CN208797560U - Overcurrent and phase shortage the broken string TT&C system of electric car charging circuit - Google Patents

Abstract

The utility model discloses the overcurrent and phase shortage broken string TT&C system of a kind of electric car charging circuit, the system includes measure and control device and mechanical fling-cut switch, measure and control device detects the switch input signal of mechanical fling-cut switch, measure and control device includes main control chip, current sampling circuit, current potential is lifted circuit, observation circuit unit, temperature-humidity monitoring unit, dual amplification circuit is connected between main control chip and current sampling circuit, the amplified current sampling signal of dual amplification circuit output signal is to main control chip, the temperature-humidity signal of main control chip detection temperature-humidity monitoring unit, main control chip is lifted circuit with current potential respectively, the electrical connection of observation circuit unit, main control chip exports control instruction signal to mechanical fling-cut switch.The TT&C system of the utility model can be by route overcurrent protection, phase shortage or because broken string phase shortage decompression carries out reasonable mechanism of control to charging pile supplying power for input end.

Description

Overcurrent and phase shortage the broken string TT&C system of electric car charging circuit

[technical field]

The utility model relates to TT&C system technical fields of powering, more particularly, to a kind of mistake of electric car charging circuit Stream and phase shortage broken string TT&C system.

[background technique]

With the development that charging pile is built, the chance of Rechargeable vehicle application charging pile can be more and more frequent, and then to charging The intelligence of stake power supply quality and power supply safety proposes high request, in recent years, the on-line monitoring as intelligent a part System also has become one of the research hotspot in industry, so the measure and control device of route overcurrent cutting load etc has had Mature technology, but the measure and control device substantially belongs to professional measure and control device, corresponding overcurrent classification it is more apparent and It is powerful, so directly form a kind of high-end device in other words due to the technical reason of its ontology create it is high-cost Investment, is directly applied to that charging pile power supply system is obviously based on cost and technical application is improper, is even currently answered Phase-lacking protective device system used in mains system is independent again, and is mostly the device based on motor applications.

Simultaneously as current overwhelming majority charging pile is powered using three phase mains namely 380V AC power source, when it In phase power supply when there is unpredictable missing, it is more likely that pole is formed to the charging pile built-in electronic equipment that is currently running Large impact, it is serious to will cause the damage of equipment unrepairable, so, power supply overcurrent protection and three-phase for charging pile application Power supply power supply should be monitored accordingly, be lacked once line current occurs more than the power supply that agreement threshold value either " needs a fourth for poker " It, should be in time by corresponding electric power incoming line mechanical switch when phase or three-phase power line have one of them line interruption Protectiveness operation is executed, load fault is disconnected.

However, there are also mature technologies for corresponding route overflow means, but there is no one kind can give electricity simultaneously Source phase shortage or disconnection fault monitoring cut off faulty equipment from system, keep scope of power outage as small as possible, to maintain to perfect part The matched low-cost system device of the normal operation of charging pile, suitable open air charging pile.

[utility model content]

For overcome the deficiencies in the prior art, the purpose of this utility model is to provide a kind of electric car charging circuits Overcurrent and phase shortage broken string TT&C system, the TT&C system is to determine electric car charging input line overcurrent and city The open phases of three-phase power source or disconnection fault of electric network, and then protection to subsequent equipment may be implemented, under power supply trouble situation Mechanical switch driving is isolated to lock with unauthorized mechanically actuated.

To solve the above problems, technical solution used by the utility model is as follows:

Overcurrent and phase shortage the broken string TT&C system of electric car charging circuit comprising measure and control device and mechanical switching are opened Close, measure and control device detects the switch input signal of mechanical fling-cut switch, wherein switch input signal include supply voltage signal with And switching current signal；Measure and control device includes main control chip, current sampling circuit, current potential lifting circuit, observation circuit unit, temperature Humidity-monitoring unit is connected with dual amplification circuit, dual amplification circuit output letter between main control chip and current sampling circuit Number amplified current sampling signal to main control chip, main control chip detects the temperature-humidity signal of temperature-humidity monitoring unit, master control Chip is electrically connected with current potential lifting circuit, observation circuit unit respectively, and main control chip exports control instruction signal to mechanical switching Switch, wherein main control chip is double-core single-chip microcontroller.

It can be seen that the main control chip of the measure and control device in TT&C system provided by the utility model uses double-core single-chip microcontroller As master control core, the supply voltage by monitoring permanent way machine fling-cut switch front end is used as key with by the electric current of the switch Signal input, by the analytical judgment of in house software, output meets theoretical logic and the control of actual demand instructs, can be direct Disconnect Current mechanical power supply line, it is necessary to when, forced blocking instruction will be exported to monitored device, can pass through route overcurrent Protection, phase shortage carry out reasonable mechanism of control to charging pile supplying power for input end because breaking phase shortage decompression.

It is supervised so largely can directly solve intelligent management and failure far from regular distribution supervision place Control, the operation and maintenance for charging pile at a specified future date provide beneficial technical support.Particularly, to realize no supervision region outdoors In section under multipurpose, limited quantity charging pile remote supervisory control, and be the charging pile in the case of non-equipment fault Using block signal, charging pile operation management cost can be directly reduced.

Further embodiment is that observation circuit unit includes switch monitors unit, mechanical trip monitoring unit, line voltage distribution Monitoring unit, main control chip are electrically connected with switch monitors unit, mechanical trip monitoring unit, line voltage distribution monitoring unit respectively.

As it can be seen that line voltage distribution monitoring unit can monitor the voltage condition of route front end；Switch monitors unit can monitor The switching location status of Current mechanical switch；Mechanical trip monitoring unit can monitor mechanical switch movement when mechanical path be It is no to meet.

Further embodiment is that three-phase current conditioning unit is also connected between main control chip and current sampling circuit.

As it can be seen that on the basis of conventional current sampling circuit, also increasing for the overcurrent monitoring function of measure and control device Three-phase current waveform strip conditioning unit is added, it can accurate sample rate current size can also reduce total system and handle, divide Low technical cost when sampled data is analysed, and can satisfy and mating be adapted to charging pile application.

Further scheme is that dual amplification circuit includes first input end, the second input terminal, the first operational amplifier And second operational amplifier, first input end are electrically connected with the first end of the first operational amplifier, the second input terminal and second The first end of operational amplifier is electrically connected.

Sampled data progress corresponding " multiple " and the data of " precision " are put as it can be seen that dual amplification circuit can be realized Greatly, the multiple of " overcurrent " permission can be met to meet this system measure and control device, while meets the substantially smart of data sampling measurement again Technical requirements are spent, can solve single channel A/D converter in main control chip can not meet sampling multiple and sampling precision simultaneously It is required that.

Further embodiment is, current potential lifting circuit includes third operational amplifier, transistor, third operational amplifier First end is electrically connected with the base stage of transistor.

As it can be seen that current potential lifting circuit is that zero potential is lifted circuit, the A/D converter that can solve built in main control chip cannot The problem of " negative value " of direct Sample AC waveform.

Further embodiment is that measure and control device further includes display panel module and input keyboard module, main control chip output Display panel module is displayed signal to, main control chip receives the input push button signalling of input keyboard module output.

As it can be seen that being provided with corresponding alternating interface between man and computer LCD and control threshold under reasonable electronic circuit principle and structure Value setting input keyboard module, the movement output function of manual simulation's failure triggering is provided with for corresponding keyboard entry function, I.e. in no extraneous false trigger signals, respective operations are realized by alternating interface between man and computer, in order to daily on-the-spot make an inspection tour with The accuracy of peripheral function circuit can be corresponded to when periodic inspection by the functional check.

Further embodiment is, measure and control device further includes firewall locking output unit, firewall be latched output unit with Main control chip electrical connection.

As it can be seen that the needs based on charging pile outdoor application, are latched output unit mainly for effective electricity by firewall When phase shortage occurs in source inlet wire, instruct i.e. cutting power supply outer moving back throwing to the output of the same level permanent way machine fling-cut switch, again by people Work output closes either remote mode and executes power transmission operation, mechanicalness forced blocking is carried out to current switch, until this observing and controlling Device releases in due course after receiving correct voltage sample data.

Further embodiment is that measure and control device further includes alarm output unit, and main control chip exports sound and light alarm signal extremely Alarm output unit.

As it can be seen that the alarm output unit is acousto-optic warning unit, alarm unit is prompted by the way that independent acoustic-optical fault is arranged, User malfunction information can be effectively prompted by sound and light alarm signal.

Further embodiment is that measure and control device further includes communication module, and main control chip is electrically connected with communication module.

As it can be seen that by being provided with the communication module based on Modbus communications protocol, to ensure TT&C system energy and charging pile The good fusion of management system manages.

Further embodiment is that measure and control device further includes real time clock unit, and real time clock unit is electrically connected with main control chip It connects.

As it can be seen that it is real-time to increase a kind of dedicated timing of independent DS1302 on the basis of single-chip microcontroller exclusive timekeeping system Clock unit, to ensure the real-time of TT&C system.

[Detailed description of the invention]

Fig. 1 is the overcurrent of the utility model electric car charging circuit and the principle of phase shortage broken string TT&C system embodiment Figure.

Fig. 2 is that the overcurrent of the utility model electric car charging circuit is put with dual in phase shortage broken string TT&C system embodiment The circuit diagram of big circuit.

Fig. 3 is that current potential is lifted in the overcurrent and phase shortage broken string TT&C system embodiment of the utility model electric car charging circuit Rise the circuit diagram of circuit.

[specific embodiment]

In order to which the objects, technical solutions and advantages of utility model are more clearly understood, with reference to the accompanying drawings and embodiments, The present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain this Utility model, and it is not exclusively for the utility model.

Referring to Fig. 1, overcurrent and phase shortage the broken string TT&C system of the electric car charging circuit of the utility model include observing and controlling Device 1, mechanical fling-cut switch 2 and power module (not shown), measure and control device 1 detect the switch input of mechanical fling-cut switch 2 Signal, power module can provide 3.3V, 5.0V and 12V supply voltage for measure and control device 1, wherein switch input signal includes Supply voltage signal and switching current signal.

Measure and control device 1 includes main control chip 10, current sampling circuit 20, current potential lifting circuit (not shown), observation circuit Unit, temperature-humidity monitoring unit 30, are connected with dual amplification circuit between main control chip 10 and current sampling circuit 20 and (do not show Out), the amplified current sampling signal of dual amplification circuit output signal to main control chip 10, main control chip 10 detects temperature and humidity The temperature-humidity signal of monitoring unit 30, main control chip 10 are electrically connected with current potential lifting circuit, observation circuit unit respectively, master control core Piece 10 exports control instruction signal to mechanical fling-cut switch 2, wherein main control chip 10 is double-core single-chip microcontroller, and in this implementation Main control chip 10 takes full advantage of the built-in A/D converter of double-core single-chip microcontroller in example.

Specifically, the TT&C system of the utility model is built using double-core single-chip microcontroller as core component, is realized A kind of route overcurrent protection and phase shortage or because broken string phase shortage decompression carries out reasonable mechanism of control to charging pile supplying power for input end, For measure and control device 1 using double-core single-chip microcontroller as core, each functional unit is that auxiliary circuit has set up suitable inexpensive charging pile application System.In the present embodiment, TT&C system is by monitoring the supply voltage of permanent way machine fling-cut switch front end and passing through the switch Electric current inputted as key signal, by the analytical judgment of main control chip 10, output meets theoretical logic and actual demand Control instruction；Current mechanical power supply line can directly be disconnected, it is necessary to when, forced blocking can be exported to monitored device and referred to It enables.

Observation circuit unit includes switch monitors unit 40, mechanical trip monitoring unit 50, line voltage distribution monitoring unit 60, Main control chip 10 is electrically connected with switch monitors unit 40, mechanical trip monitoring unit 50, line voltage distribution monitoring unit 60 respectively.Its In, line voltage distribution monitoring unit 60 can monitor the voltage condition of route front end；Switch monitors unit 40 can monitor current machine The switching location status of tool fling-cut switch 2；Mechanical trip monitoring unit 50 can monitor the machinery when movement of mechanical fling-cut switch Whether path the parameters such as meets.

Three-phase current conditioning unit 70 is also connected between main control chip 10 and current sampling circuit 20.Wherein, for surveying For the overcurrent monitoring function of controlling device 1, on the basis of conventional current sampling circuit 20, three-phase current waveform is also added Conditioning unit, it can it is low in processing, analytical sampling data can also to reduce total system for accurate sample rate current size Technical costs, and can satisfy and mating be adapted to charging pile application.

Referring to fig. 2, dual amplification circuit includes first input end VS1, the second input terminal VS2, operational amplifier U1, operation Amplifier U2, diode VD1, diode VD2, resistance R6, resistance R7, resistance R8, resistance R9, first input end VS1 and operation The first end of amplifier U1 is electrically connected, and the second input terminal VS2 is electrically connected with the first end of operational amplifier U2.As it can be seen that dual put Big circuit can be realized the data for carrying out corresponding " multiple " and " precision " to sampled data and amplify, to meet 1 energy of measure and control device Meet the multiple of " overcurrent " permission, while meeting the basic accuracy technical requirements of data sampling measurement again, can solve master control core Single channel A/D converter can not meet the requirement of sampling multiple and sampling precision simultaneously in piece 10.

In the present embodiment, in order to cooperate phase shortage decompression to forbid operational management demand, using electric current with the voltage side of combining Formula come determine phase shortage break, simultaneously as main circuit current be variation, it is clear that amplitude size cannot function as sentencing for open phase fault According to judge to be different from route over current fault, this TT&C system is using statistics " sampled value of non-faulting phase, which is added, is equal to 1024 " The method of number differentiates open phase fault or disconnection fault, i.e., (sampling period in the X sampling period after the failure occurred It is set as 1.5ms), such as 4 times, after being added the number equal to 1024 more than the 2/3 of total degree if there is two sampled values, then It is determined as open phase fault, is otherwise disconnection fault.Certainly, main control chip 10 does not do output respective tube if not in starting threshold value Control action command.

Specifically, phase shortage disconnection fault process flow includes: TT&C system judges whether non-over current fault statistics number is full Foot 4 times, if the determination result is YES, then removes Reflector, and return to previous assignment instructions；If judging result be it is no, Judge whether sampled value is less than preset threshold value, if so, then statistic registers add 1, and returns to previous assignment instructions；If not Be, then statistic registers reset, then, exported according to threshold determination, and judge switch move back throw it is whether eligible, if so, Then record and output order.Wherein, in system default 1.5ms 4 times both greater than sample value ratio k=0.433 when export, system is sentenced Delay 5s eliminates the current spikes erroneous judgement that interference may cause after fixed.

In this way, in specific application, based on the bigger basic principle of the more big then sampled value of fault current, in failure Under state, lesser current sampling data is obtained by first input end Vs1, and biggish current sampling data passes through the second input terminal Vs2 is obtained.Obviously, the application of dual amplification circuit directly solves single channel A/D converter can not meet sampling times simultaneously Several and sampling precision requirement, avoiding traditional conventional techniques is realized by the way that external multi-channel a/d converter is arranged The case where.

Referring to Fig. 3, it includes operational amplifier U3, transistor VT, resistance R1, resistance R2, resistance R3, electricity that current potential, which is lifted circuit, Hinder R4, the end resistance R5, VerH, the end VerL, the end Vcc, the end VRL, the first end of operational amplifier U3 and the base stage electricity of transistor VT Connection.Wherein, the end VerH, the end VerL are sampled signal input, and the end Vcc, the end VRL are lifting signal output end, current potential lifting Circuit is that zero potential is lifted circuit, and can solve A/D converter built in main control chip 10 cannot direct Sample AC waveform The problem of " negative value ", replaces absolute value circuit and symbolic circuit by the way of raising reference voltage, realizes that AC signal is negative The sampling of value.When the circuit runs, conventional reference voltage has been elevated one times, i.e., is based on the waves AC of zero point (such as 0V) originally Shape is now by artificial (such as 2.5V) after raising certain benchmark, and the waveform of part is also just raised to therewith below zero point The former above position of zero point can directly be sampled by main control chip 10 and receive (such as 0-5V).For example, when sampled voltage is common It when 2.5V, directly raises its " zero point ", sampled voltage becomes 5.0V, and then realizes that 2.5V or less is all the simulation of " negative value ", complete The waveform sampling processing of pairs of sinusoidal ac, avoiding traditional conventional techniques is by the way that external multichannel A/D is arranged The case where circuit is realized, reduces the technical costs and circuit complexity of measure and control device 1.

In the present embodiment, measure and control device 1 further includes display panel module 11 and 12 pieces of input keyboard mould, main control chip 10 Output displays signal to display panel module 11, and main control chip 10 receives the input push button signalling that input keyboard module 12 exports.Its In, display panel module 11 is that LCD display is provided with alternating interface between man and computer under reasonable electronic circuit principle and structure The input keyboard module 12 of LCD display and control threshold setting is provided with manual simulation's event for corresponding keyboard entry function Hinder the movement output function of triggering, i.e., in no extraneous false trigger signals, respective operations realized by alternating interface between man and computer, In order to daily on-the-spot make an inspection tour with can pass through the accuracy of the corresponding peripheral function circuit of the functional check when periodic inspection.

Preferably, measure and control device 1 further includes firewall locking output unit 13, and firewall is latched output unit 13 and master control Chip 10 is electrically connected.As it can be seen that the needs based on charging pile outdoor application, output unit 13 is latched mainly for having by firewall When phase shortage occurs in the electric power incoming line of effect, instruct i.e. cutting power supply outer moving back throwing to the output of the same level permanent way machine fling-cut switch 2, again Either remote mode execution power transmission operation is closed by manually exporting, mechanicalness forced blocking is carried out to current switch, until Measure and control device 1 releases in due course after receiving correct voltage sample data.

Preferably, measure and control device 1 further includes alarm output unit 14, and main control chip 10 exports sound and light alarm signal to alarm Output unit 14.As it can be seen that alarm output unit 14 is acousto-optic warning unit, it is single by the way that independent acoustic-optical fault prompt alarm is arranged Member can effectively prompt user malfunction information by sound and light alarm signal.

Preferably, measure and control device 1 further includes communication module 15, and main control chip 10 is electrically connected with communication module 15.As it can be seen that logical It crosses and is provided with the communication module 15 based on Modbus communications protocol, to ensure that TT&C system can be good with charging pile management system Fusion management.

Preferably, measure and control device 1 further includes real time clock unit 16, and real time clock unit 16 is electrically connected with main control chip 10 It connects.As it can be seen that increasing a kind of dedicated timing real-time clock list of independent DS1302 on the basis of single-chip microcontroller exclusive timekeeping system Member 16, to ensure the real-time of TT&C system.

In the present embodiment, measure and control device 1 uses double-core single-chip microcontroller as master control core, meanwhile, to ensure this technology side Measure and control device system under case can handle these " tasks " simultaneously, in due course, which uses the embedded reality of μ C/OS-II When master control scheme of the operating system as software, make full use of its effective time-constrain, predictability, reliability and external The interactive of environment realizes the acquisition of intelligent electric parametric data, analysis and judgement, completes in conjunction with corresponding management threshold value more Kind task status management exchanges processing with instruction output, communication information.By classifying rationally to task and priority distribution, mention The high stability of system, reliability and maintainability.

Certainly, " task " signified in the present embodiment refers to a process in embedded system, has dormant state, ready State, run mode, pending state, waiting state, ending state.

So normally, simultaneously carrying out to coordinate all TT&C tasks of TT&C system under the technical program, the present embodiment is mentioned Supplied a kind of system software scheduling flow, the process improved based on μ C/OS-II operating system countermeasure processing it is each independent but The functional task connected each other again.

Specifically, system software scheduling flow includes: operating system initialization, and then, creation task simultaneously divides priority, Then, start-up operation system, can be realized after start-up operation system self-test task, keyboard task, display output, at failure Reason, Communication processing, sampling task, Sampling interrupt etc. be each independent but the functional task that connects each other.In this way, double-core single-chip microcontroller Core system can be become using multitask, each task is mutually indepedent and have can be in communication with each other by the way of complete paired transmission line Monitoring management.

In the present embodiment, overcurrent Yu phase shortage broken string the observing and controlling system of electric car charging circuit provided by the utility model System, the TT&C system may insure that the charging pile equipment as important load once occurs more than assumed load electric current or reaches When to assumed load threshold value or when input supply voltage is incomplete, directly excision, de- can be implemented to failure charging pile Offline road, feedback information, and can maintain under consolidated network state other charge normal stake and continue to provide effectively charging clothes Business.

When there is irreversible transition load faulty, TT&C system also exports specific control instruction and closes isolation input, And when being determined as non-equipment fault but front end power phase shortage, it will implement to carry out enclosed type to route input mechanical switch Permission control, until unlocking after permission is obtained, it can be to avoid the abnormal running of normal device, in certain reasonable cost model It encloses interior outdoor charging pile supply input path monitoring and the Fault Isolation operation sequence of can improving to control, to improve charge user Overall applicability experience.

It can be seen that the main control chip 10 of the measure and control device 1 in TT&C system provided by the utility model uses double-core list Piece machine as master control core, make with by the electric current of the switch by the supply voltage by monitoring 2 front end of permanent way machine fling-cut switch For key signal input, by the analytical judgment of in house software, output meets theoretical logic and the control of actual demand instructs, can Directly to disconnect Current mechanical power supply line, it is necessary to when, forced blocking instruction will be exported to monitored device, it can be to route Overcurrent protection and phase shortage carry out reasonable mechanism of control to charging pile supplying power for input end because breaking phase shortage decompression.Therefore, very Intelligent management and failure monitoring far from regular distribution supervision place can be solved in big degree, directly for charging pile at a specified future date Operation and maintenance provide beneficial technical support.Particularly, for realize multipurpose in the section outdoors in no supervision region, The remote supervisory control of charging pile under limited quantity, and be the charging pile application block signal in the case of non-equipment fault, can be with Directly reduce charging pile operation management cost.

It should be noted that the above is only the preferred embodiment of the utility model, but the design concept of utility model is not It is confined to this, it is all to conceive the insubstantial modifications made to the utility model using this, also each fall within the protection of the utility model Within the scope of.

Claims (10)

1. The TT&C system 1. overcurrent of electric car charging circuit and phase shortage break characterized by comprising

   Measure and control device and mechanical fling-cut switch, the measure and control device detect the switch input signal of the mechanical fling-cut switch, Wherein, the switch input signal includes supply voltage signal and switching current signal；

   The measure and control device includes main control chip, current sampling circuit, current potential lifting circuit, observation circuit unit, temperature and humidity prison Unit is surveyed, dual amplification circuit, the dual amplification circuit are connected between the main control chip and the current sampling circuit The amplified current sampling signal of output signal to the main control chip, the main control chip detects the temperature-humidity monitoring unit Temperature-humidity signal, the main control chip is electrically connected with the current potential lifting circuit, the observation circuit unit respectively, the master It controls chip and exports control instruction signal to the mechanical fling-cut switch, wherein the main control chip is double-core single-chip microcontroller.
2. The TT&C system 2. overcurrent of electric car charging circuit according to claim 1 and phase shortage break, it is characterised in that:

   The observation circuit unit includes switch monitors unit, mechanical trip monitoring unit, line voltage distribution monitoring unit, the master Control chip is electrically connected with the switch monitors unit, the mechanical trip monitoring unit, the line voltage distribution monitoring unit respectively.
3. The TT&C system 3. overcurrent of electric car charging circuit according to claim 2 and phase shortage break, it is characterised in that:

   Three-phase current conditioning unit is also connected between the main control chip and the current sampling circuit.
4. The TT&C system 4. overcurrent of electric car charging circuit according to claim 1 and phase shortage break, it is characterised in that:

   The dual amplification circuit includes first input end, the second input terminal, the first operational amplifier and the second operation amplifier Device, the first input end are electrically connected with the first end of first operational amplifier, second input terminal and described second The first end of operational amplifier is electrically connected.
5. The TT&C system 5. overcurrent of electric car charging circuit according to claim 4 and phase shortage break, it is characterised in that:

   Current potential lifting circuit includes third operational amplifier, transistor, the first end of the third operational amplifier and institute State the base stage electrical connection of transistor.
6. The TT&C system 6. overcurrent of electric car charging circuit according to any one of claims 1 to 5 and phase shortage break, It is characterized in that:

   The measure and control device further includes display panel module and input keyboard module, and the main control chip output displays signal to institute Display panel module is stated, the main control chip receives the input push button signalling of the input keyboard module output.
7. The TT&C system 7. overcurrent of electric car charging circuit according to any one of claims 1 to 5 and phase shortage break, It is characterized in that:

   The measure and control device further includes firewall locking output unit, the firewall locking output unit and the main control chip Electrical connection.
8. The TT&C system 8. overcurrent of electric car charging circuit according to any one of claims 1 to 5 and phase shortage break, It is characterized in that:

   The measure and control device further includes alarm output unit, and the main control chip exports sound and light alarm signal to the warning output Unit.
9. The TT&C system 9. overcurrent of electric car charging circuit according to any one of claims 1 to 5 and phase shortage break, It is characterized in that:

   The measure and control device further includes communication module, and the main control chip is electrically connected with the communication module.
10. The TT&C system 10. overcurrent of electric car charging circuit according to any one of claims 1 to 5 and phase shortage break, It is characterized by:

    The measure and control device further includes real time clock unit, and the real time clock unit is electrically connected with the main control chip.