Abstract: A power distribution circuit of an uninterruptible power supply is provided, where a first port of the power distribution circuit of the uninterruptible power supply is electrically connected to a second port. A third port is electrically connected to the second port by using a compensation circuit. When an input voltage of the first port is less than a rated voltage of a load of the second port, an input voltage of the third port is input to the compensation circuit. The compensation circuit converts a direct current into an alternating current, so that the alternating current output by the compensation circuit and the input voltage of the first port jointly supply power to the load of the second port.

Abstract: Embodiments of this application provide a power conversion circuit. The power conversion circuit includes at least one first power conversion unit connected in series to a first phase line, at least one second power conversion unit connected in series to a second phase line, at least one third power conversion unit connected in series to a third phase line, a plurality of first start circuits connected in series to the first phase line, and a plurality of second start circuits connected in series to the second phase line. Each first start circuit includes a first relay and a first resistor that are connected in parallel, and first relays in all the first start circuits are sequentially closed after the power conversion circuit is powered on, to start the power conversion circuit. Each second start circuit includes a second relay and a second resistor that are connected in parallel.

Abstract: A power supply and distribution system for a data center. The power supply and distribution system for a data center includes a plurality of SST power supply systems. Each of the plurality of SST power supply systems includes a rectifier module that performs voltage reduction and rectification by using an SST and an energy storage apparatus connected to the rectifier module. The plurality of SST power supply systems are in a one-to-one correspondence with a plurality of cabinet units, and each of the plurality of cabinet units is configured to deploy an SST power supply system corresponding to the cabinet unit. The rectifier module in each of the plurality of SST power supply systems receives electric energy through a medium-voltage bus.

Abstract: A cooling capacity distribution unit includes a liquid-cooled circulating pump disposed in a cabinet, and a frequency converter that supplies power to the liquid-cooled circulating pump. The frequency converter includes an AC-DC module and a DC-AC module. The AC-DC module is configured to be connected to mains, and the DC-AC module is connected to the liquid-cooled circulating pump. The cooling capacity distribution unit further includes a power supply unit, where the power supply unit includes a backup battery disposed in the cabinet, and a DC-DC module connected to the backup battery. The DC-DC module is connected to the DC-AC module and is configured to supply power to the liquid-cooled circulating pump.

Abstract: A cooling system and a cooling method thereof. The system includes a first refrigeration device, a second refrigeration device, and a cold storage device. Both of the first refrigeration device and the cold storage device are configured to provide a first medium for an end device to supply cold to the end device, and the second refrigeration device is configured to provide a first medium for the cold storage device to perform cold charging on the cold storage device. A cooling side medium input port of the second refrigeration device is configured to receive a first medium output by the end device. A chilled side medium input port of the first refrigeration device is connected to a cooling side medium output port of the second refrigeration device and is configured to receive the first medium output from the cooling side medium output port of the second refrigeration device.

Abstract: An air conditioning device includes an alternating current (AC) bus, a direct current (DC) bus, a first AC/DC circuit, a first DC/AC circuit, and a backup power supply apparatus. The AC bus is connected to two power supplies through a switching circuit. The backup power supply apparatus is connected to the DC bus or the AC bus. The backup power supply apparatus provides electric energy for the DC bus or the AC bus when the two power supplies are switched or fail, so that the first air conditioning load is not powered off. The backup power supply apparatus may supply power to the load when the two power supplies are switched or fail.

Abstract: Embodiments of this application provide a power conversion circuit. The power conversion circuit includes at least one first power conversion unit connected in series to a first phase line, at least one second power conversion unit connected in series to a second phase line, at least one third power conversion unit connected in series to a third phase line, a plurality of first start circuits connected in series to the first phase line, and a plurality of second start circuits connected in series to the second phase line. Each first start circuit includes a first relay and a first resistor that are connected in parallel, and first relays in all the first start circuits are sequentially closed after the power conversion circuit is powered on, to start the power conversion circuit. Each second start circuit includes a second relay and a second resistor that are connected in parallel.

Abstract: An uninterruptible power supplying method and an uninterruptible power supply. The method includes switching an uninterruptible power supply to a bypass working mode from a main loop working mode, so as to provide mains power for a load through a bypass; determining the working mode of the uninterruptible power supply; and when the uninterruptible power supply is in the bypass working mode, adjusting a working frequency of at least one switch tube in a main loop of the uninterruptible power supply to a second frequency from a first frequency, where the second frequency is less than the first frequency, so as to reduce power loss when the uninterruptible power supply is in the bypass working mode.

Abstract: An uninterruptable power supply (UPS) and a direct current-direct current (DC-DC) converter. An input end of the DC-DC converter is connected to a BUS+, a BUS?, and an N wire, and a load in the DC-DC converter is connected to a switch tube through an inductor rather than being directly connected to the switch tube.

Abstract: An uninterruptible power supplying method and an uninterruptible power supply. The method includes switching an uninterruptible power supply to a bypass working mode from a main loop working mode, so as to provide mains power for a load through a bypass; determining the working mode of the uninterruptible power supply; and when the uninterruptible power supply is in the bypass working mode, adjusting a working frequency of at least one switch tube in a main loop of the uninterruptible power supply to a second frequency from a first frequency, where the second frequency is less than the first frequency, so as to reduce power loss when the uninterruptible power supply is in the bypass working mode.

Abstract: Disclosed is an uninterrupted power supply apparatus, comprising a rectifying unit outputs a positive half-cycle of voltage potential and a negative half-cycle of voltage potential; a backup battery outputs a backup voltage; a first boost unit receives the positive half-cycle of voltage potential or the backup voltage and outputs a first voltage; a second boost unit receives the negative half-cycle of voltage potential or the backup voltage and outputs a second voltage; a current shunt unit receives the first voltage and the second voltage and outputs an AC output voltage; a charge circuit, coupled to the rectifying unit, the backup battery, and the first and/or the second boost unit, for being capable of controlling the first and/or the second boost unit to either store a charging power or charge the backup battery by applying the stored charging power alternatively and successively.

Abstract: The present invention provides a UPS and a DC-DC converter. An input end of the DC-DC converter is connected to a BUS+, a BUS?, and an N wire. Therefore, an input voltage is relatively low, and devices with low voltage resistance may be selected as devices in the DC-DC converter. Moreover, a load in the DC-DC converter is connected to a switch tube through a inductor rather than be directly connected to the switch tube. Therefore, a high-frequency switch wave on the second switch tube may not affect the load. Accordingly, performance of the load and an anti-electromagnetic interference capability of a whole circuit may be improved. In addition, the DC-DC converter provided in present invention does not have a structure as complicated as that of a dual BUCK topology in the prior art. Therefore, the DC-DC converter, with respect to the dual BUCK topology, has less devices and lower costs.

Abstract: Disclosed is an uninterrupted power supply apparatus, comprising a rectifying unit outputs a positive half-cycle of voltage potential and a negative half-cycle of voltage potential; a backup battery outputs a backup voltage; a first boost unit receives the positive half-cycle of voltage potential or the backup voltage and outputs a first voltage; a second boost unit receives the negative half-cycle of voltage potential or the backup voltage and outputs a second voltage; a current shunt unit receives the first voltage and the second voltage and outputs an AC output voltage; a charge circuit, coupled to the rectifying unit, the backup battery, and the first and/or the second boost unit, for being capable of controlling the first and/or the second boost unit to either store a charging power or charge the backup battery by applying the stored charging power alternatively and successively.