Resonant Flyback Converter Controller Power via LC Resonator
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Solution Overview
Problem
Conventional power converters, such as asymmetric pulse-width modulation half bridge (APWM HB) flyback converters, require auxiliary windings to supply power to controllers, which increase manufacturing costs and space requirements, especially when operating at different output voltages.
Innovation Solution
A power converter design that utilizes a capacitor coupled to the primary winding of a transformer, forming an LC resonator with the leakage inductance, to supply power to the controller, eliminating the need for auxiliary windings by deriving the supply voltage from the capacitor, which maintains stable voltage variations suitable for powering the controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If auxiliary windings are used to supply power to the controller, then the controller can operate reliably, but the device complexity and manufacturing costs increase
Solution Approach 1:
The patent makes the capacitor serve multiple functions: it acts as both the resonant capacitor in the LC circuit and the power supply capacitor for the controller. By coupling the capacitor to both the primary winding and the controller's supply voltage terminal, the same component provides both resonant function and power supply function, eliminating the need for separate auxiliary windings.
Solution Approach 2:
The patent merges the power supply function with the existing resonant capacitor. Instead of having separate auxiliary windings dedicated to power supply, the design combines the resonant capacitor and power supply capacitor into a single component, thereby reducing the number of parts and simplifying the transformer structure.
2Reliability
If auxiliary windings are used to supply power to the controller, then the controller can operate reliably, but the space requirements increase
Solution Approach 1:
The capacitor performs dual functions as both the resonant element and the power supply source for the controller. This multi-functionality eliminates the need for additional auxiliary windings that would occupy extra space on the transformer, thereby reducing the overall transformer area while maintaining reliable controller operation.
3Adaptability or versatility
If multiple auxiliary windings are used for different output voltages, then the converter can operate at different output voltages, but the device complexity and manufacturing costs increase
Solution Approach 1:
The patent employs a resonant circuit with adjustable parameters (capacitor value, switching frequency) to adapt to different output voltage requirements. Instead of using multiple fixed auxiliary windings for different voltages, the resonant frequency and impedance can be dynamically adjusted by changing the capacitor value or switching frequency, allowing the same transformer structure to operate at different output voltages.
Solution Approach 2:
The patent changes the operating parameters of the resonant circuit (capacitor capacitance value, switching frequency) to adapt to different output voltage conditions. By adjusting these parameters, the converter can maintain proper resonant operation across different output voltages without requiring multiple auxiliary windings, thereby reducing device complexity while maintaining versatility.
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 design reduces the need for auxiliary windings, minimizing space and manufacturing costs while maintaining a stable supply voltage for the controller, even across varying output voltages, by leveraging the LC resonator's resonant frequency to provide a consistent voltage source.
Implementation Method 1
an LC resonator of the power converter includes the capacitor and a leakage inductivity of the transformer
Data Source
AI summary
Power converters are provided. A capacitor is coupled to a primary winding of a transformer forming part of an LC resonator. The capacitor is coupled with a supply voltage input (Vcc) of a controller to supply at least part of the controller with power.