A power supply system for a battery system of a vehicle is provided. The power supply system includes: a switch control unit configured to control a power switch to switch an external load; an electronic unit; a first power supply electrically connected to the switch control unit and electrically connected to the electronic unit; a second power supply; and a switching unit. In a normal mode, the first power supply electrically supplies the electronic unit. The switching unit is configured to, in a cold crank mode: electrically disconnect the first power supply from the electronic unit when a voltage of the first power supply drops below a threshold voltage; and electrically connect the second power supply to the electronic unit when the voltage of the first power supply drops below the threshold voltage such that the second power supply powers the electronic unit in the cold crank mode.

A carriers synchronizing method of a hybrid frequency parallel inverter is proposed. A low-frequency ripple simulating step is performed to drive a high-frequency controlling unit to simulate a low-frequency ripple. An equidistant grid sampling step is performed to drive the high-frequency controlling unit to sample a sample ripple to generate a sample group and sample the low-frequency ripple to generate a plurality of low-frequency reference groups. An actual shifting angle searching step is performed to drive the high-frequency controlling unit to compare the sample group with the low-frequency reference groups to search an actual shifting angle from the reference shifting angles. A high-frequency carrier adjusting step is performed to drive a proportional integral controller to calculate the actual shifting angle to generate a sync reference, and then a period counter adjusts a starting point of the high-frequency carrier according to the sync reference.

An automatic transfer switch (100) for automatically switching an electrical load between two power sources is provided. Two power cords (106) enter the ATS (A power and B power inputs) and one cord (109) exits the ATS (power out to the load). The ATS has indicators (107) located beneath a clear crenelated plastic lens (108) that also acts as the air inlets. The ATS (100) also has a communication portal (103) and a small push-button (104) used for inputting some local control commands directly to the ATS (100). The ATS (100) can be mounted on a DIN rail at a rack and avoids occupying rack shelves.

A medium voltage grid-connected photovoltaic inverter system and a photovoltaic power generation system including the same are provided. The medium voltage grid-connected photovoltaic inverter system includes a photovoltaic inverter, a medium voltage transformer, a switchgear, and an inverter grid-connected controller. A low voltage side of the medium voltage transformer is connected to an alternating current output terminal of the photovoltaic inverter. An input terminal of the switchgear is connected to a high voltage side of the medium voltage transformer, and each phase of the switchgear includes two output terminals each for being connected to another switchgear. The inverter grid-connected controller is connected to a controlled terminal of the switchgear, and is configured to control the switchgear to switch off/on, so that the medium voltage grid-connected photovoltaic inverter system is disconnected from or connected to a grid.

A system includes: a ring bus; a plurality of static uninterruptible power supplies (UPSs), each static UPS of the plurality of static UPSs including: at least one battery; an input that is electrically connected to a first external electrical power source; and an output that is electrically connected to a load, and, via a first corresponding choke, to the ring bus; at least one fuel-cell interface converter (FIC) that converts direct current (DC) electrical power to alternating current (AC) electrical power, each FIC of the at least one FIC being electrically connected to the ring bus via a second corresponding choke; and a fuel cell module corresponding to and electrically connected to each FIC, the fuel cell module including a fuel cell.

An adaptive solar power battery storage system is disclosed to capture alternative energy for use when desired, regardless of power generating circuit topology (AC or DC). The adaptive solar power battery storage system may be connected directly to solar panel cells (for DC-type solar panels) or to micro-inverters (for AC-type solar panels). The adaptive battery storage system can be configured to accept power from both energy sources simultaneously (AC or DC), or each individually. The adaptive solar power battery storage system may enable the operation of AC-type solar panels in the absence of utility power, which is ordinarily used to supply a reference signal to the micro-inverters, by converting stored DC battery power to AC to generate an emulated reference signal. The system may monitor the utility power and adjust the emulated reference signal to track the utility power to enable a safe transfer back to utility power once restored.

An input redundant power supply circuit includes a power converter, a relay switch unit including a first relay circuit coupled to a first power source and a second relay circuit coupled to a second power source, a control unit configured to control the relay switch unit so that the power converter is supplied power by the first or second power source, a high capacity capacitor powered by the power converter and a step-up converter coupled between the power converter and the high capacity capacitor. The step-up converter maintains a voltage across the high capacity capacitor higher than a voltage of the first power source or a voltage of the second power source when the relay switch unit switches from one of the first power source and the second power source to the other of the first power source and the second power source.

A device and method for switching between a first power source and a second power source. The device includes a first terminal, a second terminal, and a third terminal that connect to the first power source, a load, and the second power source respectively. A first switch and a breaker circuitry connect the first terminal to the second terminal. A second switch interrupts an electrical connection between the third terminal and the second terminal. A lever operably coupled to the first switch and the second switch, the lever can be actuated by the first switch to flip the second switch between the open state and the closed state.

A control device includes an electric motor, a battery, a capacitor, a power source selection portion, a determination unit configured to determine whether the battery is normal, and a control unit configured to select, as a control mode of the electric motor, one of a first mode and a second mode in which a power consumption amount of the electric motor is reduced as compared to when the electric motor is driven in the first mode, and drive the electric motor in the selected control mode. When the battery is transitioned from a state of being determined to be normal to a state of being determined to be not normal, the control unit switches the control mode from the first mode to the second mode and then makes the power source selection portion select the capacitor.

The application relates to an energy storage including a plurality of energy modules arranged in one or more energy module strings. A string controller is configured for controlling a current path through the energy module strings by controlling the status of a plurality of semiconductor switches. A first end of a current path is electrically connectable to a first electric system of a first electric bus via a first bus switch and to a second electric system of a second electric bus via a second bus switch. A second end of the current path is electrically connectable to a first reference potential being the same as the reference potential of the electric systems connected to the first end of the current path. An energy storage controller is configured for controlling the status of the first bus switch and of the second bus switch in dependency of the received power status.