A method for operation of UPS modules connected in parallel is provided. The method includes: in a case that a UPS system is constructed based on multiple UPS modules connected in parallel, sleeping, based on a system load rate, a predetermined number of UPS modules to control the UPS system to operate at a predetermined efficiency level; controlling UPS modules not being slept in the UPS system to enter into a main-inverter power supply mode or a main-bypass common mode to perform reactive power and harmonic compensation; and waking up the slept UPS modules when the system load rate drops by a predetermined value due to a sudden addition of a load. The UPS modules can be slept or waked up intelligently based on the system load rate in the dynamic online mode, ensuring that the UPS system operates around highest efficiency.

A battery saving system (1) for an electrically powered mobility device (13) comprising a battery (15) and a drive control system (16) configured to be powered by the battery, wherein the battery saving system (1) comprises: a current monitoring circuit (3) configured to monitor a load current provided by the battery (15), wherein the current monitoring circuit (3) is configured to determine whether a load current magnitude is below a load current threshold level, a timer circuit (7) having a counter configured to successively count as long as the load current magnitude level is below the load current threshold level, and to reset the counter in the event that the load current level magnitude exceeds the current threshold level, and a disconnecting switch (9) configured to be operated between an open state and a closed state, wherein the timer circuit (7) is configured to trigger the disconnecting switch (9) to obtain the open state when the counter has reached a predetermined number to thereby disconnect the battery (15) from the drive control system (16).

A control module (120,120a-b) for controlling a plurality of power switching elements (111a-d) arranged for controlling provision of power to one or more wireless network devices (125a-c); wherein the control module (120,120a-b) comprises a processor (122) arranged for: determining which one of the plurality of power switching elements (111a-d) the control module (120,120a-b) receives power through; determining a set of the plurality of wireless network devices (125a-c) which receives power via a first power switching element out of the plurality of power switching elements (111a-d); determining that the set includes all the wireless network devices which receive power via the first power switching element; determining operational state of each of the wireless network devices in the set; determining whether the control module (120,120a-b) receives power via the first power switching element; evaluating a first set of conditions; wherein the first set of conditions comprises that the control module (120,120a-b) does not receive power via the first power switching element and the determined operational state indicates that each of the wireless network devices in the set does not require power, controlling, based on a positive result of the evaluation of the first set of conditions, the first power switching element to cease power provision to the set of wireless network devices.

Electronic controller comprising: —a power supply (11) connectable to a power supply network (12); —at least one connector (13a, 13b, 13c) adapted to be connected to a load (14a, 14b, 14c) in order to supply it; —a microcontroller (15) connected to the power supply (11) and to the at least one connector (13a, 13b, 13c) in order to apply to the latter a supply voltage in a controlled manner; —at least one detection device (16a, 16b, 16c, 16d) configured to detect a current flow through the connector (13a, 13b, 13c). The microcontroller (15) is connected to the detection device (16a, 16b, 16c, 16d) and is configured to zero the supply voltage if, following application of the supply voltage, the detection device (16a, 16b, 16c, 16d) does not detect a current flow through the connector (13a, 13b, 13c).

An embedded power supply apparatus is partially buried in an enclosed structure, is configured to provide a first DC voltage to a plurality of electronic devices, and includes a first power conversion circuit, a plurality of switch circuits, a human-machine interface module and a control circuit. The first power conversion circuit is configured to convert an input AC voltage into the first DC voltage and provide the first DC voltage to the switch circuits. The switch circuits each is configured to selectively transmit the first DC voltage to a corresponding electronic device of the electronic devices according to a corresponding first control signal of a plurality of first control signals. The control circuit is configured to receive a second control signal generated by the human-machine interface module, and generate the first control signals to the switch circuits according to the second control signal.

Embodiments of the present invention disclose a battery switch-on circuit, including a power supply circuit and a switch circuit. The power supply circuit includes a battery power supply unit, a first voltage dividing resistor, a second voltage dividing resistor, and a fourth switch device. The switch circuit includes a dual-channel voltage comparison unit and a switch control unit. A first input terminal of the dual-channel voltage comparison unit is electrically connected to a positive electrode of the battery power supply unit. A second input terminal of the dual-channel voltage comparison unit is electrically connected to an output terminal of the fourth switch device. The dual-channel voltage comparison unit is configured to transmit, when a positive electrode voltage of the battery power supply unit is lower than a reference voltage, a first control signal to the first control terminal of the switch control unit to cause the fourth switch device to switch off, and is further configured to transmit, when an output terminal voltage of the fourth switch device is higher than the reference voltage, a second control signal to the second control terminal of the switch control unit to cause the fourth switch device to switch on. This solution achieves automatic switch-on of the battery power supply unit when a load is connected.

An energy saving device that is adapted to be connected to a power outlet and further connected to at least one electrical device, said electrical devices drawing power through the energy saving device, the energy saving device including testing means adapted to perform at least one installation verification test and communication means adapted to communicate a validation signal to a monitoring entity when a result of the installation verification test indicates that a correct installation has occurred.

A charger appliance configured to determine a no-load, disconnected state from an electronic device having a rechargeable battery, and configured to determine a connected state of the charger with an electronic device in which recharging power may be supplied through the charger to the electronic device. Automatic connection and disconnection of a mains power supply is made depending on the detected state of the charger to avoid wasteful energy consumption in a no-load state. State detection may be determined by monitoring a voltage on one or more signal lines associated with the electronic device.

A quiescent power supply including an AC/DC converter, a switch, an energy storage device, and a controller is disclosed. The switch is electrically coupled to the AC/DC converter to electrically disconnect the AC/DC converter from an AC supply line. The controller is operably coupled to the switch to actuate the switch. In particular, the controller can actuate the switch to disconnect the switch during when the AC/DC converter is idle.

A working method of a modular uninterruptible power supply (UPS) includes: obtaining working parameters of the modular UPS, where the working parameters include an input voltage parameter, a load parameter, and a battery parameter; and adjusting a working mode of a power module in the modular UPS according to at least one of the working parameters of the modular UPS, so that not all power modules are in a same working mode, where the modular UPS includes K working modules, and 2≤K.