Abstract: A full bridge inverter includes a push/pull control chip outputting a first control signal and a second control signal. Each duty cycle of the two control signals is smaller than 50%. Moreover, both a first driver and a second driver are coupled to the push/pull control chip and a DC power. A full bridge switch assembly with four N-MOSes couples to the DC power, the first driver, the second driver and a transformer, and converts the DC power into an AC power by the first driver and the second driver. The AC power is transmitted to a first side of the transformer.

Abstract: A multi-lamp backlight module integrates the capacitors into a circuit board, and the circuit board is located on the liquid crystal display panel. The backlight module includes a driving unit having a driving transformer, and a backlight unit. The driving transformer provides two output terminals. The backlight unit includes a circuit board and at least one CCFL. The circuit board is located at the liquid crystal display panel. The circuit board has at least one capacitor, and first ends of the capacitors are commonly connected with one output terminal of the driving transformer. The CCFLs are located on a back side of the liquid crystal display panel. First ends of the CCFLs are commonly connected with another output terminal of the driving transformer, and second ends of the CCFLs are respectively connected with the second ends of the capacitors.

Abstract: The present invention discloses a current-balancing apparatus for lamps. The current-balancing apparatus includes a first transformer, a second transformer and a third transformer, and every transformer has a primary winding and a secondary winding. The current-balancing apparatus balances the current flowing through every lamp in response to the connection of those transformers and the electromagnetic induction of Runge-Lenz Theorem. The two side windings of the first transformer connect to a power stage via a first lamp and a second lamp respectively. The two side windings of the second transformer connect to the power stage via a third lamp and a fourth lamp respectively. The primary winding of the third transformer connects to the two side windings of the first transformer and the secondary winding of the third transformer connects to the two side windings of the second transformer.

Abstract: A full bridge driver includes a control chip outputting a first control signal and a second control signal, a full bridge switch assembly with four N-MOSs coupled to a DC power, a first side of a transformer, and two drivers. Moreover, one of the two drivers includes a first cut-off switch that turns off the first N-MOS in response to the first control signal, a first charging path coupled between the DC power and the second N-MOS, a first discharging path coupled between the gate end and the source end of the first N-MOS. Furthermore, another one of the two drivers includes a second cut-off switch that turns off the third N-MOS in response to the second control signal, a second charging path coupled between the DC power and the fourth N-MOS, and a second discharging path coupled between the gate end and the source end of the third N-MOS.

Abstract: A half bridge inverter includes a push/pull control chip outputting a first control signal and a second control signal. Each duty cycle of the two control signals is smaller than 50%. Moreover, both a first buffer circuit and a second buffer circuit are coupled to the push/pull control chip. A driver couples to the first buffer circuit through the push/pull control chip and couples to a DC power for receiving the first control signal. A half bridge switch assembly with two N-MOSes couples to the DC power, the driver, the second buffer circuit and a transformer, and converts the DC power into an AC power by the driver. The AC power is transmitted to a first side of the transformer.

Abstract: A structure for high voltage bearable transformers is used to electrically connect with backlight driving circuits of liquid crystal display devices. The structure for high voltage bearable transformers is comprised of at least one main bobbin, at least two sets of primary windings, and at least one set of secondary windings. The main bobbin is divided into a primary bobbin and a secondary bobbin. The primary windings are wound on the primary bobbin. The secondary windings are wound on the secondary bobbin. The structure of the high voltage bearable transformer has a tolerance for high voltage, and may connect to several driving units to export several high voltage outputs for driving cold-cathode fluorescent lamps simultaneously.

Abstract: A half bridge inverter with dual N-MOS includes a push/pull control chip outputting a first control signal with a duty cycle greater than 50% and a second control signal with a duty cycle greater than 50%. Moreover, both a first buffer circuit and a second buffer circuit are coupled to the push/pull control chip. A driver couples to the push/pull control chip through the first buffer circuit for receiving the first control signal, and couples to a DC power. A half bridge switch assembly with two N-MOSes couples to the DC power, the driver, the second buffer circuit and a transformer, and converts the DC power into an AC power by the driver. The AC power is transmitted to a first side of the transformer.

Abstract: A full bridge inverter includes a push/pull control chip outputting a first control signal and a second control signal. Each duty cycle of the two control signals is smaller than 50%. Moreover, both a first driver and a second driver are coupled to the push/pull control chip and a DC power. A full bridge switch assembly with four N-MOSes couples to the DC power, the first driver, the second driver and a transformer, and converts the DC power into an AC power by the first driver and the second driver. The AC power is transmitted to a first side of the transformer.

Abstract: A half bridge inverter with dual N-MOS includes a push/pull control chip outputting a first control signal with a duty cycle greater than 50% and a second control signal with a duty cycle greater than 50%. Moreover, both a first buffer circuit and a second buffer circuit are coupled to the push/pull control chip. A driver couples to the push/pull control chip through the first buffer circuit for receiving the first control signal, and couples to a DC power. A half bridge switch assembly with two N-MOSes couples to the DC power, the driver, the second buffer circuit and a transformer, and converts the DC power into an AC power by the driver. The AC power is transmitted to a first side of the transformer.

Abstract: A half bridge inverter includes a push/pull control chip outputting a first control signal and a second control signal. Each duty cycle of the two control signals is smaller than 50%. Moreover, both a first buffer circuit and a second buffer circuit are coupled to the push/pull control chip. A driver couples to the first buffer circuit through the push/pull control chip and couples to a DC power for receiving the first control signal. A half bridge switch assembly with two N-MOSes couples to the DC power, the driver, the second buffer circuit and a transformer, and converts the DC power into an AC power by the driver. The AC power is transmitted to a first side of the transformer.

Abstract: A high voltage transformer for controlling inductance leakage used for a multiple lamp driving system includes at least one wire frame, a first winding, a second winding, a first magnetic unit, and a second magnetic unit. There is a receiving space in the wire frame for receiving the first magnetic unit, and a first region and a second region is formed on its surface. The first winding and the second winding are individually wound at the first region and the second region. The second magnetic unit is covered on the side of the wire frame. On an appropriate location of the bottom of the second magnetic unit, a transverse beam extends. Thereby, the transverse beam fully separates the low voltage magnetic flux path produced on the first magnetic unit by the first winding and the second winding and the high voltage magnetic flux path produced by the AC.

Abstract: A high voltage transformer for controlling inductance leakage used for a multiple lamp driving system includes at least one wire frame, a first winding, a second winding, a first magnetic unit, and a second magnetic unit. There is a receiving space in the wire frame for receiving the first magnetic unit, and a first region and a second region is formed on its surface. The first winding and the second winding are individually wound at the first region and the second region. The second magnetic unit is covered on the side of the wire frame. On an appropriate location of the bottom of the second magnetic unit, a transverse beam extends. Thereby, the transverse beam fully separates the low voltage magnetic flux path produced on the first magnetic unit by the first winding and the second winding and the high voltage magnetic flux path produced by the AC.

Abstract: A structure for high voltage bearable transformers is used to electrically connect with backlight driving circuits of liquid crystal display devices. The structure for high voltage bearable transformers is comprised of at least one main bobbin, at least two sets of primary windings, and at least one set of secondary windings. The main bobbin is divided into a primary bobbin and a secondary bobbin. The primary windings are wound on the primary bobbin. The secondary windings are wound on the secondary bobbin. The structure of the high voltage bearable transformer has a tolerance for high voltage, and may connect to several driving units to export several high voltage outputs for driving cold-cathode fluorescent lamps simultaneously.

Abstract: A transformer having a closed magnetic flux path includes at least one bobbin, at least one first winding, at least one second winding, and at least two magnetic cores. The first winding and the second winding are individually wound on the bobbin. The two magnetic cores include an I-shaped magnetic core and an E-shaped magnetic core piercing the inner part of the bobbin to form a closed magnetic flux path in the transformer. When one of the first windings is damaged, the other first winding still operates normally and is unaffected.

Abstract: A lamp driving system controlled by electrical isolating is provided. The front-end power stage and the back-end power stage of the lamp driving system are electrically isolated each other by an electrical isolator. The lamp driving system includes a PFC controller for outputting a high voltage into a switching circuit. The switching circuit outputs a lamp driving voltage into the primary side of a boost transformer. A loading resonant network couples to the secondary side of the boost transformer, and generates a feedback signal. There are having the primary side of the electrical isolator, the PFC controller, the switching circuit and boost transformer coupled to a primary ground end. The PFC controller, the loading resonant network and the secondary side of the electrical isolator are coupled to a secondary ground end.

Abstract: A half bridge driver includes a push/pull control chip outputting a first control signal and a second control signal. Each duty cycle of the two control signals is smaller than 50%. A driver couples to the push/pull control chip and a DC power for receiving the first control signal and the second control signal. A half bridge switch assembly with two N-MOSes couples to the DC power, the driver and a transformer, and converts the DC power into an AC power by the driver. The AC power is transmitted to a first side of the transformer.

Abstract: The invention describes a multiple lamp balance transformer and a drive circuit. The multiple lamp balance transformer has two magnetic cores with a closed magnetic flux path and two coils wound around the closed magnetic flux path. The two coils have the same number of windings. The impedance property of the coil and Lenz's Law are used to balance the operating current of the lamps connected to the coils. The drive circuit has a multiple lamp balance transformer connected to several lamps, and a boost transformer uses a controller to supply the current and voltage to the lamps. A current detect/protect circuit connected to the coils and the controller detects the current passing through the coils and converts the operating current of the lamp into a voltage to be sent to the controller, so that the controller controls and provides sufficient power to the lamps.

Abstract: A full bridge inverter with a push/pull control chip uses two similar drivers to connect to the prior art full bridge switch assembly, and controls the prior art full bridge switch assembly with the push/pull control chip. The full bridge inverter comprises a push/pull control chip with two output terminals. Two drivers both have an input terminal and an output terminal. The input terminal is connected to the output terminals of the push/pull control chip and a full bridge switch assembly with four electronic switches. Each electronic switch has a control terminal connected to the output terminal of the two drivers so as to convert DC power into AC power by the two drivers.

Abstract: A power transformer combined with balance windings is used for driving a CCFL. The power transformer makes use of a ferrite core structure to achieve a closed magnetic circuit, and is combined with balance windings. When used in application circuits, the power transformer combined with balance windings can provide stable induction voltages and balance load currents to CCFLs to enhance the luminous efficiency and uniformity of the CCFLs, thereby improving the drawbacks of a irregular current flowing through the CCFLs and too high a manufacturing cost of conventional CCFL application circuits.

Abstract: A synchronous double-frequency signal generating device includes an integration switching unit controlled by a scan synchronous signal; a first integration unit connected to the integration switching unit for outputting a first integration signal when the scan synchronous signal is at high level; a second integration unit connected to the integration switching unit for outputting a second integration signal when the scan synchronous signal is at low level; an addition unit connected to the first integration unit and the second integration unit for adding up the first integration signal and the second integration signal so as to output a double-frequency modulation signal; and a comparison unit connected to the addition unit for comparing the double-frequency modulation signal with a reference signal so as to output the synchronous double-frequency signal.