Circuit board of electric energy meter and electric energy meter

Abstract

The utility model discloses a circuit board of an electric energy meter and the electric energy meter, the circuit board comprises a wire holder, a circuit board body, a relay, a strong current socket and an EMI circuit module, the wire holder is used for connecting an inlet wire and an outlet wire of the electric energy meter; one side of the circuit board body is connected with the wire holder, and the circuit board body comprises a first board surface and a second board surface. The first plate surface comprises a first area opposite to the wire holder, a second area connected with the first area and the wire holder, a third area opposite to the second area, and a fourth area enclosed by the first area, the second area, the wire holder and the third area; the relay comprises a relay body and a relay wiring pin, the relay body is arranged in the first area, and the relay wiring pin extends along the second area and is connected with the wire holder; the strong current socket is arranged on the second plate surface corresponding to the third area; the EMI circuit module is arranged in the fourth area; the product performance and the production process cost of the electric energy meter can be considered.

Description

Technical Field

[0001] This utility model relates to the field of circuit board technology, and in particular to a circuit board and an energy meter. Background Technology

[0002] An electricity meter is an instrument used to measure electricity consumption. As the functions of electricity meters are continuously upgraded, the circuit modules carried on the circuit boards of electricity meters are also increasing, and the power of the power modules used in electricity meters is also gradually increasing. The power modules are gradually being upgraded from linear power supplies to switching power supplies, and they are often also equipped with EMI circuit modules.

[0003] Currently, for energy meters equipped with EMI circuit modules, the circuit board layout faces the challenge of spatial arrangement of components, making it difficult to balance the product performance and manufacturing costs of the energy meter. Utility Model Content

[0004] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a circuit board and a power meter that can balance the product performance and production cost of the power meter.

[0005] In a first aspect, this utility model provides a circuit board for an electricity meter, comprising a terminal block, a circuit board body, a relay, a high-voltage socket, and an EMI circuit module, wherein:

[0006] The terminal block is used to connect the incoming and outgoing lines of the energy meter;

[0007] One side of the circuit board body is connected to the terminal block. The circuit board body includes a first board surface and a second board surface. The first board surface includes a first area opposite to the terminal block, a second area connecting the first area and the terminal block, a third area opposite to the second area, and a fourth area enclosed by the first area, the second area, the terminal block, and the third area.

[0008] The relay includes a relay body and relay wiring pins. The relay body is disposed in the first region, and the relay wiring pins extend along the second region and are connected to the terminal block.

[0009] The high-voltage socket is located on the second panel at a position corresponding to the third area;

[0010] The EMI circuit module is located in the fourth region.

[0011] The circuit board of the energy meter provided according to the embodiments of this utility model has at least the following beneficial effects: by arranging the EMI circuit module in a fourth area enclosed by the first area where the relay body is located, the second area where the relay wiring pins are located, the area where the terminal block is located, and the third area corresponding to the location of the high-voltage socket, the layout of the EMI circuit module on the circuit board can realize the single-sided surface mount technology of the surface mount components, which is beneficial to reduce the production cost. Moreover, the height restriction area formed by the relay body, the relay wiring pins, and the terminal block can not only protect the EMI circuit module, but also realize the same board surface for plug-in and surface mount components, and also realize the isolation between strong and weak currents, so that the EMI circuit module in the switching power supply is spatially isolated from other weak current modules on the circuit board, thus taking into account both the product performance and production cost of the energy meter.

[0012] According to some embodiments of the present invention, the EMI circuit module includes a varistor, a first resistor, a rectifier module, a first capacitor, and a common-mode inductor that are connected in sequence.

[0013] According to some embodiments of the present invention, the circuit board is provided with the varistor located near the third region and the terminal block, and the varistor is electrically connected to the incoming line of the energy meter.

[0014] According to some embodiments of the present invention, the power socket is a carrier communication connection socket, and the power socket is electrically connected to the varistor.

[0015] According to some embodiments of the present invention, the first resistor is a wire-wound resistor and is adjacent to the varistor.

[0016] According to some embodiments of the present invention, the circuit board includes four diodes, and the rectifier module is adjacent to the varistor and the first resistor.

[0017] According to some embodiments of the present invention, the circuit board is provided in which the rectifier module is located near the second region and the terminal block.

[0018] According to some embodiments of the present invention, the circuit board provided has the first capacitor located between the rectifier module and the relay body.

[0019] According to some embodiments of the present invention, the common-mode inductor is located between the first resistor and the relay body, and is adjacent to the first capacitor.

[0020] Secondly, this utility model provides an energy meter, including the circuit board described in the first aspect embodiment above.

[0021] The energy meter provided according to the embodiments of this utility model has at least the following beneficial effects: by arranging the EMI circuit module in a fourth region enclosed by the first region where the relay body is located, the second region where the relay wiring pins are located, the region where the terminal block is located, and the third region corresponding to the location of the high-voltage socket, the layout of the EMI circuit module on the circuit board can realize the single-sided surface mount technology of the surface mount components, which is beneficial to reduce the production cost. Moreover, the height restriction area formed by the relay body, the relay wiring pins, and the terminal block can not only protect the EMI circuit module, but also realize the same board surface for plug-in and surface mount components, and also realize the isolation between strong and weak currents, so that the EMI circuit module in the switching power supply is spatially isolated from other weak current modules on the circuit board, thus taking into account both the product performance and production cost of the energy meter.

[0022] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0023] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0025] Figure 1 This is a circuit schematic diagram of the EMI circuit module provided in this embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram showing the layout of the terminal block and the first surface of the circuit board body in the circuit board of the energy meter provided in this embodiment of the utility model.

[0027] Figure 3 This is a schematic diagram showing the area division and layout of the first surface of the circuit board body in the circuit board of the energy meter provided in this embodiment of the utility model.

[0028] Figure 4 This is a schematic diagram showing the layout of the terminal block and the second surface of the circuit board body in the circuit board of the energy meter provided in this embodiment of the utility model. Detailed Implementation

[0029] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0030] In the description of the embodiments of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number, while "above," "below," "within," etc. are understood to include the stated number. "At least one" refers to one or more, and "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or multiple items. If "first," "second," etc., are used in the description, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0031] It should be noted that the terms "setting," "installing," and "connecting" in the embodiments of this utility model should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the above terms in the embodiments of this utility model in conjunction with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or a connection that allows for mutual communication; it can be a direct connection or an indirect connection through an intermediate medium.

[0032] It should be noted that the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] An electricity meter is an instrument used to measure electricity consumption. Each electricity meter has its own power module to maintain normal operation. As electricity meters become increasingly intelligent, their functions are constantly expanding, and the power required to maintain normal operation is gradually increasing. The original linear power supply can no longer meet their needs, and the power supply is gradually being upgraded from linear power supplies to switching power supplies. With the continuous increase in electricity meter functions, their structure and electronic design are becoming more complex, and the constraints on PCB layout are also increasing. Given the increasing product functionality and design complexity, achieving a reasonable PCB layout within a limited space while meeting product performance requirements is a challenge in the product design process. This requires effectively utilizing space through reasonable structure and component spatial layout to ensure the final performance of the product. Specifically, the EMI circuit module used in the switching power supply for EMI absorption is basically composed of high-end plug-in components, which have even higher space requirements. Therefore, it is necessary to adjust the position of the internal components of the electricity meter structurally to achieve a reasonable spatial layout, thereby achieving a reasonable component layout on the entire PCB and realizing single-sided surface mounting.

[0034] Based on this, the present invention provides a circuit board and an energy meter that can balance the product performance and manufacturing cost of the energy meter. It solves the problem of difficult circuit component layout of the EMI circuit module of the switching power supply when the energy meter is using a switching power supply due to many limitations such as internal space height limit and strong and weak current isolation. By reasonably setting the layout of the EMI circuit module of the switching power supply, the single-sided surface mount technology of PCB components can be realized, thereby reducing the manufacturing cost.

[0035] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0036] Reference Figures 1 to 4 The first aspect of this utility model provides a circuit board for an electricity meter, including a terminal block 100, a circuit board body 200, a relay 300, a high-voltage socket 400, and an EMI circuit module 500.

[0037] Specifically, the terminal block 100 is used for connecting the incoming and outgoing lines of the power meter; for example, refer to... Figure 4 As shown, the terminal block 100 is provided with multiple terminals, which are respectively connected to the live wire inlet, neutral wire inlet, live wire outlet, and neutral wire outlet of the power meter.

[0038] One side of the circuit board body 200 is connected to the terminal block 100. The circuit board body 200 includes a first board surface 210 and a second board surface 220, as shown in the figure. Figure 3As shown, the first plate surface 210 includes a first region 211 opposite to the terminal block 100, a second region 212 connecting the first region 211 and the terminal block 100, a third region 213 opposite to the second region 212, and a fourth region 214 enclosed by the first region 211, the second region 212, the terminal block 100, and the third region 213.

[0039] Reference Figure 2 and Figure 3 The relay 300 includes a relay body 310 and a relay pin 320. The relay body 310 is disposed in the first region 211, and the relay pin 320 extends along the second region 212 and is connected to the terminal block 100. Specifically, the relay pin 320 may include two metal conductor pieces inside, one of which is electrically connected to the live wire inlet in the terminal block 100, and the other is connected to the live wire outlet in the terminal block 100. An actuating spring is disposed inside the relay body 310. When the coil of the relay body 310 is energized, the spring actuates to make the two metal conductor pieces conduct or disconnect.

[0040] Reference Figure 4 The high-voltage socket 400 is located on the second panel 220 at the position corresponding to the third area 213. It can be understood that after the high-voltage socket 400 is located on the second panel 220 at the position corresponding to the third area 213, the third area 213 of the first panel 210 becomes the area on the opposite side of the high-voltage socket 400 where devices are prohibited from being placed.

[0041] The EMI circuit module 500 is located in area 4, 214. The circuit schematic of the EMI circuit module 500 can be found in [reference needed]. Figure 1 As shown.

[0042] According to the circuit board of the energy meter provided in this embodiment of the utility model, by arranging the EMI circuit module 500 in a fourth region 214 surrounded by the first region 211 where the relay body 310 is located, the second region 212 where the relay wiring pins 320 are located, the region where the terminal block 100 is located, and the third region 213 corresponding to the location of the high-voltage socket 400, the layout of the EMI circuit module 500 on the circuit board can realize the single-sided surface mount technology of the surface mount components, which is beneficial to reduce the production cost. Moreover, the height limit area formed by the relay body 310, the relay wiring pins 320 and the terminal block 100 can not only protect the EMI circuit module 500, but also realize the same board surface for plug-in and surface mount components, and also realize the isolation between strong and weak currents. This spatially isolates the EMI circuit module 500 in the switching power supply from other weak current modules on the circuit board, taking into account both the product performance and production cost of the energy meter.

[0043] Reference Figure 1 In some embodiments of the circuit board provided by this utility model, the EMI circuit module 500 includes a varistor ZR, a first resistor R1, a rectifier module 510, a first capacitor C1, and a common-mode inductor LM connected in sequence. Specifically, the live wire AC-L of the energy meter is connected to one end of the varistor ZR and one end of the first resistor R1, and the neutral wire AC-N of the energy meter is connected to the other end of the varistor ZR; the rectifier module 510 includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, the other end of the first resistor R1 is connected to the anode of the first diode D1 and the cathode of the second diode D2, the other end of the varistor ZR is also connected to the anode of the third diode D3 and the cathode of the fourth diode D4, the cathodes of the first diode D1 and the third diode D3 are connected to one end of the first capacitor C1, the anodes of the second diode D2 and the fourth diode D4 are connected to the other end of the first capacitor C1, and the two ends of the first capacitor C1 are respectively connected to one end of the two inductor coils of the common-mode inductor LM.

[0044] In this embodiment, the EMI circuit module 500 is used to effectively absorb or filter electromagnetic interference introduced from the live wire AC-L and neutral wire AC-N of the electricity meter, which is beneficial to improving the performance of the electricity meter.

[0045] Reference Figure 2 and Figure 3 In some embodiments of the present invention, the varistor ZR is located near the third region 213 and the terminal block 100, and the varistor ZR is electrically connected to the incoming line of the energy meter.

[0046] In this embodiment, since the varistor ZR needs to be electrically connected to the live wire AC-L and neutral wire AC-N of the energy meter, the varistor ZR is positioned near the terminal block 100 to facilitate electrical connection with the energy meter's incoming wires.

[0047] Reference Figure 1 and Figure 4 In some embodiments of the present invention, the power socket 400 is a carrier communication connection socket, and the power socket 400 is electrically connected to the varistor ZR.

[0048] In this embodiment, the high-voltage socket 400 serves as a carrier communication connection socket. The carrier communication module can send carrier communication signals to the live wire AC-L and neutral wire AC-N of the energy meter through the high-voltage socket 400, or obtain carrier communication signals from the live wire AC-L and neutral wire AC-N of the energy meter through the high-voltage socket 400, thereby realizing communication with other energy meters. The varistor ZR is located near the third region 213 and the terminal block 100, which facilitates the electrical connection between the high-voltage socket 400 and the varistor ZR.

[0049] Reference Figure 2 and Figure 3 In some embodiments of the present invention, the circuit board provided has a first resistor R1 that is a wire-wound resistor and is adjacent to a varistor ZR.

[0050] In this embodiment, since the resistance value of the first resistor R1 in the EMI circuit module 500 needs to be set to a large value, using a wire-wound resistor for the first resistor R1 can help reduce the board area occupied by the first resistor R1; in addition, since the first resistor R1 needs to be electrically connected to the varistor ZR, the first resistor R1 is adjacent to the varistor ZR, which facilitates the electrical connection between the first resistor R1 and the varistor ZR.

[0051] Reference Figure 1 In some embodiments of the circuit board provided by this utility model, the rectifier module 510 includes four diodes, namely a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, as shown in the figure. Figure 2 and Figure 3 The rectifier module 510 is adjacent to the varistor ZR and the first resistor R1.

[0052] In this embodiment, since the rectifier module 510 needs to be electrically connected to the varistor ZR and the first resistor R1 respectively, the rectifier module 510 is adjacent to the varistor ZR and the first resistor R1, which facilitates the electrical connection between the rectifier module 510 and the varistor ZR and the first resistor R1.

[0053] Reference Figure 2 and Figure 3 In some embodiments of the present invention, the rectifier module 510 is located near the second region 212 and the terminal block 100.

[0054] In this embodiment, since the metal conductor piece in the relay wiring pin 320 located in the second region 212 needs to be connected across the terminal block 100, and the height of the diode in the rectifier module 510 is lower than that of the first capacitor C1, common mode inductor LM and other devices, the rectifier module 510 is located close to the second region 212 and the terminal block 100, and the space above the diode can be used for the metal conductor piece in the relay wiring pin 320 to be connected across.

[0055] Reference Figure 2 and Figure 3 In some embodiments of the present invention, the first capacitor C1 is located between the rectifier module 510 and the relay body 310.

[0056] In this embodiment, the first capacitor C1 needs to be electrically connected to the rectifier module 510. Therefore, the first capacitor C1 is located near the rectifier module 510, which facilitates the electrical connection between the first capacitor C1 and the rectifier module 510.

[0057] Reference Figure 2 and Figure 3 In some embodiments of the present invention, the common mode inductor LM is located between the first resistor R1 and the relay body 310, and is adjacent to the first capacitor C1.

[0058] In this embodiment, the common-mode inductor LM needs to be electrically connected to the first capacitor C1. Therefore, the common-mode inductor LM is adjacent to the first capacitor C1, which facilitates the electrical connection between the common-mode inductor LM and the first capacitor C1.

[0059] It is understood that the arrangement of devices such as the varistor ZR, the first resistor R1, the rectifier module 510, the first capacitor C1, and the common mode inductor LM in the fourth region 214 of this utility model embodiment not only arranges the devices that need to be electrically connected adjacently, but also reasonably allocates the area of ​​the fourth region 214, ensuring that the entire energy meter can realize the PCB single-sided surface mount production process, which is conducive to improving production efficiency and reducing production process costs.

[0060] In addition, a second aspect of the present invention provides an energy meter, including the circuit board of the first aspect embodiment described above.

[0061] According to the energy meter provided in this embodiment of the present invention, by arranging the EMI circuit module 500 in a fourth region 214 enclosed by the first region 211 where the relay body 310 is located, the second region 212 where the relay wiring pins 320 are located, the region where the terminal block 100 is located, and the third region 213 corresponding to the location of the high-voltage socket 400, the layout of the EMI circuit module 500 on the circuit board can realize the single-sided surface mount technology of the surface mount components, which is beneficial to reduce the production cost. Moreover, the height restriction area formed by the relay body 310, the relay wiring pins 320 and the terminal block 100 can not only protect the EMI circuit module 500, but also realize the same board surface for plug-in and surface mount components, and also realize the isolation between strong and weak currents. This spatially isolates the EMI circuit module 500 in the switching power supply from other weak current modules on the circuit board, taking into account both the product performance and production cost of the energy meter.

[0062] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A circuit board of an electric energy meter, characterized by, The utility model relates to an electric energy meter circuit board, comprising: a terminal block for connecting incoming and outgoing lines of the electric energy meter; a circuit board body, one side of which is connected with the terminal block, the circuit board body comprising a first board surface and a second board surface, the first board surface comprising a first area opposite to the terminal block, a second area connecting the first area and the terminal block, a third area opposite to the second area, and a fourth area enclosed by the first area, the second area, the terminal block and the third area; a relay comprising a relay body and relay terminal pins, the relay body being arranged in the first area, the relay terminal pins extending along the second area and being connected with the terminal block; a strong current socket arranged on the second board surface at a position corresponding to the third area; an EMI circuit module arranged in the fourth area.

2. The circuit board of claim 1, wherein The EMI circuit module comprises, in sequence, a voltage-dependent resistor, a first resistor, a rectifier module, a first capacitor and a common-mode inductor.

3. The circuit board of claim 2, wherein, The voltage-dependent resistor is arranged close to the third area and the terminal block, and is electrically connected with the incoming line of the electric energy meter.

4. The circuit board of claim 3, wherein The strong current socket is a carrier wave communication connection socket, and is electrically connected with the voltage-dependent resistor.

5. The circuit board of claim 3, wherein The first resistor is a wire-wound resistor and is adjacent to the voltage-dependent resistor.

6. The circuit board of claim 5, wherein, The rectifier module comprises four diodes, and is adjacent to the voltage-dependent resistor and the first resistor.

7. The circuit board of claim 6, wherein The rectifier module is arranged close to the second area and the terminal block.

8. The circuit board of claim 6, wherein, The first capacitor is located between the rectifier module and the relay body.

9. The circuit board of claim 8, wherein, The common-mode inductor is located between the first resistor and the relay body, and is adjacent to the first capacitor.

10. An electric energy meter, characterized by The utility model relates to an electric energy meter circuit board, comprising the circuit board of any one of claims 1 to 9.

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