A motor vehicle multi-voltage battery device includes a first output current terminal and a ground terminal providing a first rated voltage; a second output current terminal and the ground terminal providing a second rated voltage; a first battery cell group, electrically connected to the first output current terminal and to the ground terminal; a second battery cell group, electrically connected to the second output current terminal and to the first output current terminal and switchably connected in series with the first battery cell group; a charging current terminal connecting the multi-voltage battery device to an external current source; a first DC voltage converter electrically connected on the input voltage side to the charging current terminal and on an output voltage side to a first positive pole, and configured to convert an input voltage at the charging current terminal to a first charging voltage for charging the first battery cell group.

The invention relates to a method for reducing the overall power consumption of a parked vehicle, whereby said vehicle comprises a DC power network including two batteries connected in series and an equalizer circuit, whereby the equalizer circuit includes a DC/DC converter for converting an input voltage corresponding to the sum of the voltages of the two batteries into an output voltage to be applied to a first battery of the two batteries. The method consists in i) activating the DC/DC converter only when the State of Charge (SoC) of the first battery reaches a first level below the State of Charge (SoC) of the second battery; and u) keeping the DC/DC converter active until the State of Charge (SoC) of the first battery reaches a second level above the State of Charge (SoC) of the second battery.

An apparatus including a monitoring unit including a voltage detection circuit which detects a voltage of the plurality of battery cells, a balancing unit including a first common resistor element and a switching module, the first common resistor element connected between a first common node and a second common node, and a control unit operably coupled to the monitoring unit and the switching module, the control unit determining a balancing target including at least one of the plurality of battery cells based on the voltage of each of the plurality of battery cells, and controlling the switching module to form a current channel between the first common resistor element and the balancing target.

Various embodiments relate to an electronic device and a method for outputting an alert, and a system comprising a locking device coupled to the electronic device. To this end, the electronic device, according to various embodiments, comprises: a connection terminal; and a processor, wherein the processor is configured to: detect a connection with a locking device via the connection terminal; receive an identifier of the locking device from the locking device; identify the received identifier to set the electronic device in an alert mode; detect a disconnection between the electronic device and the locking device; and output an alert in response to the detected disconnection. Other embodiments may be possible.

The present invention discloses a battery and an external component, which belong to the field of power supply technologies for a movie and television shooting apparatus. The battery of the present invention is used in cooperation with an external component, including at least two battery packs, a microcontroller, and a series-parallel switching circuit, and further including a connector in cooperation with the external component, the microcontroller controlling the series-parallel switching circuit according to a cooperation state of the connector and the external component, so that the battery packs are connected in series or in parallel. The present invention can be compatible with a high/low voltage camera and a high/low voltage charger automatically.

A method for operating electrical energy stores, in particular for use in motor vehicles, the method including: ascertaining a charge state of a first energy store with the aid of an evaluation unit, ascertaining a charge state of a second energy store with the aid of an evaluation unit, ascertaining an instantaneous power demand with the aid of an evaluation unit, adapting an operation of at least one energy store on the basis of the ascertained charge states and the ascertained instantaneous power demand with the aid of a control unit, the adapting being made using at least one semiconductor switch, in particular bidirectionally.

A cascaded conversion system and a voltage equalizing control method thereof are provided. The cascaded conversion system includes a plurality of conversion circuits connected in cascade. Each conversion circuit includes a DC-side capacitor, a switching unit and a control unit. The DC-side capacitors of the conversion circuits are electrically connected in series. In each conversion circuit, the switching unit is connected to the DC-side capacitor in parallel and includes a plurality of bridge arms. Each bridge arm includes a first switch and a second switch. The control unit controls the switches according to the voltage across the DC-side capacitor. The control unit controls the first and second switches to be turned on alternately. All the first switches are turned on and off simultaneously, and all the second switches are turned on and off simultaneously, thereby making the voltages across the DC-side capacitors of the conversion circuits equal.

A drone is described. The drone includes a propulsion system, a transceiver, a tether connector, and a power system. The power system has a battery and a chopper circuit. The chopper circuit bleeds excess charge from the battery. The power system is configured to power the propulsion system, and to power the transceiver through the chopper circuit. The power system is also configured to receive electrical power, through the tether connector, to charge the battery while the drone is in the air.

An electronic device includes a housing, a display exposed through one surface of the housing, at least one ground member, a first battery disposed in the housing and including a first anode and a first cathode, a second battery disposed in the housing and including a second anode and a second cathode electrically connected with the at least one ground member, a charging circuit electrically connected with the first battery and the second battery, a charging interface electrically connected with the charging circuit, and a power management integrated circuit electrically connected with the charging interface and the charging circuit and managing power supplied to the electronic device. When an external power source is connected through the charging interface, the charging circuit connects the first battery and the second battery in series during a first time period and connects the first battery and the second battery in parallel during a second time period.

A system for suppressing inrush currents is described. The system may include a negative temperature coefficient (NTC) thermistor and a positive temperature coefficient (PTC) thermistor arranged in series between a power source and a battery system to be charged. At a low temperature, while the PTC thermistor provides only minimal resistance to minimize an inrush current, the NTC thermistor provides increased resistance. As the temperature increases, the resistance provided by the PTC thermistor increases as the resistance from the NTC thermistor decreases. The system may be used in conjunction with a battery charging system has at least one current pathway from the power source to the battery system.