The advantages of active capacitor converters include: improving system power density, achieving fast dynamic response, effectively decoupling power, and efficiently utilizing energy. The pulsed load characteristics usually show strong pulse characteristics, mainly periodic and transient peak values, which have a serious impact on the pulsed power source. Therefore, it is crucial to research stable and sustainable power supply for pulse power sources. Using only the output capacitor of a DC-DC converter to supply energy to pulse loads results in an increase in the output capacitor size, leading to larger device volume and adversely affecting the improvement of system power density. To address this, this paper proposes an active capacitor converter approach that decouples pulse energy onto the storage capacitor of a bidirectional converter, effectively reducing the capacitance value and improving system power density. For the bidirectional Buck/Boost converter, predictive current control is adopted. Compared to traditional PI control strategies, predictive current control can reduce lag effects, improve response speed, simplify parameter optimization, and enhance the dynamic performance of the bidirectional converter. Simulation and experimental results validate that the use of active capacitor converters can quickly respond to power changes and maintain bus voltage stability during pulses. The approach shows significant advantages in terms of rapid response and efficient energy transfer.