Abstract: A pulse width modulation (PWM) fan controller is used for an electronic device. The PWM fan controller includes a number of PWM signal generators, a number of PWM signal output elements, and a control unit. The control unit includes a number of outputs. An input of each PWM signal generator is electrically connected to a corresponding output of the control unit. An input of each PWM signal output element is electrically connected to an output of a corresponding PWM signal generator. An output of each PWM signal output element is electrically connected to a corresponding fan of the electronic device. The control unit is configured to control the PWM signal generators to sequentially generate a PWM signal to drive a corresponding fan to rotate in a preset time.

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 test device includes a motherboard and a connection module. The motherboard includes a basic input output system (BIOS) chip, a complex programmable logic device (CPLD) chip, and a motherboard connector. The connection module includes a test connector connected to the motherboard connector, a first port connected to random access memory (RAM) of the BIOS chip, and a second port connected to the CPLD chip. A RAM simulator updates or tests BIOS programs stored in the RAM by connecting to the first port. A personal computer (PC) can electronically communicate with the CPLD chip by connecting a parallel interface of the PC to the second port.

Abstract: A display card assembly includes a display card with a first circuit board, a straight through connector, and an expansion card with a second circuit board. A first edge connector is arranged on a bottom edge of the first circuit board and includes first power pins connected to a control chip and first storage chips, first ground pins, and first signal pins. A second edge connector connected to the straight through connector is arranged on an end edge of the first circuit board adjoining the bottom edge and includes second power pins connected to the first power pins, second ground pins, and second signal pins connected to the control chip. A third edge connector engaged in the straight through connector is arranged on an end edge of the second circuit board and includes third power pins and third signal pins connected to the second storage chips, and third ground pins.

Abstract: A hard disk drive (HDD) connector includes a motherboard port, a HDD port, and a signal processing circuit. The motherboard port and the HDD port are connected to a motherboard and a HDD, respectively. The signal processing circuit includes a signal processing module. The signal processing module is connected between the motherboard port and the HDD port to enhance signal transmission integrity between the motherboard and the HDD.

Abstract: A memory power supply circuit is used for providing power to a first memory module received in a first memory slot and a second memory module received in a second memory slot, and comprises a logic circuit and a switching power supply. The logic circuit comprises a first input terminal electrically connected to the first memory slot, a second input terminal electrically connected to the second memory slot, and a first signal terminal. The switching power supply comprises a first power terminal, a second power terminal, and a second signal terminal electrically connected to the first signal terminal. When the first memory slot and the second memory slot receive the first memory slot and the second memory module, the switching power supply turns on the first power terminal and the second power terminal; otherwise, the switching power supply turns off the first power terminal or the second power terminal.

Abstract: A computer system includes a plurality of servers, a connection unit, and a control unit. Each of the plurality of servers generates feedback signals, a first type of control signals, and high-speed signals. The control unit includes an integrated baseboard management controller (IBMC) and a strobe circuit, and the IBMC generates a second type of control signals. Each of the plurality of servers is electrically connected to the control unit via the connection unit. The feedback signals and the first type of control signals generated by each of the plurality servers are transmitted to the IBMC via the connection unit. The second type of control signals are transmitted to each of the plurality of servers via the connection unit, and the strobe circuit selectively transmits the high-speed signals generated by one of the plurality of servers to the IBMC.

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: 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 power supply device for a computer system with a plurality of servers includes a power supply, a switch circuit, and a control unit. Each of the plurality of servers are electrically connected to the power supply via the switch circuit. The control unit is electrically connected to the power supply, the switch circuit, and each of the plurality of servers. Each of the plurality of servers is configured to send a selection signal to the control unit. Upon receiving the selection signal from one or more of the plurality of servers, the control unit turns on the power supply and controls the switch circuit to electrically connect the power supply with the one or more of the plurality of servers sending the selection signal.

Abstract: A disk drive assembly includes an enclosure, a printed circuit board (PCB), a back board, a drive bracket, a first disk drive, and a second disk drive. The enclosure includes a bottom wall. The PCB is mounted on the bottom wall and parallel to the bottom wall. The back board is connected to and parallel to the PCB. The drive bracket includes a first side panel, a second side panel, and a third side panel parallel to each other. The first disk drive is mounted between the first side panel and the second side panel. The first disk drive is electrically connected to and perpendicular to the back board. The second disk drive is mounted between the second side panel and the third side panel. The second disk drive is electrically connected to and perpendicular to the back board.

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: An electronic device includes an enclosure. The enclosure includes a motherboard area and a power supply area adjacent to the motherboard area, which are both located at a first end of the enclosure, a hard disk drive area for mounting hard disk drives at a second end of the enclosure, and a fan area arranged between the motherboard area and the hard disk drive area.

Abstract: A memory module includes a ground terminal, a power terminal, a voltage regulator down, and a storing unit. The power terminal and the ground terminal are connected to a power source that supplies a first direct voltage. The voltage regulator down is connected to the power terminal and configured for converting the first direct current voltage to a second direct current voltage. The storing unit is connected the voltage regulator down for storing data and reading or writing data when the storing unit receives the second direct current voltage.

Abstract: A computer system includes a serial advanced technology attachment dual-in-line memory module (SATA DIMM) with a circuit board, a motherboard, and an indicating unit. An edge connector is set on a bottom edge of the circuit board to engage in a memory slot of the motherboard. A SATA connector is arranged on the circuit board and connected to a storage device interface of the motherboard. The indicating unit is connected to the motherboard for indicating the data transfer rates of the SATA DIMM module through two light emitting diodes.

Abstract: A bridging board configured for connecting a processor with a hard disk backboard includes a first signal connecting apparatus, a second signal connecting apparatus, a plurality of duplexer and a signal conditioner. The first signal connecting apparatus is electronically connected to the processor. The second signal connecting apparatus electronically connected to the hard disk backboard. Each duplexer has an input terminal electronically connected to the first signal connecting apparatus, and two output terminals electronically connected to the second signal connecting apparatus to allow the processor to communicate with the backboard via the bridging board. The signal conditioner is electronically connected between the first signal connecting apparatus and the second signal connecting apparatus to amplify signals transmitted from the processor to the hard disk backboard.

Abstract: A server system includes an enclosure, first to fourth subsystems, first to third AND gates, and an indicator. The indicator is mounted on a front panel of the enclosure. The first and second subsystems are respectively connected to two input terminals of the first AND gate. The third and fourth subsystems are respectively connected to two input terminals of the second AND gate. Output terminals of the first and second AND gates are respectively connected to two input terminals of the third AND gate. An output terminal of the third AND gate is connected to the indicator. When any one or more of the first to fourth subsystems breaks down, the indicator is started.

Abstract: A hard disk drive includes a control unit, a cache unit, a head unit, a platter unit, a spindle motor unit, a power supply unit, a switch unit, and an interface. When the switch unit is turned on, the power supply unit converts voltages of external power supplies received from the interface through the switch unit into operation voltages of the control unit, the cache unit, the head unit, the platter unit, and the spindle motor unit, and supplies the operation voltages to the control unit, the cache unit, the head unit, the platter unit, and the spindle motor unit. When the switch unit is turned off by the control unit, the voltages of the external power supplies cannot be transmitted to the power supply unit through the switch unit.

Abstract: A power supply system includes a state detection unit, a control unit, a first voltage regulator, a second voltage regulator, a first group of memory slots, and a second group of memory slots. The first voltage regulator supplies power to memory modules connected to the first group of memory slots. The second voltage regulator supplies power to memory modules connected to the second group of memory slots. The state detection unit detects operation states of the memory modules connected to the first and second groups of memory slots. When the state detection unit detects one of the memory modules connected to the first group of memory slots is damaged, the state detection unit outputs a control signal to the control unit. The control unit controls the first voltage regulator not to supply power to the memory modules connected to the first group of memory slots, after receiving the control signal.