Abstract: The present invention provides a charging mode control circuit and method. By utilizing such charging mode control circuit and method, a secondary battery fixed in a portable device can be quickly charged when the portable device communicate with an external computer. The method includes the steps of: a) providing a commutator, the commutator comprising an adapter, a first interface, and a second interface, wherein the first interface is connected to the external computer and the second interface is connected to the portable device; b) filtering a charging voltage from the adapter and obtaining a ripple voltage from the charging power supply; c) rectifying the ripple voltage; d) comparing the rectified ripple voltage with a reference voltage, thereby producing a voltage waveform according to a comparison result; and e) selecting a fast charging mode on the secondary battery according to the voltage waveform.

Abstract: An interface switching apparatus (40) switches to receive input from a plurality of electronic devices. In an exemplary embodiment, the apparatus includes a receiving unit (44) equipped with a plurality of input ports (441), each for connecting with an electronic device; a detecting unit (45) for detecting new input from any of the input ports; a switching unit (47) for switching the interface switching apparatus so that the interface switching apparatus halts receiving current input from one of the input ports and receives new input from another input port detected to have the new input; a signal converting unit (48) for converting the new input into an information signal having a format that can be received by a display device (30), and an output port (491) for transmitting the information signal to the display device. Related methods are also provided.

Abstract: A signal conveying apparatus (20) connects with a power supply unit (10) and a display device (30). The signal conveying apparatus includes a plurality of input interfaces (221), a signal converting unit (24), and an output interface (261). The input interfaces receive signals from external electronic devices. The signal converting unit integrates and converts the signals received by the input interfaces to a format that can be received by the display device. The output interface receives the converted signals from the signal converting unit and outputs the converted signals to the display device.

Abstract: A CCFL (cold-cathode fluorescent lamp) driving system for multiple CCFL loads includes a transformer, a CCFL circuit, and a controlling circuit coupled between the transformer and the CCFL circuit. The CCFL circuit includes multiple CCFL loads. The transformer includes a primary winding and a secondary winding, with the primary winding coupled to a voltage source and the secondary winding coupled to the CCFL loads. The controlling circuit includes a part for generating a predetermined voltage signal to power the CCFL loads during a warm-up stage and another part for generating a modulation signal. With such circuit arrangement, each of the multiple CCFL loads is powered from an off state to an operationally-on state.