Abstract: A power supply circuit includes a power controller and a switch. The power controller is connected to a Southbridge chip of a motherboard. The Southbridge chip outputs status signals of the motherboard. The power controller provides a +5V_SYS voltage or a +5V_SB voltage to a universal serial bus (USB) connector according to the status signals. The switch is connected to the USB connector, a USB controller, and the Southbridge chip. The switch connects or disconnects from the USB connector and the USB controller according to the status signals.

Abstract: An exemplary computer case includes an external shell, a circuit board received in the external shell, and a dehumidification device. The circuit board includes a PCI socket providing an auxiliary power supply when the computer shuts down but the computer case retains electrical connection with an external AC power source. The dehumidification device includes a dehumidification card received in the PCI socket for obtaining the auxiliary power supply therefrom and a remote device. The dehumidification card includes a fan for generating airflow to remove moisture from the computer case and a sensor detecting a humidity inside the computer case. The remote device includes a display unit for displaying the result. When the humidity exceeds a predetermined value, the computer is not powered up until the fan evacuates the excess moisture from the computer case and the humidity falls below the predetermined value.

Abstract: An LED lamp includes a heat sink including a base having a heat-dissipating face, an LED module including a printed circuit board mounted on the base and a plurality of LEDs disposed on the printed circuit board, and a connecter electrically connecting the LED module to a power supply. The heat sink further includes a plurality of spiral fins protruding outwardly from the heat-dissipating face of the base.

Abstract: A method for booting up a mobile phone quickly is disclosed. The method includes the steps of: driving hardware devices when the mobile phone is turned on; initializing application software installed in the mobile phone; loading data in the mobile phone from a storage to a memory; creating a table for each kind of data in the memory, and ordering data in each table according to a particular order condition; converting each table into a binary file, and storing the binary file in the storage; loading the binary file of each table directly from the storage to the memory when the mobile phone is turned on. A related quickly booting mobile phone is also disclosed.

Abstract: A charging device for charging a portable electronic device includes a voltage regulating unit and a charger body electrically connected to the voltage regulating unit. The voltage regulating unit is configured for receiving electric energy from an external power source and converting the external power into a stable power. The charger body receives the stable voltage and transfers the electric energy to the portable electronic device via inductive coupling to charge the portable electronic device.

Abstract: A heat dissipating device includes a heat dissipating element and a bracket. The bracket includes a first fixing portion and a second fixing portion. The first fixing portion is to fix the heating dissipating element. The second fixing portion is movably mounted to the first fixing portion. The second fixing portion is configured to fix the bracket to another apparatus to adjust a distance between the heat dissipating element and the apparatus.

Abstract: A limiting structure is used for a foldable electronic device including a cover and a body. The limiting structure includes a receiving portion formed in the cover, a latching element, a support element and an elastic element. The receiving portion defines a notch and a holding portion. The latching element is fixed to the body. The support element defines a cutout. The cutout is aligned with the notch. The latching element is received in the cutout and the notch. The elastic element surrounds the support element. The cover is opened relative to the body, and the latching element is latched with the holding portion.

Abstract: A process for joining a stainless steel part and a silicon carbide ceramic part comprising: providing a SUS part, a SiC ceramic part, a Mo foil and a Ti foil; placing the SiC ceramic part, the Mo foil, the Ti foil, and the SUS part into a mold, the Mo foil and the Ti foil located between the SiC ceramic part and the SUS part, the Mo foil abutting the SiC ceramic part, the Ti foil abutting the SUS part and the Mo foil; placing the mold into a chamber of an hot press sintering device, heating the chamber and pressing the SUS part, the SiC ceramic part, the Mo foil, and the Ti foil at least until the SUS part, the SiC ceramic part, the Mo foil and the Ti foil form a integral composite article.

Abstract: A portable sound box includes a main body and a clip. The main body includes a battery for supplying power to the portable sound box. Thus, the portable sound box can supply power on its own. The clip is fixed to the main body and configured for clipping to an external object. Thus, the portable sound box can attached to the external object instead of standing on a surface.

Abstract: A power supply circuit includes an energy-consuming component including an input terminal, an input over-voltage protection circuit connected to the input terminal, and a feed back circuit. The feedback circuit is connected to the input over-voltage protection circuit and the input terminal of the energy-consuming component. The feedback circuit monitors the voltage on the input terminal, compares the voltage on the input terminal with a reference voltage, and turns off the input over-voltage protection circuit to cut off voltage provided to the input terminal of the energy-consuming component when the voltage on the input terminal is larger than the reference voltage.

Abstract: The portable computer includes a PCIe controller, a DisplayPort connector, and a combination switch. The DisplayPort connector includes a hot plug pin. The combination switch is connected between the PCIe controller and the DisplayPort connector. The combination switch includes a selecting pin electronically connected to the hot plug pin. When the DisplayPort connector is electronically coupled to a discrete graphics card using PCIe, the hot plug pin sends a hot plug voltage signal to the selecting pin, and the combination switch electronically connects the DisplayPort connector to the PCIe controller after receiving the signal.

Abstract: A keyboard includes a main body and a support in the main body. The main body includes a bottom defining two slots and two opposite sidewalls each defining a receiving hole. The slots communicate with the receiving holes, respectively. The support includes a rotation member, two driving members and two connecting members received in the two slots, respectively. Each connecting member includes a first arm and a second arm, wherein two ends of the first arm are rotatably connected to the rotation member and the second arm, respectively, the second arm is further rotatably connected to one of the driving members, and the second arm moves together with the one of the two driving members, causing the connecting ends of the first arm and the second arm to extend out of one of the two slots.

Abstract: A heat dissipation device includes a canister filled with a phase-changeable working fluid, a housing hermetically fixed to a top of the canister and communicating with the canister, a fan located above a top of the housing and an impeller comprising a driving member received in the housing, an annular magnet accommodated in the hub and an axle coaxially connecting the driving member and the annular magnet together. The fan includes a plurality of windings fixed on an inner side thereof. When the working fluid is heated and vaporized to move through the driving member, the driving member is driven by the vaporized working fluid to rotate, whereby the annular magnet rotates within the windings to cause the windings to generate a current.

Abstract: A fastening assembly includes a connecting member, a mounting member mounted to the connecting member, and a sliding member. The mounting member includes a first fixing portion. The sliding member is slidably received in the mounting member and the connecting member. The sliding member includes a first end exposed out of the first fixing portion, and a second end slidably received in the connecting member. The second end of the sliding member is operable to be extended out of or substantially coplanar with an end of the connecting member. The fastening assembly can be utilized to mount a heat sink to a board.

Abstract: A gallium nitride-based semiconductor device includes a composite substrate and a gallium nitride layer. The composite substrate includes a silicon substrate and a filler. The silicon substrate includes a first surface and a second surface opposite to the first surface, and the first surface defines a number of grooves therein. The filler is filled into the number of grooves on the first surface of the silicon substrate. A thermal expansion coefficient of the filler is bigger than that of the silicon substrate. The gallium nitride layer is formed on the second surface of the silicon substrate.

Abstract: An exemplary lens barrel includes a hollow main body. The hollow main body includes a first end at an object side, and an opposite second end at an image side. The hollow main body also including a cylindrical inner surface adjacent to the first end, a partially conical inner surface adjacent to the second end, and a ring-shaped groove located between the cylindrical inner surface and the partially conical inner surface. The partially conical inner surface faces toward the first end. A cone angle of the partially conical inner surface is in a range from 8 degrees to 16 degrees.

Abstract: An exemplary light emitting diode includes a light emitting diode chip, two optical wavelength converting layers, and an encapsulant layer. The light emitting diode chip has an light emitting surface. The light emitting diode chip is used to emit a monochromatic light from the light emitting surface. The light emitting surface includes a first region, a second region, and a third region. The two optical wavelength converting layers covers the first and the third regions of the light emitting surface. The two optical wavelength converting layers are configured for converting the monochromatic light received from the light emitting diode chip and emitting light with a converted wavelength from the light emitting diode. The encapsulant layer covers the second region of the light emitting surface for directing light therefrom.

Abstract: A centrifugal fan includes an impeller and a housing receiving the impeller therein. The impeller includes a hub and blades extending radially from the hub. The housing includes a bottom wall, a sidewall extending upwardly from the bottom wall and a bracket for supporting the impeller thereon. The bottom wall defines an air inlet therein. A plurality of protruding posts extend downwardly from a bottom surface of the bottom wall around the air inlet. Each of the protruding posts defines a screw hole therein. The bracket is located in the air inlet. The bracket defines a plurality of through holes corresponding to the protruding posts respectively. The protruding posts of the bottom wall are respectively inserted into the through holes of the bracket. A plurality of bolts are respectively screwed into the screw holes of the protruding posts to connect the bracket and the bottom wall together.

Abstract: A testing method includes following steps. An electronic image is captured by an electronic device. A test device detect whether the image has any black bar. If the image has a black bar, pixel values in the black bar are extracted. If the pixel values in the black bar are all the same, a test result of imaging software error is presented. If the pixel values in the black bar are different from each other, a test result of mechanism error is presented. A test system associated with the testing method is also disclosed.