Asymmetric Half-Bridge Flyback Converter With Bidirectional Current Blocking

The patent applies dynamics by making the resonant capacitor adjustable through a switching mechanism. The capacitor can be reconfigured between different capacitance values (e.g., C1 alone, C1+C2, or C1+C3) depending on the operating conditions and output voltage requirements. This dynamic adjustment allows the resonant tank to maintain optimal performance across varying load conditions without requiring complex continuous control mechanisms.

The patent changes the electrical parameter of capacitance in the resonant tank by providing multiple capacitor configurations. The controller selectively connects different capacitor combinations to the resonant circuit based on detected output voltage or load conditions. This parameter change enables the system to adapt to different operating points, reducing current losses at low output voltages while maintaining simplicity through discrete switching rather than continuous adjustment.

The patent implements dynamic control of the demagnetization phase by using a controller that detects output voltage or load conditions and adjusts the switching timing accordingly. The controller can extend or reduce the third phase (full demagnetization phase) duration based on real-time operating conditions, allowing optimal energy transfer without requiring overly complex control mechanisms. The dynamic adjustment is achieved through simple timing control of the switching devices.

The patent employs feedback control where the controller monitors the output voltage or load conditions and uses this information to adjust the demagnetization timing. The controller detects when the magnetizing current has sufficiently decreased and uses this feedback to determine when to terminate the third phase. This feedback mechanism ensures efficient energy transfer while keeping the control logic relatively simple, as it relies on detecting natural circuit state transitions rather than complex calculations.