Current sensor

Abstract

The utility model discloses a current sensor, which is characterized in that the current sensor comprises a sensor shell and a printed circuit board, a magnetic core sheath is arranged between the sensor shell and the printed circuit board, a magnetic core is inserted in the magnetic core sheath, the magnetic core is of an annular structure with a magnetic core notch, and the magnetic core notch is provided with a magnetic core. The height of the magnetic core notch is smaller than the thickness of the magnetic core, the magnetic core sheath is of an annular structure, an annular magnetic core groove is formed in the side, close to the sensor shell, of the magnetic core sheath, the inner diameter and the outer diameter of the magnetic core groove are matched with the inner diameter and the outer diameter of the magnetic core, and a positioning cross beam is arranged between the inner diameter and the outer diameter of the magnetic core groove. The size of the positioning cross beam is matched with the size of the magnetic core notch, the positioning cross beam is inserted into the magnetic core notch, and the current sensor has the advantage that the stability of the current sensor is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor technical field, concretely is a current sensor. BACKGROUND

[0002] Current sensor is widely used in various power systems, industrial automation and electronic equipment, and the magnetic core is an important component in the current sensor, which can detect current and control circuit.

[0003] In the related art, the magnetic core is a ring structure with a completely cut gap, and the completely cut gap is prone to cause the deformation of the ring magnetic core, and the magnetic core cannot be completely fixed when assembled with the circuit board, thereby causing unstable performance of the current sensor. UTILITY MODEL CONTENT

[0004] In order to overcome the defects of the prior art, the utility model discloses a current sensor, which is provided with an incomplete cut magnetic core cutout, and has the advantages that the ring magnetic core is not prone to deformation, and the related components of the magnetic core sheath can completely fix the magnetic core and the printed circuit board, thereby fixing the Hall chip and significantly improving the stability of the current sensor.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A current sensor comprises a sensor shell and a printed circuit board, a magnetic core sheath is arranged between the sensor shell and the printed circuit board, and a magnetic core (300) is inserted into the magnetic core sheath; the magnetic core (300) is a ring structure with a magnetic core cutout, and the height of the magnetic core cutout is less than the thickness of the magnetic core; the magnetic core sheath is a ring structure, a ring-shaped magnetic core groove is arranged on the side of the magnetic core sheath close to the sensor shell, the inner and outer diameters of the magnetic core groove are adapted to the inner and outer diameters of the magnetic core, a positioning cross beam is arranged between the inner and outer diameters of the magnetic core groove, the size of the positioning cross beam is adapted to the size of the magnetic core cutout, and the positioning cross beam is inserted into the magnetic core cutout.

[0007] In some embodiments, first and second support portions are fixedly arranged on the side of the magnetic core sheath away from the magnetic core, a chip groove is arranged in the first support portion, a Hall chip is inserted into the chip groove, a Hall chip lead is arranged on the side of the Hall chip away from the sensor shell, a lead hole is arranged on the printed circuit board at a position corresponding to the Hall chip lead, the diameter of the lead hole is adapted to the diameter of the Hall chip lead, one end of the Hall chip lead is connected to the Hall chip, and the other end of the Hall chip lead passes out of the lead hole.

[0008] In some embodiments, the first support part is provided with a first positioning column and a second positioning column on the side away from the magnetic core, the printed circuit board is provided with a first positioning hole corresponding to the first positioning column and a second positioning hole corresponding to the second positioning column, and the printed circuit board is arranged on the upper end of the first support part and the second support part, the first positioning column passes through the first positioning hole, and the second positioning column passes through the second positioning hole.

[0009] In some embodiments, the second support part is provided with an engaging position on the side away from the magnetic core, and the printed circuit board is provided with an engaging slot corresponding to the engaging position.

[0010] In some embodiments, positioning protrusions are arranged on two corresponding surfaces in the chip slot, and a cavity formed between the positioning protrusions on the two corresponding surfaces is adapted to the Hall chip.

[0011] In some embodiments, the distance between the positioning protrusions on the two corresponding surfaces is 1.4 mm, and the width of the Hall chip is 1.2 mm.

[0012] In some embodiments, the positioning beam is located below the middle position of the bottom of the chip slot.

[0013] In some embodiments, the center axis of the positioning beam in the horizontal direction passes through the center of the bottom surface of the magnetic core sheath.

[0014] In some embodiments, a plurality of magnetic core buckles are arranged in the magnetic core slot close to the side of the sensor shell.

[0015] In some embodiments, the sensor shell is a hollow ring structure, the printed circuit board is provided with a through hole at the center position, and the inner diameter of the sensor shell is adapted to the inner diameter of the magnetic core sheath and the diameter of the through hole.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] 1. By arranging the incomplete cut magnetic core, the problem of easy deformation of the ring-shaped magnetic core is solved, the magnetic core shape is stable, and the current sensor performance is stable.

[0018] 2. By arranging the magnetic core sheath, the positioning beam and the magnetic core buckle in the magnetic core sheath, the magnetic core can be completely fixed in the magnetic core sheath, the magnetic core and the magnetic core sheath have no relative displacement, and the stability of the current sensor is further improved.

[0019] 3、By setting the first positioning hole and the second positioning hole, the magnetic core sheath and the circuit board have no relative displacement in the horizontal direction, and the clamping position is also set, so that the magnetic core sheath and the circuit board have no relative displacement in the vertical direction, thus completely fixing the positions of the magnetic core sheath and the circuit board, and accurately positioning the positions of the Hall chip and the Hall chip pin, so that the relative positions of the components of the current sensor are fixed, thereby improving the performance stability of the current sensor. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 An exploded perspective view of an embodiment of the present application.

[0021] Figure 2 Another perspective view of an embodiment of the present application.

[0022] Figure 3 An enlarged perspective view of position A in an embodiment of the present application. Figure 1

[0023] Figure 4 An enlarged perspective view of position B in an embodiment of the present application. Figure 1

[0024] Figure 5 An enlarged perspective view of position C in an embodiment of the present application. Figure 2

[0025] Figure 6 A top view of a magnetic core sheath in an embodiment of the present application.

[0026] Figure 7 A bottom view of a magnetic core sheath in an embodiment of the present application.

[0027] Figure 8 A sectional view of position D in an embodiment of the present application after assembling the printed circuit board, the magnetic core sheath and the magnetic core.

[0028] In the figure: 100, sensor shell; 200, magnetic core sheath; 210, magnetic core slot; 220, positioning cross beam; 230, first support part; 231, chip slot; 232, first positioning column; 233, second positioning column; 234, positioning protrusion; 240, second support part; 250, Hall chip; 251, Hall chip pin; 260, clamping position; 270, magnetic core buckle; 300, magnetic core; 310, magnetic core cutout; 400, printed circuit board; 410, pin hole; 420, first positioning hole; 430, second positioning hole; 440, clamping slot; 450, through hole. DETAILED DESCRIPTION

[0029] ​​​With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0030] Please refer to Figures 1-8 The embodiment provides a current sensor, which comprises a sensor shell 100 and a printed circuit board 400, a magnetic core sheath 200 is arranged between the sensor shell 100 and the printed circuit board 400, and a magnetic core 300 is inserted into the magnetic core sheath 200; the magnetic core 300 is annular and has a magnetic core cutout 310, the height of the magnetic core cutout 310 is less than the thickness of the magnetic core 300, that is, the magnetic core cutout 310 is an incomplete gap; the magnetic core sheath 200 is annular, an annular magnetic core groove 210 is arranged on the side of the magnetic core sheath 200 close to the sensor shell 100, the inner and outer diameters of the magnetic core groove 210 are adapted to the inner and outer diameters of the magnetic core 300, a positioning cross beam 220 is arranged between the inner and outer diameters of the magnetic core groove 210, the size of the positioning cross beam 220 is adapted to the size of the magnetic core cutout 310, and the positioning cross beam 220 is inserted into the magnetic core cutout 310, that is, the positioning cross beam 220 plays a role of accurate positioning during assembly, and secondly, the positioning cross beam 220 prevents the magnetic core 300 from rotating in the magnetic core sheath 200.

[0031] In the embodiment, a first support part 230 and a second support part 240 are fixedly arranged on the side of the magnetic core sheath 200 away from the magnetic core 300, a chip groove 231 is arranged in the first support part 230, a Hall chip 250 is inserted into the chip groove 231, a Hall chip pin 251 is arranged on the side of the Hall chip 250 away from the sensor shell 100, a pin hole 410 is arranged on the printed circuit board 400 at a position corresponding to the Hall chip pin 251, the diameter of the pin hole 410 is adapted to the diameter of the Hall chip pin 251, one end of the Hall chip pin 251 is connected to the Hall chip 250, and the other end of the Hall chip pin 251 passes out of the pin hole 410.

[0032] That is, when the printed circuit board 400 is assembled with the magnetic core sheath 200, the printed circuit board 400 is overlapped on the upper ends of the first support part 230 and the second support part 240, and the Hall chip pin 251 passes out of the pin hole 410.

[0033] It should be noted that the positions of the upper ends of the first support part 230 and the second support part 240 are not limited, and preferably, the first support part 230 and the second support part 240 are arranged on opposite sides.

[0034] In the embodiment, the first positioning column 232 and the second positioning column 233 are fixedly arranged on the first supporting part 230 away from the magnetic core 300, the first positioning hole 420 is arranged on the printed circuit board 400 corresponding to the first positioning column 232, the second positioning hole 430 is arranged on the printed circuit board 400 corresponding to the second positioning column 233, and the printed circuit board 400 is arranged on the upper end of the first supporting part 230 and the second supporting part 240, the first positioning column 232 passes through the first positioning hole 420, and the second positioning column 233 passes through the second positioning hole 430.

[0035] That is, the first positioning column 232 and the second positioning column 233 make the printed circuit board 400 and the magnetic core sheath 200 not relatively displace in the horizontal direction.

[0036] In the embodiment, the second supporting part 240 is provided with the clamping position 260 away from the magnetic core 300, and the printed circuit board 400 is provided with the clamping groove 440 corresponding to the clamping position 260.

[0037] That is, during assembly, the clamping position 260 is clamped in the clamping groove 440, so that the printed circuit board 400 and the magnetic core sheath 200 do not relatively displace in the vertical direction in the vertical position.

[0038] In the embodiment, the positioning protrusions 234 are arranged on two corresponding surfaces in the chip slot 231, and the cavity formed between the positioning protrusions 234 on the two corresponding surfaces is adapted to the size of the Hall chip 250. Preferably, the distance between the positioning protrusions 234 on the two corresponding surfaces is 1.4 mm, and the width of the Hall chip 250 is 1.2 mm. That is, the Hall chip 250 is inserted in the center of the chip slot 231.

[0039] In the embodiment, the positioning beam 220 is located below the middle position of the bottom of the chip slot 231.

[0040] That is, the Hall chip 250 is inserted in the center of the chip slot 231, and the Hall chip 250 is directly below the magnetic core cutout 310.

[0041] In the embodiment, the center axis of the positioning beam 220 in the horizontal direction passes through the center of the bottom surface of the magnetic core sheath 200.

[0042] In the embodiment, the magnetic core buckle 270 is arranged in the magnetic core slot 210 close to the sensor shell 100. The magnetic core buckle 270 can limit the magnetic core 300 in the magnetic core slot 210, so that the magnetic core 300 and the magnetic core sheath 200 do not relatively displace in the vertical direction.

[0043] In the embodiment, the sensor shell 100 is a hollow annular structure, the printed circuit board 400 is provided with a through hole 450 in the central part, and the inner diameter of the sensor shell 100 is adapted to the inner diameter of the magnetic core sheath 200 and the diameter of the through hole 450. That is, the sensor shell 100 is a hollow annular structure with one side opening, and the magnetic core 300, the magnetic core sheath 200 and the printed circuit board 400 are all placed in the hollow cavity between the inner and outer diameters of the sensor shell 100.

[0044] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A current sensor, characterized by The sensor shell (100) and the printed circuit board (400) are provided with a magnetic core sheath (200) therebetween, and a magnetic core (300) is inserted into the magnetic core sheath (200); The magnetic core (300) is a ring structure with a magnetic core cutout (310) having a height less than the thickness of the magnetic core (300); The magnetic core sheath (200) is a ring structure, and a ring-shaped magnetic core groove (210) is arranged on the side close to the sensor shell (100), the inner and outer diameters of the magnetic core groove (210) are adapted to the inner and outer diameters of the magnetic core (300), and a positioning cross beam (220) is arranged between the inner and outer diameters of the magnetic core groove (210), the size of the positioning cross beam (220) is adapted to the size of the magnetic core cutout (310), and the positioning cross beam (220) is inserted into the magnetic core cutout (310).

2. A current sensor according to claim 1, characterized in that The first support part (230) is fixedly arranged on the side away from the magnetic core (300), and a chip groove (231) is arranged in the first support part (230), a Hall chip (250) is inserted into the chip groove (231), the Hall chip (250) is arranged on the side away from the sensor shell (100), a Hall chip pin (251) is arranged on the Hall chip (250), a pin hole (410) is arranged on the printed circuit board (400) corresponding to the Hall chip pin (251), the diameter of the pin hole (410) is adapted to the diameter of the Hall chip pin (251), one end of the Hall chip pin (251) is connected to the Hall chip (250), and the other end of the Hall chip pin (251) passes through the pin hole (410).

3. A current sensor according to claim 2, wherein, The first support part (230) is fixedly arranged on the side away from the magnetic core (300), and a chip groove (231) is arranged in the first support part (230), a Hall chip (250) is inserted into the chip groove (231), the Hall chip (250) is arranged on the side away from the sensor shell (100), a Hall chip pin (251) is arranged on the Hall chip (250), a pin hole (410) is arranged on the printed circuit board (400) corresponding to the Hall chip pin (251), the diameter of the pin hole (410) is adapted to the diameter of the Hall chip pin (251), one end of the Hall chip pin (251) is connected to the Hall chip (250), and the other end of the Hall chip pin (251) passes through the pin hole (410).

4. A current sensor according to claim 2, wherein, The first support part (230) is fixedly arranged on the side away from the magnetic core (300), and a chip groove (231) is arranged in the first support part (230), a Hall chip (250) is inserted into the chip groove (231), the Hall chip (250) is arranged on the side away from the sensor shell (100), a Hall chip pin (251) is arranged on the Hall chip (250), a pin hole (410) is arranged on the printed circuit board (400) corresponding to the Hall chip pin (251), the diameter of the pin hole (410) is adapted to the diameter of the Hall chip pin (251), one end of the Hall chip pin (251) is connected to the Hall chip (250), and the other end of the Hall chip pin (251) passes through the pin hole (410).

5. A current sensor according to claim 2, wherein, The first support part (230) is fixedly arranged on the side away from the magnetic core (300), and a chip groove (231) is arranged in the first support part (230), a Hall chip (250) is inserted into the chip groove (231), the Hall chip (250) is arranged on the side away from the sensor shell (100), a Hall chip pin (251) is arranged on the Hall chip (250), a pin hole (410) is arranged on the printed circuit board (400) corresponding to the Hall chip pin (251), the diameter of the pin hole (410) is adapted to the diameter of the Hall chip pin (251), one end of the Hall chip pin (251) is connected to the Hall chip (250), and the other end of the Hall chip pin (251) passes through the pin hole (410). The first support part (230) is fixedly arranged on the side away from the magnetic core (300), and a chip groove (231) is arranged in the first support part (230), a Hall chip (250) is inserted into the chip groove (231), the Hall chip (250) is arranged on the side away from the sensor shell (100), a Hall chip pin (251) is arranged on the Hall chip (250), a pin hole (410) is arranged on the printed circuit board (400) corresponding to the Hall chip pin (251), the diameter of the pin hole (410) is adapted to the diameter of the Hall chip pin (251), one end of the Hall chip pin (251) is connected to the Hall chip (250), and the other end of the Hall chip pin (251) passes through the pin hole (410).

6. A current sensor according to claim 5, wherein, The distance between the positioning protrusions (234) on the two corresponding surfaces is 1.4 mm, and the width of the Hall chip (250) is 1.2 mm.

7. A current sensor according to claim 5, wherein The positioning crossbeam (220) is located below the middle position of the bottom of the chip slot (231).

8. The current sensor of claim 1, wherein, The center axis of the positioning crossbeam (220) in the horizontal direction passes through the center of the bottom surface of the magnetic core sheath (200).

9. The current sensor of claim 1, wherein, A plurality of magnetic core buckles (270) are arranged in the magnetic core slot (210) near one side of the sensor shell (100).

10. The current sensor of claim 1, wherein, The sensor shell (100) is a hollow ring structure, a through hole (450) is arranged at the center of the printed circuit board (400), and the inner diameter of the sensor shell (100) is adapted to the inner diameter of the magnetic core sheath (200) and the diameter of the through hole (450).

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