Dual Primary Secondary Regulating Flyback Converter
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Solution Overview
Problem
Conventional voltage regulation methods in flyback converters either result in complex and costly secondary side regulating circuits for precise voltage control or simplified but inaccurately controlled primary side regulating circuits with low response speed.
Innovation Solution
Implementing two independent controllers in both the primary and secondary side regulating circuits to actively exchange messages and dominate output voltage modulation, allowing for precise control and increased response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If secondary side regulating method is used, then output voltage precision is improved, but device complexity and cost increase due to photocoupler and regulator IC requirements
Solution Approach 1:
The patent extracts the voltage regulation function from the secondary side and implements it on the primary side through PSR technology. By taking out the complex secondary side regulation components (photocoupler, regulator IC) and relocating the regulation logic to the primary side, the invention achieves precise voltage control without requiring expensive isolation components, thus resolving the contradiction between precision and complexity
Solution Approach 2:
The patent introduces an auxiliary winding as an intermediary element that couples the primary and secondary sides magnetically. This auxiliary winding provides the necessary feedback signal to the primary side controller without requiring galvanic isolation components like photocouplers, enabling precise regulation while simplifying the overall circuit topology
2Device complexity
If primary side regulating method is used, then device complexity is reduced, but output voltage precision and response speed deteriorate due to delayed voltage variance detection
Solution Approach 1:
The patent implements preliminary action by detecting voltage variances on the primary side before they propagate to the secondary side. The PSR controller continuously monitors the auxiliary winding voltage and proactively adjusts the primary switch duty cycle in advance, eliminating the delayed response inherent in conventional primary side regulation and achieving both simplicity and precision
Solution Approach 2:
The patent establishes a real-time feedback loop on the primary side by sampling the auxiliary winding voltage and comparing it with the reference voltage. This feedback mechanism enables the PSR controller to detect output voltage variances immediately and adjust the switching duty cycle dynamically, achieving precise voltage control without the one-period delay of conventional methods
3Device complexity
If conventional primary side regulating method is used, then device complexity is reduced, but response speed decreases because voltage variance detection occurs only in the next operation period
Solution Approach 1:
The patent ensures continuity of useful action by implementing continuous voltage monitoring and real-time adjustment on the primary side. The PSR controller continuously samples the auxiliary winding voltage during each switching cycle and immediately adjusts the duty cycle, eliminating the discrete one-period delay of conventional primary side regulation and achieving both simplicity and fast response
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
Enables accurate and responsive output voltage modulation by actively engaging both primary and secondary side circuits, improving the precision and speed of voltage control in flyback converters.
Implementation Method 1
The primary side voltage Vp and the secondary side voltage Vs are in charge of storing and releasing magnetic energy through the coupling of a first winding (indicated as Np) and a second winding (Indicated as Ns)
Data Source
AI summary
A method for modulating a voltage through a primary side regulating circuit and a secondary side regulating circuit, the method includes: providing a first controller in the primary side regulating circuit; providing a second controller in the secondary side regulating circuit; exchanging messages between the first controller and the second controller thereby alternately dominating a modulation of an output voltage between the primary side regulating circuit and the secondary side regulating circuit in accordance with the messages.