Portable EV Coupling System for Appliance Power
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Solution Overview
Problem
Electric vehicles without the 'power to the box' (PTTB) function cannot independently power appliances configured for household grids, due to the complexity and additional components required for AC voltage stabilization and bidirectional energy transfer.
Innovation Solution
A portable coupling system that connects appliances to electric vehicles, using a vehicle plug compatible with charging ports and an onboard controller to simulate a charging station connection, providing AC voltage matching household grids and stabilizing it, thus enabling island operation without additional vehicle configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated inverter is provided for power to the box function, then AC voltage stabilization and island operating capability are improved, but device complexity and vehicle weight increase
Solution Approach 1:
The coupling system acts as an intermediary device between the electric vehicle and the appliance. It includes a portable inverter and control unit that interfaces with the vehicle's existing charging port, converting DC battery power to stabilized AC output without requiring modifications to the vehicle's internal systems. This mediator approach enables PTTB functionality while keeping the vehicle configuration simple.
Solution Approach 2:
The power to box functionality is segmented into a separate portable coupling system rather than being integrated into the vehicle. The coupling system contains the inverter, control logic, and stabilization circuitry as independent components that connect to the vehicle through the existing charging port, thus avoiding complexity in the vehicle's main system architecture.
2Adaptability or versatility
If a dedicated inverter is provided for power to the box function, then island operating mode capability is improved, but vehicle weight and mass increase
Solution Approach 1:
The portable coupling system serves as an external intermediary that provides the inverter functionality needed for island operating mode. By placing the inverter in the portable coupling system rather than integrating it into the vehicle, the vehicle's weight is not increased, while still achieving the capability to power appliances independently of the grid.
Solution Approach 2:
The inverter functionality is moved from the vehicle dimension to the external coupling system dimension. This dimensional separation allows the vehicle to maintain its original weight characteristics while the portable coupling system provides the necessary AC conversion capability for island operating mode when needed.
3Adaptability or versatility
If bidirectional energy transfer capability is implemented, then vehicle to grid functionality is improved, but device complexity increases
Solution Approach 1:
The coupling system is designed with multi-functionality to handle both charging (grid to vehicle) and discharging (vehicle to grid or vehicle to appliance) operations through a single interface. The control unit automatically manages the bidirectional energy flow based on the operational mode, eliminating the need for separate systems for each function and reducing overall complexity.
Data Source
AI summary
A coupling system includes a vehicle cable having a plug configured to engage a vehicle charging port of a plug-in hybrid or battery electric vehicle, an electrical outlet configured to receive a plug of an AC powered appliance, a voltage converter, an energy store, and a controller configured to provide power from the vehicle charging port to the electrical outlet. The controller may provide a signal to the charging port of a connected electrified vehicle identifying the coupling system as a charging station to enable the electrified vehicle to provide power to the charging port. The controller may control the voltage converter to charge the energy store using power form a connected electrified vehicle. The controller may control the voltage converter and energy store to stabilize power from the vehicle provided to the electrical outlet.