Abstract: A spin mop includes a spiral drive mechanism and a mop head. The spiral drive mechanism includes an upper rod, a sleeve axially secured on the upper rod, a stopper secured in the sleeve, two thread rolling plates positioned in the upper rod, a guide block, a lower rod axially inserted in the upper rod, and a follower secured on a top end of the lower rod. The guide block is placed in between the two thread rolling plates so that the guide block is movable in a spiral direction with respect to the upper rod. The follower is configured to be selectively driven by the guide block so that the follower together with the lower rod is rotatable with the guide block.

Abstract: A spin mop includes a spiral drive mechanism and a mop head. The spiral drive mechanism includes an upper rod, a sleeve axially secured on the upper rod, a stopper secured in the sleeve, two thread rolling plates positioned in the upper rod, a guide block, a lower rod axially inserted in the upper rod, and a follower secured on a top end of the lower rod. The guide block is placed in between the two thread rolling plates so that the guide block is movable in a spiral direction with respect to the upper rod. The follower is configured to be selectively driven by the guide block so that the follower together with the lower rod is rotatable with the guide block.

Abstract: A constant-current and constant-voltage driving circuit of a DC motor is used for driving a first magnetic coil and a second magnetic coil included in the DC motor. The driving circuit includes an integrated circuit chip, a first switch and a second switch. The integrated circuit chip generates currents to drive the first switch and the second switch by using the constant-current driving method. The first switch and the second switch amplify the generated currents by using the constant-voltage driving method, to drive the first magnetic coil and the second magnetic coil, respectively. Furthermore, the driving circuit can also include a control circuit to control the first magnetic coil and the second magnetic coil with pulse width modulation signals, so as to obtain the required rotation frequency of the DC motor.

Abstract: A constant-current driving method and a driving circuit for a DC motor are provided. A DC motor is often used for a DC fan. For a DC motor having two magnetic coils, the constant-current driving method is implemented by employing two control voltage signals to respectively control two semiconductor switches that are respectively connected to the two coils. One terminal of each coil is connected to a same high DC voltage, and one terminal of each semiconductor switch is connected to a same low DC voltage. The two semiconductor switches do not turn on at the same time. When each semiconductor switch is turned on, the current flowing through the coil connected to the switch eventually approaches and remains at a constant value. The constant-current driving method is especially suitable for producing low-rotation-speed and low-current DC motors.

Abstract: A constant-current driving method and a driving circuit for a DC motor are provided. A DC motor is often used for a DC fan. For a DC motor having two magnetic coils, the constant-current driving method is implemented by employing two control voltage signals to respectively control two semiconductor switches that are respectively connected to the two coils. One terminal of each coil is connected to a same high DC voltage, and one terminal of each semiconductor switch is connected to a same low DC voltage. The two semiconductor switches do not turn on at the same time. When each semiconductor switch is turned on, the current flowing through the coil connected to the switch eventually approaches and remains at a constant value. The constant-current driving method is especially suitable for producing low-rotation-speed and low-current DC motors.

Abstract: The object of present invention is to provide a programming switch for non-volatile memory wherein output voltage Vout versus input voltage Vin satisfies the following relations: (1) While Vin is logic "0", Vout is logic "0"; (2) While Vin is logic "1", Vout is about the value of programming voltage Vpp if programming is executed and about the value of supply voltage Vcc if programming is not executed. The present invention is characterized in that it can be utilized in general non-volatile memory and the supply voltage needed can be as low as 2 volts, resulting in body effect almost giving no influence.

Abstract: The present invention provides a security configuration of EEPROM, which is adaptable to a semiconductor integrated circuit. Each byte or minimum cell of the EEPROM is assigned a security bit which corresponds to the same memory cell of EEPROM in a data memory array. Since the security bit can be established inside the memory array, necessary chip area is not increased significantly.

Abstract: A non-volatile memory array includes a plurality of memory cells. Each of the memory cells stores two-bits of data therein and has a threshold voltage corresponding to the data bits stored therein. A voltage providing unit provides a first test voltage to an addressed one of the memory cells. A sensing unit senses whether the addressed one of the memory cells is in a conducting state after the first test voltage has been applied thereto to determine a first bit of data stored therein. When the first bit of data stored in the addressed one of the memory cells is 0, the voltage providing unit provides a second test voltage and the sensing unit senses whether the addressed one of the memory cells is in the conducting state after the second test voltage has been applied thereto to determine a second bit of data stored therein.