Power Converter with Segmented Switching Stages for Ripple Reduction
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Solution Overview
Problem
Conventional power converters with high gain suffer from significant output voltage ripple and require large output capacitance, particularly in cascade connections.
Innovation Solution
The power converter design incorporates a cascade connection of A-type and B-type switching power stage circuits with interleaving and phase-shift control, utilizing energy storage elements and magnetic elements to achieve high gain while minimizing output capacitance and stabilizing output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional high gain power converters use cascade connection, then power conversion gain is improved, but output voltage ripple increases and output capacitance requirement increases
Solution Approach 1:
The power converter is divided into multiple switching power stage circuits (first, second, third, fourth stages) that operate in sequence. Each stage processes the voltage independently, allowing the overall system to achieve high gain while each individual stage operates at lower stress levels, reducing output voltage ripple and capacitance requirements.
Solution Approach 2:
The switching power stage circuits operate with periodic switching actions at different duty cycles. The first and second switching stages operate with different duty cycles, creating a periodic pattern that smooths output voltage and reduces ripple through interleaved switching operations.
2Power
If conventional high gain power converters use cascade connection, then power conversion gain is improved, but output capacitance requirement increases
Solution Approach 1:
The cascade connection is segmented into four distinct switching power stages rather than using fewer high-gain stages. This segmentation distributes the voltage multiplication across multiple lower-gain stages, allowing each stage to use smaller energy storage elements and reducing the total output capacitance requirement.
Solution Approach 2:
The duty cycles of the switching power stages are optimized and adjusted to achieve the desired output voltage with minimal capacitance. By changing the operating parameters (duty cycles) of each stage, the system achieves high gain while minimizing the energy storage requirements.
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 results in a power converter with high gain, adjustable stabilized output voltage, reduced output capacitance, and simplified control, effectively addressing the issues of voltage ripple and capacitance requirements.
Implementation Method 1
N A-type switching power stage circuits, each having a first energy storage element... one B-type switching power stage circuit... N second energy storage elements
Data Source
AI summary
A power converter can include: first and second terminals; N A-type switching power stage circuits, each having a first energy storage element, where N is a positive integer, a first terminal of a first A-type switching power stage circuit in the N A-type switching power stage circuits is coupled to the first terminal of the power converter, and a second terminal of each of the N A-type switching power stage circuits is coupled to the second terminal of the power converter; one B-type switching power stage circuit; and N second energy storage elements, each being coupled to one of the N A-type switching power stage circuits, and the B-type switching power stage circuit is coupled between a terminal of one of the N second energy storage elements corresponding to the B-type switching power stage circuit and the second terminal of the power converter.