Leakage current sensor and electronic equipment
By adopting the synergistic effect of the first housing and the lock ring in the leakage current sensor to fix the leakage current sensing module, the measurement risk problem caused by the leakage current sensor relying on the back cover in the prior art is solved, and higher safety and reliability are achieved.
Patent Information
- Application Number
- CN202422107142.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-29
AI Technical Summary
Existing leakage current sensors rely on the rear cover to fix the leakage current sensing module, resulting in high measurement risks.
A leakage current sensor is designed, and the synergistic effect of the first housing and the lock ring is used to fix the leakage current sensing module in the first housing to avoid dependence on the rear cover.
By reducing dependence on the back cover, the measurement risk is reduced and the safety and reliability of the leakage current sensor is improved.
Smart Images
Figure CN223038152U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of leakage current sensors, in particular to a leakage current sensor and an electronic device. Background Art
[0002] In a photovoltaic grid-connected power generation system, an industrial frequency transformer is generally used to isolate between a photovoltaic panel and a power grid to achieve electrical isolation and ensure the safety of the system and personnel.
[0003] To improve system efficiency and reduce system costs, the industrial frequency transformer between the photovoltaic panel and the power grid is often omitted, resulting in the possibility of leakage current in the system, which affects the safety of the system. To further improve the safety of the system, a leakage current detection device is generally provided on a photovoltaic inverter to detect the total (including DC and AC parts) effective value current and continuous residual current, and disconnect and issue a fault signal when the current exceeds the limit.
[0004] The existing leakage current detection device includes a housing, a leakage current sensing module and a rear cover. The leakage current sensing module is placed between the housing and the rear cover. Whether the leakage current sensing module is fixed to the housing often depends on the rear cover. Therefore, the dependence of the leakage current sensing module on the rear cover easily brings measurement risks to its leakage current detection.
[0005] The above content is only used to assist in understanding the technical solution of the utility model, and does not represent an admission that the above content is prior art. Summary of the Utility Model
[0006] The purpose of the utility model is to provide a leakage current sensor and an electronic device to improve the problem of large measurement risks caused by the dependence of the existing leakage current sensor on the rear cover.
[0007] To achieve the above purpose, a first aspect of the utility model proposes a leakage current sensor, which includes:
[0008] A first housing, which includes a channel protrusion and a pin through-hole; the channel protrusion penetrates through the first side surface of the first housing and protrudes away from the first side surface to form a channel for accommodating a wire; the pin through-hole penetrates through the first bottom surface of the first housing perpendicular to the first side surface;
[0009] A leakage current sensing module, which includes a printed circuit board, a magnetic core unit, a signal processing unit and a plurality of pins respectively connected to the printed circuit board; the leakage current sensing module is accommodated in the inner cavity of the first housing; the pins pass through the first housing through the pin through-holes;
[0010] A lock ring, which is respectively connected to the channel protrusion and the printed circuit board and is used to fix the leakage current sensing module to the first housing.
[0011] According to some embodiments of the present utility model, the locking ring includes a channel ring column and a limiting block connected to each other;
[0012] The channel ring column is snap-connected to the channel protrusion, and is used for separating the channel and the inner cavity, and making the limiting block abut against the printed circuit board when the channel ring column is snap-connected to the channel protrusion.
[0013] According to some embodiments of the present utility model, the first housing further includes a plurality of limiting columns; the plurality of limiting columns are perpendicular to the first side surface, and are used for forming a limiting surface to support the first surface of the printed circuit board;
[0014] When the channel ring column is snap-connected to the channel protrusion, the second surface of the printed circuit board opposite to the first surface abuts against the limiting block.
[0015] According to some embodiments of the present utility model, the magnetic core unit includes a coil, an annular magnetic core and a magnetic core mounting seat, the annular magnetic core is mounted on the magnetic core mounting seat, and the coil is wound around the annular magnetic core; the magnetic core mounting seat is insulatingly connected to the printed circuit board.
[0016] According to some embodiments of the present utility model, the magnetic core unit further includes a magnetic core sleeve; the magnetic core sleeve is used for covering the annular magnetic core; the coil is wound around the outer wall of the magnetic core sleeve; the magnetic core sleeve is arranged on the magnetic core mounting seat.
[0017] According to some embodiments of the present utility model, the magnetic core mounting seat includes a plurality of first rivet mounting holes;
[0018] The printed circuit board includes a plurality of second rivet mounting holes matching the first rivet mounting holes;
[0019] The plurality of first rivet mounting holes are respectively connected to the second rivet mounting holes of the printed circuit board through rivets to fixedly connect the printed circuit board and the magnetic core unit;
[0020] The coil is electrically coupled to the signal processing unit through the rivet.
[0021] According to some embodiments of the present utility model, the leakage current sensing module includes N pins, where N is a positive integer greater than 1; the first bottom surface includes N linearly arranged pin through holes.
[0022] According to some embodiments of the present utility model, M pins are located at a first position on the first bottom surface, and N - M pins are located at a second position on the first bottom surface, where M is a positive integer less than N.
[0023] According to some embodiments of the present utility model, the maximum distance between the channel protrusion and the first side surface is less than the distance from the printed circuit board to the first side surface.
[0024] According to some embodiments of the present utility model, the first housing further includes a plurality of insulating blocks for separating the first bottom surface from an external device.
[0025] To achieve the above object, a second aspect of the present utility model provides an electronic device, which includes the above-mentioned leakage current sensor.
[0026] Compared with the prior art, the present utility model has at least the following beneficial effects:
[0027] The present utility model provides a leakage current sensor, which includes a first housing, a leakage current sensing module and a locking ring; the first housing includes a channel protrusion penetrating through the first side surface of the first housing and a pin through hole penetrating through the first bottom surface of the first housing; the leakage current sensing module includes a printed circuit board, a magnetic core unit, a signal processing unit and a plurality of pins respectively connected to the printed circuit board; the pins pass through the first housing through the pin through holes; the locking ring is used to fix the leakage current sensing module to the first housing. Through the cooperative action of the first housing and the locking ring, the leakage current sensor does not rely on the rear cover to fix the leakage current sensing module in the first housing, reducing the measurement risk caused by the rear cover. Description of the Drawings
[0028] Figure 1 It is a schematic structural diagram of the leakage current sensor in an embodiment of the present utility model;
[0029] Figure 2 It is an exploded view of the leakage current sensor in an embodiment of the present utility model;
[0030] Figure 3 It is a schematic structural diagram of the first housing in an embodiment of the present utility model;
[0031] Figure 4 It is another schematic structural diagram of the first housing in an embodiment of the present utility model;
[0032] Figure 5 It is an exploded view of the leakage current sensing module in an embodiment of the present utility model.
[0033] Reference Signs:
[0034] 100 First housing; 110 Channel protrusion; 120 Pin through-hole; 130 Bottom plate protrusion; 140 Limit post; 150 Insulating block; 200 Leakage current sensing module; 210 Printed circuit board; 2101 First rivet through-hole; 220 Magnetic core unit; 221 Toroidal magnetic core; 222 Magnetic core sleeve; 223 Magnetic core mounting seat; 2231 Second rivet through-hole; 230 Signal processing unit; 240 Rivet; 250 Pin; 300 Locking ring; 310 Channel ring post; 320 Limit block.
[0035] The realization, functional features and advantages of the present utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners
[0036] It should be understood that the specific embodiments described herein are merely used to explain the present utility model and are not used to limit the present utility model.
[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.
[0038] In general, a power frequency transformer is used to isolate between a photovoltaic panel and a power grid in a photovoltaic grid-connected power generation system to achieve electrical isolation and ensure the safety of the system and personnel.
[0039] To improve the system efficiency and reduce the system cost, the power frequency transformer between the photovoltaic panel and the power grid is often omitted, which may cause leakage current in the system and affect the safety of the system. To further improve the safety of the system, a leakage current detection device is generally provided on the photovoltaic inverter to detect the total (including DC and AC parts) effective value current and continuous residual current, and disconnect and issue a fault signal when the current exceeds the limit.
[0040] Existing leakage current detection devices generally include a housing, a leakage current sensing module and a rear cover. The leakage current sensing module is placed between the housing and the rear cover, and whether the position of the leakage current sensing module is fixed to the housing often depends on the rear cover. Therefore, the dependence of the leakage current sensing module on the rear cover easily brings measurement risks to its leakage current detection.
[0041] Therefore, the embodiments of the present utility model provide a leakage current sensor to improve the problem that the existing leakage current sensor depends on the rear cover to fix the leakage current sensing module.
[0042] As Figures 1-5As shown in the figure, the leakage current sensor of the embodiment of the present utility model includes a first housing 100, a leakage current sensing module 200 and a lock ring 300.
[0043] The first housing 100 of the embodiment of the present utility model is in a "return" shape, having a channel and an inner cavity structure surrounding the outside of the channel. The channel is used to accommodate the wire to be measured; the inner cavity is used to accommodate the leakage current sensing module.
[0044] As Figures 3-4 shown in the figure, the first housing 100 of the embodiment of the present utility model includes a channel protrusion 110, pin through holes 120, a bottom plate protrusion 130, a limit post 140 and an insulating block 150.
[0045] The channel protrusion 110 of this embodiment penetrates through the middle of the first side surface of the first housing 100 and protrudes away from the first side surface, and is used to divide the first housing 100 into two parts of space, namely a channel and an inner cavity.
[0046] The pin through holes 120 of this embodiment penetrate through the first bottom surface of the first housing 100 perpendicular to the first side surface; there are multiple pin through holes 120, which are used to accommodate the pins 250 of the leakage current sensing module 200.
[0047] It should be noted that the pin through holes are arranged on the first bottom surface, which can facilitate the pins of the leakage current sensing module to be directly connected to external devices through the pin through holes, without the need to be electrically coupled to external devices through additional wires.
[0048] It should be understood that the pin through holes of this embodiment are located at the middle position of the first bottom surface, which can facilitate the insulation treatment of the part of the pins in the inner cavity, such as applying potting glue, thereby improving the safety of the pins. If the pin through holes are arranged in the gap between the first housing and the rear cover, during the process of applying potting glue, the potting glue will overflow to the outside of the first housing, at least affecting the appearance of the first housing.
[0049] There are multiple bottom plate protrusions 130 in this embodiment, which are arranged on the first bottom surface and are used to fix the positions of the leakage current sensor and external devices.
[0050] It should be noted that the bottom plate protrusions can be provided or not. Its main function is to connect the leakage current sensor and external devices and reduce the load on the pins. If the pins are not directly connected to external devices, this component can be omitted.
[0051] There are multiple limit posts 140 in this embodiment, which are used to support the printed circuit board 210 in the leakage current sensing module 200, so that the leakage current sensing module 200 does not directly contact the first side surface of the first housing 100.
[0052] It should be noted that when the leakage current sensing module 200 is accommodated in the inner cavity of the first housing 100, the side of the printed circuit board 210 facing the first side is placed above each limiting post 140; at the same time, the magnetic core unit in the leakage current sensing module is located within the cavity surrounded by the limiting posts. The number of the limiting posts is two or more, and the specific number is not limited here.
[0053] There are at least two insulating blocks 150 in this embodiment; the two insulating blocks 150 are arranged on the first bottom surface of the first housing 100 and are used to separate the first bottom surface from external devices.
[0054] It should be understood that except for the insulating block 150, the rest of the first housing can be integrally formed.
[0055] The leakage current sensing module 200 of the embodiment of the present utility model includes a printed circuit board 210, a magnetic core unit 220, a signal processing unit 230, rivets 240 and pins 250; the magnetic core unit 220, the signal processing unit 230 and the pins 250 are respectively connected to the printed circuit board 210. The pins 250 are used to connect to external devices. The magnetic core unit 220 is fixedly connected to the printed circuit board 210 through the rivets 240. The signal processing unit 230 and the pins 250 are respectively arranged on the printed circuit board 210. A coil is wound around the magnetic core unit 220; the coil and the signal processing unit 230 are respectively electrically coupled to both ends of the rivet, so that the coil is electrically coupled to the signal processing unit.
[0056] In this embodiment, a plurality of first rivet through-holes 2101 are provided on the printed circuit board 210; a plurality of second rivet through-holes 2231 matching the positions of the first rivet through-holes 2201 are provided on the magnetic core mounting seat 223 of the magnetic core unit 220; the rivets 240 penetrate through the first rivet through-holes 2101 and the second rivet through-holes 2231; the signal processing unit 230 is electrically coupled to the rivets 240 through soldering; the coil is wound around one end of the rivet 240 to achieve electrical coupling with the rivet. The signal processing unit 230 includes a plurality of components, and the plurality of components are respectively integrated on the printed circuit board to realize the electrical coupling of each component. The plurality of components are used to be electrically coupled to the coil and process the output signal of the coil to obtain the leakage current situation of the wire in the channel.
[0057] It should be understood that the number of the first rivet through-holes can be four or more, and no limitation is made here.
[0058] The magnetic core unit 220 of this embodiment includes a magnetic core 221, a magnetic core mounting seat 223 and a magnetic core sleeve 222. The magnetic core sleeve is used to cover the magnetic core to protect the magnetic core; a coil (not shown) is wound around the magnetic core sleeve 222 to sense the magnetic field around the magnetic core; the magnetic core sleeve 222 is embedded in the magnetic core mounting seat 223; there are four second rivet through-holes 2231 on the magnetic core mounting seat.
[0059] It should be noted that the magnetic core sleeve may not be provided separately. When the magnetic core sleeve is not provided separately, the coil is directly wound around the outside of the magnetic core 221, and the magnetic core wound with the coil is nested in the magnetic core mounting seat.
[0060] The magnetic core sleeve has an annular groove for accommodating the magnetic core, and this annular groove is used to accommodate the magnetic core.
[0061] The magnetic core unit of this embodiment further includes a magnetic core cover (not shown), and this magnetic core cover is matched with the magnetic core sleeve to completely surround the annular magnetic core.
[0062] In the magnetic core mounting seat of this embodiment, the number of the second rivet through holes 2231 can be 4 or more, and its number is the same as that of the first rivet through holes 2101.
[0063] To better achieve leakage current detection, the materials of the magnetic core sleeve 222 and the magnetic core mounting seat 223 of this embodiment should be non-magnetic materials, such as plastics.
[0064] The rivet 240 and the pins 250 of this embodiment are both made of conductive materials. Among them, there are 5 pins 250, which are used for electrical coupling with external devices.
[0065] It should be understood that the number of the rivets 240 can be 4 or more, and its number is the same as that of the first rivet through holes; the number of the pins can be 3 or more, and it is not specifically limited here.
[0066] The lock ring 300 of this embodiment includes a channel ring column 310 and a limiting block 320 connected to each other, and the channel ring column is inserted into the channel and fixedly connected to the channel protrusion of the first housing.
[0067] The limiting block 320 of this embodiment is fixedly connected to the channel ring column 310; when the channel ring column 310 is inserted into the channel protrusion 110, one side of the limiting block 320 facing the first side can be in contact with the printed circuit board 210; when the printed circuit board 210 is in contact with the limiting column 140 of the first housing 100, the leakage current sensing module 200 is limited between the limiting block 320 and the limiting column 140.
[0068] It should be understood that when the leakage current sensing module 200 is accommodated in the inner cavity of the first housing 100, if the channel protrusion 110 of the first housing 100 surrounds all of the central inner wall of the leakage current sensing module, it will be difficult to put the leakage current sensing module 200 with the pins 250 into the first housing 100. When the channel protrusion 110 is short enough, the problem of difficult insertion of the leakage current sensing module can be simply realized.
[0069] Therefore, the maximum distance between the channel protrusion 110 of this embodiment and the first side of the first housing is less than the distance between the printed circuit board 210 and the first side.
[0070] The magnetic core unit 220 is located between the printed circuit board 210 and the first side surface of the first housing 100.
[0071] In this embodiment, the channel ring column 310 of the present embodiment is fixedly connected to the channel protrusion 110 through the hollow position of the leakage current sensing module 200. On the one hand, it can extend the length of the channel, and on the other hand, it also achieves the purpose of separating the space between the channel and the inner cavity.
[0072] In this embodiment, the limit block 320 can limit the position of the leakage current sensing module as the channel ring column 310 is fixedly connected to the channel protrusion 110, thereby solving the dependence of the leakage current sensing module on the sensor rear cover.
[0073] Therefore, through the synergistic effect of the first housing and the lock ring in this embodiment, the leakage current sensor fixes the leakage current sensing module in the first housing without relying on the rear cover, reducing the measurement risk caused by the problem of rear cover dependence.
[0074] The leakage current sensing module of this embodiment includes 5 pins, and the first bottom surface includes 5 linearly arranged pin through-holes. Among them, 3 pins are located in the left region of the first bottom surface, and 2 pins are located in the right region of the first bottom surface.
[0075] It should be noted that the leakage current sensing module may include N pins, where N is a positive integer greater than 1; the first bottom surface includes N linearly arranged pin through-holes. At the same time, among the N pins, M pins are located at the first position of the first bottom surface, and N - M pins are located at the second position of the first bottom surface, where M is a positive integer less than N. The specific quantity of N is not limited here.
[0076] The embodiment of the present utility model also provides an electronic device. The electronic device includes the above-mentioned leakage current sensor.
[0077] In one embodiment, the electronic device includes a housing and a leakage current sensor.
[0078] The leakage current sensor is in a "return" shape and has a channel for accommodating the wire to be measured; a plurality of protruding pins and a plurality of bottom surface protrusions are provided at the bottom of the channel; the leakage current sensor is fixedly connected to the installation groove in the housing through the bottom surface protrusions and electrically couples the pins to the pin grooves in the housing. The electronic device can obtain the leakage current situation of the wire to be measured in the channel of the leakage current sensor in real time.
[0079] It should be understood that the above is only for illustration and does not constitute any limitation to the technical solution of the present utility model. In specific applications, those skilled in the art can set according to needs, and the present utility model does not make any restrictions on this.
[0080] It should be noted that the above-described work process is only illustrative and does not limit the protection scope of the present utility model. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the solution of this embodiment, and no limitation is made here.
Claims
1. A leakage current sensor, characterized in that: include: A first housing, comprising a channel protrusion and a pin through hole; the channel protrusion penetrates a first side surface of the first housing and protrudes in a direction away from the first side surface to form a channel for accommodating a wire; the pin through hole penetrates a first bottom surface of the first housing that is perpendicular to the first side surface; A leakage current sensing module, comprising a printed circuit board and a magnetic core unit, a signal processing unit and a plurality of pins respectively connected to the printed circuit board; the leakage current sensing module is accommodated in the inner cavity of the first housing; the pins pass through the first housing through the pin through-holes; A locking ring is connected to the channel protrusion and the printed circuit board respectively, and is used to fix the leakage current sensor module to the first housing.
2. The leakage current sensor according to claim 1, characterized in that: The locking ring comprises a channel ring column and a limit block connected to each other; The channel ring column is clamped with the channel protrusion to separate the channel and the inner cavity, and when the channel ring column is clamped with the channel protrusion, the limit block is abutted against the printed circuit board.
3. The leakage current sensor according to claim 2, characterized in that: The first housing further comprises a plurality of limiting posts; the plurality of limiting posts are perpendicular to the first side surface and are used to form a limiting surface to support the first surface of the printed circuit board; When the channel ring column is engaged with the channel protrusion, the second surface of the printed circuit board opposite to the first surface abuts against the limit block.
4. The leakage current sensor according to claim 3, characterized in that: The magnetic core unit comprises a coil, an annular magnetic core and a magnetic core mounting seat, the annular magnetic core is mounted on the magnetic core mounting seat, and the coil is wound around the annular magnetic core; the magnetic core mounting seat is insulated and connected to the printed circuit board.
5. The leakage current sensor according to claim 4, characterized in that: The magnetic core unit also includes a magnetic core sleeve; the magnetic core sleeve is used to cover the annular magnetic core; the coil is wound around the outer wall of the magnetic core sleeve; and the magnetic core sleeve is arranged on the magnetic core mounting seat.
6. The leakage current sensor according to claim 4, characterized in that: The magnetic core mounting seat includes a plurality of first rivet mounting holes; The printed circuit board comprises a plurality of second rivet mounting holes matching the first rivet mounting holes; The plurality of first rivet mounting holes are respectively connected to the second rivet mounting holes of the printed circuit board through rivets so that the printed circuit board is fixedly connected to the magnetic core unit; The coil is electrically coupled to the signal processing unit via the rivet.
7. The leakage current sensor according to claim 1, characterized in that: The leakage current sensing module includes N pins, where N is a positive integer greater than 1; The first bottom surface includes N pin through holes arranged linearly.
8. The leakage current sensor according to claim 7, characterized in that: M of the pins are located at a first position of the first bottom surface, and NM of the pins are located at a second position of the first bottom surface, wherein M is a positive integer less than N.
9. The leakage current sensor according to claim 1, characterized in that: The maximum distance between the channel protrusion and the first side surface is smaller than the distance from the printed circuit board to the first side surface; The first shell further includes a plurality of insulating blocks, and the insulating blocks are used to separate the first bottom surface from external devices.
10. An electronic device, characterized in that: The electronic device comprises the leakage current sensor according to any one of claims 1 to 9.