A bidirectional chopper selectively performs: a charging operation to store DC power received from a DC bus in a power storage device; and a discharging operation to output DC power of the power storage device to the DC bus. An inverter converts the DC power received from the DC bus into AC power and supplies the AC power to a load, and converts regenerative power generated by the load into DC power and outputs the DC power to the DC bus. An SOC reference value is set for the power storage device, the SOC reference value being smaller than an upper limit value of a usable range of the SOC and larger than a lower limit value of the usable range. When an AC power supply is sound, a control device controls the bidirectional chopper such that the SOC of the power storage device reaches the SOC reference value.

A jobsite audio device with multi-source power and multi-port USB interface is proposed, which includes an AC-DC power source, a battery pack, a multi-port USB interface including at least one bidirectional power delivery USB C port, a charging circuit coupled to the AC-DC power source, the battery pack and the multi-port USB interface to provide power delivery paths, an audio module powered by the AC-DC power source or the battery pack to generate audio signals, and a main controller coupled to the charging circuit and the audio module, wherein the main controller monitors power consumption of the audio module and charging process of the charging circuit to automatically adjust charging power.

A processor of a battery apparatus estimates an internal resistance of a battery at a reference temperature based on a measured voltage of the battery, a measured current of the battery, an open circuit voltage of the battery, and a measured temperature of the battery, and estimates a resistance state of the battery based on the estimated internal resistance and a beginning of life (BOL) resistance at the reference temperature when the battery is in a BOL state.

A power conversion circuit is coupled to a motor and a wireless charging transmitter device. Power conversion circuit includes an inverter and a processor. Inverter includes three half-bridge circuits. Three half-bridge circuits are respectively coupled to a battery, motor and wireless charging transmitter device. Each of three half-bridge circuits includes two switches. Processor is coupled to switches of three half-bridge circuits and generates a plurality of control signals at a first stage to respectively control switches according to a first level of each of control signals, so that battery supplies power to motor. Processor adjusts first level of each of control signals to a second level during a second stage to turn off one of three half-bridge and to turn on switches of the other two of three half-bridge alternately so as to adjust a power supply of wireless charging transmitter device to charge battery to a target power.

A distributed energy storage unit (DES) is disclosed. The DES unit includes a combined input/output terminal configured to be coupled to an external circuit, power conversion circuitry operably coupled to the combined input/output terminal, an energy storage device operably coupled to the power conversion circuitry, and a controller. The DES unit is configured to operate the power conversion circuitry to provide charging power, derived from the input power, to the energy storage device, identify whether the external circuit is not receiving input power, and operate, in response to the external circuit not receiving the input power, the power conversion circuitry to provide backup power, derived from energy stored on the energy storage device, to the combined input/output terminal. Non-transitory computer readable medium for operating the DES unit and methods of providing output power from a DES unit are also disclosed.

An external battery includes a battery cell, a charging unit configured to generate a charging current with an external power supplied from a charger to an input terminal thereof and transfer the charging current to the battery cell, a main controller unit (MCU) configured to control charging of the battery cell by the charging current, and a switch unit between the charging unit and the battery cell, wherein, when the switch unit is in an on state, the MCU changes to an active mode and allows the charging current to be transferred to the battery cell, and when the switch unit is in an off state, entering by the MCU a sleep mode and cutting off the charging current transferred to the battery cell.

Devices, systems, methods, and processes for dynamically controlling power supplied from power supply units (PSUs) and battery units of network devices are described herein. Generally, network devices rely on redundant power supplies or large hold-up capacitors to address power supply issues. Redundant power supplies lead to sub-optimal efficiency, while hold-up capacitors lead to bulky network device taking up space within the PSUs. Therefore, the present disclosure describes disposing one or more battery units in linecard slots or PSU slots. The battery unit may provide redundancy for the power supply and can act as an effective filter for power signal fluctuations. The battery units and the PSUs are dynamically controlled based on a load demand associated with the network device and power supply sources connected to the network device. Thus, the battery unit actively participates in load sharing with the PSUs to operate the PSUs more efficiently.

The present invention relates to a wind turbine comprising an internal power supply grid for distributing power to a number of power consuming units of the wind turbine, the wind turbine further comprising a power backup system connected to the internal power supply grid for supplying power to said internal power supply grid during a grid fault, wherein the power backup system comprises a controllable power storage module providing a total backup voltage that falls within a nominal voltage range of the internal power supply grid of the wind turbine. The present invention also relates to a power backup system and an associated method.

Energy storage systems for charging an electronic device and methods of operating the same are disclosed. The energy storage system includes an AC bus, a DC bus, a plurality of batteries, a plurality of breakers, a plurality of inverters, and a controller operatively coupled with the batteries and the breakers. The method includes calculating, by the controller, an amount of power necessary to charge the electronic device; operating, by the controller, the breakers such that the batteries of a discharging station is configured to discharge through a charging station; and charging the electronic device using the batteries.

Systems and methods for simultaneously generating a charging signal and a power signal via a converter having a first leg, a second leg, a third leg, and a fourth leg are disclosed herein. An alternating current (AC) source input voltage having a fundamental frequency of a power system is received. The charging signal is generated by the first leg and the second leg and the power signal is generated by the second leg, the third leg, and the fourth leg. The second leg is switched at the fundamental frequency and the first leg, the third leg, and the fourth leg are switched at frequencies higher than the fundamental frequency.