Battery Module Voltage Control for Smooth Power Transfer
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Solution Overview
Problem
Existing power supply systems with battery modules face voltage variations when the power source switches from commercial power to battery supply, leading to unstable direct-current voltage applied to loads due to rapid changes in output current.
Innovation Solution
A battery module with a DC-DC converter and controller that adjusts output voltage before receiving a stop warning signal to be lower than the target voltage, then increases it to the target voltage or higher after the signal, reducing voltage variation by controlling the increasing rate of current from the battery module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the battery module performs constant voltage control to maintain the direct-current voltage at the target value, then the voltage stability is improved, but the response speed to rapid current changes deteriorates
Solution Approach 1:
The controller receives a stop warning signal in advance before the power supply stops outputting voltage. Using this advance notice, the controller proactively increases the output voltage of the DC-DC converter to the target voltage or higher before the power transition occurs. This preliminary action ensures that when the power supply stops, the battery module is already at the correct voltage level, preventing voltage drops and maintaining stability without needing to respond rapidly after the fact.
Solution Approach 2:
The controller dynamically adjusts the output voltage of the DC-DC converter based on the operational state. Before receiving the stop warning signal, the output voltage is maintained lower than the target voltage. Upon receiving the signal, the controller transitions to increasing the voltage to the target value or higher, and after the power supply stops, maintains the voltage at the target value. This dynamic adjustment strategy optimizes both response speed and voltage stability at different stages of the power transition.
2Productivity
If the battery module rapidly increases output current to follow the power supply stop, then the power delivery speed is improved, but the voltage variation increases
Solution Approach 1:
The controller uses the stop warning signal to proactively increase the output voltage of the DC-DC converter to the target voltage or higher before the power supply stops. This preliminary voltage adjustment ensures that when the power transition occurs, the battery module is already positioned to deliver power at the correct voltage level, eliminating the need for rapid current increases that would cause voltage variations.
Solution Approach 2:
The controller changes the output voltage parameter of the DC-DC converter based on the operational phase. Before the stop warning signal, the voltage is kept lower than the target voltage. Upon receiving the signal, the voltage parameter is adjusted to the target voltage or higher. After the power supply stops, the voltage is maintained at the target value. This parameter change strategy allows smooth power transition without rapid current changes, thereby preventing voltage variations while maintaining power delivery capability.
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 approach stabilizes the voltage applied to the load by gradually increasing the current from the battery module, reducing voltage variations and maintaining a constant voltage during the power transition, thus ensuring stable power supply.
Implementation Method 1
a DC-DC converter to convert a direct-current voltage that is output from the battery and thereafter output the direct-current voltage to the load
Data Source
AI summary
A battery module includes a battery, a bidirectional DC-DC converter, and a controller. The bidirectional DC-DC converter may convert a direct-current voltage output from the battery and thereafter output the direct-current voltage to a load. The controller is configured or programmed to perform constant voltage control of the bidirectional DC-DC converter and receive a stop warning signal providing advance notice that output of a power supply is to stop. The controller is configured or programmed to, before receiving the stop warning signal, perform control such that an output voltage of the bidirectional DC-DC converter is lower than a first target voltage, and, after receiving the stop warning signal and before the output of the power supply stops, increase the output voltage of the bidirectional DC-DC converter to the first target voltage or higher.