A charging system includes a charging input interface, an inductor, a first switch, a second switch, a first voltage acquisition circuit, and a control circuit. The charging input interface is connected to the inductor, which is connected to the first switch and the second switch. The second switch is configured for electrical connection with an energy storage power supply. The first voltage acquisition circuit is connected to the second switch and configured to detect the first voltage output by the charging system in real time. The control circuit cyclically controls the switch on/off time of the first switch based on the first voltage. During the charging process of the charging system, when the first voltage is less than the first preset voltage value, the control circuit controls the first switch to conduct and starts cyclic control. The state of the first switch is opposite to that of the second switch.

Systems and methods are described herein for a smart rail with integrated sensors, microcontroller, solar panel and battery to create a dynamic shading system that is self-sufficient, and fault tolerant. In most motorized window coverings, the rechargeable motor resides in the top rail bar so that the smart rail requires a docking mechanism to charge the rechargeable motorfor the sake of this patent, this will be referred to as a distributed smart rail motor system. In other window coverings, such as certain cellular shades and horizontal blinds, it is feasible to further integrate the rechargeable motor into the smart rail for a completely integrated solutionfor tan sake of this patent, this will be referred to as an integrated smart rail motor system. A system and method are also disclosed herein for cutting fabric in-place on an adjustable shade roller.

A battery assembly and a control method thereof, a battery, and an electric apparatus are provided, where the battery assembly includes: M battery cells, the M battery cells being sequentially stacked along a first direction, where M is an integer greater than 1; and a volume of each battery cell is positively correlated with a remaining charge of the battery cell, so that when a charge of at least one battery cell among the M battery cells changes, a total volume change of the M battery cells is maintained within a first preset range.

A battery management system includes multiple chips, which include an analog front-end chip, a high-voltage management chip, a dedicated integrated chip, and a processor chip. The analog front-end chip is connected to a battery group, and is configured to detect status parameter information of at least one battery cell in the battery group. The high-voltage management chip is connected to a power cord of a battery pack, and is configured to detect status parameter information of the battery pack. The battery pack includes a plurality of battery groups. The processor chip is electrically connected to the analog front-end chip and the high-voltage management chip through the dedicated integrated chip. The processor chip is configured to manage the battery management system according to the status parameter information of the battery cell and the status parameter information of the battery pack.

A rechargeable battery system includes a battery packs, each including a rechargeable battery, power control units, each provided for one of the battery packs and each configured to adjust a voltage from the corresponding rechargeable battery, and an output terminal to which the voltage adjusted by each of the power control units is applied. The rechargeable battery system further includes a step-down converter configured to decrease the voltage from the rechargeable battery to a voltage lower than a voltage output from the output terminal, an auxiliary battery to which the voltage decreased by the step-down converter is applied, and an auxiliary device configured to be driven by the auxiliary battery.

An external battery includes a battery cell, a charging unit configured to generate a charging current with an external power supplied from a charger to an input terminal thereof and transfer the charging current to the battery cell, a main controller unit (MCU) configured to control charging of the battery cell by the charging current, and a switch unit between the charging unit and the battery cell, wherein, when the switch unit is in an on state, the MCU changes to an active mode and allows the charging current to be transferred to the battery cell, and when the switch unit is in an off state, entering by the MCU a sleep mode and cutting off the charging current transferred to the battery cell.

In some embodiments, an automatic charging device for electronic devices, such as a smart door lock, includes a charging receiving terminal comprising: an optical receiver configured to receive light energy from external light sources and convert the light energy from the external light sources to electrical energy; and an energy storage coupled to the optical receiver and configured to store the electrical energy from the optical receiver and further provide the electrical energy to charge the electronic device. The automatic charging device can be controlled to transfer electric energy from the optical receiver to the energy storage to the power unit of the electronic device in a manner such that the electronic device can remain in a powered state, avoiding the necessity of removing the battery for charging.

There is fear that some battery cells among battery cells which are serially connected may consume electric power all the time, thereby causing expansion of unbalance in voltage of the battery cells and hindering electric discharge of a battery system. When a second battery has a sufficient voltage, an electric current control board supplies operating power to a battery control unit and a relay via an external minus line and an external plus line. On the other hand, when the voltage of the second battery has decreased, the electric current control board supplies the operating power from a first battery to the battery control unit and the relay via an internal minus line and an internal plus line. A first electric current control unit and a second electric current control unit control the supply of the operating power according to, for example, the decrease in voltage of the second battery.

A wireless power transmission apparatus is provided. The apparatus includes a converter configured to perform a DC/DC power conversion operation, an inverter connected to the converter and configured to perform an AC/DC power conversion operation, a coil connected to the inverter, memory storing one or more computer programs, and one or more processors communicatively coupled to the converter, the inverter, the coil, and the memory, wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more processors individually or collectively, cause the wireless power transmission device to control the inverter to transmit first power of a first frequency through the coil, compare a first current input to the inverter through the converter with a reference value while the first power is transmitted, identify whether a packet from the outside is identified based on the first current being greater than the reference value, control the inverter to transmit second power having a second frequency lower than the first frequency through the coil based on the packet not being identified while the first power is transmitted, identify whether the packet is identified based on the second current being larger than the reference value, and identify that a foreign material is present, based on the packet not being identified while the second power is transmitted.

A circuit includes three battery groups. A first battery group is coupled to an input port. A negative electrode of a second battery group and a third battery group that are connected in parallel to each other is grounded, and a positive electrode of the second battery group and the third battery group is coupled to the first battery group through a switch. A negative electrode of the first battery group is further grounded through a switch. In addition, the input port is coupled to an output port through a buck circuit, the first battery group and the second battery group that are connected in parallel are coupled to an output of the buck circuit through a switch, and the first battery group is coupled to the output of the buck circuit through another switch. The output port is coupled to the output of the buck circuit.