Abstract: A power supply unit includes a shell receiving a power supply with a socket, a rotating member, and a resilient hook. A first end of the rotating member is rotatably connected to a first side of the shell, the hook is mounted to a second side of the shell opposite to the rotating member, and a second end of the rotating member opposite to the first end is detachably latched to the hook. The rotating member further includes an abutting plate adjacent to the socket. A plug is plugged into the socket. The rotating member is rotated toward the shell, until the hook latches with the rotating member. The plug abuts the abutting plate.

Abstract: A power supply device for supplying power to electronic device. The power supply device includes a power supply module and a microchip. The power supply module includes a plurality of Power Supply Units (PSUs) connected to a power source. The microchip is connected to each PSU. The microchip is capable of determining the number of PSUs actually supplying power to the electronic device, and activating a protection circuit only in relation to the PSUs actually supplying power to the electronic device.