Passive Coupled-Inductor Soft-Switching Circuit for Power Factor Correctors
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Solution Overview
Problem
Conventional power factor correctors in continuous conduction mode experience significant switching losses due to voltage and current delays during switching, which are not effectively mitigated by existing technologies.
Innovation Solution
A passive coupled-inductor soft-switching circuit that employs a buffer circuit with coupled inductors and diodes to achieve phase interlacing shifts between voltage and current, reducing switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional boost converter in continuous conduction mode uses hard switching, then the circuit structure is simple, but switching loss increases due to voltage and current delays during switching transitions
Solution Approach 1:
The patent introduces a buffer circuit as an intermediary component between the main power circuit and ground. This buffer circuit includes a coupled inductor with two winding sets, multiple diodes (second, third, and fourth diodes), and capacitors that work together to create phase interlacing shifts. The buffer circuit acts as a mediator that generates reverse recovery current to cancel the tail current of the power switch, thereby achieving soft switching conditions without fundamentally altering the main boost converter structure
Solution Approach 2:
The buffer circuit performs preliminary action by pre-establishing the conditions for soft switching before the power switch turns off. The coupled inductor and diode network in the buffer circuit are configured to automatically generate the necessary reverse recovery current when the power switch begins to turn off, creating the phase interlacing shift that enables zero-current switching (ZCS) or soft switching conditions before the main switching transition occurs
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 solution effectively reduces switching losses by ensuring phase interlacing shifts between voltage and current, enhancing the efficiency of power factor correction in continuous conduction mode.
Implementation Method 1
The coupled inductor includes a first winding set and a second winding set... Both of the first winding set and the second winding set have a first terminal and a second terminal
Implementation Method 2
The second diode has a positive terminal and a negative terminal... The third diode has a positive terminal and a negative terminal... The fourth diode has a positive terminal and a negative terminal
Implementation Method 3
The first capacitor has a first terminal and a second terminal... The second capacitor has a first terminal and a second terminal
Data Source
AI summary
A passive coupled-inductor soft-switching circuit of a power factor corrector is provided. The passive coupled-inductor soft-switching circuit includes a power input terminal, a first inductor, a first diode, a power output terminal, a power switch and a buffer circuit. The first inductor has a first terminal and a second terminal, wherein the first terminal of the first inductor is electrically coupled with the power input terminal. The first diode has a positive terminal and a negative terminal, wherein the positive terminal of the first diode is electrically coupled with the second terminal of the first inductor. The power output terminal is electrically coupled with the negative terminal of the first diode. The buffer circuit is electrically coupled with the power switch. By using the buffer circuit, the voltage and current have phase interlacing shifts and thereby reducing the switching loss.