Bidirectional DC-DC Converter with Segmented Windings
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Solution Overview
Problem
Existing bidirectional DC-DC converters have limited voltage range due to transformer turn ratios, requiring additional circuits for voltage increase and restricting boost voltage to specific limits, and cannot efficiently decrease voltage below a certain threshold.
Innovation Solution
A bidirectional DC-DC converter design that includes multiple transformers and switches, allowing for series and parallel connections of windings, along with phase and pulse-width control, to expand the voltage range and reduce the number of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bidirectional DC-DC converter uses a transformer with a fixed turn ratio to convert voltage, then the voltage conversion is straightforward, but the voltage range is limited and cannot exceed the limits imposed by the turn ratio
Solution Approach 1:
The patent divides the secondary winding into multiple independent winding sections (first secondary winding, second secondary winding, third secondary winding) with different turn ratios relative to the primary winding. This segmentation allows the converter to select different voltage conversion ratios by switching between different secondary windings, thereby expanding the voltage range without requiring multiple separate transformers or complex additional circuits.
2Adaptability or versatility
If the upper limit of boost voltage is constrained by the low voltage side value in a voltage increase process, then the circuit design is simple, but the voltage increase capability is restricted
Solution Approach 1:
The patent designs a universal voltage conversion circuit that can handle both voltage increase and voltage decrease operations using the same transformer structure. By dividing the secondary winding into multiple sections with different turn ratios, the circuit can adapt to different voltage conversion needs without requiring separate voltage increase circuits, thereby expanding the boost voltage range while keeping the component count low.
3Adaptability or versatility
If a separate voltage increase circuit is provided to achieve desired voltage values, then the voltage range is expanded, but the number of parts increases and the circuit size increases
Solution Approach 1:
The patent merges multiple voltage conversion functions into a single transformer structure by dividing the secondary winding into multiple sections. Each section provides a different turn ratio, allowing the circuit to achieve various voltage conversion ratios by switching between sections. This integration eliminates the need for separate voltage increase circuits, thereby expanding the voltage conversion range while reducing the overall number of components and circuit size.
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 design enables a wider range of boost voltages, from twice the turn ratio to 0V, reducing the number of components and making the converter more compact and cost-effective.
Implementation Method 1
a first transformer (1) which includes a primary side winding (1L) and a secondary side winding (1A, 1B)
Data Source
AI summary
Provided is a bidirectional DC/DC converter which can control a boost voltage in a wide range. The DC/DC converter includes: three series circuits formed by a first to a sixth switch, each two of which are connected in series between a plus terminal and a minus terminal of a high voltage side; two transformers in which primary windings are connected in series and input terminals of the primary windings are connected to connection points of the switching elements; and a seventh to a tenth switch. The transformers have secondary windings, each of which is divided at the middle point. The middle points are connected to a minus terminal of a low voltage side. Respective terminals of the secondary windings are connected to a plus terminal of the low voltage side by the seventh to the tenth switches.