Synchronous Rectifier Pulse Control for Resonant Converter Efficiency
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Solution Overview
Problem
Existing synchronous rectifying circuits for resonant power converters suffer from additional power consumption due to saturable inductors, which hampers efficiency.
Innovation Solution
A synchronous rectifying circuit is developed, featuring a pulse-signal generation circuit that generates shorter pulse signals to control power transistors via an isolation device like a pulse transformer or capacitors, reducing power consumption and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If synchronous rectifier is applied on the secondary side of the power transformer, then power conversion efficiency is improved, but additional power consumption is caused by saturable inductors
Solution Approach 1:
The invention extracts and eliminates the saturable inductor component from the synchronous rectifier circuit. By removing this power-consuming component while retaining the essential rectification function through alternative means, the patent resolves the contradiction between achieving high efficiency and avoiding additional power consumption.
Solution Approach 2:
The patent introduces an intermediary control mechanism that uses pulse signals generated from the switching signal to control the synchronous rectifier operation. This intermediary control system enables the rectifier to operate efficiently without requiring the power-consuming saturable inductor, thus resolving the energy consumption issue while maintaining efficiency benefits.
2Loss of energy
If pulse width of the pulse signal is made shorter than the switching signal, then power consumption is reduced and efficiency is improved, but control precision requirements increase
Solution Approach 1:
The invention employs periodic pulse signals with controlled widths that are shorter than the switching signal period. By using periodic action with optimized pulse width, the system achieves reduced power consumption while the regular periodic nature provides inherent timing reference that helps manage control precision requirements.
Solution Approach 2:
The patent incorporates feedback mechanisms in the pulse-signal generation circuit that monitor and adjust the pulse width and timing. This feedback control ensures that the shorter pulse signals maintain optimal width for power reduction while automatically compensating for any control precision variations, thus resolving the contradiction between power reduction and precision requirements.
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 enhances the efficiency of resonant power converters by minimizing power consumption and optimizing switching operations, achieving better performance with reduced components and costs.
Implementation Method 1
An isolation device, such as a pulse transformer or capacitors, is coupled to the pulse-signal generation circuit to transfer the pulse signal from the primary side of the power transformer to the secondary side of the power transformer
Implementation Method 2
A power transistor is connected between the rectifying terminal and the ground terminal. The first input terminal and the second input terminal are coupled to receive the pulse signal for turning on/off the power transistor
Data Source
AI summary
A synchronous rectifying circuit is provided for resonant power converter. An integrated synchronous rectifier comprises a rectifying terminal, a ground terminal a first input terminal and a second input terminal. The rectifying terminal is coupled to the secondary side of a power transformer. The ground terminal is coupled to the output of the power converter. A power transistor is connected between the rectifying terminal and the ground terminal. The first input terminal and the second input terminal are coupled to receive a pulse signal for turning on/off the power transistor. A pulse-signal generation circuit includes an input circuit coupled to receive the switching signal for switching the power transformer of the power converter.