Abstract: Systems and methods for management of a backup power system are described herein. At least one illustrative embodiment includes a backup power system configured to couple to a power source including a plurality of batteries, each comprising one or more cells, used to provide power if the power source fails, and processing logic coupled to the batteries and configured to monitor the state of each of the plurality of batteries and control the charging and discharging of each of the plurality of batteries. If the power source has not failed, the processing logic repeatedly and sequentially causes each battery to discharge while at least one of the remaining batteries remains fully charged, and monitors the power provided by the discharging battery. The processing logic determines the available energy stored in each fully charged battery based upon the power provided by the discharging battery during the time it takes to discharge.

Abstract: In an uninterruptible power supply apparatus, a common mode current flowing from nodes (N1 to N3) to a line of a ground voltage (GND) through a stray capacitance (41) of a battery (40) is limited by a common mode reactor (34), and the low-level common mode current passing through the common mode reactor (34) is caused to flow to a virtual neutral line (NL) through a common mode capacitor (37). Therefore, the level of noise caused by the common mode current can be reduced.

Abstract: The present invention relates, in general, to a charge equalization apparatus with series-connected battery cells and, more particularly, to a charge equalization apparatus, in which series-connected battery cells (B1 to BN) are connected in parallel with the primary windings (Mi 1 to M1N) of transformers (T1 to TN), switches (S1 to SN) for controlling the flow of current of the primary windings are connected in series with the primary windings (M1 1 to M1N), and multiple secondary windings (M21 to M2N) corresponding to the primary windings are connected in parallel with each other.

Abstract: Provided are methods for controlling operation of a voltage regulator of a single-phase of a three-phase power system to regulate a measured voltage. One of the methods includes recording a first elapsed time between detecting a first excursion of the measured voltage from an in-band area to an out-of-band area, and a first return of the measured voltage to the in-band area. The method also includes recording a second elapsed time period (dip period) between detecting the first return and a second excursion of the measured voltage from the in-band area to an out-of-band area. If the second elapsed time period is less than a predetermined dip time period, causing a tap position change of the voltage regulator upon expiration of a countdown period initiated upon detecting the first excursion, thereby adjusting the measured voltage to the in-band area while allowing a voltage drop of limited length.

Abstract: Provided are methods for controlling operation of a voltage regulator of a single-phase of a three-phase power system to regulate a measured voltage. One of the methods includes recording a first elapsed time between detecting a first excursion of the measured voltage from an in-band area to an out-of-band area, and a first return of the measured voltage to the in-band area. The method also includes recording a second elapsed time period (dip period) between detecting the first return and a second excursion of the measured voltage from the in-band area to an out-of-band area. If the second elapsed time period is less than a predetermined dip time period, causing a tap position change of the voltage regulator upon expiration of a countdown period initiated upon detecting the first excursion, thereby adjusting the measured voltage to the in-band area while allowing a voltage drop of limited length.

Abstract: An apparatus connected to an energy storage device for powering an electric motor and optionally providing a warming function for the energy storage device is disclosed. The apparatus includes a circuit connected to the electric motor and the energy storage device for generating a current. The apparatus also includes a switching device operably associated with the circuit for selectively directing the current to one of the electric motor and the energy storage device.

Abstract: A function-expansion device is detachably connected to electronic equipment to expand functions of the electronic equipment. The function-ezpansion device includes a component unit which provides an extended function of the electronic equipment. A docking station detachably mounts the component unit on the docking station, the docking station connecting the component unit to the electronic equipment. The component unit is detachable from the docking station when the docking station is attached to the electronic equipment which is in an operating condition.

Abstract: An electric device is provided as an interface between a permanent power source and an electrical appliance for maintaining the appliance, or a component thereof, in an operative state during a momentary power failure. The electric circuit includes an auto-transformer for increasing the induced back electric magnetic field voltage which is present in the line voltage of the permanent power source during a momentary power outage. The auto-transformer increases the induced back electric magnetic field voltage to a voltage level which is sufficient to maintain digital clocks or other low power-requiring components incorporated in an electrical appliance in an operative state during a momentary power outage.

Abstract: A motor vehicle powered by a DC motor has a pedal which is depressed by the driver to increase speed by actuating a tapping switch which has two sets of moving contacts cooperating with stationary contacts to progressively connect with the motor batteries from one or the other end of a bank of series connected batteries. An alternate action relay connected between said motor and the switch determines which of the two sets is connected in circuit with the motor. The relay has two positions to alternately connect one or the other of the tapping switch contact sets in circuit with said motor. A main solenoid switch is connected in series with the relay and the tapping switch. When the pedal is depressed, a foot switch operated by the pedal is operative to close a circuit enabling energization of the alternate action relay and the main solenoid switch. A microprocessor controls operation of the relay and the main solenoid.