Integrated Power Conversion for PV, Battery, and EV Charging
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Solution Overview
Problem
Existing solar battery charger systems and electric vehicle chargers operate as independent devices with non-uniform communication protocols, leading to difficulties in electricity management, high installation and maintenance costs, and insufficient AC port capacity.
Innovation Solution
A power converting system integrating a power converting device, protection device, and charging device, with multiple input/output ports and a controller for managing power flow, communication, and protection, allowing selection of power sources to meet load demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent sub-systems (PV inverter, battery inverter, EV charger) are used to achieve energy conversion, then energy conversion functionality is provided, but communication coordination becomes difficult due to non-uniform protocols and installation/maintenance costs increase
Solution Approach 1:
The patent combines PV inverter, battery inverter, and EV charger into a single integrated power converting system with a unified controller. This merging eliminates the need for multiple independent devices, standardizes communication protocols, and simplifies system coordination while maintaining all energy conversion functionalities.
Solution Approach 2:
The integrated power converting system performs multiple functions including PV-to-grid conversion, battery charging/discharging, EV charging, and system coordination through a single device. This multi-functionality replaces multiple specialized devices while maintaining adaptability to various energy conversion scenarios.
2Reliability
If each independent system uses separate grid-connected capacity, then system independence is maintained, but AC port capacity becomes insufficient and installation/maintenance costs increase
Solution Approach 1:
The patent merges multiple independent systems into a single integrated unit that shares common components including grid connection interface, control system, and protection devices. This reduces the number of AC ports required and consolidates installation and maintenance activities into a single system.
3Adaptability or versatility
If multiple independent devices are deployed, then specific functions are achieved, but thermal management efficiency decreases due to distributed heat generation
Solution Approach 1:
The patent integrates PV conversion, battery management, and EV charging functions into a single physical system. This consolidation allows for centralized thermal management where heat from all components can be managed through unified cooling systems, improving overall thermal efficiency compared to distributed independent devices.
Data Source
AI summary
A power converting system includes a power converting device, a protection device, and a charging device. The power converting device is coupled to a first and a second power source. The protection device is coupled to the power converting device, a load, and a grid, and switches electrical connections among the power converting device, the load, and the grid. The charging device is coupled to the power converting device and a third power source. The power converting device charges the third power source through the charging device, or receives electricity through the charging device. Select at least one power source of the first power source, the second power source, the third power source and the grid to provide electricity to the load according to multiple preset modes.