Current sensor

Abstract

The utility model relates to the technical field of current sensors, in particular to a current sensor, which comprises a shell and an upper cover, a PCB (printed circuit board) and an iron core are mounted in the shell, a chip is welded on the PCB, the chip is positioned in a notch of the iron core, and the iron core is of an annular plate structure and is used for providing a planar mounting position for a positioning sheet; the chip is an octagonal patch chip, so that the stress stability during welding is improved, and shaking is avoided; the PCB is defined as an induction PCB, and the induction PCB is connected with a client terminal through a transfer terminal and an adapter PCB; the iron core is of an annular plate structure, the upper end and the lower end of the iron core are both of a plane structure which is different from a circular ring structure in the prior art, a plane installation position is provided for the positioning piece, the positioning piece can be conveniently welded to the surface of the iron core, and the requirement for the welding process is lowered; by means of the arrangement, the technical problems that in the prior art, a welding positioning piece is not prone to positioning, the chip precision is low, and the cost is high are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of current sensors, in particular to a current sensor. Background Art

[0002] The function of the 80A current sensor is to measure the current in the circuit in real time. It has the characteristics of high precision, high isolation, wide frequency response, low drift, low power consumption, wide temperature range and strong anti-interference ability.

[0003] The structure of the traditional 80A current sensor can refer to Figure 1 The current sensor includes a housing 6 and an upper cover 7. During installation, the chip 1 is soldered to the PCB board 2 and fixed to the corresponding position of the housing 6 through the slot 3. The fisheye terminal 4 is first pressed into the mounting hole 5 of the housing 6 along the D direction using a special tool. While continuing to press, the side tool is used to limit the position in the A direction to ensure that the end 8 of the fisheye terminal 4 can be pressed into the hole of the PCB board 2. The positioning piece 10 on the iron core 9 is pressed in the A direction through the positioning reference part 11 of the housing 6 to assemble the iron core assembly (iron core 9 and positioning piece 10) in place, and at the same time, the chip 1 is located in the notch 12 of the iron core 9. Finally, the upper cover 7 is installed on the upper part of the housing 6, and the two are melted together using ultrasonic equipment to form the product.

[0004] In actual use, the above-mentioned current sensor still has certain shortcomings: 1) The existing 80A current sensor has a weak induced magnetic field, and the size of the iron core air gap must be small enough to meet the accuracy of the chip's induction of the entire iron core magnetic field when current passes through; 2) The chip needs to be in the middle position of the iron core gap, and the relative position of the gap needs to be guaranteed when the iron core is assembled. The existing iron core is a circular ring structure with a circular axial cross-sectional area and a smooth outer periphery. The welding positioning piece is not easy to position, and the welding process has high requirements; 3) The existing chip's three-legged single-sided welding is unbalanced, and there is a risk of shaking during vibration. The chip will be offset in the gap position of the iron core, which may cause the risk of reduced chip accuracy; 4) The PCB and the client terminal are connected in the form of fisheye terminals, which is costly; 5) The upper cover and the shell are fixed by ultrasonic welding, and the ultrasonic line design and process requirements of the upper cover and the shell are high. Utility Model Content

[0005] The utility model provides a current sensor to solve the technical problems in the prior art such as difficulty in positioning a welding positioning piece, low chip precision and high cost.

[0006] To solve the above problems, the current sensor provided by the present invention adopts the following technical solutions:

[0007] The current sensor includes a housing and an upper cover. A PCB and an iron core are installed in the housing. A chip is welded on the PCB and located in a notch of the iron core. The iron core is a ring plate structure to provide a flat mounting position for the positioning piece.

[0008] The chip is an octagonal patch chip to improve the stress stability during welding and avoid shaking;

[0009] The PCB board is defined as a sensing PCB board, and the sensing PCB board is connected to the client terminal through the transfer terminal and the adapter PCB board.

[0010] The current sensor provided by the present invention has the following beneficial effects: 1) The iron core adopts a ring plate structure, with both upper and lower ends being planar structures, which is different from the circular ring structure of the prior art. This provides a flat mounting position for the positioning piece, which can be conveniently welded to the surface of the iron core, reducing the requirements for the welding process; 2) The chip is changed from the triangular single-sided structure of the prior art to an octagonal patch chip, which increases the number of welding points, improves stability, and reduces the risk of shaking; 3) The transfer terminal and the transfer PCB board are used as transition pieces to achieve the connection between the sensing PCB board and the client terminal, eliminating the need to use press-fit fisheye terminals to achieve the connection between the sensing PCB board and the client terminal, effectively reducing costs;

[0011] In summary, through the above-mentioned configuration, the utility model effectively solves the technical problems existing in the prior art such as difficulty in positioning the welding positioning piece, low chip precision and high cost.

[0012] Furthermore, the positioning piece includes a side plate and an I-shaped plate connecting the side plates. The I-shaped plate includes a middle portion and two side ends. The two side ends are respectively welded to the end faces of the iron core on both sides of the notch.

[0013] Furthermore, the sensor PCB has a latch corresponding to the notch, allowing the sensor PCB to be mounted on both sides of the notch in the core. The chip's octagonal patches are divided into two groups, each with four patches, and the two groups of patches are soldered to either side of the latch. This arrangement provides a more balanced force on the chip, further reducing the risk of shaking.

[0014] Furthermore, the transfer PCB board is horizontally arranged between the sensing PCB board and the client terminal, one end of the transfer PCB board is plugged with a transfer terminal, the transfer terminal is plugged into the sensing PCB board, and the other end is plugged into the client terminal.

[0015] Furthermore, the two sides of the transfer PCB board each have a row of jacks for respectively inserting the transfer terminals and the client terminals.

[0016] Furthermore, the housing has two collinear slots for receiving the sensing PCB to position the sensing PCB.

[0017] Furthermore, the upper cover is made of potting resin, which is directly potted and fixed with resin, which is completely sealed, simple in process and has a high waterproof level. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0019] Figure 1 This is an exploded structural diagram of a current sensor in the prior art;

[0020] Figure 2 This is an overall schematic diagram of the current sensor provided by the utility model;

[0021] Figure 3 A partial schematic diagram of the current sensor provided by the utility model Figure 1 ;

[0022] Figure 4 A partial schematic diagram of the current sensor provided by the utility model Figure 2 ;

[0023] Figure 5 A partial schematic diagram of the current sensor provided by the utility model Figure 3 ;

[0024] Figure 6 This is a schematic diagram of the structure of the induction PCB board in this utility model;

[0025] Figure 7 This is a schematic diagram of the current sensor provided by the present invention (the upper cover is not shown).

[0026] Description of reference numerals:

[0027] 1. Chip; 2. PCB board; 3. Card slot; 4. Fisheye terminal; 5. Mounting hole; 6. Housing; 7. Upper cover; 8. End; 9. Iron core; 10. Positioning piece; 11. Positioning reference part; 12. Notch;

[0028] 101. Shell; 102. Upper cover; 103. Sensor PCB board; 104. Iron core; 105. Notch; 106. Chip; 107. Transfer terminal; 108. Transfer PCB board; 109. Client terminal; 110. Positioning piece; 111. Side panel; 112. Digital board; 113. Bayonet; 114. Jack; 115. Card slot. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0030] It should be noted that the main idea of ​​the present invention is that the iron core 104 adopts a ring plate structure, and both the upper and lower ends thereof are planar structures, which are different from the circular ring structure of the prior art, and provide a flat installation position for the positioning piece 110. The positioning piece 110 can be conveniently welded to the surface of the iron core 104, and the requirements for the welding process are reduced; the chip 106 is changed from the triangular single-sided structure in the prior art to an octagonal patch chip, with more welding points, higher stability, and reduced shaking risk; the transfer terminal 107 and the transfer PCB board 108 are used as transition pieces to realize the connection between the sensing PCB board 103 and the client terminal 109, and there is no need to use the press-fit fisheye terminal method to realize the connection between the sensing PCB board 103 and the client terminal 109, which effectively reduces the cost; so as to solve the technical problems in the prior art that the welding positioning piece 110 is difficult to position, the chip 106 has low precision and high cost.

[0031] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. The numbers of any elements in the drawings are for illustration only and not for limitation, and any names are for distinction only and do not have any limiting meaning.

[0032] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0033] Embodiment 1 of the current sensor provided by the present utility model:

[0034] like Figures 2 to 7As shown, the current sensor includes a shell 101 and an upper cover 102. A PCB board and an iron core 104 are installed in the shell 101. A chip 106 is soldered on the PCB board and is located in a notch 105 of the iron core 104. The iron core 104 is a ring plate structure to provide a flat mounting position for the positioning piece 110. The chip 106 is an octagonal patch chip to improve the force stability during welding and avoid shaking. The PCB board is defined as the sensing PCB board 103, and the sensing PCB board 103 is connected to the client terminal 109 through the transfer terminal 107 and the adapter PCB board 108.

[0035] Regarding the positioning piece 110 , the positioning piece 110 includes a side plate 111 and an I-shaped plate 112 connected to the side plate 111 . The I-shaped plate 112 includes a middle portion and two side ends, and the two side ends are respectively welded to the end faces of the iron core 104 on both sides of the notch 105 .

[0036] The sensor PCB 103 has slots 113 corresponding to the notch 105, allowing the sensor PCB 103 to be mounted on either side of the notch 105 in the core 104. The octagonal patches of the chip 106 are divided into two groups, each with four patches, and the two groups of patches are soldered to either side of the slots 113. This arrangement provides a more balanced force on the chip 106, further reducing the risk of shaking.

[0037] About the transfer PCB board 108. The transfer PCB board 108 is arranged horizontally between the sensing PCB board 103 and the client terminal 109. One end of the transfer PCB board 108 is plugged with the transfer terminal 107, which is plugged into the sensing PCB board 103, and the other end is plugged into the client terminal 109.

[0038] Specifically, a row of jacks 114 are respectively provided on both sides of the transfer PCB board 108 to respectively insert the transfer terminals 107 and the client terminals 109 .

[0039] In addition, the housing 101 has two collinear slots 115 , and the two slots 115 are for receiving the sensing PCB 103 to position the sensing PCB 103 .

[0040] To reduce process complexity, the upper cover 102 is made of potting resin. Directly potting with the resin provides a complete seal, a simple process, and a high waterproof rating. Ultrasonic welding is no longer used, reducing the manufacturing requirements for the housing 101 and upper cover 102.

[0041] The working principle of the current sensor provided by the present invention is as follows: the iron core 104 adopts a ring plate structure, and both the upper and lower ends thereof are planar structures, which is different from the circular ring structure in the prior art, and provides a flat installation position for the positioning piece 110. The positioning piece 110 can be conveniently welded to the surface of the iron core 104, and the requirements for the welding process are reduced; the chip 106 is changed from the triangular single-sided structure in the prior art to an octagonal patch chip, with more welding points, higher stability, and reduced shaking risk; the transfer terminal 107 and the transfer PCB board 108 are used as transition pieces to realize the connection between the sensing PCB board 103 and the client terminal 109, and there is no need to use the press-fit fisheye terminal method to realize the connection between the sensing PCB board 103 and the client terminal 109, which effectively reduces the cost.

[0042] Embodiment 2 of the current sensor provided by the present utility model:

[0043] The main difference between it and Example 1 is:

[0044] In embodiment 1, two collinear slots are provided in the housing, and the two slots are used for placing the sensing PCB board to position the sensing PCB board.

[0045] In this embodiment, the number of card slots can be modified according to actual needs.

[0046] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and other terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings of this specification. They are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0047] In addition, in the description of this specification, “a plurality of” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A current sensor comprising a housing and an upper cover, wherein a PCB and an iron core are mounted in the housing, a chip is soldered onto the PCB, and the chip is located in a notch in the iron core, and is characterized by: The iron core is a ring plate structure, which is used to provide a flat installation position for the positioning piece; The chip is an octagonal patch chip to improve the stress stability during welding and avoid shaking; The PCB board is defined as a sensing PCB board, and the sensing PCB board is connected to the client terminal through the transfer terminal and the adapter PCB board.

2. The current sensor according to claim 1, wherein: The positioning piece includes a side plate and an "X" plate connecting the side plates. The "X" plate includes a middle portion and two side ends. The two side ends are respectively welded to the core end faces on both sides of the notch.

3. The current sensor according to claim 1 or 2, characterized in that: The induction PCB board has a bayonet corresponding to the notch, so that the induction PCB board can be clamped on both sides of the notch of the iron core. The octagonal patches of the chip are divided into two groups, each group has four patches, and the two groups of patches are respectively welded on both sides of the bayonet.

4. The current sensor according to claim 1 or 2, characterized in that: The transfer PCB is horizontally arranged between the sensing PCB and the client terminal. One end of the transfer PCB is plugged with a transfer terminal, which is plugged into the sensing PCB, and the other end is plugged into the client terminal.

5. The current sensor according to claim 4, characterized in that: The two sides of the transfer PCB board are each provided with a row of jacks for respectively inserting the transfer terminals and the client terminals.

6. The current sensor according to claim 4, characterized in that: The housing is provided with two collinear slots for receiving the sensing PCB to position the sensing PCB.

7. The current sensor according to claim 1 or 2, characterized in that: The upper cover is made of potting resin.

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