A tracking device and system is provided. In one aspect the tracking device comprises more than one type of transceiver; a GPS receiver; a microcontroller which controls the transceivers and GPS receiver; a power source for providing power to the transceivers, GPS receiver and microcontroller; and a secure band for attachment to a wearer. The tracking system includes a tracking device comprising more than one type of transceiver and a GPS receiver; a user device configured to send a wakeup signal to the tracking device; and a communication channel for communication of a function command to the tracking device.

Systems, devices and automated processes are provided for configuring backup battery power for RF radio operations at a base station, including a module configured to communicate with an API tool to receive a plurality of data sets using an open API format about metrics of various operating distributed power sources; a cell site module configured to monitor power usage at a cell site and to generate a series of data sets about the power usage at the cell site; an analysis module configured to correlate the plurality of data sets of the various operated distributed power sources with the series of data sets of power usage at the cell site; the analysis module to forecast a frequency and a duration of a power outage at the cell site based on metrics of correlated data of the data sets of the various operated distributed power sources and the series of data sets about power usage at the cell site; and a backup power supply configured with a capacity at the cell site based on the metrics derived from the correlated data wherein the capacity backup power supply is determined in accordance the frequency and the duration of the power outage at the cell site.

A control circuit for a main switch is provided. The control circuit includes an output voltage tracker, a main switch bias generator, and a reference current device. The output voltage tracker is coupled to the main output end and generates a first tracking voltage positively correlated to an output voltage. The main switch bias generator, in response to the first tracking voltage, generates a second tracking voltage substantially equal to the output voltage. The reference current device is coupled to the main switch bias generator and is used to generate a control voltage on a main control end. The reference current device is used to limit the maximum value of the output current. The main switch and a duplicating switching element of the main switch bias generator form a current mirror configuration circuit. The consuming current of the output voltage tracker is positively correlated to the output current.

A node within a wireless network is powered by a solar hybrid battery system. The solar hybrid battery system includes a solar panel, a primary cell, and a secondary cell. The secondary cell includes only enough power storage to be capable of powering the node during the longest daily interval of darkness in the region where the node is deployed. The solar panel is sized relative to the secondary cell to be capable of fully recharging the secondary cell during the shortest daily interval of daylight in the region where the node is deployed, even under conditions of limited solar irradiance (e.g. due to clouds). The primary cell can charge the secondary battery if the node is shelved or malfunctioning to prevent the secondary cell from becoming overly depleted. The primary cell can also provide the node with additional power during times of peak demand or to perform status reports.

Systems, devices and automated processes are provided for configuring backup battery power for RF radio operations at a base station, including a module configured to communicate with an API tool to receive a plurality of data sets using an open API format about metrics of various operating distributed power sources; a cell site module configured to monitor power usage at a cell site and to generate a series of data sets about the power usage at the cell site; an analysis module configured to correlate the plurality of data sets of the various operated distributed power sources with the series of data sets of power usage at the cell site; the analysis module to forecast a frequency and a duration of a power outage at the cell site based on metrics of correlated data of the data sets of the various operated distributed power sources and the series of data sets about power usage at the cell site; and a backup power supply configured with a capacity at the cell site based on the metrics derived from the correlated data wherein the capacity backup power supply is determined in accordance the frequency and the duration of the power outage at the cell site.

A method for providing electromagnetic shielding of a semiconductor die includes attaching a semiconductor die to a package substrate of a packaged radio frequency module, where the package substrate includes one or more radio frequency circuits fabricated therein. The method also includes encapsulating the semiconductor die with a molding compound. The method also includes at least partially covering the molding compound with an electromagnetic shielding structure having an outer layer including cobalt. A phone board assembly can include the packaged radio frequency module attached to a printed circuit board. The packaged radio frequency module can be incorporated into a mobile device.

An online platform generates a playlist of clips of a lecture accessed by a plurality of users of the online platform. The online platform receives a recording of the lecture, and receives a plurality of events captured during a time period corresponding to the lecture. Each captured event is associated with a time stamp corresponding to a time at which a user performed an activity while listening to the lecture. The online platform clusters the captured events based on the time stamps, and generates one or more clips of the recording of the lecture from the clustered events. The online platform generates a playlist including the clips of the lecture.

A battery controller buffers a higher voltage provided by a primary cell in order to charge a secondary cell that operates at a lower voltage. The battery controller includes a storage device that is charged by the primary cell. When the voltage of the storage device reaches a threshold, the battery controller conducts the stored charge into the secondary cell while isolating the secondary cell from the primary cell. The secondary cell, when charged, powers a node that operates with a low voltage.

A communication device includes a device for mechanically generating a rotational movement that includes a drive rod and a pushbutton for generating a linear movement of the drive rod and at least one gear wheel which, in the event of a linear movement of the drive rod, is set in rotational motion. The device further includes a converter module connected to the movement module that converts the rotational movement into electrical energy, an energy management module connected to the converter module that the electrical energy in line with prespecified boundary conditions, and a transmission module for transmitting information.

A method for controlling earphone switching and an earphone are provided. The method includes the following. A first earphone acquires a first remaining power and a first operating parameter of the first earphone and a second remaining power and a second operating parameter of a second earphone. The second earphone serves as a slave earphone. The first earphone predicts a first battery life of the first earphone according to the first remaining power and the first operating parameter and a second battery life of the second earphone according to the second remaining power and the second operating parameter. The first earphone predicts switches the second earphone to serve as a master earphone and the first earphone to serve as a slave earphone, when a difference between the second battery life and the first battery life is greater than a first preset threshold.