Abstract: A heat sink is used to cool electronic components, and includes a metal base portion, a motherboard and a heat conducting sheet. The motherboard and the heat conducting sheet are positioned on the metal base portion. The motherboard includes a copper foil. The electronic components are electrically connected on the copper foil; the heat conducting sheet is positioned between the metal base portion and the motherboard, and contacts the metal base portion and the motherboard. The heat of the electronic components is conducted to the metal base portion through the copper foil, the motherboard and the heat conducting sheet.

Abstract: An overheating protection circuit for an electronic device includes a detection circuit, a switch element, and a control element. The detection circuit is positioned adjacent to an integrated circuit (IC) peripheral circuit of the electronic device and detects a temperature of the IC peripheral circuit. The switch element is electrically connected to the detection circuit, and the control element is electrically connected to the switch element and a heat dissipation device of the electronic device. The detection circuit generates a detection signal to turn on the switch element in response to detecting that a temperature of the IC peripheral circuit increases, and the control element controls the heat dissipation device to dissipate heat generated by the IC peripheral circuit in response to detecting that the switch element is turned on.

Abstract: A power supply system for a central processing unit (CPU) mounted on a motherboard includes a power supply unit, a conducting layer, and a number of conducting foils. The conducting layer is set on the motherboard. The conducting foils are connected to the conducting layer in parallel. The power supply unit supplies power to the CPU through the conducting layer and the conducting foils.

Abstract: A test system includes a motherboard and a test card. The motherboard includes a number of electronic components and a first connector. The test card includes a second connector and a number of indicating circuits. The first connector includes a number of signal pins. Each signal pin of the first connector is connected to a corresponding signal terminal of the electronic components, to receive a power good signal. The second connector includes a number of signal pins. Each signal pin of the second connector is connected to a corresponding signal pin of the first connector, to receive a corresponding power good signal. Each indicating circuit is connected to a corresponding signal pin of the second connector, and indicates whether the corresponding signal pin of the second connector outputs a power good signal.

Abstract: A current measurement circuit to measure current flowing through an inductor includes two metal oxide semiconductor field effect transistors, a resistor, a negative temperature coefficient thermistor, two capacitors, and a pulse width modulator.

Abstract: A central processing unit (CPU) test system includes a CPU socket, a CPU core controller, and a CPU test device. The CPU core controller stores a start voltage message. The CPU test device includes a voltage detection pin, an analog to digital (A/D) converter, and a microcontroller. The voltage detection pin detects a voltage of an electronic device connected to the CPU socket. The A/D converter converts the detected voltage into a digital signal. The microcontroller controls the CPU core controller to output the start voltage to the CPU socket according to the digital signal. The microcontroller stores a predetermined start voltage message. The microcontroller reads the start voltage message after controlling the CPU core controller to output the start voltage, and determines whether the CPU core controller supplies the start voltage to the CPU socket by comparing the read start voltage message with the predetermined start voltage message.

Abstract: A power matching system is applied to a central processing unit (CPU) power supply, which includes a power control chip to regulate the frequency of the signal applied to the CPU power supply. The power control chip includes a detecting pin. The power matching system includes a control unit and a control circuit. The control unit includes a platform controller hub (PCH) to obtain information concerning a CPU, a basic input output system (BIOS) to obtain a power rating of the CPU, and an integrated baseboard management controller (IBMC) to output a required signal to the control circuit according to the power rating established. The power control chip receives the required signal from the control circuit and regulates the frequency of the signal applied to the CPU power supply.

Abstract: A fan control circuit is used to control first and second fans to be powered on at different time after receiving a power good (PWGD) signal from a motherboard. The fan control circuit includes a first control circuit, a delay circuit, and a second control circuit. The first control circuit and the delay circuit are connected to the motherboard to receive the PWGD signal. The first control circuit powers the first fan after receiving the PWGD signal. The delay circuit delays the received PWGD signal, and outputs the delayed PWGD signal to the second control circuit after a delay time. The second control circuit powers the second fan after receiving the delayed PWGD signal.

Abstract: A chip test system includes a digital control chip, a controller, and an indication circuit. A configuration file is burned into the digital control chip. The configuration file includes a first identification number. The controller reads the number from the configuration file and determines whether the number is the same as a predetermined identification number. If the numbers match, the controller outputs a first level signal to the indication circuit. If the numbers do not match, the controller outputs a second level signal to the indication circuit.

Abstract: A protection circuit includes first and second electronic switches. When a CPU socket does not contain a CPU, a signal pin of the CPU socket outputs a high level signal. The first and second electronic switches are turned on. A data transmitting line of a SMBus is connected to a digital integrated chip. The parameters of the digital integrated chip can thus be regulated. When the CPU socket contains the CPU, the signal pin of the CPU socket outputs a low level signal. The first and second electronic switches are turned off. The data transmitting line of the SMBus is disconnected from the digital integrated chip, to prevent damage to the digital integrated chip.

Abstract: A voltage adjustment circuit includes a south bridge, a complex programmable logic device (CPLD), a power supply unit, a voltage conversion unit, and a resistance unit. The south bridge detects a type of a number of dynamic random access memories (DRAMs), and outputs a corresponding signal according to a detected result of the type of the DRAMs. The CPLD is connected to the south bridge to receive the signal, and outputs a corresponding control signal according to the signal. The voltage conversion unit is connected to the power supply unit and the DRAMs, and converts voltage output from the power supply unit into a stable voltage. The resistance unit is connected to the CPLD and the voltage conversion unit, and provides different resistance according to the control signal received from the CPLD, to adjust the voltage output from the voltage conversion unit to an operation voltage of the DRAMs.

Abstract: A power supply converting system includes a start unit for outputting power to a server through a number of circuitries, an obtaining unit, a comparison unit, a memory module, and a converting unit. The obtaining unit is connected to the start unit and the server, to obtain the model code of a central processing unit (CPU) of the server and transmits the model code to the comparison unit. The comparison unit compares the model code of the server CPU against a plurality of circuitry codes in a truth table stored in the memory module, to obtain a circuitry code corresponding to the model code of the server CPU. The converting unit adjusts the numbers of turned on circuitries based on the circuitry code from the comparison unit.

Abstract: A protection circuit includes an integrated circuit (IC), a peripheral circuit connected to the IC, and a measurement circuit connected to an enable pin of the IC. The peripheral circuit includes at least one element which generates heat. The measurement circuit includes a power supply, a resistor, and a thermistor. The heat from the element raises the temperature of the thermistor and changes a resistance of the thermistor and decreases a voltage of the node. When the voltage of the node is less than or equals to a standard voltage of the enable pin of the IC, the IC and the peripheral circuit stop working.

Abstract: A device to measure power consumption includes a processor connected to a central processing unit (CPU) and a memory module, a switch for setting the power measurement device to measure either the power supplied to the CPU or the power supplied to the memory, and a display to show the results of such measurements.

Abstract: A structure for automatically rotating a spiral rod is provided. The structure allows a dusting cloth to be turned into a spiral shape along the spiral rod by rotating a rotating element, and, while the rotating element is being rotated, a torsion spring generates a restoring torque. Once the rotating element is no longer rotated, a pulling element pressing against the teeth inside the rotating element retains the rotating element and thus keeps the dusting cloth in the spiral shape. When the pulling element is subsequently pulled away from the teeth of the rotating element, the rotating element automatically rotates in the reverse direction due to the restoring torque of the torsion spring.

Abstract: An output voltage adjustment circuit for buck circuits includes a microcontroller, first to eighth keys, and a display unit. The first to eighth keys input voltage adjustment signals to the microcontroller. A first input pin of the microcontroller is connected to a voltage output terminal. A second resistor is connected between the first input pin of the microcontroller and ground. A first to a sixth input/output pin of the microcontroller are connected to the display unit. A first to an eighth output pin of the microcontroller are connected to a pulse width modulation (PWM) controller. The first to eighth keys are selectively activated to provide voltage adjustment signals to the microcontroller, sampling output voltages of the voltage output terminal, comparing with a predetermined voltage, controlling the PWM controller to fine tune the duty cycle to output a stable voltage from the voltage output terminal. The display unit displays the voltages on the voltage output terminal.

Abstract: A wireless remote control device for controlling an electronic device includes a switch module, a wireless transmission module, a wireless receiving module and a control module. The switch module receives a DC voltage and outputs a first control signal. The wireless transmission module receives the first control signal and encodes the first control signal to output an encoded first control signal. The wireless receiving module receives the encoded first control signal and decodes the encoded first control signal to output a decoded first control signal. The control module receives the decoded first control signal and outputs a second control signal to turn on/off or reset the electronic device.

Abstract: An illumination brightness control apparatus receives an input voltage from a light dimmer and produces a control signal to regulate a drive signal to a power conversion switch of a switching mode power converter. The apparatus includes a voltage conditioning circuit to condition the dimmer input voltage to provide a conditioned voltage signal; an ADC circuit to sample analog data of the conditioned voltage signal at a sampling rate that is high relative to a nominal variation rate of the dimmer input voltage and to provide digital data corresponding to the sampled analog data; a digital signal processing circuit to produce a running data average of the digital data; and a controller to produce a signal corresponding to the running data average as the control signal to regulate the drive signal.

Abstract: A power supply circuit for a CPU (central processing unit) includes a CPU, a power supply, a plurality of voltage adjustment modules, a pulse width modulator, a plurality of resistivity selection modules, and a module management unit. The resistivity selection module includes an electronic switch, a first resistor, a second resistor, a third resistor, and a fourth resistor. When the CPU operates abnormally, the power supply circuit utilizes the resistors in the resistivity selection module as voltage dividers, thereby restricting MOSFET or other components to operate in a normal voltage range.

Abstract: An output voltage adjustment circuit for buck circuits includes a microcontroller, first to eighth keys, and a display unit. The first to eighth keys input voltage adjustment signals to the microcontroller. A first input pin of the microcontroller is connected to a voltage output terminal. A second resistor is connected between the first input pin of the microcontroller and ground. A first to a sixth input/output pin of the microcontroller are connected to the display unit. A first to an eighth output pin of the microcontroller are connected to a pulse width modulation (PWM) controller. The first to eighth keys are selectively activated to provide voltage adjustment signals to the microcontroller, sampling output voltages of the voltage output terminal, comparing with a predetermined voltage, controlling the PWM controller to fine tune the duty cycle to output a stable voltage from the voltage output terminal. The display unit displays the voltages on the voltage output terminal.