Dual-Converter Power Supply Control for Mid-Range Efficiency
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Solution Overview
Problem
Existing electric power supply systems experience reduced voltage conversion efficiency in the intermediate region between different current ranges, and there is no effective method to prevent further deterioration of low-voltage batteries.
Innovation Solution
An electric power supply system with a high-voltage and low-voltage battery, and two converters with different rated powers, controlled by a device that switches operation modes based on current ranges to optimize efficiency and prevent low-voltage battery deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only one converter is used for all current ranges, then the device complexity is reduced, but the voltage conversion efficiency deteriorates in intermediate regions
Solution Approach 1:
The patent divides the converter system into multiple segments (first converter and second converter with different rated powers) to handle different current ranges. Each converter operates optimally in its designated range, avoiding the efficiency loss that occurs when a single converter operates in intermediate regions away from its optimal point.
2Adaptability or versatility
If converters operate in intermediate current regions, then the adaptability is improved, but the voltage conversion efficiency deteriorates
Solution Approach 1:
The control device dynamically switches between different converter configurations based on the current range. When output current is in the first range, only the first converter operates; when in the second range, only the second converter operates; and when in the intermediate range, both converters operate simultaneously to maintain high efficiency while adapting to the intermediate current level.
3Loss of energy
If low-voltage battery supplies power in intermediate region, then the voltage conversion efficiency is improved, but the low-voltage battery deterioration accelerates
Solution Approach 1:
The control device monitors the output current and dynamically changes the operating parameters by switching between different converter configurations. When the output current is in the intermediate range, the system transitions from using only the low-voltage battery to using both converters simultaneously, thereby maintaining high voltage conversion efficiency while preventing excessive discharge and deterioration of the low-voltage battery.
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
Enhances voltage conversion efficiency across a wide range of currents and prevents further deterioration of low-voltage batteries by selectively operating converters and managing battery discharge.
Implementation Method 1
a first converter electrically connected between the high-voltage battery and the low-voltage battery, the first converter being configured to perform voltage conversion between the high-voltage battery and the low-voltage battery
Implementation Method 2
a second converter electrically connected between the high-voltage battery and the low-voltage battery, the second converter being configured to perform voltage conversion between the high-voltage battery and the low-voltage battery
Data Source
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AI summary
An electric power supply system includes: a high-voltage battery; a low-voltage battery having a nominal voltage lower than that of the high-voltage battery, the low-voltage battery being electrically connected to a load; a first converter electrically connected between the high-voltage battery and the low-voltage battery, the first converter being configured to perform voltage conversion between the high-voltage battery and the low-voltage battery; a second converter electrically connected between the high-voltage battery and the low-voltage battery, the second converter being configured to perform voltage conversion between the high-voltage battery and the low-voltage battery, the second converter having rated electric power lower than that of the first converter; and a control device that controls operations of the first converter and the second converter. The control device can selectively execute a plurality of operation modes depending on a total value of output currents of the first converter and the second converter.