Abstract: A device that is capable of eliminating a power trace that can be analyzed in a power analysis attack and serves as a highly effective countermeasure against power analysis attacks. The device comprising an optical source providing optical energy to an integrated circuit. An optical detector optically linked to the optical source and converts the optical energy from the optical source into electrical energy to power a secure circuit.

Abstract: A device that is capable of eliminating a power trace that can be analyzed in a power analysis attack and serves as a highly effective countermeasure against power analysis attacks. The device comprising an optical source providing optical energy to an integrated circuit. An optical detector optically linked to the optical source and converts the optical energy from the optical source into electrical energy to power a secure circuit.

Abstract: A device that is capable of eliminating a power trace that can be analyzed in a power analysis attack and serves as a highly effective countermeasure against power analysis attacks. The device comprising an optical source providing optical energy to an integrated circuit. An optical detector optically linked to the optical source and converts the optical energy from the optical source into electrical energy to power a secure circuit.

Abstract: A device that is capable of eliminating a power trace that can be analyzed in a power analysis attack and serves as a highly effective countermeasure against power analysis attacks. The device comprising an optical source providing optical energy to an integrated circuit. An optical detector optically linked to the optical source and converts the optical energy from the optical source into electrical energy to power a secure circuit.

Abstract: A fluid generating device and an electric apparatus utilizing the fluid generating device are provided. The fluid generating device includes a motor and an impeller driven by the motor. The motor is a single phase direct current brushless motor which includes a stator and a rotor. The stator includes a stator core and a stator winding. The stator core includes an outer ring portion, teeth extending inwardly from the outer ring portion, a pole shoe formed at the tooth. Slot openings are formed between the pole shoes. The rotor is received in a receiving chamber defined by the pole shoes. Inner surfaces of the pole shoes and the rotor form therebetween a substantially even air gap. The presence of even air gap can reduce the cogging torque of the motor, thus reducing the startup current and noise of the motor.

Abstract: A fluid generating device and an electric apparatus utilizing the fluid generating device are provided. The fluid generating device includes a motor and an impeller driven by the motor. The motor is a single phase direct current brushless motor which includes a stator and a rotor. The stator includes a stator core and a stator winding. The stator core includes an outer ring portion, teeth extending inwardly from the outer ring portion, a pole shoe formed at the tooth. Slot openings are formed between the pole shoes. The rotor is received in a receiving chamber defined by the pole shoes. Inner surfaces of the pole shoes and the rotor form therebetween a substantially even air gap. The presence of even air gap can reduce the cogging torque of the motor, thus reducing the startup current and noise of the motor.

Abstract: A power tool includes a main body and a working portion. The working portion is rotatably coupled to the main body. A single phase brushless motor is mounted in the main body to drive the working portion to rotate bidirectionally. In comparison with a traditional motor, the single phase brushless motor make the power tool has a reduced size and reduced cost while ensuring the stable performance.

Abstract: A single-phase motor, an airflow generating apparatus, and an electric apparatus are provided. The motor includes a stator and a rotor. The stator includes a stator core and stator windings. The stator core includes a ring-shaped yoke and multiple pole portions. A magnetic bridge or slot opening is formed between each two adjacent pole portions. An end surface of each pole portion includes an arc surface. A positioning groove is formed in each arc surface. The arc surfaces of the pole portions cooperatively form a receiving cavity. The rotor includes a rotary shaft and a permanent magnet fixed to the rotary shaft. The permanent magnet is received in the receiving cavity. The arc surfaces are located on a cylindrical surface centered around a rotation axis of the rotary shaft. The cogging torque of the motor can be reduced, thus reducing the startup current and hence the noise of the motor.

Abstract: The present invention includes a digital controller for use with an ultrasound power amplifier circuit to increase linearity and efficiency of the ultrasound power amplifier circuit. The digital controller includes a digital signal generator and a memory unit that is coupled to the digital signal generator. The memory unit includes a processor that obtains an output signal from the ultrasound power amplifier circuit, calculates error by obtaining a difference between an ideal output signal and the output signal that is obtained from the ultrasound power amplifier circuit, and equalizes an input signal from the digital signal generator to reduce nonlinearity in the output signal of the ultrasound power amplifier circuit. The memory unit includes a look-up-table for storing values of error.

Abstract: An actuator for controlling an air damper includes a motor, an output connector for connecting the actuator to the air damper, a transmission mechanism connecting the motor to the output connector, and an energy storage device that drives the output connector to close the air damper when power to the motor is cut off. The motor has a stator and a rotor. The stator has a stator core including a yoke and nine poles extending from the yoke. The rotor has a shaft and an annular permanent magnet. The magnet forms twelve poles with alternate N and S polarities. An inclination angle of boundaries between adjacent poles of the magnet relative to an axis of the motor is in the range of 13 to 17 degrees.

Abstract: A universal motor has a stator and a rotor installed in the stator. The stator comprises a pair of stator segments. Each segment has a yoke with first and second ends, a pole and a neck connecting the pole to the first end of the yoke. The second end of each yoke is connected with the first end of the other yoke. A pair of pre-formed windings are mounted on respective poles of the stator segments.

Abstract: A universal motor has a stator and a rotor installed in the stator. The stator comprises a pair of stator segments. Each segment has a yoke with first and second ends, a pole and a neck connecting the pole to the first end of the yoke. The second end of each yoke is connected with the first end of the other yoke. A pair of pre-formed windings are mounted on respective poles of the stator segments.