PV DC Charging Module That Bypasses EV OBC Power Limits
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Solution Overview
Problem
Existing EV charging systems are limited by the power upper limit of the on-board charger (OBC), resulting in slow charging speeds and high costs, as they require cooperation with the OBC to convert solar energy into electrical energy for charging.
Innovation Solution
A charging module that includes a DC/DC charging component, an inverter, and a control and guide component, which receives electrical energy directly from a photovoltaic interface, allowing for direct current charging of EVs without relying on the OBC, and optionally utilizes energy storage and grid power to reach target charging power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the charging pile uses electrical energy converted from solar energy to charge the EV at high power, then the output power of the charging pile is increased, but the charging pile is limited by the power upper limit of the OBC resulting in low actual charging power and slow charging speed
Solution Approach 1:
The patent extracts the charging function from the OBC-dependent AC charging path and creates an independent DC charging path. The DC/DC charging component directly receives DC power from photovoltaic modules through the photovoltaic interface, bypassing the OBC's power conversion limitations. This separation allows the charging pile to operate at high power without being constrained by the OBC's power upper limit.
2Device complexity
If the charging pile cooperates with the OBC to charge the EV, then the charging system is simpler, but the charging power is limited by the OBC's power upper limit
Solution Approach 1:
The patent segments the charging system into two independent paths: an AC charging path through the OBC and a DC charging path through the DC/DC charging component. The DC path includes a photovoltaic interface directly connected to photovoltaic modules, allowing high-power DC charging without requiring OBC cooperation. This segmentation enables the system to achieve high charging power while maintaining operational simplicity through independent module design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution increases the actual power and charging speed of EVs by bypassing the OBC limitations, reducing charging time and costs while utilizing renewable solar energy and grid power efficiently.
Implementation Method 1
A photovoltaic array is set up in space on a rooftop of a house. The photovoltaic array converts solar energy into electrical energy
Data Source
AI summary
This application provides a charging module and a charging system. The charging system includes a charging module. The charging module includes a direct current-to-direct current (DC/DC) charging component, a functional interface, an inverter, and a control and guide component. The functional interface includes a photovoltaic interface. The DC/DC charging component is configured to receive a first power exported by a photovoltaic module to charge an electric vehicle (EV). In this way, after receiving, through the photovoltaic interface, electrical energy converted from solar energy, the charging module does not need to cooperate with an on-board charger (OBC), but uses the DC/DC charging component to charge the EV with a direct current. The charging module provided in this application is not limited by a charging power of the OBC when charging the EV, thereby increasing an actual power for charging the EV and a charging speed.