Power supply system for energy-storage street lamp device

Abstract

A power supply system for an energy-storage street lamp device. An AC / DC constant current module, a DC metering module, and an LED light source form a first power supply line. An AC / DC voltage-limiting constant current module, the DC metering module, and the LED light source form a second power supply line. A battery, a charge-discharge management module, the DC metering module, and the LED light source form a third power supply line. A main control module is separately connected to the AC / DC constant current module, the charge-discharge management module, and the DC metering module. The main control module is configured to: by receiving a feedback signal output by the DC metering module, evaluate whether the AC / DC constant current module, the AC / DC voltage-limiting constant current module, and the battery have failed; and by means of start-stop control of the AC / DC constant current module and / or the AC / DC voltage-limiting constant current module and / or the charge-discharge management module, implement a redundant power supply function among the first power supply line, the second power supply line, and the third power supply line.

Description

A power supply system for an energy storage street light device Technical Field

[0001] This utility model belongs to the field of power equipment technology, and in particular relates to a power supply system for an energy storage street light device. Background Technology

[0002] Energy storage streetlights are intelligent streetlights that integrate an energy storage power supply system. They are generally equipped with energy storage devices such as batteries or supercapacitors and can be powered by mains power or batteries to supply power to LED light sources. The aim is to improve energy utilization efficiency and reduce dependence on the traditional power grid.

[0003] However, with current technology, when a single power conversion module fails, both the mains power supply line and the battery charging line will be open-circuited. When the battery is depleted, the street light will stop working. Therefore, the fault tolerance of existing energy storage street light circuit components is low, and if circuit faults are not dealt with in time, the street light will stop providing illumination.

[0004] Utility Model Content

[0005] This utility model aims to provide a power supply system for an energy storage street light device, in order to solve the technical problem that, under the existing technology, conventional energy storage street lights will directly interrupt lighting due to lack of power supply if the single power conversion module is damaged and not repaired in time.

[0006] To solve the above problems, the technical solution of this utility model is: an energy supply system for an energy storage street light device, comprising: a main control module, an AC / DC constant current module, an AC / DC voltage limiting constant current module, a DC metering module, and an LED light source;

[0007] The AC / DC constant current module, the DC metering module, and the LED light source form a first power supply line, wherein the input terminal of the AC / DC constant current module is connected to the mains power, and the output terminal of the AC / DC constant current module is connected to the LED light source after passing through the DC metering module;

[0008] The AC / DC voltage limiting and constant current module, the DC metering module, and the LED light source form a second power supply line. The input terminal of the AC / DC voltage limiting and constant current module is connected to the mains power, and the output terminal of the AC / DC voltage limiting and constant current module is connected to the LED light source after passing through the DC metering module.

[0009] The main control module is connected to the AC / DC constant current module, the AC / DC voltage limiting constant current module, and the DC metering module. The main control module is configured to evaluate whether the AC / DC constant current module and the AC / DC voltage limiting constant current module are malfunctioning by receiving feedback signals output by the DC metering module, and to realize the redundant power supply function of the first power supply line and the second power supply line by controlling the start and stop of the AC / DC constant current module and / or the AC / DC voltage limiting constant current module.

[0010] Preferably, the power supply system of the energy storage street light device is further provided with a charge and discharge management module and a battery. The battery, the charge and discharge management module, the DC metering module and the LED light source form a third power supply line. The output end of the battery is connected to the LED light source after passing through the charge and discharge management module and the DC metering module in sequence.

[0011] The main control module is further configured to assess whether the battery has failed by receiving feedback signals output by the DC metering module, and to control the start and stop of the battery through the charge and discharge management module, thereby realizing the power supply function of the third power supply line.

[0012] Preferably, a DC / DC constant current module is further provided between the output terminal of the charge / discharge management module and the input terminal of the DC metering module. The DC / DC constant current module is used to convert the DC current of different amplitudes output by the mains power and the battery into a DC current that is adapted to the LED light source.

[0013] Preferably, the first power supply line, the second power supply line, and the third power supply line are each equipped with a switch, and the main control module is connected to each switch. The main control module can control the opening and closing of each switch individually to achieve the connection or disconnection of the first power supply line, the second power supply line, and the third power supply line.

[0014] Preferably, the power supply system of the energy storage street light device further includes an AC / DC constant voltage module and a DC / DC constant voltage module. The input terminal of the AC / DC constant voltage module is connected to the mains power, and the output terminal of the AC / DC constant voltage module is connected to the main control module after passing through the DC / DC constant voltage module. The AC / DC constant voltage module is used to conduct mains power to supply energy to the main control module independently.

[0015] Preferably, one input terminal of the DC / DC constant voltage module is connected to the output terminal of the AC / DC constant voltage module, and the other input terminal of the DC / DC constant voltage module is also connected to the output terminal of the charge / discharge management module. The battery can supply power to the main control module through the charge / discharge management module.

[0016] Preferably, the power supply system of the energy storage street light device further includes a communication module. The power supply terminal of the communication module is connected to the output terminal of the DC / DC constant voltage module, and the communication terminal of the communication module is connected to the main control module. The communication module is configured such that when the AC / DC constant current module, the AC / DC voltage limiting constant current module, or the battery fails, the main control module can send a fault signal to an external platform through the communication module.

[0017] Preferably, the power supply system of the energy storage street light device further includes an auxiliary source output module. The input terminal of the auxiliary source output module is connected to the output terminal of the DC / DC constant voltage module, and the output terminal of the auxiliary source output module is connected to the power supply terminal of the external component. The auxiliary source output module is used to supply power to the external component.

[0018] Preferably, the energy supply system of the energy storage street light device further includes an AC metering module. The input terminal of the AC metering module is connected to the AC input terminal of the mains power, and the output terminal and communication terminal of the AC metering module are respectively connected to the AC / DC constant current module, the AC / DC voltage limiting constant current module, the AC / DC constant voltage module and the main control module. The AC metering module is used to detect the energy metering of the mains power.

[0019] Because of the adoption of the above technical solution, this utility model has the following advantages and positive effects compared with the prior art:

[0020] (1) In the power supply system of the energy storage street light device provided by this utility model, an AC / DC constant current module, an AC / DC voltage-limiting constant current module, and a battery are respectively provided. The AC / DC constant current module and the AC / DC voltage-limiting constant current module can be directly connected to the mains power and supply power to the LED light source through the first power supply line and the second power supply line, respectively. The AC / DC voltage-limiting constant current module can also be connected to the mains power to store energy for the battery. At the same time, the battery can also supply power to the LED light source through the third power supply line. Therefore, in this utility model, the first power supply line, the second power supply line, and the third power supply line form a redundant power supply line structure. When any module of the AC / DC constant current module, the AC / DC voltage-limiting constant current module, or the battery is damaged, the main control module can quickly switch to another power supply line to continue supplying power to the LED light source, ensuring the continuous lighting operation of the energy storage street light device.

[0021] (2) In the power supply system of the energy storage street light device provided by this utility model, the main control module can be powered directly by the mains power or by the battery. During peak power hours, the main control module is powered by the power stored in the battery in advance, which can effectively reduce the cost of electricity.

[0022] (3) In the power supply system of the energy storage street light device provided by this utility model, a communication module and an auxiliary source output module are also provided. When any or even all of the AC / DC constant current module, AC / DC voltage limiting constant current module and battery are damaged, the main control module can still send out fault signals, improve the real-time fault response of the energy storage street light device, and facilitate the maintenance of the energy storage street light device.

[0023] (4) In the power supply system of the energy storage street light device provided by this utility model, an AC metering module is also provided to detect the power metering of the mains power in advance. When the mains power fails, the main control module can switch the power supply mode to battery power in advance to avoid the interruption of LED light source and ensure the lighting operation stability of the energy storage street light device. Attached Figure Description

[0024] Figure 1 is a schematic diagram of the first structure of the energy supply system of the energy storage street light device provided by this utility model;

[0025] Figure 2 is a schematic diagram of the second structure of the energy supply system of the energy storage street light device provided by this utility model. Detailed Implementation

[0026] The energy supply system of the energy storage street light device proposed in this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer from the following description and claims.

[0027] Referring to Figures 1 and 2, this embodiment provides a power supply system for an energy storage street light device, enabling the energy storage street light device to have multiple power supply methods. Even if the electronic components of a single power supply line are damaged or fail, the energy storage street light device can still achieve normal lighting function.

[0028] The main power supply system of the energy storage street light device includes a main control module, an AC / DC constant current module, an AC / DC voltage limiting constant current module, a charge and discharge management module, a DC metering module, and an LED light source.

[0029] In this embodiment, an AC / DC constant current module, a DC metering module, and an LED light source form the first power supply line. The input terminal of the AC / DC constant current module is connected to the AC input terminal of the mains power supply, the output terminal of the AC / DC constant current module is connected to the first input terminal of the DC metering module, and the output terminal of the DC metering module is connected to the LED light source. The AC / DC constant current module converts AC power into a stable DC current output. Even if the input voltage or load changes, the output current can be maintained at a constant level. Therefore, in this embodiment, the AC / DC constant current module can convert the mains power into DC current suitable for the LED light source. The DC metering module is an electronic component used to measure electrical parameters such as voltage, current, and power of DC current. The communication terminal of the DC metering module is connected to the main control module. In this embodiment, the DC metering module can feed back the current parameters flowing through the first power supply line to the main control module. Based on the current parameters, the main control module can determine whether the AC / DC constant current module is damaged or malfunctioning.

[0030] An AC / DC voltage limiting constant current module, a charge / discharge management module, a DC metering module, and an LED light source form a second power supply line. The input terminal of the AC / DC voltage limiting constant current module is connected to the AC input terminal of the mains power, the output terminal of the AC / DC voltage limiting constant current module is connected to the first input terminal of the charge / discharge management module, the first output terminal of the charge / discharge management module is connected to the second input terminal of the DC metering module, and the output terminal of the DC metering module is connected to the LED light source. The AC / DC voltage limiting constant current module can convert AC power into a stable DC current output. Simultaneously, when the load resistance decreases, causing the current to increase, it can automatically reduce the output voltage to limit the current and prevent circuit overload. Therefore, in this embodiment, the AC / DC voltage limiting constant current module can convert the mains power into a DC current suitable for the LED light source. Since the AC / DC voltage limiting constant current module and the battery (described later) actually share the same circuit, and the current generated by the AC / DC voltage limiting constant current module can also provide energy storage for the battery, a voltage limiting function is provided to prevent circuit overload. The charge / discharge management module is an electronic component used to control battery charging and discharging as well as circuit switching. In this embodiment, the main control module can control the start and stop of the AC / DC voltage-limiting constant current module through the charge / discharge management module. That is, the redundant power supply system can decide whether to use the second power supply line as the power supply line for the LED light source. At the same time, the charge / discharge management module can also control the output terminal of the AC / DC voltage-limiting constant current module to be connected to the battery charging terminal, thus realizing the function of charging the battery using mains power. Similarly, the DC metering module can feed back the current parameters flowing through the second power supply line to the main control module. Based on the current parameters, the main control module can then determine whether the AC / DC voltage-limiting constant current module is damaged or malfunctioning.

[0031] Preferably, in one embodiment, the power supply system of the energy storage street light device further includes a battery. The battery, charge / discharge management module, DC metering module, and LED light source form a third power supply line. The battery output is connected to the second input of the charge / discharge management module, the first output of the charge / discharge management module is connected to the second input of the DC metering module, and the output of the DC metering module is connected to the LED light source. That is, part of the third power supply line overlaps with the second power supply line. In this embodiment, the power supply system of the energy storage street light device can control whether to use the battery as the power source through the charge / discharge management module, and use the third power supply line as the power supply line for the LED light source. Similarly, the DC metering module can feed back the current parameters flowing through the third power supply line to the main control module, and the main control module can determine whether the battery is damaged or depleted based on the current parameters. It is worth noting that although the second and third power supply lines share a partially overlapping circuit, preferably only one of the second or third power supply lines can be turned on at any given time to reduce power loss and prevent circuit overload.

[0032] The main control module is connected to the control terminals of the AC / DC constant current module and the charge / discharge management module, respectively. It can directly control the start / stop of the AC / DC constant current module and / or the AC / DC voltage-limiting constant current module and / or the battery. When the main control module starts the AC / DC constant current module, it controls the AC / DC voltage-limiting constant current module and the battery to be disabled via the charge / discharge management module. At this time, the second and third power supply lines are open circuits, while the first power supply line is closed. This means the redundant power supply system uses AC mains power to supply energy to the LED light source through the AC / DC constant current module. When the main control module enables the AC / DC voltage-limiting constant current module via the charge / discharge management module, the AC / DC constant current module and the battery are disabled. At this time, the second power supply line is closed, while the first and third power supply lines are open circuits. This means the redundant power supply system uses AC mains power to supply energy to the LED light source through the AC / DC voltage-limiting constant current module. When the main control module controls the battery to be activated through the charge and discharge management module, the AC / DC constant current module and the AC / DC voltage limiting constant current module are deactivated. At this time, the third power supply line is open, while the first power supply line and the second power supply line are closed. That is, the redundant power supply system uses the battery to directly supply power to the LED light source.

[0033] In summary, this embodiment provides a power supply system for an energy storage street light device, featuring three redundant power supply lines and two power supply modes. When any power conversion module fails, the main control module can utilize other power supply lines or modes to ensure continuous and stable lighting operation of the energy storage street light device. Specifically, when the AC / DC constant current module fails, the DC metering module sends an abnormal current signal from the first power supply line to the main control module. The main control module then disables the AC / DC constant current module and controls the second or third power supply line via the charge / discharge management module to ensure normal lighting operation of the energy storage street light device. When the AC / DC voltage-limiting constant current module fails, the DC metering module sends an abnormal current signal from the second power supply line to the main control module. The main control module then disables the AC / DC voltage-limiting constant current module via the charge / discharge management module, disconnects the second power supply line, and controls the AC / DC constant current module to activate or controls battery power supply via the charge / discharge management module to ensure normal lighting operation of the energy storage street light device. When the battery is damaged or the energy storage is depleted, the DC metering module sends an abnormal current signal from the third power supply line to the main control module. The main control module then controls the battery to stop working and the third power supply line to disconnect through the charge and discharge management module. It also controls the AC / DC constant current module to turn on or controls the AC / DC voltage-limiting constant current module to turn on through the charge and discharge management module, so that the energy storage street light device can operate normally using the mains power supply.

[0034] Meanwhile, the energy supply system of the energy storage street light device provided in this embodiment can also be used for peak-shaving storage of electrical energy, reducing electricity costs. Specifically, during peak power periods, the main control module can preferably control the third power supply line through the charge / discharge management module to supply power from the battery to the LED light source. When the battery is depleted, the main control module controls the AC / DC voltage-limiting constant current module to turn on, or controls the AC / DC constant current module to turn on, to supply power from the mains to the LED light source. During off-peak power periods, the main control module can preferably control the AC / DC constant current module to turn on, or controls the AC / DC voltage-limiting constant current module to turn on, to supply power from the mains to the LED light source. At the same time, the charge / discharge management module can also connect the output terminal of the AC / DC voltage-limiting constant current module to the battery charging terminal, utilizing the mains power during off-peak periods to charge the battery.

[0035] Preferably, in one embodiment, a DC / DC constant current module is further provided between the charge / discharge management module and the DC metering module. The first output terminal of the charge / discharge management module is connected to the input terminal of the DC / DC constant current module, and the output terminal of the DC / DC constant current module is connected to the second output terminal of the DC metering module. The DC / DC constant current module is used to convert any DC current into another DC current of a specific amplitude, and in the process, maintain the output current at a constant level. In this embodiment, since the second power supply line and the third power supply line share a partially overlapping circuit, the amplitude of the mains current output by the AC / DC voltage limiting constant current module is not the same as the amplitude of the current directly output by the battery. Through the DC / DC constant current module, the different amplitude DC currents output by the mains and the battery can be converted into DC currents suitable for the LED light source.

[0036] Preferably, in one embodiment, the first power supply line, the second power supply line, and the third power supply line may also be provided with a first switch, a second switch, and a third switch, respectively. The first switch, the second switch, and the third switch are directly connected to the main control module and are individually controlled by the main control module. That is, the main control module can realize the conduction or disconnection of the first power supply line, the second power supply line, and the third power supply line by individually controlling the opening and closing of each switch. In this embodiment, the first switch can be set at any position on the first power supply line from the AC input terminal to the first input terminal of the DC metering module, the second switch can be set on the second power supply line from the output terminal of the AC / DC voltage limiting constant current module to the first input terminal of the charge / discharge management module, and the third switch can be set on the third power supply line from the battery output terminal to the second input terminal of the charge / discharge management module.

[0037] Preferably, in one embodiment, the power supply system of the energy storage street light device further includes an AC / DC constant voltage module and a DC / DC constant voltage module. The input terminal of the AC / DC constant voltage module is connected to the AC input terminal of the mains power supply, the output terminal of the AC / DC constant voltage module is connected to the first input terminal of the DC / DC constant voltage module, and the first output terminal of the DC / DC constant voltage module is connected to the main control module. The AC / DC constant voltage module can convert AC power into a stable DC voltage output. In this embodiment, the AC / DC constant voltage module can convert the mains power into a DC voltage suitable for the main control module. Therefore, the main control module can be powered solely by the mains power supply. Even if the AC / DC constant current module and / or the AC / DC voltage-limiting constant current module are damaged, the normal operation of the main control module will not be affected.

[0038] Furthermore, the second input terminal of the DC / DC constant voltage module is connected to the second output terminal of the charge / discharge management module. The main control module can control the battery output terminal to conduct through the charge / discharge management module, thereby using the battery to power the main control module. The DC / DC constant voltage module converts the voltage of one DC power source into another stable DC voltage output. In this embodiment, since the amplitude of the AC / DC constant voltage output is different from the amplitude of the voltage directly output by the battery, the DC / DC constant voltage module can convert the different amplitude DC voltages from the AC / DC constant voltage module and the battery output into a DC voltage suitable for the LED light source. Through the redundant power supply line configuration of the main control module, during peak power periods, the main control module can be powered by the battery, further saving on energy costs. Furthermore, in this embodiment, the output terminal of the AC / DC voltage limiting constant current module can also be connected to the second input terminal of the DC / DC constant voltage module via the charge and discharge management module, thereby using the mains power of another line to supply power to the main control module. That is, if the AC / DC constant voltage module is damaged, in addition to supplying power to the main control module through the battery, it is also possible to select to supply power to the main control module through the AC / DC voltage limiting constant current module via another power supply line, still using the mains power.

[0039] Preferably, in one embodiment, the power supply system of the energy storage street light device is further provided with a communication module. The power supply terminal of the communication module is connected to the second output terminal of the DC / DC constant voltage module. During normal use of the power supply system of the energy storage street light device, the communication module can be directly powered by the mains power or by the battery through the AC / DC constant voltage module. At the same time, the communication terminal of the communication module is connected to the main control module. The communication module is configured to send a fault signal to an external platform through the communication module when the AC / DC constant current module, AC / DC voltage limiting constant current module, battery and / or AC / DC constant voltage module, etc., fail, so as to remind the staff that the internal electrical components of the energy storage street light device have failed, thus ensuring the timely maintenance of the energy storage street light device.

[0040] Furthermore, the energy supply system of the energy storage street light device is also equipped with an auxiliary source output module. The output end of the auxiliary source output module is connected to the power supply end of the external component, and the input end of the auxiliary source output module is connected to the third output end of the DC / DC constant voltage module. The external components include components such as cameras and alarms. In this embodiment, the external components can be powered by mains power or batteries through the auxiliary source output module.

[0041] Preferably, the energy supply system of the energy storage street light device is also equipped with an AC metering module. The AC metering module is located on the AC input side of the mains power, that is, the input end of the AC metering module is connected to the AC input end of the mains power. The output end of the AC metering module is connected to the input end of the AC / DC constant current module, the input end of the AC / DC voltage limiting constant current module, and the input end of the AC / DC constant voltage module, respectively. The communication end of the AC metering module is connected to the main control module. The AC metering module can be used to directly detect the energy metering of the mains power. In this embodiment, when a power outage occurs at the AC input terminal, if the LED light source is powered by AC, and the main control module detects abnormal current data through the DC metering module, the LED light source may have already been affected by unstable AC current and has turned off. Therefore, this embodiment further includes an AC metering module. The AC power input first passes through the AC metering module for detection before being transmitted to the AC / DC constant current module, AC / DC voltage limiting constant current module, and AC / DC constant voltage module. When a power outage occurs at the AC input terminal, the main control module can first detect abnormal current data through the AC metering module and immediately switch the power supply mode to battery power through the charge / discharge management module to prevent the LED light source from turning off. When the main control module detects that the current data has returned to normal through the AC metering module, it then switches the power supply mode back to AC power through the charge / discharge management module, thereby ensuring the stable and continuous operation of the LED light source.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A power supply system for an energy storage street light device, characterized in that, include: Main control module, AC / DC constant current module, AC / DC voltage limiting constant current module, DC metering module and LED light source; The AC / DC constant current module, the DC metering module, and the LED light source form a first power supply line, wherein the input terminal of the AC / DC constant current module is connected to the mains power, and the output terminal of the AC / DC constant current module is connected to the LED light source after passing through the DC metering module; The AC / DC voltage limiting and constant current module, the DC metering module, and the LED light source form a second power supply line. The input terminal of the AC / DC voltage limiting and constant current module is connected to the mains power, and the output terminal of the AC / DC voltage limiting and constant current module is connected to the LED light source after passing through the DC metering module. The main control module is connected to the AC / DC constant current module, the AC / DC voltage limiting constant current module, and the DC metering module. The main control module is configured to evaluate whether the AC / DC constant current module and the AC / DC voltage limiting constant current module are malfunctioning by receiving feedback signals output by the DC metering module, and to realize the redundant power supply function of the first power supply line and the second power supply line by controlling the start and stop of the AC / DC constant current module and / or the AC / DC voltage limiting constant current module.

2. The power supply system of the energy storage street light device as described in claim 1, characterized in that, It also includes a charge / discharge management module and a battery. The battery, the charge / discharge management module, the DC metering module, and the LED light source form a third power supply line. The output terminal of the battery is connected to the LED light source after passing through the charge / discharge management module and the DC metering module in sequence. The main control module is further configured to assess whether the battery has failed by receiving feedback signals output by the DC metering module, and to control the start and stop of the battery through the charge and discharge management module, thereby realizing the power supply function of the third power supply line.

3. The power supply system of the energy storage street light device as described in claim 1, characterized in that, A DC / DC constant current module is also provided between the output terminal of the charge / discharge management module and the input terminal of the DC metering module. The DC / DC constant current module is used to convert the DC current of different amplitudes output by the mains power and the battery into a DC current that is suitable for the LED light source.

4. The power supply system of the energy storage street light device as described in claim 2, characterized in that, Each of the first power supply line, the second power supply line, and the third power supply line is equipped with a switch. The main control module is connected to each switch. The main control module can control the opening and closing of each switch individually to achieve the connection or disconnection of the first power supply line, the second power supply line, and the third power supply line.

5. The power supply system of the energy storage street light device as described in claim 1, characterized in that, It also includes an AC / DC constant voltage module and a DC / DC constant voltage module. The input terminal of the AC / DC constant voltage module is connected to the mains power, and the output terminal of the AC / DC constant voltage module is connected to the main control module after passing through the DC / DC constant voltage module. The AC / DC constant voltage module is used to conduct mains power to supply power to the main control module separately.

6. The power supply system of the energy storage street light device as described in claim 5, characterized in that, One input terminal of the DC / DC constant voltage module is connected to the output terminal of the AC / DC constant voltage module, and the other input terminal of the DC / DC constant voltage module is also connected to the output terminal of the charge / discharge management module. The battery can supply power to the main control module through the charge / discharge management module.

7. The power supply system of the energy storage street light device as described in claim 6, characterized in that, It also includes a communication module, the power supply terminal of which is connected to the output terminal of the DC / DC constant voltage module, and the communication terminal of which is connected to the main control module. The communication module is configured such that when the AC / DC constant current module, the AC / DC voltage limiting constant current module, or the battery fails, the main control module can send a fault signal to an external platform through the communication module.

8. The power supply system of the energy storage street light device as described in claim 5, characterized in that, It also includes an auxiliary power source output module, the input terminal of which is connected to the output terminal of the DC / DC constant voltage module, and the output terminal of which is connected to the power supply terminal of the external component. The auxiliary power source output module is used to supply power to the external component.

9. The power supply system of the energy storage street light device as described in claim 1, characterized in that, It also includes an AC metering module, whose input terminal is connected to the AC input terminal of the mains power, and whose output terminal and communication terminal are respectively connected to the AC / DC constant current module, the AC / DC voltage limiting constant current module, the AC / DC constant voltage module and the main control module. The AC metering module is used to detect the energy metering of the mains power.

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