The IPOSIPOS DAB dc-dc converter system is a promising candidate for realizing the high output voltage with the low-voltage DAB module. However, the existing schemes cannot realize the fast-dynamic control performance and the flexible power sharing controlPower sharing control scheme for the IPOS DAB dc-dc converter. Therefore, a tunable power sharing controlPower sharing control scheme with fast dynamic responseDynamic response is proposed for the IPOS DAB dc-dc converter system in this chapter. Besides, a variant of this proposed scheme is employed to realize the black-startBlack-start control operation for the synchronously charging operation of each output capacitor. Moreover, the hot-swap operationHot-swap operation is further studied for ensuring the uninterrupted power supply. In addition, the ISOPISOP DAB dc-dc converter can transfer the power from the high dc voltage terminal to the low-voltage load. However, the existing schemes cannot realize the complete decoupling between the regulation of the input voltages and the adjustment of the output voltage. Thus, an input-oriented power sharing controlPower sharing control scheme with fast dynamic responseDynamic response is proposed for the ISOP DAB dc-dc converter system in this Chapter. Furthermore, an inductance estimating scheme is proposed for ensuring the desired power sharing performance of the ISOPISOP DAB dc-dc converter system.