JP-7855117-B2 - Vehicle charging device and vehicle charging method

JP7855117B2JP 7855117 B2JP7855117 B2JP 7855117B2JP-7855117-B2

Inventors

林泊淞
高敏

Assignees

台達電子工業股▲ふん▼有限公司

Dates

Publication Date: 20260507
Application Date: 20250428
Priority Date: 20240506

Claims (20)

A transformer having a first side and a second side, the second side of which is provided with two communication lines to be connected to an electric vehicle, A vehicle charging device comprising: two impedance tuners, each connected in parallel to one of the two communication lines and configured to adjust the reactance characteristics of the two communication lines.
The vehicle charging device according to claim 1, wherein each of the two communication lines has a first capacitor, each of the two impedance tuners includes at least one branch path, and each of the at least one branch path is connected in parallel to the first capacitor.
The vehicle charging device according to claim 2, wherein each of the at least one branch paths includes a switch and a second capacitor, and the switch and the second capacitor are connected in series.
The vehicle charging device according to claim 3, wherein the switch is configured such that the first capacitor and the second capacitor form a parallel circuit or an open circuit based on a control signal from the controller.
The vehicle charging device according to claim 3, wherein the switch is a high-frequency switching element.
The vehicle charging device according to claim 5, wherein the operating frequency range of the high-frequency switching element includes 150 kHz to 30 MHz.
The vehicle charging device according to claim 5, wherein the high-frequency switching element is a chip-type switch having a control terminal and two connection terminals, the second capacitor is connected between one of the two connection terminals and one end of the first capacitor, and the other of the two connection terminals is connected to the other end of the first capacitor.
The vehicle charging device according to claim 1, wherein the two communication lines include a control pilot line and a protective earth line.
The vehicle charging device according to claim 1, wherein the vehicle charging device is connected to a cloud computing platform via a network.
A vehicle charging method applied to a vehicle charging device, comprising: a transformer having a first side and a second side, the second side of which is provided with two communication lines to be connected to an electric vehicle; and two impedance tuners, each connected in parallel to one of the two communication lines and configured to adjust the reactance characteristics of the two communication lines, The steps include detecting the connection between the two communication lines connected to the vehicle charging device and the electric vehicle, The vehicle charging device and the electric vehicle communicate via power lines, and the vehicle charging device collects the signal strength of multiple signal channels of the electric vehicle. The vehicle charging device monitors the communication characteristics of the two communication lines based on the signal strength of the plurality of signal channels, and ensures that the signal strength of the two communication lines satisfies the strength requirements. A vehicle charging method comprising the step of: the vehicle charging device entering a charging mode for the electric vehicle in response that the signal strength of the two communication lines satisfies the strength requirement.
The vehicle charging device monitors the communication characteristics of the two communication lines based on the signal strength of the multiple signal channels, and the step of ensuring that the signal strength of the two communication lines satisfies the strength requirement is: The vehicle charging device calculates the average signal strength based on the signal strength of the multiple signal channels, The vehicle charging method according to claim 10, further comprising: the vehicle charging device confirming that the signal strength of the two communication lines meets the strength requirement based on the average value of the signal strength and the signal strength threshold.
The vehicle charging device confirms that the signal strength of the two communication lines meets the strength requirement based on the average value of the signal strength and the threshold value of the signal strength. The vehicle charging method according to claim 11, comprising: determining whether the average value of the signal strength is lower than a threshold value of the signal strength; if it is determined to be lower, increasing the equivalent capacitance value of the two communication lines by a predetermined amount, and repeating the calculation and determination; and if it is determined to be higher than the average value of the signal strength, the vehicle charging device confirming that the signal strength of the two communication lines meets the strength requirement.
The vehicle charging method according to claim 11, wherein the threshold value of the signal intensity is -31 dB.
The vehicle charging device is connected to a cloud computing platform via a network, and the vehicle charging method is: The vehicle charging device collects characteristic information of the electric vehicle and transmits the characteristic information to the cloud computing platform, The cloud computing platform includes the steps of generating a charging method for the vehicle charging device based on the characteristic information, The vehicle charging method according to claim 10, further comprising the step of charging the electric vehicle based on the charging method.
The vehicle charging method according to claim 10, wherein each of the two communication lines has a first capacitor, each of the two impedance tuners includes at least one branch path, and each of the at least one branch path is connected in parallel to the first capacitor.
The vehicle charging method according to claim 15, wherein each of the at least one branch paths includes a switch and a second capacitor, and the switch and the second capacitor are connected in series.
The vehicle charging method according to claim 16, wherein the switch is configured such that the first capacitor and the second capacitor form a parallel circuit or an open circuit based on a control signal from the controller.
The vehicle charging method according to claim 16, wherein the switch is a high-frequency switching element.
The vehicle charging method according to claim 18, wherein the operating frequency range of the high-frequency switching element includes 150 kHz to 30 MHz.
The vehicle charging method according to claim 18, wherein the high-frequency switching element is a chip-type switch having a control terminal and two connection terminals, the second capacitor is connected between one of the two connection terminals and one end of the first capacitor, and the other of the two connection terminals is connected to the other end of the first capacitor.

Description

This invention relates to charging communication technology, and more particularly to vehicle charging devices and vehicle charging methods. As awareness of environmental protection increases, electric vehicles and related infrastructure have become increasingly widespread. During vehicle charging, electric vehicles and charging stations can be interconnected. Once the electric vehicle and charging station complete their charging communication, the charging station supplies power to the electric vehicle's battery. During charging communication, if the bit error rate in data exchange is too high, abnormalities such as the electric vehicle being unable to charge or charging being interrupted may occur. While several charging control technologies exist, further improvements are needed. Figure 1 is a schematic diagram of a vehicle charging system to which an embodiment of the present invention can be applied.Figure 2 is a schematic diagram of the first signal transmission mode of the vehicle charging system shown in Figure 1.Figure 3 is a schematic diagram of the power spectral density distribution of the communication line in the example of the first charging station shown in Figure 2.Figure 4 is a schematic diagram of the power spectral density distribution of the communication line in the example of the second charging station shown in Figure 2.Figure 5 is a schematic diagram of the second signal transmission mode of the vehicle charging system shown in Figure 1.Figures 6(a) and 6(b) are schematic diagrams of the equivalent circuit and insertion loss in the example of the first charging station shown in Figure 5.Figures 7(a) and 7(b) are schematic diagrams of the equivalent circuit and insertion loss in the example of the second charging station shown in Figure 5.Figure 8 is a schematic diagram showing how to acquire the signal strength of multiple signal channels in an example of multiple charging stations shown in Figure 1.Figure 9 is a schematic block diagram of a vehicle charging device according to an embodiment of the present invention.Figure 10 is a schematic diagram of the connection configuration between the switch and the capacitor in the branching path shown in Figure 9.Figure 11 is a flowchart of a vehicle charging method according to an embodiment of the present invention. To make the above-described content, other objectives, features, and advantages of the present invention easier to understand, preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. As shown in Figure 1, in a vehicle charging system 10 (for example, a Combined Charging System (CCS)), a charging station (Electric Vehicle Supply Equipment, EVSE) 11 and an electric vehicle (Electric Vehicle, EV) 12 can be interconnected. For example, the electric vehicle 12 includes vehicles such as scooters and automobiles. The charging connector of the charging station 11 and the inlet of the electric vehicle 12 form a coupler connection (connector connection). When the electric vehicle 12 and the charging station 11 complete the charging communication operation, the charging station 11 supplies power to the battery of the electric vehicle 12. If the controller 13 lacks an effective compatibility control or optimization mechanism, such as adjusting for differences in couplers formed by different charging connectors (e.g., different wire lengths or diameters), the bit error rate (BER) of data exchange may be too high when the coupler is connected. This can lead to insufficient adaptability in data communication compatibility, resulting in abnormalities such as the electric vehicle being unable to charge or charging being interrupted, leading to an unsatisfactory user experience. For example, taking the Power Line Communication (PLC) protocol as an example, during charging communication, the communication mode between the charging station and the electric vehicle may be a full-duplex mode that enables simultaneous bidirectional data transmission between the charging station and the electric vehicle. As shown in Figure 2, in the first signal transmission mode, the vehicle charging system 20 transmits signals to the electric vehicle 22 via the communication line 23 using a transformer 212, with the controller 211 of the charging station 21 using signal lines (e.g., TXOUT_P and TXOUT_N). For example, the communication line 23 may consist of a Control Pilot line CP and a Protective Earth line PE. In this case, if the impedance between the charging station 21 and the electric vehicle 22 is not matched, the signal will be attenuated during communication. For example, the charging station 21 can acquire the signal strength of multiple signal channels between the charging station 21 and the electric vehicle 22 using a sweep method, allowing the charging station 21 to easily acquire the power spectral density profile (PSD profile) of a specific signal. In one application example, Figur