LLC Resonant Converter With Hybrid Rectification for Wide Gain Range
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Solution Overview
Problem
Existing LLC resonant DC-DC converters experience low conversion efficiency when adjusting input-output voltage over a wide range.
Innovation Solution
A resonant converter comprising a high-frequency inversion circuit, an LLC resonant tank network, and a hybrid rectification circuit that switches between full-bridge and voltage doubling rectification modes based on the direct current voltage adjustment gain, allowing for wider gain range and reduced reactive power cycle loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the input-output voltage is adjusted over a wide range in an LLC resonant DC-DC converter, then the voltage conversion capability is improved, but the conversion efficiency deteriorates
Solution Approach 1:
The rectification circuit dynamically switches between full-bridge rectification mode and voltage doubling rectification mode based on the voltage adjustment gain. This dynamic mode switching enables the system to adapt to different voltage conversion requirements while maintaining high conversion efficiency across a wide voltage range, resolving the contradiction between wide voltage adaptability and high efficiency.
Solution Approach 2:
The invention changes the operating parameters of the rectification circuit by switching between different rectification modes. When the voltage adjustment gain is within a first threshold range, full-bridge rectification mode is used; when it exceeds this range, voltage doubling rectification mode is activated. This parameter change approach allows the system to maintain optimal efficiency across varying voltage conversion ratios.
2Device complexity
If a single rectification mode is used, then the circuit structure is simple, but the gain range is limited
Solution Approach 1:
The rectification circuit is designed with multi-functionality, capable of operating in both full-bridge rectification mode and voltage doubling rectification mode. This universal design allows a single circuit structure to achieve multiple functions: wide gain range coverage and reduced reactive power cycle loss, without requiring completely separate circuits for different operating conditions.
Solution Approach 2:
The system dynamically selects the appropriate rectification mode based on the voltage adjustment gain requirements. This dynamic adaptability allows the circuit to maintain simplicity while achieving extended gain range, as the same physical circuit components are reconfigured through switching rather than requiring multiple dedicated circuits.
3Adaptability or versatility
If the switching frequency is increased to expand the gain range, then the voltage adjustment capability is improved, but the reactive power cycle loss increases
Solution Approach 1:
Instead of increasing switching frequency to expand gain range, the invention dynamically switches rectification modes to achieve wider gain range. This approach avoids the penalty of increased reactive power cycle loss associated with higher switching frequencies, as the switching frequency can remain optimized for efficiency while the rectification mode adaptation provides the necessary gain range expansion.
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 solution achieves high conversion efficiency during wide input-output voltage power conversion by optimizing the rectification mode switching, thereby enhancing the converter's efficiency and gain range.
Implementation Method 1
a high-frequency inversion circuit, configured to convert a first direct current voltage into a first alternating current voltage
Implementation Method 2
an LLC resonant tank network, configured to adjust the first alternating current voltage to obtain a second alternating current voltage
Data Source
AI summary
A resonant converter and a voltage conversion method. The resonant converter includes a high-frequency inversion circuit, an inductor-inductor-capacitor (LLC) resonant tank network, and a hybrid rectification circuit. The LLC resonant tank network is separately coupled to the high-frequency inversion circuit and the hybrid rectification circuit. The high-frequency inversion circuit is configured to convert a first direct current voltage into a first alternating current voltage. The LLC resonant tank network is configured to adjust the first alternating current voltage to obtain a second alternating current voltage.