Abstract: A power supply unit supplies power to a load, and the power supply unit includes a power factor corrector, a DC conversion module, and an isolated conversion module. The power factor corrector is plugged into a first main circuit board and converts an AC power into a DC power. The DC conversion module is plugged into the first main circuit board and converts the DC power into a main power. The isolated conversion module includes a bus capacitor, the bus capacitor is coupled to the DC conversion module through a first power copper bar, and coupled to the power factor corrector through a second power copper bar. The first power copper bar and the second power copper bar are arranged on a side opposite to the first main circuit board, and are arranged in parallel with the first main circuit board.

Abstract: An optical element driving mechanism includes a movable assembly, a fixed assembly, and a driving assembly. The movable assembly is configured to be connected to an optical element. The movable assembly is movable relative to the fixed assembly. The driving assembly is configured to drive the movable assembly to move relative to the fixed assembly in a range of motion. The optical element driving mechanism further includes a positioning assembly configured to position the movable assembly at a predetermined position relative to the fixed assembly when the driving assembly is not operating.

Abstract: A client-server-based communications system includes: a communications network; an audio user interface, coupled to the communications network, for receiving a user selection command; an interactive voice response (IVR) system, coupled to the communications network, for receiving the user selection command via the communications network and generating a flow request in response to the user selection command; a visual user interface, coupled to the communications network; and a synchronization system, coupled to the IVR system and the communications network, for generating flow control information to control the visual user interface and the IVR system in response to the flow request, thereby synchronizing audio contents played by the audio user interface and visual contents played by the visual user interface.