Abstract: Aspects of the disclosure include a power system comprising a power-supply device having an output, the power-supply device being configured to provide output power to the output of the power-supply device, and control circuitry configured to receive voltage information indicative of a voltage of a battery, determine that the voltage of the battery is above a first voltage threshold, activate a shutdown signal responsive to determining that the voltage of the battery is above the first voltage threshold, determine that the voltage of the battery is below a second voltage threshold, the second voltage threshold being less than the first voltage threshold, control the power-supply device to disable the output power to the output of the power-supply device responsive to determining that the voltage of the battery is below the second voltage threshold and that the shutdown signal is activated, and control the power-supply device to provide the output power to the output of the power-supply device responsive to de

Abstract: In an IoT device data management method, an IoT device sends a data report message to a device management server, to report a device identifier of the IoT device and a SIM card identifier of a SIM card in the IoT device. The device management server stores the device identifier and the SIM card identifier, and may further synchronize the device identifier and the SIM card identifier to a connectivity management server. In this way, the device management server establishes and maintains a correspondence between the device identifier of the IoT device and the SIM card identifier.

Abstract: According to one aspect, a UPS system is provided including an input configured to receive AC input power, an output configured to provide AC output power to a load, a rectifier coupled to the input, an inverter coupled to the rectifier and the output, an auxiliary branch coupled to the input and the output, and a controller coupled to the rectifier, the inverter, and the auxiliary branch, and configured to receive voltage information indicative of a voltage level of the AC input power and AC output power, select, based on the voltage information satisfying a first condition, a buck mode of operation, select, based on the voltage information satisfying a second condition, a freewheel mode of operation, and communicate one or more control signals to at least one of the rectifier, the inverter, and the auxiliary branch based on the selected mode of operation.

Abstract: According to one aspect, a UPS system is provided including an input configured to receive AC input power, an output configured to provide AC output power to a load, a rectifier coupled to the input, an inverter coupled to the rectifier and the output, an auxiliary branch coupled to the input and the output, and a controller coupled to the rectifier, the inverter, and the auxiliary branch, and configured to receive voltage information indicative of a voltage level of the AC input power and AC output power, select, based on the voltage information satisfying a first condition, a buck mode of operation, select, based on the voltage information satisfying a second condition, a freewheel mode of operation, and communicate one or more control signals to at least one of the rectifier, the inverter, and the auxiliary branch based on the selected mode of operation.