Boost and Resonant Converter Control for Multi-Voltage Efficiency
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Solution Overview
Problem
Conventional power conversion devices with electric current resonant converters subsequent to a boost converter experience efficiency reduction when dealing with two or more types of input voltage levels.
Innovation Solution
A power conversion device comprising a boost converter, an electric current resonant converter connected subsequent to the boost converter, and a control circuit that adjusts the output voltage of the boost converter to either a first or second output voltage level based on detected input voltage, and operates the electric current resonant converter in full-bridge or half-bridge modes accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the electric current resonant converter operates in a fixed mode, then the circuit structure is simple, but the conversion efficiency decreases when input voltage levels vary
Solution Approach 1:
The patent implements dynamic operating mode switching in the electric current resonant converter based on detected input voltage levels. The control circuit automatically selects between different operating modes (e.g., full-bridge, half-bridge) to optimize conversion efficiency for each input voltage level, transforming the static converter into a dynamic adaptive system that maintains high efficiency across varying input conditions.
Solution Approach 2:
The patent changes operational parameters of the electric current resonant converter by switching between different operating modes according to input voltage levels. Each operating mode corresponds to specific parameter settings (switching frequencies, voltage levels, current paths) that are optimized for particular input voltage ranges, thereby maintaining high conversion efficiency across multiple input voltage levels.
2Adaptability or versatility
If the output voltage of the boost converter is set to multiple levels, then the adaptability to different input voltages is improved, but the control complexity increases
Solution Approach 1:
The control circuit performs preliminary detection of the input voltage level and pre-selects the appropriate operating mode and output voltage level before the power conversion process begins. This preliminary action allows the system to be pre-configured for the specific input conditions, avoiding complex real-time adjustments during operation and simplifying the overall control architecture.
Solution Approach 2:
The patent employs feedback mechanisms where the control circuit continuously monitors the input voltage level and automatically adjusts the output voltage level and operating mode accordingly. This closed-loop feedback system simplifies control by allowing the system to self-regulate based on detected conditions, maintaining adaptability without requiring complex manual intervention or overly sophisticated control algorithms.
Data Source
AI summary
In a power conversion device, a control circuit sets an output voltage of a boost converter to a first output voltage level or a second output voltage level in accordance with a voltage corresponding to the input voltage, causes an electric current resonant converter to operate in a full-bridge mode as an operating mode when the first output voltage level has been set, and causes the electric current resonant converter to operate in a half-bridge mode as an operating mode when the second output voltage level has been set. The first output voltage level or the second output voltage level is set at a predetermined timing after the input voltage is input and a set operating mode is maintained until a process of setting the first output voltage level or the second output voltage level is reset.