Abstract: A fan control system includes a temperature detecting circuit and a rotation rate control circuit. The detecting circuit includes a first amplifier, a second amplifier, and a thermistor. The rotation rate control circuit includes a first terminal, a second terminal, and a third terminal. The detecting circuit detects temperature and outputs a voltage signal. The rotation rate control circuit receives the voltage signal and controls the rotation rate of the fan according to the voltage signal.

Abstract: Techniques are disclosed for generating a cipher key such that an encryption algorithm typically usable in accordance with a first security context can be used in accordance with a second security context. In one example, the first security context is a UMTS security context and the second security context is a GSM security context.

Abstract: A method and system for optimizing a data structure for manipulation of matrices in a parallel environment limits computational branching. The data structure further is further optimized for linear data storage and synchronization among multiple processing threads.

Abstract: A fan speed control circuit includes a voltage input terminal, a thyristor, a thermistor, and first and second switches. The terminal is grounded through a first resistor and the thermistor, connected to an anode of the thyristor, and connected to a second terminal of the second switch through a second resistor. A node between the resistor and the thermistor is connected to a control terminal of the first switch. A second terminal of the first switch is grounded. A first terminal of the first switch is connected to a control terminal of the thyristor through a third resistor. A fourth resistor is connected between the anode and control terminal of the thyristor. A control terminal of the second switch is connected to the control terminal of the thyristor. A first terminal of the second switch is connected to a cathode of the thyristor and a voltage pin of a fan.

Abstract: A temperature monitoring circuit includes a negative temperature coefficient (NTC) resistor, a zener diode, an alarm, a silicon controlled rectifier. A first terminal of the NTC resistor is connected to a power supply through a first resistor. A second terminal of the NTC resistor is grounded. A cathode of the zener diode is connected to a node between the NTC resistor and the first resistor. An anode is grounded through a second resistor. A first terminal of the alarm is connected to the cathode of the zener diode, and is grounded through a third and fourth resistors in series. A cathode of the silicon controlled rectifier is connected to the anode of the zener diode. An anode of the silicon controlled rectifier is connected to a second terminal of the alarm. A control terminal of the silicon controlled rectifier is connected to a node between the third and fourth resistors.

Abstract: An under-voltage warning circuit includes a Zener diode, a transistor, an annunciator, and a thyristor. When the power source is within a certain range, the annunciator does not work. When the voltage level of the power source V_in is lower than the predetermined value, the annunciator works to denote that the power source is under-voltage.

Abstract: A system and method for testing a computer divide test programs in a test file into hardware test programs and software test programs. A test server selects one or more test programs from the divided test file according to test parameters of the computer. The test server generates a test command for testing test items of the computer. The computer executes the test command. The test server analyzes test results and stores analyzed results into a predefined storage path.

Abstract: A voltage stabilizing circuit including an input port, an output port, a transistor, a diode, a three-terminal voltage regulating reference source, a first resistor, and a second resistor. The transistor has a collector terminal and an emitter terminal connected to the input port and the output port, respectively. The diode has an anode connected to the input port and a base terminal of the transistor. The three-terminal voltage regulating reference source has an anode connected to ground, a cathode connected to the input port and a cathode of the diode, and a reference terminal The first resistor is connected between the cathode of the diode and the reference terminal of the three-terminal voltage regulating reference source. The second resistor is connected between ground and the reference terminal of the three-terminal voltage regulating reference source.

Abstract: A starting circuit for a single-phase AC motor, the single-phase AC motor comprising a main winding and a starting winding, and the starting circuit comprising a detecting circuit, a rectifying circuit, a triggering circuit, and a switch, wherein the detecting circuit is connected in series with the main winding, the switch is connected in series with the starting winding, the detecting circuit transfers current parameters of the main winding into detecting signals, the rectifying circuit processes the detecting signals and transmits the detecting signals to the triggering circuit, the triggering circuit controls the switch according to the detecting signals whereby controlling power-on and power-off of the starting winding, and the triggering circuit is a hysteresis comparing circuit.

Abstract: An auto-shut off circuit includes a relay, a voltage conversion device, a first diode, a second diode, a third diode, a capacitor, a first transistor, and a second transistor. The relay includes a coil and a switch. The auto-shut off circuit disconnects an electronic device from a power supply when the electronic device is not at a working state.

Abstract: A voltage detection circuit used to detect a voltage source includes a Zener diode, a thyristor, a first resistor, a second resistor, a first light-emitting diode (LED), and a second LED. A cathode of the Zener diode is connected to the voltage source. An anode of the Zener diode is connected to a control terminal of the thyristor through a first resistor. An anode of the thyristor is connected to the voltage source through a second resistor. The anode of the thyristor is connected to an anode of the first LED. A cathode of the thyristor is connected to a cathode of the first LED. The cathode of the thyristor is connected to an anode of the second LED, and a cathode of the second LED is grounded.

Abstract: A daughter circuit board of an electronically commutated motor for interface signal conversion, having circuit units integrated on the daughter circuit and eight ports for communicating with a control system of a user terminal, the daughter circuit board being plugged into a motor controller for signal conversion so that the motor controller communicates with the control system of the user terminal. The eight ports include an input port of power supply, a port of mode selection, a signal port of PWM, a R/T port for data transmission between the daughter circuit board and the control system of the user terminal, a port of COM, a port for fault signal output, a port of power indication, and a port of speed feedback. The daughter circuit board is simple, easy to correspond with various control systems of user terminals, and accords to the latest electric standard thereby facilitating management and popularization.

Abstract: A fan control system includes a temperature detecting circuit and a rotation rate control circuit. The detecting circuit includes a first amplifier, a second amplifier, and a thermistor. The control circuit includes a first terminal, a second terminal, and a third terminal. The detecting circuit detects temperature and outputs a voltage signal. The control circuit receives the voltage signal and controls the rotation rate of the fan according to the voltage signal.

Abstract: An ignition circuit includes a system power supply, an ignition coil, a delay unit, a first switch unit, and a second switch unit. When the system power supply is powered on, the second switch unit is turned on, the ignition coil is powered on. After a delay time, the delay unit controls the first switch unit to be turned on, the second switch unit is turned off, the ignition coil is powered off. Therefore an ignition operation is accomplished.

Abstract: A fan drive circuit for driving a fan used in an electronic device to rotate includes a heat detector, a control unit, an integrating circuit, a regulating circuit; and a power supply. The power supply cooperates with the regulating circuit to drive the fan to rotate, the control unit detects the temperature of the one or more components of the electronic device using the heat detector and cooperates with the integrating circuit to generate a speed control voltage that changes with change of the temperature, and the speed control voltage is input to the regulating circuit to regulate a rotation rate of the fan.

Abstract: A dual-speed single-phase AC motor, including: a stator, including a stator core, and a coil winding, including a starting winding, a first main winding, and a second main winding, a rotor, and a starting circuit, including a rectifying and voltage-stabilizing circuit, a detecting circuit, a voltage comparison circuit, a first switching circuit, a second switching circuit, and a third switching circuit. The number of poles of the starting winding is the same as that of the first main winding. The number of poles of the first main winding is less than that of the second main winding.

Abstract: A networked motor, including a motor body, including a stator, a rotor, and a housing, and a motor controller, including a power circuit, a digital controller, a drive module, and a detecting circuit. A communication circuit module is connected to the digital controller. The communication circuit module includes a wired communication module or a wireless communication module. The wired communication module or the wireless communication module is disposed in or outside the motor controller.

Abstract: A printed circuit board includes a power layer, a ground layer, a signal layer, and a backboard. The backboard is arranged below the signal layer opposite to the ground layer. A number of vias are formed from the backboard through the signal layer, and then connected to the ground layer.

Abstract: A regulating system includes an input port, an output port; and an overvoltage protection circuit. The an overvoltage protection circuit includes a fuse, a semiconductor controlled rectifier (SCR), a first resistor, and a voltage regulator. The fuse includes a first end and a second end. The SCR includes a gate, an anode, and a cathode. The regulator includes a cathode and an anode. The first end of the fuse is connected to the input port, the second end of the fuse is connected to the anode of the SCR, the cathode of the SCR is connected to the ground, the gate of the SCR is connected to the anode of the regulator through the first resistor, the cathode of the regulator is connected to the output port.