An embodiment relates to an arrangement for equalizing voltage drops in a power supply mains having a first mains supply and a second mains supply. The arrangement includes at least one first converter system and one second converter system, to which intermediate circuits are coupled and which form a mains coupling as a result. The first mains supply is connected to a distributor via a decoupling inductor, a voltage measurement and a first switch. The second mains supply is connected to the distributor via a second switch, and wherein the mains coupling is arranged parallel to the second switch.

A dual power supply apparatus includes a main power grid that supplies power by a first battery to an autonomous vehicle and a redundant power grid that supplies power to a dual power load based on a second battery, in an emergency driving mode due to a failure in the main power grid.

A system includes a transformer rectifier unit (TRU) having three inputs, a first AC bus configured to supply power to a first of the three inputs, a second AC bus configured to supply power to a second of the three inputs, and a third AC bus configured to supply power to a third of the three inputs. The system includes a power quality sense device electrically connected to each of the first, second and third AC busses. The system includes an electrically held contactor electrically connected between the TRU and the power quality sense device. The electrically held contactor is configured and adapted to be switched ON or OFF depending on whether the power quality sense device is energized or de-energized.

The application discloses an automatic transfer switch and a power supply system. The automatic transfer switch includes: a first switch unit having a first end connected to a first device through a converter port, and a second end electrically connected to a power grid through a power grid port; a second switch unit having a first end connected to a second device through an electric vehicle port and a charging/discharging circuit unit, and a second end electrically connected to the second end of the first switch unit; a third switch unit, having a first end electrically connected to the power grid through the power grid port, and a second end electrically connected to a load through a load port; a sampling unit; and a control unit connected to the sampling unit.

The present disclosure provides an electrical system that includes an energy control system, a photovoltaic (PV) power generation system electrically coupled to the energy control system, an energy storage system electrically coupled to the energy control system, and a smart load panel electrically coupled to the energy control system and to a plurality of backup loads. The energy control system operates in an on-grid mode electrically connecting the PV power generation system to a utility grid and a backup mode electrically disconnecting the PV power generation system from the utility grid. The smart load panel selectively disconnects one or more of the plurality of backup loads from the energy control system when the energy control system is in the on-grid mode and when the energy control system is in the backup mode.

A computer-readable recording medium storing a control program for causing a computer to execute a process, the process includes detecting, at predetermined time intervals, an average value of power detected from each breaker of breaker groups in a plurality of hierarchical levels to which power is supplied from a plurality of power supplies, and causing, in a case where there is a breaker of which the average value has an increase by a predetermined ratio or more in a certain hierarchical level and an upper hierarchical level of the certain hierarchical level among the plurality of hierarchical levels, one power supply among the plurality of power supplies to output power obtained by adding the increase in the breaker in the upper hierarchical level.

Aspects of the disclosure include a power system comprising a power-supply device having an output, the power-supply device being configured to provide output power to the output of the power-supply device, and control circuitry configured to receive voltage information indicative of a voltage of a battery, determine that the voltage of the battery is above a first voltage threshold, activate a shutdown signal responsive to determining that the voltage of the battery is above the first voltage threshold, determine that the voltage of the battery is below a second voltage threshold, the second voltage threshold being less than the first voltage threshold, control the power-supply device to disable the output power to the output of the power-supply device responsive to determining that the voltage of the battery is below the second voltage threshold and that the shutdown signal is activated, and control the power-supply device to provide the output power to the output of the power-supply device responsive to determining that the voltage of the battery is below the second voltage threshold and that the shutdown signal is not activated.

An automatic isolation switch (AIS) system is provided for controlling a supply of electrical power to a load. The system includes a switch and a controller. The switch is connected between a first power system and the load and between the first power system and a second power system. The first power system includes a grid, and the second power system includes a power source and an inverter coupled to the power source. The controller is configured to detect an adverse power condition on the first power system for supplying electrical power to the load; to isolate, via at least one switch, the first power system from the load and the second power system, in response to the detecting of the adverse power condition; and to activate the inverter of the second power system to supply electrical power from the second power system to the load.

An apparatus for defining an AC power source having a predetermined amperage rating and for use with a pallet truck or fork lift lifting device. The apparatus includes a pair of terminal banks, a battery, a converter adapted to change DC to AC power, a relay, a controller, and a base adapted for engagement by the lifting device for transport of the apparatus. The apparatus is shaped so that it can be transported by the lifting device through a doorway. A pair of terminal banks, battery, converter, relay and controller are coupled to one another and configured for selective operation in a standalone configuration or a stacked configuration.

A stacked power supply system applied for an electronic device is provided. The stacked power supply system has an adapter and multiple battery modules. The adapter has a power plug, a power supply connector and a battery connector. The adapter is connected to an external AC power via the power plug, and converts the alternating current to the direct current, so as to supply power to the electronic device via the power supply connector. The battery modules have a battery set, a first connector and a second connector. The first connector of one of the battery modules is electrically connected to the battery connector of the adapter, the second connector of other neighboring battery modules is adapted to the first connectors of the neighboring battery modules, so as to form a stacked battery modules structure.