5-Switch DC-DC Converter Reducing Conduction Losses
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Solution Overview
Problem
Current DC-DC converters, even with 3-level topologies and improved switching devices, face limitations in power conversion efficiency (PCE) for applications like UPS and ASD, necessitating further enhancements to reduce conduction and switching losses.
Innovation Solution
A 5-switch power conversion circuit with a double chopper topology is introduced, featuring four switches in a 3-level boost arrangement and a fifth switch connected in parallel with two others to reduce conduction losses, allowing for a one-switch ON-state conduction path during part of the power conversion cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 3-level boost converter topology is used, then voltage stresses on switching devices are reduced and current ripple frequency is increased, but power conversion efficiency is still insufficient for certain applications
Solution Approach 1:
The patent divides the power conversion circuit into multiple parallel conduction paths by adding a fifth switch that creates alternative current flow routes. This segmentation allows the system to switch between different topologies (single-path and dual-path) depending on operating conditions, thereby reducing conduction losses while maintaining the 3-level voltage stress benefits
Solution Approach 2:
The patent implements dynamic switching between different conduction paths based on real-time operating conditions. The control circuit dynamically activates the fifth switch to create a one-switch ON-state conduction path when it benefits efficiency, and switches between paths to optimize performance across varying load and voltage conditions
2Loss of energy
If more switches are added to reduce conduction losses, then power conversion efficiency improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by strategically placing the fifth switch only in specific positions within the circuit where it provides maximum efficiency benefit. The switch is positioned to create parallel conduction paths only in the boost converter section where conduction losses are most significant, rather than uniformly adding switches throughout the entire power conversion system
Solution Approach 2:
The patent merges the functionality of multiple switches into a coordinated system where the fifth switch works in conjunction with the existing four switches. By combining these switches under unified control, the system achieves reduced conduction losses without proportionally increasing complexity, as all switches are managed by a single control circuit
Data Source
AI summary
In accordance with presently disclosed embodiments, a 5-switch power conversion circuit that improves the power conversion efficiency (PCE) of a DC-DC converter with a double chopper topology is provided. The power conversion circuit adds minimal complexity through an additional switch, while preserving the benefits of a 3-level boost converter topology. The disclosed power conversion circuit uses four switches that are arranged in a 3-level boost converter arrangement, and a fifth switch that is connected in parallel with two of the other switches. The fifth switch helps to reduce the conduction power losses through the DC-DC converter by providing a one-switch ON-state conduction path instead of a two-switch path during part of the DC-DC power conversion cycle.