Abstract: A power circuit which is applicable to a data storage device. A boost circuit receives a first voltage and converts it to a second voltage. A charging and discharging circuit receives the second voltage and charges a charging capacitor. As long as a voltage detecting circuit detects that the second voltage exists, it outputs a first selection signal. When the voltage detecting circuit detects that the second voltage does not exist, it outputs a second selection signal and also outputs a signal to the charging and discharging circuit, to release a stored voltage. A voltage selection circuit will output the second voltage according to the first selection signal, or will output the stored voltage from the charging capacitor according to the second selection signal. Buck circuits convert the second voltage or the stored voltage to the different voltages required by a control chip of the data storage device.

Abstract: A printed circuit board (PCB) includes two power supply units, a central processing unit (CPU), two inductors and a temperature compensation resistor. One of the inductor is electrically connected between one power supply unit and the CPU, the other inductor is electrically connected between another power supply unit and the CPU. The temperature compensation resistor is electrically connected between the power supply units and ground, and is positioned between the two inductors to adjust output voltage from the CPU.

Abstract: An overcurrent protection device includes a power input terminal, a power output terminal, a first signal terminal, a second signal terminal, a testing circuit, and a switch element. The power input terminal and the first signal terminal are connected to a power supply. The power output terminal and the second signal terminal are connected to a computer motherboard. If the first and second terminals are disconnected from each other when the computer motherboard works, the power supply stops working. The testing circuit includes a fixed resistor and a control chip parallel connected between the power input and output terminal. The control chip stores a predetermined voltage threshold, and detects voltage between the two terminals of the fixed resistor, and compares the measured voltage with the predetermined voltage threshold. The switch element disconnects the first and second signal terminals when the measured voltage is greater than the predetermined voltage threshold.

Abstract: A frequency adjustment system includes a phase-locked loop (PLL) circuit, an adjusting circuit, and a voltage regulator module (VRM). The PLL circuit outputs a trigger signal when a communication frequency of a chip changes. The adjusting circuit adjusts a clock frequency of the adjusting circuit to receive communication data. The adjusting circuit further outputs a control signal to the VRM. The VRM outputs a voltage according to the control signal.

Abstract: A cable connector assembly comprises an electrical connector and a cable connected to a rear side of the electrical connector. The electrical connector comprises an insulative housing and a plurality of conductive terminals fixed thereto. The cable comprises a plurality of wires, a filler among the wires and an insulative covering which covers outer peripheries of the wires and the filler. The wires and the conductive terminals are electrically connected. The cable connector assembly further comprises an inner mold and a casing surrounding an outer periphery of the inner mold. The inner mold is integrally formed at outer peripheries of connections between the conductive terminals and the wires by over-molding. A part of the filler is embedded into the inner mold for stress relief.

Abstract: A sequence control circuit for power sources includes two switched circuits and a sequence control unit. Each of the switched circuits has a control node and is coupled between a power source and a load. The sequence control unit includes two output terminals coupled to the control nodes. The output terminals generate control signals to control the sequence of the circuits being turned on.

Abstract: A motherboard includes a motherboard power supply connector and a time delay circuit. The motherboard power supply connector connects a power supply unit. The motherboard power supply connector has a power supply on pin and a power good pin. The power good pin is configured for receiving a power good signal from the power supply unit. The time delay circuit has an input terminal and an output terminal. The input terminal is configured for receiving a power supply on signal. The output terminal is connected to the power supply on pin and is configured for sending the power supply on signal to the power supply on pin after a time delay determined by the time delay circuit.

Abstract: A computer motherboard includes a motherboard substrate defining a CPU loading area and a CPU voltage regulator power supply layout area. The power supply layout area is equally divided into a number of phase regions, and each of the phase regions has a number of spaced circuit layers. The circuit layers in the phase regions are symmetrical about a central axis of the CPU loading area, and a difference between each two simulating impedances between an impedance center of each of the phase regions and a loading center of the CPU loading area is within 1%.

Abstract: A power supply circuit includes a load, a chargeable battery, a discharging circuit, a charging circuit, an adapter, and a control circuit. When the adapter operates normally, the control circuit measures a voltage of the chargeable battery, and controls the charging circuit to charge the chargeable battery when the voltage of the chargeable battery is less than a preset value. The control circuit measures a charging current and a temperature of the chargeable battery, and regulates the charging current through the charging circuit according to the measured charging current and temperature. The adapter provides a voltage to the load through the discharging circuit. When the adapter is powered off, the control circuit does not sense a voltage a voltage from the adapter. The control circuit controls the chargeable battery to power the load through the discharging circuit.

Abstract: A control system for a battery includes a battery backup unit (BBU), a switch circuit coupled between the BBU and the adapter, and a complex programmable logic device (CPLD) coupled to the BBU and the switch circuit. The CPLD controls the switch circuit to turn on when an actual rate between a rest voltage and a rated voltage of the battery is less than a predetermined rate, to charge the battery through the switch circuit. If the actual rate is greater than or equal to the predetermined rate, the CPLD maintains the adapter to charge or discharge the battery according to state of the battery.

Abstract: A detection device to detect a power serving time of a super capacitor for a power-disconnected storage card and an amount of the data packets capable of being stored during the detected serving time is provided. The power-disconnected storage card includes a memory. The detection device includes a power supply unit, the super capacitor, a controller, a storage unit, and a detection unit. The storage unit stores the data packets. The detection unit includes a charge notification module, a data notification module and a time module. The charge notification module generates a first notification signal to the time module. The data notification module generates a second notification signal to the time module when the storage unit transmits the data packet to the memory. The time module records time when the memory completely store the data packet according to the first notification signal and the second notification signal.

Abstract: In a method for modularizing power supplies placed on a printed circuit board (PCB) using a computing device, a circuit design drawing of a power supply is obtained from a database. The method acquires circuit design data of the power supply from the circuit design drawing of the power supply, and modularizes the circuit design data to generate a virtual power supply. The method generates a first layout of the virtual power supply on the PCB in a landscape orientation according to a horizontal dimension of the PCB, and generates a second layout of the virtual power supply on the PCB in a portrait orientation according to a vertical dimension of the PCB. A component information system (CIS) management library is created in the database, and the first layout and the second layout of the virtual power supply are stored in the CIS management library.

Abstract: A buck converter includes a first MOSFET and a second MOSFET connected in series, a PWM module coupled to gates of the first MOSFET and the second MOSFET, and a control unit being coupled to the input current acquired unit, the input voltage acquired unit, the output current acquired unit, the output voltage acquired unit and the PWM module respectively, wherein the control unit controls a switch frequency of the PWM module and acquires the input current, the input voltage, the output current and the output voltage from the input current acquired unit, the input voltage acquired unit, the output current acquired unit and the output voltage acquired unit respectively.

Abstract: A driving voltage adjusting circuit includes a digital rheostat, a control chip, a low dropout regulating circuit, and a driving circuit. The control chip is connected with the digital rheostat, and configured for adjusting the resistance of the digital rheostat. The low dropout regulating circuit is connected with the digital rheostat and outputs an output voltage according to the resistance of the digital rheostat. The driving circuit comprising a number of switch elements connected with each other and a driver configured for driving the switch elements, each of the switch elements comprising a first terminal, a second terminal, and a control terminal configured for controlling connection and disconnection of the first terminal and the second terminal; the first terminal and the second terminal connected with the control chip, the driver is connected with the low dropout regulating circuit and output an driving voltage to the control terminal.

Abstract: An inductance measurement circuit includes a control circuit, a constant current supply circuit, a voltage detecting circuit, and a display circuit. The control circuit controls the constant current supply circuit to supply a first current for a first inductor. The control circuit controls the voltage detecting circuit to detect a voltage on the first inductor. The control circuit obtains an internal resistance of the first inductor by dividing the first voltage by the first constant current. The display circuit displays the internal resistance of the first inductor.

Abstract: A measurement circuit includes an instruction input unit, a charging circuit to charge a capacitor, a charging and discharging circuit to control the capacitor to leakage discharge, a control circuit, a first amplifying circuit, and a display unit. The control circuit receives a measurement instruction through the instruction input unit to control the charging circuit to charge the capacitor, and receives a stop charging signal from the charging circuit when a voltage of the capacitor reaches a saturation voltage for controlling the charging circuit to stop charging the capacitor. The first amplifying circuit measures a leakage voltage of the capacitor, amplifies the measured leakage voltage, and outputs the amplified leakage voltage to the control circuit. The display unit displays the leakage voltage of the capacitor.

Abstract: A measurement system includes a control circuit, a measurement circuit, and a display circuit. The measurement circuit includes a first capacitor. The control circuit outputs control signals to control first or second inductors and the first capacitor to compose an LC circuit. Inductance can be gained according to the formula: L = 1 4 ? ? · f 2 · C , where L stands for the inductance, f stands for a frequency of the LC circuit, ? stands for ratio of a circle's circumference to its diameter, and C stands for capacitance of the first capacitor. The control circuit also controls the first and second inductors to be connected in parallel and then connected in parallel to the first capacitor to compose an LC circuit, to determine a coupling inductance. A leak inductance is equal to a half of the coupling inductance. The display circuit displays the inductances of the first and second inductors and the leak inductance.

Abstract: An impedance measuring device for an electronic component includes a constant voltage source, a load supplying circuit, a voltage detection circuit, and a controller. The constant voltage source outputs an input voltage. The load supplying circuit supplies a load resistor that is electronically connected in series with the electronic component between the constant voltage source and ground. The voltage detection circuit detects a voltage across the load resistor. The controller receives the voltage across the load resistor from the voltage detection circuit, and calculates an equivalent impedance of the electronic component according to the input voltage, the voltage across the load resistor, and the resistance of the load resistor.

Abstract: An input power measuring device includes a board with an edge connector, a first dual inline memory modules (DIMM) socket, a resistor, a differential amplifier circuit, a voltage dividing circuit, a display screen, and a controller. When the edge connector is inserted into a second DIMM socket of a motherboard and the motherboard is powered on, the resistor samples first current, and converts the first current into a first voltage. The differential amplifier circuit amplifiers the first current to a second current. The voltage dividing circuit divides the first voltage, and outputs a second voltage. The controller converts the second current into a third current, converts the second voltage into a third voltage, and calculates a power according to the third current and the third voltage.

Abstract: A test device includes a transformer, a loop analyzer, and a protection circuit. The protection circuit includes a control unit, a signal acquisition and amplification unit, and an electronic switch. When the loop analyzer outputs a signal, the signal acquisition and amplification unit acquires the signal output from the loop analyzer, amplifies the acquired signal, and outputs the amplified signal to the control unit. The control unit transforms the received signal from analog form to digital form, and compares the digital signal with a reference value. If the digital signal is greater than the reference value, the control unit outputs a control signal to the electronic switch, to turn off the electronic switch. The signal output from the loop analyzer cannot be transmitted to a buck circuit.