A portable fan having a power supply, a motor coupled to a plurality of fan blades and powered by the power supply, and a battery pack coupled to the portable fan and configured to provide power to the power supply. The portable fan further includes a controller configured to receive power from the power supply. The controller is configured to receive an input to control the motor at a requested speed, operate the motor at the requested speed, and initiate a ramp-down operation, wherein the ramp-down operation is configured to ramp down the speed of the motor from the requested speed over a period of time.

Provided is a storage apparatus in which of power stored by a battery, surplus power can be effectively used for a monitoring device in normal operation. A storage apparatus includes a power assist controller that monitors the load of a monitoring device selected as a power assist target device. The power assist controller has: a monitoring unit that monitors the load of the monitoring device; and an assist unit that assists the monitoring device by supplying surplus power to the monitoring device until the load becomes a load threshold value or less when the surplus power remains in a battery and the load exceeds the load threshold value.

A process for transiently increasing performance of an electric motor includes boosting a DC link voltage of a rectifier-fed variable frequency drive of the electric motor by using an energy storage system. The energy storage system delivers power directly to a DC link of the variable frequency drive. The energy storage system can be at least one of a battery bank, capacitor bank and a flywheel. Feedback from the DC link is delivered to a DC link controller.

A device and method for actively pre-charging an inverter capacitor includes a switched bypass pre-charging path having one or more power switches for selectively connecting and disconnecting the battery and the inverter capacitor in response to one or more first switching control signals having a configurable duty cycle, where one or more processor units are configured with a predictive active pre-charging module to control active pre-charging of the inverter capacitor from the battery by using low-frequency measurements of a battery voltage and an inverter capacitor voltage to periodically determine the configurable duty cycle for the one or more first switching control signals that is applied over a plurality of specified charging intervals to actively pre-charge the inverter capacitor to the battery voltage.

A battery pack control method includes: detecting real-time load power of a multi-battery pack system; and when the real-time load power is less than a first power threshold, and at least two battery packs discharge in parallel, determining a target battery pack from the battery packs discharging in parallel, maintaining a discharge function of the target battery pack, and disabling a discharge function of another battery pack discharging in parallel other than the target battery pack.

The present disclosure relates to a redundant power device, and an object of the present disclosure is to provide a redundant power topology that can ensure normal operation of a battery management system (BMS) by securing normal operating power of the BMS even when a disconnection occurs in a cable connecting a battery cell and the BMS or an abnormality or failure occurs in an uppermost battery cell. The present disclosure provides a configuration of switching a power supply cable to a processor so that power is supplied to the processor through a sub-cable when an abnormality occurs in a main cable.

A method for extending the storage lifetime of a rechargeable battery located in a device is disclosed. The battery lifetime extension method includes providing a device that derives its power from a rechargeable battery. When the device is powered off by a user, a computer implemented program utilized by the device automatically powers up the device into a lower power mode upon expiration of a variable duration timer monitored by the computing unit that continuously repeats according to a programed duration cycle. The computer implemented program then evaluates a state of charge of the rechargeable battery, determines whether the state of charge of the rechargeable battery is above or below a variable programed threshold, and causes the rechargeable battery to remain in a low power state until a charge is applied to the rechargeable battery.

The present disclosure provides an on-board charger and inverter system (100, 200, 300) for a vehicle. The system comprises a unified charger cum traction inverter (UCCTI) configured for bidirectional conversion between alternating current and direct current, a rechargeable battery coupled to the UCCTI (1, 9, 16), and a dual three-phase permanent magnet synchronous motor (PMSM) (3, 11, 18) having a first three-phase terminal set (3a) coupled to the UCCTI (1, 9, 16) and a second three-phase terminal set (3b) selectively connectable to an external alternating current source (5, 13, 20). A controller (4, 12, 19) configures the dual three-phase PMSM (3, 11, 18) to operate as a transformer during charging or as a propulsion motor during traction. The UCCTI (1, 9, 16) operates in a first charging mode using three-phase alternating current, a second charging mode using single-phase alternating current, a third traction mode supplying three-phase alternating current to the PMSM (3, 11, 18), and a fourth traction mode supplying single-phase alternating current to the PMSM (3, 11, 18), thereby enabling integrated charging and propulsion functions.

The electrical energy storage module (M1-In) comprises a plurality of elementary storage cells (C1 to C12). According to the invention, the module comprises at least one cell unit (U1-1,U1-2) including a plurality of elementary storage cells connected in series (C1 to C6; C7 to C12) and integrated power-switching means (P1, S1; P2, S2) dedicated to this cell unit, delivering, between two power output terminals (B1, B2) of the cell unit, a positive DC voltage, a negative DC voltage, a zero voltage or a high impedance state, depending on a command received by the cell unit.

A cordless aw is provided with regenerative braking means that increases the number of repeated cuttings the saw is able to perform (x) per full discharge cycle of the battery pack, as compared to the number of repeated cuttings achievable by the same saw not employing a regenerative braking means (y) per full discharge cycle of the battery pack, such that x/y is approximately at least one of the following: i) 1.1 when cutting a Pressure-Treated (PT) lumber workpiece having a cross-sectional size of approximately 89 mm89 mm2 mm, ii) 1.15 when cutting a Spruce Pine Fir (SPF) lumber workpiece having a cross-sectional size of approximately 38 mm89 mm2 mm, or iii) 1.25 when cutting Medium Density Fiberboard (MDF) workpiece having a thickness of approximately 19 mm1 mm and a width of approximately 76 mm2 mm.