KR20200126868A - Electric Vehicle Charging Module Device - Google Patents

Abstract

The present invention relates to an electric vehicle charger, and more specifically, to an integrated charger module device for an electric vehicle, wherein main parts constituting the electric vehicle charger installed in parking lots and housholds are configured in one integrated module form to simplify the connection between the internal structure of a conventional charger and wiring.

Description

Charger module device {Electric Vehicle Charging Module Device}

The present invention relates to a charger module device, and specifically, the charger module device may be for an electric vehicle.

In recent years, the spread of electric vehicles is expanding, and accordingly, the demand for chargers is also increasing significantly. It is expected that the spread of chargers will expand, and the demand for chargers for various applications will increase significantly. In addition, as the application fields of chargers are diversified, for example, depending on the installation location, the shape and installation of exterior shapes such as chargers installed on the wall or chargers installed on pillars, chargers installed on the ceiling, chargers attached to other devices, etc. It needs to be commercialized in various ways depending on the method. Dividing by the method of using the electric vehicle charger. Charger products are being distributed as a personal non-public charger installed and used by an individual in a home, a public charger installed in a public parking lot, or a large building parking lot, and used through user authentication.

As described above, according to the installation location and usage method of the electric vehicle charger, it must be manufactured and manufactured in various forms. Although the external form and functional requirements vary, the main functions required by the original electric vehicle charger are the same. The main parts used inside the charger are also composed of parts with similar functions.

Conventionally, a circuit board for controlling the charging function, an earth leakage breaker, a power meter, a wired wireless communication module, a card recognition device for user authentication, etc. are placed inside the charger case, and an LED display device that allows the user to check the operation, an LCD display Electric vehicle chargers are manufactured by using components such as switches and touch input components for devices and users to operate electric vehicle chargers, charging lines and charging connectors for supplying charging power to electric vehicles.

In addition, the above-described conventional electric vehicle charger constitutes an electric vehicle charger using wiring components in which terminals and wires are combined for electrical connection between the respective components. In order to arrange and fix the above-described plurality of parts inside the charger case, assembly parts such as screws are used.

Most of the wiring components and assembly components are manually assembled to manufacture electric vehicle chargers, and there is a problem in that the internal structure is complicated due to a number of wiring components. In particular, since the charger is often installed outdoors, there is a problem in that a breakdown such as short circuit and poor contact occurs between wirings due to inflow of moisture, dust, and foreign substances due to exposure to the external environment for a long time.

The earth leakage circuit breaker used in conventional electric vehicle chargers is the same as the earth leakage circuit breaker used in general electric facilities. The circuit that detects the leakage current inside the plastic case is configured on the circuit board, and the power cutoff relay, power input terminal, It is composed of the power output terminal as a core part.

A power meter used in a conventional electric vehicle charger is generally the same as a power meter used in an electrical facility, and a circuit board for sensing and calculating power is constructed in a plastic case. In addition, a communication circuit for transmitting the calculated power is used as a core component, and a power input terminal and a power output terminal for connecting a power line are provided.

Relays used in conventional electric vehicle chargers are generally the same as relays used in electrical facilities, and are composed of electrical contacts, electromagnets, power input terminals, and power output terminals as core parts inside a plastic case.

Communication and card readers used in conventional electric vehicle chargers include microprocessors, near field communication (NFC) or RFID card recognition circuits, and communication circuits for wired communication or wireless communication. It is configured to connect the charging control circuit board and the communication signal line through.

It is intended to provide a charging module device that can simplify assembly parts such as wiring parts and screws.

A charger module device for charging an electric vehicle according to one aspect of the invention includes a power inlet terminal for receiving electric vehicle charging power, a leakage detection unit for detecting a leakage current, a power metering unit for measuring the amount of charging power, and a power supply or blocking unit. A charging control unit connected to the relay, the earth leakage detection unit, the power metering unit, and the relay unit to generate a control pilot signal, a control pilot signal connection terminal for connecting the control pylon signal, and a charging for connection to the electric vehicle And a line connection terminal, wherein the power inlet terminal, the earth leakage detection unit, the power metering unit, the relay, the charging control unit, the control pilot signal connection terminal, and the signal connection terminal are embedded on a circuit board.

The charger module device includes a display device driving unit, a switch and a touch input unit, a card recognition unit, the display device driving unit, the switch and touch input unit, and a terminal connected to the card recognition unit, which is built on the circuit board. It may further include an integrated connection connector, and a communication unit for communication of a standard Ethernet method.

The charger module device may further include upper and lower cases covering the circuit board.

A charger module device according to another aspect of the invention includes a relay connected between a charging line connection terminal and a lead-in connection terminal to which input power is supplied, a leakage amount based on a differential current between a first phase current and a second phase current of the input power, and a predetermined amount. An electric leakage detection unit that detects an electric leakage based on a result of comparing the differential current threshold, a power meter that detects the voltage of the input power and calculates power based on the detected current and the sensed voltage according to the first phase current And a charging control unit that cuts off the relay when at least one of a short circuit and an overcurrent is detected, and the relay, the leakage detection unit, the power metering unit, and the charging control unit are embedded on a circuit board.

The earth leakage detection unit senses a differential current when only the first phase current flows to the ground, detects a differential current when only the second phase current flows to the ground, the first wiring through which the first phase current flows, and the When connecting a second wiring through which a second phase current flows, a differential current is sensed, and a leakage test circuit may be included to check the state of the first wiring, the second wiring, and the ground leakage detection unit.

The leakage test circuit includes a first resistor including one end connected to the first wire, a first switch connected between the other end of the first resistor and a ground, and a series between the first wire and the second wire It may include a connected second resistor and a second switch, and a third switch connected between the ground and a contact point to which the second resistor and the second switch are connected.

The earth leakage detection unit calculates the leakage amount based on the differential current, analyzes the leakage amount according to the sensed voltage value, compares the leakage amount and the differential current threshold value, and determines whether there is a leakage current according to the comparison result. It may include a ground fault determining unit to determine.

The power metering unit may calculate an average current by averaging the detected current according to the first phase current for a predetermined time, and multiplying the sensed voltage by the average current to calculate instantaneous power.

A charging module device capable of simplifying assembly components such as wiring components and screws is provided by replacing wiring components connecting main components used in the conventional electric vehicle charger described above with a circuit board.

1 is a schematic diagram showing the internal structure of a conventional electric vehicle charger.
2 is a photograph of an example of a conventional electric vehicle charger actually manufactured in the related art.
3 is a diagram schematically illustrating an embodiment of configuring a charger using the module of the present invention.
4 is an exploded perspective view showing the structure of a charger module device according to an embodiment.
5 is a block diagram schematically showing the internal structure of a charger module device according to an embodiment.
6 is a view showing the appearance of a charger module device according to an embodiment.
7 is a diagram illustrating a case where a charger module device according to an embodiment is installed in an external case of an electric vehicle charger.
8 is a diagram showing a partial configuration of a charger module device according to an embodiment of the present invention.
9 is a diagram illustrating an earth leakage test circuit according to an exemplary embodiment.
10 is a modified example of an earth leakage detection unit according to an embodiment of the present invention.
11 is a flow chart showing a charging method according to an embodiment.

In one embodiment of the present invention, the main components constituting the electric vehicle charger are configured in a single integrated module form, and a plurality of components used in the conventional electric vehicle charger are integrated into one and implemented in a module form, thereby minimizing wiring components. And, it relates to a charger module device for an electric vehicle charger capable of simplifying the complex wiring structure of the electric vehicle charger.

An embodiment relates to a charger module device capable of significantly reducing the number of wiring components and assembly components for connection between components by integrating a plurality of component functions arranged inside an electric vehicle charger into a circuit board. In one embodiment, the same functional circuit as the circuit of the main component is circuitly arranged and mounted on a circuit board, and the functional circuit may be electrically connected by wiring pattern connection on the circuit board.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are given the same and similar reference numerals, and redundant descriptions thereof will be omitted. The suffixes "module" and/or "unit" for constituent elements used in the following description are given or used interchangeably in consideration of only the ease of writing the specification, and do not themselves have a distinct meaning or role from each other. In addition, in describing the embodiments disclosed in the present specification, when it is determined that detailed descriptions of related known technologies may obscure the subject matter of the embodiments disclosed in the present specification, detailed descriptions thereof will be omitted. In addition, the accompanying drawings are for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention It should be understood to include equivalents or substitutes.

Terms including ordinal numbers, such as first and second, may be used to describe various elements, but the elements are not limited by the terms. These terms are used only for the purpose of distinguishing one component from another component.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. It should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

In the present application, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

In order to correctly describe the objects and features of the present invention, first, a conventional electric vehicle charger will be described.

1 is a schematic diagram showing the internal structure of a conventional electric vehicle charger.

The contents shown in FIG. 1 are brief representations of main matters for explaining differences from the present invention, and although not specifically expressed in FIG. 1, a display device and other auxiliary parts may additionally be provided.

2 is a photograph of an example of a conventional actually manufactured electric vehicle charger.

In Fig. 2, the same components as those shown in Fig. 1 are denoted by the same reference numerals. 2 is a picture of a charger excluding communication and card reader.

3 is a diagram schematically illustrating an embodiment of configuring a charger using the module of the present invention.

Reference numeral 51 denotes an electric vehicle charger case, and FIG. 3 shows a simplified electric vehicle charger case. The charger module device 1 shown in FIG. 3 is connected to a charging power lead-in line 40, a charging line 33, a card contactor 12, and a communication connection line 40, and as shown in FIG. The charger is configured. The charging line 33 means a power line, and in general, the charging line 33 and a control pilot signal line 43 for charging control are manufactured and used in the form of a single cable.

As shown in FIG. 1, a conventional electric vehicle charger 1 includes an earth leakage circuit breaker 20, a power meter 21, a relay 22, a charge control circuit board 10, and a communication and card reader 11. Include. Typically, each of the earth leakage circuit breaker 20, the power meter 21, and the relay 22 is provided with a terminal for connecting an input line and an output line. Typically, 220V single-phase AC has two terminals on the input side and two terminals on the output side to connect the L line (Live) and the N line (Neutral). In FIG. 1, the electrical connection relationship between the earth leakage circuit breaker 20, the power meter 21, the relay 22, the charge control circuit board 10, and the communication and card reader 11 is simplified and illustrated.

A connection configuration in which charging power is supplied to an electric vehicle will be described with reference to FIG. 1.

In FIG. 1, reference numeral 50 denotes an electric vehicle charger case, and in FIG. 1, the electric vehicle charger case is simplified.

The charging power lead-in line 30 for supplying charging power is connected to the input terminal of the earth leakage circuit breaker 20, and the output terminal of the earth leakage circuit breaker 20 is connected to the input terminal of the power meter 21 through the wiring part 31. The output terminal of the power meter 21 is connected to the input terminal of the relay 22 through the wiring component 32, the output terminal of the relay 22 is connected to the electric vehicle charging line 33, and the charging connector 60 ) Is connected to the electric vehicle through a charging terminal (not shown) provided in the vehicle body of the electric vehicle, and charging power is supplied to the electric vehicle. The charging line 33 shown in FIG. 1 is shown by simplifying the L line and the N line in the case of a typical 220V single-phase AC. The charging line 33, the ground line 35, and the control pilot signal line 43 may be manufactured to be inserted into the charging connector 60 in the form of an integrated cable within the sheath of a rubber insulating material. The charging connector 60 has a clasp shape that is coupled with the handle part and the charging terminal installed in the electric vehicle, and the terminal contact part is a contact connection part (not shown) so that the L line, N line, ground line, and control pilot signal line 43 contact each other. Is provided, and a signal line for detecting the connection between the charging terminal provided in the electric vehicle body and the charging connector 60 is added, and typically includes five contact parts.

In the conventional electric vehicle charger shown in FIG. 1, the charging control circuit board 10 and the power meter 21 performing a charging function are connected by a signal line 41, so that the charging power amount information of the power meter is transferred to the charging control circuit board. It is supposed to be delivered to (10). The relay 22, which is a function of supplying and blocking charging power, is connected to the charging control circuit board 10 and the relay control output line 42. Typically, the relay control output line 42 is used to turn the relay ON (contact) and OFF (block).

In addition, the above-described conventional electric vehicle charger includes a communication and card reader 11 as shown in FIG. 1 when a user authentication function and a connection with a charging service server (not shown) installed in a remote location are required, and user authentication And charger operation status information, charging power amount information, etc. are transmitted to the charging service server. Usually, an Ethernet communication method is used.

In addition, the card contactor 12 connected to the communication and card reader 11 includes an antenna module for card recognition using a short-range wireless communication (NFC) method or an RFID method, or an IC card recognition module for recognizing IC card information. Can be. The connection of the communication and card reader 11 to an external charging service server is generally connected by a communication connection line 40, but is also replaced by wireless Internet or wireless communication module parts such as LTE, LORA, and Bluetooth. have.

Reference numerals '31', '32', '34', '41', '42', and '44' shown in FIG. 1 denote wiring components, and are in a form in which terminals and wires are combined. Means wiring used in electric equipment. Reference numeral 35 in FIGS. 1 and 2 denotes a ground line.

As shown in FIG. 1, in order to configure a conventional electric vehicle charger, wiring components such as '31', '32', '34', '41', '42', and '44' are used. It can be seen that the connection between parts is essential. As shown in FIG. 2, it can be seen that a number of wiring components are used.

4 is an exploded perspective view showing the structure of a charger module device according to an embodiment.

5 is a block diagram schematically showing the internal structure of a charger module device according to an embodiment.

6 is a view showing the appearance of a charger module device according to an embodiment.

As shown in FIG. 4, the charger module device 1 has a structure in which the circuit board 100 and the upper and lower cases 110a and 110b are coupled. On the circuit board 100, connection terminals 103a and 103b for connecting charging power wiring are disposed, respectively, and a communication connection connector 101b, a control pilot signal terminal 102, and an integrated connection connector 101a are provided. The communication connection connector 101b is a connector having the same function as a commonly used Ethernet connector.

The integrated connection connector 101a is a connector to which a card contactor (Figs. 3 and 12) is connected, and is similar to a general connector in which a plurality of contact terminals are assembled, and the card recognition unit 202 and the display device driving unit ( 203), a switch and a plurality of contact terminals corresponding to the number of signal lines required by the touch input unit 204 may be included.

As shown in FIG. 4, the charger module device 1 is composed of a circuit board 100 and upper and lower cases 110a and 110b. A plurality of coupling protrusions 110a-1 may be formed on the upper case cover 110a. In FIG. 4, the upper case cover 110a and the lower case cover 110b are shown in a rectangular shape, but the invention is not limited thereto, and a coupling means formed outside the upper and lower case (for example, a coupling protrusion 110a- 1, 110b-1), and various shapes that can be implemented in a structure in which the upper and lower cases are coupled are possible. In addition, as an example of the coupling means, the coupling protrusions 110a-1 and 110b-1 are shown, but may be substituted with other types of coupling means.

The circuit board 100 shown in FIG. 4 will be described in more detail with reference to FIG. 5.

Reference numerals '103a' and '103b' shown in FIG. 4 denote the lead-in connection terminal 103a and the charging line connection terminal 103b shown in FIG. 5, respectively, and the outer part on the circuit board 100 of FIG. Is placed in.

As shown in FIG. 5, the lead-in connection terminal 103a is electrically connected to the earth leakage detection unit 207 through a filter circuit 209 on the circuit board 100, and the leakage detection unit 207 again measures power. After being electrically connected to the unit 206, it is electrically connected to the charging line connection terminal 103b through the relay 205. The relay 205 is a type that can be mounted on the circuit board 100.

In addition, the communication unit 201 is electrically connected to the communication connection connector 101b to receive a signal input through the communication connection connector 101b or outputs a signal through the communication connection connector 101b. The card recognition unit 202 is electrically connected to the integrated connection connector 101a to transmit and receive necessary information, and the integrated connection connector 101a includes a display device signal of the display device driving unit 203, a switch, and a touch input unit ( 204) is connected.

Electrical connection in the above description includes electrical connection implemented by a wiring pattern of the circuit board 100.

In order to supply the charging power required for the electric vehicle, a control pilot signal 43 through the charging connector 60 must be transmitted to a charging terminal (not shown) provided in the electric vehicle, and the control pilot signal 43 May be a signal of a method used in accordance with North American standards for electrical connectors for electric vehicles (hereinafter, SAE J1772) specified by SAE International. The above-described control pilot signal 43 may be generated by the charging control unit 200 and may be transmitted on the circuit board 100 through the control pilot signal connection terminal 102. The control pilot signal 43 may be implemented as a signal of a PWM (pulse width modulation method) of 1KHz, and is defined in detail in SAE J1772, which is used as an international standard, and the charger module device 1 is It includes a charging control unit 200 implemented on the circuit board 100 to satisfy the standard.

When the charging control unit 200 of FIG. 5 is described in more detail, the charging control unit 200 detects the occurrence of an earth leakage detection signal from the earth leakage detection unit 207, blocks the relay 205 within a predetermined time, and the charging control unit 200 performs a function of connecting or blocking a relay according to the voltage state of the control pilot signal connected to the electric vehicle through the control pilot signal connection terminal 102 in order to perform the electric vehicle charging process according to the standard standard. 200 transmits the information to an external charging service server (not shown) through the communication unit 201 using the power metering information of the power metering unit 206 and the card recognition information of the card recognition unit 202 Performs the function of In some cases, a predetermined function may be performed by receiving necessary information from an external charging service server.

As shown in FIG. 5, a filter circuit 209 is positioned next to the lead-in connection terminal 103a, and noise of the input charging power can be removed.

The earth leakage detection unit 207 of FIG. 5 detects an asymmetric current between the single-phase alternating current L line and the N line, which is the same function as the earth leakage circuit breaker 20 of FIG. 1, so that the relay 205 is blocked, the charging control unit 200 It transmits an earth leakage detection signal. The power metering unit 206 detects the voltage and current of the electric power that is transmitted to the electric vehicle through the charging line connection terminal 103b, and calculates the instantaneous power amount and the accumulated power amount. , The information is transmitted to the charging control unit 200 in a data communication method. The relay 205 serves to connect or cut off charging power by the charging control unit 200, and may be implemented as a conventional relay in a form capable of mounting a circuit board.

The power circuit unit 208 of FIG. 5 is composed of a circuit that supplies operating power of the charger module device 1, and may be implemented as a power circuit that generates a conventional DC power.

The lead line connection terminal 103a, the leakage detection unit 207, the power metering unit 206, the relay 205, and the charging line connection terminal 103b of FIG. 5 are arranged in the circuit board 100 according to the electrical safety standard. It can be implemented according to.

The charging control unit 200 of FIG. 5 includes a microprocessor (not shown), a driving circuit for controlling the operation of the relay 205, a data transmission/reception circuit connected to the power metering unit 206, and a leakage detection unit 207 ), a circuit for transmitting a control pilot signal, a circuit for transmitting and receiving card identification information with the card recognition unit 202, a signal connection circuit with the communication unit 201, and a display device driver 203 And a signal connection circuit for transmitting and receiving a switch input and a signal with the touch input unit 204.

The lower case cover 110b of FIG. 4 is in close contact with the upper case cover 110a to protect the circuit board 100 and prevent foreign matter from entering. The circuit board 100 is inserted between the upper and lower cases 110a and 110b.

7 is a diagram illustrating a case where a charger module device according to an embodiment is installed in an external case of an electric vehicle charger.

In FIG. 7, the charger module device 1 is installed in the electric vehicle charger outer case 52. The charger module device 1 is fixed to the electric vehicle charger case 52 using a screw 300, the charging power lead-in line 301 is connected to the lead-in connection terminal 103a, and the charging line 302 is connected to the charging line. It is connected to the terminal 103b.

As shown in FIG. 7, wiring components are used in the communication connection connector 101b and the integrated connection connector 101a to be connected to the outside of the charger as an example. In addition, the control pilot signal line is drawn out from the charging line 302 and connected to the control pilot signal connection terminal 102 is shown.

Compared with the picture of the conventional electric vehicle charger shown in FIG. 2, in the case of an electric vehicle charger including the charger module device 1, major components such as an earth leakage breaker, a power meter, a relay, and a charge control circuit board and a number of wiring components are simplified. Can be confirmed.

The charger module device 1 according to an embodiment includes an earth leakage circuit breaker 20, a power meter 21, a relay 22, a charge control circuit board 10, a communication and card reader 11, as shown in FIG. The power supply 23 is integrated. Accordingly, it can be seen that wiring parts corresponding to reference numerals 31, 32, 34, 41, 42, 44, etc. shown in FIGS. 1 and 2 are not required.

In the charger module device 1, the circuit board 100, the upper case 110a, and the lower case 110b are combined to prevent exposure of the circuit board 100 to protect the circuit board 100, and foreign substances, etc. Can be prevented from entering.

By applying the charger module device 1 according to the present invention, the use of wiring components is minimized, the internal configuration of the electric vehicle charger is simplified, and the circuit board 100 is formed by using the upper and lower cases 110a and 110b shown in FIG. 4. You can see that you can protect it.

8 is a diagram showing a partial configuration of a charger module device according to an embodiment of the present invention.

As shown in FIG. 8, a relay of a conventional earth leakage circuit breaker and a relay blocking the connection of charging power are implemented as one relay 205.

As shown in FIG. 8, the earth leakage circuit breaker 207 does not include a zero current transformer (ZCT) for ground protection.

The earth leakage circuit breaker 207 detects a differential current by comparing the L-phase current drawn along the wiring 301 and the N-phase current drawn along the wiring 302, and the differential current is set above a predetermined differential current threshold. If it continues for more than the threshold period of, it is determined that a short circuit/leakage has occurred, and a control signal may be transmitted to the charging control unit 200 so that the relay 205 is blocked.

The earth leakage breaker 207 includes a differential current detection unit 71, an earth leakage test circuit 72, a differential amplifier 73, a differential current detection unit 74, an earth leakage determination unit 75, and a timer 76.

The differential current sensing unit 71 senses a differential current between the L-phase current and the N-phase current. The differential current sensed by the differential current detection unit 71 is amplified by the differential amplifier 73 and input to the differential current detection unit 74. The differential current detection unit 74 generates a differential current according to the output of the differential amplifier 73.

The earth leakage determination unit 75 receives the differential current and voltage values, calculates the leakage amount based on the differential current, analyzes the leakage amount according to the voltage value, and compares the analyzed leakage amount and the differential current threshold value, and according to the comparison result Determine whether there is a short circuit. For example, the electric leakage determining unit 75 detects a phase according to a voltage value, analyzes whether the leakage amount is a resistive leakage amount, and compares it with a differential current threshold when the current amount increases in proportion to the voltage. As a result of the comparison, the earth leakage determination unit 75 may generate an earth leakage blocking signal when a period in which the leakage amount is equal to or greater than the differential current threshold is equal to or greater than the threshold period.

The timer 76 measures the elapse of time, and the earth leakage determination unit 75 may use the timer 76 to count a critical period. The earth leakage determination unit 75 may generate earth leakage detection information indicating whether or not there is an earth leakage, and transmit it to the information transmission unit of the charging control unit 200.

In order to implement the differential current sensing unit 71, a shunt element or a non-contact Hall sensor may be used. The above-described shunt element or Hall sensor may be implemented in a form capable of being mounted on a circuit board. The shunt element or Hall sensor is the same in terms of current sensing function, and the shunt element or Hall sensor can be used to detect the differential current between two phases without using an image current transformer and a current transformer. By not using a current transformer and an image current transformer that cannot be mounted on a circuit board, the difficulty and complexity of assembly can be lowered, and there is no need for manual work of terminal connection or soldering to connect the wire for passing the image current transformer. There is no need for soldering, connecting parts, etc. for this.

The earth leakage detection unit 207 according to an embodiment may perform a role of a conventional image current transformer (ZCT) for preventing a ground fault by detecting a differential component between the L-phase current and the N-phase current. In other words, the difference between the L-phase current and the N-phase current corresponds to the differential current component, and a typical leakage current is a phenomenon in which a current flows to the ground by either the human body or leakage in the L-phase or N-phase. 207 can perform the same function by detecting the differential components of the L-phase and N-phase currents.

The earth leakage test circuit 72 checks the state of the earth leakage detection unit 207 and the wirings 301 and 302 before the relay 205 is turned on.

9 is a diagram illustrating an earth leakage test circuit according to an exemplary embodiment.

As shown in FIG. 9, the earth leakage test circuit 72 includes three switches 721-723 and two resistance elements 724 and 725. The switches 721-723 may be implemented as a semiconductor switching device such as a small relay or a field effect transistor (FET).

The node N1 is connected to the wiring 302, the resistive element 724 is connected between the node N1 and one end of the switch 722, and the other end of the switch 722 is connected to the ground. The resistance element 725 is connected between the wiring 301 and the node N2, the switch 721 is connected between the node N1 and the node N2, and the switch 723 is connected to the node N2. It is connected between and ground.

First, when the switch 721 is turned on while the switches 722 and 723 are turned off, the wiring 310 and the wiring 302 are connected to form a single current path. At this time, if there is no differential current detected by the differential current sensing unit 71 or a value within a predetermined range even if the differential current is detected, the earth leakage sensing unit 207 is in a normal state. In addition, a correction value for correcting an error occurring in current detection may be calculated based on the detected differential current at this time.

Next, when the switches 721 and 723 are turned off and the switch 722 is turned on, if there is no leakage in the wiring 302, since the current of the wiring 302 flows to the ground, the differential current sensing unit ( 71) detects the differential current.

Similarly, when the switches 721 and 722 are turned off and the switch 723 is turned on, if there is no leakage in the wiring 301, only the current of the wiring 301 flows to the ground, so the differential current sensing unit ( 71) detects the differential current.

Since the values of the resistance elements 724 and 725 are already known as values set according to the design, and the voltage can be known by the voltage detector 61, the normal range for the differential current flowing when the earth leakage test circuit 72 is operated Can be seen. Accordingly, a threshold value for determining whether the differential current falls within the normal range is set in advance, and a correction value for correcting an error can also be easily calculated.

The power metering unit 206 detects a voltage difference between the L phase and the N phase, and calculates the instantaneous power and the accumulated power based on the detected current value of the L phase.

As shown in FIG. 8, the power metering unit 206 may include a voltage sensing unit 61, an amplifier 62, a power calculating unit 63, and a power accumulating unit 64.

The voltage detector 61 detects a voltage difference between the L phase and the N phase to generate a voltage value.

The amplifier 62 amplifies the L-phase detection current received from the differential current detection unit 71 to generate a current value.

The power calculator 63 calculates instantaneous power based on a voltage value and a current value. The power calculator 63 averages the current value of the detected current for a predetermined unit time to generate an average current, multiplies the voltage value and the average current to calculate active power and reactive power, and finally calculates instantaneous power. Since the above-described method of calculating active power and reactive power is a general matter, a description thereof will be omitted.

The power accumulator 64 accumulates instantaneous power and calculates the accumulated power. Accumulated power can also be calculated by dividing into active power and reactive power.

The charging control unit 200 may control the operation of the relay based on at least one of a charging start/stop signal, an earth leakage blocking signal, and an overcurrent blocking signal for controlling charging.

As shown in FIG. 8, the charging control unit 200 includes a relay operation unit 81, an OR gate 82, a control logic 83, an overcurrent cutoff determination unit 84, a power storage unit 85, and information. It includes a transmission unit (86).

The control logic 83 generates a charging start/stop signal that controls charging start and charging stop, and outputs it to the OR gate. For example, when instructing to start charging, the charging start/stop signal may have a logic low level, and when instructing to stop charging, the charging start/stop signal may have a logic high level.

The overcurrent blocking determination unit 84 receives the current value, calculates an average current, and compares the average current with an overcurrent threshold to determine whether there is an overcurrent. When the average current is greater than the overcurrent threshold, an overcurrent blocking signal is generated and output to the OR gate 82.

The OR gate 82 logically sums the overcurrent blocking signal, the charging start/stop signal, and the earth leakage blocking signal and outputs the logic sum to the relay operation unit.

The relay operation unit 81 contacts or cuts off the relay 205 according to the output of the OR gate 82. For example, when the output of the OR gate 82 is at a logic level high, the relay 205 is shut off, and when the output is at a logic level low, the relay 205 is contacted.

The power storage unit 85 may store power information on instantaneous power and accumulated power, and may transmit the power information to the information transmission unit 86.

The information transmission unit 86 may receive overcurrent detection information, electric leakage detection information, and power information, and may transmit the information to the communication unit 201.

In FIG. 8, only the overcurrent detection means is shown, but it can additionally detect a low voltage, an overvoltage, an abnormal current, and the like. In addition, not only the instantaneous power but also the peak power may be calculated together.

10 is a modified example of an earth leakage detection unit according to an embodiment of the present invention.

The same reference numerals are used for the same components as those of the earth leakage detection unit illustrated in FIG. 8, and redundant descriptions are omitted.

As shown in FIG. 10, the earth leakage detection unit 207 ′ includes two current detectors 711 and 712, two amplifiers 731 and 732, an earth leakage determination unit 75, a timer 76, and a differential current detection unit. It includes (78).

The current detector 711 is connected in series to the L-phase wiring 301, so that the voltage across both ends when the L-phase current flows through the current detector 711 is transmitted to the amplifier 731. The current sensing paper 712 is connected in series to the N-phase wiring 302, so that the voltage across both ends when the N-phase current flows through the current detector 712 is transmitted to the amplifier 732.

Each of the amplifier 731 and the amplifier 732 amplifies and outputs the difference between the two input voltages. The output of the amplifier 731 may correspond to the detection current in the exemplary embodiment shown in FIG. 8.

The differential current detection unit 78 generates a differential current according to the difference between the output of the amplifier 732 and the output of the amplifier 731 and transmits the differential current to the electric leakage determination unit 75.

11 is a flow chart showing a charging method according to an embodiment.

When the charging process starts, first, the earth leakage test circuit 72 operates (S1).

The earth leakage detection unit 207 detects a current and calculates a correction value while the earth leakage test circuit 72 is operating (S2).

If there is no abnormality in the test result, the relay 205 is contacted according to the charging start/end signal (S3).

The earth leakage detection unit 207 detects the L-phase current and the N-phase current (S4), and detects the differential current (S5).

The earth leakage detection unit 207 calculates a resistive leakage amount based on the differential current and voltage values, and determines whether the leakage amount is equal to or greater than the differential current threshold (S6).

As a result of the determination in step S6, if the differential current is not greater than or equal to the threshold value, the average current is calculated (S7), and it is determined whether the average current is greater than or equal to the threshold value (S8).

If the average current is not equal to or greater than the threshold value, the active power and the reactive power are calculated (S9), the instantaneous power amount is calculated (S10), and the accumulated power amount is calculated (S11).

Based on the power information input through the information transmission unit 86, the power amount information is transmitted through the communication unit 201 (S18).

The charging control unit 200 determines whether there is an instruction to stop charging (S19), and when there is an instruction to stop charging, blocks the relay 205 (S21). If there is no instruction to stop charging, the charging control unit 200 determines whether charging is complete (S20). When charging is complete, the relay 205 is cut off, and when charging is not completed, the power amount transmission step S18 is repeated.

When charging is stopped or charging is completed, the charging amount and termination information may be transmitted through the communication unit 201 (S22).

As a result of the determination in step S6, if the amount of leakage is equal to or greater than the differential current threshold, the earth leakage detection unit 207 calculates an elapsed time (S12).

The earth leakage detection unit 207 determines whether the calculated elapsed time is equal to or greater than a predetermined threshold period (S13).

As a result of the determination in step S13, if the leakage amount exceeding the threshold period exceeds the differential current threshold, the relay is cut off (S14), the blocking information is transmitted through the communication unit 201 (S15), and the reception of the recovery information is waited (S16).

It is determined whether there is a recovery request (S17), and if there is a recovery request, it may be repeated from step S1 again. If there is no request for recovery, the charging process can be terminated.

Until now, the embodiments described that the input power is alternating current, but the invention is not limited thereto, and may be applied even when the input power is direct current.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and a form modified and improved in various ways by a person of ordinary skill in the field to which the present invention belongs is also the right of the present invention. Belongs to the range.

According to the present invention, by integrating a plurality of components constituting a conventional electric vehicle charger into a circuit board as described above, the use of wiring components inevitably used for connection between components is minimized, thereby reducing component cost.

In addition, there is an effect of solving problems such as poor contact that may occur when connecting multiple wiring parts.

In addition, by applying the upper and lower cases to protect the circuit board, it is possible to prevent accidental damage caused by contact with a hand or a tool, prevent foreign substances, and manufacture an electric vehicle charger that operates more stably.

In addition, since the above-described wiring parts are usually assembled depending on manual labor, the work required for assembly is simplified, thereby reducing the cost of assembling the electric vehicle charger product and reducing the burden of maintenance. I can reap.

1: charger module device
100: circuit board
110a, 110b: upper and lower case
102: control pilot signal connection terminal
103a: input line connection terminal
103b: charging line connection terminal
110b-1: lower case coupling protrusion
110a-1: upper case coupling part

Claims (8)

In the charger module device for charging an electric vehicle,
Power inlet terminal to receive electric vehicle charging power,
An earth leakage detector that detects an earth leakage,
Power metering unit for metering the amount of charging power,
Relays for power supply or shutdown,
A charging control unit connected to the earth leakage detection unit, the power metering unit, and the relay unit to generate a control pilot signal,
A control pilot signal connection terminal for connecting the control pylon signal, and
It includes a charging line connection terminal to be connected to the electric vehicle,
The power input terminal, the earth leakage detection unit, the power metering unit, the relay, the charging control unit, the control pilot signal connection terminal, and the signal connection terminal are built-in on a circuit board. The method of claim 1,
Embedded on the circuit board,
Display device driving unit, switch and touch input unit, card recognition unit,
An integrated connection connector having a terminal connected to the display device driving unit, the switch and touch input unit, and the card recognition unit, and
A charger module device further comprising a communication unit for communication of a standard Ethernet method. The method according to claim 1 or 2,
The charger module device further comprising an upper and lower case covering the circuit board. A relay connected between the charging line connection terminal and the incoming line connection terminal to which input power is supplied,
An earth leakage detection unit that detects an earth leakage based on a result of comparing the leakage amount based on the differential current between the first phase current and the second phase current of the input power and a predetermined differential current threshold value,
A power metering unit that senses the voltage of the input power and calculates power based on the detected voltage and a detection current according to the first phase current, and
And a charging control unit that blocks the relay when at least one of a short circuit and an overcurrent is detected,
The charger module device wherein the relay, the earth leakage detection unit, the power metering unit, and the charging control unit are embedded on a circuit board. The method of claim 4,
The earth leakage detection unit,
A differential current is sensed when only the first phase current flows to the ground, a differential current is sensed when only the second phase current flows to the ground, and the first wiring and the second phase current through which the first phase current flows Including a leakage test circuit for detecting a differential current when connecting the second wiring flowing through, and checking the state of the first wiring, the second wiring, and the electric leakage detection unit,
Charger module device. The method of claim 5,
The earth leakage test circuit,
A first resistor including one end connected to the first wiring,
A first switch connected between the other end of the first resistor and a ground,
A second resistor and a second switch connected in series between the first wire and the second wire, and
Including a third switch connected between the ground and a contact to which the second resistor and the second switch are connected,
Charger module device. The method of claim 4,
The earth leakage detection unit,
An earth leakage determination unit that calculates the leakage amount based on the differential current, analyzes the leakage amount according to the sensed voltage value, compares the leakage amount with the differential current threshold value, and determines whether there is a leakage current according to the comparison result Included,
Charger module device. The method of claim 4,
The power metering unit,
Calculating an average current by averaging the detected current according to the first phase current for a predetermined time, and calculating an instantaneous power by multiplying the sensed voltage and the average current,
Charger module device.

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