Flyback Converter Oscillation Reduction Control Module
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Solution Overview
Problem
Conventional flyback converters operate in discontinuous conduction mode, leading to resonance voltages that cause electromagnetic interference (EMI) exceeding safety regulations, and traditional solutions like RC damping are not precise enough, while also consuming power and reducing efficiency.
Innovation Solution
A power conversion apparatus with an oscillation reduction control module that detects resonance voltages and uses a damper to rapidly decay their amplitude, integrated with the secondary-side controller to reduce EMI and improve efficiency without external passive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional flyback converters are operated in discontinuous conduction mode, then power delivery control is achieved, but resonance voltage causes electromagnetic interference exceeding safety regulations
Solution Approach 1:
The patent detects the harmful resonance voltage and intentionally generates a counter-phase voltage through the oscillation reduction control module. This counter-voltage actively cancels the resonance voltage, converting the harmful EMI into a beneficial cancellation effect that suppresses the resonance without affecting the power delivery function
Solution Approach 2:
The oscillation reduction control module acts as an intermediary between the power switch and the resonance phenomenon. It detects the resonance voltage and generates a compensating signal that interferes with the resonance, effectively mediating between the discontinuous conduction mode operation and the EMI suppression requirement
2Object-affected harmful factors
If an RC damping shock absorber is installed on the primary side, then resonance voltage amplitude is absorbed, but power consumption increases and efficiency decreases
Solution Approach 1:
The patent implements a feedback mechanism where the oscillation reduction control module continuously detects the resonance voltage and adjusts the counter-phase voltage in real-time. This active feedback control suppresses resonance only when needed, avoiding continuous power consumption associated with passive RC damping components
Solution Approach 2:
The patent replaces the passive mechanical RC damping shock absorber with an active electronic control system. Instead of using resistive components to dissipate energy, the system uses electronic voltage generation to cancel the resonance, significantly reducing power loss
3Object-affected harmful factors
If an RC damping shock absorber is installed on the primary side, then some resonance suppression is achieved, but the suppression effect is not precise enough
Solution Approach 1:
The oscillation reduction control module uses real-time detection of resonance voltage characteristics (amplitude, frequency, phase) to dynamically adjust the counter-phase voltage. This feedback control enables precise suppression tailored to the actual resonance conditions, unlike fixed-parameter RC damping
Solution Approach 2:
The system dynamically changes the parameters of the counter-phase voltage (amplitude, phase angle, timing) based on the detected resonance characteristics. This allows precise adaptation to varying resonance conditions, achieving superior suppression precision compared to static RC damping networks
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 solution effectively reduces EMI to meet safety standards across the full frequency band, enhances efficiency by minimizing power consumption, and allows for programmable damping parameters and light-load frequency hopping, integrating seamlessly with existing transformer controllers.
Implementation Method 1
the parasitic capacitance based on the power switch at the primary side will resonate with the magnetizing inductance. The resonance generates a resonance voltage
Implementation Method 2
the oscillation reduction control module performs an oscillation reduction operation to the resonance voltage to reduce an amplitude of the resonance voltage by a damper
Data Source
AI summary
A power conversion apparatus with oscillation reduction control supplies power to a load through an output end. The power conversion apparatus includes a transformer, a power switch, a control module, and an oscillation reduction control module. A primary side of the transformer receives an input voltage, and a secondary side of the transformer is coupled to the output end. The power switch is coupled to the primary side. The control module is coupled to the power switch, controls the power switch continuously turning on and turning off, and converts the input voltage into an output voltage. When the oscillation reduction control module detects a resonance voltage through the secondary side, the oscillation reduction control module performs an oscillation reduction operation to the resonance voltage to reduce an amplitude of the resonance voltage by a damper.