EV Power Supply System Aggregating Solar and Grid Energy
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Solution Overview
Problem
Existing power supply systems for electric vehicles face challenges in fast charging without increasing the capacity of power conversion, as excess power cannot be efficiently charged, leading to inefficiencies and higher costs due to larger converter sizes.
Innovation Solution
A power supply system with multiple power converting parts and relays, controlled by a controller, aggregates power from solar cells, storage batteries, or fuel cells to efficiently charge electric vehicles without increasing the power conversion capacity, using a configuration that switches relays to route power through different routes for efficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the capacity of the converter is increased to enable fast charging, then the charging speed is improved, but the cost and size of the converter are increased
Solution Approach 1:
The power supply system is divided into multiple independent power converting parts (first power converting part connected to solar cell/storage battery, second power converting part connected to in-house power wiring). Each part operates independently with its own relay, allowing the system to achieve fast charging capacity without requiring a single large-capacity converter.
Solution Approach 2:
The patent combines the output capacities of multiple power converting parts by aggregating their outputs through relay switching. The controller coordinates the relays to connect either the first power converting part or the second power converting part (or both in series/parallel) to the electric vehicle wiring, effectively merging their capacities to achieve fast charging without increasing individual converter sizes.
2Speed
If the capacity of the converter is increased to enable fast charging, then the charging speed is improved, but the cost is increased
Solution Approach 1:
Instead of manufacturing one large-capacity converter, the system uses multiple smaller-capacity converters that can be produced at lower cost. The segmentation allows each converter to be optimized for its specific power source, reducing overall manufacturing complexity and cost while maintaining fast charging capability through aggregation.
Solution Approach 2:
The power converting parts are designed to be multi-functional, capable of operating with different power sources (solar cell, storage battery, in-house power wiring). This universality reduces the need for specialized high-capacity converters for each application, lowering overall system cost while maintaining fast charging capability.
3Speed
If the capacity of the converter is increased, then the charging speed is improved, but the power conversion efficiency in stationary condition is lowered
Solution Approach 1:
The system dynamically switches between different power converting parts and connection configurations based on real-time conditions. The controller monitors the state of each power source and selectively activates the appropriate relay connections, allowing the system to operate at optimal efficiency levels for stationary conditions while maintaining the capability for high-speed charging when needed.
Solution Approach 2:
The system changes operational parameters by switching between different power converting parts with different capacity ratings. When fast charging is not required, the system can operate with smaller-capacity converters at higher efficiency points. When fast charging is needed, the system aggregates multiple converters or switches to higher-capacity configurations, temporarily accepting reduced efficiency for the duration of the charging event.
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
Enables fast charging of electric vehicles by aggregating power from various sources, reducing the need for increased power conversion capacity and maintaining efficiency, thus minimizing equipment size and cost.
Implementation Method 1
a first power converting part which is connected to a solar cell to convert power supplied from the solar cell
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A power supply system comprises: PV DC/DC converter which converts power supplied from the solar panel; EV DC/DC converter which can convert power supplied from the house side bus and supply the power to an electric vehicle; an in-house relay; a fast charging and discharging relay; a joint part; and a controller which turns the in-house relay off and at the same time turns the fast charging and discharging relay on to cause an aggregated power of the power converted by the EV DC/DC converter and the power supplied to the joint part via a fast charging and discharging route to be outputted to the electric vehicle via the electric vehicle wiring.