | A kind of opening-closing device for refrigerator door |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20181213 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |