A single-phase metering and three-phase metering compatible circuit and electric energy meter

Abstract

The utility model discloses a single -phase measurement and three -phase measurement compatible circuit and electric energy meter, and the compatible circuit includes: first measurement chip, second measurement chip and main control chip, and the first end of main control chip receives power signal, and the second end of main control chip is connected first measurement chip, and the third input of main control chip is connected second measurement chip, and first measurement chip measurement B phase data obtains B phase result, and second measurement chip measurement C phase data obtains C phase result, and main control chip measurement A phase data obtains A phase result, and obtains three -phase electric energy result according to A phase result, B phase result and C phase result. Through a compatible circuit realizes two kinds of measurement to single -phase and three -phase, makes single -phase and three -phase main control chip and measurement chip consistent, and has reduced the cost from purchase, program writing to maintenance and so on each aspect.

Description

Technical Field

[0001] This utility model relates to the field of electricity meters, and in particular to a single-phase metering and three-phase metering compatible circuit and electricity meter. Background Technology

[0002] In the field of electricity metering, accurate and reliable measurement of electrical energy is crucial to ensuring fair and equitable electricity trading and the stable operation of the power system. Currently, there are two main types of electricity meters in the power system: single-phase electricity meters and three-phase electricity meters, each suitable for different electricity consumption scenarios.

[0003] However, the main control chips and metering chips used in single-phase and three-phase electricity meters are generally different: single-phase electricity meters use a single-phase microcontroller chip and a single-phase metering chip, or a single-phase main control chip that integrates control and metering functions, to perform the functions of a single-phase electricity meter; while three-phase electricity meters use a three-phase main control chip and a three-phase metering chip to perform the functions of a three-phase electricity meter. Therefore, the different main control chips and metering chips used in single-phase and three-phase electricity meters necessitate two different solutions in procurement, programming, and subsequent maintenance, increasing costs. Summary of the Invention

[0004] This utility model provides a single-phase metering and three-phase metering compatible circuit and energy meter to solve the problem of high cost caused by the different main control chips and metering chips used in existing single-phase and three-phase energy meters.

[0005] To achieve the above objectives, in one embodiment, a single-phase metering and three-phase metering compatible circuit is provided, the compatible circuit comprising:

[0006] The system comprises a first metering chip, a second metering chip, and a main control chip. The first terminal of the main control chip is used to receive power signals, the second terminal of the main control chip is connected to the first metering chip, and the third terminal of the main control chip is connected to the second metering chip.

[0007] The first metering chip is used to transmit the B-phase result to the main control chip, the second metering chip is used to transmit the C-phase result to the main control chip, and the main control chip is used to obtain the A-phase result and obtain the three-phase power result based on the A-phase result, the B-phase result and the C-phase result.

[0008] The aforementioned single-phase and three-phase metering compatible circuit first measures the A-phase data using a main control chip to obtain the A-phase result. Then, it determines whether the phase is single-phase or three-phase. If it's single-phase, metering is completed; if it's three-phase, the first metering chip measures the B-phase data to obtain the B-phase result, and the second metering chip measures the C-phase data to obtain the C-phase result. Finally, based on the A-phase, B-phase, and C-phase results, the three-phase energy result is calculated. This compatible circuit enables both single-phase and three-phase metering, ensuring consistency between the main control chip and metering chip for both phases, reducing costs associated with procurement, programming, and maintenance.

[0009] In one embodiment, the compatible circuit further includes:

[0010] The system comprises a phase A acquisition circuit, a phase B acquisition circuit, and a phase C acquisition circuit. The phase A acquisition circuit is connected to the main control chip, the phase B acquisition circuit is connected to the first metering chip, and the phase C acquisition circuit is connected to the second metering chip.

[0011] In one embodiment, a single-phase metering and three-phase metering compatible circuit is provided, the compatible circuit comprising:

[0012] The system comprises a first metering chip, a second metering chip, a main control chip, and a serial port selection circuit. The first terminal of the main control chip is used to receive power signals, the second terminal of the main control chip is connected to the first input terminal of the serial port selection circuit, and the third terminal of the main control chip is connected to the first output terminal of the serial port selection circuit.

[0013] The second input terminal of the serial port selection circuit is connected to the output terminal of the first metering chip, the second output terminal of the serial port selection circuit is connected to the first input terminal of the first metering chip, the third input terminal of the serial port selection circuit is connected to the output terminal of the second metering chip, and the third output terminal of the serial port selection circuit is connected to the first input terminal of the second metering chip.

[0014] The first metering chip is used to transmit the B-phase result to the main control chip, the second metering chip is used to transmit the C-phase result to the main control chip, and the main control chip is used to obtain the A-phase result and obtain the three-phase power result based on the A-phase result, the B-phase result and the C-phase result.

[0015] The aforementioned single-phase and three-phase metering compatible circuit first measures the A-phase data using a main control chip to obtain the A-phase result. Then, it determines whether the result is single-phase or three-phase. If it's single-phase, metering is completed. If it's three-phase, the main control chip first controls the serial port selection circuit, connecting it to the first metering chip to measure the B-phase data. After obtaining the B-phase result, the main control chip then controls the serial port selection circuit again, connecting it to the second metering chip to measure the C-phase data. Based on the A-phase, B-phase, and C-phase results, the three-phase energy result is calculated. This compatible circuit enables both single-phase and three-phase metering, ensuring consistency between the main control chip and metering chip for both types of metering, reducing costs associated with procurement, programming, and maintenance.

[0016] In one embodiment, the serial port selection circuit includes:

[0017] A first switch and a second switch, wherein one end of the first switch is connected to the second terminal of the main control chip, and the other end of the first switch is connected to the first input terminal of the first metering chip; one end of the second switch is connected to the third terminal of the main control chip, and the other end of the second switch is connected to the output terminal of the first metering chip;

[0018] The third switch and the fourth switch are connected as follows: one end of the third switch is connected to the second terminal of the main control chip, and the other end of the third switch is connected to the first input terminal of the second metering chip; one end of the fourth switch is connected to the third terminal of the main control chip, and the other end of the fourth switch is connected to the output terminal of the second metering chip.

[0019] In one embodiment, the serial port selection circuit includes:

[0020] A first single-pole double-throw switch and a second single-pole double-throw switch, wherein the first end of the first single-pole double-throw switch is connected to the second end of the main control chip, the second end of the first single-pole double-throw switch is connected to the first input end of the first metering chip, and the third end of the first single-pole double-throw switch is connected to the output end of the first metering chip;

[0021] The first terminal of the second single-pole double-throw switch is connected to the third terminal of the main control chip, the second terminal of the second single-pole double-throw switch is connected to the first input terminal of the second metering chip, and the third terminal of the second single-pole double-throw switch is connected to the output terminal of the second metering chip.

[0022] In one embodiment, the compatible circuit further includes:

[0023] The system comprises a phase A acquisition circuit, a phase B acquisition circuit, and a phase C acquisition circuit. The phase A acquisition circuit is connected to the main control chip, the phase B acquisition circuit is connected to the first metering chip, and the phase C acquisition circuit is connected to the second metering chip.

[0024] In one embodiment, a single-phase and three-phase compatible energy meter is provided, wherein the compatible energy meter is provided with the above-mentioned single-phase and three-phase compatible circuit.

[0025] The aforementioned single-phase and three-phase compatible energy meter first measures the A-phase data using a main control chip to obtain the A-phase result. Then, it determines whether the meter is a single-phase or three-phase meter. If it is a single-phase meter, the measurement is completed. If it is a three-phase meter, it controls the first metering chip (or communicates with it via a serial port selection circuit) to measure the B-phase data to obtain the B-phase result. Then, it controls the second metering chip (or communicates with it via a serial port selection circuit) to measure the C-phase data to obtain the C-phase result. Finally, based on the A-phase, B-phase, and C-phase results, the energy output for the three-phase meter is calculated. This achieves compatibility with both single-phase and three-phase energy meters, ensuring that the main control and metering chips are consistent for both single-phase and three-phase meters, reducing costs associated with procurement, programming, and maintenance.

[0026] In one embodiment, the energy meter further includes a power supply connected to a first terminal of the main control chip for supplying power to the main control chip.

[0027] In one embodiment, the energy meter further includes a memory connected to the main control chip for storing the energy output of the main control chip.

[0028] In one embodiment, the electricity meter further includes a communication chip, which is connected to the main control chip and is used to upload the electricity results to the power grid system. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a single-phase metering and three-phase metering compatible circuit according to one embodiment of the present invention;

[0031] Figure 2This is a schematic diagram of another single-phase metering and three-phase metering compatible circuit in one embodiment of this utility model;

[0032] Figure 3 This is a circuit diagram of a serial port selection circuit consisting of four switches in one embodiment of this utility model;

[0033] Figure 4 This is a circuit diagram of a serial port selection circuit consisting of two single-pole double-throw switches in one embodiment of this utility model.

[0034] Reference numerals in the attached diagram: 1. First metering chip; 3. Second metering chip; 5. Main control chip; 6. Phase A acquisition circuit; 7. Phase B acquisition circuit; 8. Phase C acquisition circuit; 9. Serial port selection circuit; 901. First switch; 902. Second switch; 903. Third switch; 904. Fourth switch; 905. First single-pole double-throw switch; 906. Second single-pole double-throw switch. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0036] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art. In the drawings, for clarity, the dimensions of layers and regions, as well as their relative dimensions, may be exaggerated. The same reference numerals denote the same elements throughout.

[0037] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this utility model, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0038] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below,” “under,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0039] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0040] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0041] In one embodiment, such as Figure 1 As shown, a single-phase metering and three-phase metering compatible circuit is provided, the compatible circuit comprising:

[0042] The system comprises a first metering chip 1, a second metering chip 3, and a main control chip 5. The first terminal L1 of the main control chip 5 is used to receive power signals, the second terminal L2 of the main control chip 5 is connected to the first metering chip 1, and the third terminal L3 of the main control chip 5 is connected to the second metering chip 3.

[0043] The first metering chip 1 is used to transmit the B-phase result to the main control chip 1, the second metering chip 3 is used to transmit the C-phase result to the main control chip 1, and the main control chip 5 is used to obtain the A-phase result and obtain the three-phase power result based on the A-phase result, the B-phase result and the C-phase result.

[0044] Specifically, the main control chip 5 acquires the voltage and current of phase A, multiplies and integrates the instantaneous values ​​of the phase A voltage and current to calculate the active power of phase A; calculates the reactive power of phase A based on the phase difference between the phase A voltage and current; multiplies the effective values ​​of the phase A voltage and current to obtain the apparent power of phase A; and integrates the active power of phase A to obtain the electrical energy consumed by phase A.

[0045] Then, the main control chip 5 determines whether it is single-phase or three-phase that needs to be measured based on the detected power signal input. If there is only one set of voltage and current signal input, it is single-phase measurement, and the measurement has been completed. The electrical energy consumed by phase A is the result of phase A, which is the result of single-phase electrical energy.

[0046] If there are three or four sets of voltage and current signal inputs, it is three-phase metering. Then, the main control chip 5 first controls the first metering chip 1 to obtain the voltage and current of phase B. The calculation process is the same as that of phase A, and the active power, reactive power, apparent power and energy consumed by phase B are obtained. The energy consumed by phase B is the phase B result. Then the phase B result is transmitted to the main control chip 5.

[0047] The main control chip 5 then controls the second metering chip 3 to obtain the voltage and current of phase C. The calculation process is the same as that of phase A, and the active power, reactive power, apparent power and energy consumed by phase C are obtained. The energy consumed by phase C is the phase C result. Then the phase C result is transmitted to the main control chip 5.

[0048] The main control chip 5 adds the active power values ​​of phases A, B, and C based on the results of phase A, phase B, and phase C to obtain the total three-phase power. It then multiplies the total power by time to obtain the three-phase electrical energy. Finally, it converts the units of the three-phase electrical energy to obtain the final three-phase electrical energy result.

[0049] The process of obtaining single-phase and three-phase electrical energy results is existing technology.

[0050] The above-mentioned main control chip determines whether the current measurement needs to be single-phase or three-phase as an example. Other determination methods can also be used, all of which are within the protection scope of this application.

[0051] The main control chip can be one of MG33M0610ER, MG33M068ER or MG33M066ER. The first metering chip and the second metering chip are both V9240. The model can be adjusted as needed, and all are within the protection scope of this application.

[0052] In this embodiment, the main control chip first measures the data for phase A to obtain the phase A result. Then, it determines whether it is single-phase or three-phase. If it is single-phase, the measurement is completed. If it is three-phase, the first metering chip measures the data for phase B to obtain the phase B result, and the second metering chip measures the data for phase C to obtain the phase C result. Finally, based on the phase A, phase B, and phase C results, the three-phase energy result is calculated. A compatible circuit enables both single-phase and three-phase metering, ensuring that the main control chip and metering chip are consistent for both single-phase and three-phase applications, reducing costs associated with procurement, programming, and maintenance.

[0053] In one embodiment, such as Figure 1 As shown, the compatibility circuit further includes:

[0054] Phase A acquisition circuit 6, Phase B acquisition circuit 7, and Phase C acquisition circuit 8 are connected. Phase A acquisition circuit 6 is connected to the main control chip 5, Phase B acquisition circuit 7 is connected to the first metering chip 1, and Phase C acquisition circuit 8 is connected to the second metering chip 3.

[0055] Among them, phase A acquisition circuit 6 is used to acquire the current and voltage data of phase A, phase B acquisition circuit 7 is used to acquire the current and voltage data of phase B, and phase C acquisition circuit 8 is used to acquire the current and voltage data of phase C.

[0056] In the A-phase, B-phase, and C-phase acquisition circuits, current transformers are used to sample the current, and voltage transformers are used to sample the voltage. The analog signals of current and voltage are converted into digital signals through an analog-to-digital converter module. Then, the current and voltage of phase A are transmitted to the main control chip 5, the current and voltage of phase B are transmitted to the first metering chip 1, and the current and voltage of phase C are transmitted to the second metering chip 3.

[0057] In this embodiment, phase A, phase B, and phase C acquisition circuits are used to acquire the voltage and current of phases A, B, and C, respectively. Phase A data is directly stored on the main control chip without further transmission. Phase B and C data are transmitted to the main control chip via serial port. The main control chip then acquires the voltage and current of phase A for measurement, obtaining the phase A result. It then determines whether it is single-phase or three-phase. If single-phase, the measurement is completed. If three-phase, the first metering chip is controlled to acquire the voltage and current of phase B for measurement, obtaining the phase A result. Similarly, the second metering chip is controlled to acquire the voltage and current of phase C for measurement, obtaining the phase A result. Finally, based on the phase A, B, and C results, the three-phase energy is calculated. A compatible circuit enables both single-phase and three-phase metering, ensuring consistency between the main control chip and metering chip for both single-phase and three-phase applications, reducing costs associated with procurement, programming, and maintenance.

[0058] In one embodiment, such as Figure 2 As shown, a single-phase metering and three-phase metering compatible circuit is provided, the compatible circuit comprising:

[0059] The system comprises a first metering chip 1, a second metering chip 3, a main control chip 5, and a serial port selection circuit 9. The first terminal L1 of the main control chip 5 is used to receive power signals, the second terminal L2 of the main control chip 5 is connected to the first input terminal D1 of the serial port selection circuit 9, and the third terminal L2 of the main control chip 5 is connected to the first output terminal D2 of the serial port selection circuit 9.

[0060] The second input terminal D3 of the serial port selection circuit 9 is connected to the output terminal E1 of the first metering chip 1, the second output terminal D4 of the serial port selection circuit 9 is connected to the first input terminal E2 of the first metering chip 1, the third input terminal D5 of the serial port selection circuit 9 is connected to the output terminal Q1 of the second metering chip 3, and the third output terminal D6 of the serial port selection circuit 9 is connected to the first input terminal Q2 of the second metering chip 3.

[0061] The first metering chip 1 is used to transmit the B-phase result to the main control chip 1, the second metering chip 3 is used to transmit the C-phase result to the main control chip 1, and the main control chip 5 is used to obtain the A-phase result and obtain the electrical energy result based on the A-phase result, the B-phase result and the C-phase result.

[0062] Specifically, the main control chip 5 acquires the voltage and current of phase A, multiplies and integrates the instantaneous values ​​of the phase A voltage and current to calculate the active power of phase A; calculates the reactive power of phase A based on the phase difference between the phase A voltage and current; multiplies the effective values ​​of the phase A voltage and current to obtain the apparent power of phase A; and integrates the active power of phase A to obtain the electrical energy consumed by phase A.

[0063] Then, the main control chip 5 determines whether it is single-phase or three-phase that needs to be measured based on the detected power signal input. If there is only one set of voltage and current signal input, it is single-phase measurement, and the measurement has been completed. The electrical energy consumed by phase A is the result of phase A, which is the result of single-phase electrical energy.

[0064] If there are three or four sets of voltage and current signal inputs, it is three-phase metering. In this case, the main control chip 5 first controls the serial port selection circuit 9 to make the serial port path between the serial port selection circuit 9 and the first metering chip 1 open. The main control chip 5 communicates with the first metering chip 1 and controls the first metering chip 1 to obtain the voltage and current of phase B. The calculation process is the same as that of phase A, and the active power, reactive power, apparent power and energy consumed by phase B are obtained. The energy consumed by phase B is the phase B result. Then the phase B result is transmitted to the main control chip 5.

[0065] Then, the main control chip 5 controls the serial port selection circuit 9, enabling the serial port path between the serial port selection circuit 9 and the second metering chip 3 to be connected. The main control chip 5 communicates with the second metering chip 3, controlling the second metering chip 3 to obtain the voltage and current of phase C. The calculation process is the same as that of phase A, obtaining the active power, reactive power, apparent power, and energy consumed by phase C. The energy consumed by phase C is the phase C result. Then, the phase C result is transmitted to the main control chip 5.

[0066] The main control chip 5 adds the active power values ​​of phases A, B, and C based on the results of phase A, phase B, and phase C to obtain the total three-phase power. It then multiplies the total power by time to obtain the three-phase electrical energy. Finally, it converts the units of the three-phase electrical energy to obtain the final three-phase electrical energy result.

[0067] The process of obtaining single-phase and three-phase electrical energy results is existing technology and will not be described in detail hereafter.

[0068] The above-mentioned main control chip determines whether the current measurement needs to be single-phase or three-phase as a specific example. Other determination methods can also be used, all of which are within the protection scope of this application.

[0069] The main control chip can be one of MG33M0610ER, MG33M068ER or MG33M066ER. The first metering chip and the second metering chip are both V9240. The model can be adjusted as needed, and all are within the protection scope of this application.

[0070] In this embodiment, the main control chip first measures the data for phase A to obtain the phase A result. Then, it determines whether it is single-phase or three-phase. If it is single-phase, the measurement is completed. If it is three-phase, the main control chip first controls the serial port selection circuit to connect with the first metering chip, controlling the first metering chip to measure the data for phase B. After obtaining the phase B result, the main control chip then controls the serial port selection circuit to connect with the second metering chip, controlling the second metering chip to measure the data for phase C to obtain the phase C result. Finally, based on the phase A, phase B, and phase C results, the three-phase energy result is calculated. A compatible circuit enables both single-phase and three-phase metering, ensuring consistency between the main control chip and metering chip for both phases, reducing costs associated with procurement, programming, and maintenance.

[0071] In one embodiment, such as Figure 3 As shown, the serial port selection circuit 9 includes:

[0072] A first switch 901 and a second switch 902 are connected. One end of the first switch 901 is connected to the second terminal L2 of the main control chip 5, and the other end of the first switch 901 is connected to the first input terminal E2 of the first metering chip 1. One end of the second switch 902 is connected to the third terminal L3 of the main control chip 5, and the other end of the second switch 902 is connected to the output terminal E1 of the first metering chip 1.

[0073] The third switch 903 and the fourth switch 904 are connected as follows: one end of the third switch 903 is connected to the second terminal L2 of the main control chip 5, and the other end of the third switch 903 is connected to the first input terminal Q2 of the second metering chip 3; one end of the fourth switch 904 is connected to the third terminal L3 of the main control chip 5, and the other end of the fourth switch 904 is connected to the output terminal Q1 of the second metering chip 3.

[0074] When the main control chip 5 obtains the result of phase A, it determines whether it is a single phase or a three-phase phase that needs to be measured based on the detected power signal input. If there is only one set of voltage and current signal input, it is a single-phase measurement, and the measurement is completed. The electrical energy consumed by phase A is the result of phase A, which is the result of single-phase electrical energy.

[0075] If there are three or four sets of voltage and current signal inputs, it is three-phase metering. In this case, the main control chip 5 first controls the first switch 901 and the second switch 902 to close, and controls the third switch 903 and the fourth switch 904 to open, so that the serial port line between the serial port selection circuit 9 and the first metering chip 1 is connected. The main control chip 5 communicates with the first metering chip 1 and controls the first metering chip 1 to obtain the voltage and current of phase B and obtain the phase B result. Then, the phase B result is transmitted to the main control chip 5.

[0076] Then, the main control chip 5 controls the third switch 903 and the fourth switch 904 to close, and controls the first switch 901 and the second switch 902 to open, so that the serial port line between the serial port selection circuit 9 and the second metering chip 3 is connected, the main control chip 5 communicates with the second metering chip 3, and controls the second metering chip 3 to obtain the voltage and current of phase C, and obtain the phase C result; then the phase C result is transmitted to the main control chip 5.

[0077] The main control chip 5 obtains the three-phase power results based on the results of phase A, phase B, and phase C.

[0078] In this embodiment, when it is single-phase metering, the main control chip measures the single-phase result. When it is three-phase metering, the main control chip controls the first and second switches to close, and the third and fourth switches to open, communicating with the first metering chip to obtain the B-phase result. Then, the main control chip controls the third and fourth switches to close, and the first and second switches to open, communicating with the second metering chip to obtain the C-phase result. Based on the A-phase, B-phase, and C-phase results, the three-phase energy result is obtained. A compatible circuit enables both single-phase and three-phase metering, ensuring consistency between the main control chip and metering chip for both single-phase and three-phase metering, reducing costs from procurement and programming to maintenance.

[0079] In one embodiment, such as Figure 4 As shown, the serial port selection circuit 9 includes:

[0080] A first single-pole double-throw switch 905 and a second single-pole double-throw switch 906 are connected. The first end of the first single-pole double-throw switch 905 is connected to the second end L2 of the main control chip 5. The second end of the first single-pole double-throw switch 905 is connected to the first input end E2 of the first metering chip 1. The third end of the first single-pole double-throw switch 905 is connected to the first input end Q2 of the second metering chip 3.

[0081] The first end of the second single-pole double-throw switch 906 is connected to the third end L3 of the main control chip 5, the second end of the second single-pole double-throw switch 906 is connected to the output end E1 of the first metering chip 1, and the third end of the second single-pole double-throw switch 906 is connected to the output end Q1 of the second metering chip 3.

[0082] When the main control chip 5 obtains the result of phase A, it determines whether it is a single phase or a three-phase phase that needs to be measured based on the detected power signal input. If there is only one set of voltage and current signal input, it is a single-phase measurement, and the measurement is completed. The electrical energy consumed by phase A is the result of phase A, which is the result of single-phase electrical energy.

[0083] If there are three or four sets of voltage and current signal inputs, it is three-phase metering. In this case, the main control chip 5 first controls the second terminal of the first single-pole double-throw switch 905 to close and the third terminal to open, and controls the second terminal of the second single-pole double-throw switch 906 to close and the third terminal to open, so that the serial port line between the serial port selection circuit 9 and the first metering chip 1 is connected. The main control chip 5 communicates with the first metering chip 1 and controls the first metering chip 1 to obtain the voltage and current of phase B and obtain the phase B result; then the phase B result is transmitted to the main control chip 5.

[0084] Then, the main control chip 5 controls the third terminal of the first single-pole double-throw switch 905 to close and the second terminal to open, and controls the second terminal of the second single-pole double-throw switch 906 to open and the third terminal to close, so that the serial port line between the serial port selection circuit 9 and the second metering chip 3 is connected, and the main control chip 5 communicates with the second metering chip 3 to control the second metering chip 3 to obtain the voltage and current of phase C and obtain the phase C result; then the phase C result is transmitted to the main control chip 5.

[0085] The main control chip 5 obtains the three-phase power results based on the results of phase A, phase B, and phase C.

[0086] In this embodiment, the main control chip first measures the data for phase A to obtain the phase A result. Then, it determines whether it is single-phase or three-phase. If it is single-phase, the measurement is completed. If it is three-phase, the main control chip first controls the second terminal of the first single-pole double-throw switch to close and the third terminal to open, and then controls the second terminal of the second single-pole double-throw switch to close and the third terminal to open, thus connecting the serial port selection circuit with the first metering chip. The first metering chip then measures the data for phase B to obtain the phase B result. After obtaining the phase B result, the main control chip then controls the second terminal of the first single-pole double-throw switch to open and the third terminal to close, and controls the third terminal of the second single-pole double-throw switch to close and the second terminal to open, thus connecting the serial port selection circuit with the second metering chip. The second metering chip then measures the data for phase C to obtain the phase C result. Finally, based on the phase A, phase B, and phase C results, the three-phase energy result is calculated. A compatible circuit enables both single-phase and three-phase metering, ensuring that the main control chip and metering chip are consistent for both single-phase and three-phase applications, reducing costs in procurement, programming, and maintenance.

[0087] In one embodiment, such as Figure 3 or Figure 4 As shown, the compatibility circuit further includes:

[0088] Phase A acquisition circuit 6, Phase B acquisition circuit 7, and Phase C acquisition circuit 8 are connected. Phase A acquisition circuit 6 is connected to the main control chip 5, Phase B acquisition circuit 7 is connected to the first metering chip 1, and Phase C acquisition circuit 8 is connected to the second metering chip 3.

[0089] Among them, phase A acquisition circuit 6 is used to acquire the current and voltage data of phase A, phase B acquisition circuit 7 is used to acquire the current and voltage data of phase B, and phase C acquisition circuit 8 is used to acquire the current and voltage data of phase C.

[0090] In the A-phase, B-phase, and C-phase acquisition circuits, current transformers are used to sample the current, and voltage transformers are used to sample the voltage. The analog signals of current and voltage are converted into digital signals through an analog-to-digital converter module. Then, the current and voltage of phase A are transmitted to the main control chip 5, the current and voltage of phase B are transmitted to the first metering chip 1, and the current and voltage of phase C are transmitted to the second metering chip 3.

[0091] In this embodiment, the voltage and current of phases A, B, and C are acquired and transmitted through phase A acquisition circuits, respectively. The main control chip acquires the voltage and current of phase A for measurement, obtaining the phase A result. It then determines whether it is single-phase or three-phase. If it is single-phase, the measurement is completed. If it is three-phase, the first metering chip acquires the voltage and current of phase B for measurement, obtaining the phase A result. Similarly, the second metering chip acquires the voltage and current of phase C for measurement, obtaining the phase A result. Finally, based on the phase A, B, and C results, the three-phase electrical energy is calculated. A compatible circuit enables both single-phase and three-phase metering, ensuring consistency between the main control chip and metering chip for both single-phase and three-phase applications, reducing costs associated with procurement, programming, and maintenance.

[0092] In one embodiment, a single-phase and three-phase compatible energy meter is provided, wherein the compatible energy meter is provided with the above-mentioned single-phase and three-phase compatible circuit.

[0093] Among them, when the single-phase metering and three-phase metering compatibility circuit in the compatible energy meter is as follows: Figure 1 As shown, the main control chip 5 acquires the voltage and current of phase A, multiplies and integrates the instantaneous values ​​of the phase A voltage and current to calculate the active power of phase A; calculates the reactive power of phase A based on the phase difference between the phase A voltage and current; multiplies the effective values ​​of the phase A voltage and current to obtain the apparent power of phase A; and integrates the active power of phase A to obtain the electrical energy consumed by phase A.

[0094] Then, the main control chip 5 determines whether it is a single-phase energy meter or a three-phase energy meter based on the detected power signal input. If there is only one set of voltage and current signal input, it is a single-phase energy meter, and the metering has been completed. The electrical energy consumed by phase A is the result of phase A, which is the electrical energy result of a single-phase energy meter.

[0095] If there are three or four sets of voltage and current signal inputs, it is a three-phase energy meter. Then, the main control chip 5 first controls the first metering chip 1 to obtain the voltage and current of phase B. The calculation process is the same as that of phase A, and the active power, reactive power, apparent power and energy consumed by phase B are obtained. The energy consumed by phase B is the phase B result. Then the phase B result is transmitted to the main control chip 5.

[0096] Then, the main control chip 5 controls the second metering chip 3 to obtain the voltage and current of phase C. The calculation process is the same as that of phase A, and the active power, reactive power, apparent power and energy consumed by phase C are obtained. The energy consumed by phase C is the phase C result. Then the phase C result is transmitted to the main control chip 5.

[0097] The main control chip 5 adds the active power values ​​of phases A, B, and C based on the results of phase A, phase B, and phase C to obtain the total three-phase power. It then multiplies the total power by time to obtain the three-phase electrical energy. Finally, it converts the units of the three-phase electrical energy to obtain the electrical energy result of the three-phase energy meter.

[0098] When the single-phase metering and three-phase metering compatible circuits in the compatible energy meter are as follows: Figure 2 As shown, the main control chip 5 acquires the voltage and current of phase A, multiplies and integrates the instantaneous values ​​of the phase A voltage and current to calculate the active power of phase A; calculates the reactive power of phase A based on the phase difference between the phase A voltage and current; multiplies the effective values ​​of the phase A voltage and current to obtain the apparent power of phase A; and integrates the active power of phase A to obtain the electrical energy consumed by phase A.

[0099] Then, the main control chip 5 determines whether it is a single-phase energy meter or a three-phase energy meter based on the detected power signal input. If there is only one set of voltage and current signal input, it is a single-phase energy meter, and the metering has been completed. The electrical energy consumed by phase A is the result of phase A, which is the electrical energy result of a single-phase energy meter.

[0100] If there are three or four sets of voltage and current signal inputs, it is a three-phase energy meter. In this case, the main control chip 5 first controls the serial port selection circuit 9 to make the serial port path between the serial port selection circuit 9 and the first metering chip 1 open. The main control chip 5 communicates with the first metering chip 1 and controls the first metering chip 1 to obtain the voltage and current of phase B. The calculation process is the same as that of phase A, and the active power, reactive power, apparent power and energy consumed by phase B are obtained. The energy consumed by phase B is the phase B result. Then the phase B result is transmitted to the main control chip 5.

[0101] Then, the main control chip 5 controls the serial port selection circuit 9, enabling the serial port path between the serial port selection circuit 9 and the second metering chip 3 to be connected. The main control chip 5 communicates with the second metering chip 3, controlling the second metering chip 3 to obtain the voltage and current of phase C. The calculation process is the same as that of phase A, obtaining the active power, reactive power, apparent power, and energy consumed by phase C. The energy consumed by phase C is the phase C result. Then, the phase C result is transmitted to the main control chip 5.

[0102] The main control chip 5 adds the active power values ​​of phases A, B, and C based on the results of phase A, phase B, and phase C to obtain the total three-phase power. It then multiplies the total power by time to obtain the three-phase electrical energy. Finally, it converts the units of the three-phase electrical energy to obtain the electrical energy result of the three-phase energy meter.

[0103] The above-mentioned main control chip's determination of whether the current energy meter is a single-phase or three-phase energy meter is a specific example. Other determination methods can also be used, all of which are within the scope of protection of this application.

[0104] The main control chip can be one of MG33M0610ER, MG33M068ER or MG33M066ER. The first metering chip and the second metering chip are both V9240. The model can be adjusted as needed, and all are within the protection scope of this application.

[0105] In this embodiment, the main control chip first measures the data for phase A to obtain the phase A result. Then, it determines whether the meter is a single-phase or three-phase energy meter. If it is a single-phase energy meter, the measurement is completed. If it is a three-phase energy meter, the first metering chip is controlled or communicated with via a serial port selection circuit to measure the data for phase B to obtain the phase B result. The second metering chip is controlled or communicated with via a serial port selection circuit to measure the data for phase C to obtain the phase C result. Finally, based on the phase A, phase B, and phase C results, the energy result of the three-phase energy meter is calculated. This achieves compatibility with both single-phase and three-phase energy meters, ensuring that the main control chip and metering chip are consistent for both single-phase and three-phase meters, reducing costs in procurement, programming, and maintenance.

[0106] In one embodiment, the energy meter further includes a power supply connected to a first terminal of the main control chip for supplying power to the main control chip.

[0107] The power supply is connected to the power grid to obtain power for the electricity meter, or a backup power source (such as a battery) is installed in the electricity meter so that the electricity meter can maintain its basic functions when the power grid fails.

[0108] In this embodiment, the energy meter is powered by a power supply to ensure its normal operation. The main control chip first measures the data for phase A to obtain the phase A result. Then, it determines whether the energy meter is single-phase or three-phase. If it is a single-phase energy meter, the measurement is completed. If it is a three-phase energy meter, the first metering chip is controlled or communicated with via a serial port selection circuit to measure the data for phase B to obtain the phase B result. The second metering chip is controlled or communicated with via a serial port selection circuit to measure the data for phase C to obtain the phase C result. Finally, based on the phase A, phase B, and phase C results, the energy result of the three-phase energy meter is calculated. This achieves compatibility with both single-phase and three-phase energy meters, ensuring that the main control chip and metering chip are consistent for both single-phase and three-phase meters, reducing costs in procurement, programming, and maintenance.

[0109] In one embodiment, the energy meter further includes a memory connected to the main control chip for storing the energy output of the main control chip.

[0110] The memory is connected to the main control chip, and the memory is used to save the energy results of the single-phase energy meter or the energy results of the three-phase energy meter obtained by the main control chip, as well as the calibration parameters, into the memory.

[0111] In addition, the memory also stores the calibration parameters of the energy meter, which may include the energy meter wiring method, current input method, calibration method, voltage range, current range, energy constant, frequency division coefficient, number of calibration turns, current transformer ratio, etc.

[0112] In this embodiment, by storing the energy consumption results and calibration parameters of the energy meter in the memory, it is ensured that the data of the energy meter will not be lost after a power outage. At the same time, it can record historical data such as the energy consumption and fault records of the energy meter, which is convenient for users and circuit departments to query and analyze. It can also realize multiple functions such as remote meter reading, prepaid management and load control, improve the intelligence level of the energy meter, achieve compatibility with single-phase and three-phase energy meters, and make the main control chip and metering chip consistent for single-phase and three-phase, reducing costs in all aspects from procurement, program writing to maintenance.

[0113] In one embodiment, the electricity meter further includes a communication chip, which is connected to the main control chip and is used to upload the electricity results to the power grid system.

[0114] The communication chip is connected to the main control chip and uploads the energy results of the single-phase energy meter or the three-phase energy meter obtained by the main control chip.

[0115] In this embodiment, by setting a communication chip in the electricity meter and connecting it to the main control chip, the electricity meter's power output is transmitted to the power grid system, facilitating functions such as remote meter reading and remote billing. The power company can also monitor the electricity meter's operating status and the user's electricity consumption in real time through the power output uploaded by the communication chip, and promptly handle any faults detected. This achieves compatibility with both single-phase and three-phase electricity meters, ensuring that the main control chip and metering chip are consistent for both single-phase and three-phase meters, thus reducing costs in various aspects from procurement and programming to maintenance.

[0116] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A single-phase metering and three-phase metering compatible circuit, characterized by, The compatible circuit comprises: The first metering chip, the second metering chip and the master control chip, the first end of the master control chip is used for receiving a power supply signal, the second end of the master control chip is connected with the first metering chip, and the third input end of the master control chip is connected with the second metering chip. The first metering chip is used for transmitting B-phase results into the master control chip, the second metering chip is used for transmitting C-phase results into the master control chip, and the master control chip is used for acquiring A-phase results, and three-phase electric energy results are obtained according to the A-phase results, the B-phase results and the C-phase results.

2. The compatibility circuit of claim 1, wherein, The compatible circuit further comprises: The A-phase acquisition circuit, the B-phase acquisition circuit and the C-phase acquisition circuit, the A-phase acquisition circuit is connected with the master control chip, the B-phase acquisition circuit is connected with the first metering chip, and the C-phase acquisition circuit is connected with the second metering chip.

3. A single-phase metering and three-phase metering compatible circuit, characterized by, The compatible circuit comprises: The first metering chip, the second metering chip, the master control chip and the serial port selection circuit, the first end of the master control chip is used for receiving a power supply signal, thesecond end of the master control chip is connected with the first input end of the serial port selection circuit, and the third end of the master control chip is connected with the first output end of the serial port selection circuit. The second input end of the serial port selection circuit is connected with the output end of the first metering chip, the second output end of the serial port selection circuit is connected with the first input end of the first metering chip, the third input end of the serial port selection circuit is connected with the output end of the second metering chip, and the third output end of the serial port selection circuit is connected with the first input end of the second metering chip. The first metering chip is used for transmitting B-phase results into themaster control chip, the second metering chip is used for transmitting C-phase results into the master controlchip, and the master control chip is used for acquiring A-phase results, and three-phase electric energyresults are obtained according to the A-phase results, the B-phase results and the C-phase results.

4. The compatibility circuit of claim 3, wherein, Serial port selection circuit comprises: The first switch and the second switch, one end of the first switch is connected with the second end of the master control chip, the other end of the first switch is connected with the first input end of the first metering chip, one end of the second switch is connected with the third end of the master control chip, and the other end of the second switch is connected with the output end of the first metering chip. The third switch and the fourth switch, one end of the third switch is connected with the second end of the master control chip, the other end of the third switch is connected with the first input end of the second metering chip, one end of the fourth switch is connected with the third end of the master control chip, and the other end of the fourth switch is connected with the output end of the second metering chip.

5. The compatibility circuit of claim 3, wherein, The serial port selection circuit comprises: The first single-pole double-throw switch and the second single-pole double-throw switch, the first end of the first single-pole double-throw switch is connected with the second end of the master control chip, the second end of the first single-pole double-throw switch is connected with the first input end of the first metering chip, the third end of the first single-pole double-throw switch is connected with the output end of the first metering chip, the first end of the second single-pole double-throw switch is connected with the second end of the master control chip, The first end of the second single-pole double-throw switch is connected to the third end of the main control chip, the second end of the second single-pole double-throw switch is connected to the first input end of the second metering chip, and the third end of the second single-pole double-throw switch is connected to the output end of the second metering chip.

6. The compatibility circuit according to any one of claims 4 or 5, characterized in that, The compatible circuit further comprises: An A-phase acquisition circuit, a B-phase acquisition circuit and a C-phase acquisition circuit, the A-phase acquisition circuit being connected to the main control chip, the B-phase acquisition circuit being connected to the first metering chip, and the C-phase acquisition circuit being connected to the second metering chip.

7. A single-phase metering and three-phase metering compatible electric energy meter, characterized by, The compatible electric energy meter is provided with the single-phase metering and three-phase metering compatible circuit as claimed in any one of claims 1 to 6.

8. The compatible electric energy meter according to claim 7, characterized in that, The electric energy meter further comprises a power supply, which is connected to the first end of the main control chip and used for supplying power to the main control chip.

9. The compatible electric energy meter according to claim 8, characterized in that, The electric energy meter further comprises a memory, which is connected to the main control chip and used for storing the electric energy result of the main control chip.

10. The compatible electric energy meter according to claim 9, characterized in that, The electric energy meter further comprises a communication chip, which is connected to the main control chip and used for uploading the electric energy result to a power grid system.

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