Flyback Converter Driver for Resonant Capacitor Discharge
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Solution Overview
Problem
Traditional flyback switch converters face reliability issues due to residual charges in the resonant capacitor when shut down, which can cause large currents upon restart, affecting device reliability and increasing system complexity and cost.
Innovation Solution
A flyback switch converter with a control circuit that includes a driver for overcurrent detection and a discharge path for the resonant capacitor, allowing for residual charge release during shutdown or protection states, integrating overcurrent detection and discharge functions to reduce system complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the traditional AHB converter is shut down, then power consumption is reduced, but residual charges remain in the resonant capacitor causing large currents upon restart that affect device reliability
Solution Approach 1:
The patent applies preliminary action by providing a discharge path for the resonant capacitor before the AHB converter is restarted. The driver circuit proactively discharges residual charges from the resonant capacitor when shutdown occurs, preventing the harmful large currents that would otherwise flow upon restart. This preliminary discharge action eliminates the reliability issue caused by residual charges.
2Reliability
If a separate discharge circuit is added to release residual charges, then device reliability is improved, but system complexity and cost increase
Solution Approach 1:
The patent applies universality by designing the driver circuit to perform multiple functions: it provides overcurrent detection during normal operation and simultaneously serves as a discharge path for the resonant capacitor during shutdown. By making the driver circuit multi-functional, the patent eliminates the need for a separate discharge circuit, thereby improving reliability while avoiding increased system complexity.
Solution Approach 2:
The patent merges the overcurrent detection function and the resonant capacitor discharge function into a single driver circuit. The discharge path is integrated within the existing driver circuitry, combining what would traditionally be separate functions into one unified circuit, thus reducing overall system complexity while maintaining reliability.
3Reliability
If the driver performs overcurrent detection, then power output safety is improved, but the driver complexity increases
Solution Approach 1:
The patent applies universality by designing the driver circuit to perform multiple functions: it provides overcurrent detection during normal operation and simultaneously serves as a discharge path for the resonant capacitor during shutdown. By making the driver circuit multi-functional, the patent eliminates the need for a separate discharge circuit, thereby improving reliability while avoiding increased system complexity.
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 effectively releases residual charges on the resonant capacitor, enhancing system reliability and reducing complexity and cost by utilizing the overcurrent detection line for discharge during non-detection periods.
Implementation Method 1
an energy consumption element, having a first terminal coupled to a reference ground, and a second terminal coupled to the resonant capacitor via the second switch element
Data Source
AI summary
The present application relates to a flyback switch converter and a control circuit thereof; the control circuit comprises: a control signal generation module for providing a first control signal; a driver, for supplying a first switch transistor with a first driving signal according to the first control signal, so as to control the turning-on and off of the first switch transistor; the driver is further for performing overcurrent detection according to the voltage drop across the first switch transistor when the flyback switch converter performs the power output, and supplying a resonant capacitor with a discharge path when the flyback switch converter is shut down or enters the protection state. The present application can discharge residual charges on the resonant capacitor when the system is shut down or enters the protection state, and the system is less complex and with lower cost.