DC Power Supply Battery Life Uniformity via Localized Current Control
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Solution Overview
Problem
Existing DC power supplying systems face challenges in maintaining uniform battery life due to manufacturing errors and resistance fluctuations in converters and wiring, leading to uneven charging and discharging cycles among storage batteries with different fully charged capacities.
Innovation Solution
A standalone DC power supplying system with constant current-type bidirectional DC/DC converters that adjust charging and discharging rates based on power differences and DC voltage, using a controller to ensure uniform State Of Charge (SOC) across storage batteries, and a secondary bidirectional converter for voltage stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If CC-type bidirectional DC/DC converters are used to charge and discharge storage batteries with common current values, then the difference in remaining battery level between storage batteries is reduced, but the difference in battery life still occurs when storage batteries have different fully charged capacities
Solution Approach 1:
The patent applies local quality by making each bidirectional DC/DC converter individually adjustable. Instead of using a uniform control strategy for all converters, the controller allows each converter to have its own charging/discharging current value tailored to the specific storage battery's fully charged capacity. This localized adjustment ensures that batteries with different capacities receive appropriate current values, resolving the contradiction between manufacturing uniformity and reliability.
Solution Approach 2:
The patent implements dynamics by making the charging/discharging current values adjustable and adaptable. The controller dynamically determines appropriate current values for each converter based on the storage battery's fully charged capacity. This dynamic adjustment allows the system to adapt to variations in battery characteristics, ensuring uniform battery life despite differences in manufacturing specifications.
2Adaptability or versatility
If storage batteries with different fully charged capacities are connected to the DC bus, then system flexibility is improved, but uniform battery life becomes difficult to maintain
Solution Approach 1:
The patent resolves this contradiction by applying local quality through individualized control of each bidirectional DC/DC converter. Each converter is controlled based on the specific fully charged capacity of its connected storage battery, allowing the system to accommodate batteries with different capacities while maintaining uniform battery life through localized current value adjustments.
Solution Approach 2:
The patent applies parameter changes by adjusting the charging/discharging current values based on the fully charged capacity parameter of each storage battery. The controller modifies the current parameter for each converter according to the battery's capacity, enabling the system to maintain reliability while accepting diverse battery configurations.
3Reliability
If manufacturing errors and wiring resistance fluctuations occur, then system robustness is challenged, but uniform charging/discharging current distribution becomes difficult
Solution Approach 1:
The patent applies feedback by having the controller determine appropriate charging/discharging current values for each converter based on the storage battery's fully charged capacity. This feedback mechanism compensates for manufacturing errors and wiring resistance fluctuations by adjusting the current values to achieve uniform current distribution and uniform battery life despite component variations.
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 significantly reduces fluctuations in battery life by maintaining uniform charging and discharging cycles, even when storage batteries have varying fully charged capacities, thereby extending battery lifespan.
Implementation Method 1
bidirectionally perform voltage conversion between a DC voltage supplied to a DC bus and a DC voltage for a storage battery
Implementation Method 2
supply a constant DC current from the DC bus to a storage battery and from the storage battery to the DC bus
Data Source
AI summary
A standalone direct current (DC) power supplying system, which is not connected to commercial power, includes a power conditioner that supplies generated power W2 of a power generator to a DC bus, DC/DC converters that convert a bus voltage Vbs and supply load power (WLa+WLb) to load appliances, bidirectional DC/DC converters that supply a constant DC current from the DC bus to storage batteries or from the storage batteries to the DC bus, and an energy management system. When the generated power W2 exceeds the load power (WLa+WLb), the energy management system causes the converters to supply a constant DC current with a common charging rate to the storage batteries, and when the generated power W2 falls below the load power (WLa+WLb), the energy management system causes the converters to supply a constant DC current with a common discharging rate from the storage batteries to the DC bus.