An air powered battery charger uses a large object's weight to drive one or more pistons that are configured to pass air through at least one air motor, which in turn drives one or more generators that supplies electrical power sufficient to recharge at least one battery.

An air powered battery charger uses a large object's weight to drive one or more pistons that are configured to pass air through at least one air motor, which in turn drives one or more generators that supplies electrical power sufficient to recharge at least one battery.

The present disclosure contemplates a method for synchronizing a large number of generators on an AC bus by synchronizing each generator's output to a nominal output that is generated from a common external source. For example, each generator, using a high speed communication signal, can synchronize to a nominal output provided by a master generator, or centralized command module. In another example, each generator can generate its own nominal output referenced to a common external time signal, such as a global positioning system (GPS) signal, or other reference. By synchronizing independently of bus voltage and frequency, the generators are able to synchronize in parallel, instead of serially.

In an uninterruptible power supply apparatus, AC current, which includes a feedback component having a value corresponding to deviation between terminal-to-terminal voltage of a capacitor and reference voltage, and a feed forward component obtained by multiplying load current by a gain, is passed into a converter such that the terminal-to-terminal voltage of the capacitor becomes the reference voltage. The gain is set to a first gain in an inverter power feed mode and a bypass power feed mode, and the gain is set to a second gain smaller than the first gain in a switching period of switching between the inverter power feed mode and the bypass power feed mode, to prevent the terminal-to-terminal voltage of the capacitor from exceeding an upper limit voltage in a lap power feed mode.

In an uninterruptible power supply apparatus, AC current, which includes a feedback component having a value corresponding to deviation between terminal-to-terminal voltage of a capacitor and reference voltage, and a feed forward component obtained by multiplying load current by a gain, is passed into a converter such that the terminal-to-terminal voltage of the capacitor becomes the reference voltage. The gain is set to a first gain in an inverter power feed mode and a bypass power feed mode, and the gain is set to a second gain smaller than the first gain in a switching period of switching between the inverter power feed mode and the bypass power feed mode, to prevent the terminal-to-terminal voltage of the capacitor from exceeding an upper limit voltage in a lap power feed mode.

There are provided systems, apparatuses, and methods for controlling power delivery from an auxiliary power supply. For example, there is provided a method that includes generating a first random number to define a timeout period. During the timeout period, the method may detect whether a voltage is present at an output of an auxiliary power supply, may disable the auxiliary power supply when the voltage is detected at the output, and may enable the auxiliary power supply when the voltage is not detected at the output.

There are provided systems, apparatuses, and methods for controlling power delivery from an auxiliary power supply. For example, there is provided a method that includes generating a first random number to define a timeout period. During the timeout period, the method may detect whether a voltage is present at an output of an auxiliary power supply, may disable the auxiliary power supply when the voltage is detected at the output, and may enable the auxiliary power supply when the voltage is not detected at the output.

During power running operation of a load, a control unit turns off a switch unit to supply AC power from an uninterruptible power supply unit to the load. During regenerative operation of the load, in a case where an AC power supply can recover regenerative power, the control unit turns off the switch unit to supply the regenerative power to the AC power supply via the uninterruptible power supply unit. In contrast, in a case where the AC power supply cannot recover the regenerative power, the control unit turns on the switch unit to cause an auxiliary load unit to consume the regenerative power.

The invention provides a hierarchically accessible monitoring system configured to be used with a standby generator, and a method of remotely accessing generator information from a standby generator. The hierarchically accessible monitoring system includes an interface unit configured to receive information from the standby generator and to communicate the generator information, and a remote data server in communication with the interface unit. The remote data server receives the generator information from the interface unit, stores the generator information, and controls access to the generator information based upon at least two hierarchical levels, each hierarchical level having different access privileges. The hierarchically accessible monitoring system also includes a user interface configured to display the generator information from the remote data server to at least one user. The user has access privileges to read the generator information based upon the user's assigned hierarchical level.

An alternating current (AC) power distribution system may include an independent speed variable frequency (ISVF) generator configured to generate an AC power signal having a frequency that is independent from a frequency of a prime mover. The system may also include at least one AC load configured to receive the AC power signal without performing a full-distribution-power-rated power conversion. In another embodiment, an AC power distribution system includes a generator configured to generate an AC power signal and an AC motor configured to receive the AC power signal without performing a full-distribution-power-rated power conversion, where the AC motor is configured to rotate at a rotational frequency that is independent from a frequency of the AC power signal.