Multi-Source DC Power Supply Mode Selection
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Solution Overview
Problem
Existing power supply systems with multiple DC power sources lack detailed methods for selecting operation modes to maximize efficiency and protect against overcharge and overdischarge, leading to inefficiencies and potential damage to power supplies.
Innovation Solution
A power supply system with a control device that selects operation modes for a power converter connected across multiple DC power supplies, using switching elements and reactors to manage power distribution and voltage conversion, ensuring efficient operation and protection by setting request voltages and adjusting modes based on State of Charge (SOC) and power restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a power converter with multiple operation modes is used to minimize power loss, then overall system efficiency is improved, but the complexity of selecting and controlling operation modes increases
Solution Approach 1:
The control device continuously monitors the operating conditions of multiple DC power supplies and uses feedback signals to dynamically select the most appropriate operation mode for the power converter. This closed-loop control ensures minimal power loss while managing the complexity through automated decision-making based on real-time system state
Solution Approach 2:
The power converter is designed with multiple operation modes that can be dynamically switched based on the operating conditions of the DC power supplies. The system transitions between different conversion topologies (e.g., buck, boost, buck-boost modes) to optimize efficiency under varying load and voltage conditions
2Loss of energy
If operation modes are selected to maximize efficiency, then power loss is reduced, but the risk of overcharge and overdischarge of DC power supplies increases
Solution Approach 1:
The control device monitors the State of Charge (SOC) and voltage levels of each DC power supply in real-time and uses this feedback to adjust operation mode selection. When a power supply approaches overcharge or overdischarge conditions, the control algorithm modifies its decisions to prevent these harmful states while maintaining overall system efficiency
Solution Approach 2:
The control device takes preliminary protective actions by predicting when DC power supplies may reach overcharge or overdischarge conditions and adjusts operation modes in advance to prevent these states. This proactive approach prevents damage before it occurs while minimizing efficiency losses
3Power
If multiple DC power supplies are used to increase power capacity, then the system can handle higher loads, but the difficulty of managing power distribution and protecting each supply increases
Solution Approach 1:
The control device is designed as a universal controller that can manage multiple types of DC power supplies with different characteristics (voltage, capacity, charge/discharge rates). It performs multiple functions including operation mode selection, power distribution optimization, and protection of individual supplies, thereby managing the complexity of high-capacity multi-supply systems
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 simultaneously enhances overall efficiency and protects each DC power supply from overcharge and overdischarge by dynamically selecting operation modes that minimize power loss and optimize power distribution.
Implementation Method 1
The power converter is configured to include a plurality of switching elements and to execute DC/DC conversion in a plurality of different conversion topologies
Data Source
AI summary
An operation mode selection unit selects an efficiency priority mode for minimizing the overall loss in a power supply system based on a load request voltage obtained in accordance with the condition of a load and on the conditions of DC power supplies, and generates a mode selection signal in accordance with the selection result. When SOC and/or output power have/has reached power supply restriction values in any DC power supply, an operation mode modification unit generates a final mode selection instructing signal so as to modify selection of the efficiency priority mode by the mode selection signal to select an operation mode in which power distribution between the DC power supplies can be controlled.