KR-20260066857-A - Bidirectional Charging Control Device for Electric Vehicle Slow Chargers
Abstract
A bidirectional charging control device for a slow electric vehicle charger is provided, characterized by comprising: a bidirectional on-board charger (OBC) that enables battery charging using AC power as a device for charging a high-voltage battery of an electric vehicle; a charger capable of bidirectional (Grid-to-Vehicle, G2V) and (Vehicle-to-Load, V2L) control; and a low-voltage converter (Low DC-DC Converter, LDC) that supplies voltage to a 12V system from a high-voltage battery, which is the main power source of the electric vehicle, to enable the use of a vehicle controller and convenience systems.
Inventors
- 조현규
Assignees
- 국립목포대학교산학협력단
Dates
- Publication Date
- 20260512
- Application Date
- 20241105
Claims (3)
- In a bidirectional charging control device for an electric vehicle slow charger, As a bidirectional on-board charger (OBC), a device for charging a high-voltage battery of an electric vehicle, an on-board power converter that enables battery charging using AC power; and a charger capable of bidirectional (Grid-to-Vehicle, G2V) and (Vehicle-to-Load, V2L) control; and A power conversion device acting as a low-voltage converter (Low DC-DC Converter, LDC) that supplies voltage from a high-voltage battery, which is the main power source of an electric vehicle, to a 12V system to enable the use of vehicle controllers and convenience systems; A bidirectional charging control device for an electric vehicle slow charger, characterized by including
- In paragraph 1, The above-mentioned bidirectional charging control device for an electric vehicle slow charger is, A bidirectional charging control device for an electric vehicle slow charger, characterized by being implemented as a bidirectional (G2V and V2L) vehicle charger control device with an integrated 20 kW or higher class OBC and 4 kW or higher class LDC capable of single-phase/three-phase operation and having a high power density of 2 kW/L or higher.
- In paragraph 2, The above OBC includes a control function according to a predetermined control algorithm, The above control algorithm is, As a first algorithm, a charging algorithm for reducing voltage and current ripple, As a second algorithm, a modeling-based DC/DC control algorithm, As a third algorithm, it includes a control algorithm robust to battery voltage fluctuations, The first algorithm above includes AC/DC Boost PFC Converter dynamic modeling; a three-phase/single-phase modeling-based PFC algorithm, and The second algorithm above includes a control algorithm robust to constant uncertainty and change; a simulator for verifying the G2V charging control algorithm; and a control algorithm robust to constant uncertainty and change. A bidirectional charging control device for an electric vehicle slow charger, characterized in that the above-mentioned third algorithm includes a DC-DC converter control algorithm robust to advanced control-based battery voltage fluctuations and an overall system integrated control algorithm that considers the AC/DC converter and the DC/DC converter.
Description
Bidirectional Charging Control Device for Electric Vehicle Slow Chargers The present invention relates to electric vehicle charging technology, and more specifically, to a bidirectional charging control device for an electric vehicle slow charger. As emission regulations become stricter worldwide, the electric vehicle industry is developing rapidly. Korea is also increasing support for eco-friendly vehicles and expanding the use of eco-friendly automobiles, including the supply of 1.13 million electric vehicles and 200,000 hydrogen vehicles. According to the Ministry of Land, Infrastructure and Transport, the number of registered diesel vehicles in Korea in 2023 was 9,500,164, a 2.6% decrease compared to 2022. Sales volume declined not only domestically but also overseas. According to the overseas automotive media outlet JustAuto, the market share of diesel vehicles in Europe last year was in the 15% range of total sales, showing a slight decrease compared to the previous year. Sales of diesel vehicles decreased in most European countries excluding Germany, while sales of eco-friendly vehicles such as plug-in hybrids and electric vehicles increased significantly. Therefore, due to the decline in the market share of diesel vehicles, there is a need to shift the business sector and products of diesel vehicle-related parts manufacturers, and the importance of OBCs (On-board Chargers) is growing recently, replacing the existing DPFs (Diesel Particulate Filters). In particular, there is increasing demand for bidirectional (G2V and V2L) chargers that are compatible with both single-phase and three-phase systems and integrate an LDC (Low DC-DC Converter). Furthermore, as the level of autonomous driving gradually increases and the number of sensors used within vehicles grows, the load on the vehicle's electrical system is increasing; therefore, there is a need to increase LDC capacity. FIG. 1 is a drawing for explaining a bidirectional charging control device for an electric vehicle slow charger according to an embodiment of the present invention. FIG. 2 is a block diagram of a 22kW bidirectional OBC. The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. In describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such descriptions may unnecessarily obscure the essence of the invention. Furthermore, numbers used in the description of this specification (e.g., first, second, etc.) are merely identifiers to distinguish one component from another. Furthermore, throughout the specification, when a component is referred to as being "connected" or "joined" with another component, it should be understood that the component may be directly connected or joined to the other component, but unless specifically stated otherwise, it may also be connected or joined through an intermediate component. Additionally, throughout the specification, when a part is described as "including" a component, unless specifically stated otherwise, this means that it does not exclude other components but may include additional components. Furthermore, terms such as "part" or "module" as used in the specification refer to a unit that processes at least one function or operation, and this implies that it may be implemented by one or more hardware or software, or a combination of hardware and software. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a drawing for explaining a bidirectional charging control device for an electric vehicle slow charger according to an embodiment of the present invention, and FIG. 2 is a block diagram relating to a 22kW bidirectional OBC. The OBC installed inside the electric vehicle is a core component of the electric vehicle, and as the adoption of electric vehicles expands, power electronic components related to electric vehicle charging are becoming increasingly important. Furthermore, V2G (Vehicle to Grid) and V2L (Vehicle to Load) technologies utilizing vehicle batteries will bring significant changes to the power grid in the future, as they create a new power trading market based on electricity rate arbitrage over time. In particular, as the camping and outdoor population increases rapidly, electricity can be used from the vehicle's main battery even in remote areas, and this can be expanded into a virtual power plant concept where the electric vehicle is used as a small power plant to supply electricity to areas facing severe power shortages if necessary. In other words, overall, it can be expected t