Abstract: Electronic device is provided. The electronic device includes a host system; at least two input/output modules configured to realize input and/or output functions of the electronic device; a connection device, for connecting the host system and the at least two input/output modules to enable the at least two input/output modules to perform a same type and/or different types of motion relative to the host system, so that the electronic device has different device forms; and the at least two input/output modules having a same posture or different postures relative to the host system when the electronic device is in different device forms.

Abstract: The present invention discloses a high step-down modular DC power supply, belonging to the field of power electronics technology, and the high step-down modular DC power supply includes an upper modular cascade circuit string, a lower modular cascade circuit string, a load, and an input source, where the upper modular cascade circuit string includes i upper sub-module circuits, and the lower modular cascade circuit string includes j lower sub-module circuits. A combination manner of module circuits includes: upper module string cascading, lower module string cascading, and hybrid cascading of the upper module string and the lower module string. The power supply is formed to be a high voltage step-down ratio power supply with high voltage direct current input and low voltage direct current output through modular cascading.