Selectable Transformer Secondary Topologies for Wide Output Voltage
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Solution Overview
Problem
Existing power systems with LLC topology struggle to maintain high efficiency across a wide range of output voltages, leading to decreased efficiency and increased output ripple and noise when operating outside the designated voltage range.
Innovation Solution
A power system with a control circuit that includes a third secondary switch and a mode determining circuit, which adjusts the operation between LLC and asymmetrical half-bridge flyback converter topologies based on output voltage feedback, ensuring efficient voltage conversion across varying output voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LLC topology is used for high-power power systems, then the structure is simple and switching loss is low, but the system cannot maintain high efficiency in the entire wide voltage range
Solution Approach 1:
The patent divides the single LLC topology into multiple topology segments (first voltage conversion circuit with LLC topology and second voltage conversion circuit with flyback topology). Each segment handles a specific voltage range, allowing the system to maintain high efficiency across the entire wide voltage range while keeping each segment's structure relatively simple
Solution Approach 2:
The patent implements dynamic topology switching based on the output voltage range. The control circuit dynamically selects which voltage conversion circuit to use (first or second) depending on whether the required voltage falls within the first or second voltage range, enabling the system to adapt to varying voltage requirements while maintaining optimal efficiency
2Loss of energy
If LLC topology is used, then switching loss is low, but efficiency decreases when operating outside the designated voltage range
Solution Approach 1:
The patent applies different topology characteristics to different voltage ranges. The first voltage conversion circuit (LLC topology) is optimized for the first voltage range, while the second voltage conversion circuit (flyback topology) is optimized for the second voltage range. This ensures that each circuit operates in its optimal efficiency zone, maintaining low switching loss and stable efficiency across the entire voltage range
3Adaptability or versatility
If output voltage range is widened to meet different electronic device requirements, then the power system can supply more devices, but efficiency decreases and output ripple and noise increase
Solution Approach 1:
The patent segments the wide voltage range into two distinct ranges, each handled by a specialized voltage conversion circuit. This segmentation allows each circuit to be optimized for its specific range, maintaining low output ripple and noise within each range while collectively covering the entire wide voltage range required by different electronic devices
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 system maintains high efficiency and reduces output ripple and noise by dynamically switching between topologies, optimizing performance across a wide output voltage range.
Implementation Method 1
The power system could realize AC to DC voltage conversion and DC to DC voltage conversion
Data Source
AI summary
A power system having a first secondary switch, a second secondary switch and a third secondary switch is provided. The first secondary switch is configured to be coupled to a first secondary winding of a transformer. The second secondary switch is configured to be coupled to a second secondary winding of the transformer. The third secondary switch is coupled in series with the second secondary switch. The third secondary switch is controlled based on an output voltage of the power system.