TWI637573B - Power monitoring system and current sensing module - Google Patents

Abstract

A power monitoring system includes at least one branch line device and a monitoring master station. The branch line device comprises K second power lines each transmitting a second driving power to the corresponding one of the transformer modules, K≧1; and K current sensing modules, each current sensing module sensing station Corresponding the second driving power to generate a sensing signal, the sensing signal indicating a current value of the second driving power currently transmitted by the second power line, and determining that the corresponding sensing signal indicates Whether the current value is greater than a critical current value, and when the determination result is YES, generating and transmitting a radio frequency output signal having a fault information and a number information to the monitoring main station. The monitoring main station displays the fault information and the number information corresponding to each RF output signal for monitoring.

Description

Power monitoring system and current sensing module

The invention relates to a monitoring system and a sensing module, in particular to a power monitoring system and a current sensing module for a power distribution system.

The existing power distribution system includes a power conversion main device, a plurality of four-way switching devices, a plurality of branch line devices, and a monitoring main station. The four-way switching devices are connected in series to each other and electrically connected to the substation master. Each of the four-way switching devices is also electrically connected to two corresponding branch line devices. Each of the branch line devices includes a plurality of power lines electrically connected to the plurality of transformer modules, and a plurality of current sensing modules respectively serving as fault indicators. Each current sensing module is electrically connected to the corresponding transformer module via the corresponding power line. The substation master device supplies power to the transformer modules via the respective power lines in each of the four-way switching devices and the corresponding branch line devices. Each of the four-way switching devices can be used to detect a driving power received by each of the branch line devices. When a four-way switching device detects that a current value of the driving power received by a corresponding branch line device is greater than a critical current value (ie, in the power line of the certain branch line device) If a fault occurs in one of the faults, the four-way switch device transmits a fault flag to the monitoring master station through a fiber-optic communication mode, so that the tester can learn from the monitoring master station. A branch line device has failed. Each current sensing module can continuously sense the power of the transformer module corresponding to the corresponding power line input to determine whether the power line of the corresponding electrical connection is faulty (eg, an overcurrent occurs), and When the judgment result is YES, the current sensing module illuminates an indicator light included therein.

However, the power distribution fault occurs mostly in the power lines in each of the branch line devices, because each current sensing module does not generate a fault flag when a fault occurs, and the fault flag is transmitted back through the communication method. To the monitoring main station. Therefore, the inspector can only know from the monitoring main station which branch line device has failed, and it is unknown where the power line in the branch line device in which the failure has failed. That is to say, the existing power distribution system must pass through the indicators of all the current sensing modules electrically connected to the faulty branch line device to check whether the fault is brightened to confirm the fault location, thereby causing the existing power distribution system. The time required to complete Fault Detection Isolation and Restoration (FDIR) is extended and it takes a lot of manpower. In addition, the power required by each current sensing module comes from a battery. Since the battery has limited power, the tester needs to periodically replace the battery at the position where each current sensing module is located, which is inconvenient for the user. use.

Accordingly, it is an object of the present invention to provide a power monitoring system that overcomes the shortcomings of the prior art.

Therefore, the power monitoring system of the present invention is suitable for electrically connecting a plurality of transformer modules, and includes at least one branch line device and a monitoring main station.

The at least one branch line device includes a first power line, K second power lines, and K current sensing modules.

The first power line receives and transmits a first driving power.

Each of the second power lines is electrically connected between the first power line and the corresponding transformer module, the K second power lines are spaced apart from each other, and each of the second power lines transmits a second driving power to the corresponding transformer The module, the second driving power is related to the first driving power, and K is a positive integer, K≧1.

Each current sensing module senses the second driving power transmitted by the corresponding second power line to generate a sensing signal, the sensing signal indicating the second driving power currently transmitted by the second power line a current value, each current sensing module determines whether the current value indicated by the corresponding sensing signal is greater than a critical current value, and generates and transmits an RF output signal when the determination result is yes, The RF output signal has a fault information for indicating an overcurrent and a number information for indicating a corresponding identification code of the corresponding current sensing module.

The monitoring main station receives the RF output signal having the fault information and the number information from each current sensing module whose determination result is yes, and displays the fault information and the number information corresponding to each RF output signal. Lee monitoring.

Accordingly, it is another object of the present invention to provide a current sensing module that overcomes the shortcomings of the prior art.

Therefore, the current sensing module of the present invention is applicable to a branch line device including a second power line for transmitting a second driving power. The current sensing module comprises a current transformer unit, a rectifying unit, a super capacitor, a power management chip, a current sampling unit, an antenna and a radio frequency transceiver chip.

The comparator unit generates an induced signal related to the second driving power according to the second driving power transmitted by the second power line, and senses the second driving power transmitted by the second power line to generate And a sensing signal indicating a current value of the second driving power that is currently transmitted by the second power line.

The rectifying unit is electrically connected to the current transformer unit to receive the sensing signal, and generates a rectified current according to the sensing signal.

The power management chip is electrically connected between the rectifying unit and the super capacitor, and receives the rectified current from the rectifying unit, and when the current value of the rectified current is greater than or equal to a predetermined current value, the power management chip is rectified according to the rectifying current The current supplies a power source and outputs the power source to the super capacitor so that the super capacitor is charged according to the power source.

The current sampling unit is electrically connected to the power management chip and the current comparator unit to respectively receive the power source and the sensing signal, and generate an analog sensing signal according to the sensing signal, wherein the current magnitude of the analog sensing signal is followed. The current of the second driving power changes.

The antenna is used to transmit an RF output signal.

The RF transceiver chip is electrically connected to the antenna, and electrically connected to the power management chip and the current sampling unit to respectively receive the power source and the analog sensing signal, and convert the analog sensing signal into a digital sensing signal, and The digital sensing signal is sampled and calculated to obtain a current value of the second driving power, and it is determined whether the current value of the second driving power is greater than a critical current value. When the determination result is yes, the RF transceiver chip is generated. a fault flag is transmitted to the antenna, and is transmitted by the antenna as the RF output signal, the fault flag includes a fault information for indicating an overcurrent and a corresponding indication One of the current sensing modules corresponds to the number information of the identification code.

The effect of the present invention is that each current sensing module senses and determines whether the corresponding second driving power has an overcurrent, and when the determination result is yes, sends the radio frequency output signal to the monitoring. The main station is monitored by the detecting personnel, and the detecting personnel can immediately perform failure on the second power line electrically connected to each current sensing module indicating the occurrence of an overcurrent and the first power line adjacent to the second power line. The detection of the isolation and the re-powering makes the time required for the power monitoring system of the present invention to complete the fault detection isolation and re-power reduction, and does not require a large manpower.

Referring to Figure 1, an embodiment of the power monitoring system 1 of the present invention is applicable to a power distribution system 10. The power distribution system 10 includes a power conversion main unit (not shown), a plurality of four-way switching devices (not shown), and a plurality of transformer modules 100. The four-way switching devices are connected in series to each other and electrically connected to the substation master. The power monitoring system 1 is applicable to the four-way switching device and the transformer module 100 corresponding to the electrical connection, and includes at least one branch line device 2 and one monitoring main station 3.

In this embodiment, the at least one branch line device 2 is electrically connected to the corresponding four-way switch device and the transformer module 100. The substation main device supplies power to the transformer modules 100 via each of the four-way switching devices and the at least one branch line device 2 corresponding to each of the four-way switching devices. It should be noted that the number of the at least one branch line device 2 is one, but is not limited thereto.

The branch line device 2 includes a first power line 21, K second power lines 22, and K current sensing modules 23, and K is a positive integer, K≧1. In the present embodiment, K=3 is taken as an example, but is not limited thereto.

The first power line 21 is electrically connected to the corresponding four-way switching device to receive and transmit a first driving power.

Each of the second power lines 22 is electrically connected between the first power line 21 and the corresponding transformer module 100, and the three second power lines 22 are spaced apart from each other. Each second power line 22 transmits a second driving power to the corresponding transformer module 100. The second driving power is related to the first driving power.

Each current sensing module 23 generates a sensing signal related to the second driving power according to the corresponding second driving power transmitted by the second power line 22, and senses the corresponding second power line 22 The second driving power is transmitted to generate a sensing signal. The sensing signal indicates a current value of the second driving power that is currently transmitted by the second power line 22. Each current sensing module 23 determines whether the current value indicated by the corresponding sensing signal is greater than a critical current value, and generates and transmits a radio frequency output signal RF1 when the determination result is YES. The RF output signal RF1 has a fault information for indicating an overcurrent and a number information for indicating a corresponding identification code of the corresponding current sensing module 23. Referring to FIG. 2, in the embodiment, each current sensing module 23 includes a comparator unit 20, a rectifying unit 231, a super capacitor 232, a power management chip 233, a current sampling unit 234, and a day. Line 235, a radio frequency transceiver chip 236 and an indicator light 237.

The comparator unit 20 generates the sensing signal according to the corresponding second driving power transmitted by the second power line 22, and senses the corresponding second driving power transmitted by the second power line 22 to The sensing signal is generated. In this embodiment, the current divider unit 20 includes a first current comparator 201 and a second current comparator 202.

The first current comparator 201 generates the sensing signal according to the corresponding second driving power transmitted by the second power line 22. It should be noted that the first current comparator 201 converts the second driving power into the sensing signal at an appropriate ratio by using an electromagnetic induction method.

The second current comparator 202 senses the corresponding second driving power transmitted by the second power line 22 to generate the sensing signal. In this embodiment, the second current comparator 202 is a Rogowski current comparator, which mainly uses a Rogowski current sensing method to obtain the sensing signal.

The rectifying unit 231 is electrically connected to the first current comparator 201 of the current comparator unit 20 to receive the sensing signal, and generates a rectifying current Ir according to the sensing signal.

The power management chip 233 is electrically connected to the rectifying unit 231 and the super capacitor 25, and receives the rectified current Ir from the rectifying unit 231. When a current value of the rectified current Ir is greater than or equal to a predetermined current value, the power management wafer 233 supplies a power source P1 according to the rectified current Ir, and outputs the power source P1 to the super capacitor 232, so that the super capacitor 232 Charging is performed according to the power source P1. When the current value of the rectified current Ir is less than the predetermined current value, the power management chip 233 stops supplying power to the super capacitor 232, and supplies the power source P1 to the current sampling unit 234 according to the amount of power stored in the super capacitor 232. And the RF transceiver chip 236.

The current sampling unit 234 is electrically connected to the power management chip 233 and the second current comparator 202 of the comparator unit 20 to respectively receive the power source P1 and the sensing signal, and generate an analog sensing according to the sensing signal. Signal A1. The magnitude of the current of the analog sensing signal A1 is a current change following the corresponding second driving power.

The antenna 235 is configured to transmit the RF output signal RF1.

The RF transceiver chip 236 is electrically connected to the indicator light 237, the antenna 235, and electrically connected to the power management chip 233 and the current sampling unit 234 to receive the power source P1 and the analog sensing signal A1, respectively. The RF transceiver chip 236 converts the analog sensing signal A1 into a digital sensing signal, and samples and calculates the digital sensing signal to obtain the corresponding current value of the second driving power, and determines the corresponding Whether the current value of the second driving power is greater than the critical current value. When the determination result is YES, the RF transceiver chip 236 generates a fault flag f1 including the fault information and the number information, and transmits the fault flag f1 to the antenna 235, and is transmitted by the antenna 235 and The RF output signal RF1. At the same time, the RF transceiver chip 236 also generates a driving signal D1, and outputs the driving signal D1 to the indicator light 237, so that the indicator light 237 is illuminated according to the driving signal D1.

The monitoring main station 3 receives the RF output signal RF1 having the fault information and the number information from each current sensing module 23 whose determination result is yes, and displays the fault information corresponding to each RF output signal RF1 and This number information is used for monitoring. In this embodiment, the monitoring main station 3 includes a first communication unit 31, a base station 32, a second communication unit 33, and a geographic map host 34.

The first communication unit 31 receives the RF output signal RF1 having the fault information and the number information transmitted by the antenna 235 of each current sensing module 23 that is determined to be YES, and according to the RF output The signal RF1 generates a first communication signal, the first communication signal carrying the RF output signal RF1. It should be noted that the first communication unit 31 and each current sensing module 23 communicate through a short-distance radio frequency communication method. In addition, in the present embodiment, only one first communication unit 31 is taken as an example, but is not limited thereto. In other embodiments, when the branch line device 2 includes more of the current sensing modules 23, or the power monitoring system 1 includes more of the branch line devices 2, the monitoring main station 3 may include multiple The first communication unit 31 (each of which is disposed adjacent to the corresponding plurality of the current sensing modules 23), and each of the first communication units 31 receives each current sensing mode adjacent to itself The RF output signal RF1 transmitted by the antenna 235 of the group 23.

The base station 32 receives and outputs the first communication signal. In this embodiment, the base station 32 communicates with the first communication unit 31 via a Long Range wireless communication method, but is not limited thereto.

The second communication unit 33 is electrically connected to the base station 32 to receive the first communication signal, and generates a second communication signal according to the first communication signal. The second communication signal has the fault information and the number information corresponding to each RF output signal RF1.

The geographic map host 34 stores a geographic map information, and receives the second communication signal, and determines, according to the geographic map information and each number information in the second communication signal, the corresponding indication that an overcurrent has occurred. The location of the current sensing module 23 is corresponding to the fault information, the number information, and the geographic location of the current sensing module 23 indicating the occurrence of an overcurrent for the monitoring personnel to monitor (ie, the detecting personnel can visually The current sensing module 23 indicating that an overcurrent is generated is immediately subjected to data query and fault immediate positioning. In this way, the inspector can quickly know the location of the current sensing module 23 indicating the occurrence of an overcurrent, and immediately perform Fault Detection Isolation and Restoration (FDIR). It should be noted that, in this embodiment, the geographic map host 34 and the second communication unit 33 communicate through a fourth generation (4G) mobile communication network, but are not limited thereto.

In addition, the geographic map host 34 can also generate a control signal and transmit the control signal to the second communication unit 33, such that the second communication unit 33 also generates a control output according to the control signal. The control output is transmitted to the first communication unit 31 via the base station 32, and the first communication unit 31 generates and transmits a radio frequency control signal RF2 according to the control output. Then, a corresponding one of the antennas 235 of the three current sensing modules 23 (eg, the first current sensing module 23 in FIG. 1) further receives the RF control from the first communication unit 31. The signal RF2, and the radio frequency transceiver chip 236 corresponding to the corresponding one of the antennas 235 is also currently transmitted by the corresponding second power line 22 when the corresponding antenna control signal RF2 is received by the antenna 235. The information of the current value of the second driving power is transmitted to the geographic map host 34 via the corresponding antenna 235, the first communication unit 31, the base station 32, and the second communication unit 33 to update the The related information displayed by the geographic map host 34.

It should be noted that, in this embodiment, the geographic map host 34 generates a control signal as an example, but is not limited thereto. In other embodiments, the geographic map host 34 can also generate three (or more than three) control signals such that the first communication unit 31 generates and transmits three radio frequency control signals RF2 such that the three current senses The antennas 235 of the module 23 receive the RF control signal RF2, and each of the RF transceiver chips 236 of the three current sensing modules 23 will correspond to the current second power line 22. And transmitting the information of the current value of the second driving power to the geographic map host 34 via the corresponding antenna 235, the first communication unit 31, the base station 32, and the second communication unit 33, and so on. The geographic map host 34 updates the related information displayed by it.

In summary, when the branch line device 2 generates an overcurrent due to a fault, the current sensing module 23 automatically senses and determines the corresponding number transmitted by the second power line 22 corresponding thereto. Whether the secondary driving power has an overcurrent, and when the determination result is yes, the RF output signal RF1 is actively sent to the monitoring main station 3, and the geographic map host 34 correspondingly displays each current sensing indicating that an overcurrent occurs. The location of the module 23 and the fault information corresponding thereto are monitored by the detecting personnel, and the detecting personnel can immediately connect the second power line 22 and the electrical connection corresponding to each of the current sensing modules 23 indicating the occurrence of an overcurrent. The portion of the second power line 22 adjacent to the first power line 21 is quickly located in the fault interval, without the need for the existing power distribution system to detect one of the current sensing modules in the faulty line circuit. Knowing where the power lines are faulty, the time required for the power monitoring system 1 of the present invention to complete the re-powering is reduced, and no significant manpower is required. In addition, the power required by each current sensing module 23 is from one of the second driving power and the corresponding super capacitor 232 transmitted by the corresponding second power line 22, so the present invention The current sensing module 23 does not need to replace the battery as the current current sensing module, which is more convenient for the user to use.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

1‧‧‧Power Monitoring System

10‧‧‧Power distribution system

100‧‧‧Transformer Module

2‧‧‧Difference line device

20‧‧‧ratio unit

201‧‧‧First current comparator

202‧‧‧Second current comparator

21‧‧‧First power line

22‧‧‧second power line

23‧‧‧ Current sensing module

231‧‧‧Rectifier unit

232‧‧‧Supercapacitors

233‧‧‧Power Management Wafer

234‧‧‧current sampling unit

235‧‧‧Antenna

236‧‧‧RF Transceiver

237‧‧‧ indicator light

3‧‧‧Monitor main station

31‧‧‧First communication unit

32‧‧‧Base station

33‧‧‧Second communication unit

34‧‧‧Geographic map host

A1‧‧‧ analog sensing signal

D1‧‧‧ drive signal

F1‧‧‧Fault flag

Ir‧‧‧ rectified current

P1‧‧‧ power supply

RF1‧‧‧RF output signal

RF2‧‧‧RF control signal

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: Figure 1 is a block diagram illustrating one embodiment of the power monitoring system of the present invention; and Figure 2 is a circuit block diagram A current sensing module of one embodiment is described.

Claims (7)

A power monitoring system, configured to electrically connect a plurality of transformer modules, and comprising: at least one branch line device, including a first power line, receiving and transmitting a first driving power, K second power lines, and each second power line Electrically connected between the first power line and the corresponding transformer module, the K second power lines are spaced apart from each other, and each second power line transmits a second driving power to the corresponding transformer module, the first The second driving power is related to the first driving power, K is a positive integer, K≧1, and K current sensing modules, and each current sensing module senses the corresponding second power line Driving the power to generate a sensing signal, the sensing signal indicating a current value of the second driving power that is currently transmitted by the second power line, and each current sensing module determines the corresponding sensing signal Determining whether the current value is greater than a critical current value, and when the determination result is yes, generating and transmitting an RF output signal, the RF output signal having a fault information for indicating an overcurrent and a And indicating, by the indicator, one of the current sensing modules corresponding to the number of the identification code; and a monitoring main station, receiving the fault information and the number information from each current sensing module whose determination result is yes The RF output signal displays the fault information and the number information corresponding to each RF output signal for monitoring; each current sensing module is further configured according to the corresponding second power line Transmitting the second driving power to generate a sensing signal related to the second driving power, and each current sensing module comprises: a current comparator unit, according to the corresponding second power line Driving power, generating the sensing signal, and sensing the corresponding second driving power transmitted by the second power line to generate the sensing signal; and a rectifying unit electrically connecting the current unit to receive the sensing And generating a rectified current according to the sensing signal; a super capacitor; a power management chip electrically connected between the rectifying unit and the super capacitor, receiving the rectified current from the rectifying unit, and when the rectifying current is one When the current value is greater than or equal to a predetermined current value, the power management chip supplies a power source according to the rectified current, and outputs the power source to the super capacitor, so that the super capacitor is charged according to the power source; a current sampling unit, and the electrical connection The power management chip and the comparator unit respectively receive the power source and the sensing signal, and generate an analog sensing according to the sensing signal No. The magnitude of the current of the analog signal is a current change of the corresponding second driving power; an antenna for transmitting the RF output signal; and an RF transceiver chip electrically connecting the antenna and electrically connecting the antenna The power management chip and the current sampling unit respectively receive the power source and the analog sensing signal, and convert the analog sensing signal into a digital sensing signal, and sample and calculate the digital sensing signal to obtain a corresponding The current value of the second driving power, and determining the corresponding second driving power Whether the current value of the force is greater than the critical current value, when the determination result is yes, the radio frequency transceiver chip generates a fault flag including the fault information and the number information, and transmits the fault flag to the antenna, and And transmitting, by the antenna, as the radio frequency output signal; the current transformer unit includes: a first current comparator electrically connected to the rectifying unit, and according to the corresponding second driving power transmitted by the second power line, Generating the sensing signal and outputting the sensing signal to the rectifying unit; and a second current comparator electrically connecting the current sampling unit and sensing the second driving power transmitted by the corresponding second power line, The sensing signal is generated, and the sensing signal is output to the current sampling unit. The power monitoring system of claim 1, wherein, in each current sensing module, when the current value of the rectified current is less than the predetermined current value, the power management chip stores the amount of power according to the super capacitor. The power is supplied to the current sampling unit and the RF transceiver chip. The power monitoring system of claim 1, wherein each current sensing module further includes an indicator light electrically connected to the radio frequency transceiver chip, wherein the current value of the corresponding second driving power is greater than At the critical current value, the RF transceiver chip also generates a driving signal and outputs the driving signal to the indicator light, so that the indicator light is illuminated according to the driving signal. The power monitoring system of claim 1, wherein the monitoring main station comprises: a first communication unit, and receiving the fault information transmitted by the antenna of each current sensing module with a determination result of yes And the series The RF output signal of the information, and generating a first communication signal according to the RF output signals, the first communication signal carrying the RF output signals; a base station receiving and outputting the first communication signal; a communication unit electrically connected to the base station to receive the first communication signal, and generating a second communication signal according to the first communication signal, the second communication signal having the fault information corresponding to each RF output signal and the a number information; and a geographic map host, storing a geographic map information, and receiving the second communication signal, and determining that the corresponding indication has occurred according to the geographic map information and each number information in the second communication signal The current sensing module has a geographic location, and correspondingly displays the fault information, the number information, and the geographic location of the current sensing module indicating an overcurrent to facilitate monitoring. The power monitoring system of claim 4, wherein: the geographic map host further generates a control signal and transmits the control signal to the second communication unit, and the second communication unit further generates the control signal according to the control signal a control output, the control output is transmitted to the first communication unit via the base station, the first communication unit generates and transmits a radio frequency control signal according to the control output; and the antennas of the K current sensing modules A corresponding one of the antennas receives the radio frequency control signal from the first communication unit, and the radio frequency transceiver chip corresponding to the corresponding one of the antennas receives the radio frequency control signal when the corresponding antenna receives the radio frequency control signal. Corresponding to the second power line The previously transmitted information of the current value of the second driving power is transmitted to the geographic map host via the corresponding antenna, the first communication unit, the base station, and the second communication unit. A current sensing module is applicable to a branch line device including a second power line for transmitting a second driving power, the current sensing module comprising: a current divider unit, according to the first The second driving power transmitted by the second power line generates a sensing signal related to the second driving power, and senses the second driving power transmitted by the second power line to generate a sensing signal, the sensing The signal indicates a current value of the second driving power currently transmitted by the second power line; a rectifying unit electrically connecting the current transformer unit to receive the sensing signal, and generating a rectified current according to the sensing signal; a super capacitor a power management chip electrically connected between the rectifying unit and the super capacitor, receiving the rectified current from the rectifying unit, and when a current value of the rectified current is greater than or equal to a predetermined current value, the power management chip is The rectified current supplies a power source and outputs the power source to the super capacitor, so that the super capacitor is charged according to the power source; a current sampling sheet And electrically connecting the power management chip and the current divider unit to respectively receive the power source and the sensing signal, and generate an analog sensing signal according to the sensing signal, wherein the current magnitude of the analog sensing signal follows the second a current change in driving power; an antenna for transmitting an RF output signal; and An RF transceiver chip electrically connecting the antenna and electrically connecting the power management chip and the current sampling unit to respectively receive the power source and the analog sensing signal, and converting the analog sensing signal into a digital sensing signal, and The digital sensing signal is sampled and calculated to obtain a current value of the second driving power, and it is determined whether the current value of the second driving power is greater than a critical current value. When the determination result is yes, the radio frequency transmitting and receiving chip Generating a fault flag and transmitting the fault flag to the antenna, and the antenna is transmitted and used as the RF output signal, the fault flag includes a fault information for indicating an overcurrent and an indication Corresponding one of the current sensing modules corresponds to the number information of the identification code; the comparator unit includes: a first current comparator electrically connected to the rectifying unit, and generating the sensing signal according to the second driving power, and Outputting the sensing signal to the rectifying unit; and a second current comparator electrically connecting the current sampling unit and sensing the second driving power to generate the sensing signal , And outputs the sensing signal to the current sampling unit. The current sensing module of claim 6, wherein: when the current value of the rectified current is less than the predetermined current value, the power management chip supplies the power to the current sampling according to the amount of power stored by the super capacitor. The unit and the RF transceiver chip; and the current sensing module further includes an indicator light electrically connected to the RF transceiver chip. When the current value of the second driving power is greater than the critical current value, the RF transceiver chip is further generated. a drive signal and the drive signal Output to this indicator so that the indicator lights up according to the drive signal.