A system, apparatus, and method are disclosed for providing electrical charge to residents of a controlled-environment facility. In an embodiment, a charging station may be provided in an area accessible to an inmate to allow charging of in an inmate smart device, such as a phone or tablet. In an embodiment, a portable charger may be provided to an inmate for charging a smart device.

Aspects of the present invention relates to a communications module for a door station, comprising a connection interface for communications with at least one door station in accordance with a door station communication protocol, a network interface for communications via a network in accordance with a network communication protocol, and a controller coupling the network interface and the connection interface, wherein the controller is configured to set or change the door station communications protocol of the connection interface. Further aspects of the present invention relate to a method of operating a communications module of a door station.

The present disclosure discloses a charging system and a charging method and a power adapter. The system includes a battery, a first rectifier, a switch unit, a transformer, a second rectifier, a first charging interface, a sampling unit and a control unit. The control unit outputs a control signal to the switch unit, and adjusts a duty ratio of the control signal according to a current sampling value and/or a voltage sampling value sampled by the sampling unit, such that a third voltage with a third ripple waveform outputted by the second rectifier meets a charging requirement of the battery.

The present disclosure discloses a charging system and a charging method and a power adapter. The system includes a battery, a first rectifier, a switch unit, a transformer, a second rectifier, a first charging interface, a sampling unit and a control unit. The control unit outputs a control signal to the switch unit, and adjusts a duty ratio of the control signal according to a current sampling value and/or a voltage sampling value sampled by the sampling unit, such that a third voltage with a third ripple waveform outputted by the second rectifier meets a charging requirement of the battery.

This application relates to monitoring of electronic devices (100) and in particular to methods and apparatus for the detection and recording of an electrical overstress applied to a connector (101, 102) of the device. The apparatus describes an integrated circuit integrated circuit (103, 105) of the host device having a first set of one or more circuit contacts (201, 203, 204, 205) for connection to a connector (101) of a host electronic device. The circuit has an electrical overstress monitor (106, 106a) for detecting and recording an electrical overstress comprising a voltage exceeding a predetermined parameter applied to at least one of said first set of circuit contacts. The electrical overstress monitor (106) may have an overvoltage detector (205) and may have a memory (206) for recording the occurrence of an overvoltage and/or a communication module (207) for communicating with other components of the host device in the event of an electrical overstress.

This application relates to monitoring of electronic devices (100) and in particular to methods and apparatus for the detection and recording of an electrical overstress applied to a connector (101, 102) of the device. The apparatus describes an integrated circuit integrated circuit (103, 105) of the host device having a first set of one or more circuit contacts (201, 203, 204, 205) for connection to a connector (101) of a host electronic device. The circuit has an electrical overstress monitor (106, 106a) for detecting and recording an electrical overstress comprising a voltage exceeding a predetermined parameter applied to at least one of said first set of circuit contacts. The electrical overstress monitor (106) may have an overvoltage detector (205) and may have a memory (206) for recording the occurrence of an overvoltage and/or a communication module (207) for communicating with other components of the host device in the event of an electrical overstress.

Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (DC) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.

Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (DC) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.

Methods of powering a radio that is mounted on a tower of a cellular base station are provided in which a direct current (DC) power signal is provided to the radio over a power cable and a voltage level of the output of the power supply is adjusted so as to provide a substantially constant voltage at a first end of the power cable that is remote from the power supply. Related cellular base stations and programmable power supplies are also provided.

A method is provided. The method comprises determining configuration data; wherein the configuration data comprises a resistance of a bypass circuit coupled between a remote radio head and a power cable; using the configuration data, determining the resistance of the power cable coupling a programmable power supply to the remote radio head mounted on a mounting structure, comprising: entering a calibration mode; setting an output voltage of the programmable power supply; measuring an output current of the programmable power supply; storing the output current; and determining the cable resistance; and storing the resistance of the power cable.