Selectable 3-Level Half-Bridge Circuit for Smaller Transformers
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Solution Overview
Problem
Existing DC-DC converters face limitations in reducing the size of inductors or transformers due to fixed voltage applications, leading to increased costs and complexity, particularly in half-bridge and five-level operation modes.
Innovation Solution
A selectable three-level half-bridge circuit that allows operation in half-bridge and 3-level half-bridge modes, enabling ±Vin/2 and ±Vin/4 voltage applications to the primary winding, respectively, facilitating smaller transformer designs and greater design flexibility with a single controller IC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If a full-bridge circuit operates in half-bridge or five-level operation mode, then voltage applied to the transformer is reduced to half or quarter of input voltage, but the transformer size cannot be reduced further due to fixed voltage application limitations
Solution Approach 1:
The patent implements dynamic voltage application by enabling the full-bridge circuit to switch between full-bridge operation mode (±V1), half-bridge operation mode (±V1/2), and five-level operation mode (0, ±V1/2, ±V1). This dynamic switching allows the voltage applied to the transformer to be adaptively adjusted based on operating conditions, thereby enabling further transformer size reduction while maintaining versatility across different voltage requirements.
Solution Approach 2:
The full-bridge circuit is designed to perform multiple functions by operating in three distinct modes: full-bridge mode for maximum voltage output, half-bridge mode for reduced voltage applications, and five-level mode for fine-grained voltage control. This multi-functionality allows a single circuit design to serve multiple voltage requirements, enabling optimized transformer sizing for specific applications while maintaining broad adaptability.
2Volume of stationary object
If the voltage applied to the primary winding is reduced to ±Vin/2 or ±Vin/4, then the transformer size can be reduced, but the circuit complexity increases due to multiple operation modes
Solution Approach 1:
The patent merges multiple operation modes (full-bridge, half-bridge, and five-level operation) into a single full-bridge circuit design. By integrating these different operational capabilities within one unified circuit architecture, the patent achieves reduced transformer size across multiple voltage requirements without proportionally increasing overall circuit complexity. The shared circuit components and unified control structure minimize the complexity overhead of supporting multiple operation modes.
3Adaptability or versatility
If a selectable three-level half-bridge circuit is implemented, then design flexibility is improved with wider voltage ranges, but component costs may increase
Solution Approach 1:
The full-bridge circuit is designed to perform multiple functions by operating in three distinct modes: full-bridge mode for maximum voltage output, half-bridge mode for reduced voltage applications, and five-level mode for fine-grained voltage control. This multi-functionality allows a single circuit design to serve multiple voltage requirements, enabling optimized transformer sizing for specific applications while maintaining broad adaptability.
Solution Approach 2:
The patent merges multiple operation modes (full-bridge, half-bridge, and five-level operation) into a single full-bridge circuit design. By integrating these different operational capabilities within one unified circuit architecture, the patent achieves reduced transformer size across multiple voltage requirements without proportionally increasing overall circuit complexity. The shared circuit components and unified control structure minimize the complexity overhead of supporting multiple operation modes.
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 reduces component costs and allows for wider input and output voltage ranges, minimizing transformer size and magnetic core losses while maintaining efficiency through zero-voltage switching and reduced magnetizing currents.
Implementation Method 1
a transformer including a primary winding connected to the half-bridge circuit
Data Source
AI summary
A DC-DC conversion circuit includes an input voltage; a half-bridge circuit connected to the input voltage and including a first leg with first, second, third, and fourth switching elements connected in series and including a second leg with first and second capacitors connected in series with each other and connected in parallel with the first leg; and a flying capacitor connected to a node between the first switching element and the second switching element and a node between the third switching element and the fourth switching element; a transformer including a primary winding connected to the half-bridge circuit; and a controller that controls the first to fourth switching elements. The controller selectively controls the half-bridge circuit in a half-bridge operation in which ±Vin/2 is applied to the primary winding, where Vin is the input voltage and a 3-level half-bridge operation in which ±Vin/4 is applied to the primary winding.