Abstract: The present invention provides an apparatus for adjusting a working frequency of a VRD. The apparatus includes a current detecting circuit, a variable resistance module, and a controller. The current detecting circuit is adapted for determining an output load state of the VRD by detecting a value of a current outputting from the VRD, and outputting a control signal for adjusting the working frequency of the VRD according to the output load state of the VRD. The variable resistance module is coupled to the VRD, and is adapted for providing an external resistor to the VRD. The controller is coupled to the current detecting circuit, and is adapted for receiving the control signal, and adjusting a resistance of the variable resistance module, so as to adjust the working frequency of the VRD.

Abstract: An isolation circuit is provided. The isolation circuit is coupled between a master circuit and a slave circuit for isolating or conducting an inter integrated circuit (I2C) signal. While the master circuit has electricity and the slave circuit does not, the isolation circuit isolates the master circuit to prevent the I2C signal being transmitted to the slave circuit. While the master circuit and the slave circuit have electricity, the isolation circuit conducts the master circuit to transmit the I2C signal to the slave circuit. The present invention solves the signal isolation problem between the master and slave circuits, and also improves the operational stability of an I2C bus.

Abstract: The invention provides an apparatus for adjusting a working frequency of a VRD by detecting temperature. The apparatus includes a temperature control module, a load module and a controller. The temperature control module is used for detecting a temperature of a CPU, and judging an output load state of the VRD according to the detected temperature of the CPU, so as to output a control signal according the output load state. The load module is connected to the VRD, and is used for providing an external resistance to the VRD. The controller is respectively coupled to the load module and the temperature control module, and is used for receiving the control signal and adjusting a resistance of the load module according to the received control signal, so as to adjust a working frequency of the VRD. A power consumption of the VRD may be reduced based on the present invention.

Abstract: A core voltage controlling apparatus suitable for a center processing unit (CPU) is provided. The apparatus includes a level shifting unit, a time-delay unit and a logic unit. An input terminal of the level shifting unit receives and shifts a first voltage signal, and an output terminal generates a second voltage signal, in which the first voltage signal indicates a power-on stable state, and the second voltage signal indicates a magnitude of the core voltage. The time-delay unit delays the second voltage signal to generate a third voltage signal. The logic unit is coupled to the time-delay unit for performing a logic operation on the third voltage and a fourth voltage signal transmitted by a power supply, and generating a fifth voltage signal for controlling a core voltage generator whether to provide the core voltage to the CPU or not, in which the fourth voltage signal indicates a power state.

Abstract: A structure compatible with I2C bus and system management (SM) bus is provided. The structure includes a first device having an I2C bus interface, a second device having a SM bus interface, and a timing buffering apparatus connected between the I2C bus interface and the SM bus interface. The timing buffering apparatus provides a time delay when the first device sends data to the second device so as to meet the requirement of the second device to data holding time.

Abstract: A memory reset apparatus including a first inverse circuit, a logic circuit, and a plurality of second inverse circuits is provided. The first inverse circuit receives a control signal generated by a north bridge and generates a first signal, in which the control signal controls reset of a plurality of memories. The logic circuit performs a logic operation of the first signal and an indicating signal and generates a second signal, in which the indicating signal indicates each component of a computer system completely powered on. The plurality of second inverse circuits is respectively coupled between the logic circuit and the memories. The second inverse circuits inverse the second signal and respectively generate a plurality of reset signals to the memories, so as to reset the memories.

Abstract: A fan speed control device includes a management selection module, a first and a second buffers, a resistor, a transistor, and a switch. Depending upon whether a motherboard supports a system of a baseboard management control or not, the fan speed control device selectively uses an indicative signal of a serial input and output interface or an indicative signal of the baseboard management control to indicate a power-on status. At the power-on moment, the fan speed control device controls the fan to operate at its minimum speed, so that a system crash due to a power output shortage of a power supply can be avoided. As the system enters stable operation, the fan speed is controlled by a pulse width modulation signal.

Abstract: A feedback and comparison apparatus applicable to a DC-DC voltage converter is provided. The feedback and comparison apparatus includes a comparator and a voltage feedback circuit. The voltage feedback circuit includes a first voltage dividing component and a second voltage dividing component. The comparator compares a feedback voltage with a first reference voltage, and outputs a control signal to the DC-DC voltage converter according to the comparing result. One end of the first voltage dividing component is coupled to an output voltage output by the DC-DC voltage converter and the other end of the first voltage dividing component is coupled to one end of the second voltage dividing component, for providing the feedback voltage. The other end of the second voltage dividing component is coupled to a second reference voltage. The present invention is applicable to a situation that the output voltage is smaller than the reference voltage.

Abstract: A power measuring apparatus including a voltage transformer, a voltage-current measuring circuit, and an operation unit is provided. The voltage transformer converts an input voltage signal into an output voltage signal. The voltage-current measuring circuit includes an inductor, a first resistor, a first capacitor and a second capacitor. A first end of the first inductor herein receives the output voltage signal and a second end thereof generates a voltage feedback signal. The operation unit performs an operation on the voltage feedback signal and a terminal current signal between the first terminal and the second terminal of the first capacitor so as to calculate a power signal. In this way, the accuracy of thermal test is effectively increased by the presented invention.