Abstract: A power supply circuit for powering first and second groups of hard disk drives in a cabinet, includes a connector and first to third connection units. When there is only one server in the cabinet, the first node is connected to the first power terminal of the connector, the first connection unit is turned on, and the second connection unit is turned off. When there are two servers in the cabinet, the first and second nodes are respectively connected to the first and second power terminals of the connector, the first connection unit is turned on, and the second and third connection units are turned off.

Abstract: A mounting device for mounting a number of fans includes a rack and a number of fixing members. The rack includes a bottom wall and two sidewalls perpendicularly extending up from opposite sides of the rack. Each sidewall defines a number of vents spaced along the lengthwise of the sidewall. Each fixing member includes a board perpendicularly mounted to the bottom wall and positioned at a side of two aligning vents, and a blocking member mounted to the board and slidable along the lengthwise of the sidewalls to block a top of a fan.

Abstract: A motherboard assembly includes a motherboard and an expansion card. The motherboard includes an expansion slot, a storage device interface, a power connector, and a central processing unit (CPU). The expansion slot includes a protrusion, first signal pins connected to the CPU, first power pins connected to the power connector. The expansion card includes a circuit board. A storage unit, a display unit, a power circuit, and a serial advanced technology attachment (SATA) connector connected to the storage unit and the storage device interface of the motherboard are all arranged on the circuit board. A notch is defined in a bottom edge of the circuit board, to receive the protrusion. An edge connector is arranged on a bottom edge of the circuit board and includes second power pins connected to the power circuit, and second signal pins connected to the display unit.

Abstract: A fan controlling system of an electronic device connects a fan to an external power source when the electronic device operates. The fan controlling system switches the fan to connect to a backup power source of the electronic device when the electronic device is turned off.

Abstract: A power supply includes a shell. The shell includes a power module to convert alternating current power into direct current power. The power module includes a control unit. The shell defines a rectangular slot to accommodate either a battery or fans. When the rectangular slot accommodates a battery, the battery is electrically connected to the control unit, and the control unit charges the battery. The battery supplies power for a nonvolatile memory. When the rectangular slot accommodates fans, the fans are electrically connected to the power module.

Abstract: An apparatus for mounting an expansion card module to a motherboard having a number of sockets includes a supporting frame and a fixing bracket slidably mounted to the supporting frame and fixed to an end of the expansion card module. The expansion card module can be inserted into any one of the card slots, with the fixing bracket able to slide along the supporting frame, to any desired position, before fixing the expansion card module in place.

Abstract: A power supply circuit for powering first and second groups of hard disk drives in a cabinet, includes a connector and first to third connection units. When there is only one server in the cabinet, the first node is connected to the first power terminal of the connector, the first connection unit is turned on, and the second connection unit is turned off. When there are two servers in the cabinet, the first and second nodes are respectively connected to the first and second power terminals of the connector, the first connection unit is turned on, and the second and third connection units are turned off.

Abstract: An electronic device includes a chassis, a motherboard received in the chassis, a receiving portion installed in the chassis, a casing received in the receiving portion, and a printed circuit board (PCB) installed in the casing. Two openings are defined in two opposite ends of the receiving portion. One of the openings extends through an end wall of the chassis, and the other opening aligns with a connector mounted to the motherboard. The PCB includes a first connector connected to the connector of the motherboard, and a second connector connected to a connector of a portable device received in the casing.

Abstract: A power supply management system includes a number of motherboards, a number of power supply units (PSUs), a number of sampling units, and a processor. Each sampling unit is being coupled between a motherboard and a PSU, and outputting a signal as to a normal or abnormal power supply. Thus in the event of a PSU malfunction, the processor identifies the motherboard which is consuming the greatest amount of power, and outputs an alarm to the identified motherboard to reduce the level of power being consumed by that motherboard.

Abstract: A power management system includes a number of motherboards, a power supply unit, a number of first electronic switches coupled to the motherboards respectively, and a processor. The power supply unit includes first and second power units. First terminals of the first electronic switches are coupled to the second power unit, second terminals of the first electronic switches are coupled to the corresponding motherboards, and third terminals of the first electronic switches are coupled to the processor. The processor obtains statuses of the motherboards to determine whether there exists at least one of the motherboards needing to bootstrap, the processor outputs a switch signal to the third terminal of the electronic switch coupled to the motherboard that needs to bootstrap, in response to there existing at least one of the motherboards needing to bootstrap.

Abstract: A management system includes two motherboards assigned with different identities, a complex programmable logic device (CPLD), and a switch unit. Each motherboard includes a baseboard management controller (BMC) employed to receive a control signal from a client. The BMC outputs an operation signal corresponding to the control signal and an identity of the motherboard. The CPLD is configured to store the control signal and the identity as a record in a priority list, and determine whether the priority list is a void list. The CPLD outputs a switch signal according to the identity of the record obtained from the priority list in response to the priority list not being a void list. The switch unit is configured to receive the switch signal from the CPLD, and enable a power supply unit to power the corresponding motherboard.

Abstract: A protection circuit includes a switch circuit, a sample circuit, a comparison circuit, and a relay circuit. The switch circuit is connected between a hard disk power supply and a hard disk to control whether to output power from the hard disk power supply to the hard disk. The sample circuit samples the voltage being supplied to the hard disk, the comparison circuit receives the sampled voltage, compares the sampled voltage to a reference voltage, and controls the switch circuit to be turned on or off accordingly. The relay circuit is connected between a system power supply and an enable terminal of the comparison circuit. The relay circuit outputs a high level signal to turn on the switch circuit when the system power supply is being supplied and the hard disk power supply is not being supplied to the hard disk.

Abstract: An electronic device includes a circuit board with a number of expansion slots arranged on the circuit board for connecting a number of expansion cards, and a guiding member inserted in one idle expansion slot of the expansion slots for guiding airflow to the expansion cards at opposite sides of the idle expansion slot.

Abstract: An electronic device includes a main board and a heat dissipation device, and the heat dissipation device includes a plurality of fans and a micro control unit (MCU). The main board and the plurality of fans are electrically connected to the MCU. The MCU controls the plurality of fans to rotate, and each of the plurality of fans sends a feedback signal to the MCU as long as it is working normally. When a feedback signals from at least one of the plurality of fans in not received, the MCU applies a soft power-off to the main board after storing current data of the electronic device.

Abstract: A server system includes at least one server unit, a power unit, and a control unit. The control unit includes at least one device module, a storage module, and a power module. The power module receives power information of the power unit in real-time, and the storage module stores the power information. All of the at least one server unit can simultaneously read the power information from the storage module through the at least one device module.

Abstract: A motherboard assembly includes a motherboard and an expansion card. The motherboard includes an expansion slot, a hard disk drive (HDD) controller, a power connector, and a central processing unit (CPU). The expansion slot includes a protrusion, idle pins connected to the HDD controller, power pins connected to the power connector, signal pins connected to the CPU. The expansion card includes a circuit board. A storage unit, a display unit, and a power circuit connected to the storage unit and the display unit are all arranged on the circuit board. A notch is defined in a bottom side of the circuit board, to receive the protrusion. An edge connector is arranged on a bottom side of the circuit board and includes control signal pins connected to the storage unit, power pins connected to the power circuit, and bus signal pins connected to the display unit.

Abstract: A power supply device used to provide electric power to a number of servers includes a first power supply and a selection circuit. The selection circuit includes a number of NOT gates, a number of controllers, and a number of transistors. An input terminal of each NOT gate is electrically connected to one of the corresponding servers. Each controller is electrically connected an output terminal of one corresponding NOT gate. A gate of each transistor is electrically connected to one of the corresponding controller, a drain of each transistor is electrically connected to the first power supply, and a source of each transistor is electrically connected to one of the corresponding server. Wherein when some of the server is powered on, the powered on servers generate power on signals which are transmitted to the corresponding controllers, the controllers generates corresponding turn on signals to turn on the corresponding transistors.

Abstract: An exemplary Peripheral Component Interconnect Express (PCIE) interface card is electrically coupled to a CPU. The PCIE interface card includes a circuit board, a first PCIE interface module arranged on the circuit board, at least one second PCIE interface module arranged on the circuit board, and a PCIE switch arranged on the circuit board. The PCIE switch is electrically coupled to the first PCIE interface module and the at least one second PCIE interface module. The PCIE switch transmits data from the CPU to the first PCIE interface module, and exchanges data between the CPU and the at least one second PCIE interface module.

Abstract: A server includes a backplane, first and second groups of motherboards, and first and second groups of fans. When the first group of motherboards are not operating, no power is output by the group. The first group of fans is not powered on. When the second group of motherboard are not operating, no power is output by the group. The second group of fans is not powered on. When at least one motherboard in the first group of motherboards is operating, the working motherboard outputs power to the first group of fans. The first group of fans are powered on. When at least one motherboard in the second group of motherboards is operating, the working motherboard outputs power to the second group of fans. The second group of fans is powered on.

Abstract: A network wake up system includes a network card, a controller, a south bridge chip, and a baseboard management controller (BMC). The network card receives a network wake up data packet, and outputs a network wake up signal. The BMC determines whether a temperature of the computer is in a predetermined temperature range and determines whether a voltage of the computer is normal, and outputs a state signal to the controller. If the temperature of the computer is in the predetermined temperature range and the voltage of the computer is normal, the controller wakes up the computer at the power-off state. If the temperature of the computer is not in the predetermined temperature range or the voltage of the computer is abnormal, the controller fails to output the network wake up signal to the south bridge chip, so that the computer at the power-off state cannot be woken up.