Abstract: An electric connector assembly includes a socket and a plug. The socket has a first casing, a base and a first pin assembly. The first pin assembly has a plurality of ground terminals and signal terminals. Each ground terminal has a specific height, and has a first coupling portion disposed on a first end. The plug has a second casing, a receiving base and a second pin assembly. The second pin assembly has a plurality of connecting terminals. Each connecting terminal has a second coupling portion disposed on a second end. When the plug is coupling with the socket, the connecting terminals of the plug respectively clamp the ground terminals and the signal terminals of the socket, and the second coupling portions of the connecting terminals are respectively engaged with the first coupling portions of the ground terminals to increase contact areas.

Abstract: A motor includes a rotor and a stator. The rotor comprises a rotating shaft and an impeller. The impeller couples with the rotating shaft and has a hub. The hub has an outer surface, an inner surface, a plurality of first through holes and a plurality of second through holes. The first through holes are disposed nearer the rotating shaft than the second through holes. The stator comprises a silicon steel sheet and a bearing assembly. The silicon steel sheet has an annular portion and a plurality of protruding portions. The rotating shaft couples with the bearing assembly and penetrates within an inner hole of the annular portion. Each protruding portion is extended outward from the annular portion and has an extending length. The distance between the first through hole and the nearest second through hole is in a range of 0.3 to 1.2 times of the extending length.

Abstract: A switch short-circuited diagnosis method includes steps of: determining an initial voltage interval of multiple voltage intervals according to voltage relationships between voltages of a first phase wire, a second phase wire, and a third phase wire; performing a switch short-circuited diagnosis of a first bidirectional switch module in the three consecutive voltage intervals from the initial voltage interval, and including steps of: turning on a first switch branch, a second switch branch, or a third switch branch of the first bidirectional switch module according to the voltage relationships between the voltages of the first, second and third phase wires, determining whether an overcurrent occurs to diagnose whether the first switch branch, the second switch branch, or the third switch branch of the first bidirectional switch module is in a short-circuited state, and performing the switch short-circuited diagnosis for the next voltage interval.

Abstract: A ceiling fan includes an outer shield, a middle ring, a blade bracket, and a fan blade. The middle ring is pivotally connected to the outer shield and rotates relative to the outer shield. The blade bracket protrudes from the middle ring and has two guiding surfaces located on opposite sides of the blade bracket. The fan blade is combined with the middle ring by the blade bracket. The fan blade has an opening on an end close to the blade bracket. The fan blade further includes a housing, one or more supporting ribs, and two guiding limiting parts.

Abstract: A laser soldering system using dynamic light spot and a method thereof are provided. A laser module is controlled to radiate toward multi-lens to form a light spot on a soldering target for soldering, and a lens distance between the multi-lens is adjusted to adjust a light spot size. The disclosure may provide multiple heating densities respectively adequate to different soldering status via adjusting the light spot size when using same laser power, so as to improve the soldering quality.

Abstract: The present disclosure provides an assembly structure for providing power for a chip and the assembly includes: a board; a chip, provided with at least one electrical energy input terminal; and a first power converting module, provided with at least one power output terminal, wherein the first power converting module is electrically connected to the chip, converts a first electrical energy to a second electrical energy, and supplies the second electrical energy through the at least one power output terminal to the at least one electrical energy input terminal of the chip, and a back plate; wherein the back plate and the chip are provided at two opposite sides of the board; wherein the board, the chip and the first power converting module are stacked and the first power converting module is at least partially inserted in the back plate.

Abstract: A heat dissipation assembly is disclosed and includes a frame and a fan. The frame includes a heat conduction channel and an airflow intake. The heat conduction channel is communication with an exterior through airflow intake. The frame includes a first plane, a second plane and an inclined plane. The first plane is disposed adjacent to the airflow intake. The inclined plane is connected between the first plane and the second plane. The second plane includes an inlet. The heat conduction channel is in communication between the airflow intake and the inlet. A cross-section area of the heat conduction channel adjacent to the airflow intake is greater than that of the heat conduction channel adjacent to the inlet. The fan is spatially corresponding to the inlet, and assembled with the frame to form an outlet in communication with the airflow intake and the heat conduction channel through the inlet.

Abstract: The present disclosure provides a power control system for motor preheating including a current sensor, a power calculation module, a power error calculation module, a power control module, a current control module and a voltage control module. The current sensor senses a motor current output by the motor. The power calculation module calculates an output power of the motor according to the voltage command and the motor current. The power error calculation module calculates a power error according to a power command and the output power. The power control module outputs a current braking command according to the power error. The current control module calculates a voltage command according to the current braking command and the motor current. The voltage control module outputs a three-phase voltage according to the voltage command, and the motor is operated in a stationary state, and the stator of the motor is preheated.

Abstract: An isolated DC-DC converter is provided. The isolated DC-DC converter includes a full-bridge switching stage, a resonant network, a transformer, an output stage, an isolated charge sensor and a switch controller. The full-bridge switching stage has at least four active switches. The resonant network has a plurality of inductors and plurality of capacitors. The transformer is connected to the resonant network. The output stage is connected to the transformer and is configured to generate an output voltage or current. The isolated charge sensor is connected to the resonant network to generate a resonant inductor current charge signal. The switch controller generates and provides control signals to the at least four active switches based on at least the resonant inductor current charge signal and the output voltage or current.

Abstract: A method of obtaining a parameter of a synchronous motor is disclosed and includes: setting an operating current of the motor; providing a positive fixed voltage to the motor and monitoring a feedback current from the motor; recording a triggering time for the feedback current to reach the operating current; providing a negative fixed voltage to the motor for the triggering time; obtaining a square-wave voltage with a fixed frequency based on the positive fixed voltage and the negative fixed voltage being provided; providing the square-wave voltage with the fixed frequency to one axis of the motor; transforming three-phase current from the motor into an axial current; computing an inductance value of this axis based on the fixed frequency, the square-wave voltage and the axial current; and, creating an inductance-current parameter table based on a plurality of the inductance values and the axial currents correspondingly.

Abstract: A three-dimensional measuring device includes a ball-shaped structure, an X-axis measuring module, a Y-axis measuring module and a Z-axis measuring module. The ball-shaped structure is moved and/or rotated in response to a movement of a movable object. The X-axis measuring module includes a first measuring structure and a first position sensor. The first measuring structure is movable along an X-axis direction and contacted with the ball-shaped structure. The Y-axis measuring module includes a second measuring structure and a second position sensor. The second measuring structure is movable along a Y-axis direction and contacted with the ball-shaped structure. The Z-axis measuring module includes a third measuring structure and a third position sensor. The third measuring structure is movable along a Z-axis direction and contacted with the ball-shaped structure.

Abstract: A dual mode charge control method includes steps of: detecting an input voltage of the resonance tank, a resonance current of the resonance tank, an output current of the load, and an output voltage of the load; performing a single-band charge control when determining a light-load condition or a no-load condition of the load according to the output current; compensating the output voltage to generate an upper threshold voltage in the single-band charge control, and acquiring a resonance voltage by calculating the resonance current by a resettable integrator; comparing the resonance voltage and the upper threshold voltage to generate a first control signal; generating a second control signal complementary to the first control signal by a pulse-width modulation duplicator; providing the first control signal and the second control signal to respectively control a first power switch and a second power switch of the resonance circuit.

Abstract: The present disclosure provides a high voltage device built from modular low voltage cells. Each low voltage cell includes a plurality of low voltage semiconductor devices and one or more low voltage passive components. Each cell can be a current-bidirectional two-quadrant switch or a four-quadrant switch. All the cells may be identical and controlled with a delay time in between. Therefore, the total on and off time of the high voltage device can be controlled to reduce the output equivalent dv/dt. The cell's voltage balancing can be achieved through a control algorithm disclosed herein.

Abstract: A heat pipe comprises a flat tube and a wick structure. The flat tube includes a hollow chamber and has a front and a rear sealed ends along an axial direction. The wick structure is disposed in the hollow chamber and extended along the axial direction of the flat tube. The wick structure is divided into a front, a middle and a rear sections sequentially along the axial direction. The front section is near the front sealed end, the rear section is near the rear sealed end. The front, middle and rear sections have a maximum length parallel to the width direction, respectively. The maximum length of the front section is greater than that of the middle section, and the maximum length of the middle section is greater than that of the rear section.

Abstract: Disclosed herein is a power supply apparatus. The power supply apparatus includes at least one power unit and a magnetic unit. The magnetic unit is stacked with and electrically connected to the at least one power unit. The magnetic unit comprises a plurality of pins and a magnetic core. The at least part of the plurality of pins extends out of a projection of the magnetic core in a connection plane of the at least one power unit and the magnetic unit to connect to the at least one power unit.

Abstract: An immersion cooling system includes a cooling tank, a housing and a valve. The coolant tank is configured to accommodate a liquid coolant and an electronic device immersed in the liquid coolant. The housing covers a side of the cooling tank and thereby forms an enclosure. The valve has two ports, one of which communicates with the enclosure and the other communicates with a part of the cooling tank above the liquid coolant. The valve is configured to open in response to a gas pressure inside the cooling tank exceeding an upper limit.

Abstract: A cable strain relief structure includes a conducting seat, a cable, a supporting element, and an insulating sleeve. The conducting seat includes an insulating body and a conducting element disposed in the insulating body. The cable passes through the insulating body and is electrically connected to the conducting element. The supporting element includes a plurality of ridges arranged spacedly and annularly on the outer periphery of the cable. The ridges are extended in the direction along the cable and away from the insulating body. The insulating sleeve covers the supporting element and is extended in the direction along the cable.

Abstract: A stator structure includes a silicon steel sheet, a first plastic material and a second plastic material. The silicon steel sheet has a plurality of pole faces. The first plastic material covers on the silicon steel sheet. The second plastic material forming on the first plastic material. The first plastic material covered on the plurality of the pole faces is not covered by the second plastic material. The thermal conductivity of the first plastic material is higher than that of the second plastic material.