LLC Resonant Converter Inductor Segmentation
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Solution Overview
Problem
Conventional full bridge LLC resonant converters face inefficiencies due to high switching losses, which hinder their performance in telecommunication network power systems.
Innovation Solution
The implementation of a resonant tank comprising a resonant inductor, a resonant capacitor, and two parallel inductors, where the first parallel inductor acts as magnetizing inductance and the second as a separate inductor, with the first inductance being greater than the second, to achieve zero voltage and current switching, thereby reducing switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional full bridge converter topology is used, then power conversion capability is achieved, but switching losses are high
Solution Approach 1:
The patent applies resonant oscillation principles by introducing a resonant tank circuit with specific inductance and capacitance values. The converter operates at the resonant frequency of the tank circuit, creating oscillating current and voltage waveforms that enable zero-voltage switching. This resonant vibration approach transforms the hard switching mechanism into a soft switching mechanism, significantly reducing switching losses while maintaining power conversion capability.
Solution Approach 2:
The patent changes the operating parameters of the converter by introducing specific inductance ratios (L1/L2) and operating at resonant frequency rather than fixed frequency. The resonant frequency is determined by the tank circuit parameters (Lr, Cr, L1, L2), and by adjusting these parameters, the converter achieves optimal soft switching conditions. This parameter transformation from fixed-frequency hard switching to variable-frequency resonant switching resolves the contradiction between power conversion and switching losses.
2Loss of energy
If phase shift full bridge converter is used to reduce switching losses, then zero voltage switching is achieved, but device complexity increases
Solution Approach 1:
Instead of using complex phase shift control mechanisms, the patent employs resonant oscillation of the tank circuit to naturally produce the voltage and current waveforms needed for zero-voltage switching. The resonant vibration of the LC tank automatically creates the necessary timing relationships between switching events, eliminating the need for complex phase shift control circuitry while achieving the same loss reduction benefits.
Solution Approach 2:
The resonant tank circuit self-regulates the switching timing through its natural oscillation characteristics. The resonant frequency and waveform evolution are determined by the circuit parameters themselves, allowing the system to automatically achieve zero-voltage switching conditions without requiring external control intervention for timing adjustment. This self-service mechanism simplifies the control system while maintaining energy efficiency.
3Loss of energy
If LLC resonant converter configuration is implemented, then switching losses are reduced, but inductor design complexity increases
Solution Approach 1:
The patent segments the inductance function into two distinct inductors (L1 and L2) with specific ratio relationships, rather than using a single complex inductor. This segmentation allows each inductor to be optimized independently for its specific function: L1 for resonant operation and L2 for magnetizing function. The segmentation simplifies the design and manufacturing of individual inductors while achieving the desired overall performance.
Solution Approach 2:
The patent assigns different inductance values and characteristics to different parts of the circuit (L1 vs L2) based on their specific functional requirements. The inductor with larger inductance (L1) is optimized for resonant current flow, while the inductor with smaller inductance (L2) is optimized for magnetizing function. This local optimization of inductor properties at different circuit locations achieves overall system efficiency without requiring a single complex inductor 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
This configuration enhances the efficiency of the LLC resonant converter by enabling zero voltage and current switching, leading to reduced power losses and improved performance in telecommunication network power systems.
Implementation Method 1
resonant tank comprising a resonant inductor, a resonant capacitor
Implementation Method 2
a transformer providing isolation between a primary side and a secondary side
Data Source
AI summary
A resonant tank comprises a resonant inductor coupled to a switching network and a transformer, a resonant capacitor coupled to the switching network and the transformer, a first parallel inductor implemented as a magnetizing inductance and a second parallel inductor implement as a separate inductor, wherein a first inductance of the first parallel inductor is greater than a second inductance of the second parallel inductor.