Abstract: An uninterruptible power supply device, and method of use thereof, including a multiple-input source AC converter for receiving an AC input voltage and a DC input voltage, an inverter including a combiner module for combining the input power sources, and an AC/AC switching transformer, the inverter being controlled by a controller to provide an output voltage signal, the controller configured to sample the input voltage signal, the switching signal current and the output voltage signal, and to control the switching transformer based thereon so as to render the output voltage signal sinusoidal.

Abstract: A method, system and apparatus for controlling a pulse width modulator (PWM) converter for direct AC/AC conversion and/or AC voltage regulation. According to some embodiments of the invention, an output voltage may be provided, independent of the input voltage quality, thereby avoiding or minimizing power company irregularities, brownouts and the like. Embodiments of the present invention may be useful, for example, for use in connection with motors and motored devices or other applications.

Abstract: An uninterruptible power supply device, and method of use thereof, including a multiple-input source AC converter for receiving an AC input voltage and a DC input voltage, an inverter including a combiner module for combining the input power sources, and an AC/AC switching transformer, the inverter being controlled by a controller to provide an output voltage signal, the controller configured to sample the input voltage signal, the switching signal current and the output voltage signal, and to control the switching transformer based thereon so as to render the output voltage signal sinusoidal.

Abstract: A method, system and apparatus for controlling a pulse width modulator (PWM) converter for direct AC/AC conversion and/or AC voltage regulation. According to some embodiments of the invention, an output voltage may be provided, independent of the input voltage quality, thereby avoiding or minimizing power company irregularities, brownouts and the like. Embodiments of the present invention may be useful, for example, for use in connection with motors and motored devices or other applications.

Abstract: A method, system and apparatus for controlling a pulse width modulator (PMW) converter for direct AC/AC conversion and/or AC voltage regulation. According to some embodiments of the invention, an output voltage may be provided, independent of the input voltage quality, thereby avoiding or minimizing power company irregularities, brownouts and the like. Embodiments of the present invention may be useful, for example, for use in connection with motors and motored devices or other applications.

Abstract: A method, system and apparatus for controlling a pulse width modulator (PMW) converter for direct AC/AC conversion and/or AC voltage regulation. According to some embodiments of the invention, an output voltage may be provided, independent of the input voltage quality, thereby avoiding or minimizing power company irregularities, brownouts and the like. Embodiments of the present invention may be useful, for example, for use in connection with motors and motored devices or other applications.

Abstract: A system to connect an electrical device to a switch which connects or disconnects the device to the power source, and providing power to the charger and/or another operational circuit of the device, for example, keep-alive circuit, with no dependency in the state of the switch.

Abstract: A method for activation of an electrical device, for example, in case of power loss. The method may include sensing an effect associated with activity of the electrical device, detecting an electrical power interruption, and activating the electrical device if a change in the effect of the device is sensed in proximity to the power interruption. The invention also provides an activation circuit for activation of an electrical device. The activation circuit may include a device operation detector for sensing an effect associated with activity of the electrical device, a power supply detector for detecting an electrical power interruption, and a driver for activating the electrical device if a change in operation of the device if the change is sensed in proximity to the power interruption.

Abstract: A spinning device for easy and safe operation, in which the rotation of the device may be activated by simple means, and therefore the device may be suitable for use by children. In addition, the use of a spinning blade may provide special airflow inside the device, which may cause the device to spin substantially as long as power is applied to an electric motor of the device.

Abstract: A method, system and apparatus for controlling a pulse width modulator (PMW) converter for direct AC/AC conversion and/or AC voltage regulation. According to some embodiments of the invention, an output voltage may be provided, independent of the input voltage quality, thereby avoiding or minimizing power company irregularities, brownouts and the like. Embodiments of the present invention may be useful, for example, for use in connection with motors and motored devices or other applications.

Abstract: The invention provides a method for economical emergency activation of an electrical device, the method comprising sensing an effect associated with activity of the electrical device, detecting an electrical power interruption and activating the electrical device during the electrical power interruption, in case decrease in the effect is sensed in time proximity to the power interruption. The invention also provides an activation circuit for economical emergency activation of an electrical device, the activation circuit comprising a detector for sensing an effect associated with activity of the electrical device, a voltage detector for detecting an electrical power interruption and a driver for activating the electrical device during the electrical power interruption, in case decrease in the effect is sensed from before the electrical power interruption until after the beginning of the electrical power interruption.

Abstract: A system to connect an electrical device to a switch which connects or disconnects the device to the power source, and providing power to the charger and/or another operational circuit of the device, for example, keep-alive circuit, with no dependency in the state of the switch.

Abstract: A method for controlling a power supply is provided. The method includes sensing a total current output by the power supply and sensing a charging current drawn from the power supply by a back-up power source. When the charging current exceeds a selected limit, a signal is provided to reduce the output voltage of the power supply. When the total current of the power supply exceeds a selected limit, a signal is provided to reduce the output voltage of the power supply.