KR102564550B1 - Electric Vehicle Portable Function Box Integrated Charger and Driving Method Thereof - Google Patents

Abstract

The present invention relates to a portable function box integrated charger for an electric vehicle and a method for driving the charger. The voltage supply unit provided to the charging port through the charging connector connected to the charging port of the electric vehicle, the sensor unit detecting the voltage and current of the commercial power supplied to the charging port, and the switching element that operates on and off according to the state of the detected voltage and current It may include a switching unit, and a control unit that adjusts the on/off degree of the switching element according to a user command for selecting the sensing values of the detected voltage and current and the current range of the commercial power supply.

Description

Electric vehicle portable function box integrated charger and driving method of the charger {Electric Vehicle Portable Function Box Integrated Charger and Driving Method Thereof}

The present invention relates to an electric car portable function box integrated charger and a driving method of the charger, and more particularly, to an emergency electric car portable function box integrated charger that can be used temporarily in a situation where charging is urgently needed and a driving method of the charger will be.

In general, an electric vehicle is driven by using electricity as an energy source, and since the electric vehicle has the advantage of not emitting exhaust gas at all, the frequency of use of the electric vehicle is gradually increasing. The use of electric vehicles is also encouraged according to each country's policy to reduce environmental pollution. Despite these advantages, the reason why the penetration rate of electric vehicles is low is because they cannot conveniently charge electricity, which is an energy source of electric vehicles.

Above all, in the midst of the global expansion of electric vehicles by carbon-neutral policy, the establishment of an electric vehicle charger infrastructure is urgently required. Therefore, instead of visiting and charging the fixed chargers of existing manufacturers, it is a device that can be charged for emergency purposes in places where there are no chargers and in public houses and offices equipped with charging outlets in parking lots, and to diagnose the convenience and abnormalities of users. , a charger that includes a device that notifies the user of the automatic cut-off function when the voltage and current are ± or less than the specified voltage and current values is an emergency charger.

However, in the case of existing fixed chargers or emergency chargers, it is cumbersome to individually visit the installation location.

Korean Registered Patent Publication No. 10-1793330 (2017.10.27) Korean Registered Patent Publication No. 10-2117907 (May 27, 2020) Korean Patent Publication No. 10-2018-0058447 (2018.06.01) Korean Patent Publication No. 20-2021-0001827 (2021.08.12) Korean Patent Publication No. 20-2021-0000504 (2021.03.04)

An object of the present invention is to provide an emergency electric vehicle portable function box integrated charger and a driving method of the charger that can be used temporarily in a situation where charging is urgently needed.

An electric vehicle portable (functional box integrated) charger according to an embodiment of the present invention is a portable electric vehicle charger that is portablely equipped in an electric vehicle, and supplies external commercial power to the charging inlet through a charging connector connected to the charging inlet of the electric vehicle. A voltage supply unit, a sensor unit that detects the voltage and current of the commercial power supplied to the charging port, a switching unit including a switching element that is turned on and off according to the state of the detected voltage and current, and the detected voltage and current. and a control unit that adjusts the on/off degree of the switching element according to a current sensing value and a user command for selecting a current range of the commercial power supply.

The electric vehicle portable charger may further include a display for displaying the sensed voltage and current detection results on a screen under the control of the control unit and receiving a user command for selecting the current range.

When the user command is received through the display, the control unit may adjust the on/off degree by varying a bias voltage applied to the switch element based on the received user command.

The control unit may turn off the switching element in the turned-on state when leakage current is sensed based on a detection result of the sensor unit.

The voltage supply unit is composed of first to third power lines, supplies the commercial power to the first and second power lines, and may use the third power line as a ground line.

The sensor unit may include a voltage sensor connected to the first power line and the second power line to sense a voltage of the commercial power supply, and a leakage current connected to the first power line and the second power line to sense a leakage current. A sensor, and a current sensor connected to the first power line or the second line to sense the current of the commercial power supply.

The control unit may check whether the charging connector is connected to the charging port by using a pilot signal.

In addition, a driving method of an electric vehicle portable (functional box integrated) charger according to an embodiment of the present invention is a driving method of a portable electric vehicle charger equipped in an electric vehicle, and the voltage supply unit supplies external commercial power to the charging port of the electric vehicle. Providing to the charging port through a connected charging connector, detecting, by the sensor unit, the voltage and current of the commercial power supplied to the charging port, by the switching unit including a switching element, in a state of the sensed voltage and current and controlling, by a controller, an on/off degree of the switching element according to a user command for selecting the sensed voltage and current values and a current range of the commercial power supply.

According to an embodiment of the present invention, a 220V dedicated portable charger that can be charged in an emergency and portable manner when a charger is not available in a situation where the establishment of an electric vehicle charger infrastructure is insufficient, rather than a method of individually visiting and charging a fixed electric vehicle charger installation location As a result, convenience can be provided to users, and prevention of electric shock accidents caused by leakage of electricity and maintenance can be managed in an integrated manner.

In addition, the embodiment of the present invention has excellent convenience as LED and LCD screens are installed outside the charger considering usability, and an integrated function box compared to existing products with operating buttons in an environment where the electric car charger communication protocol (OCPP) can be applied and services can be expanded. Convenient to use as a charger.

Furthermore, embodiments of the present invention can be used to increase charger efficiency by providing a charge amount that can go to an electric vehicle charging station early in a situation where it is difficult to charge in an emergency.

1 and 2 are diagrams showing an electric vehicle charging system according to an embodiment of the present invention;
3 is a view showing a display of the electric car portable charger of FIGS. 1 and 2;
4 is a block diagram illustrating the detailed configuration of the electric car portable charger of FIGS. 1 and 2;
5 is a circuit diagram of the block diagram of FIG. 4;
6 is a view showing the connection between the charging connector and the electric vehicle inlet of FIG. 5, and
7 is a flowchart illustrating a driving process of a portable charger for an electric vehicle according to an embodiment of the present invention.

Embodiments of the present invention may be modified in various forms, and the scope of the present invention is not limited to the embodiments described below. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Therefore, the shape and size of elements in the drawings may be exaggerated for clearer explanation, and elements indicated by the same reference numerals in the drawings are the same elements.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 are diagrams illustrating an electric vehicle charging system according to an embodiment of the present invention, and FIG. 3 is a diagram showing a display of the electric vehicle portable charger of FIGS. 1 and 2 .

As shown in FIG. 1, the electric vehicle charging system 90 according to an embodiment of the present invention includes an electric vehicle 100 (or an electric vehicle inlet 101), an electric vehicle portable (functional box integrated) charger 110 and a part or all of the commercial power supply unit 120, and may further include a billing device for billing the amount of power used in the commercial power supply unit 120.

Here, "including some or all" means that the electric vehicle charging system 90 is configured by omitting some components such as the commercial power supply unit 120, or the power supply unit is in the form of a battery in the electric vehicle portable charger 110. It means that it can be integrated into and configured, and will be described as including all in order to help a sufficient understanding of the invention.

In the case of the electric vehicle 100, a charging port 101 for charging electricity is included. The charging port 101 of the electric vehicle 100 is also called a charging socket or an inlet. The specifications of the charging port 101 manufactured by each manufacturer of the electric vehicle 100 may vary, and standards may be set and manufactured in terms of the mechanism forming the outer edge of the charging port 101, but the charging voltage or current standardization may not be possible. For example, the charging inlet 101 may be of various types such as universal GB/T and combined charging system (CCS) charging inlets for AC and DC charging of electric vehicles using charging power (high output charging) of up to 500 kW.

The specifications of the charging port 101 according to the embodiment of the present invention are preferably manufactured to correspond to the charging connector of the electric vehicle portable charger 110. This will be discussed further in FIG. 6 later. In other words, the charging port 101 is configured in the charging connector so that the first power line and the second power line receiving commercial power can be connected to each other, and the third power line is the charging port of the electric vehicle 100 ( 101) and the charging connector are preferably configured to be grounded to each other.

An electric vehicle portable charger 110 according to an embodiment of the present invention is an emergency electric vehicle charger that can be used temporarily in a situation in which urgent charging is required as a control box-integrated portable charger exclusively for 220V electric vehicles. Due to the recognition that it may be difficult to charge an electric vehicle in a reality where the driving distance after fully charging is not yet sufficient or the charging infrastructure is insufficient, it can be prepared as a portable vehicle in an emergency situation. In addition, in the electric vehicle portable charger 110, a sensor is used to detect malfunction of the charger due to leakage current, such as overcurrent and overvoltage, in advance. For example, with an input voltage of 220V, the user can select 13A to 16A and provides power of 2.5Kw to 3.5KW. It is a portable charger that can check the current and voltage status to protect against short circuit, overcurrent, undervoltage, and short circuit.

The electric car portable charger 110 is a 220V portable control box integrated charger that can use an electric car charger more practical and at a reasonable cost. It supports variable current of 2.5kW and 3.5Kw, so the charging cost is economical and can be carried at all times. As shown in (a) of FIG. 3 , since the user can select the current through the display 111a of the product, it can be seen that the power varies according to the change in the current selected by the user. Therefore, the electric vehicle portable charger 110 can also be used for emergency purposes when the existing stationary slow charger cannot be used immediately. In addition, it can be safely used in IP44 ~ 55 grade waterproof and dustproof performance and 220V outlet and charge type outlet. The electric vehicle portable charger 110 may be used in a voltage range of 220V/60Hz/16A, a power range of 2.5Kw to 3.5KW, and a current range of 13A to 16A. Cable dimensions can have a maximum length of 2m to 6m.

In addition, the electric vehicle portable charger 110 according to an embodiment of the present invention is a device having a built-in detector (eg, sensor) that provides voltage and current states in real time, and detects voltage on a display screen as shown in (a) of FIG. It includes a device that can judge abnormal signs of and current, select a current range with external notification, and monitor with LED and LCD. It is a portable emergency charging equipment that is different from the method using a fixed slow or rapid charger. The amount of charge is displayed on the display screen as shown in (a) of FIG. 3, and the current range can be adjusted as much as desired by selecting the (+) button or the (-) button.

The electric vehicle portable charger 110 has a built-in cable-integrated control and protection device (eg, switching element) for charging, includes control and safety functions, and uses a pilot signal to check whether the protective conductor is connected to the electric vehicle. It has a function to operate a circuit breaker (e.g. switching element) if the DC residual current exceeds 6mA to 10mA. A reference value of the DC residual current may be set, and an excess may be determined according to comparison with the reference value. The all-in-one control box charger performs the operations of detecting residual current (RC), comparing the residual current value and residual operating current value, and simultaneously opening the protection circuit when the residual current exceeds the operating current value. . That is, it can be seen that the integrated control box charger operates when the current value of the residual current is greater than the residual operating current value.

Externally, the electric vehicle portable charger 110, as shown in FIGS. 1 and 2, schematically includes a main body portion 111 of the product, a socket-outlet connection plug 115 of a fixed facility, and control and protection functions. It may include one or more assemblies, a cable 113 (1.5SQ 3C to 2.5SQ 3C) between the plug 115 and the subassembly, a vehicle connector for connection of an electric vehicle, and the like. And, as shown in (a) of FIG. 3, a display 111a is configured as a protruding part of one side of the portable charger 110 configured in the form of a gun, for example, to receive a user command and control is performed , a charging connector is configured on the opposite side and can be connected to the inlet, that is, the charging port of the electric vehicle. 1 to 3, the body portion 111 is configured in a gun shape or T-shape, and a circuit unit for operating the electric vehicle portable charger 110 may be configured inside, and a display 111a, Various additional configurations are made, such as a charging connector. The main body 111 may be made of various materials such as PVC, nylon, fiberglass, and die casting.

The voltage and current ratings of the cable assembly of the electric vehicle portable charger (1100) are compatible with the ratings of the electric vehicle power supply, and the cable assembly includes one or more cables 113 and may be a flexible tube, conduit, or wire. Cable 113 may be equipped with a metal shield connected to ground.

The billing device (not shown) may be able to communicate with the electric vehicle portable charger 110 through communication. For example, the electric vehicle portable charger 110 may be required to pay for the use of nearby commercial power sources in an emergency. Accordingly, in this case, an operation such as generating data related to power use and providing the data to the billing device may be performed. Or, since the system can be configured in various ways with respect to whether or not to pay for the used power, such as transmitting data stored inside when accessing a specific communication network such as Wi-Fi, in an embodiment of the present invention, any one The shape will not be particularly limited. For example, emergency charging may be performed through a commercial power source in a government office even though the user cannot go to a designated place for charging, or charging may be performed at an acquaintance's house. Therefore, in the case of public offices, expenses are settled, but in the case of acquaintances, expenses may not be settled. Therefore, since this determination may be made through the display 111a of the electric vehicle portable charger 110, the embodiment of the present invention will not be particularly limited to any one form.

4 is a block diagram showing the detailed configuration of the electric car portable charger of FIGS. 1 and 2, FIG. 5 is a circuit diagram of the block diagram of FIG. 4, and FIG. 6 shows the connection between the charging connector and the electric car inlet of FIG. it is a drawing

As shown in FIG. 4, the electric vehicle portable charger 110 according to an embodiment of the present invention, when looking at the driving mechanism, has a switch function unit 400, an RC function unit 410, and a control pilot inside the body unit 111. It includes some or all of the function unit 420 and the display 430, and may further include a user interface unit 435.

Here, the functional unit may be named a 'functional block', and "including some or all" means that some components such as the display 430 are omitted so that the electric vehicle portable charger 110 is configured or the control pilot function unit ( 420) means that it can be integrated with the RC function unit 410, and will be described as including all of them to help a sufficient understanding of the invention.

On the other hand, since the switch function unit 400, the RC function unit 410, the control pilot function unit 420, and the display 430 of FIG. 4 may be configured by hardware, software, or a combination thereof, the implementation of the present invention In the examples, it will not be particularly limited to any one form.

As can be seen in FIG. 5, the switching function unit 400 of FIG. 4 is configured in a power (supply) line to which commercial power is supplied. In other words, between the plug 115 supplying commercial power and the charging connector 440 of the electric vehicle, the power supply operation can be performed with three wires, and at this time, the two wires, that is, the first power line and the second power line The third power line, which is involved in supply, can be used for mutual grounding. In this case, the switching element of the switching function unit 400 may be configured in the first power line and the second power line. A relay device used for high voltage may be used as the switching device. Of course, various types of switching elements may be used, and above all, in the embodiment of the present invention, it is preferable to adjust the amount of current according to gate control of the switching element. To this end, a device operating on the same principle as an FET may be used, and in this case, a voltage applied to both ends of a gate and a source terminal may be varied according to a selection of a current range.

The RC function unit 410 may include a sensor unit. The sensor unit includes a voltage sensor 411 for sensing the voltage supplied through the first power line and the second power line, and a current sensor 413 for sensing the current through the first power line or the second power line, and the first power line. A leakage current sensor 415 for sensing leakage current through the power line and the second power line may be included. The BENVAC sensor jointly developed by Bendert and VAC is a good example of a leakage current sensor (415). Of course, since various types of products may be used for the voltage sensor 411, the current sensor 413, and the leakage current sensor 415, the embodiment of the present invention will not be particularly limited to any one configuration. However, in the embodiment of the present invention, current or voltage is sensed through a sensor, and leakage current is sensed. In particular, voltage or leakage current detection operates while connected to the first power line and the second power line, but the current sensor 410 operates while connected to the first power line or the second power line. As a result, aspects such as cost saving can be considered.

The control pilot function unit 420 may include a control unit 421 and a control pilot unit 423 as shown in FIG. 5 . The control unit 421 includes a control circuit such as a CPU or an MPU, and of course may further include a memory and the like in addition. The control pilot unit 423 may include and execute a program for performing an operation related to the pilot signal. For example, the control pilot unit 423 provides a pilot signal to the charging port 101 of the electric vehicle through the charging connector 440, and when there is a response signal thereto, the charging connector 440 is connected to the charging port 101. It can determine that it is connected and notify the CPU. In this process, the control pilot unit 423 may perform operations such as checking whether the protective conductor is connected to the electric vehicle using a pilot signal. For example, connection may be determined when a reflection signal is detected using a pilot signal.

When the control unit 420 such as a CPU determines that the electric vehicle portable charger 110 is connected to the charging port 101 of the electric vehicle through the pilot signal of the control pilot unit 423, sensing values received from various types of sensors are detected. can be analyzed. During this process, the control unit 420 turns off the switching element of the switching unit 400 when leakage current is detected and the user is concerned about electric shock, cuts off the supply of commercial power, and at the same time notifies the user of the charging operation to the outside. to stop In addition, the control unit 420 turns off the switching element of the switching unit 400 so that the corresponding current is supplied when the user adjusts the range of the current supplied through the user interface unit 435 such as a button. You can adjust the degree or degree of on (ON). That is, the control unit 420 may adjust the current range by controlling the gate of the switching element, more precisely by controlling the bias voltage applied between the gate and the source terminal. It is also possible to adjust the current range by adjusting the magnitude of the voltage. Since it is possible to adjust the current range in various forms, the embodiment of the present invention will not be particularly limited to any one form. Since power (P) = voltage (V) × current (I), when the current range is adjusted, the power range is adjusted.

The display 430 may be an LED panel including a plurality of LED elements. When the touch screen is integrally formed on the corresponding LED panel, it is also possible to receive a user command by a user's touch. Figure 3 (a) shows something related to this. A user command may be provided on the display 430 to designate a current range.

The user interface unit 435 may include a power button or various types of buttons displayed on the screen of the display 430 . Above all, since corresponding buttons perform an operation for receiving a user command, they may be configured in various forms to receive a user command. For example, in the case of receiving a user command by voice, the user interface unit 435 may include a voice receiver such as a microphone for acquiring the user's voice command.

Figure 6 shows the automotive coupler (b). When charging the electric vehicle, the vehicle connector (c) and the inlet (d) of the electric vehicle are coupled to each other. Therefore, if (a) represents the cable assembly of the electric car portable charger, (e) can be seen as the circuit of the car. AC supply (f) is made through the first power line and the second power line, and the third power line may be connected (g) to the vehicle chassis and grounded. (h) represents a proximity detection circuit, and S3 represents an auxiliary switch.

In addition to the above, the switch function unit 400, the RC function unit 410, the control pilot function unit 420, and the display 430 of FIG. 4 according to an embodiment of the present invention can perform various operations, Since other details have been sufficiently explained above, they will be replaced with those contents.

7 is a flowchart illustrating a driving process of a portable charger for an electric vehicle according to an embodiment of the present invention.

Referring to FIG. 7 together with FIGS. 4 and 5 for convenience of description, the voltage supply unit (or RC function unit) of the electric vehicle portable charger 110 according to an embodiment of the present invention supplies commercial power received from the outside through a charging connector. It is provided as a charging port for electric vehicles (S700). Here, the voltage supply unit may include a power supply line or the like.

In addition, the sensor unit (or RC function unit) of the electric vehicle portable charger 110 detects the voltage and current of commercial power supplied to the charging port (S710). Here, the voltage is a supply voltage, and the current may include a supply current and a leakage current. A leakage current sensor is used to detect leakage current.

The switching unit of the electric vehicle portable charger 110 operates on and off according to the state of the detected voltage and current (S720). When leakage current is detected and a user's electric shock is concerned, the supply of power to the switching unit may be cut off in order to cut off the supplied power. To this end, the switching element may be turned off. In addition, when the current range needs to be adjusted according to a user command, the switching unit can adjust the voltage or current supply state. Since this has been sufficiently explained above, we will replace it with the contents.

The control unit of the electric vehicle portable charger 110 controls the on/off state of the switching unit according to the user's user command for selecting the sensing value and current range of the detected voltage and current (S730). For example, when a current range is selected according to a user command, the control unit may control a turn-on state or a turn-off state of the switching element so that a corresponding current is provided. In other words, when there is a user command in the turn-on state of the switching element, the turn-off degree can be adjusted accordingly, and when the user command is provided in the turn-off state, the turn-on degree can be adjusted accordingly.

In addition to the above, the electric vehicle portable charger 110 of FIG. 1 can perform various operations, and since other details have been sufficiently described above, they will be replaced with those contents.

On the other hand, even if all the components constituting the embodiment of the present invention are described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the components may be selectively combined with one or more to operate. In addition, although all of the components may be implemented as a single independent piece of hardware, some or all of the components are selectively combined to perform some or all of the combined functions in one or a plurality of pieces of hardware. It may be implemented as a computer program having. Codes and code segments constituting the computer program may be easily inferred by a person skilled in the art. Such a computer program may implement an embodiment of the present invention by being stored in a computer-readable non-transitory computer readable media, read and executed by a computer.

Here, the non-transitory readable recording medium means a medium that stores data semi-permanently and can be read by a device, not a medium that stores data for a short moment, such as a register, cache, or memory. . Specifically, the above-described programs may be provided by being stored in a non-transitory readable recording medium such as a CD, DVD, hard disk, Blu-ray disk, USB, memory card, or ROM.

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, and is common in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Of course, various modifications and implementations are possible by those with knowledge of, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

101: charging port (or inlet) 111: main body
111a, 430: display 113: cable
115: plug 400: with switch function
410: RC function part 420: control pilot function part

Claims (8)

As an electric car portable charger provided in an electric car,
A voltage supply unit for providing external commercial power to the charging inlet through a charging connector connected to the charging inlet of the electric vehicle;
a sensor unit for sensing voltage and current of commercial power supplied to the charging port;
a switching unit including a switching element that is turned on and off according to the state of the sensed voltage and current; and
A control unit for adjusting the degree of on/off of the switching element according to the sensed values of the sensed voltage and current and a user command for selecting the current range of the commercial power supply;
The control unit checks whether the protective conductor is connected to the electric vehicle using a pilot signal,
The control pilot unit connected between the control unit and the charging connector provides the pilot signal to the charging port of the electric vehicle through the charging connector, determines that the charging connector is connected to the charging port when there is a response signal, and determines that the charging connector is connected to the charging port. and determines whether or not the connection is established when a reflection signal is detected using the pilot signal;
The control unit detects a DC residual current, compares a current value of the detected residual current with a residual operating current value, and when the residual current exceeds the operating current value as a result of the comparison, an opening function of the protection circuit composed of the switching element Do,
The voltage supply unit is composed of first to third power lines, supplies the commercial power to the first and second power lines, and uses the third power line as a ground line,
The sensor unit,
a voltage sensor connected to the first power line and the second power line to sense the voltage of the commercial power;
a leakage current sensor connected to the first power line and the second power line to sense leakage current; and
A current sensor connected to the first power line or the second power line to sense the current of the commercial power supply;
Including, electric car portable function box all-in-one charger. According to claim 1,
The electric vehicle portable function box integrated charger further comprising a display displaying the detected voltage and current detection results on a screen under the control of the control unit and receiving a user command for selecting the current range. According to claim 2,
When the user command is received through the display, the control unit adjusts the on/off degree by varying the bias voltage applied to the switching element based on the received user command. . According to claim 1,
The control unit turns off the switching element in the turned-on state when leakage current is detected based on a detection result of the sensor unit. delete delete delete As a driving method of an electric car portable function box integrated charger that is portablely provided in an electric car,
Providing, by a voltage supply unit, external commercial power to the charging port of the electric vehicle through a charging connector connected to the charging port;
detecting, by a sensor unit, voltage and current of commercial power provided to the charging port;
turning on/off operation of a switching unit including a switching element according to the state of the sensed voltage and current; and
Controlling, by a control unit, the degree of on-off of the switching element according to the sensed values of the sensed voltage and current and a user command for selecting the current range of the commercial power; including,
The controller checks whether the protective conductor is connected to the electric vehicle using a pilot signal,
The control pilot unit connected between the controller and the charger connector provides the pilot signal to the charging port of the electric vehicle through the charging connector, and determines that the charging connector is connected to the charging port when there is a response signal, and the control unit and determines whether or not the connection is established when a reflected signal is detected using the pilot signal;
The control unit detects a DC residual current, compares a current value of the detected residual current with a residual operating current value, and when the residual current exceeds the operating current value as a result of the comparison, an opening function of the protection circuit composed of the switching element Do,
The voltage supply unit is composed of first to third power lines, supplies the commercial power to the first and second power lines, and uses the third power line as a ground line,
The step of sensing the sensor unit is,
sensing, by a voltage sensor connected to the first power line and the second power line, the voltage of the commercial power;
sensing leakage current by a leakage current sensor connected to the first power line and the second power line; and
Sensing, by a current sensor connected to the first power line or the second power line, the current of the commercial power supply;
Including, driving method of electric vehicle portable function box integrated charger.

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