Modular DC Power Output Switching for Multi-Voltage EV Charging
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Solution Overview
Problem
Existing power generation systems struggle to efficiently supply power to electric vehicles (EVs) with different battery voltage specifications, leading to increased equipment costs and reduced efficiency.
Innovation Solution
A power generating system comprising multiple power generation modules, each equipped with an engine, a renewable energy-derived fuel supply device, a power generator, an AC/DC converter, and a module power output unit. The modules are connected via parallel and series adjustment switches, allowing for flexible power output and voltage adjustment without the need for DC/DC converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a DC/DC converter is interposed between the DC power supply bus and the EV to supply power to EVs with different voltage specifications, then the adaptability to different voltage specifications is improved, but the device complexity and equipment cost increase
Solution Approach 1:
The power supply system is segmented into multiple independent power supply devices, each capable of outputting different voltage levels. Instead of using a single DC power supply bus with a DC/DC converter, the system divides the power supply function across multiple devices that can be independently controlled to match different EV battery voltage specifications (400V or 800V), thereby eliminating the need for expensive DC/DC converters while maintaining adaptability.
Solution Approach 2:
Each power supply device is designed with multi-functionality to serve multiple purposes: they can independently provide power to EVs with different voltage specifications, and they can also be combined in parallel to supply higher power levels. This universal design allows the same device configuration to adapt to various EV models and charging requirements without requiring additional conversion equipment.
2Loss of energy
If the operating point of the internal combustion engine is adjusted to maintain power generation efficiency when voltage specification and supply power amount differ, then the power generation efficiency is improved, but the adaptability to different power demands is limited
Solution Approach 1:
Multiple power supply devices are merged in parallel to collectively meet diverse power demands. When a single device cannot satisfy the required power level while maintaining efficient operation, additional devices are activated and combined to provide the necessary power. This merging approach allows the system to maintain high efficiency by operating each device at its optimal point while simultaneously adapting to varying power demands through flexible combination configurations.
Solution Approach 2:
The system dynamically adjusts the number of active power supply devices and their output levels based on real-time charging demands. The control unit monitors the required power and voltage specifications, then dynamically activates or deactivates individual devices to match the demand, ensuring each operating device runs at an efficient operating point while the overall system adapts flexibly to different power requirements.
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
The system enables low-cost, high-efficiency power supply to EVs with varying voltage specifications, reducing equipment costs and improving power generation efficiency by allowing flexible power distribution and voltage adjustment.
Implementation Method 1
a plurality of power generation modules 100 each including an engine 200 that combusts fuel to generate power
Implementation Method 2
an AC/DC converter 400 that converts the alternating-current power into direct-current (DC) power
Data Source
AI summary
Provided is a power generating system that is able to supply low-cost and highly efficient power to apparatuses having different battery voltage specifications. This power generating system 1 has a plurality of power generating modules 100 each comprising an engine 200 that burns a fuel to generate electric power; a renewable energy-derived fuel supply device 900 that burns a renewable energy-derived fuel in the engine 200 to generate electric power, a power generator 300 that generates AC power from the electric power of the engine 200; an AC/DC converter 400 that converts the AC power to DC power; and a module power output unit 401 that outputs the DC power. The module power output units 401 adjacent to each other are connected to each other by means of a plurality of parallel adjustment switches 31 that can open and close, the parallel adjustment switches 31 are connected in series, and is provided with a DC power output unit 700 connected to at least one of the module power output units 401 by means of one of a plurality of series adjustment switches 30.