AHB Flyback Resonant Control for Wide-Range Output Voltage
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Solution Overview
Problem
The AHB flyback conversion circuit's resonance parameter changes with output voltage variations, leading to inefficient control of the main and auxiliary power transistors, affecting conversion efficiency in DC-DC voltage converters.
Innovation Solution
A voltage conversion apparatus with an asymmetrical half-bridge conversion unit and control circuit that monitors output voltage changes, adaptively detects and updates the resonant period, adjusting drive signals to improve efficiency across a wide range of outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the AHB flyback conversion circuit uses fixed resonance parameters for control, then the device complexity is reduced, but the conversion efficiency deteriorates when output voltage changes
Solution Approach 1:
The patent implements dynamic detection and updating of the resonant period based on real-time output voltage changes. The control circuit continuously monitors the output voltage and adaptively adjusts the resonant period parameter, transforming the fixed control approach into a dynamic one that maintains high conversion efficiency across wide output voltage ranges.
Solution Approach 2:
The patent employs feedback mechanisms where the control circuit detects output voltage changes and uses this information to adaptively update the resonant period. This closed-loop feedback ensures that the resonance parameters remain optimized even as operating conditions change, resolving the contradiction between simple fixed control and efficient adaptive control.
2Loss of energy
If the resonant period is adaptively detected and updated based on output voltage changes, then the conversion efficiency is improved, but the device complexity increases
Solution Approach 1:
The control circuit performs self-service by automatically detecting output voltage changes and autonomously updating the resonant period parameter without external intervention. This self-adjusting mechanism improves conversion efficiency while minimizing the need for additional complex external control systems.
Solution Approach 2:
The patent changes the resonant period parameter adaptively based on output voltage conditions. By dynamically adjusting this key parameter rather than keeping it fixed, the system achieves high conversion efficiency across varying output voltages while using a relatively simple control approach.
3Adaptability or versatility
If the parasitic capacitors change with output voltage, then the adaptability to wide-range output is improved, but the resonance parameter stability deteriorates
Solution Approach 1:
The patent embraces the dynamic nature of parasitic capacitors by continuously detecting output voltage changes and adaptively updating the resonant period. Rather than trying to maintain fixed resonance parameters, the system dynamically adjusts to the changing capacitor values, maintaining both adaptability to wide output ranges and effective resonance control.
Solution Approach 2:
The control circuit uses feedback from output voltage detection to compensate for changes in parasitic capacitors. By continuously monitoring and adjusting the resonant period based on actual operating conditions, the system maintains stable resonance performance despite variations in capacitor values across different output voltage levels.
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
Enhances conversion efficiency by adaptively detecting and updating the resonant period, ensuring optimal control of switching transistors based on output voltage changes.
Implementation Method 1
Parasitic capacitors, resonant capacitors, and resonant inductors of the main power transistor and the auxiliary power transistor, and an excitation inductor on a primary side of the transformer resonate together
Data Source
AI summary
A voltage conversion apparatus, a control method, and a power supply device. The voltage conversion apparatus includes a control circuit. The control circuit is configured to: obtain a first sampling voltage and a second sampling voltage; detect a resonant period based on the second sampling voltage when it is determined, based on the first sampling voltage, that a voltage range of an output voltage of the voltage conversion apparatus changes and a voltage threshold is exceeded; and output a drive signal based on the detected resonant period. The drive signal is used to control turn-on and turn-off of a first switching transistor and a second switching transistor.