Abstract: A power device with a protection circuit is provided. The power device includes a power module, a power output terminal, a converter module, a bus capacitor, and a protection circuit. The power module receives an input power. The converter module, the protection circuit, and the bus capacitor is electrically connected between the power module and the power output terminal. The protection circuit is configured for overvoltage protection when the input power being overvoltage, suppressing the surge current when booting up the power device, and regulating the voltage on the bus capacitor under overvoltage and undervoltage conditions.

Abstract: An origin calibration method of a manipulator is provided. The origin calibration method includes steps of: (a) controlling the manipulator to move in accordance with a movement command, and acquiring the 3D coordinates of the reference anchor points reached by the manipulator; (b) controlling the manipulator to move in accordance with the movement command while an origin of the manipulator being offset, acquiring the 3D coordinates of the actual anchor points reached by the manipulator, and acquiring a Jacobian matrix accordingly; (c) acquiring a deviation of a rotation angle of the manipulator according to the Jacobian matrix, the 3D coordinates of the reference anchor points and the actual anchor points, and acquiring a compensation angle value according to the deviation; and (d) updating the rotation angle of the manipulator according to the compensation angle value so as to update the origin of the manipulator.

Abstract: The present disclosure provides a three-level rectification DC/DC converter including primary and secondary circuits and a resonant tank circuit. A voltage between two primary terminals is a first voltage. The secondary circuit includes a switch bridge arm and a capacitor bridge arm. The switch bridge arm includes four switches serially connected. A node between the first and second switches is connected to the first secondary terminal, a node between the third and fourth switches is connected to the second secondary terminal, and a node between the second and third switches is connected between two capacitors of the capacitor bridge arm. In two consecutive periods of the first voltage, the first and fourth switches are in an on state for a preset time length after two falling edges respectively, and the second and third switches are in the on state for the preset time length after two rising edges respectively.

Abstract: A battery controller includes an auxiliary measurement energy-storing component, a control unit, a measuring unit and a protection unit. The auxiliary measurement energy-storing component is coupled in series to a battery module outside the controller, and configured to provide an open-circuited voltage. The control unit is configured to output a power value of the battery module according to the open-circuited voltage or a value of current flowing through the battery module. The measuring unit is configured to measure the current flowing through the battery module and transmit the measuring result to the control unit. The protection unit is configured to limit the value of current measured by the measuring unit to a predetermined value. A battery level measurement method of the battery controller is also disclosed.

Abstract: A vacuum suction nozzle is provided, including a first housing, a second housing, an accommodating space, a gap, and a clamping assembly. The first housing includes a first lateral wall, a first lower surface, a channel, and a through hole. The through hole is formed on the first lateral wall. The second housing is fixedly connected to the first housing, and includes a second lateral wall and a second lower surface. The accommodating space is formed between the first lateral wall and the second lateral wall, and the through hole is opened onto the channel and the accommodating space. The gap is formed between the first lower surface and the second lower surface, and is opened onto the accommodating space. The clamping assembly is disposed in the accommodating space.

Abstract: The application provides a method for controlling a PFC circuit including a diode bridge arm, DNPC bridge arm and capacitor group connected in parallel. The control method includes: switching working mode of the PFC circuit back and forth between first mode and third mode via second mode in each switching cycle when positive half cycle of a modulation wave is modulated, and switching working mode of the PFC circuit back and forth between sixth mode and fourth mode via fifth mode in each switching cycle when negative half cycle of the modulation wave is modulated. The durations of the second and fifth modes are as short as possible, thereby decreasing a current flowing into or out from midpoint of the capacitor group, and reducing voltage fluctuation at the midpoint. The application further provides a PFC circuit using the control method and a power conversion device having the PFC circuit.

Abstract: A leakage transformer is provided. The leakage transformer includes a first plate, a second plate, a plurality of winding pillars, a primary winding, a secondary winding and a plurality of magnetic shunt elements. Each magnetic shunt element is disposed between the two corresponding winding pillars, and there is a gap between every two neighboring magnetic shunt elements. Alternatively, the magnetic shunt element is disposed on the first plate and aligned with the corresponding winding pillar, and there is a gap between the magnetic shunt element and the second plate. A leakage inductance of the leakage transformer is determined by the gap.

Abstract: A centrifugal fan is disclosed and includes a lower case, an impeller and an upper case. The lower case includes a bottom plate and a sidewall. The impeller is disposed on the bottom plate. The upper case is assembled with the sidewall to form an outlet. The upper case is formed by stamping and includes a first plane, an inlet and a grille. When the impeller is rotated, an airflow flowing from the inlet to the outlet is formed. The grille is protruded outwardly from the first plane, and includes a connecting frame and plural ribs. A spacing height is formed between the connecting frame and the inlet. Each rib has a first end connected to the connecting frame and a second end connected to the first plane. A pair of notches are disposed adjacent to two opposite lateral edges of the second end of the corresponding rib, respectively.

Abstract: A method for balancing thermal stresses in semiconductor switching devices may include (a) monitoring temperatures of the semiconductor switching devices to provide a temperature difference between two of the switching devices; and (b) based on the temperature difference, providing a zero-sequence component to be used for adjusting conduction times of each of the semiconductor devices.

Abstract: The present disclosure provides a charging device and a charging control method, and the device includes a transformer, a charger, an energy regulator, and a controller; the primary winding of the transformer is connected to the power distribution network, the power distribution network provides a first input power for the charging device; the secondary winding of the transformer is connected to an AC side of the charger and the AC side of the energy regulator respectively; the power required on the AC side of the charger is a second input power; the controller is connected to the energy regulator to control the AC side current of the energy regulator, so as to compensate the power difference between the second input power and the first input power.

Abstract: A coordinate calibration method of a manipulator is provided and includes steps of: (a) controlling the manipulator to move in accordance with a movement command, and acquiring the reference anchor points reached by the manipulator; (b) acquiring a rotation matrix and a translation vector according to the reference anchor points, and acquiring a reference coordinate system accordingly; (c) when the manipulator returning to the work space after temporarily leaving, controlling the manipulator to move in accordance with the movement command, and acquiring the actual anchor points reached by the manipulator; (d) acquiring a rotation matrix and a translation vector according to the actual anchor points, acquiring a corresponding actual coordinate system accordingly, and acquiring a coordinate compensation information by comparing the rotation matrixes and the translation vectors; and (e) adjusting the manipulator according to the coordinate compensation information, and maintaining the manipulator to operate in t

Abstract: A motor stator includes a ring-shaped core defining a rotor accommodation space, a plurality of slots, a first hairpin conductor, a second hairpin conductor, and a temperature sensor. The slots are disposed in the core and arranged to surround the rotor accommodation space circumferentially. The slots extend radially from the rotor accommodation space. The core includes an insertion side and an extension side. The slots include a temperature sensor accommodation slot which, at the insertion side, has a radial length greater than a radial length of any other one of the slots. The first hairpin conductor is disposed in the temperature sensor accommodation slot distal to the rotor accommodation space. The second hairpin conductor is disposed in the temperature sensor accommodation slot, and the temperature sensor is disposed between the first and second hairpin conductors.

Abstract: A vapor chamber with a support structure and its manufacturing method are provided. The vapor chamber with the support structure includes a first plate, a second plate spaced apart from the first plate, and multiple support elements fixed between the first and second plates. On an outer surface of any of the first plate or the second plate, laser welding is performed on positions corresponding to the support elements so as to join the support elements to the first and second plates and to form weld ports on the outer surface of any of the plates. The invention solves the problem of fixing the support structure inside the thin vapor chamber, and therefore mass production can be realized.

Abstract: The present application provides a power supply system for supplying power to network device, comprising power supply module, housing, and stereoscopic accommodating space therebetween. The power supply module without a fan comprises: a primary circuit comprising at least one primary switch and configured to receive AC input voltage and convert the AC input voltage into a first voltage; a transformer comprising primary and secondary windings and configured to convert the first voltage into a second voltage, the primary winding is coupled to the primary circuit; and a secondary circuit comprising at least one secondary switch and configured to convert the second voltage into a DC output voltage for the network device, the secondary circuit is coupled to the secondary winding, the secondary switch adopts SMT package, and power density of the power supply module is 60 W/inch3 or more. The stereoscopic accommodating space is filled with liquid coolant for cooling.

Abstract: The present application discloses a magnetic component, comprising a magnetic core comprising at least one core column; a winding winded on the core column and comprising a first coil and a second coil adjacent to the first coil; a cladding member covered on at least a portion of an external surface of the first coil; and a positioning member extending from the cladding member and the first coil, wherein the second coil is pressed on the positioning member.

Abstract: A power adapter includes a first output port, a second output port, a motherboard, a first flyback power module, a second flyback power module, a bus capacitor and an EMI module. The first flyback power module has a first circuit board and is electrically connected to the first output port. The second flyback power module has a second circuit board and is electrically connected to the second output port. The EMI module has a third circuit board and is arranged on the motherboard. The first circuit board and the second circuit board are arranged in parallel with each other, and are arranged substantially perpendicular to the motherboard on a first side of the motherboard.

Abstract: A voltage stabilizer is provided for stabilizing a gate-source voltage of a switching element, wherein a source of the switching element receives a first driving voltage. The voltage stabilizer includes a bipolar junction transistor, a first resistor and a second resistor. A base of the bipolar junction transistor receives a second driving voltage, a collector of the bipolar junction transistor is electrically connected to a gate of the switching element, a first terminal of the first resistor is electrically connected to the collector and the gate, a second terminal of the first resistor is electrically connected to the source of the switching element and receives the first driving voltage, a first terminal of the second resistor is electrically connected to an emitter of the bipolar junction transistor, and a second terminal of the second resistor receives a third driving voltage The bipolar junction transistor is operated in an active region.

Abstract: A high-density power supply includes a shell, a fan, a PFC module, a DC-DC module and a main board. The shell has a first air passage and a second air passage arranged side by side. The fan is arranged on an inner side or an outer side of the shell. The PFC module includes a PFC inductor arranged in the first air passage, and the PFC inductor faces directly to the fan. The DC-DC module is arranged in the first air passage. The DC-DC module includes at least one DC-DC conversion circuit, each of the DC-DC conversion circuits includes a first PCB and a transformer magnetic core, a transformer winding and power components arranged on the first PCB. The main board is arranged within the shell. The PFC inductor and the at least one DC-DC conversion circuit are electrically connected with the main board, respectively.