Variable-Reactor DC-DC Converter for Wider Soft Switching
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Solution Overview
Problem
The existing three-level DC-DC converter's power conversion efficiency is limited due to a fixed inductance value, which restricts the expansion of the soft switching region, leading to insufficient power conversion efficiency.
Innovation Solution
A power converter with a variable reactor and transformer, where the inverter circuit converts DC voltage to AC voltage, and the transformer further converts it to DC voltage, allowing for adjustable inductance to enhance power conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed inductance value from leakage inductance of isolation transformer is used, then the device complexity is reduced, but the power conversion efficiency is insufficient
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed inductance (leakage inductance of isolation transformer) with a variable inductance reactor. This allows the inductance value to be dynamically adjusted based on operating conditions, enabling optimization of power conversion efficiency across different load scenarios while maintaining a relatively simple overall device structure.
Solution Approach 2:
The patent implements parameter changes by varying the inductance value of the reactor according to different operating conditions. This parameter adjustment enables the system to achieve optimal power conversion efficiency at different load levels, resolving the contradiction between simple device structure and sufficient power conversion efficiency.
2Loss of energy
If the inductance value is increased to expand soft switching region, then the power conversion efficiency is improved, but the device complexity increases
Solution Approach 1:
Instead of using a large fixed inductance that would increase device complexity, the patent employs a variable inductance reactor that can dynamically adjust its inductance value. This allows the system to achieve the necessary soft switching region expansion only when needed, rather than requiring a permanently large inductance value, thus avoiding unnecessary device complexity.
Solution Approach 2:
The patent changes the inductance parameter dynamically based on operating conditions rather than using a permanently high inductance value. This approach enables soft switching region expansion and improved power conversion efficiency without the penalty of increased device complexity that would result from a fixed high inductance design.
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 power converter significantly improves power conversion efficiency by expanding the soft switching region and reducing switching losses, achieving higher efficiency across varying load conditions.
Implementation Method 1
The transformer includes a primary winding and a secondary winding that are magnetically coupled to each other to insulate a primary side and a secondary side from each other, and converts the first AC voltage applied via the variable reactor, into a second AC voltage
Data Source
AI summary
A power converter includes an inverter circuit, a variable reactor, a transformer, and a converter circuit. The inverter circuit includes a plurality of switching elements and snubber capacitors each connected in parallel to a corresponding one of the switching elements, and converts a first DC voltage into a first AC voltage. The variable reactor is disposed on the output side of the inverter circuit and configured to be variable in inductance value. The transformer insulates the primary side and the secondary side from each other, and converts the first AC voltage applied via the variable reactor into a second AC voltage. The converter circuit converts the second AC voltage into a second DC voltage.