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: 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: 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.

Abstract: A power supply device for a network attached storage (NAS) is connected to both a power over Ethernet (POE) system and a direct current (DC) power supply. A control unit of the power supply device receives a voltage provided by the POE system and a voltage provided by the DC power supply, and compares the two voltages with each other. When the voltage provided by the DC power supply equals or is greater than the voltage provided by the POE system, the control unit inputs electric power of the DC power supply to the NAS and prevents electric power of the POE system from being input to the NAS. When the voltage provided by the DC power supply is less than the voltage provided by the POE system, the control unit allows electric power of the POE system to be input to the NAS.

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 exemplary infrared control system includes an infrared control unit and a computer. The infrared control unit is capable of transmitting an infrared signal. The computer includes an infrared response unit, and the infrared response unit includes an infrared receiving circuit and a control circuit electrically connected to the infrared receiving circuit. The infrared receiving circuit is capable of receiving the infrared signal from the infrared control unit. Accordingly the control circuit is capable of processing the infrared signal from the infrared receiving circuit to generate a corresponding command signal to control the computer to power on/off or reset.

Abstract: An air duct includes a cover and two adjusting pieces. The cover includes a top board and two end boards extending downwards from two opposite ends of the top board. The cover defines an air outlet in a front of the cover and an air intake in a rear of the cover. Two adjusting pieces are slantingly extended from rear ends of the two side boards toward the air outlet.