Abstract: A lower-cost power distribution apparatus (PDU) using a lesser number of components that connects with many power supply units. The PDU comprises first and second switching modules, for outputting AC from a first or a second power source. The first switching module and the second switching module automatically switch between opposite states (turned on or turned off) based on the AC power source. At a given instant, the first switching module and the second switching module are in opposite states.

Abstract: A lower-cost power distribution apparatus (PDU) using a lesser number of components that connects with many power supply units. The PDU comprises first and second switching modules, for outputting AC from a first or a second power source. The first switching module and the second switching module automatically switch between opposite states (turned on or turned off) based on the AC power source. At a given instant, the first switching module and the second switching module are in opposite states.

Abstract: A system for monitoring power usage includes a power distribution unit (PDU) and a monitoring device. The PDU includes a detecting module and a storing module, the monitoring device includes an amplifying module and a processing module. The detecting module obtains signal as to voltage and current relating to a power supply, and the storing module stores data as to calibration. The amplifying module obtains the signal as to voltage and current, and amplifies the same. The processing module obtains the amplified signal and processes the amplified to obtain data as to electrical flow. The processing module can obtain calibration data from the storing module, and apply corrections according to the calibration data.

Abstract: An uninterruptible power supply (UPS) includes an alternating current (AC) power interface connected to an AC power source, a rectifier converting an AC voltage received from the AC power supply to a rectified direct current (DC) voltage, a converter converting the rectified DC voltage to a working DC voltage according to voltage requirement of the PSU of the electronic device, a charge and discharge circuit connected to the converter, a battery charged by the charge and discharge circuit, and a power distribution unit (PDU) to output the working DC voltage to the PSU. When the AC power source is down, the battery supplies power to the PDU through the charge and discharging circuit. The PDU further outputs the power from the battery to the PSU.

Abstract: An uninterruptible power supply (UPS) includes a rectifier, a converter, a first auxiliary power source, and a power distribution unit (PDU). The rectifier receives an alternating current (AC) voltage from an AC power source and converts this to a rectified direct current (DC) voltage which is outputted to the converter. The converter converts the rectified DC voltage to a working voltage and outputs the working voltage to a power supply unit (PSU) through the PDU. The first auxiliary power source outputs a DC voltage to the PSU through the PDU when the AC power source is down.

Abstract: A connector assembly includes a jack formed on a circuit board and a plug engaging with the jack. The jack includes a main hole and at least one fool-proof hole extending from a periphery of the main hole. The plug includes a main connecting part corresponding to the main hole and at least one fool-proof part extending from a periphery of the main connecting part. When the plug is inserted into the jack, the main connecting part is tightly received in the main hole, and the at least one fool-proof part is tightly received in the at least one fool-proof hole.