Hon Hai Precision Industry Co., Ltd.

Hong-Fu Jin Precision Industry (Shenzhen) Co., Ltd.

Hongfujin Precision Industry (Wuhan) Co., Ltd.

Scienbizip Consulting(shenzhen)co., Ltd.

Guang-Feng Ou

Yong-Zhao Huang

Yu-Hsu Lin

An electronic device includes a wireless module, a power supply, and a switch module. The wireless module is adapted to receive or send a wireless signal. The power supply is adapted to supply power for the wireless module. The switch module is connected between the wireless module and the power supply, and the switch module includes a first switch and a transistor. A collector terminal of the transistor is coupled to the power supply, the first switch is coupled to the collector terminal and the base terminal of the transistor, and an emitter terminal of the transistor is coupled to the wireless module. The transistor is switched on when the first switch is switched on, and the power supply supplies power for the wireless module. The transistor is switched off when the first switch is switched off, and the power supply is disconnected from the wireless module.

Electronic device for activating and deactivating wireless communication by a power supply switch configuration

A power supply system includes a charge module, a control module, and a discharge module. The charge module includes a charge circuit and a cell assembly. The control module includes a wireless unit. The discharge module includes a voltage increasing circuit coupled to the cell assembly and a voltage decreasing circuit coupled to the voltage increasing circuit. The charge module is coupled to a direct current power supply to charges the cell assembly. The cell assembly outputs a discharge voltage. The voltage increasing circuit is configured to increase the discharge voltage to a reference voltage. The voltage decreasing circuit decreases the increased discharge voltage to charge the wireless unit.

Power supply system for wireless keyboard

A keyboard for supporting an electronic device includes a keyboard body and an adjusting device. The keyboard body defines a receiving portion for receiving an electronic device, a first adjusting hole, and a second adjusting hole. The adjusting device includes a stopping plate received in the receiving portion, a first adjusting pole, and a second adjusting pole. The first adjusting pole extends out of the first adjusting hole to abut against the stopping plate. The second adjusting pole extends out of the second adjusting hole to abut against the stopping plate. An angle is defined between the first adjusting pole and the electronic device and the angle is adjustable based on the first adjusting pole and the second adjusting pole being mounted to a plurality of positions.

Keyboard for supporting electronic device

A testing system for testing a layout of a power pin of a chipset on a circuit board includes a layout information obtaining module, a power pin sorting module, a transmission line sorting module, a transmission line length calculating module, and a report generating module. The layout information obtaining module obtains layout information of the printed circuit board. The power pin sorting module sorts the power pin from a number of pins of the chipset. The transmission line sorting module sorts transmission lines that are connected to the power pin and are located on outer layers of the printed circuit board. The transmission line length calculating module calculates a total length of the transmission lines sorted by the transmission line sorting module and compares the total length with a threshold length. The report generating module generates a testing report indicating whether or not the power pin is qualified.

Computing device and method for testing layout of power pin of chipset on circuit board

A printed circuit board includes a power layer, a ground layer, a signal layer, and a backboard. The backboard is arranged below the signal layer opposite to the ground layer. A number of vias are formed from the backboard through the signal layer, and then connected to the ground layer.

Printed circuit board

A keyboard includes a keyboard main body and a supporting apparatus. A first extending portion is extended from a sidewall of the keyboard main body. A number of keys are set on a top of the keyboard main body. A second extending portion is extended from a sidewall of the supporting apparatus and mounted to the first extending portion. A supporting device is set on a top of the supporting apparatus, opposite to the second extending portion.

Keyboard

A computer includes a display assembly, a base, a stand, and a keyboard. The base includes a supporting board and an engaging board. The stand is located on the base supporting the display assembly. The keyboard includes a main body and an extension board extending from the main body. The main body has a key area. The extension board is fixed to the engaging board to help stabilize the display assembly.

Computer

A connecting device for connecting pins of a DIP chip to a test device comprises two each of half frames, columns of testing pins, connecting screws, fixing screws, and four holding plates. The two columns of testing pins are arranged respectively on the two half frames parallel to the lengthways direction of the half frame. The distance between two adjacent testing pins in the same column is equal to that between the two adjacent pins in the same column of the DIP chip. The two connecting screws screw into the half frames perpendicular to the lengthways direction of the half frame. Two of the holding plates extend down from each of the half frames and are aligned with short sides of the corresponding half frame. The fixing screws fix the two holding plates on the same half frame along a direction parallel to the lengthways direction of the half frame.

Connecting device

A printed circuit board includes a reference layer configured to connect to a power or a ground and a dielectric layer stacked on the reference layer. The dielectric layer includes a component surface opposing the reference layer. The component surface forms a differential pairs, a protection runner, and a power runner. The differential pairs include a substantially linear part. The protection runner is intervened between the linear part and the power runner, and is substantially parallel to the differential pairs. The length of the protection runner is approximately equal to that of the linear part. Each of the two ends of the protection runner forms a via that electrically connects the protection runner to the reference layer.

A low pass filter circuit includes an inductor and a capacitor. A first terminal of the inductor functions as an input to receive direct current voltage, and a second terminal of the inductor is connected to a first terminal of the capacitor through first and second conductor traces connected in series. A second terminal of the capacitor is grounded. Widths of the first and second conductor traces both range from about 2 mils to about 5 mils. A node between the first and second conductor traces outputs the direct current.

A method for building a magnetic bead mathematical model includes defining component elements of the model of the magnetic bead, building the model of the magnetic bead, obtaining a characteristic curve of an impedance of a magnetic bead in a standard magnetic bead specification of the magnetic bead, ascertaining parameters of the component elements, simulating the model of the magnetic bead, and comparing the characteristic curve with the characteristic curve in the standard magnetic bead specification, to further optimize the mode of the magnetic bead.

Method for building magnetic bead mathematical model

A circuit for controlling a rotation speed of a computer fan includes a control chip, a conversion circuit, a fan header, a first switch, and a second switch. When a first terminal of the first switch is connected to a second terminal of the first switch, and a first terminal of the second switch is connected to a second terminal of the second switch, the conversion circuit converts a control signal received from the control chip to a voltage signal, and outputs the voltage signal to a power pin of the fan header. When the first terminal of the first switch is connected to a third terminal of the first switch, and the first terminal of the second switch is connected to a third terminal of the second switch, a control pin of the fan header receives the control signal, the power pin receives power from a first power supply.

Circuit for controlling rotation speed of computer fan

An impedance matching device for memory signals includes a resistor array and a switch device. A number of first pins at a first side of the resistor array are connected to control signal pins and/or address signal pins of a memory socket on a motherboard. A number of second pins are extended at a second side of the resistor array. The switch device connects or disconnects the plurality of second pins of the resistor array to or from a power supply on the motherboard.

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Shenzhen, China

Guang-Feng Ou