Multi-Winding Transformer Circuit for Adjustable DC/DC Voltage Ratios
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Solution Overview
Problem
Conventional power conversion circuits have a fixed ratio of input voltage to output voltage, limiting their applications due to the inability to adjust this ratio, which restricts their adaptability and efficiency in high-power DC/DC power conversion applications.
Innovation Solution
A power conversion circuit design that includes a transformer with multiple windings and resonant capacitors, allowing the ratio of input voltage to output voltage to be adjusted by varying the turn numbers of the windings, and utilizing a pre-charging circuit or start circuit to enhance efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional power conversion circuit with fixed winding ratios is used, then the circuit structure is simple, but the voltage conversion ratio cannot be adjusted, limiting application versatility
Solution Approach 1:
The transformer is divided into multiple independent windings (first winding, second winding, third winding) with different turns ratios. By selectively connecting different winding combinations, the circuit achieves multiple discrete voltage conversion ratios without requiring a continuously adjustable mechanism, thus balancing versatility with structural simplicity
Solution Approach 2:
The circuit enables dynamic switching between different voltage conversion ratios through the controlled connection of bridge arms and switches. The transformer windings can be reconfigured in real-time to adapt to different output voltage requirements, transforming a static fixed-ratio circuit into a dynamic multi-ratio circuit
2Adaptability or versatility
If the voltage conversion ratio is fixed at 4:1, then the circuit design is straightforward, but the circuit cannot adapt to different power conversion requirements
Solution Approach 1:
The transformer with multiple windings serves multiple functions: it can operate in different connection modes (series, parallel, or individual winding configurations) to provide various voltage conversion ratios. This multi-functional design allows a single circuit to replace multiple dedicated circuits for different voltage ratios, expanding application range while managing complexity through functional integration
3Loss of energy
If conventional switches are used without pre-charging, then the circuit is simple, but switching losses are high and efficiency is reduced
Solution Approach 1:
The pre-charging circuit charges the resonant capacitors before the main switching operation occurs. By pre-charging the capacitors to the appropriate voltage level, the switches turn on under zero-voltage or low-voltage conditions, significantly reducing switching losses and improving overall circuit efficiency without requiring complex soft-switching control mechanisms
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
Enables adjustable voltage ratios, expanding the applications of power conversion circuits and improving efficiency by reducing switching losses and allowing for flexible power management in high-power DC/DC conversion scenarios.
Implementation Method 1
The transformer includes a first winding, a second winding and a third winding, which are coupled with each other
Implementation Method 2
The first resonant capacitor and the first winding are connected in series between the second node and the fifth node
Data Source
AI summary
A power conversion circuit includes an input positive terminal, an input negative terminal, an output positive terminal, an output negative terminal, a first bridge arm, a second bridge arm, a transformer, a first resonant capacitor, a second resonant capacitor, a third resonant capacitor and a third resonant capacitor. The transformer includes a first winding, a second winding and a third winding. The plurality of switches in the first bridge arm and the plurality of switches in the second bridge arm are selectively turned on or turned off. The ratio of the input voltage to the output voltage can be adjustable by changing the turn numbers of the first winding, the second winding and the third winding.