Power equipment for grounding detection and calibration of electric power meter

Abstract

The utility model discloses power equipment for grounding detection and calibration of an electric power meter. The power equipment comprises an electric energy supply circuit, an inverter circuit, a sensing circuit, an input circuit and a power supply control circuit. The input circuit inputs a calibration setting value. And the power supply control circuit adjusts the alternating-current electric energy output by the inverter circuit according to the calibration set value so as to control the common power supply of the inverter circuit and the mains supply to the load, so that the problem that the grounding detection signal lamp of the electric power meter is lightened is solved.

Description

Technical Field

[0001] This utility model relates to a power device, and more particularly to a power device for grounding detection and calibration of power meters. Background Technology

[0002] In some countries, to comply with regulations for power quality monitoring, independent electricity meters are required to check whether the power quality meets the standards. However, under different load characteristics, power quality, and meter sensitivity, the internal judgment circuit of the electricity meter often makes inaccurate judgments about the AC current of the power grid. This causes the earth detection indicator light on the electricity meter to light up continuously, resulting in a long-standing problem that bothers users. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a power device for grounding detection and calibration of power meters, which addresses the shortcomings of the prior art.

[0004] One embodiment of this utility model discloses a power device for grounding detection and calibration of an electricity meter, applicable to an electricity meter connected to mains power and having a grounding detection indicator light. The device includes: a power supply circuit; an inverter circuit electrically coupled to the power supply circuit, the mains power, and a load, which inverts the DC power output from the power supply circuit into AC power and supplies it to the load along with the mains power; a sensing circuit electrically coupled to the power supply circuit, the inverter circuit, the mains power, and the load; an input circuit for inputting a calibration setting value; and a power control circuit electrically coupled to the inverter circuit, the sensing circuit, and the input circuit. The power control circuit receives the sensing result from the sensing circuit and adjusts the AC power output from the inverter circuit according to the calibration setting value, thereby controlling the combined power supply of the inverter circuit and the mains power to the load.

[0005] Preferably, the power equipment for grounding detection and calibration of the power meter further includes a switching circuit electrically coupled to the power control circuit, the inverter circuit, the mains power, and the load; the switching circuit includes a first switch and a second switch connected to each other, the first switch and the second switch being selectively turned on according to the control of the power control circuit, so as to transmit at least one of the AC power output from the mains power and the AC power output from the inverter circuit to the load.

[0006] Preferably, the sensing circuit includes a first sensing circuit, and the sensing result of the sensing circuit includes the sensing result generated by the first sensing circuit sensing the mains power.

[0007] Preferably, the sensing circuit includes a second sensing circuit, and the sensing result of the sensing circuit includes the sensing result generated by the second sensing circuit sensing the power supply circuit.

[0008] Preferably, the sensing circuit includes a third sensing circuit, and the sensing result of the third sensing circuit includes the result generated by the third sensing circuit sensing the inverter circuit.

[0009] Preferably, the sensing circuit includes a fourth sensing circuit, and the sensing result of the sensing circuit includes the result generated by the fourth sensing circuit sensing the load.

[0010] Preferably, the power supply circuit includes at least one of a solar power supply circuit and a battery power supply circuit.

[0011] Preferably, a boost circuit is connected between the solar power supply circuit and the inverter circuit, and the boost circuit boosts the DC power output by the solar power supply circuit before outputting it.

[0012] Preferably, a charge-discharge conversion circuit is connected between the battery power supply circuit and the inverter circuit, the power control circuit is electrically coupled to the charge-discharge conversion circuit, and the power control circuit controls the charging and discharging operations of the battery power supply circuit through the charge-discharge conversion circuit.

[0013] Preferably, the power equipment for grounding detection and calibration of power meters further includes an operation panel. The operation panel is equipped with a display screen and the input circuit. When the grounding detection indicator light of the power meter connected to a power supply path between the mains power and the load is lit, the power control circuit receives and stores the calibration setting value input by the input circuit each time, and adjusts the AC power output of the inverter circuit accordingly, thereby controlling the common power supply of the inverter circuit and the mains power to the load. The power control circuit is electrically coupled to the display screen, which displays a grounding calibration setting item page containing the calibration setting value.

[0014] To further understand the features and technical content of this utility model, please refer to the following detailed description and drawings of this utility model. However, these descriptions and drawings are only used to illustrate this utility model and are not intended to limit the scope of protection of this utility model in any way. Attached Figure Description

[0015] Figure 1 This is a block diagram of a power equipment used for grounding detection and calibration of an electricity meter, according to an embodiment of the present invention.

[0016] Figure 2 This is a block diagram of a power equipment used for grounding detection and calibration of an electricity meter, according to another embodiment of the present invention.

[0017] Figure 3 This is a block diagram of a power equipment used for grounding detection and calibration of an electricity meter, according to another embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the external appearance of a power equipment used for grounding detection and calibration of an electricity meter, according to an embodiment of the present invention. Detailed Implementation

[0019] The following specific embodiments illustrate the implementation of the "power equipment for grounding detection and calibration of electricity meters" disclosed in this utility model. Those skilled in the art can understand the advantages and effects of this utility model from the content disclosed in this specification. This utility model can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this utility model. Furthermore, the accompanying drawings of this utility model are for simple illustrative purposes only and are not depictions of actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of this utility model in detail, but the disclosed content is not intended to limit the scope of protection of this utility model.

[0020] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used herein should, as appropriate, include any combination of one or more of the related listed items.

[0021] [Example]

[0022] Figure 1 This is a block diagram of a power equipment used for grounding detection and calibration of an electricity meter, according to an embodiment of this utility model. Please refer to [link / reference]. Figure 1 A power device (hereinafter referred to as power device 1) for grounding detection and calibration of an electricity meter is disclosed, applicable to an electricity meter M1 connected to the mains power E1 and equipped with a grounding detection indicator light. In practice, the electricity meter M1 is implemented, for example, as a mechanical meter, electronic meter, three-phase mechanical meter, three-phase electronic meter, or smart meter. In this embodiment, the electricity meter M1 uses its own detection circuit to measure the quantity, current, voltage, and current direction at the mains power E1 terminal to determine whether there is a grounding abnormality. When a grounding abnormality is detected, the grounding detection indicator light M11 of the electricity meter M1 will illuminate. Furthermore, the electricity meter M1 in this embodiment is an independent device and does not have any external communication lines to communicate with external devices.

[0023] In one embodiment of this technology, the power equipment 1 may include a switching circuit R, a power supply circuit 10, an inverter circuit 20, a sensing circuit 30, a power control circuit 40, and an input circuit 50.

[0024] The power supply circuit 10 is used to supply electrical energy. Further, the power supply circuit 10 may include, but is not limited to, a solar power supply circuit 101 and a battery power supply circuit 102. In practice, the solar power supply circuit 101 is implemented, for example, by one or a combination of a solar panel, a controller, and a solar energy storage device. The solar panel is used to receive solar energy. The solar energy storage device is used to convert solar energy into electrical energy. The controller controls the electrical energy output by the solar energy storage device through maximum power point tracking (MPPT), where MPPT detects the time of day or angle of sunlight when the maximum power is achieved. Additionally, the battery power supply circuit 102 is implemented, for example, by multiple batteries and related circuitry. This embodiment does not limit the configuration of the solar power supply circuit 101 and the battery power supply circuit 102.

[0025] Inverter circuit 20 is electrically coupled to power supply circuit 10, mains power E1, and load L1. Inverter circuit 20 converts the DC power output from power supply circuit 10 into AC power and supplies it to load L1 along with mains power E1. In practice, inverter circuit 20 is implemented, for example, using a grid-connected inverter, a full-bridge inverter, or a half-bridge inverter. Since solar power supply circuit 101 converts solar energy into DC power, inverter circuit 20 is needed to convert the DC power generated by solar power supply circuit 101 into AC power and supply the converted AC power to load L1. Similarly, since battery power supply circuit 102 outputs DC power, inverter circuit 20 is also needed to convert the DC power output from battery power supply circuit 102 into AC power and supply the converted AC power to load L1. This embodiment does not limit the form of inverter circuit 20.

[0026] The power control circuit 40 is electrically coupled to the inverter circuit 20. The power control circuit 40 controls the operation of the inverter circuit 20. More specifically, the power control circuit 40 controls the inverter circuit 20 to invert the DC power output from the solar power supply circuit 101 or the battery power supply circuit 102 to the AC power of the load L1, so that the inverter circuit 20 is controlled by the power control circuit 40 to supply AC power to the load L1.

[0027] The power control circuit 40 is electrically coupled to the switching circuit R, and the inverter circuit 20 is electrically coupled to the mains power E1 and the load L1 through the switching circuit R. Further, the switching circuit R includes a first switch R1 and a second switch R2 connected to each other. The first switch R1 and the second switch R2 are selectively turned on according to the control of the power control circuit 40 to transmit at least one of the AC power output from the mains power E1 and the AC power output from the inverter circuit 20 to the load L1. For example, the power control circuit 40 can control both the first switch R1 and the second switch R2 to be turned on to transmit the AC power output from the mains power E1 and the AC power output from the inverter circuit 20 to the load L1; alternatively, the power control circuit 40 can control the first switch R1 to be off and the second switch R2 to be on to transmit the AC power output from the inverter circuit 20 to the load L1. In practice, the first switch R1 and the second switch R2 can each be a relay. This embodiment does not limit the form of the switching circuit R.

[0028] The power control circuit 40 is electrically coupled to the sensing circuit 30. The sensing circuit 30 is also electrically coupled to the power supply circuit 10, the inverter circuit 20, the mains power E1, and the load L1. The input circuit 50 is electrically coupled to the power control circuit 40. The input circuit 50 receives a calibration setting value, and the power control circuit 40 adjusts the AC power output of the inverter circuit 20 according to this setting value, thereby controlling the combined power supply to the load L1 from the inverter circuit 20 and the mains power E1.

[0029] In one embodiment, the power control circuit 40 can receive the sensing results from the sensing circuit 30 and determine the operating state of the power device 1 based on the sensing results, such as which of a variety of predetermined operating conditions the power device 1 is currently operating under. Furthermore, the sensing circuit 30 in this embodiment may include, but is not limited to, a first sensing circuit 31, a second sensing circuit 32, a third sensing circuit 33, and a fourth sensing circuit 34. Moreover, the first sensing circuit 31, the second sensing circuit 32, the third sensing circuit 33, and the fourth sensing circuit 34 may be, but are not limited to, voltage or current sensing circuits.

[0030] Continuing from the above, the first sensing circuit 31 can be used to sense the mains power E1. The power control circuit 40 can, based on the sensing result generated by the first sensing circuit 31, digitize the sensing result through its internal analog-to-digital converter (ADC) sub-circuit to obtain the AC voltage or AC current input to the mains power E1 terminal, and thereby determine whether the power device 1 is in line mode. In this embodiment, the sensing result of the sensing circuit 30 may include, but is not limited to, the sensing result generated by the first sensing circuit 31 sensing the mains power E1. Furthermore, the first sensing circuit 31 may be located inside or outside the power control circuit 40, or outside the mains power E1, without limitation.

[0031] The second sensing circuit 32 can be used to sense the power supply circuit 10. The power control circuit 40 can, based on the sensing results generated by the second sensing circuit 32, obtain the output voltage and current of the solar power supply circuit 101 or the battery power supply circuit 102 of the power supply circuit 10 through its internal analog-to-digital converter (ADC) sub-circuit. This allows it to determine whether the power device 1 is in battery-existent mode or solar-existent mode. In this embodiment, the sensing results of the sensing circuit 30 may include, but are not limited to, the sensing results generated by the second sensing circuit 32 sensing the power supply circuit 10. Furthermore, the second sensing circuit 32 may be disposed within or outside the power control circuit 40, or separately within and outside the solar power supply circuit 101 and the battery power supply circuit 102; this is not limited.

[0032] The third sensing circuit 33 can be used to sense the inverter circuit 20. Based on the sensing results generated by the third sensing circuit 33, the power control circuit 40 can obtain the current output voltage and output current, or input voltage and input current, of the inverter circuit 20 through its internal analog-to-digital converter (ADC) sub-circuit. From this, it can determine the solar power (PV Power), battery power (Bat Power), or whether the power device 1 is operating in AC charging mode. In this embodiment, the sensing results of the sensing circuit 30 may include, but are not limited to, the sensing results generated by the third sensing circuit 33 sensing the inverter circuit 20. Furthermore, the third sensing circuit 33 can be located inside or outside the power control circuit 40, or inside or outside the inverter circuit 20; this is not limited.

[0033] The fourth sensing circuit 34 can be used to sense the load L1. Based on the sensing result of the fourth sensing circuit 34, the power control circuit 40 can obtain the load input current and load voltage at the load L1 terminal through its internal analog-to-digital converter (ADC) sub-circuit, and thereby determine the load power consumption. In this embodiment, the sensing result of the sensing circuit 30 may include, but is not limited to, the sensing result generated by the fourth sensing circuit 34 sensing the load L1. Furthermore, the fourth sensing circuit 34 is not limited to being located inside or outside the power control circuit 40, or inside or outside the load L1.

[0034] Based on the above, the power control circuit 40 can determine which of a variety of predetermined operating conditions the power device 1 is currently operating under, according to the sensing results generated by the sensing circuit 30 (which may include, but are not limited to, the sensing results generated by the first sensing circuit 31, the second sensing circuit 32, the third sensing circuit 33, and the fourth sensing circuit 34).

[0035] For example, the power control circuit 40 can determine, based on the sensing results generated by the sensing circuit 30, that the power device 1 is currently operating under one of the following fourteen predetermined operating conditions.

[0036] When the power equipment 1 is operating under the first operating condition, that is, when the power equipment 1 is operating in the mains power supply mode (Line Mode), battery exist mode, and the current value during AC charging is less than 15 amps.

[0037] When the power equipment 1 is operating under the second operating condition, that is, when the power equipment 1 is operating in the mains power supply mode (Line Mode), battery exist mode, and the current value during AC charging is between 15 and 35 amps.

[0038] When the power equipment 1 is operating under the third operating condition, that is, when the power equipment 1 is operating in the mains power supply mode (Line Mode), battery exist mode, and the current value during AC charging is between 35 and 60 amps.

[0039] When the power equipment 1 is operating under the fourth operating condition, that is, when the power equipment 1 is operating under the conditions of mains power supply mode (Line Mode), battery exist mode (Bat exist), and the AC charging current value is greater than or equal to 60 amps.

[0040] When the power equipment 1 is operating under the fifth operating condition, that is, when the power equipment 1 is operating under the conditions of mains power supply mode (Line Mode), battery exist mode (Bat exist), solar energy exist mode (PV exist), solar power supply (PVPower) is greater than battery power supply (Bat Power), and the power equipment 1 is a predetermined system model (e.g., 5K Model).

[0041] When the power equipment 1 is operating under the sixth operating condition, that is, when the power equipment 1 is operating under the following conditions: Line Mode, Battery Exist, Solar Exist, Solar Power (PVPower) is greater than Battery Power, and the power equipment 1 is not the aforementioned predetermined system model (e.g., not 5K Model).

[0042] When the power equipment 1 is operating under the seventh operating condition, that is, when the power equipment 1 is operating under the following conditions: Line Mode, Battery Exist, Solar Exist, Solar Power is less than Battery Power, and the AC charging current is less than 15 Amperes.

[0043] When the power equipment 1 is operating under the eighth operating condition, that is, when the power equipment 1 is operating under the following conditions: mains power supply mode, battery exist mode, solar energy exist mode, solar power supply (PVPower) is less than battery power supply (Bat Power), and the AC charging current value is between 15 and 25 amps.

[0044] When the power equipment 1 is operating under the ninth operating condition, that is, when the power equipment 1 is operating under the following conditions: mains power supply mode, battery exist mode, solar energy exist mode, solar power supply (PVPower) is less than battery power supply (Bat Power), and the AC charging current value is between 25 and 45 amps.

[0045] When the power equipment 1 is operating under the tenth operating condition, that is, the power equipment 1 is in the mains power supply mode (LineMode), battery exist mode (Bat exist), solar energy exist mode (PV exist), the solar power supply (PV Power) is less than the battery power supply (Bat Power), and the AC charging current value is between 45 and 55 amps.

[0046] When the power equipment 1 is operating under the eleventh operating condition, that is, the power equipment 1 is in the following operating conditions: Line Mode, Battery Exist, Solar Exist, Solar Power is less than Battery Power, and the AC charging current is greater than 55 Amperes.

[0047] When the power equipment 1 is operating under the twelfth operating condition, that is, when the power equipment 1 is operating under the line mode of mains power supply.

[0048] When the power equipment 1 is operating under the thirteenth operating condition, that is, when the power equipment 1 is operating under the conditions of mains power supply mode (Line Mode), solar energy existence mode (PV exist), and the load power consumption is greater than 1.5KW.

[0049] When the power equipment 1 is operating under the fourteenth operating condition, that is, when the power equipment 1 is operating under the conditions of mains power supply mode (Line Mode), solar energy existence mode (PV exist), and the load power consumption is less than 1.5KW.

[0050] From the above examples, the power control circuit 40 can determine, based on the sensing results generated by the sensing circuit 30, that the power device 1 is currently operating under one of a variety of predetermined operating conditions.

[0051] In one embodiment, the input circuit 50 can also input a calibration setting value based on the sensing result of the sensing circuit 30, and the power control circuit 40 receives and stores the calibration setting value input by the input circuit 50. Furthermore, when the ground detection indicator M11 of the power meter M1 is lit, the power control circuit 40 receives and stores the calibration setting value input by the input circuit 50, and adjusts the AC power output of the inverter circuit 20 according to the stored calibration setting value, thereby controlling the joint power supply of the inverter circuit 20 and the mains power E1 to the load L1. This solves the problem of the power meter M1 detecting an abnormality and causing the ground detection indicator M11 to light up. In other words, when the ground detection indicator M11 of the power meter M1, connected to a power supply path P1 between the mains power E1 and the load L1, is lit, the power control circuit 40 can receive and store the calibration setting value input by the input circuit 50 each time, and adjust the AC power output of the inverter circuit 20 accordingly, thereby controlling the joint power supply of the inverter circuit 20 and the mains power E1 to the load L1.

[0052] For example, when the ground detection indicator M11 of the power meter M1 is lit, the input circuit 50 can input a calibration setting value according to the sensing result of the sensing circuit 30, and the power control circuit 40 determines from the sensing result of the sensing circuit 30 that the power device 1 is operating under a thirteenth of the various predetermined operating conditions, namely, the power device 1 is operating under the conditions of mains power supply mode (Line Mode), solar energy existence mode (PV exist), and the load power consumption is less than 1.5KW. The power control circuit 40 receives and stores the calibration setting value (e.g., -1) input by the input circuit 50, and adjusts (e.g., reduces) the amplitude of the positive half-cycle or the negative half-cycle of the AC current inverted by the inverter circuit 20 according to the stored calibration setting value. This can adjust the deviation of the positive and negative half-cycles of the grid-connected AC current to near zero, that is, make the grid-connected AC current approach a symmetrical oscillation waveform, thereby solving the problem that the power meter M1 judges that there is an abnormality and causes the ground detection indicator M11 to light up. If the ground detection indicator M11 of the power meter M1 is still lit, the power control circuit 40 receives and stores the next calibration setting value (e.g., -2, with the lower limit to the upper limit being -30 to +30) input by the input circuit 50. That is, the power control circuit 40 adjusts the amplitude of the positive half-cycle or negative half-cycle of the AC current inverted by the inverter circuit 20 according to each input calibration setting value, gradually adjusting until the ground detection indicator M11 of the power meter M1 is turned off. Each adjusted calibration setting value is stored according to the current predetermined working conditions. Therefore, each time the input is made according to the current predetermined working conditions, the calibration setting value seen will be the previously stored calibration setting value.

[0053] Thus, the power control circuit 40 of the power equipment 1 of this utility model receives the calibration setting value input by the input circuit 50, and the power control circuit 40 adjusts the AC power output of the inverter circuit 20 according to the calibration setting value, thereby controlling the inverter circuit 20 and the mains power E1 to jointly supply power to the load L1, so as to solve the situation where the power meter M1 self-detects abnormality and lights up under the conditions of different load characteristics, different power quality and different sensitivity.

[0054] In this embodiment, the input circuit 50 may be implemented as, but is not limited to, an input interface, an input panel, or input function keys, which can be operated by a user or operator.

[0055] Figure 2 This is a schematic diagram of a power equipment used for grounding detection and calibration of an electricity meter, according to another embodiment of the present invention. Please refer to [link / reference]. Figure 2 .in Figure 2 Zhongyu Figure 1The electrical equipment 1b and 1 are similar, and the same components included in them will be referred to by the same reference numerals below. The differences between electrical equipment 1b and 1 are explained below.

[0056] In this embodiment, a boost circuit 60 is connected between the solar power supply circuit 101 of the power supply circuit 10 and the inverter circuit 20. The boost circuit 60 boosts the DC power output from the solar power supply circuit 101 and outputs it, so that the boosted DC power is inverted by the inverter circuit 20 to supply the load L1.

[0057] In this embodiment, a charge-discharge conversion circuit 70 is connected between the battery power supply circuit 102 of the power supply circuit 10 and the inverter circuit 20, and the power control circuit 40 is electrically coupled to the charge-discharge conversion circuit 70. The power control circuit 40 controls the charging and discharging operations of the battery power supply circuit 102 through the charge-discharge conversion circuit 70. That is, the power control circuit 40 controls the charging or discharging operations of the charge-discharge conversion circuit 70 and the battery power supply circuit 102. Furthermore, the power control circuit 40 can control the switch in the charge-discharge conversion circuit 70 to be turned on or off, so that the power flows bidirectionally. For example, after the power flows through the charge-discharge conversion circuit 70, it flows to the battery power supply circuit 102; or the power flows from the battery power supply circuit 102 through the charge-discharge conversion circuit 70, it flows to the inverter circuit 20. Furthermore, when the solar power cannot meet the operating requirements of the inverter circuit 20 and the battery power supply circuit 102 meets the discharge conditions, the battery power can be converted into DC power through the charge-discharge conversion circuit 70, and the DC power can be inverted by the inverter circuit 20 to supply the load L1.

[0058] Figure 3 This is a schematic diagram of a power equipment used for grounding detection and calibration of an electricity meter, according to another embodiment of the present invention. Please refer to [link / reference]. Figure 3 .in Figure 3 Zhongyu Figure 1 The electrical equipment 1c and 1 are similar, and the same components included in them will be referred to by the same reference numerals below. The differences between electrical equipment 1c and 1 are explained below.

[0059] In this embodiment, the power control circuit 40 is electrically coupled to a display screen 80. The display screen 80 is, for example, a liquid crystal display (LCD), and displays a ground calibration settings page 81.

[0060] Figure 4 This is a schematic diagram of the external appearance of a power equipment used for grounding detection and calibration of an electricity meter, according to an embodiment of this utility model. Please refer to... Figure 4The power equipment 1 also includes an operation panel 90. The operation panel 90 can be mounted on a body A1 of the power equipment 1. The operation panel 90 is equipped with a display screen 80 and an input circuit 50, and the display screen 80 displays a grounding calibration setting page 81 containing a calibration setting value (e.g., -1).

[0061] In summary, the power equipment provided by this utility model has an input circuit that inputs a calibration setting value, and a power control circuit that receives the sensing result from the sensing circuit. Based on the calibration setting value, the power output of the inverter circuit is adjusted, thereby controlling the combined power supply of the inverter circuit and the mains power to the load. This solves the problem of the power meter self-detecting an abnormality and lighting up under different load characteristics, power quality, and sensitivity conditions.

[0062] The above-disclosed content is only a preferred and feasible embodiment of the present utility model, and is not intended to limit the patent scope of the present utility model. Therefore, all equivalent technical changes made using the contents of the present utility model specification and drawings are included in the patent scope of the present utility model.

Claims

1. A power device for ground detection calibration of an electric power meter, suitable for connection to a power supply and having a ground detection signal light for an electric power meter, characterized by , comprising: a power supply circuit; an inverter circuit electrically coupled to the power supply circuit, the commercial power and a load, for inverting direct current power outputted from the power supply circuit into alternating current power and for supplying the alternating current power to the load together with the commercial power; a sensing circuit electrically coupled to the power supply circuit, the inverter circuit, the commercial power and the load; an input circuit inputting a calibration setting value; and a power control circuit electrically coupled to the inverter circuit, the sensing circuit and the input circuit, the power control circuit receiving a sensing result of the sensing circuit, and the power control circuit adjusting alternating current power outputted from the inverter circuit according to the calibration setting value, thereby controlling the inverter circuit and the commercial power to supply the load together.

2. The power device for ground detection calibration of an electric power meter according to claim 1, wherein, Further comprising a switching circuit electrically coupled to the power control circuit, the inverter circuit, the commercial power and the load, the switching circuit including a first switch and a second switch connected in series, the first switch and the second switch being selectively turned on according to the control of the power control circuit, so as to transmit at least one of alternating current power outputted from the commercial power and alternating current power outputted from the inverter circuit to the load.

3. The power device for ground detection calibration of an electric power meter of claim 1, wherein, The sensing circuit includes a first sensing circuit, and the sensing result of the sensing circuit includes a sensing result generated by the first sensing circuit sensing the commercial power.

4. The power device for ground detection calibration of an electric power meter of claim 3, wherein, The sensing circuit includes a second sensing circuit, and the sensing result of the sensing circuit includes a sensing result generated by the second sensing circuit sensing the power supply circuit.

5. The power device for ground detection calibration of an electric power meter of claim 4, wherein, The sensing circuit includes a third sensing circuit, and the sensing result of the sensing circuit includes a result generated by the third sensing circuit sensing the inverter circuit.

6. The power device for ground detection calibration of an electric power meter of claim 5, wherein, The sensing circuit includes a fourth sensing circuit, and the sensing result of the sensing circuit includes a result generated by the fourth sensing circuit sensing the load.

7. The power device for ground detection calibration of an electric power meter of claim 1, wherein, The power supply circuit includes at least one of a solar power supply circuit and a battery power supply circuit.

8. The power device for ground detection calibration of an electric power meter of claim 7, wherein, A boost circuit is connected between the solar power supply circuit and the inverter circuit, the boost circuit boosting direct current power outputted from the solar power supply circuit and outputting the boosted direct current power.

9. The power device for ground detection calibration of an electric power meter of claim 7, wherein, A charge-discharge conversion circuit is connected between the battery power supply circuit and the inverter circuit, the power control circuit being electrically coupled to the charge-discharge conversion circuit, and the power control circuit controlling charging operation and discharging operation of the battery power supply circuit through the charge-discharge conversion circuit.

10. The power device for ground detection calibration of an electric power meter of claim 1, wherein, Further comprising an operation panel, the operation panel being provided with a display screen and the input circuit, when a ground detection signal light of the power meter connected in a power supply path between the commercial power and the load is on, the power control circuit receiving and storing the calibration setting value inputted by the input circuit each time and adjusting alternating current power outputted from the inverter circuit step by step, thereby controlling the inverter circuit and the commercial power to supply the load together, the power control circuit being electrically coupled to the display screen, and the display screen displaying a ground calibration setting item page including the calibration setting value.

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