Micro-miniature electric energy meter with stable on-off capability in heavy-load working scene

Abstract

The utility model relates to a microminiature electric energy meter with stable on-off capability in a heavy-load working scene, and belongs to the field of electric energy metering. The electric energy meter comprises a main control chip SoC1, a relay driving circuit 2, a magnetic latching relay 3, a current sampling circuit 4, a power supply module 5 and a display module 6. And the main control chip SoC1 is connected with the relay driving circuit 2, and controls the on-off of the magnetic latching relay 3 through QA and QB signal lines. The current sampling circuit 4 is connected to a live wire of the magnetic latching relay 3 and used for collecting current signals. The power module 5 provides working power for the electric energy meter, and the display module 6 displays metering information. According to the utility model, stable on-off of the electric energy meter under large load is realized through the magnetic latching relay 3, and accurate metering is ensured. The electric energy meter can be applied to the fields of residents, business, industry and the like, and has a wide application prospect.

Description

Technical Field

[0001] The utility model belongs to the field of electric energy metering, and relates to a micro electric energy meter with stable on-off ability in high-load working scenarios. Background Technique

[0002] In the existing power metering system, the maximum working current load of single-phase electric energy meters is usually designed to be below 72A. However, with the improvement of residents' living standards and the increase in the number of household appliances, especially in the commercial and industrial fields, the grid load has gradually increased. This makes traditional electric energy meters vulnerable to electromagnetic interference when facing currents exceeding their rated loads, resulting in abnormal operation of relays or even burning of contacts, and unable to ensure stable on-off performance. These problems will not only affect the metering accuracy of electric energy meters but also may cause the electric energy meters to malfunction.

[0003] Especially in high-load working scenarios, an electric energy meter that can maintain stable on-off ability at high current loads is needed. However, the stability and reliability of electric energy meters on the market currently, especially micro electric energy meters, are still a challenge in high-load scenarios. This is mainly because the relays or switch devices used in existing electric energy meters may not maintain good performance under high voltage and large current, affecting the stability and accuracy of electric energy meters. Therefore, a new design of electric energy meter is needed that can maintain stable on-off ability in high-load working scenarios while maintaining a small volume and high reliability. Content of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a micro electric energy meter with stable on-off ability in high-load working scenarios, which is used to ensure that the electric energy meter used in combination with it can still accurately measure in high-load scenarios. A magnetic latching relay with a maximum current load of 90A is used to ensure that the electric energy meter used in combination with it can still accurately measure in high-load scenarios.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A micro electric energy meter with stable on-off ability in high-load working scenarios, including a main control chip SoC1, a relay driving module 2, a magnetic latching relay 3, a signal acquisition module 4, a power supply module 5, and a display module 6;

[0007] The signal acquisition module 4 is connected to the live wire of the magnetic latching relay 3 for collecting current signals;

[0008] The main control chip SoC1 is connected to the relay driving module 2, and the relay driving module 2 is connected to the magnetic latching relay 3 through signal lines QA and QB;

[0009] The power supply module 5 provides the working power supply for the electric energy meter and is connected to the power input ends of each module;

[0010] The display module 6 is connected to the main control chip SoC1.

[0011] Furthermore, the magnetic latching relay 3 includes a first elastic piece 8, a second elastic piece 9 and a silver alloy contact 7;

[0012] The first elastic piece 8 and the second elastic piece 9 are connected by a slide rail 14;

[0013] The silver alloy contact 7 is located between the second elastic piece 9 and the live wire 11;

[0014] A permanent magnet 12 is fixed on the first elastic piece 8 to form a lever. When the coil 13 is energized, a magnetic field is generated to attract the first elastic piece 8. The slide rail 14 does not apply a pulling force to the second elastic piece 9. The second elastic piece 9 returns to its original shape under the action of elastic force, and the silver alloy contacts 7 come into contact, and the live wire 11 is connected; when the coil 13 is de-energized, the magnetic field disappears, and the first elastic piece 8 drives the slide rail 14 under the action of spring force, and then drives the second elastic piece 9, and the silver alloy contacts 7 are disconnected, and the live wire 11 is disconnected.

[0015] Furthermore, the load specification of the silver alloy contact 7 is 90A 250VAC.

[0016] Furthermore, the specification size of the magnetic latching relay 3 is 3.6*3*1.7 cm 3 .

[0017] Furthermore, the maximum load current of the magnetic latching relay 3 is 90A.

[0018] The beneficial effects of the present utility model are as follows: The electric energy meter using the magnetic latching relay of the present utility model has the function of accurately measuring under high load, accurately measuring the consumed electric energy when the business volume of the enterprise is full, safeguarding the interests of the enterprise while protecting the interests of the power plant. On the other hand, it also solves the problem that when the user increases the electrical equipment, the maximum load current will exceed the rated load of the electric energy meter, and can avoid the waste of time, space and cost caused by replacing other specifications of electric energy meters. The application of the high-load magnetic latching relay increases the safety guarantee for users and more comprehensively meets the market demand.

[0019] Other advantages, objectives and features of the present utility model will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be learned from the practice of the present utility model. The objectives and other advantages of the present utility model can be realized and obtained through the following specification. Brief Description of the Drawings

[0020] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail and preferably below in conjunction with the accompanying drawings, where:

[0021] Figure 1 is the relay control circuit diagram;

[0022] Figure 2 is the relay structure diagram.

[0023] Reference numerals: main control chip SoC1, relay drive circuit 2, magnetic latching relay 3, current sampling circuit 4, power supply module 5, display module 6, silver alloy contact 7, first elastic piece 8, second elastic piece 9, neutral wire 10, live wire 11, permanent magnet 12, coil 13, slide rail 14. Specific embodiments

[0024] The following uses specific specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present utility model in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0025] Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical diagrams, and should not be construed as a limitation to the present utility model; in order to better illustrate the embodiments of the present utility model, some components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0026] In the accompanying drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation to the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] The technical solution adopted by the present utility model is a magnetic latching relay capable of adapting to high-load scenarios, ensuring that the micro-miniature watt-hour meter used in conjunction with it still has stable on-off capabilities in high-load scenarios. The characteristics of this relay are as follows: it can maintain stable on-off capabilities under a current load of 90A.

[0028] Figure 1 The figure shows the structure diagram of the magnetic latching relay disclosed in the present utility model. The relay driver is connected to the main control chip SoC of the watt-hour meter through the I2C communication protocol, receiving on-off signals for controlling the magnetic latching relay. The relay driver is connected to the relay through QA and QB. By controlling the on-off of the current, the first elastic piece inside the relay is controlled, thereby causing the second elastic piece to disconnect (close), and further controlling the disconnection (conduction) of the live wire, realizing the structure of small current controlling large current. Among them, the contacts in the relay are made of silver alloy material, with a load specification of 90A 250VAC, and can maintain stable on-off capabilities within a load current of 90A. The left side of this relay is connected to the power grid, and the other side is connected to the current sampling circuit of the watt-hour meter. When the voltage fluctuates, the sampling circuit can play a voltage stabilizing role. When the load is too large, it can stably disconnect, and this relay acts as a load switch. Therefore, the watt-hour meter using the present utility model can accurately measure in high-load scenarios.

[0029] Figure 2 The figure shows the structure of a magnetic latching relay that operates at a maximum current of 90A disclosed in the present utility model. The size of this magnetic latching relay is 3.6*3*1.7cm 3 , uses a special silver alloy material, with a contact load of 90A 250VAC, a maximum disconnection time of 20ms, a maximum load current of 90A for the magnetic latching relay, and the current load of the connected single-phase rail watt-hour meter within the range of 80A. It maintains a low on-resistance, ensures stable on-off capabilities, increases the reliability of the watt-hour meter, and also reduces the volume.

[0030] The connection method between the present utility model and the watt-hour meter is as Figure 1 shown. The specific implementation method is that the relay driver is connected to the main control chip SoC through I2C to control the on-off of the relay. The relay driver is connected to the relay through QA and QB. By controlling the on-off of the current, the first elastic piece inside the relay is controlled, thereby causing the second elastic piece to disconnect (close), and further controlling the disconnection (conduction) of the live wire. Since the silver alloy contacts of the relay can withstand a current load of 90A, it can ensure stable on-off within a current range of 90A. The SoC used in conjunction with it can accurately measure a current of up to 80A at most. Therefore, this watt-hour meter can achieve a metering accuracy of 0.5S level within a dynamic range of one ten-thousandth under large-load conditions.

[0031] A micro-miniature electric energy meter with stable on-off ability in high-load working scenarios, comprising a main control chip SoC1, a relay driving module 2, a magnetic latching relay 3, a signal acquisition module 4, a power supply module 5, and a display module 6;

[0032] The signal acquisition module 4 is connected to the live wire of the magnetic latching relay 3 and is used to collect current signals; the neutral wire 10 is used for the return current in the circuit and forms a closed loop of current together with the live wire 11.

[0033] The main control chip SoC1 is connected to the relay driving module 2, and the relay driving module 2 is connected to the magnetic latching relay 3 through signal lines QA and QB;

[0034] The power supply module 5 provides working power for the electric energy meter and is connected to the power input ends of each module;

[0035] The display module 6 is connected to the main control chip SoC1.

[0036] Furthermore, the magnetic latching relay 3 includes a first elastic sheet 8, a second elastic sheet 9, and a silver alloy contact 7;

[0037] The first elastic sheet 8 and the second elastic sheet 9 are connected by a slide rail 14;

[0038] The silver alloy contact 7 is located between the second elastic sheet 9 and the live wire 11;

[0039] A permanent magnet 12 is fixed on the first elastic sheet 8 to form a lever. When the coil 13 is energized, a magnetic field is generated, attracting the first elastic sheet 8. The slide rail 14 does not exert a pulling force on the second elastic sheet 9, and the second elastic sheet 9 returns to its original shape under the action of elastic force, and the silver alloy contacts 7 come into contact, and the live wire 11 is connected; when the coil 13 is de-energized, the magnetic field disappears, and the first elastic sheet 8 drives the slide rail 14 under the action of spring force, and then drives the second elastic sheet 9, and the silver alloy contacts 7 are disconnected, and the live wire 11 is disconnected.

[0040] The load specification of the silver alloy contact is 90A 250VAC.

[0041] The specification size of the magnetic latching relay is 3.6*3*1.7 cm 3 。

[0042] The maximum load current of the magnetic latching relay is 90A.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A miniature electric energy meter with stable switching capability under heavy load working scenarios, characterized by: It comprises a main control chip SoC (1), a relay drive module (2), a magnetic latching relay (3), a signal acquisition module (4), a power module (5) and a display module (6); The signal acquisition module (4) is connected to the live wire of the magnetic latching relay (3) and is used to collect current signals; The main control chip SoC (1) is connected to the relay drive module (2), and the relay drive module (2) is connected to the magnetic latching relay (3) via QA and QB signal lines; The power supply module (5) provides working power for the electric energy meter and is connected to the power input terminal of each module; The display module (6) is connected to the main control chip SoC (1).

2. According to claim 1, a miniature electric energy meter with stable switching capability under heavy load working scenarios is characterized by: The magnetic holding relay (3) comprises a first spring sheet (8), a second spring sheet (9) and a silver alloy contact (7); The first elastic sheet (8) and the second elastic sheet (9) are connected via a slide rail (14); The silver alloy contact (7) is located between the second spring piece (9) and the live wire (11); A permanent magnet (12) is fixed on the first spring sheet (8) to form a lever. When the coil (13) is energized, a magnetic field is generated to attract the first spring sheet (8). The slide rail (14) does not apply a pulling force to the second spring sheet (9). The second spring sheet (9) restores its original shape under the action of the elastic force, the silver alloy contacts (7) are in contact, and the live wire (11) is connected. When the coil (13) is de-energized, the magnetic field disappears. The first spring sheet (8) drives the slide rail (14) under the action of the spring force, and then drives the second spring sheet (9). The silver alloy contacts (7) are disconnected, and the live wire (11) is disconnected.

3. According to claim 2, a miniature electric energy meter with stable switching capability under heavy load working scenarios is characterized in that: The load specification of the silver alloy contact (7) is 90A250VAC.

4. According to claim 1, a miniature electric energy meter with stable switching capability under heavy load working scenarios is characterized in that: The size of the magnetic latching relay (3) is 3.6*3*1.7 cm. 3 .

5. According to claim 1, a miniature electric energy meter with stable switching capability under heavy load working scenarios is characterized in that: The maximum load current of the magnetic latching relay (3) is 90A.

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