Measurements with different types of cables confirm that well-coupled pairs have better suppression of the resonance process and lower voltage spikes due to the corresponding hot-insertion process. The resonance formed by the LC circuit can be suppressed by connecting an RC circuit in parallel with the input capacitor. The parameters of the RC circuit can be calculated by the following method. The calculation formula of RS is as follows: where LP is the inductance of the cable, and CIN is the input capacitance of the system. , ξ is the desired suppression coefficient. In the aforementioned hot-insertion case, LP is about 1.5µH and CIN is 9µF at 12V. When we choose a good suppression effect (ξ = 1), RS = 0.2Ω. The value of the suppression capacitor CS must be large enough to prevent it from being overcharged during the occurrence of current pulses caused by hot insertion, with a voltage increment VC = IC * 1/ωC, where ω is the resonant frequency of LP and CIN (measured data approx. is 40kHz). Since the amplitude of the current pulse is 35A, to make the voltage increase due to charging less than 2V, we need a capacitor value greater than 70µF.