High-voltage sampling capacitor bank, mortise and tenon connection circuit board and circuit breaker

Abstract

According to the circuit board and the circuit breaker in mortise and tenon connection, the ceramic capacitors are combined in series and in parallel, the ceramic capacitors with corresponding capacitance values are selected for voltage division according to the final capacitance value to be reached, and the voltage withstand level of the whole capacitor is remarkably improved, so that the national standard thunder and lightning pulse test requirements are met; the plurality of ceramic capacitors in each group of units are connected in parallel, so that voltage stress can be dispersed, the pressure burden of a single capacitor is reduced, the one-to-one corresponding connection between the adjacent units ensures uniform voltage distribution, and some capacitors are prevented from bearing overhigh voltage. Furthermore, by adopting an assembly mode of a tenon-and-mortise structure, the space interference with other functional parts on the pole is avoided, and the matching with the installation space of the existing pole is realized.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment manufacturing technology, and in particular to a circuit board and circuit breaker with mortise and tenon joints. Background Technology

[0002] Currently, high-voltage sampling capacitors on the market generally use a series connection of ceramic capacitors to achieve high withstand voltage. Specifically, ceramic capacitors with corresponding capacitance values ​​are selected for voltage division based on the desired final capacitance value. However, due to the large package size of existing surface-mount ceramic capacitors and the limitations imposed by the terminal specifications, a single PCB design often cannot meet the requirements. Furthermore, traditional PCB layouts result in a bulky overall structure. In addition, the series connection of a large number of ceramic capacitors inevitably leads to heat dissipation problems, easily causing localized overheating. Moreover, in existing technologies, the connection between PCBs relies heavily on wires, which not only increases assembly difficulty but also easily reduces reliability due to an excessive number of connection points. Utility Model Content

[0003] This invention provides a circuit board and circuit breaker with mortise and tenon joints, which improves the overall voltage withstand rating of the capacitor.

[0004] This utility model provides a high-voltage sampling capacitor bank, comprising: multiple sets of ceramic capacitor units connected in series, each set of ceramic capacitor units containing multiple ceramic capacitors connected in parallel, and the ceramic capacitors in two adjacent ceramic capacitor units being connected in a one-to-one correspondence.

[0005] Furthermore, the ceramic capacitor has a first electrode and a second electrode; within any group of ceramic capacitor units, the first electrodes of the ceramic capacitors are connected in parallel to form a first common electrode; the second electrodes of the ceramic capacitors are connected in parallel to form a second common electrode; the second common electrode of the ceramic capacitor in the preceding ceramic capacitor unit is connected to the first common electrode of the ceramic capacitor in the following ceramic capacitor unit.

[0006] Furthermore, multiple ceramic capacitor units are connected in series along the first direction to form a ceramic capacitor group, and multiple ceramic capacitor groups are arranged at intervals along the second direction; the ceramic capacitor units in two adjacent ceramic capacitor groups along the second direction are connected in series end to end; wherein, the first direction and the second direction are two mutually perpendicular directions in the same plane.

[0007] Furthermore, the plurality of ceramic capacitors are arranged equidistantly and in parallel along the second direction.

[0008] This utility model also provides a mortise and tenon connected circuit board, wherein a high-voltage sampling capacitor bank with the above-described structure is disposed within the mortise and tenon connected circuit board, and the circuit board includes:

[0009] N main PCB boards and connector boards;

[0010] The main PCB board has multiple ceramic capacitor mounting positions.

[0011] The two adjacent main PCB boards are connected by tenon and mortise joints; the first main PCB board and the Nth main PCB board are respectively connected to the connecting plate by tenon and mortise joints.

[0012] Furthermore, the surface of the PCB board is treated with electroless gold plating.

[0013] Furthermore, the ceramic capacitors on the two adjacent main PCBs are respectively mounted on two opposite sides of the main PCBs.

[0014] Furthermore, the connecting plate is provided with a plurality of through holes arranged in parallel at equal intervals.

[0015] This utility model also provides a circuit breaker in which the above-mentioned high-voltage sampling capacitor bank is installed.

[0016] Compared with the prior art, the present invention has at least the following technical effects:

[0017] In this invention, ceramic capacitors are combined in series and parallel. Ceramic capacitors with corresponding capacitance values ​​are selected for voltage division according to the final capacitance value to be achieved, which significantly improves the overall voltage withstand level of the capacitors, thereby meeting the national standard requirements for lightning pulse testing. In addition, the parallel connection of multiple ceramic capacitors in each unit can disperse voltage stress and reduce the pressure burden on individual capacitors. The one-to-one correspondence between adjacent units ensures uniform voltage distribution and avoids some capacitors from bearing excessively high voltage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the high-voltage sampling capacitor bank in Embodiment 1 of this utility model;

[0019] Figure 2 This is a schematic diagram of the ceramic capacitor unit in the high-voltage sampling capacitor bank in Embodiment 1 of this utility model;

[0020] Figure 3 This is a schematic diagram of the circuit board structure in Embodiment 2 of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the circuit board and connecting plate after assembly in Embodiment 2 of this utility model. Detailed Implementation

[0022] The following description, in conjunction with schematic diagrams, illustrates a preferred embodiment of the present invention involving a mortise and tenon joint connecting a circuit board and a circuit breaker. It should be understood that those skilled in the art can modify the present invention described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the scope of the present invention.

[0023] The present invention will be described more specifically by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0024] Example 1

[0025] Please refer to Figure 1 The present invention discloses a high-voltage sampling capacitor bank, comprising: multiple sets of ceramic capacitor units 1 connected in series, each set of ceramic capacitor units 1 containing multiple ceramic capacitors connected in parallel, and the ceramic capacitors in two adjacent sets of ceramic capacitor units 1 being connected in a one-to-one correspondence.

[0026] In this embodiment, ceramic capacitors are combined in series and parallel. Ceramic capacitors with corresponding capacitance values ​​are selected for voltage division according to the final capacitance value to be achieved, which significantly improves the overall voltage withstand level of the capacitors, thereby meeting the national standard requirements for lightning pulse testing. In addition, the parallel connection of multiple ceramic capacitors in each unit can disperse voltage stress and reduce the pressure burden on individual capacitors. The one-to-one correspondence between adjacent units ensures uniform voltage distribution and avoids some capacitors from being subjected to excessively high voltage.

[0027] In one specific embodiment, please refer to Figure 1 and Figure 2 The specific connection method of the ceramic capacitors in two adjacent ceramic capacitor units 1 is as follows: the ceramic capacitor has a first electrode and a second electrode; in any group of ceramic capacitor units 1, the first electrodes of the ceramic capacitors are connected in parallel to form a first common electrode; the second electrodes of the ceramic capacitors are connected in parallel to form a second common electrode; the second common electrode of the ceramic capacitor in the previous ceramic capacitor unit 1 is connected to the first common electrode of the ceramic capacitor in the next ceramic capacitor unit 1.

[0028] Furthermore, in this embodiment, multiple ceramic capacitor units 1 are connected in series along a first direction to form a ceramic capacitor group 2, and multiple ceramic capacitor groups 2 are arranged at intervals along a second direction; the ceramic capacitor units 1 in two adjacent ceramic capacitor groups 2 along the second direction are connected in series end to end; wherein, the first direction and the second direction are two directions perpendicular to each other.

[0029] Furthermore, in this embodiment, the plurality of ceramic capacitors are arranged in parallel at equal intervals along the second direction.

[0030] In one specific embodiment, the number of ceramic capacitors in each ceramic capacitor unit 1 is equal, and the specifications of each ceramic capacitor are the same.

[0031] In another specific embodiment, each ceramic capacitor unit 1 includes 12 ceramic capacitors arranged in parallel at equal intervals. The ceramic capacitor group 2 includes ceramic capacitor units 1, with 4 ceramic capacitor units 1 arranged in parallel at equal intervals in the second direction. This forms a "12 parallel 28 series" high-voltage sampling capacitor group structure.

[0032] In another specific embodiment, a ceramic capacitor with an 820pF capacitance, a 5kV withstand voltage, an NP0 temperature coefficient, and a 2225 package is selected. Using a "12 in parallel, 28 in series" configuration, the total capacitance of the final high-voltage sampling capacitor bank is calculated as: 820pF × 12 ÷ 28 = 351pF. 351pF is the final capacitance of the sampling capacitor. The withstand voltage of the 28 series capacitors is "5kV × 28 = 140kV," which is the DC withstand voltage rating of the sampling capacitor. Those skilled in the art will understand that the specifications and number of the above-mentioned ceramic capacitors can be determined according to actual circumstances and are not specifically limited here.

[0033] In this embodiment, by selecting a ceramic capacitor with a higher withstand voltage, the overall capacitor withstand voltage level is further reduced and improved.

[0034] Example 2

[0035] Based on the same inventive concept, this application provides a circuit board on which the high-voltage sampling capacitor bank disclosed in Embodiment 1 is disposed. The circuit board provided in this application also possesses the advantages of the high-voltage sampling capacitor bank of any of the above embodiments, and will not be repeated here.

[0036] Please refer to Figure 3 This embodiment discloses a high-voltage sampling capacitor PCB structure, including: N main PCB boards 30 and connecting boards 10; the main PCB board 30 is provided with a plurality of ceramic capacitor mounting positions 301; adjacent main PCB boards 30 are connected by tenon and mortise joints; the first main PCB board 30 and the Nth main PCB board 30 are respectively connected to the connecting board 10 by tenon and mortise joints.

[0037] Furthermore, in this embodiment, the capacitors are arranged in a stacked manner, that is, the ceramic capacitors on two adjacent main PCB boards 30 are respectively installed on two opposite sides of the main PCB board 30.

[0038] In one specific embodiment, the main PCB board 30 has a plurality of first grooves 302 and first protrusions 303 arranged sequentially at intervals on both sides. The mortise and tenon connection between the two main PCB boards 30 is achieved through the mutual interlocking connection between the first grooves 302 and the first protrusions 303.

[0039] In another specific embodiment, at least one side of the connecting plate 10 is provided with a plurality of second protrusions 102 and second grooves 103, which can be mutually engaged with the plurality of first protrusions 303 and first grooves 302 provided on one side of the first main PCB board 30 and the Nth main PCB board 30, realizing the tenon-and-mortise connection between the main PCB board 30 and the connecting plate 10. After the connection is completed, the final assembly forms as shown in the figure. Figure 4 The structure shown.

[0040] In another specific embodiment, the protrusion is welded into the groove to achieve a robust mortise and tenon connection.

[0041] In this embodiment, a mortise and tenon structure assembly method is adopted to avoid spatial interference with other functional components on the pole (such as insulators, connecting hardware, etc.) and to achieve matching with the existing pole installation space.

[0042] In this embodiment, the main PCB board 30 includes multiple equidistant and parallel ceramic capacitor mounting positions 301, with vias between them for signal connections between different layers of the PCB. The connecting board 10 has multiple equidistant and parallel through holes 100. The number of through holes 100 is generally set to be the same as the number of ceramic capacitor mounting positions 301 in the main PCB board 30. Specifically, the through holes 100 are provided to achieve heat dissipation of the main PCB board 30.

[0043] It is understood that the number of main PCB boards 30 is not specifically limited here, for example, 3, 4, and 5. The number of ceramic capacitor mounting positions 301 set in the main PCB board 30 is also not specifically limited here, for example, 15, 18, and 20, etc.

[0044] Furthermore, in one specific embodiment, the PCB is manufactured using a 2.0mm thick board material, a 1-ounce thick copper foil on the surface, and surface pads are treated with a chemical gold process. The 0.8mm vias are treated with a copper paste plugging process, thereby improving the board's conductivity and current carrying capacity.

[0045] Example 3

[0046] Based on the same inventive concept, this embodiment discloses a circuit breaker, including the high-voltage sampling capacitor bank as described in Embodiment 1. The high-voltage sampling capacitor is a component of the primary and secondary deeply integrated pole-mounted switch circuit breaker, mainly used to connect the 10kV AC power of the pole-mounted switch for sampling and sending to the signal box. The advantages of the high-voltage sampling capacitor bank in any of the above embodiments are also present in the circuit breaker provided in this application embodiment, and will not be repeated here.

[0047] Various modifications and variations are permitted without departing from the spirit and scope of this utility model. Thus, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A circuit board with a tenon-and-mortise joint connection, characterized in that, The circuit board includes: Multiple sets of ceramic capacitor units connected in series, each set of ceramic capacitor units contains multiple ceramic capacitors connected in parallel, and the ceramic capacitors in two adjacent ceramic capacitor units are connected in a one-to-one correspondence. N main PCB boards and connector boards; The main PCB board has multiple mounting positions for the ceramic capacitors. The two adjacent main PCB boards are connected by tenon and mortise joints; the first main PCB board and the Nth main PCB board are respectively connected to the connecting plate by tenon and mortise joints.

2. The circuit board with mortise and tenon joint as described in claim 1, characterized in that, The ceramic capacitor has a first electrode and a second electrode; Within any group of ceramic capacitor units, the first electrodes of the ceramic capacitors are connected in parallel to form a first common electrode. The second electrodes of the ceramic capacitor are connected in parallel to form a second common electrode; The second common electrode of the ceramic capacitor in the previous ceramic capacitor unit is connected to the first common electrode of the ceramic capacitor in the next ceramic capacitor unit.

3. The circuit board with mortise and tenon joint as described in claim 2, characterized in that, Multiple ceramic capacitor units are connected in series along a first direction to form a ceramic capacitor group, and multiple ceramic capacitor groups are arranged at intervals along a second direction; ceramic capacitor units in two adjacent ceramic capacitor groups along the second direction are connected in series end to end; wherein, the first direction and the second direction are two mutually perpendicular directions in the same plane.

4. The circuit board with mortise and tenon joint as described in claim 3, characterized in that, The ceramic capacitors are arranged equidistantly and in parallel along the second direction.

5. The circuit board with mortise and tenon joint as described in claim 4, characterized in that, The PCB board surface is treated with electroless gold plating.

6. The circuit board with mortise and tenon joint as described in claim 5, characterized in that, The ceramic capacitors on the two adjacent main PCBs are respectively mounted on two opposite sides of the main PCBs.

7. The circuit board with a tenon-and-mortise connection as described in claim 5 or 6, characterized in that, The connecting plate has multiple through holes arranged in parallel at equal intervals.

8. A circuit breaker, characterized in that, Includes the high-voltage sampling capacitor bank as described in any one of claims 1-7.

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