EV Charging Station Buffer Switching for Reliable Home Backup Power
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Solution Overview
Problem
Existing electric vehicle charging systems with buffer batteries for powering domestic electric grids during power outages are unreliable due to battery deterioration, leading to a failure in V2H/V2B mode when the buffer battery is empty or degraded, leaving the domestic electric grid without power.
Innovation Solution
A power supply system using an electric vehicle with a battery, a charging station, and a buffer energy storage, such as a capacitor, that switches between two supply modes: a second mode for recharging the buffer storage using energy from the vehicle battery and a first mode for powering the domestic grid, ensuring continuous power even when the buffer storage is depleted or degraded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a buffer battery is used in the charging station to enable V2H/V2B mode, then the system can power the domestic electric grid during power outages, but the buffer battery deteriorates over time and becomes unreliable when empty or degraded
Solution Approach 1:
The patent extracts the buffer energy storage function from the chemical battery and implements it using a capacitor instead. This separates the buffering function from the deteriorating battery, allowing the system to maintain reliability without suffering from battery degradation over time.
Solution Approach 2:
The patent changes the physical parameter of the buffer energy storage from chemical (battery) to electrical (capacitor). This parameter change eliminates the deterioration issue while maintaining the energy buffering capability needed for reliable power supply during outages.
2Reliability
If a buffer battery is used to enable V2H/V2B mode, then backup power can be provided during grid failures, but the system becomes complex and expensive
Solution Approach 1:
The patent removes the complex chemical battery system and replaces it with a simpler capacitor-based buffer. This extraction of the buffering function to a simpler component reduces device complexity while maintaining backup power capability.
Solution Approach 2:
The patent uses a capacitor instead of an expensive, long-lifespan battery. Although capacitors have different characteristics, they provide the necessary buffering function at lower cost and complexity, eliminating the need for expensive battery systems.
3Reliability
If a buffer battery is used for V2H/V2B mode, then the electronic control circuit can be powered during outages, but the buffer battery may be depleted leaving the system without power
Solution Approach 1:
The patent implements a dual-mode system where the electric vehicle battery can continuously recharge the capacitor buffer. This ensures the buffer never remains depleted, maintaining continuous power availability for the control circuit and eliminating the risk of complete energy exhaustion.
Solution Approach 2:
The system preliminarily charges the capacitor buffer from the electric vehicle battery before power outages occur. This preliminary action ensures the buffer is ready to immediately power the control circuit when needed, without risking depletion.
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
Ensures reliable and continuous power supply to domestic electric grids during power outages by leveraging the electric vehicle's battery energy, using a capacitor-based buffer storage that is less expensive and compact, maintaining power delivery without interruptions.
Implementation Method 1
A power supply system using an electric vehicle with a battery, a charging station, and a buffer energy storage, such as a capacitor
Data Source
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Figure 3~4
AI summary
The present invention concerns a method for controlling a vehicle charging station for powering a domestic electric grid, more particularly a house/building domestic electric grid, connected to said vehicle charging station, in a context of powering the domestic electric grid without any power grid or with a power grid failure, the method using a power supply system comprising at least a power assembly comprising an electric vehicle, an electric vehicle charging station (2), which charging station (2) comprises a buffer energy storage (2b), wherein the method comprises the following steps for controlling the charging station (2) : initiating powering and recharging of the buffer energy storage (2b) with electrical energy stored in the electric vehicle battery using a second supply mode, when the charge level is reached or initially reached, initiating the supply of electrical energy stored in the electric vehicle battery to the domestic electric grid (3) using a first supply mode.