Various methods and systems are provided for a power supply system. In one example, a method and system includes a power distribution unit (PDU) configured to receive power from a main power source and an uninterruptible power supply (UPS). The UPS includes a timer and the UPS is configured to directly power an output alternating current (AC) load after the main power source in unavailable. The UPS is also configured to power an output high voltage direct current (HVDC) load after the main power source is unavailable for a time delay measured by the timer.

Various systems are provided for a power supply system. In one example, the system includes a power distribution unit configured to receive power from a main power source and an uninterruptible power supply (UPS), wherein the UPS is configured to directly power an output AC load, the UPS is further configured to power an output DC load after coupled through one or more transformers.

The present invention provides a system comprising PoE apparatus including midspans, switches and routers that can provide high powered PoE connections that enable the recovery of DC power in sufficient quantities that allow it to be converted to AC power by way of an inverter. The invention also provides a method for providing AC power, data and light to office workstations using a single PoE connection. The invention further comprises a common mode signaling system that operates independently of any TCP/IP signal transmitted through an Ethernet connection wherein said signaling system is adapted to communicate with and control PoE powered devices.

The present disclosure comprises an alternating current-to-direct current converter for converting a commercial power current; a direct current-to-direct current converter for converting a battery current; a common output end at which the output end of the alternating current-to-direct current converter and the output end of the direct current-to-direct current converter are connected through a link capacitor having a preset bus voltage; a first circuit breaking part for opening or closing the current path between the common output end and a load; a second circuit breaking part for opening or closing the current path between the commercial power and the alternating current-to-direct current converter; a third circuit breaking part for opening or closing the current path between the battery and the direct current-to-direct current converter; and a control unit.

An auxiliary power supply device in which an increase in the size of an entire system including both an auxiliary power supply circuit unit and a sub-power supply circuit unit is able to be curbed is provided. There is provided an auxiliary power supply device configured to be connected to a power supply device, the auxiliary power supply device including: an auxiliary power supply circuit unit configured to supply electric power to the power supply device in a case in which supply of electric power to the power supply device is shut off; and a sub-power supply circuit unit having an input side connected to the power supply device and an output side connected to a load and configured to supply an output voltage to other circuit units in accordance with electric power supplied from the power supply device.

A DC power feeding device includes a power feed line connected to a DC load, a first DC/DC converter provided between a solar battery and the power feed line, and a second DC/DC converter provided between a battery and the power feed line. A first controller controls the first DC/DC converter such that maximum power tracking control of the solar battery is performed in a normal state of a commercial AC power source. The first controller controls the first DC/DC converter such that the solar battery outputs a power smaller than a load power in a power failure. A second controller controls the second DC/DC converter such that the battery is charged in the normal state of the commercial AC power source. The second controller controls the second DC/DC converter such that DC voltage on the power feed line attains a reference voltage in the power failure.

A modular in vitro diagnostics (IVD) vessel mover system providing redundant power management includes a plurality of modules which are configured to provide storage to one or more IVD samples. Each module comprising a power failover switch which is configured to receive internal power from an internal primary power source and transmit backup power to one or more of the plurality of modules.

A method for selecting a power source for a load is provided. The method includes monitoring the primary power source, when the primary power source is providing power to the load, determining if a condition of the primary power source crosses a first threshold, when the condition crosses the first threshold, turning on a first power field effect transistor to couple a back-up power source to the load through a second power field effect transistor, when the primary power source is not providing power to the load, determining if a condition of the primary power source crosses a second threshold, and when the condition crosses the second threshold, switching off the first power field effect transistor to couple the primary power source to the load through a third power field effect transistor.

A system, module, and method for generating reliable, high quality power on demand and off-grid includes a photovoltaic array for delivering DC power; a generator having a size ranging from about 5 kW to about 30 kW, and comprising an engine powered by hydrocarbon gas filtered through a coalescing filter and comprising an extended lubrication system; an uninterruptible power supply (UPS) comprising a storage battery, the UPS being coupled to the photovoltaic array for receiving the DC power, and to the generator by a bi-directional inverter for receiving, transmitting, and qualifying DC or AC power; and an intelligent controller coupled to the UPS for controlling output of the DC or AC power to at least one air compressor capable of providing compressed air to one or more pneumatic devices.

The present invention provides an online interactive uninterruptible power supply and method for control thereof. The online interactive uninterruptible power supply includes: an automatic voltage regulator and a changeover switch which are sequentially connected between an AC input and an AC output; a rectifying circuit, an input of the rectifying circuit being connected to the AC input; a charger, an input of the charger being connected to an output of the rectifying circuit and an output of the charger being configured for connection to a rechargeable battery; a DC-DC converter, an input of the DC-DC converter being connected to the rechargeable battery; and a first inverter, an input of the first inverter being connected to an output of the DC-DC converter. The changeover switch is configured to controllably connect the AC output to one of the automatic voltage regulator and an output of the first inverter. The online interactive uninterruptible power supply of the present invention can realize battery-free AC startup.