Abstract: 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.

Abstract: 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.

Abstract: A wireless charging device charging for an electronic device is disclosed. The wireless charging device includes a control unit, a sending coil coupled to the control unit, and a range sensor coupled to the control unit. The sending coil generates an induced magnetic field accepted by the electronic device. The range sensor senses a distance between a user and the wireless charging device, and further configured to determine if the sensed distance is greater than a preset distance. The sensed distance is greater than the preset distance, the control unit supplies power for the sending coil, and the sending coil generates the induced magnetic field. The sensed distance is smaller than a preset distance, the control unit stops to supply power for the sending coil, and the sending coil stops to generate the induced magnetic field.

Abstract: An electromagnetic shielding structure includes a bottom plate, a plurality of securing stands, and a circuit board. The circuit board is located among the plurality of securing stands and a shielding layer is laid on a top surface of the circuit board. The bottom plate, the plurality of securing stands, and the circuit board cooperatively define a closed space configured to receive an electronic part attached to a bottom surface of the circuit board, and the bottom plate, the plurality of securing stands and the circuit board are configured to shield electromagnetic of the electronic part.

Abstract: 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.

Abstract: 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.

Abstract: A fastening apparatus for fixing a circuit board includes a bracket. The bracket includes a main plate, two extending plates extending perpendicularly from opposite ends of the main plate, two fixing tabs extending perpendicularly from distal ends of the two extending plates, and two fastening tabs. The main plate and the two extending plates clamp the circuit board, and the two fastening tabs couple the circuit board to the bracket.

Abstract: 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.

Abstract: A mobile power source with keyboard includes a power source body configured to charge an electronic device and a keyboard mounted to the power source body. A cover is rotatably mounted to the power source body. The cover is exposed out of the keyboard when rotating open, thus the keyboard can input instruction to the electronic device. The cover covers the keyboard to protect the keyboard when rotating to be closed.

Abstract: 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.

Abstract: 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.

Abstract: A system for modeling current transmission on a printed circuit board (PCB), the system includes a layout information obtaining module, a power setting module, a calculating module and an analyzing module. The layout information obtaining module obtains layout information of the PCB. The power setting module sets output voltages of multiple voltage regulating modules and a variation range of the output voltages. The calculating module builds a current transmission model script of the PCB according to the settings, executes the current transmission model script, and calculates working voltages of the multiple receiving terminals. The analyzing module compares the working voltages of the multiple receiving terminals with voltages of the variation range of the output voltages, and determines whether the layout information of the PCB complies with the design specification.

Abstract: A detecting device includes an input device, a display, and a computer system. The computer system includes a setting module, a storing module, a detecting module, and a control module. The storing module stores a PCB layout file. The setting module receives detecting parameters inputted by the input device. The detecting module detects the PCB layout file according to the detecting parameters to obtain detecting data corresponding to the detecting parameters. The control module displays a “fail” message on the display if the detecting data does not match standard data.

Abstract: A wireless signal controlling circuit includes a control module, a wireless signal circuit, and a frequency-to-voltage converter connected to the wireless signal circuit. The control module includes a switch and a power supply. The power supply is connected to the frequency-to-voltage converter. The switch is used to control the power supply to supply a first voltage for the frequency-to-voltage converter. The frequency-to-voltage converter is used to change the first voltage to a second voltage for the wireless signal circuit.

Abstract: A testing system includes a layout information obtaining module, a first power pin sorting module, a transmission line sorting module, a power pin filtering module, a distance calculating module, a comparing module, and a report generating module. The layout information obtaining module obtains layout information. The first power pin sorting module sorts a power pin from a plurality of pins of a IC. The transmission line sorting module sorts transmission lines. The power pin filtering module filters power pins from a plurality of pins of capacities in same transmission line. The distance calculating module calculates distances between the power pin of the IC and each of the power pins of the capacities. The comparing module compares each of the distances with a threshold distance. The report generating module generates a testing report to depict whether or not the sorted power pins of the IC are qualified.

Abstract: A display device includes a top frame, a display, a printed circuit board, and a bottom frame. The top frame includes an anti-EMI cover panel and a securing portion extending from the anti-EMI cover panel. A receiving space is surrounded by the securing portion. The display is mounted in the top frame. The bottom frame includes a bottom panel and a mounting flange extending from the bottom panel. The printed circuit board is mounted on the bottom panel. The mounting flange is received in the receiving spaced and abuts an inner side of the securing portion. The anti-EMI cover panel, the securing portion, and the bottom frame cooperatively define an enclosed space for anti-EMI.

Abstract: 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.

Abstract: A printed circuit board assembly comprises a PCB and a shielding structure. The PCB comprises a top surface, a bottom surface, a first side surface, a second side surface, a third side surface, and a fourth side surface. A signal transmission line is laid in the top surface. The shielding structure is attached to the PCB and securely contacts the first side surface, the second side surface, the third side surface, and the fourth side surface. Edges of the top surface and the bottom surface are configured to shield EMI in the signal transmission line when transmitting high-speed differential signals.

Abstract: A printed circuit board includes a board body, a signal transmission line laid in the board body, and a metal bracket attached to the board body. The metal bracket tightly abuts side surfaces of the board body and shields electromagnetic interference of the signal transmission line when the signal transmission line transmits high-speed differential signals.

Abstract: An system for testing direct current (DC) layout of a printed circuit board, the system includes a layout information obtaining module, a rule loading module, a test script building module, a script executing module, and a report generating module. The layout information obtaining module obtains layout information of the printed circuit board. The rule loading module load DC transmission rules. The test script building module builds a DC transmission test scrip of the printed circuit board according to one of the DC transmission rules. The script executing module executes the DC transmission test script to determine whether the layout information of the printed circuit board complies with the one of the DC transmission rules. The report generating module generates a DC transmission testing report depicting whether the layout information of the printed circuit board complies with the one of the DC transmission rules and displays the testing report.