Abstract: A printed circuit board includes a reference layer configured to connect to a power or a ground and a dielectric layer stacked on the reference layer. The dielectric layer includes a component surface opposing the reference layer. The component surface forms a differential pairs, a protection runner, and a power runner. The differential pairs include a substantially linear part. The protection runner is intervened between the linear part and the power runner, and is substantially parallel to the differential pairs. The length of the protection runner is approximately equal to that of the linear part. Each of the two ends of the protection runner forms a via that electrically connects the protection runner to the reference layer.

Abstract: A layout method of a differential pair generates the differential pair between a differential signal sender and a differential signal receiver in a printed circuit board (PCB). Differential signal is transmitted via two wires. A plurality of vertical lines are created at a breakout section and a trace section of the differential pair. Junctions of the vertical lines and the two wires are defined as pair of points. A first distance between one pin of the differential signal sender and a corresponding point of each pair of points and a second distance between the other pin of the differential signal sender and the other corresponding point of each pair of points are calculated. If a difference between the first distance and the second distance does not fall within an allowable range, the two wires are adjusted.

Abstract: An optical moulding process is disclosed comprising the sequential steps of: (a)(y) forming a layer of a photocurable composition; and (bXz) irradiating selected areas of the composition in the layer with radiation from a radiation source, thereby curing the composition in said selected areas and repeating the steps a) and b) on top of an earlier cured layer to form a three dimensional structure, wherein the radiation source used in step b) is a non-coherent source of radiation and wherein the photocurable composition comprises at least two curable components: (i) 45%-95% (and preferably at least 50%, more preferably at least 60%, e.g.

Abstract: A fan control system includes a linear adjustor, an input/output controller, and a temperature sensor. A first terminal of the linear adjustor is connected to a first power supply. A second terminal of the linear adjustor is connected to a fan and grounded via a first resistor and a second resistor in series. A third terminal of the linear adjustor is connected to a node between the first resistor and the second resistor. A first terminal of the input/output controller is connected to the third terminal of the linear adjustor via a third resistor. A second terminal of the input/output controller is connected to the temperature sensor.

Abstract: A voltage measuring circuit includes an under-voltage measuring circuit and an over-voltage measuring circuit. The under-voltage measuring circuit includes a first voltage comparator, a first zener diode, and a first light emitting diode. An inverting input of the first voltage comparator is connected to a cathode of the first zener diode. An output of the first voltage comparator is connected to a cathode of the first light emitting diode. The over-voltage measuring circuit includes a second voltage comparator, a second zener diode, and a second light emitting diode. A non-inverting input of the second voltage comparator is connected to the cathode of the second zener diode. An output of the second voltage comparator is connected to a cathode of the second light emitting diode.

Abstract: A motor, including: a stator, a rotor, and a motor controller. The motor controller is connected to a network interface circuit (NIC). The motor can be directly connected to a network, which makes it possible for technicians to facilitate remote control, debugging, remote diagnosis, and troubleshooting. The motor is easy to be identified, and features improved functions, wider application range, and more convenient use.

Abstract: A single-phase AC motor control circuit for a dryer, including a starting control unit, a first drive circuit, a bidirectional triode thyristor BCR1, a second drive circuit, and a bidirectional triode thyristor BCR2. The bidirectional triode thyristor BCR1 is serially connected to a motor starting winding, and a starting capacitor, and then to a utility power AC input. The starting control unit is connected to a control end of the bidirectional triode thyristor BCR1 via the first drive circuit. The bidirectional triode thyristor BCR2 is serially connected to an electrically heated strip, and then to the utility power AC input. The starting control unit is connected to a control end of the bidirectional triode thyristor BCR2 via the second drive circuit. The first drive circuit is interlocked with the second drive circuit.

Abstract: A motor, including a body, including a housing, a stator, and a rotor, and a controller, including a control box, and a control circuit board. The body is disposed at the top of the motor. The controller is disposed at the bottom of the motor. The control circuit board is disposed in the control box. A rotary dip switch is disposed at the bottom of the control box. The control circuit board includes a power board, and a control board. The rotary dip switch is electrically connected to the control board. The rotary dip switch controls different functions of the motor.

Abstract: A power supply control device including a power supply and a switching control system. The power supply includes a solar power supply unit and an electric network power supply unit. The solar power supply unit includes solar cells and a DC-DC boosting circuit; an output terminal of the solar cells is connected with an input terminal of the DC-DC boosting circuit and the output terminal of the DC-DC boosting circuit supplies power to the exterior. The electric network power supply unit includes an AC-DC rectifying circuit; an input terminal of the AC-DC rectifying circuit is connected to an electric network alternating current input and an output terminal thereof supplies power to the exterior. A ventilating device using the power supply device is also provided.

Abstract: An overcurrent protection circuit connected between a voltage input and a voltage output of an electronic device to protect against excessive current is disclosed. The overcurrent protection circuit includes first to fifth resistors, a relay comprising a coil and a normally closed switch, a pnp transistor, and a break-over element. When a current between the voltage input and the voltage output is greater or equal to a rated current of the electronic device, the npn transistor is turned on, while the coil is powered on to control the switch to be opened, therefore the voltage output cannot output voltage, which can protect against excessive current damaging the electronic device.

Abstract: A motor, including: a body, including a housing, a stator, and a rotor; and a controller, including a control box, and a control board. The body is disposed at the top of the motor. The controller is disposed at the bottom of the motor. The control board is disposed in the control box. A debug window is disposed on side wall or at the bottom of the control box. A sealing cover is disposed on the debug window. The sealing cover can be opened. The control board can be exposed for wire connection, adjustment of parameters of electronic components, and fixation of a rotating shaft according to requirements of users for installation and use.

Abstract: A motor with a body, including: a housing, a stator, and a rotor; and a controller, including a control box, and a control circuit board. The body is disposed at the top of the motor. The controller is disposed at the bottom of the motor. The control circuit board is disposed in the control box. The control box extends from a side of the housing and forms a platform. A control cable and a power line enter the control box via the platform, and are connected to the control circuit board. The control cable and the power line are sealed via a sealing screw joint and a nut.

Abstract: A computer includes a display assembly, a base, a stand, and a keyboard. The base includes a supporting board and an engaging board. The stand is located on the base supporting the display assembly. The keyboard includes a main body and an extension board extending from the main body. The main body has a key area. The extension board is fixed to the engaging board to help stabilize the display assembly.

Abstract: An AC/DC converting circuit, has a full-bridge rectifier having two input terminals and two output terminals, a first capacitor, a second capacitor, an electronic switch having a control terminal, a trigger circuit having an input terminal and an output terminal, and a detecting circuit having an input terminal and an output terminal.

Abstract: A low voltage warning circuit includes an input terminal configured to receive a supply voltage, a reference voltage connected to the input terminal for providing a reference voltage, a transistor connected to the reference voltage circuit and the input terminal, and a silicon controlled rectifier connected to the transistor and the input terminal via a indicating device, the low voltage warning circuit raise a warning through the indicating device when the supply voltage is below the reference voltage.

Abstract: A connecting device for connecting pins of a DIP chip to a test device comprises two each of half frames, columns of testing pins, connecting screws, fixing screws, and four holding plates. The two columns of testing pins are arranged respectively on the two half frames parallel to the lengthways direction of the half frame. The distance between two adjacent testing pins in the same column is equal to that between the two adjacent pins in the same column of the DIP chip. The two connecting screws screw into the half frames perpendicular to the lengthways direction of the half frame. Two of the holding plates extend down from each of the half frames and are aligned with short sides of the corresponding half frame. The fixing screws fix the two holding plates on the same half frame along a direction parallel to the lengthways direction of the half frame.

Abstract: An electroluminescent display comprising a mask defining the information to be displayed and an electroluminescent (EL) backlight. The mask compress a layer (13) of physically-stabilised liquid crystal switchable to define the information to be displayed mounted in front of an EL layer (16) of the backlight. At least one pair of electrodes (12, 20) are arranged to generate, in use, an electric field across both the EL layer (16) and the LC layer (13). A barrier layer (15) is provided between the LC layer (13) and the EL layer (16) that restricts migration of liquid crystal from the LC layer (13) to the EL layer (16).

Abstract: A temperature control device is used to control a temperature of an electronic component. The temperature control device includes a temperature sensing circuit, a controlled unit, a caution circuit, and a microcontroller. The microcontroller is used to sense the temperature of the electronic component, and determine whether the sensed temperature is higher than a predetermined high temperature stored in the microcontroller. If the sensed temperature is higher than a predetermined high temperature, the microcontroller controls the controlled unit to cool the electronic component and count the number of times the electronic component is cooled. The microcontroller determines whether the count of cooling the electronic component is equal to a predetermined cooling count. If the count of cooling the electronic component is equal to the predetermined cooling count, the microcontroller starts the caution circuit.

Abstract: A regulating system includes an input port having a first input terminal and a second input terminal, an output port having a first output terminal and a second output terminal, a regulating circuit, an over-current protection circuit, and an overvoltage protection circuit. The overvoltage protection circuit includes a regulating diode, a first bipolar transistor and a second bipolar transistor. The first output terminal is connected to the base of the first bipolar transistor via the regulating diode and grounded via first bipolar transistor. A base of the second bipolar transistor connects to the collector of the first bipolar transistor. The second output terminal is grounded via the second transistor.

Abstract: A protecting device includes a power plug, a switch circuit, and a power supply circuit. The switch circuit is connected to the power plug. The power supply circuit is connected to the switch circuit and the power plug. When the temperature of the protecting device is higher than a predetermined temperature, a voltage at a node between a thermo-sensor and a variable resistor is higher than a turn-on voltage of a second electrical switch to turn on the second electrical switch, a first electrical switch is turned off, the power supply circuit is disconnected from the power plug to stop the electronic device from working.