Resonant Inverting Buck-Boost Converter for Soft Switching
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Solution Overview
Problem
High-power converters, particularly those using inverting buck-boost converters, experience large inductor currents and voltage stress, leading to increased switching noise, electromagnetic interference, and inefficiencies due to hard switching.
Innovation Solution
A resonant inverting buck-boost converter with a switching circuit and resonant circuit, including a first and second switch connected in series and a third switch, operates in multiple modes to achieve zero voltage and zero current switching, reducing switching noise and improving efficiency through sinusoidal current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If inverting buck-boost converter is used for high-power conversion, then voltage conversion capability is improved, but switching noise and electromagnetic interference increase
Solution Approach 1:
The patent applies resonant switching by configuring the resonant circuit (including resonant inductor and resonant capacitor) to oscillate at a specific resonant frequency, transforming the hard switching into soft switching. This resonant vibration approach allows the switches to turn on and off when current or voltage is zero, significantly reducing switching noise and electromagnetic interference while maintaining high-power conversion capability
Solution Approach 2:
The patent implements periodic switching operation where the first and second switches alternately turn on and off in a periodic manner. This periodic action, combined with the resonant circuit, creates controlled oscillations that enable soft switching conditions to be repeatedly achieved, reducing harmful electromagnetic effects during each switching cycle
2Power
If inverting buck-boost converter is used for high-power conversion, then voltage conversion capability is improved, but switching losses increase
Solution Approach 1:
The resonant circuit creates oscillations that enable the switches to operate under soft switching conditions (zero voltage switching or zero current switching), minimizing the energy lost during switching transitions. This resonant vibration approach significantly reduces switching losses while maintaining high-power conversion capability
Solution Approach 2:
The patent changes the switching parameters by operating at resonant frequency rather than fixed frequency, and by controlling the timing of switch transitions to occur at zero voltage or zero current points. This parameter optimization reduces switching losses and improves overall power conversion efficiency
3Loss of energy
If resonant circuit is added to achieve soft switching, then switching losses are reduced, but device complexity increases
Solution Approach 1:
The patent merges the resonant circuit components (resonant inductor and resonant capacitor) with the existing power conversion circuitry. The resonant inductor is integrated into the power conversion path, and the resonant capacitor is positioned to work in conjunction with the switches, achieving soft switching without requiring entirely separate circuit systems
Solution Approach 2:
The resonant circuit serves multiple functions: it enables soft switching to reduce losses, it provides voltage conversion capability, and it controls the timing of switch transitions. This multi-functionality reduces the need for additional dedicated components and simplifies the overall circuit architecture
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 converter achieves reduced switching losses, decreased electromagnetic interference, and enhanced power conversion efficiency by implementing soft switching, with smaller resonant circuit components and improved voltage regulation.
Implementation Method 1
a resonant circuit connected to the switching circuit through a first node between the first switch and the second switch. The resonant circuit may include a resonant capacitor, a first inductor, and a second inductor connected in series with each other
Data Source
AI summary
A power converter and an electronic device including the same are disclosed. The power converter includes a switching circuit comprising a first switch and a second switch connected in series between a power source and the ground, a resonant circuit connected to the switching circuit through a first node between the first switch and the second switch and comprising a resonant capacitor, a first inductor, and a second inductor, and a third switch connecting or disconnecting between a second node of the resonant circuit and a load. The operation mode of the power converter includes a first mode, a second mode, and a third mode in which the switching states of the first switch, the second switch, and the third switch are controlled differently from each other.