A working method of a modular uninterruptible power supply (UPS) includes: obtaining working parameters of the modular UPS, where the working parameters include an input voltage parameter, a load parameter, and a battery parameter; and adjusting a working mode of a power module in the modular UPS according to at least one of the working parameters of the modular UPS, so that not all power modules are in a same working mode, where the modular UPS includes K working modules, and 2≤K.

A circuit includes an emergency lighting system and an AC/DC converter. An output terminal of the emergency lighting system is electrically connected to a LED load, and the other output terminal DIM of the emergency lighting system is electrically connected to a switch S2. The switch S2 is controlled by the emergency lighting system. The emergency lighting system includes an AC input detection module, a switching time detection module and a lithium battery. The AC input detection module is electrically connected to a neutral wire VN and a live wire VL. The switching time detection module is electrically connected between an output terminal of the AC input detection module and the terminal DIM. An output terminal of the AC/DC converter is electrically connected to a positive electrode of the lithium battery, and the other output terminal of the AC/DC converter is electrically connected to the LED load.

Power management circuitry initiates storage of backup energy in an energy storage resource. The backup energy is stored to power an electronic circuitry during a power failure condition in which primary power is unavailable to power the electronic circuit. During a test mode, the power management circuitry selectively discharges the backup energy stored in the energy storage resource at multiple different energy discharge rates to test the energy storage resource.

A system for controlling power utilization from hybrid energy sources to reduce energy consumption costs and maximize use of renewable energy; the system comprises a plurality of switches for switching power between a plurality of power sources; a control unit for controlling the switches to switch between the power sources to supply power from at least one of said power sources to said loads; the control unit preventing back-feeding of power between the power sources; the control unit reducing excess power generated from multiple inverters equally or storing it in a battery bank; the control unit diverting the excess power to the battery bank in the event that loading of at least one of said power sources falls below a predetermined value.

A first battery pack includes a first battery module and a first controller. A second battery pack includes a second battery module and a second controller. The first battery pack and the second battery pack are installed to be freely attachable and detachable in relation to a main body. An activation manager performs an activation instruction such that the first controller and the second controller do not activate at a same timing. The first controller which activates earlier operates in an ordinary mode in which power is supplied from the first battery module to an AC load. The second controller which activates later operates in a standby mode in which power is not supplied from the second battery module to the AC load.

A method of adding a power feed to electrical systems includes coupling a set of input lines to a power source such that the input lines are connected to at least one phase of AC power from the power source, and coupling a set of backfeed lines to an output receptacle in a power distribution unit. The output receptacle may be connected in parallel with at least one other output receptacle that is supplying primary power to systems in the data center. The set of backfeed lines and the set of input lines may be tested to determine a match between a pair of lines in the set of backfeed lines and a pair of lines in the set of input lines. Determining the match may include matching the phase of the pair of backfeed lines with the phase of the pair of input lines.

A method of adding a power feed to electrical systems includes coupling a set of input lines to a power source such that the input lines are connected to at least one phase of AC power from the power source, and coupling a set of backfeed lines to an output receptacle in a power distribution unit. The output receptacle may be connected in parallel with at least one other output receptacle that is supplying primary power to systems in the data center. The set of backfeed lines and the set of input lines may be tested to determine a match between a pair of lines in the set of backfeed lines and a pair of lines in the set of input lines. Determining the match may include matching the phase of the pair of backfeed lines with the phase of the pair of input lines.

A system is provided. The system includes a ring bus, at least one voltage source, and a plurality of uninterruptible power supplies (UPSs) electrically coupled between the at least one voltage source and the ring bus, wherein at least one UPS of the plurality of UPSs includes an input, an output, a rectifier having a rectifier input and a rectifier output, an inverter having an inverter input and an inverter output, wherein the rectifier output is electrically coupled to the inverter input, and a bypass switch electrically coupled between the rectifier input and the inverter output, the bypass switch configured to close in response to detection of a fault on the ring bus.

A micro controller unit (MCU) includes a flash memory, wherein the flash memory determines a key value of an application when the MCU is powered on, and, when the key value of the application is invalid, the flash memory enters a mode that enables reprogramming of the flash memory.

A system and method for supplying uninterruptible power has active power negotiation and an extended range. The system includes a housing, a power supply input, a power source equipment input, a powered device output, an alternative power supply, and a control module. The control module includes a comparator, a switch, a converter, and an injector. The injector includes a regulator and power autonegotiation module. The injector actively manages the power to the powered device, even when the PoE available from older power source equipment differs from the PoE requirements of an updated powered device. There can also be an Ethernet switch as a power source equipment extension between the powered device and the system. The Ethernet switch extends the range of the powered device from the system.