PCB board power taking structure of an electric leakage circuit breaker

Abstract

The application discloses a PCB board power taking structure of an electric leakage circuit breaker, and L-pole power taking components include L-pole power taking sheets, soft connections, L-pole conductive sheets and elastic conductive sheets; the L-pole conductive sheet has a first pin, the first pin is inserted into a PCB board and welded with the PCB board; the soft connections are respectively welded with the L-pole power taking sheets and L-pole main line conductors at two ends; a part of the elastic conductive sheet is welded and fixed with the L-pole conductive sheet, the elastic conductive sheet has an extension section, the extension section corresponds to the L-pole power taking sheet to form a mechanical switch; the extension section is driven by an operating mechanism to realize state conversion of the mechanical switch; the N-pole power taking sheet has a second pin, the N-pole power taking sheet is attached to an N-pole main line conductor, the second pin is inserted into the PCB board and welded with the PCB board; the L-pole conductive sheet, the N-pole power taking sheet and the L-pole power taking sheet are all hard conductors; the application has the characteristics of less soft wires.

Description

Technical Field

[0001] This application relates to the electrical field and to a PCB board power supply structure for a residual current circuit breaker. Background Technology

[0002] In miniature residual current circuit breakers (RCCBs), the PCB board typically draws power from the main circuit. The L-pole power-taking terminal is usually electrically connected to the wiring assembly on the moving contact side, thus drawing power from the L-pole main circuit conductor. If the user follows the normal wiring logic (connecting the wiring assembly near the moving contact to the load terminal and the wiring assembly near the stationary contact to the power supply terminal), when the circuit breaker is in the open state, the PCB board is de-energized because the L-pole moving contact and L-pole stationary contact are disconnected. This effectively prevents the PCB board and related components from burning out.

[0003] However, if the user reverses the wiring (connecting the wiring assembly near the moving contact to the power supply and the wiring assembly near the stationary contact to the load), the L-pole power supply terminal will remain energized even when the circuit breaker is open, because it is connected to the wiring assembly on the moving contact side. This continuous energization can damage the PCB board and related components, causing them to burn out.

[0004] With the continuous development of this field, reverse-connection residual current circuit breakers have emerged. Essentially, the L-pole power take-off terminal is made into an openable mechanical switch. The opening and closing of this mechanical switch is accomplished using the internal operating mechanism of the circuit breaker; that is, when the operating mechanism is closed, the mechanical switch is energized; when the operating mechanism is open, the mechanical switch is disconnected. For example, the conductive torsion spring and the first conductive post in CN106373833B have such a structure.

[0005] This structure solves the reverse wiring problem, but it also has another issue: its conductive torsion spring and first conductive post, which are equivalent to the L-pole power take-off terminal, require at least one flexible wire to be soldered to the PCB board; and its undisclosed N-pole power take-off terminal also requires at least one flexible wire to be soldered to the PCB board. This excessive use of flexible wire soldering not only hinders the internal wiring of the residual current circuit breaker but also impedes the automated production and assembly of the circuit breaker. Summary of the Invention

[0006] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and to provide a PCB board power supply structure for a residual current circuit breaker.

[0007] This application provides: a PCB board power supply structure for a residual current circuit breaker, comprising a PCB board, an L-pole main line conductor, an N-pole main line conductor, and an operating mechanism; the operating mechanism includes a closed state and an open state; wherein, it further includes an L-pole power supply component and an N-pole power supply piece, the PCB board draws power from the L-pole main line conductor through the L-pole power supply component, and the PCB board draws power from the N-pole main line conductor through the N-pole power supply piece; The L-pole power supply assembly includes an L-pole power supply piece, a flexible connector, an L-pole conductive piece, and an elastic conductive piece. The L-pole conductive piece has a first pin, which is inserted into and soldered to the PCB board. The two ends of the flexible connector are soldered to the L-pole power supply piece and the L-pole main circuit conductor, respectively. Part of the elastic conductive piece is soldered and fixed to the L-pole conductive piece. The elastic conductive piece has an extension section, which corresponds to the L-pole power supply piece to form a mechanical switch. The extension section is driven by an operating mechanism to realize the state switching of the mechanical switch. When the operating mechanism is in the closed state, the mechanical switch is in the closed state. When the operating mechanism is in the open state, the mechanical switch is in the open state. The N-pole power take-off piece has a second pin. The N-pole power take-off piece is attached to the N-pole main circuit conductor. The second pin is inserted into the PCB board and soldered to the PCB board. The L-terminal conductive sheet, the N-terminal power extraction sheet, and the L-terminal power extraction sheet are all rigid conductors.

[0008] In some embodiments of this application, the operating mechanism includes an N-pole contact support, an L-pole contact support, and a linkage. The N-pole contact support and the L-pole contact support are connected by the linkage and are arranged to rotate synchronously around the same rotation center. A pushing part is provided on the N-pole contact support, which abuts against the extension section so that when the operating mechanism changes to the closed state, the extension section is pushed to contact the L-pole power take-off piece. When the operating mechanism changes to the open state, the extension section separates from the L-pole power take-off piece due to the elasticity of the elastic conductive sheet itself.

[0009] In some embodiments of this application, the L-pole main line conductor includes a first terminal block, the first terminal block having a welding end extending in one direction of a first dimension, and one end of the flexible connection being welded to the welding end.

[0010] In some embodiments of this application, the L-polar conductive sheet further includes a mounting portion, which has a slot. The elastic conductive sheet portion is inserted into the slot and then fixed by welding to the mounting portion.

[0011] In some embodiments of this application, the L-polar conductive sheet further includes a mounting portion, and the elastic conductive sheet includes a bent section, an extension section connected to the bent section, and the bent section welded and fixed to the mounting portion; when the mechanical switch changes from an open state to a closed state, the extension section and the bent section deform with the bent section as the fulcrum.

[0012] In some embodiments of this application, a first connecting portion is also included, and the first pin is connected to the mounting portion through the first connecting portion; the first pin and the mounting portion are offset in a second dimension, and the first pin is closer to the PCB board than the mounting portion in the second dimension.

[0013] In some embodiments of this application, the N-pole main line conductor includes a second terminal block, and the N-pole power taking piece is fixed to the second terminal block by riveting or welding.

[0014] In some embodiments of this application, the second terminal block has a protrusion, and the N-pole tap has a covering portion that contacts at least three different surfaces of the protrusion.

[0015] In some embodiments of this application, the N-pole power-taking sheet further includes a second connecting portion, and the covering portion and the second pin are connected through the second connecting portion; the second pin and the covering portion are offset in the third dimension, and the second pin is closer to the PCB board than the covering portion in the third dimension.

[0016] In some embodiments of this application, the L-polar conductive sheet, the N-polar power-taking sheet, and the L-polar power-taking sheet are distributed in an orientation that forms an imaginary triangle, which is an obtuse or right-angled triangle; in the third dimension, the L-polar conductive sheet is higher than the L-polar power-taking sheet, and the L-polar power-taking sheet is higher than the N-polar power-taking sheet; in the second dimension, the L-polar conductive sheet is located between the N-polar power-taking sheet and the L-polar power-taking sheet.

[0017] The advantages of this application compared to the prior art are: The L-terminal conductive plate and N-terminal power-taking plate are fixed and electrically connected to the PCB board by pin soldering, which greatly reduces the number of flexible wires. The entire structure has only one flexible connection between the L-terminal power-taking plate and the L-terminal main circuit conductor. This structure makes the internal wiring of the circuit breaker simpler and provides a possibility for the automated production and assembly of residual current circuit breakers. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 An internal schematic diagram of a residual current circuit breaker according to an embodiment of this application is shown; Figure 2 A perspective view of the PCB board and its power supply structure according to an embodiment of this application is shown; Figure 3A front view of the PCB board and its power supply structure according to an embodiment of this application is shown; Figure 4 A schematic diagram of the power supply structure in an embodiment of this application with the mechanical switch in the open state is shown; Figure 5 A schematic diagram of the mechanical switch in the closed state in the power supply structure of an embodiment of this application is shown; Figure 6 A schematic diagram of the elastic conductive sheet and the L-polar conductive sheet in the power extraction structure of this application embodiment is shown; Figure 7 A schematic diagram of the L-pole power-taking plate and the first terminal block in the power-taking structure of this application embodiment is shown; Figure 8 A schematic diagram of the N-pole power-taking plate and the second terminal block in the power-taking structure of this application embodiment is shown; Figure 9 A diagram showing the positional relationship between the PCB board, the L-terminal conductive sheet, and the N-terminal power-taking sheet in the power-taking structure of this application embodiment is provided. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "electrical connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed electrical connection, a detachable electrical connection, or an integral connection; they can refer to a mechanical-electrical connection or an electro-electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. Example

[0025] like Figures 1-9 As shown, an embodiment of this application is a residual current circuit breaker.

[0026] The residual current circuit breaker includes a housing, an operating mechanism, an L-pole structure, and an N-pole structure.

[0027] The outer shell has two separate L-pole chambers and N-pole chambers inside.

[0028] The L-pole structure is located within the L-pole cavity and includes the L-pole main circuit conductor.

[0029] The L-pole main circuit conductor includes a first terminal block 100, a first flexible conductor, a solenoid, an L-pole stationary contact, an L-pole moving contact, a second flexible conductor, a bimetallic strip, an arc-starting plate, and a third terminal block. The first terminal block 100, the first flexible conductor, the solenoid, and the L-pole stationary contact are welded sequentially, and the L-pole moving contact, the second flexible conductor, the bimetallic strip, the L-pole arc-starting plate, and the third terminal block are welded sequentially.

[0030] The N-pole structure is located within the N-pole cavity and includes the N-pole main circuit conductor.

[0031] The N-pole main circuit conductor includes a second terminal block 200, an N-pole arc-starting plate, a third flexible conductor, an N-pole moving contact, an N-pole stationary contact, a fourth flexible conductor, and a fourth terminal block. The second terminal block 200, the N-pole arc-starting plate, the third flexible conductor, and the N-pole moving contact are welded in sequence, and the N-pole stationary contact, the fourth flexible conductor, and the fourth terminal block are welded in sequence.

[0032] The L-pole moving contact and N-pole moving contact are jointly driven by the operating mechanism, which includes a handle, connecting rod, trip latch, locking latch, main elastic element, L-pole contact support 300, N-pole contact support 310, and linkage element. The L-pole moving contact is connected to the L-pole contact support 300, and the N-pole moving contact is connected to the N-pole contact support 310. The L-pole contact support 300 and N-pole contact support 310 are arranged to rotate around the same rotation center, and the L-pole contact support 300 and N-pole contact are connected by the linkage element 320 to achieve synchronous rotation. Here, driven by the operating mechanism, the L-pole moving contact can make contact with the N-pole stationary contact, and the L-pole moving contact can make contact with the N-pole stationary contact (i.e., the operating mechanism is in the closed state); it can also make the L-pole moving contact separate from the N-pole stationary contact, and the L-pole moving contact can separate from the N-pole stationary contact (i.e., the operating mechanism is in the open state). The principle behind this operating mechanism is common knowledge in this field and will not be elaborated further here.

[0033] The N-pole structure also includes the PCB board 400 and its power supply structure, the specific structure of which is as follows: The PCB board 400 includes an L-terminal power extraction component 410 and an N-terminal power extraction piece 420.

[0034] The PCB board 400 draws power from the L-terminal main conductor through the L-terminal power-taking component 410.

[0035] L-polar power extraction assembly 410 includes an L-polar power extraction sheet 411, a flexible connection 412, an L-polar conductive sheet 413, and an elastic conductive sheet 414.

[0036] L-polar conductive sheet 413 has a first pin 413a, which is inserted into PCB board 400 and soldered to PCB board 400.

[0037] The two ends of the flexible connector 412 are welded to the L-pole power take-up piece 411 and the L-pole main circuit conductor, respectively.

[0038] A portion of the elastic conductive sheet 414 is welded and fixed to the L-polar conductive sheet 413. The elastic conductive sheet 414 has an extension section 414a, which corresponds to the L-polar power taking sheet 411 to form a mechanical switch S.

[0039] The extension section 414a is driven by the N-pole contact support 310 to realize the state switching of the mechanical switch S. When the operating mechanism is in the closed state, the mechanical switch S is in the closed state, and when the operating mechanism is in the open state, the mechanical switch S is in the open state.

[0040] The N-pole power-taking piece 420 has a second pin 420a. The N-pole power-taking piece 420 is in contact with the N-pole main circuit conductor. The second pin 420a is inserted into the PCB board 400 and soldered to the PCB board 400. The PCB board 400 draws power from the N-pole main circuit conductor through the N-pole power-taking piece 420.

[0041] The L-terminal power extraction piece 411, the L-terminal conductive piece 413, and the N-terminal power extraction piece 420 all use rigid conductors.

[0042] The above structure greatly reduces the number of flexible wires. The entire structure has only one flexible connection 412 between the L-pole current-taking piece 411 and the L-pole main circuit conductor. This structure simplifies the wiring inside the circuit breaker and provides a possibility for the automated production and assembly of residual current circuit breakers.

[0043] Here, the N-pole contact support 310 has a pushing part 310a extending toward the elastic conductive sheet 414. The pushing part 310a abuts against the elastic conductive sheet 414. This structure facilitates the N-pole contact support 310 and the elastic conductive sheet 414 to form a cooperation, so that when the operating mechanism switches to the closed state, the pushing part 310a pushes the extension 414a to contact the L-pole power take-off piece 411; while when the operating mechanism switches to the open state, the second end of the elastic conductive sheet 414 causes the mechanical switch S to open under its own elasticity.

[0044] A portion of the first terminal block 100 is bent to form a welding end 100a, which extends in one direction of the first dimension F1. Here, the first dimension F1 is the width dimension of the circuit breaker (the width dimension has two directions). One end of the flexible connection 412 is welded to the welding end 100a, and the other end is welded to the L-pole current draw piece 411.

[0045] The L-polar conductive sheet 413 also includes a mounting portion 413b. This mounting portion 413b has a slot 413c, within which a portion of the elastic conductive sheet 414 is engaged and fixed. After being engaged and fixed to the slot 413c, it is further secured by welding. This slot 413c design is highly advantageous for the installation of the elastic conductive sheet 414.

[0046] Here, the elastic conductive sheet 414 also includes a bent section 414b, with the extension section 414a connected to the bent section 414b, and the bent section 414b being welded to the mounting part 413b. When the mechanical switch S changes from the open state to the closed state, the extension section 414a and the bent section 414b deform with the bent section 414b as the fulcrum. This design of the bent section 414b is more conducive to the deformation of the elastic conductive sheet 414.

[0047] Here, the first pin 413a and the mounting part 413b are offset in the second dimension F2 and connected by the first connecting part 413d. The second dimension F2 is the length dimension of the circuit breaker. Because of the connection of the first connecting part 413d and the offset arrangement of the first pin 413a and the mounting part 413b, the first pin 413a is closer to the PCB board 400 in the second dimension F2 compared to the mounting part 413b. This structure allows the mounting position of the elastic conductive sheet 414 to be slightly off the PCB board 400, avoiding some components on the PCB board 400 and facilitating the deformation of the elastic conductive sheet 414.

[0048] Here, the N-pole power-taking piece 420 and the second terminal block 200 are fixed together by welding. Besides welding, riveting or a combination of riveting and welding can also be used. This method of fixing ensures that the two parts are in close contact, guaranteeing the stability of the N-pole power supply.

[0049] The second terminal block 200 has a protrusion 200a, and the N-pole power-taking piece 420 has a covering portion 420b. This covering portion 420b has small protrusions in three directions, which are in close contact with the three different surfaces of the protrusion 200a. This structural arrangement can better ensure the contact stability between the two. In addition to the method of contacting three surfaces, it is also possible to contact more surfaces.

[0050] For the N-pole power-taking piece 420, the covering portion 420b and the second pin 420a are connected via the second connecting portion 420c, and the second pin 420a and the covering portion 420b are offset in the third dimension F3. Here, the third dimension F3 refers to the height dimension of the circuit breaker. This arrangement of the third connecting portion and the offset between the second pin 420a and the covering portion 420b makes the second pin 420a closer to the PCB board 400 in the third dimension F3 compared to the covering portion 420b. This structure helps the N-pole power-taking piece 420 avoid some components on the PCB board 400.

[0051] In summary, from the internal perspective of the circuit breaker, the L-pole conductive piece 413, the N-pole current-taking piece 420, and the L-pole current-taking piece 411 are arranged in a triangular configuration, forming an imaginary triangle AN. Here, the imaginary triangle AN is an obtuse triangle. Considering the dimensional direction, in the third dimension F3, the L-pole conductive piece 413 is higher than the L-pole current-taking piece 411, and the L-pole current-taking piece 411 is higher than the N-pole current-taking piece 420. In the second dimension F2, the L-pole conductive piece 413 is positioned between the N-pole current-taking piece 420 and the L-pole current-taking piece 411. Of course, the imaginary triangle AN could also be a right triangle. This distribution makes the internal structure more rationally designed and facilitates the placement of other components in the N-pole structure.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A PCB board power extraction structure for a residual current circuit breaker, comprising a PCB board, an L-pole main line conductor, an N-pole main line conductor, and an operating mechanism; the operating mechanism includes a closed state and an open state; characterized in that: It also includes an L-pole power-taking component and an N-pole power-taking sheet. The PCB board draws power from the L-pole main circuit conductor through the L-pole power-taking component, and the PCB board draws power from the N-pole main circuit conductor through the N-pole power-taking sheet. The L-pole power supply assembly includes an L-pole power supply piece, a flexible connector, an L-pole conductive piece, and an elastic conductive piece. The L-pole conductive piece has a first pin, which is inserted into and soldered to the PCB board. The two ends of the flexible connector are soldered to the L-pole power supply piece and the L-pole main circuit conductor, respectively. Part of the elastic conductive piece is soldered and fixed to the L-pole conductive piece. The elastic conductive piece has an extension section, which corresponds to the L-pole power supply piece to form a mechanical switch. The extension section is driven by an operating mechanism to realize the state switching of the mechanical switch. When the operating mechanism is in the closed state, the mechanical switch is in the closed state. When the operating mechanism is in the open state, the mechanical switch is in the open state. The N-pole power take-off piece has a second pin. The N-pole power take-off piece is attached to the N-pole main circuit conductor. The second pin is inserted into the PCB board and soldered to the PCB board. The L-terminal conductive sheet, the N-terminal power extraction sheet, and the L-terminal power extraction sheet are all rigid conductors.

2. The PCB board power extraction structure of a residual current circuit breaker according to claim 1, characterized in that: The operating mechanism includes an N-pole contact support, an L-pole contact support, and a linkage. The N-pole contact support and the L-pole contact support are connected by the linkage and are arranged to rotate synchronously around the same rotation center. The N-pole contact support is provided with a pushing part, which abuts against the extension section so that when the operating mechanism changes to the closed state, it pushes the extension section to contact the L-pole power take-off piece. When the operating mechanism changes to the open state, the extension section separates from the L-pole power take-off piece due to the elasticity of the elastic conductive sheet.

3. The PCB board power extraction structure of a residual current circuit breaker according to claim 1, characterized in that: The L-pole main line conductor includes a first terminal block, which extends in one direction of the first dimension and has a welding end, with one end of the flexible connection welded to the welding end.

4. The PCB board power extraction structure of a residual current circuit breaker according to claim 1, characterized in that: The L-polar conductive sheet also includes a mounting part with a slot. The elastic conductive sheet is inserted into the slot and then fixed to the mounting part by welding.

5. The PCB board power extraction structure of a residual current circuit breaker according to claim 1, characterized in that: The L-polar conductive sheet also includes a mounting part, and the elastic conductive sheet includes a bending section, an extension section connected to the bending section, and the bending section welded and fixed to the mounting part; when the mechanical switch changes from the open state to the closed state, the extension section and the bending section deform with the bending section as the fulcrum.

6. The PCB board power extraction structure of a residual current circuit breaker according to claim 4 or 5, characterized in that: It also includes a first connecting part, and the first pin is connected to the mounting part through the first connecting part; the first pin and the mounting part are offset in the second dimension, and the first pin is closer to the PCB board than the mounting part in the second dimension.

7. The PCB board power extraction structure of a residual current circuit breaker according to claim 1, characterized in that: The N-pole main circuit conductor includes a second terminal block, and the N-pole power take-up piece is fixed to the second terminal block by riveting or welding.

8. The PCB board power extraction structure of a residual current circuit breaker according to claim 7, characterized in that: The second terminal block has a protrusion, and the N-pole power take-off piece has a cover portion, which contacts at least three different surfaces of the protrusion.

9. The PCB board power extraction structure of a residual current circuit breaker according to claim 8, characterized in that: The N-pole power-taking plate also includes a second connecting part, and the covering part is connected to the second pin through the second connecting part; the second pin and the covering part are offset in the third dimension, and the second pin is closer to the PCB board than the covering part in the third dimension.

10. The PCB board power extraction structure of a residual current circuit breaker according to claim 1, characterized in that: The L-terminal conductive plate, N-terminal power extraction plate, and L-terminal power extraction plate are distributed in an imaginary triangle, which is either obtuse or right-angled. In the third dimension, the L-terminal conductive plate is higher than the L-terminal power extraction plate, and the L-terminal power extraction plate is higher than the N-terminal power extraction plate. In the second dimension, the L-terminal conductive plate is located between the N-terminal power extraction plate and the L-terminal power extraction plate.

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