Mixed Analog-Digital Converter Circuit Ripple Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional switch-mode power supplies face challenges with low conversion efficiency, severe thermal issues, and low power density due to high ripple power fluctuations, which existing methods struggle to address effectively.
Innovation Solution
A mixed analog-to-digital converter circuit is introduced, featuring a power supply and digital converter connected to a load assembly via power supply capacitors with charge and discharge switches, allowing for stable voltage maintenance and reduced ripple power delivery, even without advanced control methods, thereby increasing power density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If switch-mode power supply is used, then conversion efficiency is improved and thermal issues are reduced, but output voltage ripples increase and require bulk low-pass filters
Solution Approach 1:
The patent segments the single large capacitor into multiple smaller capacitors connected in parallel. Each capacitor handles a portion of the ripple current, dividing the harmful ripple effects into manageable segments. This segmentation reduces the stress on individual capacitors and allows for more effective ripple filtering without requiring a single large bulk capacitor.
Solution Approach 2:
The patent introduces a new dimensional approach by using multiple capacitors with different capacitance values and time constants. This creates multiple time domains for ripple filtering, where each capacitor targets specific frequency ranges. The combination of capacitors in parallel provides multi-frequency ripple suppression that a single capacitor cannot achieve.
2Object-generated harmful factors
If multi-level converters are used to reduce ripple sizes, then output voltage ripples are reduced, but device complexity and number of semiconductors increase
Solution Approach 1:
The patent extracts the ripple filtering function from the main power conversion circuitry and places it in a separate capacitor network. This extraction allows the multi-capacitor ripple reduction system to operate independently without adding complexity to the semiconductor switching network or control circuits. The ripple filtering is handled by passive capacitor elements rather than active semiconductor components.
Solution Approach 2:
The patent introduces a network of capacitors as intermediary elements between the switch-mode power supply and the load. These capacitors act as mediators that absorb and smooth voltage ripples without requiring complex control mechanisms. The capacitor network serves as a buffer that decouples the ripple-generating switching circuit from the sensitive load.
3Object-generated harmful factors
If switch frequency is increased to improve filtering effect, then low-pass filter effectiveness is improved, but power loss in semiconductors and magnetic units increases
Solution Approach 1:
The patent employs dynamic capacitor selection and switching mechanisms that adapt to varying load conditions and ripple characteristics. By dynamically adjusting which capacitors are active and how they are configured, the system optimizes filtering effectiveness at each moment without requiring a uniformly high switching frequency. This dynamic approach allows for lower average switching frequencies while maintaining effective ripple suppression.
4Object-generated harmful factors
If advanced control methods like active capacitance are used, then ripple power transfer to load is reduced, but control bandwidth is limited by switch frequency
Solution Approach 1:
The patent implements a self-service ripple filtering system where the capacitor network automatically performs ripple suppression without requiring external active control. The capacitors naturally respond to voltage fluctuations through their inherent electrical properties, providing passive ripple compensation. This self-service mechanism eliminates the need for high-bandwidth active control loops while still effectively reducing ripple power delivered to the load.
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 circuit effectively reduces output voltage ripples and increases power density by stabilizing voltages at the load ends, minimizing the need for large low-pass filters and reducing electromagnetic interference, while maintaining a compact circuit volume.
Implementation Method 1
The analog converter includes a plurality of power supply capacitors; two ends of each power supply capacitor are respectively connected to the input end and the output end of the digital converter through charge wires
Implementation Method 2
at least one of the charge wires is equipped with a charge switch; at least one of the discharge wires is equipped with a discharge switch
Data Source
AI summary
A mixed analog-to-digital converter circuit capable of stabilizing voltages at two ends of a load and reducing output voltage ripples, includes a power supply, a digital converter, an analog converter, and a load assembly. The analog converter includes power supply capacitors arranged in parallel; and when working, the load assembly is connected to corresponding power supply capacitors, and the power supply capacitors not connected to the load assembly are connected to the digital converter. The digital converter includes a component multiplexer connected to input and output ends of a power supply through wires; the component multiplexer includes power supply capacitors arranged in series; the analog converter includes the component multiplexer; two ends of each power supply capacitor in the component multiplexer are respectively connected to input and output ends of the load assembly through discharge wires; and when working, the load assembly is connected to corresponding power supply capacitors.