Auxiliary-Winding Synchronous Rectifier Circuit for Stable Converter Power
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Solution Overview
Problem
Existing power converter circuits using switching power supplies face inefficiencies and size constraints due to the need for multiple windings and voltage fluctuations, which are not effectively addressed by current synchronous rectifier technologies.
Innovation Solution
The implementation of a power converter circuit that utilizes an auxiliary winding to power the synchronous rectifier controller, where the auxiliary winding has the same direction as the primary winding and opposite to the secondary winding, reducing the number of turns and fluctuation in power supply voltage, and employing gallium nitride (GaN) based transistors for efficient switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional switching power supplies are used, then power conversion efficiency is relatively high, but the transformer size and weight increase
Solution Approach 1:
The patent combines the auxiliary winding function with the synchronous rectifier controller power supply function. The auxiliary winding is configured to provide power to the synchronous rectifier controller during specific switching phases, merging the power provision function into the existing transformer structure, thereby reducing the need for separate power supply components and reducing overall transformer size and weight while maintaining high power conversion efficiency
2Productivity
If multiple windings are used in the transformer, then power conversion functionality is improved, but the transformer size and complexity increase
Solution Approach 1:
The auxiliary winding is designed to serve multiple functions: it provides power to the synchronous rectifier controller during the first time period when the first switch is closed, and can also contribute to the second time period when the second switch is closed. This multi-functionality reduces the need for separate dedicated windings for each function, thereby reducing transformer size and complexity while maintaining full power conversion functionality
Solution Approach 2:
The patent segments the power provision function across different time periods and switching phases. The auxiliary winding provides power during the first time period (when first switch is closed) and the system utilizes the second time period (when second switch is closed) for additional power delivery. This temporal segmentation allows efficient use of the auxiliary winding turns, reducing the total number of turns required compared to continuous power provision designs
3Reliability
If auxiliary windings are used to power synchronous rectifier, then controller power supply is improved, but voltage fluctuation increases
Solution Approach 1:
The system employs periodic action by operating in distinct time periods: first time period when the first switch is closed and auxiliary winding provides power to the controller, and second time period when the second switch is closed. This periodic switching pattern allows the auxiliary winding to deliver power in controlled pulses rather than continuously, reducing voltage fluctuations while ensuring reliable controller power supply. The controller is designed to operate from this periodically delivered power
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 configuration enhances the operational performance by minimizing voltage deviation and reducing the number of auxiliary winding turns, leading to improved power conversion efficiency and reduced size, while maintaining high efficiency across varying input voltages.
Implementation Method 1
an auxiliary winding extending between a fourth terminal and the third terminal
Data Source
AI summary
A circuit. The circuit includes a transformer having a primary winding extending between a first terminal and a second terminal, and a secondary winding extending between a third terminal and a first output terminal, and an auxiliary winding extending between a fourth terminal and the third terminal; a first switch having a first gate terminal, a first source terminal and a first drain terminal, the first drain terminal coupled to the second terminal and the first source terminal coupled to a power source; a second switch having a second gate terminal, a second source terminal and a second drain terminal, the second source terminal coupled to the third terminal and the second drain terminal coupled to a second output terminal, the secondary winding having a winding direction opposite to that of the primary winding and the auxiliary winding having a winding direction same as that of the primary winding.