Abstract: Embodiments of this application provide a power supply circuit, including a first power conversion module, a plurality of battery banks, a first bus, and a second bus. A first wiring terminal of the first power conversion module is connected to the battery bank, a second wiring terminal of the first power conversion module is connected to the first bus and the second bus, and the first power conversion module is configured to: perform direct current to direct current (DC/DC) conversion on a current output by a corresponding battery bank, and output currents to the first bus and the second bus. In this application, a quantity of battery banks are set to be less than a quantity of inverters in a UPS system, so that costs are reduced.

Abstract: A hands-free apparatus includes a memory, and a hardware processor coupled to the memory. The hardware processor is configured to: perform a hands-free connection process of connecting to a mobile phone by using a hands-free communication protocol for performing a hands-free phone conversation; perform a first data transfer process of making a first connection with the mobile phone by using a data transfer protocol for transferring phone data related to phone, and causing the phone data to be automatically or manually transferred from the mobile phone; and depending on a status of a different data transfer process than the first data transfer process, perform transfer control related to transfer by at least one of the first data transfer process and the different data transfer process.

Abstract: A method and device for controlling an electronic lock are disclosed. The electronic lock includes a lock catch and a lock body that includes a first lock hook and a second lock hook. The first lock hook has a first lock hook locking position where it is engaged with the lock catch and a first lock hook unlocking position where it is separated from the lock catch. The second lock hook has a second lock hook locking position where it locks the first lock hook in the first lock hook locking position and a second lock hook unlocking position where it is separated from the first lock hook. The method includes: detecting whether a locking operation occurs; and when detecting a locking operation, controlling at least one of the first lock hook and the second lock hook to vibrate, allowing the second lock hook to lock the first lock hook in the first lock hook locking position or to be separated from the first lock hook.

Abstract: A battery pack includes a case, a first set of battery cells and a second set of battery cells received in the case, a circuit board, and a main power output interface. The first set of battery cells and the second set of battery cells can be connected in series or in parallel, and output two kinds of working voltage through the main power output interface. The battery pack further includes an extended power output interface and a switch provided between the first set of battery cells and the second set of battery cells. The battery pack can output a third voltage for an external device through the extended power output interface when the first set of battery cells and the second set of battery cells are connected in series through the switch. It's safe and reliable when charging the external device.

Abstract: A multi-level circuit, a three-phase multi-level circuit, and a control method are provided. The multi-level circuit includes two groups of bus capacitors that are connected in series. The circuit further includes a plurality of switching transistor branches that are connected in parallel to the capacitors, where each switching transistor branch includes a first half bridge and a second half bridge, and a common terminal of the two half bridges is grounded. Furthermore, the circuit includes two coupled inductors, where each input terminal of each coupled inductor is connected to a common terminal of two switching transistors in the first half bridge in the switching transistor branches. In this circuit, a quantity of groups of bus capacitors is decreased and circuit design complexity is reduced. Further, a dropout voltage of the switching transistors is reduced.

Abstract: 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.

Abstract: An automatic teller machine includes a banknote conveyance channel, a banknote recycling channel, and a banknote circulation channel. The banknote conveyance channel includes an annular channel, a first branch channel, a second branch channel, a third branch channel, a fourth branch channel, and a fifth branch channel. A banknote-in mechanism communicates with the annular channel via the first branch channel. A temporary storage mechanism communicates with the annular channel via the second branch channel. A banknote-out mechanism communicates with the annular channel via the third branch channel. Two ends of an identification mechanism communicate with the annular channel via the fourth branch channel and the fifth branch channel, respectively. A recycling box communicates with the banknote conveyance channel via the banknote recycling channel. A circulation box communicates with the banknote circulation channel via the banknote circulation channel.

Abstract: A multi-level circuit, a three-phase multi-level circuit, and a control method are provided. The multi-level circuit includes two groups of bus capacitors (C1 and C2) that are connected in series; a plurality of switching transistor branches that are connected in parallel to the capacitors, where each switching transistor branch includes a first half bridge (Q1 and Q2) and a second half bridge (Q3 and Q4), and a common terminal of the two half bridges is grounded (N); and two negative coupled inductors (L1 and L2), where each input terminal of each negative coupled inductor is connected to a common terminal (A1 and A2) of two switching transistors in the first half bridge in only one of the switching transistor branches. In this circuit, a quantity of groups of bus capacitors is decreased and circuit design complexity is reduced. Further, a dropout voltage of the switching transistors is reduced.

Abstract: An online measurement method for temperature stability of production layers in an oil and gas well includes: obtaining a plurality of temperature data at each position point of an optical fiber; according to the temperature data, calculating temperature standard deviations of each position point within a production layer at a plurality of time points; performing probability distribution statistics according to the temperature standard deviations at all position points of the production layer at a same time point, fitting a probability distribution curve according to normal distribution, and obtaining a probability density function; obtaining the temperature standard deviations corresponding to at least one value that integral values of the probability density function at all position points of the production layer at each time point is between (0, 1), generating a standard temperature deviation normal distribution probability time curve of each section of the production layer according to the temperature stan

Abstract: A file transfer method and an electronic device are provided, and relate to the field of communications technologies, to avoid file mis-transfer and improve file transfer accuracy.

Abstract: This application provides a battery equalization circuit to resolve a problem of insufficient charging or discharging of some batteries due to differences between a plurality of batteries in a battery group. Equalization sub-circuits of the battery equalization circuit each include a battery cell, a first bidirectional switch, and a second bidirectional switch. Battery cells of the plurality of equalization sub-circuits are connected in series. When a strobe terminal of the first bidirectional switch receives a turning-on signal, the first bidirectional switch is turned on and couples the positive electrode of the battery cell to a first terminal of an energy storage device. When a strobe terminal of the second bidirectional switch receives a turning-on signal, the second bidirectional switch is turned on and couples the negative electrode of the battery cell to the second terminal of the energy storage device.

Abstract: A battery pack includes a case, a first set of battery cells and a second set of battery cells received in the case, a circuit board, and a main power output interface. The first set of battery cells and the second set of battery cells can be connected in series or in parallel, and output two kinds of working voltage through the main power output interface. The battery pack further includes an extended power output interface and a switch provided between the first set of battery cells and the second set of battery cells. The battery pack can output a third voltage for an external device through the extended power output interface when the first set of battery cells and the second set of battery cells are connected in series through the switch. It's safe and reliable when charging the external device.

Abstract: A data transfer method includes that a first device displays a first interface. The first interface includes image information of a first file. When a distance between a Near-Field Communication (NFC) chip of the first device and an electronic tag of a second device is less than a preset threshold, the first device obtains a BLUETOOTH address of the second device. The electronic tag includes device information of the second device, and the device information includes the BLUETOOTH address or a tag identifier (ID) used to obtain the BLUETOOTH address. The first device exchanges a WI-FI connection parameter with the second device through a BLUETOOTH connection corresponding to the BLUETOOTH address. The first device establishes a WI-FI connection to the second device. After the WI-FI connection is established, the first device automatically transfers the first file to the second device through the WI-FI connection.

Abstract: Disclosed are a vending method of an intelligent vending station, an intelligent vending station, an electronic device, and a storage medium. The method comprises the following steps of: determining a target item and a target vending device according to a purchase instruction from a user; determining a target cabinet accommodating the target item and determining a target conveying device; controlling the target conveying device to acquire the target item from the target cabinet and to convey the acquired target item to a receiving area of the target vending device.

Abstract: The present disclosure provides a battery pack power supply system and a battery pack power supply method.

Abstract: Disclosed are a cash box and a cash recycling and handling device; the cash box includes a box body, a first cash storage cavity, a second cash storage cavity, a transfer passage, a first switching member and a linkage assembly; a first lifting platform is provided inside the first cash storage cavity, and the first lifting platform is capable of moving back and forth in the preset direction and can be located at a first dispensing position; when the first lifting platform is in the first dispensing position, it is engaged with the linkage assembly to rotate the first switching member to a first position, and when the first lifting platform moves to a first inlet, the linkage assembly rotates the first switching member to a second position.

Abstract: Disclosed are a vending machine and an item dispensing method of storage column thereof. In the item dispensing method of the storage column of the vending machine, controlling the first motor to start rotating for the first time to convey the target item to the inlet of the bucket; when detecting that the target item reaches the inlet of the bucket, controlling the first motor to stop rotating for the first time to make the target item enter the inside of the bucket under the driving of the second motor.

Abstract: A poor-QoE assessment method and a related device are provided. The method includes: obtaining m data streams transmitted by a network device; screening the m data streams, and determining that p data streams in the m data streams and that meet a first preset condition are data streams corresponding to a first type; performing feature extraction on the data streams corresponding to the first type, to obtain known feature vectors corresponding to the first type; training, by using the known feature vectors corresponding to the first type, an untrained first poor-QoE assessment model, to obtain a trained first poor-QoE assessment model; and performing, by using the trained first poor-QoE assessment model, poor-QoE assessment on n data streams corresponding to the first type, to obtain a first poor-QoE assessment result. This method can be universally used instead of an application.

Abstract: Embodiments of this application disclose a service type determining method and a related device. A first device obtains a dataset, where the dataset includes at least two 5-tuples. The first device determines a target feature (the target feature is used to indicate a service type corresponding to a target triplet) corresponding to the target triplet based on the dataset. In this way, the first device can identify the service type corresponding to the target triplet based on the target feature, to facilitate operations such as packet transmission traffic control or application identification based on the importance indicated by the service type.

Abstract: Provided is a vending machine. The vending machine includes a control device, a cabinet, an item column, and a hopper. The hopper is located between the item column and a pickup port of the cabinet. The hopper includes a receiving bin provided with an opening. The vending machine further includes a detection device. The control device is configured to control the receiving bin to receive the item from the item column at a receiving position based on a purchase instruction from a user, and control the receiving bin to rotate from the receiving position to a first position located between the receiving position and the dispensing position based on the detection result that the item exists at the inlet of the hopper.