A combined power supply device and a power supply system having a modular power supply device

A combined power supply unit, for installation on a main carrier plate, the modular power supply device includes a first substrate, a driving module and a switching module; the first substrate and having a first axis substantially perpendicular to a the second direction of the first axial direction, the first substrate inserted in the main carrier plate, and the second axis is substantially perpendicular to the main carrier; driving module located in the side of the first substrate Bing electrically connecting the first substrate; the converter module on the other side of the first substrate, Bing electrically connected to the driving module, wherein the length of the conversion module is substantially equal to the length of the first axial direction of the first substrate, the conversion module width smaller than the first axial length of the first substrate.