Abstract: A fan simulation circuit includes a connector, a voltage converter, a control chip, and a selecting module. The connector is used to output a speed signal. A power pin of the voltage converter is connected to a first voltage input terminal An output pin of the voltage converter is connected to a speed pin of the connector through a first resistor. The output pin is also connected to a second voltage input terminal through the first resistor and a second resistor in that order. The selecting module is used to output high or low-level signals to the control chip. The control chip outputs different speed signals to an input pin of the voltage converter. The voltage converter converts the speed signals and outputs converted speed signals to the speed pin of the connector.

Abstract: A control circuit for a terminal electronic device includes a network card, a wakeup circuit, a south bridge, a restart circuit, and a controller. The network card receives a remote control command from a remote apparatus, and generates a wakeup signal if the terminal electronic device is turned off. The wakeup circuit activates the terminal electronic device according to the wakeup signal. The south bridge provides a low voltage power signal if the terminal electronic device is turned off. The controller receives the wakeup signal and the low voltage power signal, and outputs a first control signal to the restart circuit to disable the restart circuit.

Abstract: A device and method for reducing current ripple to a light emitting diode array having a single stage power factor correction driver with an output voltage ripple that is reduced by using a linear current regulator connected in series between the single stage power factor correction driver and the light emitting diode array, which actively adjusts an equivalent impedance of the linear current regulator in correspondence with the output voltage ripple of the single stage power factor correction driver.

Abstract: An auxiliary member for pavement construction, including: a cylinder, a base plate and a leveling bolt; the cylinder includes a first cylinder part and a second cylinder part which are connected and communicated with each other, the first cylinder part is provided with a sling installing member and a slurry inlet, bottom of the second cylinder part is connected with the base plate, the base plate is provided with a bolt extending hole and multiple slurry discharging holes which are communicated with the inner cavity of the second cylinder part, the leveling bolt includes a bolt head and a screw, the screw extends through the bolt extending hole, the bolt head is arranged in the second cylinder part and the bolt head is smaller than the inner diameter of the second cylinder part. The present invention further provides a concrete slab and a method for pavement construction.

Abstract: A hard disk drive module comprises a hard disk drive, a bracket, a hard disk drive backplane, and a temperature detecting circuit. The bracket supports the hard disk drive. The hard disk drive backplane is electrically connected to the hard disk drive. The temperature detecting circuit comprises a temperature detecting chip arranged on the bracket, and a cable connected between the temperature detecting chip and the hard disk drive backplane.

Abstract: A power management circuit includes a system connector, first and second power connectors, and a control chip. The system connector is used to connect a main server of a server system. The first power connector is used to connect a first power source and the second power connector is used to connect a second power source. The control chip is coupled to the system connector, the first power connector, and the second power connector. The control chip converts signals from the main server into control signals to the first and second power sources. The control chip processes signals from the first and second power sources and outputs the processed signals to the main server.

Abstract: A protection circuit is coupled between a power supply unit and a device. The protection circuit includes a delay circuit, a power circuit, a switch circuit, and a determining circuit. The power supply unit supplies power to the device through the power circuit when the device works normally. The delay circuit receives a power good signal and outputs the power good signal after a preset period of time to the switch circuit. The switch circuit energizes the determining circuit when the switch circuit receives the power good signal. The determining circuit outputs a control signal to the power circuit to disconnect the power supply unit from the device when the device is short-circuited.

Abstract: A fan with a protection circuit includes a connector, a fan operation circuit, and a protection circuit. The protection circuit includes a first resistor, a controller, and an electronic switch. The controller controls the electronic switch to be turned off when a current flowing through the first resistor is greater than a preset current. The controller controls the electronic switch to be turned on when the current flowing through the first resistor is less than the preset current, then the fan resumes normal working.

Abstract: A power supply circuit includes a connector, a first power supply module, and a second power supply module. The first power supply module is connected to, and supplies power to, the connector. The second power supply module is connected to the connector and the first power supply module. The first power supply module stops supplying power to the connector and outputs a control signal to the second power supply module when a current flowing through the first power supply module exceeds a certain limit. The second power supply module supplies power to the connector when the second power supply module receives the control signal.

Abstract: A system and method that transmits multimedia content over a long distance through network for prompt display of the transmitted multimedia content, wherein multimedia content are encoded into streaming format data files that enables smooth transmission and continuous display of multimedia content, said streaming format reflects inherent temporal characteristic of multimedia content, said streaming data files are arranged in a way that allows access and retrieval through hypertext transfer protocol, or HTTP, and the transmission of multimedia content is regulated in a way that adapts to the inherent characteristics and/or real-time traffic condition of the network or display progress.

Abstract: An expansion card assembly includes a first expansion card with a first circuit board, a first expansion slot, and a second expansion card with a second circuit board. A first edge connector is arranged on a bottom edge of the first circuit board and is inserted into a second expansion slot of a motherboard. A second edge connector is arranged on a top edge of the first circuit board and is inserted into the first expansion slot. A third edge connector is arranged on a bottom edge of the second circuit board and is electrically connected to pins of the first expansion slot opposite to the first expansion card.

Abstract: A protecting circuit for a basic input output system (BIOS) chip of a computer includes a platform controller hub (PCH), an inverting circuit connected to the PCH, a BIOS socket to connect the BIOS chip, and a controlling circuit connected between the inverting circuit and the BIOS socket. The PCH outputs a first signal or a second signal, and a third signal. The inverting circuit outputs an inverted signal with a level contrary to the first or second signal. The controlling circuit receives the first or second signal and the inverted signal, to output a processing signal to the BIOS socket, thereby controlling write-protection states of the BIOS chip.

Abstract: Protection device includes a group of lines, a protection board, and a connector. The group of the lines includes a first line and a second line. The first line is a ground wire and the second line is a power wire. The protection board includes a number of protection members. The connector includes a first connector port and a second connector port. The first line is directly connected to the first connector port, and the corresponding second line is connected to the corresponding second connector port through the protection board.

Abstract: A server backplane includes a circuit board, a first connector, a second connector, a power connector, a plurality of hard disk drive interfaces to be coupled to HDDs, a HDD controller interface, and a controller coupled to the plurality of HDD interfaces and the HDD controller interface. The controller can detect the respective statuses of all the HDD according to report signals from the HDD controller interface and status signals from the HDD interfaces.

Abstract: A power circuit for different types of fans includes first through sixth terminals, a control chip, first through third loads, and a connector. If a 3-pin fan is connected to the connector, only the first load connects the first and second terminals, and a control pin of the connector is idle. If a 4-pin fan is connected to the connector, the second load connects the third and fourth terminals, the third load connects the fifth and sixth terminals, and the first load does not connect the first and second terminals. The control pin receives a divided voltage to control fan speed.

Abstract: A port indicating circuit for a hard disk backplane of a server system includes a port circuit and an indicating circuit. The port circuit includes a control microchip and at least one selecting microchip. The hard disk backplane includes a number of ports. The server system includes a number of servers connected to some of the ports. The selecting microchip is connected to the control microchip and the remaining ports. If the control microchip detects that one or more standby servers form part of the server system, the control microchip selects the one or more standby server to connect to the remaining ports. If the control microchip does not detect that the one or more standby servers form part of the server system, the control microchip selects the servers to connect to the remaining ports. The indicating circuit indicates operating status of hard disks on the hard disk backplane.

Abstract: A motherboard includes a first connector, a first signal module, a second signal module, a power module, and a switch module. The first connector is used to couple external devices to the motherboard. The first signal module and the second signal module are compatible for external devices under different interface standards. The first signal module outputs different signals to control the switch module corresponding to the external device. The switch module connects the first signal module or the second signal module to the first connector corresponding to the control signals received from the control module.

Abstract: A signal transmission device includes a driver chip and a receiver. The driver chip is connected to a signal source to receive a first signal. The driver chip compensates the first signal into a second signal according to a preset coefficient. The driver chip outputs the second signal to the receiver.

Abstract: A fan testing device connects to the fan and a motherboard. The fan testing device includes a first connection module, a second connection module, a control chip, and an alarm module. The control chip is coupled to signal pins of the first and second connectors. The control chip outputs different signals to control the alarm module according to the connections of the first and second connection modules.

Abstract: A fan test device to connect a motherboard and a fan includes a control chip, a first connector, a second connector, a first switch chip, a second switch chip, a first electronic switch, and a second electronic switch. The control chip is connected to sensing pins of the first and second connectors. The first electronic switch is connected between a power terminal and a power pin of the first connector. The second electronic switch is connected between the power terminal and a power pin of the second connector. The control chip outputs different signals corresponding to the connection of the first and second connectors to control the first and second switch chips.