Figure 5

Simulations. (a) Current responses of SD current source with various initial voltages of supercapacitors. (b): (b.1) MATLAB/Simulink simulation of the BCD current source, and (b.2) the related current responses with various PWM duty cycles. (c): (c.1) Saber simulation of the proposed SSBC current source, and (c.2) its current responses with various expected values. (d) Simulated responses of magnetic field in the damping channel of MRD (without MR fluid) related to the currents in (c.2) produced by SSBC current source. Note that there are overshoots in the current responses in (c.2) but they almost disappear in the magnetic induction curves in (d). All the simulated results are obtained based on the actual MRD as a load. The red and blue points in (a), (b.2), and (c.2) denote the time when the currents reach 95% (\({\tau }_{r}\)) and 63.2% (\({\tau }_{r}{\prime}\)) of the expected outputs, respectively. The red points in (d) denote the turning points. The green points in (a) mark the values on the 14 A curve which match those (red points) on the curves of 3, 6 and 9 A, correspondingly.