Synchronous Rectifier Drive Circuit with Energy Feedback
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Solution Overview
Problem
Conventional synchronous rectifier drive circuits face inefficiencies due to high voltage stress and energy loss when using low voltage MOSFETs in high voltage applications, particularly in voltage doubler rectifiers, where energy feedback is not feasible with traditional current-driven rectifiers.
Innovation Solution
A current-driven synchronous rectifying drive circuit with an energy feedback circuit, including a clamp and energy feedback circuit, a high frequency transformer, a current transducer, an energy storage capacitor, and two synchronous rectifiers, allows for the clamping of driving voltage and feedback of redundant energy to the energy storage capacitor, improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional current-driven rectifiers are used, then driving voltage can be provided, but energy feedback is not feasible and one SR drive circuit must be ground-floated
Solution Approach 1:
The patent makes both synchronous rectifier drive circuits capable of receiving driving signals and participating in energy feedback. By providing separate feedback paths for both drive circuits through the feedback winding, the system eliminates the ground-floated constraint and enables universal functionality across both rectifiers.
2Ease of manufacture
If the number of turns in the current transducer is reduced to lower cost, then manufacturing cost decreases, but driving energy may be insufficient
Solution Approach 1:
The patent merges the driving function and energy feedback function into a unified system. The feedback winding is coupled to the same transformer that provides driving energy, allowing the system to compensate for reduced transducer turns by recovering and redistributing energy through the feedback path, thus maintaining sufficient driving power while reducing cost.
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 reduces energy loss and improves driving efficiency by enabling energy feedback, reducing the number of turns in the current transducer and lowering costs, while being applicable in various high voltage applications.
Implementation Method 1
A current-driven synchronous rectifying drive circuit with an energy feedback circuit, including a clamp and energy feedback circuit, a high frequency transformer, a current transducer, an energy storage capacitor
Implementation Method 2
the clamp and energy feedback circuit, a high frequency transformer, a current transducer, an energy storage capacitor, an output capacitor, a first and a second synchronous rectifier... clamping of driving voltage
Implementation Method 3
A current-driven synchronous rectifying drive circuit with an energy feedback circuit, including a clamp and energy feedback circuit, a high frequency transformer, a current transducer
Data Source
AI summary
A current-driven synchronous rectifying drive circuit designed for a T-type voltage doubler rectifier with an energy feedback circuit including a clamp and energy feedback circuit, a high frequency transformer, a current transducer, an energy storage capacitor, an output capacitor, a first and a second synchronous rectifier, and a first drive circuit connected to the first synchronous rectifier and a second drive circuit connected to the second synchronous rectifier.