Transformer Conversion Circuit for Battery Voltage Balancing
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Solution Overview
Problem
Existing power storage systems require large capacitors to manage voltage balancing between battery units, leading to increased size and cost due to high ripple currents.
Innovation Solution
A conversion device with multiple conversion circuits and transformers that allow for separate charging and discharging paths for battery units, reducing voltage differences while minimizing capacitor load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If voltage balancing processing is performed using a primary switching circuit and capacitor, then the potential difference between battery modules is reduced, but large ripple current flows through the capacitor requiring high-capacity capacitors
Solution Approach 1:
The patent introduces a bidirectional DC-DC converter as an intermediary device between battery modules to perform voltage balancing. This converter acts as a mediator that can transfer energy bidirectionally between modules, eliminating the need for large capacitors while achieving precise voltage balancing through controlled power conversion rather than direct capacitor-based equalization.
Solution Approach 2:
The patent changes the operating parameters of the power conversion system by using bidirectional DC-DC converters that can operate in different modes (boost, buck, or bidirectional). This allows the system to adaptively adjust power flow directions and magnitudes to achieve voltage balancing with minimal capacitor requirements, transforming the voltage balancing approach from passive capacitor-based to active converter-based control.
2Reliability
If large-capacity capacitors are provided to handle ripple current during voltage balancing, then voltage balancing can be performed, but device size and cost increase
Solution Approach 1:
The bidirectional DC-DC converter serves as an intermediary that handles the energy transfer during voltage balancing, replacing the need for large energy-storing capacitors. The converter's controlled power conversion capability provides the necessary voltage balancing function with much smaller passive components, reducing overall system volume while maintaining reliability.
Solution Approach 2:
The patent replaces the mechanical/electrical capacitor-based voltage balancing system with an electronic power conversion system. By using bidirectional DC-DC converters with controlled switching and power management, the system achieves voltage balancing through electronic control rather than relying on large physical capacitors, thereby reducing size while maintaining functionality.
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 device effectively reduces voltage differences between battery units without overburdening capacitors, thus minimizing size and cost implications.
Implementation Method 1
a plurality of transformers in each of which a first coil that is connected to the AC ends of a corresponding one of the plurality of first conversion circuits is magnetically coupled to a plurality of second coils
Data Source
AI summary
In a conversion device, a second conversion circuit may be connected to a second coil of a transformer to perform bidirectional power conversion. Another second conversion circuit may be connected to a second coil of another transformer to perform bidirectional power conversion. A third conversion circuit may convert AC power input to another second coil of the transformer to DC power and output the DC power to a common path. Another third conversion circuit may convert AC power input to another second coil of the other transformer to DC power and output the DC power to the common path.