CN202889316U - Circuit for switch sensor - Google Patents
Circuit for switch sensor Download PDFInfo
- Publication number
- CN202889316U CN202889316U CN 201220548243 CN201220548243U CN202889316U CN 202889316 U CN202889316 U CN 202889316U CN 201220548243 CN201220548243 CN 201220548243 CN 201220548243 U CN201220548243 U CN 201220548243U CN 202889316 U CN202889316 U CN 202889316U
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- current source
- tmr element
- electrically connected
- resistance
- circuit
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Abstract
The utility model discloses a circuit for a switch senor. The circuit comprises a TMR (tunnel magnetoresistance) element (1), a resistor (2), a first current source (3) and a second current source (4), wherein the TMR element (1) is electrically connected with the first current source (3), the resistor (2) is electrically connected with the second current source (2), the TMR element (1) is electrically connected with the resistor (2), the first current source (3) is electrically connected with the second current source (4), and the TMR element (1), the resistor (2), the first current source (3) and the second current source (4) are respectively taken as bridge arms and electrically connected to form an electric bridge; and temperature coefficients of the TMR element (1) and the resistor (2) are mutually matched, the first current source (3) and the second current source (4) are used for providing constant current, the resistor (2) is used for providing a resistance value matched with the TMR element (1), and the TMR element (1) is used for sensing change of an external magnetic field. The circuit is low in power consumption, and when the input voltage of the circuit is 3V, the power consumption of the circuit is less than or equal to 5 microwatts; and the power consumption of the circuit is not influenced by the resistance values of the TMR element and the resistor.
Description
Technical field
The utility model relates to the switch sensor technical field, particularly a kind of circuit for switch sensor.
Background technology
The application of switch sensor in industry is very extensive.In the prior art, the power consumption of the circuit of switch sensor is higher.When the input voltage of switch sensor was 3V, even add dormant circuit in the switch sensor, its power consumption still can't reach below the 3 μ W, and the dormant circuit of adding can make the response speed of the circuit of switch sensor reduce on the contrary.
At present, it is lower and can keep the circuit that is used for switch sensor of certain response speed to be starved of a kind of power consumption.
The utility model content
The purpose of this utility model provides a kind of circuit for switch sensor.
The circuit that is used for switch sensor that the utility model provides comprises TMR element, resistance, the first current source and the second current source, described TMR element is electrically connected with described the first current source, described resistance is electrically connected with described the second current source, described TMR element is electrically connected with described resistance, described the first current source is electrically connected with described the second current source, and described TMR element, described resistance, described the first current source and described the second current source are respectively as the brachium pontis electric bridge that is electrically connected to form;
The temperature coefficient of described TMR element and described resistance mates mutually, described the first current source and described the second current source are used for providing constant electric current, described resistance is used for providing the resistance value of mating with described TMR element, and described TMR element is used for the variation of induction external magnetic field.
Preferably, described TMR element is connected with power supply with node between the described resistance; Node ground connection between described the first current source and described the second current source.
Preferably, the node ground connection between described TMR element and the described resistance; Described the first current source is connected with power supply with node between described the second current source.
Preferably, described circuit also comprises variable gain amplifier and comparator, described TMR element is electrically connected with the input of described variable gain amplifier with node between described the first current source, the output of described variable gain amplifier is electrically connected with the first input end of described comparator, and described resistance is electrically connected with the second input of described comparator with node between described the second current source.
The utlity model has following beneficial effect:
(1) described circuit adopts the current drive-type bridge structure, and it is output as difference output, and therefore the power consumption of described circuit is lower, when the input voltage of described circuit is 3V, is not adding in the situation of dormant circuit, and the power consumption of described circuit is less than or equal to 5 μ W;
(2) the resistance value size of the power consumption of described circuit and TMR element and resistance is without direct relation, and namely the power consumption of described circuit is not subjected to the impact of the resistance value size of TMR element and resistance;
(3) described circuit can realize comprising the bridge structure of single TMR element, so that the manufacture craft of the TMR element that adopts in the described circuit is simplified;
(4) described circuit can be saved the size of its packaging body.
Description of drawings
The circuit diagram that is used for switch sensor that Fig. 1 provides for the utility model embodiment 1;
The circuit diagram that is used for switch sensor that Fig. 2 provides for the utility model embodiment 2;
The circuit diagram that is used for switch sensor that Fig. 3 provides for the utility model embodiment 3;
The circuit diagram that is used for switch sensor that Fig. 4 provides for the utility model embodiment 4.
Embodiment
Below in conjunction with drawings and Examples content of the present utility model is further described.
As shown in Figure 1, the circuit that is used for switch sensor that present embodiment provides comprises TMR (tunnel magneto resistance) element 1, resistance 2, the first current source 3 and the second current source 4.TMR element 1 is electrically connected with the first current source 3.Resistance 2 is electrically connected with the second current source 4.TMR element 1 is electrically connected with resistance 2, and TMR element 1 is connected with for example power supply (not shown) with node between the resistance 2.The first current source 3 is electrically connected with the second current source 4, and the ground connection for example of the node between the first current source 3 and the second current source 4.TMR element 1, resistance 2, the first current source 3 and the second current source 4 are respectively as the brachium pontis electric bridge that is electrically connected to form.The output of this electric bridge is Out1 and Out2.
As shown in Figure 2, the circuit that is used for switch sensor that present embodiment provides comprises TMR element 1, resistance 2, the first current source 3 and the second current source 4.TMR element 1 is electrically connected with the first current source 3.Resistance 2 is electrically connected with the second current source 4.TMR element 1 is electrically connected with resistance 2, and the ground connection for example of the node between TMR element 1 and the resistance 2.The first current source 3 is electrically connected with the second current source 4, and the first current source 3 for example is connected with the power supply (not shown) with node between the second current source 4.TMR element 1, resistance 2, the first current source 3 and the second current source 4 are respectively as the brachium pontis electric bridge that is electrically connected to form.The output of this electric bridge is Out1 and Out2.
As shown in Figure 3, the circuit that is used for switch sensor that present embodiment provides comprises TMR element 1, resistance 2, the first current source 3, the second current source 4, variable gain amplifier (VGA) 5 and comparator 6.TMR element 1 is electrically connected with the first current source 3.Resistance 2 is electrically connected with the second current source 4.TMR element 1 is electrically connected with resistance 2, and TMR element 1 for example is connected with the power supply (not shown) with node between the resistance 2.The first current source 3 is electrically connected with the second current source 4, and the ground connection for example of the node between the first current source 3 and the second current source 4.TMR element 1, resistance 2, the first current source 3 and the second current source 4 are respectively as the brachium pontis electric bridge that is electrically connected to form.TMR element 1 and node between the first current source 3 are that the output Out1 of electric bridge is electrically connected with the input of variable gain amplifier 5, the output of variable gain amplifier 5 is electrically connected with the first input end of comparator 6, resistance 2 and node between the second current source 4 are that the output Out2 of electric bridge is electrically connected with the second input of comparator 6, and the output of comparator 6 is Out.
As shown in Figure 4, the circuit that is used for switch sensor that present embodiment provides comprises TMR element 1, resistance 2, the first current source 3, the second current source 4, variable gain amplifier 5 and comparator 6.TMR element 1 is electrically connected with the first current source 3.Resistance 2 is electrically connected with the second current source 4.TMR element 1 is electrically connected with resistance 2, and the ground connection for example of the node between TMR element 1 and the resistance 2.The first current source 3 is electrically connected with the second current source 4, and the first current source 3 is electrically connected with for example power supply (not shown) with node between the second current source 4.TMR element 1, resistance 2, the first current source 3 and the second current source 4 are respectively as the brachium pontis electric bridge that is electrically connected to form.TMR element 1 and node between the first current source 3 are that the output Out1 of electric bridge is electrically connected with the input of variable gain amplifier 5, the output of variable gain amplifier 5 is electrically connected with the first input end of comparator 6, resistance 2 and node between the second current source 4 are that the output Out2 of electric bridge is electrically connected with the second input of comparator 6, and the output of comparator 6 is Out.
Described circuit adopts the current drive-type bridge structure, and it is output as difference output, and therefore the power consumption of described circuit is lower, when the input voltage of described circuit is 3V, is not adding in the situation of dormant circuit, and the power consumption of described circuit is less than or equal to 5 μ W.The resistance value size of the power consumption of described circuit and TMR element and resistance is without direct relation, and namely the power consumption of described circuit is not subjected to the impact of the resistance value size of TMR element and resistance.Described circuit can realize comprising the bridge structure of single TMR element, so that the manufacture craft of the TMR element that adopts in the described circuit is simplified.Described circuit can be saved the size of its packaging body.
Should be appreciated that the above detailed description of the technical solution of the utility model being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art can make amendment to the technical scheme that each embodiment puts down in writing on the basis of reading the utility model specification, perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (4)
1. the circuit that is used for switch sensor, it is characterized in that, this circuit comprises TMR element (1), resistance (2), the first current source (3) and the second current source (4), described TMR element (1) is electrically connected with described the first current source (3), described resistance (2) is electrically connected with described the second current source (4), described TMR element (1) is electrically connected with described resistance (2), described the first current source (3) is electrically connected with described the second current source (4), described TMR element (1), described resistance (2), described the first current source (3) and described the second current source (4) are respectively as the brachium pontis electric bridge that is electrically connected to form;
Described TMR element (1) mates mutually with the temperature coefficient of described resistance (2), described the first current source (3) and described the second current source (4) are used for providing constant electric current, described resistance (2) is used for providing the resistance value of mating with described TMR element (1), and described TMR element (1) is used for the variation of induction external magnetic field.
2. the circuit for switch sensor according to claim 1 is characterized in that, described TMR element (1) is connected with power supply with node between the described resistance (2); Node ground connection between described the first current source (3) and described the second current source (4).
3. the circuit for switch sensor according to claim 1 is characterized in that, the node ground connection between described TMR element (1) and the described resistance (2); Described the first current source (3) is connected with power supply with node between described the second current source (4).
4. according to claim 2 or 3 described circuit for switch sensor, it is characterized in that, described circuit also comprises variable gain amplifier (5) and comparator (6), described TMR element (1) is electrically connected with the input of described variable gain amplifier (5) with node between described the first current source (3), the output of described variable gain amplifier (5) is electrically connected with the first input end of described comparator (6), and described resistance (2) is electrically connected with the second input of described comparator (6) with node between described the second current source (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220548243 CN202889316U (en) | 2012-10-24 | 2012-10-24 | Circuit for switch sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220548243 CN202889316U (en) | 2012-10-24 | 2012-10-24 | Circuit for switch sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202889316U true CN202889316U (en) | 2013-04-17 |
Family
ID=48080702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220548243 Expired - Lifetime CN202889316U (en) | 2012-10-24 | 2012-10-24 | Circuit for switch sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202889316U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931965A (en) * | 2012-10-24 | 2013-02-13 | 无锡乐尔科技有限公司 | Circuit for turning on and off sensor |
-
2012
- 2012-10-24 CN CN 201220548243 patent/CN202889316U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931965A (en) * | 2012-10-24 | 2013-02-13 | 无锡乐尔科技有限公司 | Circuit for turning on and off sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130417 |
|
| CX01 | Expiry of patent term |