Switched-Capacitor Voltage Conversion for Low-Loss 48V Step-Down
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Solution Overview
Problem
The existing two-stage architecture for voltage conversion from 48 V to 1 V-2 V in electronic circuits is inefficient, leading to high power losses and unsatisfactory conversion efficiency due to the traditional step-down DC/DC structure, where power switches must handle the input voltage and output current individually.
Innovation Solution
A voltage conversion circuit with a controller that manages a network of energy storage branches and switches to achieve a 2N:D voltage ratio through duty cycle control, reducing the voltage rating and maximum current for each power switch, thereby enhancing switching utilization efficiency and reducing power losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional step-down DC/DC structure is used in two-stage architecture, then voltage conversion from 48V to 1V-2V can be achieved, but power switches must withstand high input voltage and carry full output current individually, resulting in high power losses and low conversion efficiency
Solution Approach 1:
The patent divides the voltage conversion process into multiple stages with multiple energy storage branches (first, second, and third energy storage branches). Each branch contains switches that handle only a portion of the total voltage and current, rather than requiring single switches to handle the full 48V input voltage and complete output current. This segmentation reduces the stress on individual power switches and lowers power losses.
Solution Approach 2:
The patent combines multiple energy storage branches with capacitors and switches working in parallel to achieve the overall voltage conversion. The multiple branches cooperate to transfer energy from the 48V input to the lower voltage output, distributing the power handling across multiple components rather than relying on a single DC/DC converter stage.
2Productivity
If traditional step-down DC/DC structure is used, then voltage conversion function is provided, but power switches need to handle high voltage and current individually, leading to higher cost and lower efficiency
Solution Approach 1:
The voltage conversion circuit is segmented into multiple energy storage branches, where each branch handles a fraction of the total power conversion task. The switches in each branch only need to withstand a portion of the input voltage and carry a fraction of the output current, reducing conduction losses and switching losses compared to traditional single-stage DC/DC converters.
Solution Approach 2:
The patent employs dynamic control of multiple switches across different energy storage branches, with duty cycles adjusted to optimize power transfer efficiency. The controller dynamically manages the switching patterns to maintain high conversion efficiency while distributing the power handling burden across multiple components.
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 proposed solution achieves higher voltage conversion efficiency by reducing the voltage each power switch must handle and the maximum current it needs to carry, resulting in lower power loss and improved efficiency in converting 48 V to lower voltages for CPU and DDR memory.
Implementation Method 1
The first energy storage branch includes a first capacitor, a second capacitor, a first switch, a second switch, a third switch and a fourth switch
Implementation Method 2
A voltage conversion circuit with a controller that manages a network of energy storage branches and switches to achieve a 2N:D voltage ratio
Data Source
AI summary
The voltage conversion circuit includes an input terminal, an output terminal, a first energy storage branch, a second energy storage branch, a third energy storage branch and a controller. The input terminal is used to connect with the input power supply. The output terminal is used to connect to the load. The first energy storage branch is connected to the input terminal, the second energy storage branch and the third energy storage branch. The second energy storage branch is connected to the first energy storage branch. The three energy storage branches are connected to the output terminal. The first energy storage branch includes a first capacitor, a second capacitor, a first switch, a second switch, a third switch and a fourth switch. The controller is connected with the first terminals of the switches of the first energy storage branch, the second energy storage branch and the third energy storage branch.