Current sensor for switching power supply

Abstract

The utility model provides a current sensor for a switching power supply, which is characterized in that a shell comprises an upper shell and a lower shell, a framework comprises an upper framework and a lower framework, a magnetic core comprises a left magnetic core and a right magnetic core, the inner walls of the upper shell and the lower shell are respectively provided with a fixing block, the outer walls of the upper shell and the lower shell are respectively provided with a clamping block, and a current rod comprises a first current rod and a second current rod. A first framework hole and a second framework hole are formed in the upper framework and the lower framework respectively, the left magnetic core comprises a first magnetic core inserting plate and a first magnetic core fixing cylinder, the right magnetic core comprises a second magnetic core inserting plate and a second magnetic core fixing cylinder, the magnetic probe comprises an inserting strip and a probe, one side face of the upper framework and one side face of the lower framework are provided with inserting pins, and the PCBA comprises a PCB and a 4pin direct-inserting connector. The 4-pin direct-insertion connector is welded on the PCB in a patch mode, through the design of canceling a buckle, the mold cost can be effectively saved in the machining process, the internal space is effectively saved, and through canceling a customized connector, the problem of customization is solved, and the problem of space occupation is also solved.

Description

Technical Field

[0001] The utility model is a current sensor for a switching power supply, which is applied to industrial fields such as switching power supplies, uninterruptible power supplies, inverters, generators, welding application power supplies, etc. Background Art

[0002] A current sensor is a detection device that can sense the information of the measured current and convert the sensed information into an electrical signal or other required form of information output that meets certain standards according to certain rules to meet the requirements of information transmission, processing, storage, display, recording and control.

[0003] Current sensors, also known as magnetic sensors, can be used in home appliances, smart grids, electric vehicles, wind power generation, etc. There are many magnetic sensors used in our lives, such as computer hard drives, compasses, home appliances, etc.

[0004] The existing series of current sensors for switching power supplies have the following structural design disadvantages:

[0005] Due to the client's usage scenario requirements, such sensors are generally small in size, resulting in very limited internal space;

[0006] The existing switch power supply current sensor has many buckles, occupies more internal space, and has high mold costs;

[0007] The existing switching power supply current sensor takes up a lot of space in PCBA installation;

[0008] The connectors used in existing switching power supply current sensors need to be customized, which increases costs. Utility Model Content

[0009] In order to solve the above technical problems, the utility model proposes a current sensor for a switching power supply. By eliminating the buckle design, it can effectively save mold costs and internal space during processing. By eliminating the customized connector, it solves both the customization problem and the space occupation problem.

[0010] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0011] A current sensor for a switching power supply, characterized in that it includes a shell, a frame, a magnetic core, a current rod, a magnetic probe and a PCBA, the shell includes an upper shell and a lower shell, the frame includes an upper frame and a lower frame, the magnetic core includes a left magnetic core and a right magnetic core, the inner walls of the upper shell and the lower shell are respectively provided with fixing blocks, the outer walls are provided with clamping blocks, and clamping grooves are formed between adjacent clamping blocks, the current rod includes a first current rod and a second current rod, the two ends of the first current rod are respectively fixed in the fixing blocks and are arranged through the fixing blocks, the second current rod is respectively fixed in the clamping grooves on the outer walls of the upper shell and the lower shell, the first current rod is connected to the second current rod,

[0012] The upper frame and the lower frame are fixed on the upper end surface and the lower end surface of the fixing block respectively, and the upper frame and the lower frame are respectively provided with a first frame hole and a second frame hole along the length direction thereof.

[0013] The left magnetic core includes a first magnetic core plug-in plate and a first magnetic core fixing cylinder, and the right magnetic core includes a second magnetic core plug-in plate and a second magnetic core fixing cylinder, the first magnetic core plug-in plate and the second magnetic core plug-in plate are respectively inserted into the first skeleton hole, and the first magnetic core fixing cylinder and the second magnetic core fixing cylinder are respectively inserted into the second skeleton hole.

[0014] The magnetic probe comprises an insert and a probe connected to one end of the insert, wherein the insert is sequentially inserted into the first magnetic core fixing cylinder, the second skeleton hole and the second magnetic core fixing cylinder.

[0015] A pin is provided on one side of the upper frame and the lower frame, the PCBA includes a PCB board and a 4-pin straight plug connector, the 4-pin straight plug connector patch is welded on the PCB board, the PCB board is located on one side of the first frame hole, the second frame hole and the probe, and the pin and the probe are respectively fixed on the PCB board.

[0016] In the above structure: the utility model proposes a current sensor for a switching power supply, comprising a shell, a frame, a magnetic core, a current rod, a magnetic probe and a PCBA, wherein the shell comprises an upper shell and a lower shell, the frame comprises an upper frame and a lower frame, the magnetic core comprises a left magnetic core and a right magnetic core,

[0017] In the prior art, four buckles are provided on both sides of the shell. This design firstly takes up a lot of installation space, which makes it impossible to fix the magnetic parts and electronic components inside the product. Secondly, too many buckles will increase the overall mold cost and make the structure more complicated. Thirdly, since the wall thickness is very thin, making buckles on it will cause the back of the plastic wall to shrink, that is, "buckle marks" will affect the appearance. Therefore, this application cancels the design of four buckles, which can not only increase the internal space, but also make the appearance more beautiful.

[0018] Since the present application does not have the snap-fit ​​structure of the prior art, fixing blocks are respectively provided on the inner walls of the upper shell and the lower shell, and clamping blocks are provided on the outer walls, and clamping grooves are formed between adjacent clamping blocks. The current rod includes a first current rod and a second current rod, and both ends of the first current rod are respectively fixed in the fixing blocks and are arranged through the fixing blocks, and the second current rod is respectively fixed in the clamping grooves on the outer walls of the upper shell and the lower shell, so as to fix the current rod. While the current rod is fastened and does not shake, the fixing blocks on the upper and lower shells are also tightly fixed, thereby achieving fixation between the two shells.

[0019] In the prior art, the PCBA is installed from top to bottom, which occupies a large area and the number of winding coils becomes extremely limited. Therefore, the design of the present application adjusts the PCBA to the side of the frame.

[0020] Since the PCBA is adjusted to the side of the frame, the upper frame and the lower frame are respectively provided with a first frame hole and a second frame hole along the length direction thereof, that is, the first frame hole and the second frame hole penetrating through the side of the upper frame and the lower frame are provided, wherein the left magnetic core includes a first magnetic core plug-in plate and a first magnetic core fixing cylinder, and the right magnetic core includes a second magnetic core plug-in plate and a second magnetic core fixing cylinder, the first magnetic core plug-in plate and the second magnetic core plug-in plate are respectively inserted in the first frame hole, and the first magnetic core fixing cylinder and the second magnetic core fixing cylinder are respectively inserted in the second frame hole, so as to realize the fixed connection between the left magnetic core and the right magnetic core, and the magnetic probe includes an insert strip and a probe connected to one end of the insert strip, the insert strip is sequentially inserted in the first magnetic core fixing cylinder, the second frame hole and the second magnetic core fixing cylinder, a pin is provided on one side of the upper frame and the lower frame, the PCB board is located on one side of the first frame hole, the second frame hole and the probe, so as to facilitate the pin and the probe to be fixed on the PCB board respectively, and by adjusting the PCBA to the side of the frame, the welding of the magnetic probe is more convenient, no secondary welding is required, and very little space is occupied.

[0021] The connectors of existing products are customized parts and need to be re-molded and injected, and have poor fluidity. Therefore, the PCBA designed in this application includes a PCB board and a 4-pin straight-plug connector, and the 4-pin straight-plug connector is patch-welded on the PCB board. Since the PCB of this application is improved to the side, the standard 4-pin straight-plug connector commonly used in the market can be used for patch welding, which can not only solve the problem of the need to customize the connector, but also solve the problem of space occupancy.

[0022] Further: the fixed block includes a first fixed block and a second fixed block, the first fixed block and the second fixed block are respectively fixed relatively to the inner walls of the upper shell and the lower shell, and fixing holes are respectively opened along the cross-sectional direction of the first fixed block and the second fixed block, the two ends of the first current rod are respectively fixed in the fixing holes, and the two ends of the first current rod are respectively connected to the second current rod.

[0023] In the above structure: the fixing block is used to fix the first current bar, and two fixing blocks are provided, namely the first fixing block and the second fixing block. The first fixing block and the second fixing block are relatively fixed on the inner walls of the upper shell and the lower shell respectively, so as to facilitate the fixing of the first current bar. Fixing holes are respectively opened along the cross-sectional directions of the first fixing block and the second fixing block, and the two ends of the first current bar are respectively fixed in the fixing holes, so as to fix the first current bar, and the two ends of the first current bar are respectively connected to the second current bar.

[0024] Further: the clamping block includes a first clamping block and a second clamping block, the first clamping block and the second clamping block are respectively fixed on the outer walls of the upper shell and the lower shell, a first clamping groove is formed between adjacent first clamping blocks, and a second clamping groove is formed between adjacent second clamping blocks, the second current bar is respectively fixed in the first clamping groove and the second clamping groove, and the second current bar is connected to the two ends of the first current bar.

[0025] In the above structure: the clamping block is used to fix the second current bar. Two clamping blocks are provided, namely the first clamping block and the second clamping block. The first clamping block and the second clamping block are respectively fixed on the outer walls of the upper shell and the lower shell, respectively, to facilitate the fixation of the second current bar. A first clamping groove is formed between adjacent first clamping blocks, and a second clamping groove is formed between adjacent second clamping blocks. The second current bar is respectively fixed in the first clamping groove and the second clamping groove, to fix the second current bar. The second current bar is connected to the two ends of the first current bar.

[0026] Further: the upper frame includes an upper bone body, a first frame hole is opened along the length direction of the upper bone body, and the two ends of the upper bone body are respectively provided with a first plate body and a second plate body, a snap plate is fixedly connected to the lower end surface of the first plate body, and the pin is fixed on the second plate body; the lower frame includes a lower bone body, a second frame hole is opened along the length direction of the lower bone body, and the two ends of the lower bone body are respectively provided with a third plate body and a fourth plate body, and a snap groove is opened along the height direction of the third plate body, and the pin is fixed on the fourth plate body. When the upper frame and the lower frame are respectively placed on the upper and lower end surfaces of the fixing block, the snap plate is snapped into the snap groove to fix the upper frame and the lower frame.

[0027] In the above structure: the upper frame includes an upper bone body, the lower frame includes a lower bone body, the first frame hole and the second frame hole are respectively opened on the upper bone body and the lower bone body, the first plate body and the third plate body are arranged correspondingly up and down, and the second plate body and the fourth plate body are arranged correspondingly up and down. During installation, the fixation between the upper frame and the lower frame is achieved by the snap plate on the lower end face of the first plate body and the snap groove on the third plate body.

[0028] Further: a cover plate is also provided on the second plate body, and the cover plate is located above the first skeleton hole; a top plate is provided on the fourth plate body, and the top plate is located above the second skeleton hole; when the upper skeleton and the lower skeleton are respectively placed on the upper and lower end surfaces of the fixed block, the second magnetic core plug-in plate on the right magnetic core is located between the cover plate and the top plate.

[0029] In the above structure: the second magnetic core plug-in plate is fixed by the cover plate on the second plate body and the top plate on the fourth plate body. When the upper frame and the lower frame are respectively placed on the upper and lower end surfaces of the fixing block, the second magnetic core plug-in plate on the right magnetic core is located between the cover plate and the top plate, thereby further fixing the second magnetic core plug-in plate.

[0030] Furthermore: a support plate is also provided on the fourth plate body, and the support plate is located below the second skeleton hole. When the second magnetic core fixing tube on the right magnetic core is inserted into the second skeleton tube, half of the second magnetic core fixing tube is located on the support plate, and the other half is located in the second skeleton hole.

[0031] In the above structure: the support plate is used to support the second magnetic core fixing cylinder, making it convenient to install and fix it.

[0032] Compared with the prior art, the beneficial effects of the utility model are:

[0033] The utility model eliminates the buckle design and fixes the current rod through the clamping groove, which can effectively save mold costs during processing, and can not only increase the internal space but also make the appearance more beautiful.

[0034] The utility model adjusts the PCBA to the side of the frame, so the welding of the magnetic probe is more convenient, no secondary welding is required, and very little space is occupied.

[0035] The utility model solves both the customization problem and the space occupation problem by eliminating the customized connector.

[0036] Since the utility model eliminates the snap structure existing in the prior art, the present application adds a snap plate and a snap groove at the installation position of the current rod, which not only fastens the current rod to prevent it from shaking, but also tightly fixes the fixing blocks on the upper and lower shells, thereby achieving the fixation of the two shells. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is an exploded view of the utility model;

[0038] Figure 2 This is a schematic diagram of the installation of the upper frame and the lower frame in the utility model;

[0039] Figure 3 It is a three-dimensional diagram of the utility model;

[0040] Figure 4 It is the front view of the utility model;

[0041] Figure 5 It is a side view of the utility model.

[0042] List of reference numerals:

[0043] 1. Upper shell; 11. Fixing block; 12. Clamping block; 2. Upper frame; 21. Upper frame body; 22. First plate body; 23. Second plate body; 24. First frame hole; 25. Pin; 26. Snap plate; 27. Cover plate; 3. Left magnetic core; 31. First magnetic core plug-in board; 32. First magnetic core fixing cylinder; 4. Current rod; 41. First current rod; 42. Second current rod; 5. Right magnetic core; 51. Second magnetic core plug-in board; 52. Second magnetic core fixing cylinder; 6. Magnetic probe; 61. Insert strip; 62. Probe; 7. PCBA; 71. PCB board; 72. 4-pin straight plug connector; 8. Lower frame; 81. Lower frame body; 82. Third plate body; 83. Fourth plate body; 84. Second frame hole; 85. Snap groove; 86. Top plate; 87. Support plate; 9. Lower shell. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:

[0045] like Figure 1-5 As shown, the utility model proposes a current sensor for a switching power supply, including a shell, a skeleton, a magnetic core, a current bar 4, a magnetic probe 6 and a PCBA 7, the shell includes an upper shell 1 and a lower shell 9, the skeleton includes an upper skeleton 2 and a lower skeleton 8, the magnetic core includes a left magnetic core 3 and a right magnetic core 5, the inner walls of the upper shell 1 and the lower shell 9 are respectively provided with fixing blocks 11, the outer walls are provided with clamping blocks 12, and clamping grooves are formed between adjacent clamping blocks 12, the current bar 4 includes a first current bar 41 and a second current bar 42, the two ends of the first current bar 41 are respectively fixed in the fixing block 11 and are arranged through the fixing block 11, the second current bar 42 is respectively fixed in the clamping grooves on the outer walls of the upper shell 1 and the lower shell 9, the first current bar 41 is connected to the second current bar 42,

[0046] The upper frame 2 and the lower frame 8 are fixed to the upper end surface and the lower end surface of the fixing block 11 respectively. The upper frame 2 and the lower frame 8 are respectively provided with a first frame hole 24 and a second frame hole 84 along their length direction.

[0047] The left magnetic core 3 includes a first magnetic core plug-in plate 31 and a first magnetic core fixing cylinder 32, and the right magnetic core 5 includes a second magnetic core plug-in plate 51 and a second magnetic core fixing cylinder 52. The first magnetic core plug-in plate 31 and the second magnetic core plug-in plate 51 are respectively inserted into the first skeleton hole 24, and the first magnetic core fixing cylinder 32 and the second magnetic core fixing cylinder 52 are respectively inserted into the second skeleton hole 84.

[0048] The magnetic probe 6 includes an insert 61 and a probe 62 connected to one end of the insert 61. The insert 61 is inserted into the first magnetic core fixing cylinder 32, the second skeleton hole 84 and the second magnetic core fixing cylinder 52 in sequence.

[0049] A pin 25 is provided on one side of the upper frame 2 and the lower frame 8, and the PCBA7 includes a PCB board 71 and a 4-pin straight plug connector 72. The 4-pin straight plug connector 72 is patch-welded on the PCB board 71. The PCB board 71 is located on one side of the first frame hole 24, the second frame hole 84 and the probe 62, and the pin 25 and the probe 62 are respectively fixed on the PCB board 71.

[0050] The utility model proposes a current sensor for a switching power supply, comprising a shell, a frame, a magnetic core, a current rod 4, a magnetic probe 6 and a PCBA 7, wherein the shell comprises an upper shell 1 and a lower shell 9, the frame comprises an upper frame 2 and a lower frame 8, and the magnetic core comprises a left magnetic core 3 and a right magnetic core 5.

[0051] In the prior art, four buckles are provided on both sides of the shell. This design firstly takes up a lot of installation space, which makes it impossible to fix the magnetic parts and electronic components inside the product. Secondly, too many buckles will increase the overall mold cost and make the structure more complicated. Thirdly, since the wall thickness is very thin, making buckles on it will cause the back of the plastic wall to shrink, that is, "buckle marks" will affect the appearance. Therefore, this application cancels the design of four buckles, which can not only increase the internal space, but also make the appearance more beautiful.

[0052] Since the present application does not have a snap-fit ​​structure in the prior art, a fixing block 11 is respectively provided on the inner wall of the upper shell 1 and the lower shell 9, and a clamping block 12 is provided on the outer wall, and a clamping groove is formed between adjacent clamping blocks 12. The current bar 4 includes a first current bar 41 and a second current bar 42. Both ends of the first current bar 41 are respectively fixed in the fixing block 11 and are arranged through the fixing block 11. The second current bar 42 is respectively fixed in the clamping grooves on the outer walls of the upper shell 1 and the lower shell 9, so as to fix the current bar 4. While the current bar 4 is fastened and does not shake, the fixing blocks 11 on the upper and lower shells 9 are also tightly fixed, thereby achieving fixation between the two shells.

[0053] In the prior art, PCBA7 is installed from top to bottom, which occupies a large area and the number of winding coils becomes extremely limited. Therefore, the design of this application adjusts PCBA7 to the side of the frame.

[0054] Since PCBA7 is adjusted to the side of the frame, the upper frame 2 and the lower frame 8 are respectively provided with a first frame hole 24 and a second frame hole 84 along their length direction, that is, the first frame hole 24 and the second frame hole 84 are provided on the side of the upper frame 2 and the lower frame 8, wherein the left magnetic core 3 includes a first magnetic core plug-in plate 31 and a first magnetic core fixing cylinder 32, and the right magnetic core 5 includes a second magnetic core plug-in plate 51 and a second magnetic core fixing cylinder 52, the first magnetic core plug-in plate 31 and the second magnetic core plug-in plate 51 are respectively inserted into the first frame hole 24, and the first magnetic core fixing cylinder 32 and the second magnetic core fixing cylinder 52 are respectively inserted into the second frame hole 84, The left magnetic core 3 and the right magnetic core 5 are now fixedly connected, and the magnetic probe 6 includes an insertion strip 61 and a probe 62 connected to one end of the insertion strip 61. The insertion strip 61 is inserted into the first magnetic core fixing tube 32, the second skeleton hole 84 and the second magnetic core fixing tube 52 in sequence. A pin 25 is provided on one side of the upper skeleton 2 and the lower skeleton 8. The PCB board 71 is located on one side of the first skeleton hole 24, the second skeleton hole 84 and the probe 62, so that the pin 25 and the probe 62 are fixed on the PCB board 71 respectively. By adjusting the PCBA7 to the side of the skeleton, the welding of the magnetic probe 6 is more convenient, no secondary welding is required, and very little space is occupied.

[0055] The connectors of existing products are customized parts and need to be re-molded and injected, and have poor fluidity. Therefore, the PCBA7 designed in this application includes a PCB board 71 and a 4-pin straight plug connector 72. The 4-pin straight plug connector 72 is patch-welded on the PCB board 71. Since the PCB of this application is improved to the side, the standard 4-pin straight plug connector 72 commonly used in the market can be used for patch welding, which can solve the problem of the need to customize the connector and the problem of space occupation.

[0056] In this embodiment: the fixing block 11 includes a first fixing block and a second fixing block, the first fixing block and the second fixing block are relatively fixed on the inner wall of the upper shell 1 and the lower shell 9, respectively, fixing holes are respectively opened along the cross-sectional direction of the first fixing block and the second fixing block, the two ends of the first current bar 41 are respectively fixed in the fixing holes, and the two ends of the first current bar 41 are respectively connected to the second current bar 42. The fixing block 11 is used to fix the first current bar 41. The fixing block 11 is provided with two, namely the first fixing block and the second fixing block. The first fixing block and the second fixing block are relatively fixed on the inner wall of the upper shell 1 and the lower shell 9, respectively, to facilitate the fixing of the first current bar 41. Fixing holes are respectively opened along the cross-sectional direction of the first fixing block and the second fixing block, the two ends of the first current bar 41 are respectively fixed in the fixing holes, to fix the first current bar 41, and the two ends of the first current bar 41 are respectively connected to the second current bar 42.

[0057] In this embodiment: the clamping block 12 includes a first clamping block and a second clamping block, the first clamping block and the second clamping block are respectively fixed on the outer wall of the upper shell 1 and the lower shell 9, a first clamping groove is formed between adjacent first clamping blocks, a second clamping groove is formed between adjacent second clamping blocks, the second current bar 42 is respectively fixed in the first clamping groove and the second clamping groove, and the second current bar 42 is connected to both ends of the first current bar 41. The clamping block 12 is used to fix the second current bar 42, and the clamping block 12 is provided with two, namely the first clamping block and the second clamping block, the first clamping block and the second clamping block are respectively fixed on the outer wall of the upper shell 1 and the lower shell 9, to facilitate the fixation of the second current bar 42, a first clamping groove is formed between adjacent first clamping blocks, a second clamping groove is formed between adjacent second clamping blocks, the second current bar 42 is respectively fixed in the first clamping groove and the second clamping groove, to fix the second current bar 42, and the second current bar 42 is connected to both ends of the first current bar 41.

[0058] In this embodiment: the upper frame 2 includes an upper frame body 21, and a first frame hole 24 is opened along the length direction of the upper frame body 21. The two ends of the upper frame body 21 are respectively provided with a first plate body 22 and a second plate body 23. A snap plate 26 is fixedly connected to the lower end surface of the first plate body 22, and the pin 25 is fixed on the second plate body 23. The lower frame 8 includes a lower frame body 81, and a second frame hole 84 is opened along the length direction of the lower frame body 81. The two ends of the lower frame body 81 are respectively provided with a third plate body 82 and a fourth plate body 83, and a snap groove 85 is opened along the height direction of the third plate body 82. The pin 25 is fixed on the fourth plate body 83. When the upper frame 2 and the lower frame 8 are respectively placed on the upper and lower end surfaces of the fixing block 11, the snap plate 26 is snapped into the snap groove 85 to fix the upper frame 2 and the lower frame 8. The upper frame 2 includes an upper bone body 21, and the lower frame 8 includes a lower bone body 81. The first frame hole 24 and the second frame hole 84 are respectively opened on the upper bone body 21 and the lower bone body 81. The first plate body 22 and the third plate body 82 are arranged correspondingly up and down, and the second plate body 23 and the fourth plate body 83 are arranged correspondingly up and down. During installation, the fixation between the upper frame 2 and the lower frame 8 is achieved by the snap plate 26 on the lower end surface of the first plate body 22 and the snap groove 85 on the third plate body 82.

[0059] In this embodiment: the second plate body 23 is further provided with a cover plate 27, the cover plate 27 is located above the first skeleton hole 24, the fourth plate body 83 is provided with a top plate 86, the top plate 86 is located above the second skeleton hole 84, when the upper skeleton 2 and the lower skeleton 8 are respectively placed on the upper and lower end surfaces of the fixing block 11, the second magnetic core plug-in plate 51 on the right magnetic core 5 is located between the cover plate 27 and the top plate 86. The second magnetic core plug-in plate 51 is fixed by the cover plate 27 on the second plate body 23 and the top plate 86 on the fourth plate body 83, when the upper skeleton 2 and the lower skeleton 8 are respectively placed on the upper and lower end surfaces of the fixing block 11, the second magnetic core plug-in plate 51 on the right magnetic core 5 is located between the cover plate 27 and the top plate 86, thereby realizing further fixing of the second magnetic core plug-in plate 51.

[0060] In this embodiment: a support plate 87 is further provided on the fourth plate body 83, and the support plate 87 is located below the second frame hole 84. When the second magnetic core fixing cylinder 52 on the right magnetic core 5 is inserted into the second frame cylinder, half of the second magnetic core fixing cylinder 52 is located on the support plate 87, and the other half is located in the second frame hole 84. The support plate 87 is used to support the second magnetic core fixing cylinder 52, so that it is convenient to install and fix.

[0061] The utility model eliminates the buckle design and fixes the current rod 4 through the clamping groove, which can effectively save mold costs during processing, increase the internal space, and make the appearance more beautiful.

[0062] The utility model adjusts the PCBA 7 to the side of the frame, so that the welding of the magnetic probe 6 is more convenient, no secondary welding is required, and very little space is occupied.

[0063] The utility model solves both the customization problem and the space occupation problem by eliminating the customized connector.

[0064] Since the present invention eliminates the snap-fit ​​structure existing in the prior art, the present invention adds a snap-fit ​​plate 26 and a snap-fit ​​groove 85 at the installation position of the current bar 4, which not only fastens the current bar 4 to prevent it from shaking, but also tightly fixes the fixing blocks 11 on the upper and lower shells 9, thereby achieving the fixation of the two shells.

[0065] The above is only a preferred embodiment of the present invention and does not constitute any other limitation on the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A current sensor for a switching power supply, characterized in that: The invention comprises a shell, a frame, a magnetic core, a current bar (4), a magnetic probe (6) and a PCBA (7), wherein the shell comprises an upper shell (1) and a lower shell (9), the frame comprises an upper frame (2) and a lower frame (8), the magnetic core comprises a left magnetic core (3) and a right magnetic core (5), the inner walls of the upper shell (1) and the lower shell (9) are respectively provided with fixing blocks (11), the outer walls are provided with clamping blocks (12), and clamping grooves are formed between adjacent clamping blocks (12), the current bar (4) comprises a first current bar (41) and a second current bar (42), the two ends of the first current bar (41) are respectively fixed in the fixing blocks (11) and are arranged through the fixing blocks (11), the second current bar (42) is respectively fixed in the clamping grooves on the outer walls of the upper shell (1) and the lower shell (9), the first current bar (41) is connected to the second current bar (42), The upper frame (2) and the lower frame (8) are fixed to the upper end surface and the lower end surface of the fixing block (11) respectively, and the upper frame (2) and the lower frame (8) are respectively provided with a first frame hole (24) and a second frame hole (84) along their length direction. The left magnetic core (3) comprises a first magnetic core plug-in plate (31) and a first magnetic core fixing cylinder (32), and the right magnetic core (5) comprises a second magnetic core plug-in plate (51) and a second magnetic core fixing cylinder (52), the first magnetic core plug-in plate (31) and the second magnetic core plug-in plate (51) are respectively inserted into the first skeleton hole (24), and the first magnetic core fixing cylinder (32) and the second magnetic core fixing cylinder (52) are respectively inserted into the second skeleton hole (84). The magnetic probe (6) comprises an insert (61) and a probe (62) connected to one end of the insert (61), wherein the insert (61) is sequentially inserted into the first magnetic core fixing cylinder (32), the second skeleton hole (84) and the second magnetic core fixing cylinder (52). A plug pin (25) is provided on one side of the upper frame (2) and the lower frame (8); the PCBA (7) comprises a PCB board (71) and a 4-pin straight plug connector (72); the 4-pin straight plug connector (72) is patch-welded on the PCB board (71); the PCB board (71) is located on one side of the first frame hole (24), the second frame hole (84) and the probe (62); the plug pin (25) and the probe (62) are respectively fixed on the PCB board (71).

2. A current sensor for a switching power supply according to claim 1, characterized in that: The fixing block (11) comprises a first fixing block and a second fixing block, the first fixing block and the second fixing block are respectively fixed relatively to the inner walls of the upper shell (1) and the lower shell (9), fixing holes are respectively opened along the cross-sectional direction of the first fixing block and the second fixing block, the two ends of the first current bar (41) are respectively fixed in the fixing holes, and the two ends of the first current bar (41) are respectively connected to the second current bar (42).

3. A current sensor for a switching power supply according to claim 1, characterized in that: The clamping block (12) comprises a first clamping block and a second clamping block, the first clamping block and the second clamping block are respectively fixed on the outer walls of the upper shell (1) and the lower shell (9), a first clamping groove is formed between adjacent first clamping blocks, and a second clamping groove is formed between adjacent second clamping blocks, the second current bar (42) is respectively fixed in the first clamping groove and the second clamping groove, and the second current bar (42) is connected to the two ends of the first current bar (41).

4. A current sensor for a switching power supply according to claim 1, characterized in that: The upper frame (2) comprises an upper frame body (21), a first frame hole (24) is opened along the length direction of the upper frame body (21), the two ends of the upper frame body (21) are respectively provided with a first plate body (22) and a second plate body (23), a snap plate (26) is fixedly connected to the lower end surface of the first plate body (22), the pin (25) is fixed on the second plate body (23), the lower frame (8) comprises a lower frame body (81), a first frame hole (24) is opened along the length direction of the lower frame body (81), Two frame holes (84), the two ends of the lower frame (81) are respectively provided with a third plate body (82) and a fourth plate body (83), a snap groove (85) is opened along the height direction of the third plate body (82), the pin (25) is fixed on the fourth plate body (83), when the upper frame (2) and the lower frame (8) are respectively placed on the upper and lower end surfaces of the fixing block (11), the snap plate (26) is snapped into the snap groove (85) to fix the upper frame (2) and the lower frame (8).

5. A current sensor for a switching power supply according to claim 4, characterized in that: The second plate body (23) is also provided with a cover plate (27), and the cover plate (27) is located above the first skeleton hole (24). The fourth plate body (83) is provided with a top plate (86), and the top plate (86) is located above the second skeleton hole (84). When the upper skeleton (2) and the lower skeleton (8) are respectively placed on the upper and lower end surfaces of the fixed block (11), the second magnetic core plug plate (51) on the right magnetic core (5) is located between the cover plate (27) and the top plate (86).

6. A current sensor for a switching power supply according to claim 4, characterized in that: A support plate (87) is also provided on the fourth plate body (83), and the support plate (87) is located below the second skeleton hole (84). When the second magnetic core fixing tube (52) on the right magnetic core (5) is inserted into the second skeleton tube, half of the second magnetic core fixing tube (52) is located on the support plate (87) and the other half is located in the second skeleton hole (84).

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