Power Conversion Circuit with Segmented Inductor Charging
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Solution Overview
Problem
As electronic devices become smaller and more compact, power conversion circuits face a trade-off between increasing switching frequency and power handling performance, with higher switching frequencies leading to increased switching losses and limited power handling due to the size of resonant components.
Innovation Solution
A power conversion circuit design that includes a controller to manage switching elements and an inductor-capacitor configuration, allowing for improved power handling by charging the inductor with specific currents before charging or discharging the capacitor, thereby bypassing the limitations of the LC resonant tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the switching frequency of the power conversion circuit is increased to reduce the size of passive components, then the size and cost of large passive components are reduced, but the switching losses increase
Solution Approach 1:
The patent segments the power conversion process into distinct phases (first conduction path with first switching element, second conduction path with second switching element) to enable selective operation. This segmentation allows the circuit to operate in different modes depending on load conditions, optimizing the trade-off between component size and switching losses by using resonant operation at lower frequencies when possible while maintaining compact design benefits.
Solution Approach 2:
The patent implements dynamic switching between different conduction paths and operating modes based on real-time load conditions. The controller dynamically adjusts which switching elements are active and which conduction path is used, enabling the circuit to adapt its switching frequency and operational characteristics to minimize losses while maintaining the benefits of reduced component size.
2Volume of moving object
If the size of the resonant components is reduced to improve compactness, then the device becomes more compact, but the power handling performance deteriorates
Solution Approach 1:
The patent divides the power handling function across multiple switching elements and conduction paths. The first switching element handles power during the first conduction path operation, while the second switching element handles power during the second conduction path operation. This segmentation allows each component to be optimized for its specific role, enabling compact resonant components to handle higher overall power through coordinated multi-path operation.
Solution Approach 2:
The resonant components serve multiple functions: they enable voltage conversion, provide energy storage, and facilitate power transfer through different conduction paths. The inductor and capacitor are utilized in both the first and second conduction paths, allowing them to handle power in multiple operational modes, thereby improving overall power handling performance without increasing component size.
3Productivity
If the switching frequency is increased to improve productivity, then the power conversion speed increases, but the switching losses increase and power handling is limited
Solution Approach 1:
The patent employs periodic switching between different conduction paths in a controlled sequence. The first conduction path operates during a first time period, followed by the second conduction path during a second time period. This periodic action allows the circuit to maintain high power conversion speed through frequent switching cycles while reducing instantaneous switching losses by distributing the switching events across different paths and optimizing each transition.
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 design enhances power handling capability even with reduced component sizes, minimizing switching losses and optimizing power transmission to the load.
Implementation Method 1
charging the inductor with a first current before charging the capacitor causing a second current to flow in the inductor and (2) charging the inductor with a third current before discharging the capacitor causing a fourth current to flow in the inductor
Implementation Method 2
a capacitor coupled between the first node and the third node
Data Source
AI summary
A power conversion circuit includes an input terminal, a first switching element, a second switching element, a third switching element, a fourth switching element, a capacitor; an inductor; and a controller configured to control the switching elements to be switched ON/OFF, such that a voltage at the load is regulated by repetitively (1) charging the inductor with a first current before charging the capacitor causing a second current to flow in the inductor and (2) charging the inductor with a third current before discharging the capacitor causing a fourth current to flow in the inductor.