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1. A power supply device, comprising;
a first power conversion unit comprising a first interface and a second interface, the first interface configured to connect to an external alternating current (AC) power source to receive AC power from the external AC power source, the first power conversion unit converting the received AC power into a first direct current (DC) power and outputting the first DC power via the second interface; and a second power conversion unit detachably connected to the first power conversion unit comprising a third interface and a fourth interface, the third interface configured to connect to the second interface, the second power conversion unit converting the first DC power into at least one second DC power and outputting the at least one second DC power via the fourth interface to power external electrical devices using the at least one second DC power; wherein when the third interface is connected to the second interface, the first power conversion unit and the second power conversion unit are electrically connected with each other; when third interface is disconnected from the second interface, the first power conversion unit and the second power conversion unit are detached from each other.
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