Asymmetrical Half-Bridge Flyback Control for Lower Capacitor Current
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Solution Overview
Problem
Conventional Hybrid flyback (HFB) power converters face limitations in high-power applications due to larger input and output capacitor currents and lack of duty cycle control, restricting their use in very high power applications.
Innovation Solution
A controller is used to manage a pair of asymmetrical half-bridge flyback power converters, controlling switching operations to regulate output voltage by adjusting duty cycles and switching frequencies, and implementing feedback loops to balance currents and equalize output voltages across multiple power converter phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional Hybrid flyback power converters are used, then the structure is simple, but the capacitor currents are larger and duty cycle control is limited
Solution Approach 1:
The patent divides the single HFB converter into multiple parallel HFB converters (first, second, third, and fourth converters). Each converter handles a portion of the total power, which reduces the current through individual input and output capacitors. The segmentation allows duty cycle control in each parallel branch while maintaining overall system simplicity.
2Device complexity
If conventional Hybrid flyback power converters are used, then the structure is simple, but duty cycle control is limited
Solution Approach 1:
By segmenting the power conversion function across multiple parallel HFB converters, the patent enables independent duty cycle control in each branch. This segmentation provides adaptability for high-power applications while keeping each individual converter unit simple and maintaining the inherent HFB structure benefits.
3Quantity of substance
If multiple parallel HFB converters are used, then capacitor currents are reduced and duty cycle control is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple HFB converter units in parallel configuration, where each unit shares the total power handling responsibility. This combining approach reduces individual capacitor currents while the unified control strategy manages the overall system, balancing complexity reduction through standardization with performance improvement through parallel operation.
Solution Approach 2:
The patent employs identical HFB converter topologies for all parallel branches, making each unit universal and interchangeable. This universality simplifies design, manufacturing, and maintenance while enabling scalable power capacity. The control system implements multi-functionality by managing both individual branch operation and overall system coordination.
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 approach reduces capacitor currents, enhances control over output voltage, and allows for more efficient operation in high-power applications by dynamically managing energy transfer across multiple power converter phases.
Implementation Method 1
energy is transferred from a corresponding transformer and a resonant capacitor through a primary winding to a secondary winding
Implementation Method 2
energy is transferred from a corresponding transformer and a resonant capacitor through a primary winding to a secondary winding
Data Source
AI summary
A power supply controller is operative to: control switching of a first asymmetrical half bridge flyback power converter to supply first current from a secondary winding SW1 of the first asymmetrical half bridge flyback power converter during a first portion of a switch control cycle to produce an output voltage, the first asymmetrical half bridge flyback power converter operative to block the first current through the secondary winding SW1 during a second portion of the control cycle; and control switching of a second asymmetrical half bridge flyback power converter to supply second current from a secondary winding SW2 of the second asymmetrical half bridge flyback power converter during a second portion of the switch control cycle to produce the output voltage, the second asymmetrical half bridge flyback power converter operative to block the second current through the secondary winding SW2 during the first portion of the control cycle.