CN212905079U - Miniature wireless metering module - Google Patents

Abstract

The utility model provides a miniature wireless metering module includes base, lid and circuit board, belongs to the measurement device field, and the integration has power supply circuit, control circuit, current-voltage sampling circuit, wireless communication circuit and measurement circuit on the circuit board, is equipped with exerted electric plug at the base or covers. The current and voltage sampling circuit comprises a current transformer, the base, the cover and the circuit board are provided with openings corresponding to the positions, one end of the inner side of the opening of the base/cover extends to the opposite side of the cover/base covered with the opening of the base/cover, and the extension part penetrates through the opening of the circuit board and the opening of the cover/base to be sealed and closed. The utility model provides a miniature wireless measurement wireless module small in size, wiring are convenient, are convenient for cooperate the use with single branch road or single consumer with the grafting mode to satisfy the measurement demand of single branch road or single device.

Description

Miniature wireless metering module

Technical Field

The utility model relates to a metering equipment field especially relates to a be applied to miniature wireless metering module of electric energy measurement.

Background

At present, electric energy meters are generally arranged in meter boxes at fixed positions, and electric units of the electric energy meters generally comprise more electric equipment and branch circuits. When single equipment or a single branch needs to measure electric energy independently, the common electric energy meter cannot be completely covered and used. The traditional electric energy meter is large in size, complex in wiring and high in cost, so that the practicability is lacked in practical application.

Based on this, the present application is proposed.

Disclosure of Invention

The utility model provides a not enough to prior art, the utility model provides a miniature wireless intelligent metering module, single-phase electric energy meter is difficult to cover single branch road or single equipment among the solution prior art and carries out the problem that the electric energy was measured, is suitable for in-service use to its small in size, the wiring of being convenient for.

In order to achieve the purpose, the utility model discloses miniature wireless metering module includes base, lid and circuit board; the circuit board is integrated with a power supply circuit, a control circuit, a current and voltage sampling circuit, a wireless communication circuit and a metering circuit, an exposed electric plug is arranged on the base or the cover, and the electric plug is electrically connected with the input end of the power supply circuit. The current and voltage sampling circuit comprises a current transformer, the base, the cover and the circuit board are provided with corresponding openings, the openings of the base, the cover and the circuit board are provided with common hole walls or are connected and matched with the outside to be separated, and the current transformer is sleeved on the hole walls.

The power supply circuit supplies power for other circuits, the output end of the current and voltage sampling circuit is electrically connected with the input end of the metering circuit, the metering circuit is in serial communication connection with the control circuit, and the wireless circuit is in serial communication connection with the control circuit.

Through the structure, the utility model provides a can with single equipment or single branch road on set up with the cooperation of grafting mode, to single equipment or single branch road carry out the wireless metering module of electric energy measurement. It is with the built-in setting of current transformer to the mutual inductance mode of current is taken a sample, makes things convenient for the sample wiring, sets up the electric plug simultaneously in order to realize getting the electricity through the grafting mode. In conclusion, when the sampling device is used, wires to be sampled only need to pass through the openings in the cover, the base and the circuit board, and then the whole module is inserted into the socket through the electric plug or controls the circuit breakers of the single device and the single branch circuit to complete wiring. When the device is used, the device information and the electric energy condition of a single device or a single branch can be obtained through wireless communication between the mobile terminal or the local computer, the cloud server and the control circuit, and the coverage rate of a metering point is improved.

For further optimization the utility model discloses an overall structure, the utility model discloses further set up as follows: the electrical plug is positioned adjacent to the opening in the base/cover on which it is positioned.

The utility model discloses further set up as follows: the circuit board comprises an upper circuit board and a lower circuit board which are arranged oppositely up and down; the circuit is arranged on the upper circuit board and the lower circuit board respectively and is electrically connected through electric plug connectors distributed on the upper circuit board and the lower circuit board relatively.

The circuit board is divided into two parts by the structure, so that the size of the original circuit board in the length direction of the original circuit board is greatly reduced, the upper circuit board and the lower circuit board are close to each other by combining an upper and lower relative distribution mode, the size in the upper and lower directions and the occupied space are reduced, the volume of the whole module is contracted into a cuboid or a cuboid approximate to the cuboid, and the volume of the wireless metering module is miniaturized and miniaturized so as to be suitable for practical use.

Moreover, when the upper circuit board and the lower circuit board are distributed up and down, the front surfaces (namely the side surface on one side mainly used for mounting electronic products) of the upper circuit board and the lower circuit board can be arranged oppositely, the electronic devices are accommodated by utilizing the interval between the upper circuit board and the lower circuit board, and the back surfaces of the upper circuit board and the lower circuit board are in clearance fit with the base or the cover, so that the size of the whole module in the up-and-down direction is further reduced, and the volume of.

In addition, the up-and-down distribution mode is also suitable for adopting the plug-in mode to connect the circuit on the upper circuit board and the circuit on the lower circuit board into a whole, and the structure is simple and convenient to assemble.

In order to assemble and keep the stable connection relation between the upper circuit board and the lower circuit board, the utility model discloses further set up as follows: the upper circuit board and the lower circuit board are fixed into a whole in an inserting mode.

The utility model discloses further set up as follows: the current transformer is clamped between the upper circuit board and the lower circuit board, the space between the upper circuit board and the lower circuit board is fully utilized, the current transformer is prevented from occupying too much space, and the whole miniaturization and the miniaturization are favorably realized.

Meanwhile, when the current transformer is positioned between the upper circuit board and the lower circuit board, the current transformer also serves as a 'pillar' and a separating component between the upper circuit board and the lower circuit board, so that the upper circuit board and the lower circuit board are ensured to be separated from each other, and the oppositely arranged structures are stable and easy to match.

In order to change the wireless connection mode of the wireless circuit, the utility model discloses further set up as follows: the wireless communication circuit adopts a wireless integrated module which is electrically plugged in an electric plug socket arranged on the upper circuit board or the lower circuit board, and the wireless integrated module is connected with the control circuit by serial communication. The wireless module integrated module is any one of a WIFI module, a ZigBee module, an NB-IOT module and a Bluetooth module.

The structure is convenient and quick for replacing the module according to the specific practical application occasion of a user by designing the wireless communication circuit into a pluggable independent integrated module.

The utility model discloses further set up as follows: the power supply circuit is a BUCK voltage reduction circuit, on one hand, the whole module of the utility model has small volume and higher requirement on the stability of a power supply system; on the other hand, the BUCK voltage reduction circuit can reduce power consumption and meet the actual use requirement.

The utility model discloses further set up as follows: electric capacity among the BUCK step-down circuit adopts at least one in ceramic chip electric capacity, polymer capacitor, monolithic electric capacity, the polypropylene ethylene electric capacity, through adopting the equal small and exquisite electric capacity of ceramic chip electric capacity, polymer capacitor, and do not use the great electrolytic capacitor of this type of volume of electrolytic capacitor, help dwindling the shared space of circuit board, make the utility model discloses whole module is further towards miniaturation.

For reducing the required space of circuit board in upper and lower direction, further reduce the volume, the utility model discloses further set up as follows: and the voltage reduction chip and the additional circuit thereof in the power supply circuit, the metering chip and the additional circuit thereof in the metering circuit, and the control chip and the additional circuit thereof in the control circuit are packaged by adopting patches.

For making the volume miniaturized, the utility model discloses further set up as follows: the electric plug is pressed between the circuit board and the cover/base, and the electric plug is directly welded on the circuit board or is electrically connected with the circuit board through an elastic electric contact mechanism.

In the structure, the electric plug is firstly crimped between the circuit board and the cover or the base, and the electric plug is connected and fixed by skillfully utilizing the clearance fit relation between the circuit board and the cover or the base, so that unnecessary space occupation is reduced. Moreover, the structure enables the electric plug to be directly connected with the circuit board, simplifies the structure and is convenient to assemble.

For the extension the utility model discloses the connected mode between module and single branch road or single equipment, the utility model discloses further set up as follows: an electric slot is arranged on the surface of the cover or the base adjacent to the electric plug, and a conducting strip is arranged at the position of the circuit board, which is right opposite to the electric slot, preferably, the conducting strip and the electric plug are integrated.

The utility model discloses further set up as follows: the base is provided with two opposite side walls, clamping protrusions/clamping grooves are formed in the side walls, and corresponding clamping grooves/clamping protrusions are formed in the side walls, opposite to the side walls of the base, of the cover.

The utility model discloses further set up as follows: the number of the openings on the cover/base/circuit board is 2 or 4, and the number of the current transformers corresponds to the number of the openings.

The utility model provides a miniature wireless measurement wireless module small in size, wiring are convenient, are convenient for cooperate the use with single branch road or single consumer with the grafting mode to satisfy the measurement demand of single branch road or single device. Because the utility model discloses simple to operate, wiring are easy, data transmission mode variety, consequently for the intensive coverage of measurement point and the diversification of measurement mode provides probably.

Drawings

Fig. 1 is a schematic diagram of the overall explosion of embodiment 1 of the present invention.

Fig. 2 is a schematic view of the whole embodiment 1 of the present invention.

Fig. 3 is a schematic bottom view of the whole body of embodiment 1 of the present invention.

Fig. 4 is a perspective view of the lid structure according to embodiment 1 of the present invention.

Fig. 5 is a perspective view of a base structure according to embodiment 1 of the present invention.

Fig. 6 is a schematic view of the assembly state of embodiment 1 of the present invention.

FIG. 7 is a schematic view of the whole embodiment 4 of the present invention

Fig. 8 is an exploded view of embodiment 4 of the present invention.

Fig. 9 is a schematic circuit diagram of an embodiment of the present invention.

Reference numerals: 1-cover, 2-external fastener, 3-upper circuit board, 4-current transformer, 5-lower circuit board, 6-electric plug, 7-base;

101-a first opening group, 102-a first clamping convex block, 103-an external buckle groove, 301-a second opening group, 302-a patch chip, 303-an electric plug pin, 501-an electric socket, 502-a third opening group, 503-a positioning angle groove, 504-a positioning hole groove, 701-a fourth opening group, 702-a first slot, 703-a clamping groove, 704-a crimping lug, 705-a second slot, 706-a positioning seat, 707-a second clamping convex block and 708-a positioning column.

Detailed Description

The utility model provides a miniature wireless metering module suitable for single branch road or single equipment electric energy measurement use, including base 7, lid 1 and circuit board. The circuit board is integrated with a power supply circuit, a control circuit, a current and voltage sampling circuit, a wireless communication circuit and a metering circuit. The output end of the current and voltage sampling circuit is electrically connected with the input end of the metering circuit, the metering circuit is in serial communication connection with the control circuit, the wireless circuit is in serial communication connection with the control circuit, and the power supply circuit supplies power for other circuits. Wherein, for realizing the sample, the current-voltage sampling circuit is including current transformer 4, all is equipped with the trompil that the position is corresponding on base 7, lid 1, the circuit board and when base 7 and lid 1 lid were closed, and the trompil on base 7, lid 1, the circuit board is connected the cooperation through a pore wall and is separated with the external world, and current transformer 4 overlaps promptly and establishes on the pore wall. The base 7 and the cover 1 are matched and clamped into a whole through a first clamping bulge 102 arranged on the cover 1 and a clamping groove 703 arranged on the base 7; or, the cover 1 is provided with a clamping groove, and the base 7 is provided with a clamping protrusion; or, the base 7 and the cover 1 are both provided with a group of clamping protrusions and clamping grooves for matching clamping.

The following is a detailed description of specific embodiments. In particular, in the present invention, the side of the cover 1 is the upper side, and the side of the base 7 is the lower side.

Embodiment 1 as shown in fig. 1, this embodiment provides a single-phase micro wireless metering module, which includes a base 7, a cover 1, an upper circuit board 3 and a lower circuit board 5, where the upper circuit board 3 and the lower circuit board 5 are disposed opposite to each other in the up-down direction, and the upper circuit board 3 and the lower circuit board 5 are disposed at a certain distance apart from each other, and meanwhile, in order to reduce the size, the front surfaces of the upper circuit board 3 and the lower circuit board 5 are opposite to each other in this embodiment — even though electronic components on the upper circuit board 3 and the lower circuit board 5 are located in a gap between the upper circuit board 3 and the lower circuit board 5, so as to fully utilize the gap. And the back surfaces of the upper circuit board 3 and the lower circuit board 5 are in clearance fit with the cover 1 and the base 7, so that the overall size is further reduced, and the volume is further reduced.

The upper circuit board 3 and the lower circuit board 5 are respectively integrated with partial circuits in a power circuit, a control circuit, a current and voltage sampling circuit, a wireless communication circuit and a metering circuit, and the circuits on the upper circuit board 3 and the lower circuit board 5 are electrically connected through an electric contact pin 303 arranged on the upper circuit board 3 and an electric socket 501 arranged on the lower circuit board 5. In one embodiment, to ensure the stability of the electrical connection between the upper circuit board 3 and the lower circuit board 5, a plug structure similar to the electrical plug pins 303 and the electrical socket 501 may be disposed on the upper circuit board 3 and the lower circuit board 5 for enhancing the mechanical connection relationship between the upper circuit board 3 and the lower circuit board 5. Among the circuits with different functions, the power supply circuit, the current and voltage sampling circuit and the metering circuit can be arranged on the upper circuit board 3, and the control circuit and the wireless communication circuit can be arranged on the lower circuit board 5, and can be adaptively adjusted according to actual conditions without being limited to the distribution mode.

In the current and voltage sampling circuit, the current transformer 4 is used as a main sampling device, in order to save space, the current transformer 4 is clamped between the upper circuit board 3 and the lower circuit board, and two wiring terminals of the current transformer 4 are connected to the circuit board where the current and voltage sampling circuit is located. Therefore, the space between the front surfaces of the upper circuit board 3 and the lower circuit board 5 is not less than the height of the current transformer 4, and the space is not too large in consideration of the volume and is slightly larger than the current transformer 4.

In order to cooperate with the current transformer 4, the cover 1, the upper circuit board 3, the lower circuit board 5, and the base 7 of this embodiment are respectively provided with a first opening group 101, a second opening group 301, a third opening group 502, and a fourth opening group 701 at corresponding positions, and since this embodiment is a single-phase measurement, the first opening group 101, the second opening group 301, the third opening group 502, and the fourth opening group 701 are respectively composed of a first opening group and a second opening group. The first opening hole and the second opening hole of the first opening hole group 101 are respectively connected with a first opening hole and a second opening hole which extend towards the base 7, and meanwhile, a first opening hole and a second opening hole which are matched and spliced with the first opening hole and the second opening hole are respectively arranged near the inner side openings of the first opening hole and the second opening hole of the fourth opening hole group 701 of the base 7.

When the cover 1 and the base 7 are assembled together with the upper circuit board 3 and the lower circuit board 5, the hole wall I sequentially passes through the first opening of the second opening group 301 on the upper circuit board 3 and the first opening of the third opening group 502 on the lower circuit board 5 and then is in sealing fit with the hole seat I, so that the first opening is communicated with and separated from an inner cavity formed by the cover 1, the base 7 and the hole wall I. The second hole wall sequentially penetrates through the second hole opening of the second hole opening group 301 on the upper circuit board 3, the current transformer 4 and the second hole opening of the third hole opening group 502 on the lower circuit board 5 and then is in sealing fit and plug-in connection with the second hole seat, so that the second hole opening is communicated with and separated from an inner cavity formed by the cover 1, the base 7 and the second hole wall. In the embodiment, the cover 1 and the base 7 are clamped or connected through a buckle connection or a screw thread connection.

In order to facilitate power taking, the base 7 of the present embodiment is provided with a first slot 702 exposed, the first slot 702 is equipped with an electrical plug 6, and the electrical plug 6 comprises a plug part exposed outside the base 7 and a connecting part for electrically connecting with the input end of the power circuit. The electrical plug 6 is directly welded on the lower circuit board 5, or the electrical connection between the electrical plug 6 and the lower circuit board 5 is realized through an elastic electrical contact mechanism. The elastic electric contact mechanism comprises a groove made of a conductive material and an elastic contact body made of the conductive material and assembled in the groove, in the embodiment, the elastic contact body is formed by bending a conductive copper sheet, the structure is simple, the processing is convenient, the elastic electric contact mechanism can also adapt to the gap between the electric plug 6 and the lower circuit board 5, and the electric connection stability at the position is ensured. Furthermore, for the purpose of optimizing the structural design and reducing the size, the electrical plug 6 is preferably disposed adjacent to the fourth set of holes 701 on the base 7.

In this embodiment, the mounting portion of the electrical plug 6 is press-fitted between the back of the lower circuit board 5 and the base 7, and meanwhile, for positioning the electrical plug 6 and keeping the electrical plug 6 and the lower circuit board 5 in close contact, a positioning convex groove is arranged on the inner side surface of the base 7 around the first slot 702, and a positioning convex block is further convexly arranged on the side wall of the positioning convex groove for assisting in pressing the pressing sheet, so that the connecting portion of the electrical plug 6 is pressed against the lower circuit board 5 after assembly. Of course, in order to expand the wiring manner, in this embodiment, a second slot 705 is further disposed near the first slot 702, the second slot 705 serves as an electrical slot, the electrical slot is disposed right opposite to the connection portion of the electrical plug 6 on the lower circuit board 5, and the connection portion of the electrical plug 6 serves as a channel for electrically connecting with the lower circuit board 5. When the power supply is used, the electric plug 6 or the electric socket can be selected to be plugged and powered according to the specific equipment and the condition of the branch.

In the above embodiment, in order to avoid the problem that the lower circuit board 5 and the upper circuit board 3 are affected by direct contact between the lower circuit board 5 and the upper circuit board 3, or the upper circuit board 3 and the lower circuit board 5 cannot dissipate heat, the base 7 and the cover 1 are respectively provided with the positioning seat 706, so that the lower circuit board 5 and the upper circuit board 3 are in clearance fit with the base 7 and the cover 1, and the heat dissipation structure can not only keep the stable assembly of the circuit boards, but also increase the heat dissipation space and improve the heat dissipation effect.

In this embodiment, the base 7 is provided with a first card slot 703 and a second card slot 707 for cooperating with the first card slot 102 and the second card slot on the cover 1 to realize the clamping connection therebetween.

In addition to the above structural design, in this embodiment, in consideration of different requirements for wireless use in different situations, to meet the requirements, the wireless circuit in this embodiment adopts a wireless integrated module, which is electrically plugged into an electrical socket provided on the upper circuit board 3 or the lower circuit board 5, and the wireless integrated module is connected with the control circuit by serial communication. The wireless module integrated module is any one of a WIFI module, a ZigBee module, an NB-IOT module and a Bluetooth module.

Embodiment 3 is to realize a micro-structure design, and this embodiment changes a circuit part, and first, in order to adapt to a miniaturized and miniaturized structure, the power supply circuit of this embodiment is a BUCK voltage reduction circuit, so as to improve the stability of power supply, and at the same time, reduce power consumption, and adapt to a miniaturized and miniaturized module design.

Secondly, the capacitors in the BUCK step-down circuit are further limited to adopt at least one of ceramic capacitors, polymer capacitors, monolithic capacitors and polystyrene capacitors, and the increase of the required installation space of the circuit board caused by the use of electrolytic capacitors is avoided. Specifically, a plurality of ceramic capacitors can be connected in series to replace one electrolytic capacitor.

The BUCK circuit of the present embodiment is shown in fig. 9, a resistor R1 is used for limiting an input surge current, a diode D2 is used for suppressing a surge, and an inductor L1 and a capacitor C5 form a filter for filtering. The BUCK voltage reduction chip U1 adopts an ST VEP series voltage converter, and a feedback compensation network consisting of a resistor R4, a capacitor C7 and a capacitor C6 is connected to the feedback end of the BUCK voltage reduction chip U1. The diode D4, the diode D1 and the capacitor C3 provide bias voltage for the BUCK BUCK chip U1, and the C4 is used for protecting the internal units of the chip and providing clean bias in the pulse group FET and ESD. Resistor R10 is a selected resistor that is selectively weldable. The output dummy load resistor R5 is used for ensuring the realization of the output voltage of the whole system 1ma and avoiding the sudden rise of the output voltage after the output load is pulled out. The capacitor C1, the capacitor C10 and the capacitor C9 are all used for outputting stable voltage, wherein C9 is a polymer capacitor, and C1 and C10 are ceramic chip capacitors.

Furthermore, a voltage reduction chip and an additional circuit thereof in the power supply circuit, a metering chip and an additional circuit thereof in the metering circuit, and a control chip and an additional circuit thereof in the control circuit are packaged by adopting patches. Therefore, the space occupied by each element on the circuit board is greatly reduced, and the size is convenient to reduce.

Through the improved design of the circuit at a plurality of places, the volume of the circuit board is further compressed.

Embodiment 4 this embodiment provides a three-phase wireless metering module, as shown in the figure, which is different from the single-phase wireless metering module in that: the first, second, third and fourth aperture groups 101, 301, 502 and 701 each have four apertures, three for passing live wires and one for passing neutral wires, and accordingly, the number of current transformers 4 is also three. As with the current transformer 4 in embodiment 1, the current transformer 4 corresponds to the position of the opening for penetrating the live wire and is penetrated by the hole wall of the opening for penetrating the live wire.

Embodiment 5 this embodiment differs from the above embodiments in that: in this embodiment, an outer fastening groove 103 is formed on one side of the cover, the outer fastening groove 103 is a slot, has a certain height, extends to a position adjacent to an upper circuit board assembled inside the outer fastening groove 103, and is provided with an outer fastening member 2 in a manner of being matched with the outer fastening groove 103. The both ends of outer fastener 2 have with the convex part of outer catching groove 103 cooperation joint to be equipped with and be used for entering into lid 1 and the inside of base 7 lid after closing and the upper surface butt of last circuit board, with the further fixed portion of pressing of last circuit board, in this embodiment, pressing is a bar arch.

To sum up, the utility model provides a wiring is convenient, small in size's miniature wireless metering module, it has combined the dual design improvement to mechanical structure and circuit structure for the volume of traditional electric energy meter is dwindled greatly, the mode of connection is more convenient, thereby can be applicable to single branch road or single equipment three-phase, one-way measurement use. In addition, different wireless modules can be replaced according to specific use occasions for use, different use requirements of different occasions are fully met, and basic devices are provided for dense coverage 1 of measuring points and diversification of measuring modes.

Claims (11)

1. The utility model provides a miniature wireless metering module, includes base, lid and circuit board, its characterized in that: the circuit board is integrated with a power supply circuit, a control circuit, a current and voltage sampling circuit, a wireless communication circuit and a metering circuit, an exposed electric plug is arranged on the base or the cover, and the electric plug is electrically connected with the input end of the power supply circuit; the current and voltage sampling circuit comprises a current transformer, the base, the cover and the circuit board are provided with openings corresponding to the positions, the openings of the base, the cover and the circuit board are provided with or are connected and matched through a common hole wall to be separated from the outside, and the current transformer is sleeved on the hole wall.

2. The miniature wireless metering module of claim 1, wherein: the electric plug is arranged adjacent to the opening on the base/cover where the electric plug is arranged; and/or the power supply circuit supplies power for other circuits, the output end of the current and voltage sampling circuit is electrically connected with the input end of the metering circuit, the metering circuit is in serial communication connection with the control circuit, and the wireless communication circuit is in serial communication connection with the control circuit.

3. The micro wireless metering module of claim 1 or 2, wherein: the circuit board comprises an upper circuit board and a lower circuit board which are arranged oppositely up and down; the circuit is arranged on the upper circuit board and the lower circuit board respectively and is electrically connected through electric plug connectors distributed on the upper circuit board and the lower circuit board relatively.

4. The miniature wireless metering module of claim 3, wherein: the upper circuit board and the lower circuit board are fixed into a whole in an inserting mode; and/or the current transformer is clamped between the upper circuit board and the lower circuit board.

5. The miniature wireless metering module of claim 1, wherein: the wireless communication circuit adopts a wireless integrated module which is electrically plugged in an electric plug socket arranged on the upper circuit board or the lower circuit board, and the wireless integrated module is connected with the control circuit by serial communication; the wireless module integrated module is any one of a WIFI module, a ZigBee module, an NB-IOT module and a Bluetooth module.

6. The micro wireless metering module of claim 1 or 5, wherein: the power supply circuit is a BUCK voltage reduction circuit.

7. The miniature wireless metering module of claim 6, wherein: the capacitor in the BUCK voltage reduction circuit adopts at least one of a ceramic capacitor, a polymer capacitor, a monolithic capacitor and a polystyrene capacitor.

8. The miniature wireless metering module of claim 1, wherein: a voltage reduction chip and an additional circuit thereof in the power supply circuit, a metering chip and an additional circuit thereof in the metering circuit, and a control chip and an additional circuit thereof in the control circuit are packaged by adopting patches; and/or the electric plug is arranged between the circuit board and the cover/base in a pressing mode, and the electric plug is directly welded on the circuit board or is electrically connected with the circuit board through an elastic electric contact mechanism.

9. The miniature wireless metering module of claim 1, wherein: an electric slot is arranged on the surface of the cover or the base adjacent to the electric plug, and a conducting strip is arranged at the position of the circuit board opposite to the electric slot.

10. The miniature wireless metering module of claim 9, wherein: the conductive tab is integral with the electrical plug.

11. The miniature wireless metering module of claim 1, wherein: the number of the openings on the cover/base/circuit board is 2 or 4, and the number of the current transformers corresponds to the number of the openings.

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