Series-Connected DC-DC Converter Modules for Current Balancing
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Solution Overview
Problem
Existing electronic devices using module-type DC-DC converters face challenges in maintaining current balancing among converters connected in parallel, leading to inefficiencies and increased manufacturing costs.
Innovation Solution
The electronic device incorporates a configuration where the secondary windings of transformers in the first and second converters are connected in series, along with control circuitry that adjusts output voltage based on the detection of the second converter, ensuring balanced current and voltage distribution without additional hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If module-type converters are connected in parallel to increase power capacity, then the power supply capacity is improved, but current balancing among converters deteriorates
Solution Approach 1:
The patent inverts the conventional parallel connection approach by connecting the secondary windings of multiple converters in series instead of parallel. This inversion fundamentally changes the current flow characteristics, allowing each converter to operate at its rated current while collectively providing higher power capacity, thus solving the current balancing problem inherent in traditional parallel connections
Solution Approach 2:
The patent transitions from the conventional two-dimensional parallel connection (all converters sharing same voltage and current) to a three-dimensional configuration where converters are connected in series on the secondary side. This dimensional change enables independent current control for each converter while maintaining synchronized operation through shared primary winding connection
2Reliability
If additional control hardware is added to maintain current balancing, then the current balancing is improved, but the device complexity increases
Solution Approach 1:
The series connection configuration enables the converters to self-regulate current distribution automatically. The control circuitry utilizes the inherent electrical characteristics of the series-connected secondary windings to maintain current balancing without requiring additional sensors, communication protocols, or complex control algorithms, thus achieving self-service current balancing
Solution Approach 2:
The control circuitry in each converter serves multiple functions: it controls the switching of its own converter, detects the presence and status of other converters in the series chain, and automatically adjusts operating parameters to maintain current balancing. This multi-functionality eliminates the need for dedicated balancing hardware
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 effectively maintains current and voltage balancing among converters, reducing manufacturing costs and enabling flexible implementation of converters as module types, while also allowing for variable power supply configurations.
Implementation Method 1
a first converter including a first transformer and a second transformer of which a primary winding is connected in parallel with a primary winding of the first transformer
Data Source
AI summary
An electronic device and a method of forming the electronic device is disclosed. The electronic device includes a first converter including a first transformer and a second transformer of which a primary winding is connected in parallel with a primary winding of the first transformer; and a second converter of which a primary input is connected in parallel with the first converter, and which includes a third transformer and a fourth transformer of which a primary winding is connected in parallel with a primary winding of the third transformer, wherein a secondary winding included in the first converter may be connected in series with a secondary winding included in the second converter.