Interlocked AC/DC and DC/DC Converters for Wide Voltage Efficiency
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Solution Overview
Problem
Conventional power delivery (PD) devices face efficiency deterioration when operating over wide voltage ranges, making it difficult to maintain high power efficiency across varying voltage outputs from 10 W to 100 W.
Innovation Solution
The implementation of an interlocked AC/DC converter and DC/DC converter system, where the AC/DC converter adjusts AC input to a desired voltage and the DC/DC converter further adjusts the output voltage, ensuring high power efficiency across a wide voltage range by complementing each other's efficiency peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single DC/DC converter is used to deliver power over wide voltage ranges (10W-100W), then the voltage range coverage is improved, but power efficiency deteriorates
Solution Approach 1:
The patent divides the single DC/DC converter into two separate converters: an AC/DC converter for voltage conversion from AC input to intermediate DC voltage, and a DC/DC converter for final DC voltage adjustment. Each converter operates within its optimized voltage range, preventing efficiency deterioration that would occur in a wide-range single converter.
Solution Approach 2:
The patent introduces an intermediate voltage stage between AC input and final DC output. The AC/DC converter produces an intermediate DC voltage that serves as input for the DC/DC converter, creating a two-stage voltage transformation process that maintains high efficiency at each stage while achieving wide overall voltage coverage.
2Adaptability or versatility
If voltage is changed to desired voltage within wide range (10W-100W), then the adaptability to different power requirements is improved, but power efficiency deteriorates due to output voltage variations
Solution Approach 1:
The patent implements dynamic voltage adjustment in two stages: the AC/DC converter dynamically adjusts AC input to intermediate DC voltage, and the DC/DC converter dynamically adjusts intermediate DC voltage to final DC output. This two-stage dynamic adjustment allows each converter to operate within its efficient range while adapting to varying power requirements from 10W to 100W.
Solution Approach 2:
The AC/DC converter acts as an intermediary between AC input and the DC/DC converter. It converts AC input to an intermediate DC voltage that serves as optimal input for the DC/DC converter, enabling the final converter to efficiently deliver various DC voltage levels without direct AC-to-DC conversion losses.
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 achieves satisfactory power efficiency over a wide output voltage range by optimizing power delivery, reducing efficiency deterioration and maintaining high efficiency across the desired voltage range.
Implementation Method 1
an AC/DC converter connected to an AC input, the AC/DC converter configured to change the AC input to a desired voltage value
Implementation Method 2
a DC/DC converter connected between an output of the AC/DC converter and a DC output, the DC/DC converter configured to change the output of the AC/DC converter to desired voltage value
Data Source
AI summary
A power delivery (PD) device includes: an AC/DC converter connected to an AC input, the AC/DC converter configured to change the AC input to a desired voltage value to be output in accordance with a first voltage changing control signal supplied from outside; and a DC/DC converter connected between an output of the AC/DC converter and a DC output, the DC/DC converter configured to change the output from the AC/DC converter to a desired voltage value to be output as a DC output in accordance with a second voltage changing control signal supplied from outside, wherein the AC/DC converter at a previous stage and the DC/DC converter at a subsequent stage are interlocked to change the output voltage to desired target voltage. There can be provided the PD device capable of delivering power with high power efficiency over the wide voltage ranges.