An electric power consumption measuring device

Abstract

The application relates to a power consumption measuring device, which comprises a shell composed of an upper shell and a lower shell, three mutually independent circuit boards of a bottom plate, a side plate and an upper plate arranged in the shell; an external input connector and an inter-board connector are arranged on the bottom plate and used for connecting strong current and transmitting alternating voltage signals to the side plate; a voltage transformer is arranged on the side plate and used for isolating and transforming alternating voltage and outputting weak current signals; the upper plate is stacked above the bottom plate and forms a sandwich space, a metering chip, an MCU and a two-bus communication circuit are arranged on the upper plate and used for receiving signals output by the current transformer and the voltage transformer, completing electric parameter metering and uploading; a first mounting position for mounting an alternating voltage sampling metal plate and a second mounting position for mounting a voltage detection wire are arranged on the lower shell, and the two mounting positions are alternatively mounted; a positioning structure for positioning a temperature detector is integrally formed on the inner side of the lower shell. The application has the advantages of high space utilization, sufficient strong and weak current isolation, flexible voltage sampling mode and low assembly cost.

Description

Technical Field

[0001] This invention relates to the field of power distribution monitoring equipment technology, and in particular to a power consumption measurement device. Background Technology

[0002] In power distribution systems, especially in small household distribution boxes, it is necessary to simultaneously collect voltage, current, and temperature data from multiple single-phase circuits and upload the electrical parameters and temperature status to the monitoring host via the fire protection bus to achieve power safety monitoring of the terminal circuits.

[0003] For example, CN115684700A discloses an integrated power acquisition and temperature measurement device. This solution uses an independent base bracket to achieve voltage acquisition and contact temperature measurement for a single circuit. To achieve dual-circuit monitoring, multiple independent brackets need to be assembled on the same PCB board. This solution is a single-layer PCB layout, with the high-voltage power acquisition conductor and the low-voltage temperature measurement and metering circuit arranged on the same printed circuit board, which imposes stringent safety design requirements on PCB creepage distance and electrical clearance.

[0004] Due to the constraints of the housing size, the aforementioned single-layer PCB layout results in a crowded arrangement of components, making it difficult to simultaneously acquire dual-channel voltage, current, and temperature data within a confined space. The mixed arrangement of high-voltage components and low-voltage chips leads to significant electromagnetic interference and complicates safety compliance compliance. To achieve multi-channel data acquisition, some products require stacking multiple independent modules, consuming substantial rail space and resulting in high material and assembly costs.

[0005] In existing technologies, during assembly, the common methods for connecting circuit breakers are either to directly press the circuit breaker terminals with an internal metal plate or to use external leads for voltage sampling. Both methods typically require separate molds to produce two sets of housings, resulting in high mold costs and non-interchangeable production lines.

[0006] In addition, the voltage isolation transformers and large-volume passive components of existing products are directly placed on the signal processing circuit board, which takes up the board space of metering chips, MCUs and communication circuits; the high-voltage circuit is directly exposed in the signal processing board area, and once an abnormality occurs on the high-voltage side, it is easy to impact the downstream low-voltage metering and communication circuits, which poses a hidden danger to the reliability of the equipment.

[0007] Regarding temperature sensor mounting structures, existing technologies mostly rely on independent bracket accessories for sensor positioning. For example, the metal plate in CN115684700A also requires an independent bracket accessory for mounting, and subsequent glue application is needed for further fixation. This independent accessory setup encroaches on the already limited mounting space within the housing, while also increasing the number of parts and assembly steps, thus increasing assembly costs.

[0008] In summary, existing technologies suffer from drawbacks such as large installation space requirements, insufficient electrical safety, and high assembly costs, and urgently need improvement. Summary of the Invention

[0009] To address the aforementioned problems, the present invention aims to provide a power consumption detection device capable of sampling current, voltage, and temperature of a circuit within a compact housing. Furthermore, the housing is designed to accommodate both direct metal plate contact and external wire connection methods for voltage sampling, facilitating installation. Simultaneously, the circuit layout is optimized to fully utilize the installation space within the housing, achieving physical separation of strong and weak current circuits.

[0010] A power consumption measuring device includes a housing consisting of an upper housing and a lower housing; a circuit board is provided inside the housing, and the circuit board includes a bottom plate, a side plate and a top plate that are independently arranged.

[0011] The housing is provided with two through holes for the phase wire or neutral wire of the circuit under test to pass through, and at least one through hole is provided with a through-type current transformer.

[0012] The base plate is fixed inside the housing and is a high-voltage power input connector board, used to connect to high-voltage power externally and convert AC voltage signals internally. The base plate is equipped with external input connectors and inter-board connectors.

[0013] The side plate is erected on the side of the base plate, and a voltage transformer is provided on it. The primary side of the voltage transformer is electrically connected (high voltage) to the AC voltage signal connected to the base plate via the inter-plate connector, which is used to isolate and transform the AC voltage and output a low voltage signal.

[0014] The upper plate is stacked on top of the bottom plate, forming a mezzanine space between them to accommodate large-volume components. The upper plate is equipped with a metering chip, an MCU, and a two-bus communication circuit. The metering chip is used to receive signals output by the current transformer and the voltage transformer and to complete electrical parameter measurement. The MCU and the two-bus communication circuit are used to upload the measurement results and temperature status to the monitoring host.

[0015] The lower housing has an integrally formed positioning structure on its inner side for positioning the temperature detector. The probe of the temperature detector is located inside the positioning structure and faces the pin of the AC voltage sampling metal plate or voltage detection wire.

[0016] Preferably, the positioning structure is located on the inner bottom of the lower housing and includes a recessed groove and a figure-eight pressure block. The probe of the temperature detector is located in the installation space formed between the lower housing and the lower plate and is positioned by the recessed groove and the figure-eight pressure block.

[0017] Preferably, the lower housing is provided with a first mounting position for mounting an AC voltage sampling metal plate, and the first mounting position is provided with a limiting structure for positioning and mounting the AC voltage sampling metal plate; after the bottom plate is installed in place, the gap between it and the lower housing forms an installation space, and the first mounting position is located within the installation space;

[0018] The base plate is provided with a first through hole, the position of which corresponds to the probe of the temperature detector; the first end of the AC voltage sampling metal plate is provided with a connecting pin facing the base plate. When the AC voltage sampling metal plate is installed, the first end of the AC voltage sampling metal plate is limited and fixed within the limiting structure, and the connecting pin is inserted into and welded to the first through hole, so that the connecting pin and the probe of the temperature detector are spatially opposite to each other.

[0019] Preferably, the base plate has a first through hole on one side of the first through hole, and the lower housing has a second through hole; after the base plate is installed in place, the centers of the first through hole and the second through hole are offset axially.

[0020] When the voltage detection wire is installed, one end of the voltage detection wire is soldered to the first through hole, and the pin of the wire extends through the first through hole into the installation space, and is spatially opposite to the probe of the temperature detector; the other end of the voltage detection wire passes through the first through hole and the second through hole in sequence and is led out and connected to the circuit breaker terminal; the first through hole serves as a voltage signal connection point shared by the two voltage sampling methods.

[0021] Preferably, the limiting structure includes multiple sets of limiting ribs integrally formed on the lower housing, the multiple sets of limiting ribs forming an accommodating cavity for limiting the first end of the AC voltage sampling metal plate from the circumference and above, and for limiting it from below by the bottom surface of the lower housing.

[0022] Preferably, the AC voltage sampling metal plate includes an integrally formed first end, a second end, a neck, and a connecting pin, wherein the first end and the second end are connected through the neck, and the width of the first end is greater than the width of the neck.

[0023] The first end passes through the threading hole and is inserted into the receiving cavity. The peripheral wall of the threading hole is recessed to form a notch corresponding to the position of the neck. The connecting pin is bent upward and passes through the corresponding connecting hole on the base plate before being welded and fixed.

[0024] Preferably, the positioning structure for positioning the temperature detector, the first mounting position, and the second mounting position on the lower housing are connected to each other, and heat dissipation holes are provided between the positioning structure and the first mounting position and the second mounting position.

[0025] Preferably, the upper plate and the side plate, as well as the side plate and the bottom plate, are fixed by welding with connecting pins to achieve mechanical fixation and electrical connection.

[0026] Preferably, at least the upper plate and the side plate are provided with mutually cooperating protrusions and notches for positioning and fitting.

[0027] Preferably, the external input connectors and inter-board connectors on the base plate include:

[0028] Two-bus terminals used for transferring fire protection two-bus signals and connecting to external wires;

[0029] Neutral wire connector for connecting the neutral wire and outputting it to the side panel; and

[0030] The external input connectors corresponding to the first and second live wire high voltage inputs and their corresponding inter-board connectors are respectively used to transmit the AC voltage signal of the corresponding live wire to the side plate.

[0031] This invention divides the circuit board into three independent but collaborative layers: a base plate, side plates, and a top plate. The base plate is solely for high-voltage input and inter-board transmission, sending high-voltage signals to voltage transformers on the side plates for isolation and transformation, converting them into low-voltage signals before supplying them to the metering chip on the top plate for processing. The side plates physically form an isolation barrier, and the top plate, stacked above the base plate, creates a mezzanine space to accommodate large-volume components. The voltage transformers are mounted on the side plates, fully utilizing this mezzanine space and significantly improving the internal space utilization rate. Simultaneously, the integrated positioning structure on the lower housing replaces the traditional independent bracket, reliably positioning the temperature detector, reducing the number of parts and assembly steps, without occupying additional space, thus facilitating overall miniaturization. Furthermore, the lower housing features a fixing structure for the applicable voltage metal plate, and the first through hole on the base plate is positioned as the sampling connection point corresponding to the temperature detector probe. Both voltage sampling methods share this through hole and positioning structure. Wire installation only requires adding a through hole to the fixing structure of the metal plate, resulting in a simple structure. This allows the same housing and circuit board assembly to be compatible with both internal metal plate crimping sampling and external lead wire sampling modes, eliminating the need for separate molds for different sampling methods, significantly reducing mold costs and inventory management difficulties. Production lines can use this technology interchangeably, and assembly is flexible. These structural features work together to ensure electrical safety while achieving compact, modular, and low-cost multi-circuit power consumption monitoring, making it particularly suitable for space-sensitive applications such as small household distribution boxes. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of this application;

[0033] Figure 2 This is a structural diagram of the present application with the upper shell concealed.

[0034] Figure 3 This is a schematic diagram of the inner structure of the lower shell;

[0035] Figure 4 This is a schematic diagram showing the installation of the temperature detector on the lower housing.

[0036] Figure 5 A schematic diagram showing the installation of the AC voltage sampling metal plate on the lower housing;

[0037] Figure 6 for Figure 5 A sectional view;

[0038] Figure 7 This is a schematic diagram showing the installation of the AC voltage sampling metal plate and the lower plate.

[0039] Figure 8 This is a schematic diagram of the installation of the voltage sensing wire;

[0040] Figure 9 A schematic diagram of the voltage detection wire installation at another angle;

[0041] Figure 10 This is a schematic diagram of the circuit breaker input port installed according to this application;

[0042] Figure 11 This is a schematic diagram of the circuit breaker output port installed according to this application;

[0043] Figure 12 This is a schematic diagram of the circuit breaker structure connected to the AC voltage sampling metal plate in this application;

[0044] Figure 13 This is a schematic diagram of the circuit breaker connected via a voltage measuring wire, as per this application.

[0045] Figure 14 This is the circuit schematic of the baseboard;

[0046] Figure 15 This is the circuit diagram for the side panel;

[0047] Figure 16 This is a block diagram of a two-channel voltage sampling circuit.

[0048] Figure 17 This is a block diagram of a two-channel current sampling circuit.

[0049] Figure 18 This is the circuit diagram for the power calculation module;

[0050] Figure 19 Main control circuit module diagram;

[0051] Figure 20 This is a diagram of the fire protection two-wire bus circuit module;

[0052] Figure 21 This is a schematic diagram of a two-channel temperature sampling circuit module.

[0053] Figure label:

[0054] Upper housing 1, lower housing 2, bottom plate 100, side plate 200, top plate 300, temperature detector 400, AC voltage sampling metal plate 500, first end 501, second end 502, neck 503, connecting pin 504, wire hole 3, current transformer 600, voltage transformer 700, voltage measuring wire 800, positioning structure 8, recessed groove 81, figure-eight pressure block 82, limit stop rib 111, heat dissipation hole 12. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0056] In the description of this invention, the terms "upper," "lower," "bottom," "side," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limiting the invention. The terms "first," "second," etc., 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.

[0057] The present invention provides a power consumption measurement device, such as... Figure 1 As shown, it includes a shell consisting of an upper shell 1 and a lower shell 2, combined with Figure 2 The housing contains a circuit board, which includes a base plate 100, a side plate 200, and a top plate 300, all independently arranged. The housing is flat and its dimensions are adapted to the standard DIN rail mounting space in a small household electrical distribution box. The housing has two through holes 3 for the phase wires of the circuit under test to pass through, and two through-hole current transformers 600 are installed at each of the two through holes 3. A first positioning post is provided inside the housing corresponding to the two through holes 3, and the current transformers 600 are mounted inside the housing via the first positioning post.

[0058] like Figure 3As shown, in this embodiment, the lower housing 2 is in the form of a cover plate and is detachably connected to the upper housing 1 by a snap-fit. The upper plate 300 is positioned to the upper housing 1 by a second positioning post integrally formed on the upper housing 1, and the bottom plate 100 is positioned to the lower housing 2 by a second positioning post integrally formed on the lower housing 2. This eliminates the need for additional screws or other fasteners to fix the circuit board to the housing, making installation convenient.

[0059] The base plate 100 is fixed inside the lower housing 2. It is a rectangular flat plate and serves as a high-voltage power connection connector board, used only for external high-voltage power connection and internal AC voltage signal conversion. Specifically, as shown... Figure 14 As shown, the base plate 100 is equipped with multiple external input connectors and inter-panel connectors. Connectors CN200 and CN201 are external input terminals for the fire protection bus 2, with pins 1 and 2 directly connected for connecting external fire protection bus 2 signals. These signals are then transferred to the upper plate 300 via the inter-panel connector on the base plate 100. Connectors CN202 (neutral wire connection) and CN203 (neutral wire to side plate connection) are neutral wire loop connectors, with pins 1 and 2 interconnected. This allows the output of the external neutral wire to the side plate 200 after connection, providing a neutral wire reference potential for two-channel voltage sampling. Connector CN204 is the external input connector for phase A live wire, and connector CN205 is the corresponding inter-panel connector used to transmit the phase A live wire AC_A high-voltage signal to the side plate 200. Connector CN206 is the external input connector for phase B live wire, and connector CN207 is the corresponding inter-panel connector used to transmit the phase B live wire AC_B high-voltage signal to the side plate 200. In this way, the base plate 100 centrally positions all external high-voltage wiring at the bottom of the housing, making full use of the space at the bottom of the housing, while also centrally managing the high-voltage wiring and preventing high-voltage signals from passing through low-voltage areas. In particular, the high-voltage lines on the base plate 100 are arranged on the lower surface of the base plate, which allows for reliable electrical isolation between high-voltage power and the coil (current inductor coil).

[0060] Side panel 200 is erected to the side of base plate 100, and the two are mechanically fixed and electrically connected by bent pin connectors. Side panel 200 is generally a vertical plate, with its surface perpendicular to both base plate 100 and upper plate 300, to fully utilize the space between base plate 100 and upper plate 300. Figure 15As shown, the side plate 200 is equipped with two voltage transformers 700 (L100, L101) and their surrounding high voltage current limiting resistors, which are used to realize the isolation transformation from high voltage to low voltage. Specifically, in the A-phase voltage path, the AC_A high-voltage signal from the inter-board connector CN205 on the base plate 100 is introduced into the side plate 200 via connector CN100, and then connected to one end of the primary side of the voltage transformer 700 (L100) after passing through the high-voltage current-limiting resistor R100. The neutral wire from the base plate 100 is introduced into the other end of the primary side of the transformer 700 (L100) via connector CN203. In the B-phase voltage path, the AC_B high-voltage signal from the inter-board connector CN207 on the base plate 100 is introduced into the side plate 200 via connector CN101, and then connected to one end of the primary side of the voltage transformer 700 (L101) after passing through the high-voltage current-limiting resistor. The neutral wire is connected to the other end of the primary side of the transformer 700 (L101) via connectors CN202 and CN203. Voltage transformers 700 (L100, L101) are both current-type voltage transformers. A current-limiting resistor connected in series on the high-voltage side converts the AC voltage into a small mA-level current. After electromagnetic isolation by the transformer, isolated AC low-voltage signals UA and UB are output on the secondary side, achieving complete electrical isolation between the high-voltage grid and the subsequent low-voltage circuits. The isolated low-voltage signals UA and UB, along with their common ground GND, are transmitted to the upper board 300 via the board-to-board connector CN103. Through this setup, all high-voltage electricity is blocked on the side board 200, allowing the isolated UA and UB low-voltage signals to flow to the upper board 300. This protects the metering chip and MCU on the upper board 300 from high-voltage surges, meeting safety creepage distance requirements. Furthermore, given the relatively large size of the voltage transformers 700 (L100, L101), mounting them on the vertically positioned side board 200 fully utilizes the space between the upper board 300 and the base board 100, avoiding encroachment on the upper board 300's board area.

[0061] The upper plate 300 is stacked on top of the bottom plate 100, forming a space between them to accommodate large components such as voltage transformers 700 (L100, L101) on the side plate 200. The upper plate 300 and the side plate 200, as well as the side plate 200 and the bottom plate 100, are fixed together by welding with connecting pins to achieve mechanical fixation and electrical connection. Furthermore, at least on the upper plate 300 and the side plate 200, there are mating protrusions and notches for positioning and ensuring welding accuracy. Figures 16-21 As shown, the upper board 300 is the core board for low-voltage processing. It houses the metering chip U41, the main control MCU U10, the two-bus communication circuit, as well as the current sampling circuit, voltage sampling circuit, and temperature sampling circuit. All signal processing functions are completed on the upper board 300.

[0062] Specifically, the upper board 300 is equipped with connector CN53 for receiving isolated low-voltage signals UA and UB from the inter-board connector CN103 of the side board 200. The UA signal, after passing through an RC filter circuit consisting of resistors R59 and R60 and capacitor C57, outputs a filtered voltage signal UAP, which is then sent to the voltage sampling input terminal of the metering chip U41. The UB signal, after passing through an RC filter circuit consisting of resistors R61 and R62 and capacitor C58, outputs a filtered voltage signal UBP, which is then sent to another voltage sampling input terminal of the metering chip U41. The upper board 300 is also equipped with connectors CN51 and CN52, which are used to connect the secondary winding signals of current transformer 600 (channel A) and current transformer 600 (channel B), respectively. The secondary current of the current transformer 600 flows through a sampling resistor network and is converted into corresponding voltage signals. After passing through an RC filter circuit, the output current signals IAP, IAN, IBP, and IBN are sent to the two current sampling input terminals of the metering chip U41, respectively. The metering chip U41 uses a dedicated power metering integrated circuit, which integrates two independent analog-to-digital converters and a digital signal processor to receive the two voltage signals and two current signals mentioned above, and to calculate the electrical parameters such as voltage, current, active power, reactive power, power and power factor of each circuit. The calculation results are sent to the main control MCUU10 through the communication interface.

[0063] The upper panel 300 is also equipped with a fire protection two-wire communication circuit, such as... Figure 20As shown, the circuit includes connector CN1, fuse F1, bidirectional TVS diode D1, rectifier bridge MB8F, transistor Q1, electrolytic capacitor EC1, and two-bus communication chip U2. Connector CN1 receives the fire alarm two-bus signal from the base plate 100. This signal undergoes overcurrent and surge protection via fuse F1 and bidirectional TVS diode D1, and is then rectified by rectifier bridge MB8F to achieve polarity-free connection of the two-bus, meaning it can operate normally regardless of the external two-bus connection orientation. One path of the rectified signal draws DC voltage from the two-bus through a power supply circuit consisting of transistor Q1 and electrolytic capacitor EC1 to power the device; the other path connects to the signal terminal of the two-bus communication chip U2. The signal terminal of the two-bus communication chip U2 interacts with the communication interface of the main control MCU U10, enabling bidirectional data communication between this device and the two-bus host. The upper board 300 also includes a temperature sampling circuit, comprising connectors CN71 and CN72, for connecting an external NTC thermistor temperature probe, i.e., temperature detector 400. This temperature probe is correspondingly located in the positioning structure 8 of the lower housing 2. The NTC thermistor is connected in series with pull-up resistors R71 and R72 on the upper board 300 to divide the voltage. The NTC resistance value changes with temperature, which is converted into a changing voltage signal. After being filtered by capacitors C71 and C72, the temperature signals TMPRA and TMPRB are output to the ADC pin of the main control MCUU10. The main control MCUU10 then performs analog-to-digital conversion and numerical calculation of the contact temperature.

[0064] The main control MCU U10 communicates with the metering chip U41 via a communication interface to read electrical parameter data from each circuit. Simultaneously, it reads temperature sampling values ​​through the ADC pin and interacts with the two-bus communication chip U2, uploading metering results and temperature status to the monitoring host via the fire alarm two-bus. The upper board 300 also features LED indicators and a program download interface CN10, used to indicate the device's operating status and for firmware upgrades, respectively. The entire upper board 300 is powered by the two-bus power supply circuit, achieving dual-power redundancy and ensuring that the device can still report fault information via the two-bus in the event of a mains power failure.

[0065] The structure of the lower housing 2 will be described in further detail below. Figures 3-6As shown, the inner side of the lower housing 2 is integrally injection molded with a positioning structure 8 for positioning the temperature detector 400. This positioning structure 8 includes a recessed groove 81 and a figure-eight pressure block 82. The probe of the temperature detector 400 is positioned by the recessed groove 81 and the figure-eight pressure block 82, without the need for any independent support accessories. The positioning structure 8 is positioned close to the pins of the voltage sampling component, allowing the probe of the temperature detector 400 to accurately align with the pin position and accurately detect the temperature rise at the circuit breaker hole where the copper plate (AC voltage sampling metal plate) is located, preventing abnormalities caused by poor contact. Inserting the copper plate into the hole is equivalent to inserting the temperature sensor into the hole to measure the temperature rise. The temperature detector 400 is connected to the temperature sampling circuit of the upper board 300. It should be noted that, in the embodiment using the AC voltage sampling metal plate 500, the pin of the voltage sampling component is the connecting pin 504 of the AC voltage sampling metal plate 500. This connecting pin 504 passes through the first through-hole on the base plate 100 and extends into the mounting space between the lower housing 2 and the base plate 100, spatially opposite to the probe of the temperature detector 400. In the embodiment using the voltage detection wire 800, one end of the voltage detection wire 800, soldered to the first through-hole, also passes through the first through-hole and extends into the mounting space, spatially opposite to the probe of the temperature detector 400. That is, regardless of the voltage sampling method used, the first through-hole serves as a common voltage signal connection point, and the probe of the temperature detector 400 always faces this position to accurately detect the heating state of the voltage sampling component.

[0066] The lower housing 2 has a first mounting position for mounting the AC voltage sampling metal plate 500 and a second mounting position for mounting the voltage detection wire 800. The AC voltage sampling metal plate 500 and the voltage detection wire 800 can be selectively mounted in their respective mounting positions to accommodate two different field wiring requirements: internal metal plate crimping sampling and external lead wire sampling. The first and second mounting positions partially overlap spatially, achieving space reuse and saving limited space resources within the housing. Furthermore, since the lower housing 2 and the base plate 100 have sufficient mounting space, simultaneously providing the first and second mounting positions does not increase the volume of the housing.

[0067] like Figures 5-7As shown, the first mounting position is provided with a limiting structure, which includes multiple sets of limiting ribs 111 integrally formed on the lower housing 2. The multiple sets of limiting ribs 111 form a receiving cavity, which is used to limit the first end 501 of the AC voltage sampling metal plate 500 from the circumference and above, and to limit it from below by the bottom surface of the lower housing 2. In a specific embodiment, the limiting rib 111 includes a front protruding block, a rear stop edge, an upper pressing stop edge, and a side stop edge, wherein the side stop edge also cooperates with the side guide of the AC voltage sampling metal plate 500. The base plate 100 is provided with a first through hole, the position of which corresponds to the probe of the temperature detector 400. When the AC voltage sampling metal plate 500 is installed, the first end 501 of the AC voltage sampling metal plate 500 is limited and fixed in the receiving cavity of the limiting structure. The AC voltage sampling metal plate 500 includes an integrally formed first end 501, a second end 502, a neck 503, and a connecting pin 504. The first end 501 and the second end 502 are connected by the neck 503, and the width of the first end 501 is greater than the width of the neck 503. The first end 501 passes through a wire hole 3 on the housing and is inserted into the receiving cavity of the limiting structure. The peripheral wall of the wire hole 3 is recessed to form a notch corresponding to the position of the neck 503, so as to avoid the neck 503 and provide positioning guidance for the metal plate. The connecting pin 504 is bent upward and inserted into the first through hole on the base plate 100 and then welded and fixed, so that the connecting pin 504 and the probe of the temperature detector 400 are spatially opposite to each other, thereby mechanically fixing the AC voltage sampling metal plate 500 and electrically connecting it to the voltage sampling line on the base plate 100, while ensuring that the temperature detector 400 can accurately detect the temperature rise of the voltage sampling component at the connecting pin 504.

[0068] like Figures 8-9As shown, when the voltage detection wire 800 is installed, a first through hole is provided on one side of the first through hole on the base plate 100, and a second through hole is provided on the lower housing 2. After the base plate 100 is installed in place, the centers of the first through hole and the second through hole are offset axially. One end of the voltage detection wire 800 is soldered to the first through hole, and the lead at this end passes through the first through hole and extends into the installation space between the lower housing 2 and the base plate 100, spatially opposite to the probe of the temperature detector 400. The other end of the voltage detection wire 800 is routed in a U-shape above the base plate 100, and then passes through the first through hole and the second through hole in sequence to be led out and connected to the circuit breaker terminal. Because the centers of the first through hole and the second through hole are offset axially, the voltage detection wire 800 forms a bending path during the outward process, which limits and buffers the stress on the soldered end, effectively preventing the solder joint from falling off when the wire is pulled by external force, and improving the reliability of the connection. The first through-hole serves as a shared voltage signal connection point for both sampling methods. Regardless of whether the AC voltage sampling metal plate 500 or the voltage detection wire 800 is installed, the probe of the temperature detector 400 faces this first through-hole to detect the heating state of the voltage sampling component. Both voltage sampling methods share the same housing and base plate 100, achieving mold sharing.

[0069] In this embodiment, the positioning structure 8, the first mounting position and the second mounting position for positioning the temperature detector 400 on the lower housing 2 are connected to each other, and a heat dissipation hole 12 is provided between the positioning structure 8 and the first mounting position and the second mounting position to facilitate heat dissipation.

[0070] The power consumption measuring device of the present invention can be flexibly installed at the output port of a circuit breaker during installation and use, such as... Figure 11 It can also be installed at the input port of the circuit breaker, such as... Figure 10 It can operate normally in both installation directions, unrestricted by the direction of the circuit breaker's incoming and outgoing lines. On-site construction personnel can choose the most convenient installation method based on the actual wiring situation in the distribution box, greatly improving the adaptability and flexibility of on-site installation. When the device is installed at the output end of the circuit breaker, its voltage sampling component directly contacts the terminals on the outgoing side of the circuit breaker, monitoring the voltage on the load side and the temperature rise of the terminals in real time. When the device is installed at the input end of the circuit breaker, its voltage sampling component directly contacts the terminals on the incoming side of the circuit breaker, monitoring the voltage on the power supply side and the temperature rise of the terminals in real time.

[0071] In specific application scenarios, the device provided by this invention can be used to simultaneously detect two independent circuits, or it can be used to detect only a single circuit as needed. In single-circuit detection mode, simply insert the phase wire of the monitored circuit into the corresponding live wire through hole 3, and replace the relevant sampling circuit of the other circuit with the neutral wire. No external neutral wire is required. This only requires replacing the base plate. The circuit connected to the neutral wire on the base plate is slightly different. One voltage transformer and one current coil on the side plate 200 are reduced (of course, it does not matter if they are not reduced). The three-layer board structure of the base plate 100, side plate 200, and upper plate 300, as well as the overall structure of the housing, do not need to be changed. The same hardware platform can cover both single-circuit and dual-circuit application requirements. Of course, since only a single circuit needs to be detected in this embodiment, the two voltage sampling circuits and two current sampling circuits on the upper plate can also be adapted to be changed to one.

[0072] Regarding the wiring method for voltage sampling, this invention provides two optional implementation methods to adapt to different field conditions and user preferences. In the first implementation method, as shown... Figure 12 The voltage is collected by directly pressing an AC voltage sampling metal plate 500 against the circuit breaker terminals. The first end 501 of the metal plate passes through the wire hole 3 and is fixed in the limiting structure of the lower housing 2. A connecting pin 504 passes through the first through hole on the base plate 100 and is welded in place. The second end 502 extends out of the housing and is directly pressed against the circuit breaker terminals, achieving reliable electrical contact. This method is compact, requires no external wiring, and is particularly suitable for confined distribution box environments. In the second embodiment, as... Figure 13 As shown, voltage is collected by connecting a voltage detection wire 800 to the circuit breaker terminals. One end of the wire is soldered to the first through hole on the base plate 100, and the other end passes through the first through hole on the base plate 100 and the second through hole on the lower housing 2 before being led out and connected to the circuit breaker terminals. This method is not limited by the shape and installation position of the metal plate, and the wiring is flexible. It is particularly suitable for situations where the circuit breaker terminals are irregularly arranged or the metal plate is difficult to directly crimp. The two voltage sampling methods share the same housing and circuit board assembly. The manufacturer only needs to open one set of molds and prepare one set of materials to meet the needs of both voltage sampling methods at the same time, which significantly reduces mold costs and production line management costs.

[0073] The following description describes the overall signal flow of this invention. External wiring includes phase A live wire, phase B live wire, neutral wire, and fire alarm bus, all connected to the corresponding external input connectors on the base plate 100. The base plate 100 transmits the AC_A and AC_B live wire high-voltage power and the neutral wire to the side plate 200 via the inter-board connector, while simultaneously transferring the fire alarm bus signal to the upper plate 300. Two voltage transformers 700 (L100, L101) on the side plate 200 isolate and transform the phase A and phase B voltages respectively, outputting isolated low-voltage signals UA and UB to the upper plate 300. The metering chip U41 on the upper board 300 receives the UA and UB voltage signals from the side board 200 and the secondary current signals from the two through-type current transformers 600, completing the independent metering of each electrical parameter. The main control MCU U10 reads the contact temperature collected by the NTC temperature probe, i.e., the temperature detector 400, through the on-chip ADC, and at the same time reads the electrical parameter data of the metering chip U41 through the communication interface. After summarizing the voltage, current, energy, temperature and fault information, the main control MCU U10 reports it to the monitoring host through the two-bus communication chip U2 and the fire two-bus, realizing the power safety monitoring of the end circuit.

[0074] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A power consumption measuring device, characterized in that, It includes a housing consisting of an upper housing and a lower housing; the housing contains a circuit board, which includes a bottom plate, a side plate and a top plate that are independently arranged. The housing is provided with two through holes for the phase wire or neutral wire of the circuit under test to pass through, and at least one through hole is provided with a through-type current transformer. The base plate is fixed inside the housing and is a high-voltage power input connector board, used to connect to high-voltage power externally and convert AC voltage signals internally. The base plate is equipped with external input connectors and inter-board connectors. The side plate is erected on the side of the base plate, and a voltage transformer is provided on it. The primary side of the voltage transformer is electrically connected to the AC voltage signal connected to the base plate via the inter-plate connector, which is used to isolate and transform the AC voltage and output a weak electrical signal. The upper plate is stacked on top of the bottom plate, forming a mezzanine space between them to accommodate large-volume components. The upper plate is equipped with a metering chip, an MCU, and a two-bus communication circuit. The metering chip is used to receive signals output by the current transformer and the voltage transformer and to complete electrical parameter measurement. The MCU and the two-bus communication circuit are used to upload the measurement results and temperature status to the monitoring host. The lower housing has an integrally formed positioning structure on its inner side for positioning the temperature detector. The probe of the temperature detector is located inside the positioning structure and faces the pin of the AC voltage sampling metal plate or voltage detection wire.

2. The power consumption measuring device according to claim 1, characterized in that, The positioning structure is located on the inner bottom of the lower housing and includes a recessed groove and a figure-eight pressure block. The probe of the temperature detector is located in the installation space formed between the lower housing and the lower plate and is positioned by the recessed groove and the figure-eight pressure block.

3. The power consumption measuring device according to claim 1, characterized in that, The lower housing is provided with a first mounting position for mounting an AC voltage sampling metal plate. The first mounting position is provided with a limiting structure for positioning and mounting the AC voltage sampling metal plate. After the bottom plate is installed in place, the gap between it and the lower housing forms an installation space, and the first mounting position is located within this installation space. The base plate is provided with a first through hole, the position of which corresponds to the probe of the temperature detector; the first end of the AC voltage sampling metal plate is provided with a connecting pin facing the base plate. When the AC voltage sampling metal plate is installed, the first end of the AC voltage sampling metal plate is limited and fixed within the limiting structure, and the connecting pin is inserted into and welded to the first through hole, so that the connecting pin and the probe of the temperature detector are spatially opposite to each other.

4. The power consumption measuring device according to claim 3, characterized in that, The base plate has a first through hole on one side of the first through hole, and the lower housing has a second through hole; after the base plate is installed in place, the centers of the first through hole and the second through hole are offset axially. When the voltage detection wire is installed, one end of the voltage detection wire is soldered to the first through hole, and the pin of the wire extends through the first through hole into the installation space, and is spatially opposite to the probe of the temperature detector; the other end of the voltage detection wire passes through the first through hole and the second through hole in sequence and is led out and connected to the circuit breaker terminal; the first through hole serves as a voltage signal connection point shared by the two sampling methods.

5. The power consumption measuring device according to claim 3, characterized in that, The limiting structure includes multiple sets of limiting ribs integrally formed on the lower housing. The multiple sets of limiting ribs form a receiving cavity, which is used to limit the first end of the AC voltage sampling metal plate from the circumference and above, and to limit it from the bottom surface of the lower housing from below.

6. The power consumption measuring device according to claim 5, characterized in that, The AC voltage sampling metal plate includes an integrally formed first end, a second end, a neck, and a connecting pin. The first end and the second end are connected through the neck, and the width of the first end is greater than the width of the neck. The first end passes through the threading hole and is inserted into the receiving cavity, and the peripheral wall of the threading hole is recessed to form a notch corresponding to the position of the neck; The connecting pin is bent upwards and passed through the corresponding connecting hole on the base plate before being welded and fixed.

7. The power consumption measuring device according to claim 1, characterized in that, The positioning structure on the lower housing for positioning the temperature detector and the installation space where the first mounting position is located are connected to each other, and the lower housing is provided with heat dissipation holes that connect to the installation space.

8. The power consumption measuring device according to claim 1, characterized in that, The upper plate and the side plate, as well as the side plate and the bottom plate, are fixed together by welding with connecting pins to achieve mechanical fixation and electrical connection.

9. The power consumption measuring device according to claim 8, characterized in that, At least the upper plate and the side plate have mutually cooperating protrusions and notches for positioning and fitting.

10. The power consumption measuring device according to claim 1, characterized in that, The external input connectors and inter-board connectors on the base plate include: Two-bus terminals used for transferring fire protection two-bus signals and connecting to external wires; Neutral wire connector for connecting the neutral wire and outputting it to the side panel; and The external input connectors corresponding to the first and second live wire high voltage inputs and their corresponding inter-board connectors are respectively used to transmit the AC voltage signal of the corresponding live wire to the side plate.

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