Abstract: An information clearing system for providing power supply for a south bridge chip includes a power supply unit and a jumper. The power supply unit includes an internal power supply and is configured to receive an external power supply. The jumper includes a cap and a base. The base includes a first pin, a second pin, and a third pin. When the system malfunctions and needs to clear CMOS information in the south bridge chip, the cap is positioned on the second pin and the third pin of the base, the external power supply and the internal power supply both cannot be provided to the south bridge chip, the south bridge chip is grounded via the second pin and the third pin of the base, and the CMOS information in the south bridge chip is cleared.

Abstract: A power control circuit includes a manual switch, a detection module, a first resistor, a first signal switch, a time delay module and a control module. The first resistor outputs a high level signal to the detection module when connected to an external power source. The first signal switch outputs a low level signal according to a received high level signal. The time delay module provides a high level signal to the first signal switch in a delay time when the manual switch is pressed. The control module outputs a high level control signal to shut down a system power supply of a device when the detection module continuously detects a high level signal in a time period less than the delay time, and outputs a low level control signal to power on the system power supply when the detection module detects a low level signal in the time period.

Abstract: Voltage protecting circuit includes a sensing unit coupled to a power adaptor, a control circuit board for controlling the power adaptor, and a switching unit coupled to the sensing unit and the control circuit board. The sensing unit senses a current voltage of the power adaptor; the control circuit board receives the current voltage of the power adaptor when the switching module is switched on. The control circuit board controls the power adaptor to supply a power voltage when the current voltage of the power adaptor is less than a reference voltage. When the sensing unit receives the power voltage, the switching unit is switched off for preventing the power voltage from flowing into the control circuit board.

Abstract: A temperature monitoring system includes a detection module, a control module with a predetermined temperature value, and a display module. The detection module is configured to detect and generate an actual temperature value. The control module is configured to compare the actual temperature with the predetermined temperature value. The display module coupled to the detection module via the control module, and is configured to display the actual temperature value. When the control module identifies the actual temperature value is greater than the predetermined temperature value, the display module is controlled by the control module to display an alert indicator. The present disclosure further discloses a temperature monitoring method.

Abstract: A power supply system includes a rectifier circuit, a voltage decreasing circuit, and a feedback circuit. The rectifier circuit receives an AC voltage, and converts the AC voltage to a rectifying DC voltage. The voltage decreasing circuit decreases the rectifying DC voltage to a first DC voltage. The feedback circuit includes a photoelectric coupler, a PWM controller, a voltage regulating tube, and a variable resistor. The photoelectric coupler includes a light emitting unit and a switch unit. The variable resistor detects a change of the first DC voltage, and outputs a regulating signal. The voltage regulating tube adjusts a current flowing through the light emitting unit. The switch unit detects the light from the light emitting unit and turns on. The PWM controller outputs PWM signals to the voltage decreasing circuit. The voltage decreasing circuit adjusts the first DC voltage according to a duty cycle of the PWM signals.

Abstract: A battery protection circuit includes a control module, a first switch, and a loading module. The control module includes a second switch. A base terminal of the second switch is connected to a positive terminal of a battery, and an emitter terminal of the second switch is grounded. The first switch includes a gate terminal, a source terminal, and a drain terminal. The gate terminal is connected to the control module and further connected to a collector terminal of the second switch, and the source terminal is grounded. The drain terminal is connected to a first capacitor, and the first capacitor is grounded. The loading module is connected to the battery. When the loading module is abnormal, the gate terminal receives a control signal to switch off the first switch.

Abstract: A surging current suppression circuit includes a voltage regulating circuit and a switch circuit. The voltage regulating circuit receives a first DC voltage, and converts the first DC voltage to a second DC voltage. The switch circuit receives the second DC voltage, and outputs a working current according to the second DC voltage. The switch circuit outputs the working current to the electronic device when the working current is lower than a rate current of the electronic device. The working current is grounded via the switch circuit when the working current is higher than the rate current of the electronic device; and the electronic device can not receive the working current when a surging current occurred.

Abstract: An alarm system for alarming whenever there is a power leakage from an electronic device, includes a voltage decreasing circuit, a switch circuit and an alarm circuit. The voltage decreasing circuit receives a first voltage from a live wire output terminal and outputs a second voltage. The switch circuit outputs a control signal when the power leakage is detected. The switch circuit is electrically connected to a connection port. The connection port is electrically connected to the live wire output terminal and a neutral wire output terminal. The alarm circuit receives the control signal and alarms. If there is power leakage from the electronic device, the first voltage from the live wire input terminal flows into the ground wire input terminal via the electronic device; the switch circuit turns on and the alarm circuit is closed to alarm.

Abstract: A power supply circuit for power control chips includes a voltage control circuit, a voltage output circuit and a feedback protect circuit. The voltage control circuit receives a first DC voltage, and outputs a voltage driving signal according to the first DC voltage. The voltage output circuit receives the voltage driving signal, and outputs a second DC voltage to a load according to the voltage driving signal. The feedback protect circuit receives the second DC voltage. The feedback protect circuit is turned on and connects the voltage control circuit to ground when the second DC voltage is over voltage. The voltage control circuit discharges to ground via the feedback protect circuit.

Abstract: A battery protection circuit includes a control module, a first switch, and a loading module. The control module includes a second switch. A base terminal of the second switch is connected to a positive terminal of a battery, and an emitter terminal of the second switch is grounded. The first switch includes a gate terminal, a source terminal, and a drain terminal. The gate terminal is connected to the control module and further connected to a collector terminal of the second switch, and the source terminal is grounded. The drain terminal is connected to a first capacitor, and the first capacitor is grounded. The loading module is connected to the battery. When the loading module is abnormal, the gate terminal receives a control signal to switch off the first switch.

Abstract: A motherboard includes an I/O chip, a south bridge chip, and a delay circuit. The I/O chip detects a standby voltage on the motherboard and outputs an indicating signal that indicates whether the standby voltage is at high level. The south bridge chip is connected to the I/O chip to receive the indicating signal. The delay circuit is connected to the I/O chip and the south bridge chip. The delay circuit delays the indicating signal before sending the indicating signal to the south bridge chip.

Abstract: A power supply circuit is capable of providing power to a video card chipset. The video card chipset includes a first power supply pin and a second power supply pin. The power supply circuit includes a power input, a first filtering circuit, and a second filtering circuit. The first filtering circuit is connected between the power source and the first power supply pin to filter the power provided to first power supply pin of the video card chipset. The second filtering circuit is connected between the power source and the second power supply pin to filter the power provided to second power supply pin of the video card chipset.

Abstract: An output circuit for audio codec chip includes a noise eliminating circuit electrically coupled to the audio codec chip for eliminating noise signals. The noise eliminating circuit includes a first switch and a second switch. When the audio codec chip output signals jump from low voltage level to high voltage level, the noise signals are grounded via the first and second switches respectively.

Abstract: A power supply circuit is provided. The power supply circuit includes an audio codec chip and a voltage absorbing circuit. The audio codec chip has a power input terminal. The power input terminal is connected to a power source terminal. The voltage absorbing circuit is connected between the power source terminal and the power input terminal of the audio codec chip so as to decrease a divided voltage accomplished with a voltage from the power source terminal to low level. A method configured for starting up an audio codec chip on a computer motherboard in a normal manner is also provided.

Abstract: A power supply circuit for south bridge chip includes a voltage conversion chip, a control circuit, and a voltage increasing circuit coupled electrically to the voltage conversion chip and the control circuit. The voltage conversion chip is configured for outputting a driving signal. The control circuit is configured for receiving the driving signal and a first voltage, and converting the first voltage to a second voltage according to the driving signal. The voltage increasing circuit is configured for increasing voltage level of the second voltage, wherein the second voltage is supplied to the south bridge chip via the voltage increasing circuit.

Abstract: A power supply circuit for IEEE 1394 interface includes an IEEE 1394 interface control chip, an interface circuit, and a power circuit. The IEEE 1394 interface control chip outputs transmission protocol signals. The interface circuit is electrically connected to the IEEE 1394 interface control chip by a number of differential signal transmission lines. The interface circuit receives the transmission protocol signals and exchanges data with a peripheral device according to the received transmission protocol signals. The power circuit has a voltage decreasing circuit and provides working voltage to the interface circuit. The voltage decreasing circuit receives a DC voltage and converts the received DC voltage to the working voltage.

Abstract: A power supply circuit includes a PWM controller capable of providing pulse signals to a CPU, and an I/O controller electrically coupled to the PWM controller and the CPU respectively. The I/O controller is capable of receiving voltage selection signals from the CPU and outputting a control signal to the PWM controller. The PWM controller is capable of adjusting pulse signals provided to the CPU according to the control signal.

Abstract: A circuit for controlling a peripheral device interface is to enable a central processing unit to detect a peripheral device. The circuit includes a control chip and first to sixth capacitors. The control chip includes a power supply input pin, first to second differential signal output pins, first to second differential signal input pins, and an expansion pin. The power supply input pin is connected to a power supply and grounded via the first and second capacitors in parallel. The first and second differential signal output pins are connected to the peripheral device interface via the third and fourth capacitors respectively. The first and second differential signal input pins are connected to the peripheral device interface via the fifth and sixth capacitors respectively. The expansion pin is grounded via a resistor.

Abstract: A DDC interface circuit includes a first NMOS transistor and a second NMOS transistor. The gates of the first and the second NMOS transistors are all connected to a 3.3V system power via a first resistor. The source of the first NMOS transistor is connected to a DDC_CLK pin of a north bridge. The drain of the first NMOS transistor is connected to a 5V system power via a second resistor, and also connected to an SCL pin of a VGA interface via a third resistor to receive an ACK signal. The source of the second NMOS transistor is connected to a DDC_DATA pin of the north bridge. The drain of the second NMOS transistor is connected to the 5V system power via a fourth resistor, and also connected to an SDA pin of the VGA interface via a fifth resistor.

Abstract: A computer system includes a north bridge chip, a power source, and a resistor-capacitor filter circuit coupled between the power source and the north bridge chip. The north bridge chip has a digital-to-analog converter analog power pin and a digital-to-analog converter analog ground pin. The power source is coupled to the digital-to-analog converter analog power pin of the north bridge chip. The resistor-capacitor filter includes a first resistor and a first capacitor. The first resistor is connected between the power source and the digital-to-analog converter analog power pin of the north bridge chip. One end of the first capacitor is connected to the digital-to-analog converter analog power pin of the north bridge chip, and another end of the first capacitor is connected to ground together with the digital-to-analog converter analog ground pin of the north bridge chip.