CN216485459U - Magnetic pole detection circuit and device - Google Patents
Magnetic pole detection circuit and device Download PDFInfo
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- CN216485459U CN216485459U CN202122995425.9U CN202122995425U CN216485459U CN 216485459 U CN216485459 U CN 216485459U CN 202122995425 U CN202122995425 U CN 202122995425U CN 216485459 U CN216485459 U CN 216485459U
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Abstract
The utility model discloses a magnetic pole detection circuit and equipment. The circuit comprises: the device comprises a Hall element, an amplifying circuit, a judging circuit, a first indicator light, a second indicator light and a constant voltage source; the input end of the amplifying circuit is connected with the output end of the Hall element; the output end of the amplifying circuit is connected with the input end of the judging circuit; the judging circuit is used for outputting a control signal to light the first indicator light or the second indicator light according to the magnitude of the input level; the constant voltage source is used for supplying power to the Hall element and providing reference voltage for the amplifying circuit. The magnetic pole detection circuit can accurately detect the weak magnetic pole by arranging the constant voltage source to supply power to the Hall element and providing accurate reference voltage for the amplifying circuit.
Description
Technical Field
The utility model relates to the field of magnetic pole detection, in particular to a magnetic pole detection circuit and a magnetic pole detection device.
Background
With the high-end design of 3C products and household products, magnetic connectors are increasingly used, magnetic poles on the connectors need to be correctly installed, and each magnetic connector needs to detect the magnetic poles and the magnetic field intensity in order to improve the production efficiency and the product quality.
SUMMERY OF THE UTILITY MODEL
One of the objectives of the present invention is to provide a magnetic pole detection circuit, which can accurately perform weak magnetic pole detection; the second purpose of the present invention is to provide a magnetic pole detection device, which can accurately detect weak magnetic poles and provide a detection tool with good performance and low cost for the magnetic pole and magnetic field intensity detection in large scale in factories.
To achieve the first object of the present invention, the present invention provides a magnetic pole detection circuit comprising: the device comprises a Hall element, an amplifying circuit, a judging circuit, a first indicator light, a second indicator light and a constant voltage source; the input end of the amplifying circuit is connected with the output end of the Hall element; the output end of the amplifying circuit is connected with the input end of the judging circuit; the judging circuit is used for outputting a control signal to light the first indicator light or the second indicator light according to the magnitude of the input level; the constant voltage source is used for supplying power to the Hall element and providing reference voltage for the amplifying circuit.
Further, the amplifying circuit comprises a first amplifying unit, a first resistor and a second resistor; the first resistor is bridged between the negative input end of the first amplifying unit and the output end of the Hall element; the second resistor is bridged between the negative input end and the output end of the first amplifying unit; the positive input terminal of the first amplifying unit is set to input a third level.
Further, the amplifying circuit further comprises a third resistor and a fourth resistor, wherein the third resistor is bridged between the reference voltage input end of the first amplifying unit and the output end of the constant voltage source; the fourth resistor is connected between the reference voltage input end of the first amplifying unit and the ground in a bridge mode.
Furthermore, the constant voltage source is an LDO, and an input end of the constant voltage source is connected to a power supply of the magnetic pole detection circuit.
Further, the judging circuit comprises a first comparing unit and a second comparing unit,
the output end of the amplifying circuit is connected with the positive input end of the first comparing unit and the negative input end of the second comparing unit;
a negative input terminal of the first comparing unit is set to input a first level; the output end of the first comparison unit is a first output end of the judgment circuit and is used for outputting a control signal to drive the first indicator light;
a positive input terminal of the second comparing unit is set to input a second level; the output end of the second comparing unit is the first output end of the judging circuit and is used for outputting a control signal to drive the second indicator light.
Further, the first level is less than 2.5V, and the second level is greater than 2.5V.
Furthermore, the judging circuit further comprises a first adjustable resistor and a second adjustable resistor, the first adjustable resistor is bridged between a power supply and the ground, the second adjustable resistor is bridged between the power supply and the ground, and an adjustable output end of the first adjustable resistor is connected with a negative input end of the first comparing unit and used for setting a first level; the adjustable output end of the second adjustable resistor is connected with the positive input end of the second comparing unit and is used for setting a second level.
Furthermore, the magnetic pole detection circuit also comprises a first switching tube and a second switching tube;
the control end of the first switching tube is connected with the first output end of the judging circuit; the input end of the first switch tube is connected with a power supply, and the output end of the first switch tube is grounded through a first indicator lamp and a resistor;
the control end of the second switching tube is connected with the second output end of the judging circuit; the input end of the second switch tube is connected with a power supply, and the output end of the second switch tube is grounded through a second indicator lamp;
the first switch tube and the second switch tube are triodes or MOS tubes.
Furthermore, the power supply further comprises an active buzzer, the anode of the active buzzer is connected with the output end of the second switch tube, and the cathode of the active buzzer is connected with the output end of the first switch tube.
In order to achieve the second object of the present invention, the present invention further provides a magnetic pole detection apparatus, which comprises a control board, a frame and one or more object positioning boards;
the control board comprises one or more groups of magnetic pole detection circuits according to any one of the first object of the utility model;
the detected object positioning plate is arranged on the rack, a slotted hole is formed in the middle of the detected object positioning plate, and a Hall element on the control plate is arranged at the slotted hole.
The utility model realizes the following technical effects:
the magnetic pole detection circuit can accurately detect the weak magnetic pole and the magnetic field intensity by arranging the constant voltage source to supply power to the Hall element and providing accurate reference voltage for the amplifying circuit.
The magnetic pole detection device adopts the magnetic pole detection circuit which can accurately detect the weak magnetic pole, and provides a detection tool with good performance and low cost for the magnetic pole detection of factories in large batch.
Drawings
FIG. 1 is a circuit schematic of the magnetic pole detection circuit of the present invention;
FIG. 2 is a graph of magnetic field strength versus output power for a linear Hall element;
fig. 3 is a structural view of the magnetic pole detection apparatus of the present invention.
Detailed Description
To further illustrate the various embodiments, the utility model provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The utility model will now be further described with reference to the accompanying drawings and detailed description.
As shown in FIG. 1, the utility model provides an embodiment of a magnetic pole detection circuit, which comprises sockets J1, J3, J4, a chip U3, a first amplifying circuit, a judgment circuit, switching tubes Q5, Q6, an indicator light D1, an indicator light D2 and the like.
Wherein, the socket J4 is used for connecting an external power supply and is marked as VCC; the socket J3 is used to connect a 3-pin hall element, and the socket J1 is used to connect an active buzzer.
In the present embodiment, the hall element is a hall element of high sensitivity, model YS49E-a/B, for magnetic pole and magnetic strength detection as shown in fig. 1. In the case of no magnetic field (B ═ 0Gs), the output voltage of the hall element is half of the power supply. When a magnetic field with S polarity is close to the front surface (printed surface) of the circuit, the output power supply rises along with the increase of the S polarity, and conversely, when a magnetic field with N polarity is close to the front surface of the circuit, the output voltage falls along with the increase of the magnetic field with N polarity. For the present element, the rising and falling voltage amplitudes are symmetrical. The magnetic field-voltage curve is shown in fig. 2.
In this embodiment, the power supply is a 9V or 12V power supply, and is denoted as VCC. The chip U3 is an LDO type power management chip, the model is 78L05, the output end Vout outputs constant 5V voltage with low ripple to supply power to the Hall element connected with the socket J3, and the typical working voltage of the Hall element is 5V.
In this embodiment, the first amplifying circuit is composed of an amplifier U4B, resistors R6, R8, R9 and R13, the resistor R6 is bridged between the negative input end and the output end of the amplifier U4B, the resistor R8 is bridged between the output end of the hall element of the socket J3 and the negative input end of the amplifier U4B, and the resistors R6 and R8 are used for accurately controlling the signal amplification factor of the hall element; for the Hall linear element, linear amplification can be realized through the amplifying circuit. The reference level of the positive input terminal of the amplifier U4B is provided by a voltage divider circuit consisting of resistors R9 and R13, a resistor R9 is connected between the output terminal Vout of U3 and the positive input terminal of the amplifier U4B, and R13 is connected between GND and the positive input terminal of the amplifier U4B. The LDO can output a stable direct current power supply with low ripple, can be used as a constant voltage source, and can generate a stable reference voltage by dividing voltage through resistors R9 and R13.
In the embodiment, according to the magnetic field intensity range of the product to be detected, the amplification factor of the first amplification circuit can be adjusted by adjusting the ratio of the resistors R6 and R8, so that the detection accuracy of the magnetic field intensity is improved. If the magnetic field intensity of the product to be detected is between 50Gs and 90Gs, the amplification factor of the first amplification circuit can be adjusted to 10 times, and the output voltage is in two intervals of (3.67V-4.2V) and (0.9V-1.33V).
In this embodiment, the determining circuit includes a comparator U5 (the comparator U5 includes two comparing units U5A and U5B), and adjustable resistors RN and RS. The output end of U4B is connected with the positive input end of U5A and the negative input end of U5B; the negative input of U5A is set to input a first level; the output end of the U5A is connected with the control end of the switch tube Q5; the positive input of U5B is set to input a second level; the output end of the U5B is connected with the control end of the switch tube Q6.
The input end of the switching tube Q5 is connected with a power supply VCC, and the output end is connected with the anode of an indicator light D1; the cathode of the indicator light D1 is grounded through a resistor R1;
similarly, the input end of the switching tube Q6 is connected with the power supply VCC, and the output end is connected to the anode of the indicator light D2; the cathode of the indicator lamp D2 is connected to ground through a resistor R2.
In this embodiment, the amplifier U4B and the comparator U5 are powered by the power source VCC.
The adjustable resistors RN and RS are in the form of potentiometers, and the first level of U5A and the second level of U5B can be conveniently set by adopting the adjustable resistors RN and RS. And adjusting the potentiometer according to the magnetic field intensity requirement of the detected object to enable the indicator lamp to display according to the set magnetic field intensity requirement. In the case of only performing the magnetic pole detection, the first level is set to a value slightly less than 2.5V, the second level is set to a value slightly greater than 2.5V, and the first indicator light D1 and the second indicator light D2 are used to indicate whether the detected magnetic pole polarity is N pole or S pole, respectively. When the magnetic pole detection is carried out and the magnetic field intensity indication is carried out, the first level is set to be a value smaller than 2.5V and corresponding to the lower limit value of the N-pole magnetic field intensity of the product, the second level is set to be a value larger than 2.5V and corresponding to the lower limit value of the S-pole magnetic field intensity of the product, when the first indicator lamp D1 is turned on, the detected magnetic pole polarity is the N pole, and the magnetic field intensity is larger than the set lower limit value; when the second indicator light D2 is turned on, it indicates that the magnetic pole polarity is detected as the S pole and the magnetic field strength is greater than the set lower limit value.
The resistors R27, R1 and R2 are current-limiting resistors.
Two ends of the socket J1 are respectively connected to the output end of the switching tube Q5 and the output end of the switching tube Q6. The positive pole of the active buzzer is connected with the output end of the switching tube Q6 through a socket J1, and the negative pole of the active buzzer is connected with the output end of the switching tube Q5 through a socket J1.
The working principle is as follows:
when the magnetic object approaches the Hall element, the Hall element outputs a level signal to the amplifier U4B according to the polarity of the magnetic pole and the magnetic field intensity, and the level signal is linearly amplified by the amplifier U4B and then output to a subsequent comparison circuit.
Since the amplifier U4B is inverting amplification, when the amplifier U4B inputs high level, it outputs low level; when the amplifier U4B inputs a low level, a high level is output.
When the Hall element detects that the polarity of the magnetic pole is N pole, the output of the amplifier U4B is high level, the switching tube Q5 is controlled to be conducted through U5A, and the first indicator lamp D1 is turned on at the moment, which indicates that the detected polarity of the magnetic pole is N pole.
When the Hall element detects that the polarity of the magnetic pole is S pole, the output of the amplifier U4B is low level, the switching tube Q6 is controlled to be conducted through U5B, and the second indicator light D2 is lighted at the moment, which indicates that the detected polarity of the magnetic pole is S pole.
When neither the first indicator light D1 nor the second indicator light D2 was lit, it indicated that the magnetic pole strength was abnormal.
Two pins of the socket J1 are respectively connected to the output ends of the switching tubes Q5 and Q6 and are used for connecting an active buzzer.
When Q5 is off and Q6 is on, the voltage at the output of Q6 is higher than the voltage at the output of Q5, at which time the active buzzer sounds, indicating that the correct pole is detected.
As shown in fig. 3, a specific embodiment of a magnetic pole detection apparatus employing the above magnetic pole detection circuit is given.
The magnetic pole detection device comprises a frame 10, a power switch 60, a red indicator light 40, a green indicator light 30, a buzzer 50, a detected object positioning plate 20 and a control plate arranged inside the frame 10. Wherein the hall element to which the control board is connected is disposed in the slot hole 21 in the middle of the detected object positioning plate 3, thereby enabling magnetic pole detection of the detected object placed on the detected object positioning plate 3. In this embodiment, two sets of magnetic pole detection circuits are disposed on the control board, and the power supply parts of the two sets of magnetic pole detection circuits can be shared; the red indicator light 40 is a first indicator light D1 in the magnetic pole detection circuit, and the green indicator light 30 is a second indicator light D2 in the magnetic pole detection circuit. In other embodiments, the number of the magnetic pole detection circuits may be determined according to the needs, and is not limited.
While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. A magnetic pole detection circuit, comprising: the device comprises a Hall element, an amplifying circuit, a judging circuit, a first indicator light, a second indicator light and a constant voltage source; the input end of the amplifying circuit is connected with the output end of the Hall element; the output end of the amplifying circuit is connected with the input end of the judging circuit; the judging circuit is used for outputting a control signal to light the first indicator light or the second indicator light according to the magnitude of the input level; the constant voltage source is used for supplying power to the Hall element and providing reference voltage for the amplifying circuit.
2. The magnetic pole detection circuit according to claim 1, wherein the amplification circuit includes a first amplification unit, a first resistor, and a second resistor; the first resistor is bridged between the negative input end of the first amplifying unit and the output end of the Hall element; the second resistor is bridged between the negative input end and the output end of the first amplifying unit; the positive input terminal of the first amplifying unit is set to input a third level.
3. The magnetic pole detection circuit of claim 2, wherein the amplification circuit further comprises a third resistor and a fourth resistor, the third resistor being connected across the reference voltage input terminal of the first amplification unit and the output terminal of the constant voltage source; the fourth resistor is connected between the reference voltage input end of the first amplifying unit and the ground in a bridge mode.
4. The pole sense circuit of claim 1, wherein the constant voltage source is an LDO, and an input of the constant voltage source is coupled to a power supply of the pole sense circuit.
5. The magnetic pole detection circuit according to claim 1, wherein the judgment circuit includes a first comparison unit and a second comparison unit,
the output end of the amplifying circuit is connected with the positive input end of the first comparing unit and the negative input end of the second comparing unit;
a negative input terminal of the first comparing unit is set to input a first level; the output end of the first comparison unit is a first output end of the judgment circuit and is used for outputting a control signal to drive the first indicator light;
a positive input terminal of the second comparing unit is set to input a second level; the output end of the second comparing unit is the first output end of the judging circuit and is used for outputting a control signal to drive the second indicator light.
6. The pole sense circuit of claim 5 wherein the first level is less than 2.5V and the second level is greater than 2.5V.
7. The magnetic pole detection circuit of claim 5, wherein the judgment circuit further comprises a first adjustable resistor and a second adjustable resistor, the first adjustable resistor is connected across the power supply and the ground, the second adjustable resistor is connected across the power supply and the ground, and an adjustable output terminal of the first adjustable resistor is connected with the negative input terminal of the first comparison unit for setting a first level; the adjustable output end of the second adjustable resistor is connected with the positive input end of the second comparing unit and is used for setting a second level.
8. The magnetic pole detection circuit of claim 1, further comprising a first switching tube and a second switching tube;
the control end of the first switching tube is connected with the first output end of the judging circuit; the input end of the first switch tube is connected with a power supply, and the output end of the first switch tube is grounded through a first indicator lamp and a resistor;
the control end of the second switching tube is connected with the second output end of the judging circuit; the input end of the second switch tube is connected with a power supply, and the output end of the second switch tube is grounded through a second indicator lamp;
the first switch tube and the second switch tube are triodes or MOS tubes.
9. The magnetic pole detection circuit of claim 8, further comprising an active buzzer, wherein a positive pole of the active buzzer is connected to the output terminal of the second switching tube, and a negative pole of the active buzzer is connected to the output terminal of the first switching tube.
10. A magnetic pole detection device is characterized by comprising a control panel, a machine frame and one or more detected object positioning plates;
the control board includes one or more sets of magnetic pole detection circuits as claimed in any one of claims 1 to 9;
the detected object positioning plate is arranged on the rack, a slotted hole is formed in the middle of the detected object positioning plate, and a Hall element on the control plate is arranged at the slotted hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122995425.9U CN216485459U (en) | 2021-12-01 | 2021-12-01 | Magnetic pole detection circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122995425.9U CN216485459U (en) | 2021-12-01 | 2021-12-01 | Magnetic pole detection circuit and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216485459U true CN216485459U (en) | 2022-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122995425.9U Active CN216485459U (en) | 2021-12-01 | 2021-12-01 | Magnetic pole detection circuit and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216485459U (en) |
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2021
- 2021-12-01 CN CN202122995425.9U patent/CN216485459U/en active Active
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