Totem-Pole Bridgeless PFC Converter Layout for Negative Surge Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional totem pole bridgeless PFC power converters face challenges in managing negative surge voltages, which lead to excessive current and stress on switching devices, resulting in potential deterioration and inefficiency.
Innovation Solution
The implementation of split inductors and bypass diodes in the totem pole bridgeless PFC power converter design, where one inductor is coupled on the input side of the diodes and another on the output side, helps suppress excessive current by inducing an electromotive force that opposes the surge, and allows for quick control adjustments to mitigate stress on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional totem pole bridgeless PFC power converter topology is used, then device complexity is reduced, but negative surge voltages cause excessive current and stress on switching devices
Solution Approach 1:
The single inductor is segmented into two separate inductors: a first inductor coupled to the AC input and a second inductor coupled to the DC output. This segmentation allows each inductor to independently manage specific portions of the circuit, with the first inductor suppressing negative surge voltages from the AC side and the second inductor managing the DC output side, thereby protecting switching devices without increasing overall topology complexity
Solution Approach 2:
The first inductor acts as an intermediary element between the AC input and the switching devices, suppressing negative surge voltages before they can reach the switching devices. This intermediary component isolates the switching devices from harmful voltage spikes while maintaining the simplicity of the bridgeless PFC topology
2Reliability
If split inductors are added to suppress negative surge voltages, then switching device stress is reduced, but device complexity increases
Solution Approach 1:
The inductor function is segmented into two separate components with distinct roles: the first inductor handles AC input filtering and surge suppression, while the second inductor manages DC output current. This segmentation achieves reliable surge protection while maintaining a relatively simple topology that can be implemented with standard components
Solution Approach 2:
Each inductor serves multiple functions: the first inductor provides both input filtering and negative surge voltage suppression, while the second inductor provides output current regulation and energy storage. This multi-functionality reduces the need for additional protective components, balancing reliability improvement with complexity management
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 effectively reduces stress and deterioration on switching devices and other components by quickly managing excessive current, improving the overall efficiency and reliability of the power converter.
Implementation Method 1
one inductor is coupled on the input side of the diodes and another on the output side, helps suppress excessive current by inducing an electromotive force that opposes the surge
Data Source
AI summary
An electric power supply includes a totem pole bridgeless PFC power converter. The PFC power converter includes an input for coupling to an AC power source, an output, four switching devices coupled between the input and the output, two diodes coupled between the four switching devices and the input, a first inductor coupled between the four switching devices and the two diodes, and a second inductor coupled between the two diodes and the input. Other example electric power supplies and totem pole bridgeless PFC power converters are also disclosed.