CN112688679A - Non-contact sensor switch based on Hall and logic magnetic coding technology - Google Patents
Non-contact sensor switch based on Hall and logic magnetic coding technology Download PDFInfo
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- CN112688679A CN112688679A CN201910994757.XA CN201910994757A CN112688679A CN 112688679 A CN112688679 A CN 112688679A CN 201910994757 A CN201910994757 A CN 201910994757A CN 112688679 A CN112688679 A CN 112688679A
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Abstract
The invention relates to a non-contact sensor switch based on a Hall and logic magnetic coding technology, which comprises a non-contact sensor circuit and a packaging shell thereof, wherein the non-contact sensor circuit comprises a relay, the relay comprises an input end and an output end, the non-contact sensor circuit controls the relay to realize conduction or blocking through an AND logic operation circuit and a NOT gate circuit, the AND logic operation circuit is composed of logic magnetic codes according to the magnetic pole direction, the position and the number through N single-stage Hall elements. The invention only shares the open-drain output characteristics of one pull-up resistor and a plurality of unipolar non-latching Hall elements, and the logic magnetic code is formed by the magnetic pole direction, position and number of the unipolar non-latching Hall elements, thereby realizing the magnetic coding of the self-composition and logic operation relationship of the plurality of Hall elements and achieving the purposes of small size, stability, reliability, rapidness and convenience.
Description
Technical Field
The invention relates to the field of sensor switches, in particular to a non-contact sensor switch based on Hall and logic magnetic coding technology.
Background
The hall effect was discovered by the american physicist hall in 1879 when studying the mechanism of metal conduction: an external magnetic field perpendicular to the conductor current can cause a potential difference to appear at both ends of the conductor current direction, and the phenomenon is called Hall effect. The application of the Hall effect is mostly applied to the field of switches, and the Hall sensor has the characteristic of no contact, so that the Hall effect can be applied to switches in the fields of sealing, water proofing, service life prolonging and the like, particularly to gear switches.
The Hall element can be conducted only after being contacted closely through magnetic induction corresponding to the magnetic direction. The traditional sensor is only used as a simple on-off sensing device, and a plurality of Hall elements are not combined into a logic code, so that the sensor has no password, and can be easily triggered by a single magnet. For example, the European Union IDEM brand magnetic coding interlock switch uses three Hall elements which do not form a logical operation relation, wherein one switch can be easily triggered to act by only using a single magnet, and the other two Hall elements form a logical relation, but because the quantity is too small, only two Hall elements can simultaneously trigger the sensor by using the north and south poles of one magnet, and therefore the security level of the brand magnetic coding sensor is lower.
The invention aims to design a contactless sensor switch based on Hall and logic magnetic coding technology aiming at the problems in the prior art.
Disclosure of Invention
In view of the problems in the prior art, the present invention provides a contactless sensor switch based on hall and logic magnetic encoding technology, which can effectively solve the problems in the prior art.
The technical scheme of the invention is as follows:
the utility model provides a contactless sensor switch based on hall and logic magnetic coding technique, contains contactless sensor circuit and encapsulation shell, contactless sensor circuit includes the relay, the relay contains control coil input end and normally open and normally closed contact output, contactless sensor circuit through based on N single-stage hall element constitute with operation logic circuit and NOT gate circuit control the relay realizes switching on or blocking, pass through with logic operation circuit N single-stage hall element constitutes logic magnetic code according to magnetic pole direction, position, quantity.
Furthermore, a power input polarity protection circuit is arranged at the input end of the AND logic operation circuit.
Further, the power input polarity protection circuit is composed of a self-recovery fuse device F1 and a diode D1, and current-limiting protection is performed through a voltage regulator.
Further, the non-gate circuit is composed of a compound triode Q1-1 and a compound triode Q1-2, the base of the compound triode Q1-1 is connected to a pull-up resistor R1, the base of the compound triode Q1-2 is connected to a pull-down resistor R3, the collector of the compound triode Q1-1 and the base of the compound triode Q1-2 are connected to the pull-up resistor R2, the emitter of the compound triode Q1-1, the pull-down resistor R2 and the emitter of the compound triode Q1-2 are connected to the ground wire, and the collector of the compound triode Q1-2 is connected to the relay.
Further, the and logic operation circuit includes N single-stage hall elements He, the collectors of which are connected to the power supply stage of the single-stage hall element He of the next stage, and the power supply stage of the single-stage hall element He of the foremost stage is connected to the pull-up resistor R1.
Further, a compound light emitting tube LED1-1 is connected between the collector of the compound triode Q1-1 and the pull-up resistor R2.
Further, it is characterized in that: the compound light emitting tube LED1-1 is a red compound light emitting tube.
Further, it is characterized in that: and a compound light emitting tube LED1-2 is connected between the base electrode of the compound triode Q1-2 and the pull-up resistor R2.
Further, the compound light emitting tube LED1-2 is a green compound light emitting tube.
The invention has the advantages that:
the invention only shares the open-drain output characteristics of one pull-up resistor and a plurality of unipolar non-latching Hall elements, and the logic magnetic code is formed by the magnetic pole direction, position and number of the unipolar non-latching Hall elements, so that the magnetic coding of the self-composition and logic operation relation of the plurality of Hall elements is realized, all CMOS logic IC devices are omitted, all logic circuits except the Hall elements are eliminated, and the function application of the sensor identification technology with higher multielement magnetic coding security level in a control system is realized. The purposes of small size, stability, reliability, rapidness and convenience are achieved.
Meanwhile, the invention utilizes the forward conduction light-emitting mechanism difference of the red and green light-emitting tubes, the generated forward voltage drops are different, and the two composite triodes can reliably work at the required voltage.
The logic magnetic coding non-contact sensor has high EMC electromagnetic compatibility, has no electromagnetic field interference to the outside, can resist the interference of an external high-strength electromagnetic field, and can be applied to petrochemical industry, and is flammable and explosive; medical food, medical health; life safety and equipment safety; and aviation avionics, aeronautical landing gear detection; automatic artillery filling detection; remote sensing control system and building synthesis. Because the circuit is simple and small in size, the signal position is better and more accurate in data capture, the production efficiency is improved, the personal safety and the equipment safety are ensured, and the method is a more cost-effective technology.
Drawings
Fig. 1 is a working principle diagram of the first embodiment.
Fig. 2 is a circuit diagram of a contactless sensor according to a second embodiment.
Detailed Description
To facilitate understanding of those skilled in the art, the structure of the present invention will now be described in further detail by way of examples in conjunction with the accompanying drawings:
the first embodiment is as follows:
referring to fig. 1, a contactless sensor switch based on hall and logic magnetic coding technique contains contactless sensor circuit and its encapsulation shell 1, contactless sensor circuit includes the relay, the relay contains control coil input end and normally open and normally closed contact output, contactless sensor circuit through based on N single-stage hall element 2 constitute with operation logic circuit and not gate circuit control the relay realizes switching on or blocking, with the logic operation circuit through N single-stage hall element 2 constitutes logic magnetic code according to magnetic pole direction, position, quantity, be provided with power input polarity protection circuit with the input of logic operation circuit.
During operation, referring to fig. 1, after the sensor switch is packaged by a shell 1, the same number of single-stage hall elements 2 are adopted, and magnets 3 corresponding to the positions and the magnetic pole directions of the single-stage hall elements form a decoding key, the decoding key is close to the position of the sensor corresponding to an arithmetic logic circuit, and the N single-stage hall elements 2 are conducted at the same time under the induction of the decoding key to control the suction action of a relay.
Example two:
referring to fig. 2, the contactless sensor circuit includes a single-stage hall element He, a composite transistor Q1-1, a composite transistor Q1-2, a pull-up resistor R1, a pull-up resistor R2, a pull-down resistor R3, a filter capacitor C1, a diode D1, a self-recovery fuse device F1, and a voltage stabilizer; the self-recovery fuse device F1 and the diode D1 form a power input polarity protection circuit, and current limiting protection is carried out through the voltage stabilizer; the non-gate circuit consists of the composite triode Q1-1 and a composite triode Q1-2, wherein the base electrode of the composite triode Q1-1 is connected to the pull-up resistor R1, the base electrode of the composite triode Q1-2 is connected to the pull-down resistor R3, the collector electrode of the composite triode Q1-1 and the base electrode of the composite triode Q1-2 are connected to the pull-up resistor R2, the emitter electrode of the composite triode Q1-1, the pull-down resistor R2 and the emitter electrode of the composite triode Q1-2 are connected to the ground wire, and the collector electrode of the composite triode Q1-2 is connected to the relay; the AND logic operation circuit comprises N single-stage Hall elements He, the collector of each single-stage Hall element He is connected to the power supply stage of the single-stage Hall element He at the next stage, and the power supply stage of the single-stage Hall element He at the foremost stage is connected to the pull-up resistor R1.
Further, a compound light emitting tube LED1-1 is connected between the collector of the compound triode Q1-1 and the pull-up resistor R2.
Further, the compound light emitting tube LED1-1 is a red compound light emitting tube.
Further, a compound light emitting tube LED1-2 is connected between the base of the compound triode Q1-2 and the pull-up resistor R2.
Further, the compound light emitting tube LED1-2 is a green compound light emitting tube.
The working principle of the circuit is as follows:
the AND operation logic circuit adopts N nodes according to requirements, correspondingly utilizes N unipolar Hall He elements and a pull-up resistor R1 to form the AND operation logic circuit, and when the N unipolar Hall elements meet the conditions of magnetic pole direction, position and quantity, the lower end of the pull-up resistor R1 outputs low level to the base electrode of the compound triode Q1-1;
the composite triode Q1-1, the composite triode Q1-2 and surrounding components form a NOT gate circuit, meanwhile, the difference of forward conduction and light emitting mechanisms of red and green light emitting tubes is utilized, the generated forward voltage drops are different, the red light is ensured to reliably work in a standby state and light in a standby state, when the conditions of magnetic pole direction, position and quantity are met, the lower end of a pull-up resistor R1 outputs a low level to stop the Q1-1 to turn off the red light, a positive power supply immediately passes through a pull-down resistor R2-green light-composite triode Q1-2 emitter junction, the composite triode Q1-2 is conducted to a saturated Relay to be attracted to enter a working state, and a reliable and stable conduction circuit is obtained.
A power input polarity protection circuit is formed by a part self-recovery safety device F1 and a diode D1, and the protection time delay of the circuit is ahead of the damage duration of a semiconductor transistor circuit, so that the protection effect is achieved.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (9)
1. The utility model provides a contactless sensor switch based on hall and logic magnetic encoding technique contains contactless sensor circuit and encapsulation shell, contactless sensor circuit includes the relay, the relay contains control coil input and normally opens and normally closed contact output, its characterized in that: the non-contact sensor circuit controls the relay to be conducted or blocked through an AND operation logic circuit and a NOT gate circuit which are composed of N single-stage Hall elements, and the AND operation logic circuit is composed of the N single-stage Hall elements according to the magnetic pole direction, the position and the number to form a logic magnetic password.
2. The contactless sensor switch based on hall and logic magnetic coding technology as claimed in claim 1, characterized in that: and the input end of the AND logic operation circuit is provided with a power input polarity protection circuit.
3. The contactless sensor switch based on hall and logic magnetic coding technology as claimed in claim 2, characterized in that: the power input polarity protection circuit consists of a self-recovery fuse device F1 and a diode D1, and carries out current-limiting protection through a voltage stabilizer.
4. The contactless sensor switch based on hall and logic magnetic coding technology as claimed in claim 2, characterized in that: the NOT gate circuit is composed of a compound triode Q1-1 and a compound triode Q1-2, the base electrode of the compound triode Q1-1 is connected to a pull-up resistor R1, the base electrode of the compound triode Q1-2 is connected to a pull-down resistor R3, the collector electrode of the compound triode Q1-1 and the base electrode of the compound triode Q1-2 are connected to the pull-up resistor R2, the emitter electrode of the compound triode Q1-1, the pull-down resistor R2 and the emitter electrode of the compound triode Q1-2 are connected to the ground wire, and the collector electrode of the compound triode Q1-2 is connected to the relay.
5. The contactless sensor switch based on hall and logic magnetic coding technology as claimed in claim 2, characterized in that: the AND logic operation circuit comprises N single-stage Hall elements He, the collectors of the single-stage Hall elements He are connected to the power supply stage of the single-stage Hall elements He at the next stage, and the power supply stage of the single-stage Hall element He at the foremost stage is connected to a pull-up resistor R1.
6. The contactless sensor switch based on Hall and logic magnetic coding technology as claimed in claim 4, characterized in that: a compound light emitting tube LED1-1 is connected between the collector of the compound triode Q1-1 and the pull-up resistor R2.
7. The contactless sensor switch based on Hall and logic magnetic coding technology as claimed in claim 6, characterized in that: the compound light emitting tube LED1-1 is a red compound light emitting tube.
8. The contactless sensor switch based on Hall and logic magnetic coding technology as claimed in claim 4, characterized in that: and a compound light emitting tube LED1-2 is connected between the base electrode of the compound triode Q1-2 and the pull-up resistor R2.
9. The contactless sensor switch based on hall and logic magnetic coding technology as claimed in claim 8, characterized in that: the compound light emitting tube LED1-2 is a green compound light emitting tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910994757.XA CN112688679A (en) | 2019-10-18 | 2019-10-18 | Non-contact sensor switch based on Hall and logic magnetic coding technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910994757.XA CN112688679A (en) | 2019-10-18 | 2019-10-18 | Non-contact sensor switch based on Hall and logic magnetic coding technology |
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| Publication Number | Publication Date |
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| CN112688679A true CN112688679A (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910994757.XA Pending CN112688679A (en) | 2019-10-18 | 2019-10-18 | Non-contact sensor switch based on Hall and logic magnetic coding technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279470A (en) * | 2021-12-17 | 2022-04-05 | 上海艾为电子技术股份有限公司 | Latching Hall sensor and electronic device |
| CN114279470B (en) * | 2021-12-17 | 2024-06-07 | 上海艾为电子技术股份有限公司 | Latching hall sensor and electronic device |
-
2019
- 2019-10-18 CN CN201910994757.XA patent/CN112688679A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279470A (en) * | 2021-12-17 | 2022-04-05 | 上海艾为电子技术股份有限公司 | Latching Hall sensor and electronic device |
| CN114279470B (en) * | 2021-12-17 | 2024-06-07 | 上海艾为电子技术股份有限公司 | Latching hall sensor and electronic device |
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