KR20200001406A - Charge system and interface apparatus - Google Patents

Abstract

The present invention relates to a charging system and an interface apparatus. An object of the present invention is to provide a charging system and an interface apparatus which solve problems of increases in volume and costs according to the MCU application by implementing charging sequence without applying a micro controller unit (MCU) which has been essentially required for dropping voltage of a control pilot (CP) pin to 6 V in accordance with J1772 international standard specification, thereby performing charging of an electric drive device. The charging system includes: a charging part which includes a first pin having a first output voltage formed therein in an initial state that the first pin is connected to a reference resistor and separated from an external device, which controls supply of charging power on the basis of charging sequence defined according to a change in voltage formed in the first pin, and which is operated to supply charging power when a third output voltage is formed in the first pin; and an interface circuit part which includes a link node connected to the first pin and interfaces charging power from the charging part to the electric drive device by dropping voltage of the link node from a first output voltage to a third output voltage through one or more resistors and one or more switches that are branched off from the link node and connected to one another in a state that the first pin and the link node are connected.

Description

Charging system and interface device {CHARGE SYSTEM AND INTERFACE APPARATUS}

The present invention relates to a charging system and an interface device, and more particularly, to a charging system and an interface device for charging an electric drive device.

Recently, development of automobiles that generate power by using environmentally friendly alternative energy is being actively conducted at home and abroad. As vehicles using such environmentally friendly alternative energy, pure electric vehicles (EV), fossil fuels and electric energy are used. Hybrid electric vehicles (HEV) and fuel cell electric vehicles (FCEV). Furthermore, the development of electric vehicles tends to be extended to various vehicles such as single electric miniature electric vehicles, electric scooters, and electric bicycles.

In general, an electric vehicle includes a battery charged with electric power for driving a three-phase motor, a three-phase motor driven with electric power charged in the battery to drive the electric vehicle, an inverter for driving a three-phase motor, and the like. Doing. At this time, when the power remaining in the battery falls below a predetermined amount, it is necessary to charge the battery since the three-phase motor can no longer be driven. To this end, the electric vehicle is charged through a charging infrastructure that rectifies a commercial 220V AC voltage from a power grid and charges a battery, and has a 5-pin connector or a 7-pin connector as shown in FIG. 1 as a charging method through the charging infrastructure. The method of charging an electric vehicle through a slow charger is widely applied.

When charging an electric vehicle through a charging infrastructure, the voltage on the control pilot (CP) pin must be reduced to 6 V in accordance with J1772 international standards. To do this, the voltage on the CP pin must be reduced when designing the on-board charger (OCC). Since a microcontroller unit (MCU) that drops down to 6V is indispensable, there is a problem of increased volume and cost according to the MCU application.

In addition, the electric vehicle may be charged using a slow charger having a 5-pin connector or a 7-pin connector, while the ultra-small electric drive device which is charged through a charging plug such as an electric scooter or an electric bicycle may have the charging infrastructure described above. There are limitations that cannot be utilized.

Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 10-2015-0140920 (published on December 17, 2015).

The present invention was devised to solve the above problems, and an object according to an aspect of the present invention is to implement a charging sequence without the application of an MCU, which was required to drop the voltage of the CP pin to 6V according to the J1772 international standard. By providing a charge of the electric drive device to provide a charging system and interface device to solve the problem of increased volume and cost according to the MCU application.

Still another object of the present invention is to provide a charging system and an interface device capable of charging a micro electric drive device such as an electric scooter or an electric bicycle by utilizing an existing charging infrastructure.

According to an aspect of the present invention, a charging system includes a first pin connected to a reference resistor to form a first output voltage in an initial state separated from an external device, and defined according to a voltage change formed on the first pin. A charging unit configured to control supply of charging power based on a charging sequence, the charging unit operative to supply the charging power when a third output voltage is formed at the first pin, and a link node connected to the first pin, By lowering the voltage of the link node from the first output voltage to the third output voltage through one or more resistors and one or more switches branched from the link node while the first pin and the link node are connected, And an interface circuit unit for interfacing the charging power from the charging unit to the electric drive device.

In the present invention, the interface circuit unit is connected to the first branch node branched from the link node, and the first output voltage through the voltage distribution with the reference resistor in accordance with the connection of the first pin and the link node. A first resistor for dropping to form a second output voltage at the link node, a first switch for exciting the current flowing through the first resistor to ground, a second branch connected to a second branch node branching from the link node A node connected to a resistor, a third branch node branched from the link node, a third resistor for dropping the second output voltage to form the third output voltage at the link node, and a node connected to the second resistor. And a second switch for turning on and off the voltage supplied from the second resistor to excite the current flowing to the third resistor to ground. And a gong.

In the present invention, the first and second switches are NPN Bipolar Junction Transistors (BJTs), and the first resistor is connected between the first branch node and a base terminal of the first switch. A resistor is connected between the second branch node and the collector terminal of the first switch, the third resistor is connected between the third branch node and the collector terminal of the second switch, and the first switch The collector terminal and the base terminal of the second switch are commonly connected, and each emitter terminal of the first and second switches is connected to the ground.

In the present invention, the charging unit, the second pin connected to the base terminal of the first switch, the fourth and fifth resistors connected in series between the second pin and the ground, and is opened and closed according to the user's operation, and closed And a charge control switch for shorting both terminals of the fifth resistor in an open state and electrically connecting the fifth resistor to the fourth resistor in an open state.

In the present invention, when the charge control switch is opened according to the user's operation, the interface circuit unit increases the voltage applied to the base terminal of the first switch, the first switch is turned on, and the first switch As the switch is turned on, the voltage applied to the base terminal of the second switch drops so that the second switch is turned off, thereby floating the third resistor, and as the third resistor is floated, the link node. The second output voltage is formed at the to characterized in that the operation to stop the supply of charging power from the charging unit.

An interface device according to an aspect of the present invention includes a link node connected to a CP pin of a charging unit, and the one or more resistors and one or more switches branched from the link node while the CP pin and the link node are connected to each other. An interface circuit unit for interfacing the charging power from the charging unit to an electric driving device by sequentially lowering the voltage of the link node through the charging node, wherein the charging unit is a control pilot (CP) pin to which a reference resistor is connected by applying a J1772 standard protocol. To control the supply of the charging power based on the charging sequence according to the output voltage formed in the interface circuit portion, and accommodates the board mounted with the interface circuit portion therein, from the charging portion through the operation of the interface circuit portion Charge power of the ball into the electric drive So that it can be characterized by including the body portion for electrically connecting the connector and the charging plug of the electric drive system of the charging section.

In the present invention, the interface circuit portion is connected to the first branch node branched from the link node, and 12V initially formed on the CP pin through voltage distribution with the reference resistor in accordance with the connection of the CP pin and the link node. A first resistor for dropping the voltage to form a 9V voltage at the link node, a first switch for exciting the current flowing through the first resistor to ground, and a second branch connected to a second branch node branched from the link node A third resistor connected to a resistor, a third branch node branched from the link node, a third resistor for dropping the 9V voltage to form a 6V output voltage at the link node, and a voltage supplied from a node connected to the second resistor; And a second switch for on-off operation through the second resistor to excite the current flowing to the third resistor to ground. The.

According to one aspect of the present invention, the present invention is essential to reduce the voltage of the CP pin to 6V by allowing a charging sequence according to the J1772 international standard is implemented through an interface circuit implemented through a predetermined resistance element and a switch element By eliminating the MCU application, the problem of volume and cost increase due to the MCU application can be solved.

Also, based on the interface circuit, the connector's connector and the electric drive's charging plug are electrically connected to allow the use of existing charging infrastructure to charge micro electric drive devices such as electric scooters or electric bicycles. The ease of charging of the device can be improved.

1 is an exemplary view showing a 5-pin connector and a 7-pin connector applied to a conventional slow charger.
2 is a block diagram illustrating a charging system according to an embodiment of the present invention.
3 is an exemplary diagram illustrating an output voltage formed at a first pin in a charging system according to an exemplary embodiment of the present invention.
4 is a circuit diagram illustrating a circuit configuration of a charging system according to an embodiment of the present invention.
5 is a block diagram illustrating an interface device according to an embodiment of the present invention.
6 is an exemplary diagram illustrating an example of implementing an interface device according to an embodiment of the present invention.

Hereinafter, embodiments of a charging system and an interface device according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

2 is a block diagram illustrating a charging system according to an embodiment of the present invention, Figure 3 is an exemplary view showing the output voltage formed on the first pin in the charging system according to an embodiment of the present invention. 4 is a circuit diagram illustrating a circuit configuration of a charging system according to an embodiment of the present invention.

Referring to FIG. 2, the charging system 1 according to an embodiment of the present invention may include a charging unit 100 and an interface circuit unit 200.

First, the operation of the charging unit 100 according to the present embodiment will be described as an example of charging the electric vehicle.

The charging unit 100 of the present exemplary embodiment may mean a slow or rapid charger provided at a charging station for charging a battery of an electric drive device such as an electric vehicle, and may be connected to the vehicle through a connector including first to fifth pins. Can be. According to international standard J1772, the first to fifth pins may be CP pins, PP pins, PE pins, L pins, and N pins, respectively. The charging unit 100 may supply charging AC power (AC 220V) to the on-board charger (OCC) of the vehicle through the fourth and fifth pins, and the third pin may form a ground terminal in a state of being connected to the vehicle. Can be.

The first pin is provided to apply a charge control pilot (PWM) voltage signal to the vehicle. 3 shows an example of a charge control pilot (PWM) voltage signal formed on the first pin. The first to third output voltages described below as the output voltage of the first pin mean a charge control pilot (PWM) voltage signal, and for convenience of understanding, the first to third output voltages correspond to respective charge control pilots ( PWM) will be described as a high-level voltage signal of the voltage signal. That is, according to FIG. 3, the first to third output voltages may mean + 12V, + 9V, and + 6V, respectively, according to the international standard J1772.

Referring to the first pin in detail, as shown in FIG. 2, the first output voltage in the initial state in which the reference resistor R_ref and the PWM voltage control transistor TR_PWM are connected to the first pin and separated from an external device is shown. That is, a PWM voltage (feq .: 1 kHz) which sets 0 V and the first output voltage as Low-Level and High-Level, respectively, is formed. When the charging unit 100 and the vehicle (electric drive device) are connected, the first pin is typically connected to a resistor provided on the vehicle side to form a second output voltage in which the first output voltage drops. The OBC of the vehicle senses a second output voltage formed on the first pin using an MCU provided therein, and forms a third output voltage having the second output voltage dropped on the first pin through a predetermined switch control. The charging unit 100 senses a third output voltage formed on the first pin and supplies charging AC power to the OBC of the vehicle through the fourth and fifth pins. Accordingly, the OBC may convert the charging AC power supplied through the fourth and fifth pins into DC power through the power converter to charge the battery of the vehicle.

In order to control the operation of the charging sequence described above, an OBC of a vehicle requires an MCU. Accordingly, a problem of volume and cost increase occurs due to the application of the MCU. Thus, the present embodiment provides an interface circuit for removing the application of the MCU. present. Hereinafter, this embodiment will be described in detail with reference to FIGS. 2 to 4.

First, the charging unit 100 may include a first pin connected to the reference resistor R_ref to form a first output voltage in an initial state separated from an external device. The charging unit 100 controls the supply of the charging power based on the charging sequence defined according to the voltage change formed on the first pin, and operates to supply the charging power when the third output voltage is formed on the first pin. have. According to International Standard J1772, the first pin means CP pin, the first to third output voltages mean 12V, 9V and 6V, respectively, and the charging sequence is the first to third output voltages on the first pin. This may mean a sequence formed sequentially.

The interface circuit 200 includes a link node N_LINK connected to the first pin of the charging unit 100, and is branched from the link node N_LINK while the first pin and the link node N_LINK are connected. By lowering the voltage of the link node N_LINK from the first output voltage to the third output voltage through the above resistance and the at least one switch, the charging power from the charging unit 100 may be interfaced to the electric driving device.

That is, the present embodiment forms a third output voltage on the first pin through one or more resistors and one or more switches branched from the link node N_LINK connected to the first pin of the charging unit 100, thereby providing the MCU with the MCU. Without a separate control operation, a configuration in which a charging sequence for supplying charging power from the charging unit 100 is implemented in a circuit is adopted.

A circuit configuration of the interface circuit unit 200 will be described in detail with reference to FIG. 4.

As shown in FIG. 4, the interface circuit 200 may include first to third resistors R1, R2, and R3, and first and second switches TR1 and TR2.

The first resistor R1 is connected to the first branch node N1 branched from the link node N_LINK, and is divided with the reference resistor R_ref according to the connection of the first pin and the link node N_LINK. The first output voltage may be dropped to form a second output voltage at the link node N_LINK. The first switch TR1 may operate to excite the current flowing to the first resistor R1 to ground. The second resistor R2 is connected to the second branch node N2 branched from the link node N_LINK. The third resistor R3 is connected to the third branch node N3 branched from the link node N_LINK, and the second output voltage can be dropped to form a third output voltage at the link node N_LINK. The second switch TR2 may operate to turn on / off the voltage flowing from the node connected to the second resistor R2 to excite the current flowing to the third resistor R3 to ground.

In this case, the first and second switches TR1 and TR2 may be implemented as NPN Bipolar Junction Transistors (BJTs). Accordingly, the first resistor R1 is connected between the first branch node N1 and the base terminal of the first switch TR1. The second resistor R2 is connected between the second branch node N2 and the collector terminal of the first switch TR1. The third resistor R3 is connected between the third branch node N3 and the collector terminal of the second switch TR2. The collector terminal of the first switch TR1 and the base terminal of the second switch TR2 are commonly connected, and each emitter terminal of the first and second switches TR1 and TR2 is connected to ground.

Referring to the operation of the above-described circuit configuration, when the charging unit 100 and the interface circuit unit 200 is connected to the first pin and the link node N_LINK having the first output voltage are connected, the first pin, the link node N_LINK, a first resistor R1, a base terminal of the first switch TR1, and an emitter terminal of the first switch TR1 are formed, and a reference resistor R_ref and a first resistor ( Due to the voltage distribution between R1), a second output voltage having the first output voltage dropped is formed at the link node N_LINK.

In this case, a current path is also formed that leads to the first pin, the link node N_LINK, the second resistor R2, the base terminal of the second switch TR2, and the emitter terminal of the second switch TR2. According to the turn-on operation of the switch TR2, the current flowing to the third resistor R3 (that is, the collector current of the second switch TR2) is excited to ground (that is, the third resistor R3 is removed from the floating state. After switching to the active state, a third output voltage having the second output voltage dropped is formed at the link node N_LINK by the third resistor R3.

Accordingly, the charging unit 100 detects the third output voltage (that is, the third output voltage formed on the first pin) formed at the link node N_LINK and supplies charging power through the fourth and fifth pins ( The charging unit 100 senses the third output voltage formed on the first pin through the provided control unit (MCU), and closes the relay element which regulates commercial AC power (AC 220V) from the system to close the fourth and fifth parts. Charging power can be supplied through the pin).

On the other hand, the normal slow charger is provided with a predetermined charge control switch that can be operated by the user to stop charging in the state of charge for the electric vehicle, therefore, the interface circuit unit 200 of the present embodiment is also compatible with the operation of the charge control switch There is a need to be.

As a configuration for this, the charging unit 100 of the present embodiment may further include a second pin, fourth and fifth resistors R4 and R5 and a charge control switch SW together with the first pin. The second pin may be connected to the base terminal of the first switch TR1 and may be implemented as a PP pin when conforming to the international standard of J1772. The fourth and fifth resistors R4 and R5 are connected in series between the second pin and ground. The charge control switch SW opens and closes according to a user's operation. In the closed state, the terminal of the fifth resistor R5 is shorted, and in the open state, the fifth resistor R5 is electrically connected to the fourth resistor R4. It works to connect.

Accordingly, when the charge control switch SW is opened in response to a user's operation, the interface circuit 200 increases the voltage applied to the base terminal of the first switch TR1 so that the first switch TR1 is turned on. As the first switch TR1 is turned on, the voltage applied to the base terminal of the second switch TR2 drops and the second switch TR2 is turned off, thereby causing the third resistor R3 to float. As the third resistor R3 is floated, a second output voltage is formed at the link node N_LINK so that the supply of charging power from the charging unit 100 may be stopped.

Specifically, when the charge control switch SW is closed, both terminals of the fifth resistor R5 are short-circuited and only the fourth resistor R4 is connected to the first pin. A low voltage (eg 0.3V) is formed at the base terminal of TR1). Accordingly, the first switch TR1 is in an off state, the second switch TR2 is in an on state, and a third output voltage is formed at the link node N_LINK by the third resistor R3, thereby being charged. The power supply state is maintained.

When the charge control switch SW is opened according to the user's operation, the second pin (that is, the base terminal of the first switch TR1) is electrically connected to the fourth resistor R4 by the fifth resistor R5. High voltages (e.g., 0.7V or more) are formed. Accordingly, the first switch TR1 is turned on, the second switch TR2 is turned off, and the third resistor R3 is floated, and as the third resistor R3 is floated, the link node N_LINK is again turned on. As the second output voltage is formed, the supply of charging power from the charging unit 100 is stopped.

Through the above-described configuration, the charging sequence for supplying the charging power from the charging unit 100 may be implemented in a circuit without maintaining a separate control operation by the MCU and at the same time maintain compatibility with the conventional slow charger.

As described above, there is a limit in that a small electric drive device such as an electric scooter or an electric bicycle cannot be charged by using a slow charger having a 5-pin connector or a 7-pin connector. By electrically connecting the connector of the slow charger (that is, the charging unit 100) and the charging plug of the electric drive device through the interface circuit 200, a configuration capable of charging the micro electric drive device through the slow charger is provided.

5 is a block diagram illustrating an interface device according to an embodiment of the present invention, and FIG. 6 is an exemplary view showing an example of implementing an interface device according to an embodiment of the present invention.

5 and 6, the interface device 2 according to the second embodiment may include an interface circuit unit 200 and a body unit 300.

The charging unit 100 and the interface circuit unit 200 are the same as those of the first embodiment, and will be described below as an embodiment to which the J1772 standard protocol is applied.

First, the charging unit 100 may apply the J1772 standard protocol to control the supply of charging power based on a charging sequence according to an output voltage formed at the CP pin to which the reference resistor R_ref is connected.

The interface circuit 200 includes a link node N_LINK connected to the CP pin of the charging unit 100, and at least one resistor branched from the link node N_LINK while the CP pin and the link node N_LINK are connected to each other. And by sequentially dropping the voltage of the link node N_LINK through one or more switches, charging power from the charging unit 100 may be interfaced to the electric driving device.

The interface circuit unit 200 is connected to the first branch node N1 branched from the link node N_LINK, as described in Embodiment 1, and according to the connection of the CP pin and the link node N_LINK, the reference resistor R_ref. The first resistor R1 and the current flowing through the first resistor R1 are grounded to form a 9V voltage at the link node N_LINK by dropping the 12V voltage initially formed at the CP pin through voltage division with the voltage. For the first switch TR1, the second resistor R2 connected to the second branch node N2 branched at the link node N_LINK, and the third branch node N3 branched at the link node N_LINK. And a third resistor R3 for dropping the 9V voltage to form a 6V output voltage at the link node N_LINK, and an on-off operation through a voltage supplied from a node connected to the second resistor R2. Second switch TR2 for exciting current flowing through third resistor R3 to ground It can be included.

The body part 300 may accommodate a substrate on which the interface circuit part 200 is mounted, and the charging part 100 may be supplied to the electric driving device through the operation of the interface circuit part 200. ) And the charging plug of the electric drive device can be electrically connected.

That is, as shown in Figure 6, the body portion 300 is formed of a synthetic resin material, one end of the connector of the charging unit 100 may be coupled, the other end may be coupled to the charging plug of the electric drive device. A conductive material (eg, copper) for connecting the L pin and the N pin of the connector of the charging unit 100 to the charging plug of the electric drive device together with the substrate on which the interface circuit 200 is mounted inside the body part 300. It may be provided.

Through the interface device 2 according to the second embodiment, a slow charger having a 5-pin connector or a 7-pin connector can be used to charge a micro electric drive device such as an electric scooter or an electric bicycle.

Meanwhile, the resistance values of the reference resistor R_ref and the first to fifth resistors R1, R2, R3, R4, and R5 described above are designed based on the experimental results of the designer within the range in which the above-described operation can be implemented. (E.g. R_ref: 1 kΩ, R1: 3.3 kΩ, R2: 100 kΩ, R3: 1.3 kΩ, R4: 150 Ω, R5: 330 Ω).

As described above, the present embodiment enables the charging sequence according to the J1772 international standard to be implemented through an interface circuit implemented through a predetermined resistance element and a switch element, thereby applying the MCU which was required to drop the voltage of the CP pin to 6V. This eliminates the problem of volume and cost increase due to MCU application.

Also, based on the interface circuit, the connector's connector and the electric drive's charging plug are electrically connected to allow the use of existing charging infrastructure to charge micro electric drive devices such as electric scooters or electric bicycles. The ease of charging of the device can be improved.

Although the present invention has been described with reference to the embodiments shown in the drawings, it is merely exemplary and various modifications and equivalent other embodiments are possible to those skilled in the art. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

1: charging system
2: interface device
100: charging part
200: interface circuit
300: body part
R_ref: reference resistance
TR_PWM: PWM Voltage Control Transistor
R1, R2, R3, R4, R5: first to fifth resistors
N_LINK: link node
N1, N2, N3: first to third branch nodes
TR1, TR2: first and second switches
SW: charge control switch

Claims (7)

And a first pin connected to a reference resistor to form a first output voltage in an initial state separated from an external device, and supplying charging power based on a charging sequence defined according to a voltage change formed on the first pin. A charging unit configured to control and supply the charging power when a third output voltage is formed at the first pin; And
And a link node connected to the first pin, wherein the voltage of the link node is controlled by one or more resistors and one or more switches that are branched from the link node while the first pin and the link node are connected. An interface circuit section for interfacing the charging power from the charging section to the electric drive device by lowering from one output voltage to the third output voltage;
Charging system comprising a.
The method of claim 1,
The interface circuit unit,
A first output voltage connected to a first branch node branched from the link node, and dropping the first output voltage through voltage distribution with the reference resistor according to the connection of the first pin and the link node to output a second output to the link node. A first resistor for forming a voltage;
A first switch for exciting a current flowing through the first resistor to ground;
A second resistor connected to a second branch node branched from the link node;
A third resistor connected to a third branch node branched from the link node, the third resistor for dropping the second output voltage to form the third output voltage at the link node; And
A second switch for on-off operation through a voltage supplied from a node connected with the second resistor to excite a current flowing to the third resistor to ground;
Charging system, characterized in that it further comprises.
The method of claim 2,
The first and second switches are NPN Bipolar Junction Transistor (BJT),
The first resistor is connected between the first branch node and the base terminal of the first switch, and the second resistor is connected between the second branch node and the collector terminal of the first switch. The third resistor is connected between the third branch node and the collector terminal of the second switch, the collector terminal of the first switch and the base terminal of the second switch are connected in common, and the first and second 2. The charging system of claim 2, wherein each emitter terminal of the switch is connected to ground.
The method of claim 3,
The charging unit,
A second pin connected to the base terminal of the first switch;
Fourth and fifth resistors connected in series between the second pin and ground; And
A charge control switch which opens and closes according to a user's operation, short-circuits both terminals of the fifth resistor in a closed state, and electrically connects the fifth resistor to the fourth resistor in an open state;
Charging system, characterized in that it further comprises.
The method of claim 4, wherein
The interface circuit unit, when the charge control switch is opened according to the user's operation, increases the voltage applied to the base terminal of the first switch so that the first switch is turned on and the first switch is turned on. As the voltage applied to the base terminal of the second switch is lowered, the second switch is turned off so that the third resistor is floating, and as the third resistor is floated, the second node is connected to the link node. Charging system, characterized in that the output voltage is formed so that the supply of the charging power from the charging section is stopped.
And a link node connected to the CP pin of the charging unit, wherein the voltage of the link node is sequentially lowered through one or more resistors and one or more switches that are branched from the link node while the CP pin and the link node are connected. And an interface circuit for interfacing the charging power from the charging unit to an electric drive device, wherein the charging unit applies a J1772 standard protocol to perform a charging sequence according to an output voltage formed at the control pilot pin connected to a reference resistor. Interface circuit unit to control the supply of the charging power based on; And
It accommodates the board mounted inside the interface circuit portion, and the electrical connection of the connector of the charging unit and the charging plug of the electric drive device so that the charging power from the charging unit can be supplied to the electric drive device through the operation of the interface circuit unit. Body portion for connecting with;
Interface device comprising a.
The method of claim 6,
The interface circuit unit,
A 12V voltage initially formed at the CP pin through a voltage distribution with the reference resistor according to the connection between the CP pin and the link node, and dropping a voltage of 9V to the link node. A first resistor for forming a voltage;
A first switch for exciting a current flowing through the first resistor to ground;
A second resistor connected to a second branch node branched from the link node;
A third resistor connected to a third branch node branched from the link node, for dropping the 9V voltage to form a 6V output voltage at the link node; And
A second switch for on-off operation through a voltage supplied from a node connected with the second resistor to excite a current flowing to the third resistor to ground;
Interface device comprising a.

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