Abstract: A modular multilevel converter system, and a voltage detection method and an open-circuit fault diagnosis method thereof are disclosed. The modular multilevel converter system includes: N sub-modules sequentially cascaded, where N is an integer greater than or equal to 2, each of the sub-modules comprising at least one bridge arm and a capacitor connected in parallel to the bridge arm, the capacitor having a positive terminal and a negative terminal; and a voltage detection unit for detecting a voltage between at least two adjacent sub-modules in the N sub-modules, the voltage detection unit being connected between the positive terminal of the capacitor of the first sub-module and the negative terminal of the capacitor of the last sub-module in the at least two sub-modules.

Abstract: An arrangement for supporting a child behind a stroller, includes an axle attachment member adapted to be secured to an axle of the stroller; and a standing board adapted to be secured to the axle attachment member or the axle of the stroller, and including an elongated planar board, at least one wheel secured to a rear section of the planar board, first and second spaced apart attachment openings in an upper surface of the planar board, a seat assembly, handle or plug releasably securable in either attachment opening, transversely aligned wing openings in opposite side surfaces of the planar board, and wings selectively and releasably securable in the wing openings so as to extend transversely out from the planar board, and a stroller attachment member at a front end of the planar board for removable securement to either the stroller or axle attachment member.

Abstract: A projection system includes a light source module, an image device, a first light sensor, a second light sensor, and a processor. The light source module has at least one solid-state light-emitting device. The processor is communicatively coupled to the light source module, the first light sensor, and the second light sensor and is configured to execute a calibration procedure.

Abstract: A wireless power-charging module is provided, including a magnetic core, a coil, and a magnetic glue, wherein a gap is formed between the magnetic core and the coil. The coil and the magnetic glue are disposed on the surface of the magnetic core, wherein the magnetic glue fills the gap between the magnetic core and the coil.

Abstract: In order to balance the thermal stress of the switches (S1-S4) of the two legs of an inverter full bridge (4), the driving signals are generated using an up-down counter having a modulation period Tmod of twice the period T of the input voltage (Vin). The up-down counter has a first compare value (41) of D/4 and a second compare value (42) of (2+D)/4, where D is the duty cycle and where the second half bridge is phase shifted by the period T.

Abstract: The present disclosure provides an electromagnetic field transceiver device and a wireless charging device, including: a cover body, a selective shielding cover, a sealing ring and a transceiver unit. The selective shielding cover is provided with an electromagnetic field transceiver window that selectively shields an electric field and/or a magnetic field. The sealing ring sleeves the cover body. The selective shielding cover is seamlessly connected to an opening of the cover body relative to the electric field or the magnetic field through the sealing ring, the selective shielding cover and the cover body form a cavity. The sealing ring is electrically connected to the selective shielding cover, and the sealing ring encloses the electromagnetic field transceiver window. The transceiver unit is provided in the cavity. The transceiver unit is configured to receive or transmit a target electromagnetic field.

Abstract: A bus bar assembly is provided and includes a first linking bus bar, a second linking bus bar and plural power connectors. The first linking bus bar includes a first main bar, a first bending part, a first conducting part and plural second conducting parts. The second conducting parts connect with the first main bar, respectively. The first bending part connects between the first main bar and the first conducting part. The second linking bus bar is disposed corresponding to and isolated from the first linking bus bar, and includes a second main bar, a second bending part, a third conducting part and plural fourth conducting parts. The fourth conducting parts connect with the second main bar, respectively. The second bending part connects between the second main bar and the third conducting part. The power connectors are electrically coupled with the second conducting parts and the fourth conducting parts.

Abstract: Multilevel conversion circuit having a flying capacitor and method for pre-charging the same are provided. The multilevel conversion circuit includes: a first bridge arm including a plurality of switches connected in series; a second bridge arm including a plurality of switches connected in series and a flying capacitor group, midpoints of the two bridge arms connected to a power supply and an inductor to form a series branch; a DC bus capacitor to which the two bridge arms are connected in parallel; a first voltage clamping module connected between a first end of the flying capacitor group and a first end of the DC bus capacitor; and a second voltage clamping module connected between a second end of the flying capacitor group and a second end of the DC bus capacitor.

Abstract: Disclosed is a flying capacitor three-level converter, including a plurality of circuit units, wherein each of the plurality of circuit units includes: an input capacitor; a bridge arm, electrically connected with the input capacitor in parallel, wherein the bridge arm includes a first switch, a second switch, a third switch and a fourth switch electrically and sequentially connected in series; and a flying capacitor unit, wherein the flying capacitor unit includes a first capacitor and a second capacitor, and the first capacitor and the second capacitor are electrically connected in parallel and electrically connected with a series branch in parallel, and the series branch includes the second switch and the third switch; wherein the input capacitor, the first switch, the first capacitor and the fourth switch form a first switching loop, and the second capacitor, the second switch and the third switch form a second switching loop.

Abstract: Provided are a sensor arrangement for a foreign object detection device for a wireless power transfer system, a foreign object detection and a primary part for a wireless power transfer system. The sensor arrangement includes multiple detection cells, each including a sense coil including a winding spirally wound in a plane and having multiple turns. Multiple input leads and one or more output leads are provided such that each detection cell may be connected to a current input and a current output. The sense coil of at least one detection cell includes an outer coil section and an inner coil section arranged inside the outer coil section, where a first distance between an outermost turn of the inner coil section and an innermost turn of the outer coil section is at least twice a largest distance between two turns of the outer coil section.

Abstract: A power converter-circuit (100) having a transformer (T), comprising a snubber-circuit (Csn, DSn,S3, S3, DSn,S4) for suppressing voltage peaks on a secondary side of the transformer (T) that comprises a snubber capacitor (Csn); and an auxiliary DC-DC converter (101) having a first input connected with the snubber capacitor (Csn) and a first output connected with a first output (VOut) of the power converter-circuit (100). This circuit increases efficiency of electrical conversion and reduces thermal losses.

Abstract: The present disclosure provides a troubleshooting system for current sensors including a motor, three current sensors and a controller. The three current sensors respectively sense three phase currents of the three-phase current of the motor to obtain three current sensing values. The controller is configured to control the three-phase current of the motor. When the sum of the three current sensing values is greater than a threshold, the controller controls the three phase currents to be zero, and a first offset sensor and a current offset are obtained. When the sum of the three current sensing values equals the current offset, a second offset sensor is obtained. If the first offset sensor and the second offset sensor are the same current sensor, the controller outputs a warning signal, if the first offset sensor and the second offset sensor are different current sensors, the controller controls the motor to stop operating.

Abstract: A magnetic element includes a first magnetic core, a second magnetic core, a first winding and a second winding. The first magnetic core includes a first lateral core part, a second lateral core part and a first middle core part between the first lateral core part and the second lateral core part. The second magnetic core includes a third lateral core part, a fourth lateral core part and a second middle core part between the third lateral core part and the fourth lateral core part. The third lateral core part is located beside the first middle core part. The second middle core part is located beside the second lateral core part. The first winding is wound around the first middle core part and the third lateral core part. The second winding is wound around the second middle core part and the second lateral core part.

Abstract: A mesh hook surface fastener does not lose engagement ability even when subjected to mold-in forming and gives only a slight feeling of something foreign. The mesh hook surface fastener contains first shape holding ribs (a21) with a relatively small protrusion height and second shape holding ribs (a22) with a relatively large protrusion height which protrude to the opposite side of hook-shaped engagement elements (B1, B2) across a base layer (A1) and are alternately arranged. The heights of the adjacent shape holding ribs (a21, a22) are different, which prevents the direct entrance of a foamable resin liquid and weakens its force. As the force weakens, foaming and curing progress more readily and, as a result, the amount of the foamable resin liquid that passes through meshes of the base layer to reach the hook-shaped engagement elements can be reduced.