Single-transformer metering switch system

Abstract

The invention discloses a single mutual inductor metering switch system, which relates to the field of intelligent power systems and comprises a mutual inductor power supply module, a power supply management module, a main control module and a load module. The main control module executes a low-power-consumption control strategy to control the power management module and the load module to alternately switch and operate between a low-power-consumption sleep mode and a high-intensity working mode according to a preset time sequence. Electric energy and equipment states can be monitored in real time by utilizing power supply of a mutual inductor and a special power control algorithm; compared with the prior art, local data can be collected and controlled, the data can be reported in real time, remote internet-of-things management is achieved, compared with a traditional switching system, continuous energy consumption is compressed into extremely short pulse type consumption, equipment can complete all complex work in an extremely short time window in an explosive mode, and the energy consumption is reduced. And in other idle time, the system is in an ultra-low power consumption state of'false dead '.

Description

Technical Field

[0001] This invention relates to the field of intelligent power systems, specifically to a single transformer metering switch system. Background Technology

[0002] With the rapid development of power technology and intelligence, the demand for smart switches in smart homes and industrial automation is constantly increasing. In low-voltage power systems, the demand for intelligence, remote control, and data security analysis is increasing, and power consumption is also increasing. Traditional low-voltage switchgear uses linear transformers or switching power supplies for power supply. With the increase in power consumption, heat and size also increase, which is not conducive to the installation and safe use of switchgear. Traditional low-voltage switchgear can no longer meet the requirements of lower power consumption and intelligence. Therefore, developing a new generation of low-voltage high-performance power metering-free switch and edge computing function switch system has important technical and market value. Summary of the Invention

[0003] The purpose of this invention is to provide a single current transformer metering switch system that can draw power from the current transformer to power the switch control and detection circuits, and uses a special low-power algorithm to save energy. At the same time, it supports data acquisition and transmission, and realizes intelligent centralized management, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a single transformer metering switch system, comprising a transformer power supply module, a power management module, a main control module, and a load module. The transformer power supply module senses and acquires AC energy and converts it into DC power, and its output terminal is connected to the input terminal of the power management module. The power management module includes a charge / discharge management circuit and an energy storage element for storing and managing DC power, and for supplementing power supply when the output power of the transformer power supply module is insufficient. The main control module executes a low-power control strategy to control the power management module and the load module to alternately switch between a low-power sleep mode and a high-intensity operating mode according to a predetermined time sequence. The low-power sleep mode is configured to control the charge / discharge management chip to charge the energy storage element, and the high-intensity operating mode is configured to supply power to the energy storage element and control the metering unit to collect and process power parameters. The low-power control strategy includes a time synchronization routine for accurately capturing the zero-crossing point of the grid voltage and dynamically scheduling the switching between the low-power sleep mode and the high-intensity operating mode using the zero-crossing point as a time reference.

[0005] Preferably, the power management module further includes a MOSFET for power management. The MOSFET is disposed on the output path of the current transformer power supply module. The main control module switches the working state of the metering unit by controlling the on / off state of the MOSFET. When the MOSFET is off, the current transformer power supply module prioritizes charging the energy storage element. When the MOSFET is on, the metering unit enters the detection state, and the energy storage element supplies power to the load module.

[0006] Preferably, the time synchronization routine method includes using the ADC detection interface of the main control chip in the main control module to sample the grid voltage signal at a set time interval T1 and duration T2, recording the sampled voltage value and time point, locating the last voltage zero-crossing point, setting an offset time T3 based on the voltage zero-crossing point, setting the forward offset T3 as the time starting point, and starting a periodic timer of the time sequence. The interrupt of this timer is used as the trigger signal for the metering unit to perform detection state, thereby realizing the synchronization of the grid zero-crossing point and the sampling zero, ensuring the correctness of data acquisition and the accuracy of metering sampling.

[0007] Preferably, at the start of each detection state, the ADC detection interface of the main control chip captures the first zero-crossing signal and records the sampled voltage value and time point. When the next zero-crossing is detected, sampling stops, and the periodic timer is dynamically calibrated based on the deviation between the actual sampled zero-crossing time and the expected time of the timer.

[0008] Preferably, the low-power control strategy also includes a data restoration routine, which processes the sampled intermittent power parameter data, restores the data of missing periods, utilizes the periodicity and relative stability of the power signal, uses the data form of the previous period as a basic template, and dynamically corrects and "stretches" the template according to the data change trend of the latest acquisition period, thereby intelligently predicting the data of missing periods to generate a continuous monitoring data stream, and realizing the real-time monitoring and control of the entire power grid by the switching equipment.

[0009] Preferably, the data restoration routine employs at least one of weighted average, difference algorithm, and linear interpolation.

[0010] Preferably, the load module includes a controlled peripheral device, a communication unit, and a display unit, wherein the communication unit includes wireless Bluetooth communication.

[0011] Preferably, the low-power control strategy also includes time-division multiplexing routines to control the power consumption of the load module and the main control chip, maintain continuous connectivity and discoverability with external devices, and control the communication unit to enter a low-power listening mode during non-communication and non-display periods, and shut down the power supply channel of the unit module, only waking up the corresponding functional unit when data needs to be sent or the display needs to be updated.

[0012] Preferably, the predetermined time series is set to a period of 40ms, controlling the switching of the MOS transistor to make the metering unit work in cycles, with a single cycle including a 20ms power supply state and a 20ms detection state.

[0013] Preferably, the energy storage element includes a supercapacitor or a rechargeable button battery.

[0014] In summary, the beneficial effects of this invention are:

[0015] This invention utilizes the power supply of current transformers and a special power control algorithm to enable switching equipment to monitor power and equipment status in real time, process local data, and achieve intelligent control of local equipment. This improves the response speed and autonomy of the equipment. The switching equipment can combine wired and wireless communication networks to not only collect and control local data but also report data in real time, enabling remote IoT management. Compared with traditional switching systems, continuous energy consumption is compressed into extremely short pulse consumption. The equipment bursts through all complex tasks within a very short time window, while in the remaining idle time, it is in an ultra-low power consumption state of "false death" and fully accumulates energy for the next burst, forming a highly optimized energy-saving working mode of repeated cycles. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall process framework of a single current transformer metering switch system according to the present invention;

[0018] Figure 2 This is a schematic diagram of the charging and discharging management circuit in a single current transformer metering switch system according to the present invention. Figure 3 This is a schematic diagram of the charging and discharging management circuit in a single current transformer metering switch system according to the present invention.

[0019] Figure 4This is a schematic flowchart of an embodiment of a single transformer metering switch system according to the present invention. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0021] To facilitate understanding of the present invention, a more complete description of the invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the invention will be more thorough and complete.

[0022] All features disclosed in this specification, or steps in all methods or processes disclosed herein, may be combined in any way, except for mutually exclusive features and / or steps.

[0023] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of at least two elements or the interaction relationship of at least two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] The following is combined Figures 1-4 The present invention will be described in detail below. One embodiment of the present invention is a single current transformer metering switch system, which includes a current transformer power supply module, a power management module, a main control module and a load module.

[0026] The current transformer power supply module includes a standard metering current transformer. The induced current output is connected to a full-wave rectifier circuit to convert the induced AC energy into DC power. The output terminal is connected to the input terminal of the power management module to maximize the utilization of the induced power.

[0027] The power management module is used to store and manage DC power, and to provide supplementary power when the output power of the current transformer power supply module is insufficient;

[0028] It includes a charge / discharge management circuit, an energy storage element (which may be a supercapacitor or a rechargeable button battery), a MOSFET for power management, and a charge / discharge power management chip. The MOSFET is located in the output path of the current transformer power supply module. The main control module controls the switching of the MOSFET. When the MOSFET is off, the current transformer power supply module prioritizes charging the energy storage element. When the MOSFET is on, the energy storage element supplies power to the load module.

[0029] Main control module: Executes low-power control strategy to control the power management module and the load module to alternate between low-power sleep mode and high-intensity working mode according to a predetermined time sequence;

[0030] It includes a main control chip and a metering unit. The main control chip uses a low-power MCU, which makes the chip more energy-efficient when it is working and consumes less power in the energy-saving mode, ensuring energy saving and normal operation of the entire device. The low-power sleep mode is configured to control the charge and discharge management chip to charge the energy storage element, and the high-intensity working mode is configured to supply power to the energy storage element and control the metering unit to collect and process power parameters.

[0031] The load module includes controlled peripherals, a communication unit, and a display unit, wherein the communication unit includes wireless Bluetooth communication.

[0032] It is worth mentioning that the low-power control strategy described in this embodiment includes a time synchronization routine, a time-division multiplexing routine, and a data restoration routine;

[0033] The time synchronization routine described therein uses the changes in induced current generated by the current transformer to accurately capture the zero-crossing point of the grid voltage. It uses a high-precision clock circuit to achieve synchronization between the grid zero-crossing point and the sampling zero, ensuring the correctness of data acquisition and the accuracy of metering sampling. It also uses the zero-crossing point as a time reference to dynamically schedule the switching between the low-power sleep mode and the high-intensity working mode.

[0034] Specifically, the ADC detection interface of the main control chip in the main control module is used to sample the grid voltage signal at a set time interval T1 and duration T2, record the sampled voltage value and time point, and locate the last voltage zero crossing point. Based on the voltage zero crossing point, an offset time T3 is set, and the forward offset T3 is set as the time starting point. A periodic timer of the time sequence is started, and the interrupt of this timer is used as the trigger signal for the metering unit to detect the state, so as to realize the synchronization of the grid zero crossing point and the sampling zero.

[0035] For example, the electricity generated by the current transformer is sent to the main control chip through a sampling resistor and an amplification circuit. The main control chip detects the voltage every 20µs, continuously detecting the power grid signal for 30ms. The time and voltage value are recorded each time. Then, the point where the last detected voltage value is zero is found, the time is recorded, and 10µs is moved forward from this time as the starting point for timing 40ms. The timer is started to detect the signal from the zero-crossing point during working sampling.

[0036] It should be noted that, in order to ensure that the detection time is synchronized with the timer time, in this embodiment, at the beginning of each detection state, the ADC detection interface of the main control chip captures the first zero-crossing signal and records the sampled voltage value and time point. When the next zero-crossing is detected, sampling stops, and the periodic timer is dynamically calibrated according to the deviation between the actual sampled zero-crossing time and the expected time of the timer.

[0037] For example, during normal operation, after the timer expires at 40ms, the ADC starts detecting the voltage. When a zero-crossing is detected, the ADC interface starts acquiring the power grid signal and recording the time and value. When a zero-crossing is detected again, the ADC stops detecting data and processes the recorded data to find the position of the last zero-crossing. Then, the detection time and the timer time are compared. If a zero-crossing deviation is found, the timer is modified to ensure time synchronization. This ensures that a waveform of one cycle can be accurately acquired each time without wasting too much main control chip resources.

[0038] The time-division multiplexing routine is used to control the power consumption of the load module and the main control chip. The electrical energy generated by the transformer needs to power the circuit and also be used for grid signal detection. In order to ensure that power supply and detection are not interrupted, the power supply and detection of the transformer are time-division multiplexed. Based on the zero crossing point as the starting point, one cycle is used to power the circuit and charge the energy storage components, and the next cycle is used for grid signal detection. This alternation is carried out to achieve a balance between the two. A single cycle includes a 20ms power supply state and a 20ms detection state. At the same time, in order to save power as much as possible, the main control chip and peripheral circuits are put into sleep or low-power configuration when not in use, maintaining interrupt operation to ensure continuous circuit operation and maintain continuous connectivity and discoverability with external devices. During non-communication and non-display periods, the communication unit is controlled to enter a low-power listening mode and the power supply channel of the unit module is turned off. The corresponding functional unit is only woken up when data needs to be sent or the display needs to be updated.

[0039] The data restoration routine is used to process the intermittent power parameter data obtained from sampling, restore the data for missing periods, and utilize the periodicity and relative stability of power signals. It uses the data form of the previous period as a basic template, and dynamically corrects and "stretches" the template according to the data change trend of the latest collection period. This intelligently predicts the data for missing periods, generating a continuous monitoring data stream. This enables the switching equipment to monitor and control the entire power grid in real time. Each data acquisition is performed at one-period intervals. For data missing for one period, the data is supplemented based on the recorded data using an algorithm combining weighted averaging, difference algorithms, and linear principles, ensuring the integrity and accuracy of the data. This data is used to achieve real-time display of voltage, current, power, and status, and to control the switches to ensure the normal operation of the power grid equipment.

[0040] In actual operation, when the switch is powered on, an induced current is generated in the current transformer. After full-wave rectification, this current flows to the MOSFET in the power management circuit and the charge / discharge management chip. When the current transformer is supplying power, the MOSFET is off to ensure that the charge can accumulate and supply power to the power chip. Before the main chip is working, the MOSFET is also off by default. The charge / discharge management chip is in a charging state by default. The circuit is as follows: Figure 2As shown, after being powered on, the main chip enters the initialization state. First, it controls the MOSFET of the power management to remain in the off state, so that the current transformer can continuously supply power to the circuit. At the same time, the charge and discharge management chip continues to work in the charging state, so that the energy storage device can be charged with enough power. The main chip initializes internal data and parameters, initializes the metering chip and then puts it into sleep mode to reduce power consumption, initializes the external wired interface, enables reception and disables transmission, initializes the wireless Bluetooth device, configures it in low power mode so that it can be found and paired by external devices, initializes the display unit, sends display data and then closes the display channel, and turns it on again when there is display data.

[0041] Set a timer interrupt for 20µs, turn on the MOSFET, find the zero-crossing point of the power grid within 30ms, and after determining the zero-crossing point, change the timer to a 20ms interrupt 10µs before the zero-crossing point, turn off the MOSFET, and let the circuit work in the current transformer power supply state.

[0042] During the 40ms interrupt, the MOSFET is turned on, putting the current transformer into detection mode. The energy storage device is configured to supply power to the circuit. The main chip exits the low-power mode, and the metering chip exits the sleep mode. After the zero-crossing signal is detected, the metering chip and the main chip start sampling. The main chip reads the metering data from the metering chip, processes the energy data, displays the data, and sends communication data.

[0043] After the next zero-crossing signal is detected, the metering chip stops acquiring data, reads the metering data, processes the energy data, and saves the data. The main chip recalibrates the timer based on the acquired zero-crossing time offset. The MOSFET is disconnected, the current transformer processes the power supply state, the energy storage device is configured to charge, the metering chip enters sleep mode, and the main chip enters low-power mode.

[0044] The next 40ms interrupt will return to G and continue the loop.

[0045] The following is a specific application scenario: monitoring and protection of lighting circuits in intelligent industrial workshops.

[0046] Energy storage components: supercapacitors

[0047] Communication unit: Bluetooth Low Energy (BLE)

[0048] Load module: includes relays (controlled peripherals), BLE module, and LCD display unit (for local display of voltage, current, and power).

[0049] Main control chip: Ultra-low power MCU (such as TI's MSP430 series or ST's STM32L0 series)

[0050] Initial state:

[0051] When the system is first powered on, the supercapacitor is low on power, and the MOSFET is in the default off state. All the electrical energy sensed by the current transformer is used to charge the supercapacitor through the charge / discharge management chip. After the main control chip initializes, it controls the peripheral units to enter low-power mode and enters sleep mode itself, keeping only the timer interrupt active.

[0052] Synchronization and charging phase (first cycle)

[0053] Time synchronization routine startup: The main control MCU is woken up by the timer interrupt, turns on the MOSFET, and puts the system into a 20ms "detection state" (in fact, the first stage is used for synchronization).

[0054] The MCU's ADC interface begins sampling the rectified transformer voltage signal at an extremely high frequency (e.g., once every 20µs).

[0055] During continuous sampling, the MCU accurately captures the zero-crossing point of the grid voltage and sets this point forward by T3 (e.g., 10us) as the reference starting point for the entire time series.

[0056] After synchronization is complete, the MCU immediately disconnects the MOSFET, switching the system to a 20ms "power supply state". At this time, the power generated by the current transformer is no longer used for detection, but is prioritized for charging the supercapacitor. The MCU then enters low-power sleep mode again, waiting for a 40ms periodic timer interrupt.

[0057] Step Two: Normal alternating cycle operation (taking the second cycle as an example)

[0058] Timer interrupt trigger (40ms): MCU wakes up and turns on the MOSFET. The system enters a 20ms "high-intensity working mode" (detection state).

[0059] The supercapacitor begins to power the entire system (MCU, metering unit, communication unit, etc.).

[0060] The MCU and metering unit are fully activated and ready for action.

[0061] Data Acquisition: The MCU's ADC starts sampling the mains voltage and current signals with high precision for a full cycle (20ms) from a predetermined zero-crossing reference.

[0062] Data processing and restoration:

[0063] Scenario Trigger: During this sampling period, a large CNC machine tool in the workshop suddenly started, causing a brief voltage drop and current surge in the power grid.

[0064] The MCU read the abnormal data from this sampling: the effective voltage dropped from 220V to 210V, and the effective current surged to 7.5A.

[0065] Data restoration routine operation: Since the system samples once every cycle, the data from the previous cycle (40ms ago) was "voltage 220V, current 5.1A" (normal state). The data restoration algorithm (e.g., using a weighted average and difference algorithm) merges and corrects the normal waveform data from the previous cycle with the abnormal trend of the current cycle, intelligently generating estimated data for the missing cycle (between 20ms and 40ms), thus determining that this is a sudden, instantaneous anomaly, rather than a slow change.

[0066] Decision-making and action:

[0067] The MCU determines that the current has exceeded the set safety threshold (6A) based on the continuous (measured + restored) data stream.

[0068] It immediately controls the relay to disconnect, cutting off the lighting circuit and achieving the protection function.

[0069] Time-sharing repeater routine operation: The MCU wakes up the display unit only when action is needed, and flashes the values ​​of "overcurrent protection" and "7.5A" on the LCD; at the same time, it wakes up the Bluetooth module to package and send the "overcurrent alarm" information and key data to the gateway host in the workshop.

[0070] End of cycle and switching: The 20ms detection state ends, the MCU disconnects the MOSFET, the system switches back to the 20ms "low power sleep mode" (power supply state), the current transformer once again fully replenishes the supercapacitor with the power it just consumed, and the MCU goes into sleep mode.

[0071] Step 3: Remote Interaction

[0072] The workshop manager's mobile app (via Bluetooth gateway) received an alarm push notification.

[0073] The administrator arrived at the scene and confirmed that the problem was caused by the impact of the machine tool starting up, and no repairs were needed.

[0074] The administrator sends a "reset and close" command to the switch system via a mobile app.

[0075] The Bluetooth module receives the command and wakes up the MCU.

[0076] In the next working cycle, the MCU executes the relay closing operation, restoring power to the lighting circuit. The system continues to operate normally and is continuously monitored.

[0077] Therefore, the present invention has the following advantages in the above specific operational examples.

[0078] Power supply without power cord: The entire system does not require a separate power cord. It draws power directly from the current transformer of the cable under test, which simplifies the installation process and reduces wiring costs.

[0079] Low power consumption and energy balance: By employing time-sharing and alternating switching strategies, the conflict between "detection" and "self-powered operation" is perfectly resolved. Even during intermittent operation, stable operation can be guaranteed through supercapacitors.

[0080] Intelligent data restoration: When faced with transient anomalies in the case, the data restoration algorithm ensures that the system does not miss key events due to interval sampling, generates a continuous and accurate data stream for decision-making, and avoids misjudgment (such as thinking it is a slow overload) or omission.

[0081] High-precision measurement: The time synchronization routine ensures that each sampling starts from the zero crossing point, capturing the complete waveform. The calculated parameters such as voltage, current, and power are far more accurate than those of random sampling systems.

[0082] Intelligent and remote management: It integrates edge computing capabilities (such as overcurrent detection) and wireless communication functions, realizing true intelligent monitoring, protection and remote management, and meeting the needs of the Industrial Internet of Things.

[0083] The above description is merely a specific embodiment of the invention, but the scope of protection of the invention is not limited thereto. Any variations or substitutions conceived without inventive effort should be included within the scope of protection of the invention. Therefore, the scope of protection of the invention should be determined by the scope defined in the claims.

Claims

1. A single current transformer metering switch system, comprising a current transformer power supply module, a power management module, a main control module, and a load module, characterized in that: The current transformer power supply module senses and acquires AC energy and converts it into DC power. Its output terminal is connected to the input terminal of the power management module. The power management module includes a charge / discharge management circuit and an energy storage element for storing and managing DC power and providing supplementary power when the output power of the current transformer power supply module is insufficient. The main control module executes a low-power control strategy to control the power management module and the load module to alternately switch between a low-power sleep mode and a high-intensity operating mode according to a predetermined time sequence. The low-power sleep mode is configured to control the charge / discharge management chip to charge the energy storage element, and the high-intensity operating mode is configured to supply power to the energy storage element and control the metering unit to collect and process power parameters. The low-power control strategy includes a time synchronization routine for accurately capturing the zero-crossing point of the grid voltage and dynamically scheduling the switching between the low-power sleep mode and the high-intensity operating mode based on the zero-crossing point.

2. The single current transformer metering switch system according to claim 1, characterized in that: The power management module also includes a MOSFET for power management. The MOSFET is located in the output path of the current transformer power supply module. The main control module switches the working state of the metering unit by controlling the on / off state of the MOSFET. When the MOSFET is off, the current transformer power supply module prioritizes charging the energy storage element. When the MOSFET is on, the metering unit enters the detection state, and the energy storage element supplies power to the load module.

3. A single current transformer metering switch system according to claim 2, characterized in that: The time synchronization routine method includes using the ADC detection interface of the main control chip in the main control module to sample the grid voltage signal at a set time interval T1 and duration T2, recording the sampled voltage value and time point, locating the last voltage zero-crossing point, setting an offset time T3 based on the voltage zero-crossing point, setting the forward offset T3 as the time starting point, and starting a periodic timer for the time sequence. The interrupt of this timer is used as the trigger signal for the metering unit to perform detection state, thereby realizing the synchronization of the grid zero-crossing point and the sampling zero, ensuring the correctness of data acquisition and the accuracy of metering sampling.

4. A single current transformer metering switch system according to claim 3, characterized in that: At the start of each detection state, the ADC detection interface of the main control chip captures the first zero-crossing signal and records the sampled voltage value and time point. When the next zero-crossing is detected, sampling stops. The periodic timer is dynamically calibrated based on the deviation between the actual sampled zero-crossing time and the expected time of the timer.

5. A single current transformer metering switch system according to claim 4, characterized in that: The low-power control strategy also includes a data restoration routine, which processes the sampled intermittent power parameter data, restores the data of missing periods, utilizes the periodicity and relative stability of the power signal, uses the data form of the previous period as a basic template, and dynamically corrects and "stretches" the template according to the data change trend of the latest collection period, so as to intelligently predict the data of missing periods, generate a continuous monitoring data stream, and realize the real-time monitoring and control of the entire power grid by the switching equipment.

6. A single current transformer metering switch system according to claim 5, characterized in that: The data restoration routine employs at least one of weighted average, difference algorithm, and linear interpolation.

7. A single current transformer metering switch system according to claim 1, characterized in that: The load module includes a controlled peripheral device, a communication unit, and a display unit, and the communication unit includes wireless Bluetooth communication.

8. A single current transformer metering switch system according to claim 7, characterized in that: The low-power control strategy also includes time-division multiplexing routines, which are used to control the power consumption of the load module and the main control chip, maintain continuous connectivity and discoverability with external devices, and control the communication unit to enter a low-power listening mode during non-communication and non-display periods, and shut down the power supply channel of the unit module. The corresponding functional unit is only woken up when data needs to be sent or the display needs to be updated.

9. A single current transformer metering switch system according to claim 3, characterized in that: The predetermined time series is set to a period of 40ms, controlling the switching of the MOS transistor to make the metering unit work in cycles. Each cycle includes a 20ms power supply state and a 20ms detection state.

10. A single current transformer metering switch system according to claim 1, characterized in that: The energy storage element includes a supercapacitor or a rechargeable button battery.

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