Abstract: A method for a broadband modem to process incoming calls. The broadband modem is coupled to a PSTN (public switched telephone network) and a VoIP network. First, an call is incoming by the broadband modem. Then, the broadband modem detects whether the incoming call is routed from the PSTN network or the VoIP network. When the incoming call is routed from the PSTN network, the broadband modem establishes a connection between a telephone coupled to the broadband modem and the PSTN network through a switch. When the incoming call is routed from the VoIP network, the broadband modem establishes a connection between the telephone and the VoIP network through the switch.

Abstract: A firmware upgrade method for a network device through a digital subscriber line. First, the network device transmits a request to a dynamic host configuration protocol server through a digital subscriber line. Then, information comprising a file server address and a query message are transmitted from the dynamic host configuration protocol server through the digital subscriber line to the network device in response to the request. The network device determines whether to upgrade the firmware of the network device according to the answer of the query message. If the network device determines to upgrade the firmware thereof, updated information about the firmware is downloaded from a file server corresponding to the file server address. Finally, the firmware of the digital subscriber line device is upgraded according to the updated information.

Abstract: A multi-lamp system for driving a lamp set having a first lamp and a second lamp comprises a driving circuit for converting a DC signal to an AC signal, a transformer having a primary side coupled to the driving circuit and a secondary side for outputting the AC power, and a current balance circuit coupled to the low voltage terminal of the lamp set for balancing the current values flowing through the first lamp and the second lamp. The current balance circuit comprises a magnetic core, a first winding coupled to the first lamp and a second winding coupled to the second lamp. The first winding and the second winding are wound on the magnetic core and have the same coil number.

Abstract: This invention relates to a power supply that integrates a rectifier/filter's circuitry and a converter's circuitry with an inverter to reduce space occupied and increase power efficiency. The power supply includes: a rectifier/filter, a DC-DC converter and a DC-AC inverter. The rectifier/filter, connected to an alternating current (AC) input terminal, converts the input AC into a direct current (DC). The DC-DC converter and the DC-AC inverter are parallel to each other with one end concurrently connected to the rectifier/filter's output and the other end respectively outputting the desired powers. As such, DC-DC converter reduces the converted DC voltage to lower DC voltages to power all circuits except for the lamp and DC-AC inverter converts the converted DC voltage into higher AC voltage output to drive the lamp.

Abstract: A low voltage detecting circuit includes a first transistor having a first electrode electrically coupled to a reference voltage, a control electrode electrically coupled to the input power voltage, and a second electrode. The low voltage detecting circuit also has a second transistor having a first electrode electrically coupled to a logic high voltage, a control electrode electrically coupled to the second electrode of the first transistor, and a second electrode electrically coupled to a logic low voltage. When the input power voltage drops below the predetermined voltage, the voltage at the control electrode of the first transistor drops below the reference voltage to turn on the first transistor and consequently the second transistor so that a logic low signal is output from the first electrode of the second transistor.

Abstract: A transformer for an inverter circuit, comprising: a core module having a first core portion and a second core portion; a first bobbin having a first coiled portion and a first hollow portion for receiving the first core portion; a second bobbin substantially disposed parallel to the first bobbin, the second bobbin having a second coiled portion and a second hollow portion for receiving the second core portion; primary coils wound around the first coiled portion; and secondary coils wound around the second coiled portion.

Abstract: A DC to DC converter having a simplified logic circuit with both zero voltage switch function and synchronous rectification function, including a transformer having a primary coil and a second coil, a first half-bridge switch coupled to one end of the primary coil, a second half-bridge switch coupled to the other end of the primary coil, a first synchronous rectifier coupled to one end of the second coil, a second synchronous rectifier coupled to the other end of the second coil. The switching between the first half-bridge switch and the second half-bridge switch is made through the leakage inductance of the transformer and the open of the first synchronous rectifier and the second synchronous rectifier is made by the coil resistance of the transformer.

Abstract: This invention relates to a power supply that integrates a rectifier/filter's circuitry and a converter's circuitry with an inverter to reduce space occupied and increase power efficiency. The power supply includes: a rectifier/filter, a DC-DC converter and a DC-AC inverter. The rectifier/filter, connected to an alternating current (AC) input terminal, converts the input AC into a direct current (DC). The DC-DC converter and the DC-AC inverter are parallel to each other with one end concurrently connected to the rectifier/filter's output and the other end respectively outputting the desired powers. As such, DC-DC converter reduces the converted DC voltage to lower DC voltages to power all circuits except for the lamp and DC-AC inverter converts the converted DC voltage into higher AC voltage output to drive the lamp.

Abstract: A system for driving a plurality of lamps is disclosed to balance currents flowing through the lamps by means of impedance matching. According to the multi-lamp driving system of the present invention, a balancing controller is employed to match the impedance of each lamp path so as to regulate currents flowing through the lamps to be substantially the same.

Abstract: A back lighting source module for a liquid crystal display comprises a pulse width modulation (PWM) controller for providing a pulse width signal to control output current of a lighting element. A half bridge converter includes two power transistors connected in series. An output is formed in a middle between the two power transistors. The output is controllable by the signal from the PWM controller to perform alternating opening and closing. A resonance circuit generates a sine-wave voltage to empower the lighting element. A feedback circuit includes a resistor. When a load varies, a voltage signal generated between two ends of the resistor of the feedback circuit timely changes a conductive time of the power transistors of the half bridge converter to complete regulation of current passing through the lighting element.

Abstract: A transformer for an inverter circuit, comprising: a core module having a first core portion and a second core portion; a first bobbin having a first coiled portion and a first hollow portion for receiving the first core portion; a second bobbin substantially disposed parallel to the first bobbin, the second bobbin having a second coiled portion and a second hollow portion for receiving the second core portion; primary coils wound around the first coiled portion; and secondary coils wound around the second coiled portion.

Abstract: A multi-lamp system for driving a lamp set having a first lamp and a second lamp comprises a driving circuit for converting a DC signal to an AC signal, a transformer having a primary side coupled to the driving circuit and a secondary side for outputting the AC power, and a current balance circuit coupled to the low voltage terminal of the lamp set for balancing the current values flowing through the first lamp and the second lamp. The current balance circuit comprises a magnetic core, a first winding coupled to the first lamp and a second winding coupled to the second lamp. The first winding and the second winding are wound on the magnetic core and have the same coil number.

Abstract: The present invention relates to a driving system for multiple lamps, which comprises a plurality of lamps including one master lamp and at least one slave lamp, an inverter circuit for converting DC power to AC power to be supplied to said plurality of lamps, and at least one current balancing circuit having an impedance device coupled to each of the slave lamp, so that the equivalent impedance varies with the current values of said master lamp and each of said slave lamps to thereby balance the currents in said master slave lamps.

Abstract: An electronic stabilizer with single stage conversion includes a push-pull resonant stage, a synchronous pulse width modulation controller, and a converter. The push-pull resonant stage includes a high frequency transformer and transistors to form an alternating voltage-increasing loop that operates under self-activating oscillation, the high frequency transformer including a secondary winding for driving a lamp. The synchronous pulse width modulation controller samples signals from the lamp and feeds back to control a power input for the lamp. The converter includes transistors to form a dynamic resistance that allows current to flow in both directions. The converter includes an input end that is electrically connected to an output end of the synchronous pulse width modulation controller. The converter further includes an output end that is electrically connected in series to the secondary winding of the high frequency transformer and in series connection with the lamp.