Wireless Charging Power Dynamic Balance Control System for Electric Vehicles

Abstract

The present invention discloses a wireless charging power dynamic balance control system for electric vehicles, characterized in that: it includes a plurality of energy transmitting coils arranged corresponding to charging positions, each energy transmitting coil is correspondingly configured with an inverter, the front ends of the plurality of inverters are connected in a DC-DC dynamic matrix module, a three-phase power supply is paralleled to supply power to the DC-DC dynamic matrix module after passing through a multi-channel PFC converter, the three-phase power supply also supplies power to a power transmission control module after passing through a rectification module, the power transmission control module obtains the charging demand information of each charging position through an intelligent charging platform, and controls the output states of the DC-DC converters in the DC-DC dynamic matrix module according to the charging demand information, so as to achieve wireless charging power dynamic balance control. The effect is that it can dynamically adjust the output power of each charging position according to the number of currently connected users, so as to improve the charging rate as much as possible on the premise of meeting the standard charging time and ensure fast charging for each user.

Description

Technical Field

[0001] The present invention relates to wireless charging technology, and more particularly to a dynamic power balance control system for wireless charging of electric vehicles. Background Art

[0002] The intelligent management system of the charging platform involves multiple disciplines such as power electronics technology, embedded technology, microcomputer principle and interface, database management, data processing and mining, image recognition, wireless communication, Internet technology, vehicle networking technology, operations research, computer software programming technology, and network operation. It is a complex system project combining software and hardware.

[0003] Wireless charging of electric vehicles realizes energy transmission under non - electrical connection conditions. As Figure 1 shown, usually a transmitting coil is set at a preset charging position, and a receiving coil is configured on the chassis of the electric vehicle. Using the principle of electromagnetic induction, wireless charging is realized. The circuit principle of the system is as Figure 2 shown, mainly including a power transmitting part and a power receiving part. The power transmitting part is composed of a PTC (power transmission control) unit and an inverter. The power receiving part is composed of rectification, DC / DC conversion, and a power electronics charging control module, which converts the magnetic energy stored in the air gap into electrical energy to charge the charging battery pack.

[0004] Defects of the prior art are:

[0005] Existing electric vehicle charging sites often have multiple charging positions, and each charging position often has an independent set of charging control systems, resulting in high hardware investment costs. Moreover, the infrastructure part at the grid access end is linearly superimposed according to the maximum power. However, often in the same time period, not every parking space has a charging demand, and not every charging space needs the maximum output power, thus resulting in system redundancy and the charging efficiency being difficult to reach the optimal operating state. Summary of the Invention

[0006] To solve the above - mentioned technical problems, the present invention provides a dynamic power balance control system for wireless charging of electric vehicles, which dynamically regulates the output power of each charging space through a dynamic power distribution method to achieve optimal control of the charging efficiency.

[0007] To achieve the above object, the specific technical solutions adopted by the present invention are as follows:

[0008] A wireless charging power dynamic balance control system for an electric vehicle, the key lies in: including a plurality of energy emission coils arranged corresponding to charging parking spaces, each energy emission coil is correspondingly configured with an inverter, the front ends of the plurality of inverters are connected in a DC-DC dynamic matrix module, a three-phase power supply is paralleled to supply power to the DC-DC dynamic matrix module after passing through a multi-channel PFC converter, the three-phase power supply also supplies power to a power transmission control module after passing through a rectification module, the power transmission control module obtains the charging demand information of each charging parking space through an intelligent charging platform, and controls the output states of each DC-DC converter in the DC-DC dynamic matrix module according to the charging demand information, so as to realize wireless charging power dynamic balance control.

[0009] Optionally, the charging demand information of each charging parking space includes user level, remaining battery power, desired charging coefficient, full charge, and maximum power acceptable by the battery.

[0010] Optionally, the power transmission control module changes the average charging rate according to the user level.

[0011] Optionally, the power transmission control module calculates according to to determine the standard charging time of the i-th user, where C i,D represents the actual charging demand power of the i-th user, V i,a represents the average charging rate matched according to the user level of the i-th user, SOC is the remaining battery power, μ is the desired charging coefficient, C i,A is the full charge of the i-th user.

[0012] Optionally, the power transmission control module, according to the number of users to be charged and their corresponding charging demand information, when the number of connected users changes, first calculates whether the output power corresponding to each charging parking space exceeds the system power threshold according to the current charging demand information of each user. If it exceeds, it controls the user who applied to connect last to be in a waiting state. If it does not exceed, it equally distributes the power redundancy level by level according to the user priority level, and controls the average charging rate of the corresponding charging parking space according to the final power distribution data.

[0013] Optionally, the output power of the corresponding charging parking space after the power transmission control module performs power distribution is less than the maximum power acceptable by the battery of the corresponding user.

[0014] Optionally, the power transmission control module changes the output power of the corresponding charging parking space by changing the number of output ports of the corresponding inverter connected to the DC-DC dynamic matrix module.

[0015] The remarkable effect of the present invention is:

[0016] The present invention provides a dynamic balance control system for the wireless charging power of electric vehicles, which can dynamically adjust the output power of each charging space according to the number of currently connected users, so as to improve the charging rate as much as possible on the premise of meeting the standard charging time and ensure fast charging for each user. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0018] Figure 1 is a topological structure diagram of an electric vehicle wireless charging system in the prior art;

[0019] Figure 2 is a circuit principle block diagram of an electric vehicle wireless charging system in the prior art;

[0020] Figure 3 is the system circuit schematic diagram in a specific embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0023] As Figure 3As shown in the figure, this embodiment provides a dynamic balance control system for the wireless charging power of an electric vehicle, which includes a plurality of energy transmitting coils arranged corresponding to charging positions. Each energy transmitting coil is correspondingly configured with an inverter. The front ends of the plurality of inverters are connected to a DC-DC dynamic matrix module. The three-phase power supply is paralleled to supply power to the DC-DC dynamic matrix module through a multi-channel PFC converter (power factor converter). The three-phase power supply also supplies power to the power transmission control module through a rectification module. The power transmission control module obtains the charging demand information of each charging position through an intelligent charging platform, and controls the output states of the DC-DC converters in the DC-DC dynamic matrix module according to the charging demand information, so as to achieve dynamic balance control of the wireless charging power.

[0024] During specific implementation, the charging demand information of each charging position includes user level, remaining battery power, expected charging coefficient, full charge amount, and the maximum power acceptable to the battery. The power transmission control module can change the average charging rate of the corresponding user through the user level.

[0025] Specifically, the power transmission control module calculates according to to determine the standard charging time of the i-th user, where C i,D represents the actual charging demand power of the i-th user, V i,a represents the average charging rate matched according to the user level of the i-th user, SOC is the remaining battery power, μ is the expected charging coefficient, and C i,A is the full charge amount of the i-th user.

[0026] During specific implementation, the power transmission control module calculates the output power corresponding to each charging position according to the number of users to be charged and their corresponding charging demand information. When the number of connected users changes, it first calculates whether the output power corresponding to each charging position exceeds the system power threshold according to the current charging demand information of each user. If it exceeds, it controls the last user who applied to connect to be in a waiting state. If it does not exceed, it equally distributes the power redundancy level by level according to the user priority level, and controls the average charging rate of the corresponding charging position according to the final power distribution data. To prevent overcharging, the output power of the corresponding charging position after the power transmission control module performs power distribution is less than the maximum power acceptable to the battery of the corresponding user.

[0027] As a way of power regulation, the power transmission control module changes the output power of the corresponding charging position by changing the number of output ports of the corresponding inverter connected to the DC-DC dynamic matrix module.

[0028] As can be seen from the above design, three-phase electricity enters the DC-DC matrix through a three-way PFC converter. The intelligent charging platform controls the number of DC-DC converters connected or disconnected in the DC-DC matrix according to information such as user levels and vehicle requirements, so as to distribute power to each charging bay. The power output control module (PTC) and the transformer part are designed in hardware according to the maximum power output. Therefore, each bay has the ability to output the maximum power. When the charging station is idle, it can ensure that a small number of charging bays output at full power, and the other charging bays do not output, for fast charging of vehicles; when it is busy, it ensures the charging needs of a small number of high-level users, and the remaining power is evenly distributed to the bays of ordinary users, achieving the maximum utilization rate of the charging bays in the charging station.

[0029] The system power distribution status is updated in real time according to the change in the number of connected users, so that the charging time of the system will not exceed the standard charging time of each user, and at the same time, the charging rate can be improved as much as possible within the standard charging time range.

[0030] Finally, it should be noted that the above-disclosed technical solutions are only a preferred embodiment of the present invention. Of course, the scope of the rights of the present invention cannot be limited by this. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. A dynamic balance control system for wireless charging power of an electric vehicle, characterized in that: It includes a plurality of energy emission coils provided corresponding to charging spaces. Each energy emission coil is correspondingly configured with an inverter. The front ends of the plurality of inverters are connected in a DC-DC dynamic matrix module. A three-phase power supply is paralleled to supply power to the DC-DC dynamic matrix module after passing through a multi-channel PFC converter. The three-phase power supply also supplies power to a power transmission control module after passing through a rectification module. The power transmission control module obtains the charging demand information of each charging space through an intelligent charging platform, and controls the output states of the DC-DC converters in the DC-DC dynamic matrix module according to the charging demand information to achieve dynamic balance control of wireless charging power; The charging demand information of each charging space includes user level, remaining battery power, desired charging coefficient, full charge amount, and maximum power acceptable to the battery; the power transmission control module changes the average charging rate according to the user level; The power transmission control module is in accordance with to determine the standard charging time of the i-th user, where C i,D represents the actual charging demand power of the i-th user, and V i,a represents the average charging rate matched according to the user level of the i-th user, SOC is the remaining battery power, μ is the desired charging coefficient, and C i,A is the full charge of the i-th user.

2. The dynamic balance control system for the wireless charging power of an electric vehicle according to claim 1, wherein: The power transmission control module, according to the number of users to be charged and their corresponding charging demand information, when the number of connected users changes, first calculates whether the output power corresponding to each charging space exceeds the system power threshold according to the current charging demand information of each user. If there is an excess, it controls the user who applied to connect last to be in a waiting state. If not, it evenly distributes the power redundancy level by level according to the user priority level, and controls the average charging rate of the corresponding charging space according to the final power distribution data.

3. The dynamic balance control system for the wireless charging power of an electric vehicle according to claim 2, wherein: After the power transmission control module performs power distribution, the output power of the corresponding charging space is less than the maximum power acceptable to the battery of the corresponding user.

4. The dynamic balance control system for the wireless charging power of an electric vehicle according to any one of claims 1-3, characterized in that: The power transmission control module changes the output power of the corresponding charging space by changing the number of output ports of the corresponding inverter connected to the DC-DC dynamic matrix module.

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