Asymmetric Half-Bridge Switching Based on Resonance End Current
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Solution Overview
Problem
Asymmetric half-bridge converters face challenges in maintaining efficient operation under varying load conditions, affecting their power conversion efficiency.
Innovation Solution
An asymmetric half-bridge converter design incorporating a switch circuit, resonance tank, and current sensor, where a controller performs switching operations based on the ending current value of the resonance current waveform, allowing the converter to automatically adapt to different load conditions by switching between light and heavy load modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the AHB converter operates with fixed switching parameters, then the circuit structure remains simple, but the power conversion efficiency deteriorates under varying load conditions
Solution Approach 1:
The patent implements dynamic switching parameters that automatically adjust based on load conditions. The controller monitors the resonance current waveform and dynamically changes switching parameters (such as switching frequency or duty cycle) to maintain optimal power conversion efficiency across different load conditions, transforming the fixed parameter system into a dynamic adaptive system.
Solution Approach 2:
The patent changes switching parameters (frequency, duty cycle, or timing) based on detected load conditions. By monitoring the resonance current waveform characteristics and adjusting switching parameters accordingly, the system optimizes power conversion efficiency without requiring complex hardware reconfiguration, thus resolving the contradiction between simplicity and efficiency.
2Loss of energy
If the AHB converter uses adaptive switching operations, then the power conversion efficiency improves under varying load conditions, but the control complexity increases
Solution Approach 1:
The patent employs feedback control by monitoring the resonance current waveform and using this information to adjust switching operations. The controller detects load conditions through current waveform analysis and feeds this information back to modify switching parameters, creating a closed-loop control system that adapts to varying loads while maintaining efficiency.
Solution Approach 2:
The system performs self-adjustment by automatically detecting load conditions through resonance current waveform monitoring and autonomously changing switching parameters without external intervention. This self-service mechanism reduces the need for complex external control systems while maintaining optimal efficiency across different operating conditions.
3Productivity
If the converter instantly adapts to different load conditions, then the power conversion efficiency is optimized, but the sensing and control precision requirements increase
Solution Approach 1:
The patent utilizes resonance phenomena in the power converter circuit, where the resonance tank creates characteristic current waveforms at specific frequencies. By monitoring these resonance waveforms, the system can detect load conditions through relatively simple sensing, as the resonance characteristics provide natural, amplified signals that are easier to detect with lower precision requirements compared to direct power or current measurements.
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
Enables the converter to instantly adjust its operation to suit varying load conditions, optimizing power conversion efficiency and reducing power consumption in light load states while enhancing output power in heavy load states.
Implementation Method 1
The resonance tank is coupled between the connection node and a ground end. The current sensor senses a waveform of a resonance current flowing through the resonance tank to generate a sensing result. The waveform of the resonance current responds to a load condition.
Data Source
AI summary
An asymmetric half-bridge converter is provided. The asymmetric half-bridge converter includes a switch circuit, a resonance tank, a current sensor, and a controller. The current sensor senses a waveform of a resonance current flowing through the resonance tank to generate a sensing result. The controller determines the sensing result. When the sensing result indicates that an ending current value of a primary resonance waveform of the resonance current is greater than a predetermined value, the controller performs a first switching operation on the switch circuit. When the sensing result indicates that the ending current value of the primary resonance waveform is less than or equal to the predetermined value, the controller performs a second switching operation on the switch circuit.