Modular High Step-Down DC/DC Converter With Interleaved Modulation
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Solution Overview
Problem
Conventional DC-to-DC converters fail to achieve high density and high step-down voltage ratios, often requiring numerous costly components and inefficient energy transfer.
Innovation Solution
The use of at least two switching components and conductivity arbitrating devices, with driver circuitry delivering interleaved modulation and duty cycle signals configured to achieve efficient energy transfer, utilizing a duty cycle of 1/(nc+1) where nc is (n−1)/3, and incorporating modular cells with MOSFETs and inductors for enhanced efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional DC-to-DC converter architectures are used, then the converter can perform basic voltage conversion, but it fails to achieve high density and high step-down voltage ratios
Solution Approach 1:
The converter is divided into multiple modular cells, each containing switching components and conductivity arbitrating devices. This segmentation allows the system to achieve high step-down voltage ratios by combining multiple simpler stages, where each cell contributes to the overall voltage conversion in a systematic manner.
Solution Approach 2:
The patent employs dynamic interleaved modulation of duty cycle signals to control the switching components. The duty cycle is configured as 1/(nc+1) where nc is the number of modular cells, allowing dynamic adjustment of the conversion ratio and enabling high step-down ratios while maintaining efficient energy transfer across varying operating conditions.
2Power
If conventional DC-to-DC converters are used, then basic conversion is achieved, but numerous costly components are required
Solution Approach 1:
Each modular cell is designed to perform multiple functions: voltage conversion, energy storage, and current regulation. The switching components and conductivity arbitrating devices serve dual purposes, reducing the total component count while maintaining conversion capability. The inductor and capacitor in each cell contribute to both power transfer and filtering functions.
Solution Approach 2:
Multiple modular cells are combined in a parallel-interleaved configuration where similar components across cells work together to achieve the overall conversion function. This merging approach allows the system to achieve high power conversion with fewer unique components compared to conventional architectures, as each cell uses standardized switching and energy storage elements.
3Loss of energy
If conventional DC-to-DC converters are used, then basic energy transfer is achieved, but energy transfer efficiency is insufficient
Solution Approach 1:
The converter employs periodic interleaved switching of modular cells with duty cycle modulation. By alternately activating different cells in a periodic manner with duty cycle 1/(nc+1), the system achieves continuous energy transfer with reduced ripple and improved efficiency, as each cell operates in an optimized switching regime that minimizes losses.
Solution Approach 2:
The interleaved operation of multiple modular cells ensures continuous energy transfer from input to output. While one cell is in its switching transition phase, another cell is in its energy transfer phase, maintaining continuous power flow and reducing energy losses associated with discontinuous operation and large current ripple.
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 enables high-density, efficient energy transfer with fewer components, achieving higher step-down voltage ratios and reducing component costs, while meeting space demands and improving energy efficiency.
Implementation Method 1
The inductor may resonate with a capacitance
Data Source
AI summary
Method and apparatus include a circuit having a duty cycle and interleaving modulation configured to realize high density and efficient energy transfer. The circuit may efficiently achieve higher step-down voltage ratios with fewer electrical components. For example, as few as seven electrical devices, such as switches and diodes, may be used to realize at least a four-to-one conversion ratio. The high density of the circuit is advantageous to meet shrinking space demands A modulator may interleave signals sent to the electrical components (e.g., switching devices via driver circuitry). The driver signals may include a duty cycle of 1/(nc+1), where nc is (n−1)/3, and n is the number of devices.