Bias-flip synchronized switch damping technique for enhanced and adaptive vibration attenuation

The synchronized switch damping (SSD) technique has garnered significant attention for its broadband efficacy and high performance. However, the low circuit quality of the SSD on inductor (SSDI) circuit and the instability issue associated with the SSD on voltage (SSDV) circuit limit their widespread applications. To address these issues, this study proposes an SSD on bias-flip (SSDBF) circuit. By incorporating a bias capacitor, the voltage inversion process is segmented into three phases through different LC loops, significantly enhancing the voltage inversion factor γ. Moreover, the bias voltage autonomously adjusts to the external excitation levels, eliminating the need for auxiliary monitoring and energy sources. A theoretical model and an equivalent circuit model (ECM) are developed to analyze the superiority of the SSDBF circuit across a wide frequency range. Both theoretical and simulation results demonstrate that the SSDBF circuit outperforms the traditional SSDI circuits, particularly in cases with low coupling coefficients and voltage inversion factors, while maintaining self-adaptivity across varying excitation conditions. Finally, experimental results validate the enhanced vibration attenuation and self-adaptivity of the SSDBF circuit, underscoring its great potential as a robust and efficient solution for advanced vibration control in various applications.