Battery Charger Transformer Segmentation for Power Loss Reduction
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Solution Overview
Problem
Existing battery chargers face inefficiencies due to high electrical losses in large transformers, which are necessary for high current charging but also wasteful during maintenance charging, and using multiple transformers does not significantly mitigate these losses since all transformers remain active.
Innovation Solution
A high-efficiency battery charger design featuring a control circuitry that selectively activates either a main transformer for high current charging or an auxiliary transformer for low current maintenance charging, disconnecting the other transformer to minimize power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large transformer is used to provide high current for charging depleted batteries, then the charging capability is improved, but electrical power loss increases during maintenance charging
Solution Approach 1:
The battery charger system is segmented into two separate transformers: a first transformer optimized for high current charging operations and a second transformer optimized for low current maintenance charging. This segmentation allows each transformer to be appropriately sized for its specific function, eliminating the need to use an oversized transformer for maintenance charging and thereby reducing electrical power losses during float charging operations.
Solution Approach 2:
The system dynamically switches between the first transformer and the second transformer based on the battery's charging state. The control circuitry monitors battery voltage and automatically selects which transformer to activate: the first transformer for depleted batteries requiring high current, and the second transformer for charged batteries requiring only maintenance current. This dynamic adaptation optimizes efficiency across different operating conditions.
2Adaptability or versatility
If multiple transformers are used to provide different current levels, then charging versatility is improved, but device complexity increases
Solution Approach 1:
The control circuitry merges the functionality of multiple transformers into a unified control system. Rather than requiring separate control mechanisms for each transformer, the single control circuitry intelligently manages both transformers, selecting which one to activate based on battery needs. This merging of control functions simplifies the overall system architecture while maintaining the versatility benefits of having multiple transformers available.
Solution Approach 2:
The control circuitry serves multiple functions: it monitors battery voltage, determines charging state, selects the appropriate transformer, and controls the switching between transformers. This multi-functionality consolidates what would otherwise require multiple separate control components, thereby reducing device complexity while maintaining the adaptability benefits of having both high current and low current charging capabilities.
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 reduces overall electrical power loss by using the appropriate transformer for the charging mode, optimizing efficiency across various battery charging scenarios.
Implementation Method 1
a first transformer to produce a charging current and having a first output to couple the charging current to a depleted battery
Implementation Method 2
a second transformer to produce maintenance current lower than the charging current, the second transformer having a second output to couple the maintenance current to a charged battery
Data Source
Figure 1
Figure 2
AI summary
A high efficiency battery charger. The high-efficiency battery charger can include a first transformer to produce a charging current, a second transformer to produce a maintenance current lower than the charging current, a power feed circuit having an input for connection to a power source, and control circuitry configured to detect a depleted battery to cause the power feed circuitry to feed power to the first transformer while disabling the second transformer, and to detect a charged battery to cause the power feed circuitry to feed power to the second transformer while disabling the first transformer.