Abstract: A charge control system for lithium battery using pulse width modulation is provided, and it detects the existing voltage of the charging lithium battery by a voltage detector and passes this voltage value to a microprocessor preset in the hand-held apparatus. Thus, the microprocessor can decide the applicable charge stage and confirm the status of the charging battery depending on the different Voltage values in real time. Next, the microprocessor controls a control unit by a pulse width modulation signal to modulate the power-source, which comes from an adaptor, as a constant current or a constant voltage to charge the battery. Accordingly, the charge process is completed by repeating the voltage detection and the duty cycle modulation of the control unit.

Abstract: A charging control method of lithium battery is provided. At the beginning, a voltage detect circuit detects the current voltage of the battery and the microprocessor decides a proper charging stage, and then modulates a power as an appropriate constant current or an appropriate constant voltage by the pulse width modulation (PWM) function of the microprocessor to charge the battery. Next, repeatedly detects the voltage, decides the charging stage, charges the battery, compares the voltage of the battery with the default voltage . . . and so on until the charging process is completed.

Abstract: A charging control system for lithium battery is provided, and it detects the existing voltage of the charging lithium battery by a voltage detector and passes this voltage value to a microprocessor preset in the hand-held apparatus. Thus, the microprocessor can decide the applicable charge stage and confirm the status of the charging battery depending on the different voltage values in real time. Next, the microprocessor controls a control unit by a pulse width modulation signal to modulate the power-source, which comes from an adaptor, as a constant current or a constant voltage to charge the battery. Accordingly, the charge process is completed by repeating the voltage detection and the duty cycle modulation of the control unit.

Abstract: The wireless communication apparatus includes a blue tooth wireless earphone that can be operated independently and a network phone base. The blue tooth wireless earphone is embedded into the network phone base. When the blue tooth wireless earphone is used independently, a voice is inputted and outputted via a microphone and a loudspeaker of the blue tooth wireless earphone, respectively. Once the blue tooth wireless earphone is used in combination with the network phone base, the voice is inputted and outputted via a microphone and a loudspeaker of the network phone base. The blue tooth wireless earphone is also used independently to be connected to a blue tooth mobile phone, a PDA, etc. Furthermore, by being connected to an external apparatus through a USB interface, the blue tooth wireless earphone is charged by the network phone base, and such a design is also applicable in a hands-free car earphone.

Abstract: The present invention relates to a device and a method of temperature control for an optical storage and retrieving apparatus. When the internal temperature of the optical storage and retrieving apparatus reaches a predetermined temperature, the temperature control device is able to bid the optical storage and retrieving apparatus steadily retrieve data by lowering the rate of a carry device of the optical storage and retrieving apparatus, or by instructing a servo control device to lower the tracking loop gain, or by lowering the velocity and the braking slope of a data read/write device of the optical storage and retrieving apparatus.

Abstract: The present invention relates to a method for adjusting the rotating speed of a compact disc drive to prevent unwanted vibrations of a compact disc rotating within. The compact disc drive comprises a reading head for reading data stored in a track of the compact disc and generating a data signal and a track signal; a rotating driver for driving the compact disc; a speed control circuit for controlling the rotating speed of the rotating driver; a track driver for moving the reading head along a diameter of the compact disc; a track driving circuit for controlling the track driver; and a track servo circuit for controlling the track driving circuit according to the track signal generated by the reading head and a track correction gain so that the track driver can move the reading head along the diameter of the compact disc along its track.