Power Supply System with Single Converter for Multiple Storage Devices
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Solution Overview
Problem
Existing power supply systems for electric vehicles face inefficiencies due to increased power loss and size/cost when multiple power storage devices are used, as each device requires a converter for independent charge/discharge control, leading to a need for a mechanism to effectively utilize multiple devices while maintaining variable DC voltage control.
Innovation Solution
A power supply system with a first and second power storage device, a power line, a converter for bidirectional DC voltage conversion, and a switch controlled by a device that performs voltage or current control based on the switch's ON/OFF state, using integral feedback control elements to manage voltage and current deviations, allowing cooperative use of multiple devices to supply power efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a converter is provided for each power storage device to enable independent charge and discharge control, then the ability to independently control charge and discharge of each power storage device is improved, but the number of converters increases leading to increased power loss, system size, and cost
Solution Approach 1:
The patent merges multiple power storage devices into a single controllable unit by providing only one converter. The control device manages charge and discharge operations for multiple power storage devices through this single converter, eliminating the need for separate converters for each device. This reduces the total number of converters, thereby decreasing power loss, system size, and cost while maintaining independent control capability through intelligent power management.
Solution Approach 2:
The single converter is designed to serve multiple power storage devices simultaneously, making it a multi-functional component. The converter can switch between different power storage devices and perform both charging and discharging operations for each device as needed. This universal approach allows one converter to replace what would traditionally require multiple dedicated converters, reducing system complexity and energy loss.
2Duration of action of moving object
If the number of power storage devices is increased to extend vehicle mileage, then the charge and discharge capacity is improved, but the number of converters must also increase leading to increased system size and cost
Solution Approach 1:
The patent combines multiple power storage devices into a unified system managed by a single converter. Instead of adding a converter for each additional power storage device to extend mileage, the system uses one converter to manage all power storage devices collectively. This approach allows the system to scale its energy capacity without proportionally increasing converter数量, thereby extending vehicle mileage while controlling system size and cost.
Solution Approach 2:
The control device autonomously manages the charge and discharge operations of multiple power storage devices through the single converter. The system self-regulates power flow distribution among multiple power storage devices based on their individual states and system requirements, eliminating the need for additional control hardware for each device. This self-service capability allows the system to handle multiple power storage devices with minimal additional complexity.
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
This configuration enables efficient power supply to a load using multiple power storage devices with fewer converters, reducing system size and cost while maintaining effective control of DC voltage, thereby extending vehicle mileage.
Implementation Method 1
a converter (110) for executing bidirectional DC voltage conversion between the first power storage device (100) and the power line (HPL)
Data Source
Figure 1
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Figure 4
AI summary
A power supply system (20) that supplies electric power to a load (10) includes a first power storage device (100), a second power storage device (150), a power line (HPL) for transmitting electric power input and output to and from the load (10), a converter (110) for executing bidirectional DC voltage conversion between the first power storage device (100) and the power line (HPL), and a switch (RL1) connected between the second power storage device (150) and the power line (HPL). When the switch (RL1) is OFF, the control device (300) performs voltage control of the converter (110) so that a voltage value of the power line (HPL) becomes a voltage command value, and when the switch (RL1) is ON, the control device (300) performs current control of the converter (110) so that a current value of the first power storage device (100) becomes a current command value.