Abstract: An active current regulator circuit. In one embodiment, the active current regulator circuit includes a first input node for receiving a first reference electrical signal, a second input node for receiving a second reference electrical signal, a ground node, and an output node for outputting an output electrical signal with respect to the ground node. The active current regulator circuit further includes a PI controller having a first input node, a second input node, and an output node, and a linear regulator having a first input node electrically coupled to the output of the PI controller for receiving a voltage signal V0 generated the PI controller, a first output node and a second output node. In operation the voltage signal V0 is responsive to at least one input voltage signal applied to the first input of the second input of the amplifier, and drives the linear regulator to have a controlled electrical signal at its first output node accordingly.

Abstract: The present invention uses one or more transformers disposed between an inverter driver to drive a plurality of lamps. Each transformer has a first coil and a second coil magnetically coupled to each other. Each of the first and second coils has an input end and an output end. The input end of the first coil is operatively connected to the input end of the second coil for receiving an input current. Each of the first and second coils has a capacitor connected between the input and output ends. The output ends of the first and second coils are used to provide output current in two separate current paths. As such, the output end of a transformer can be separately connected to the input end of two lamps or two such transformers.

Abstract: A driver and method for driving a semiconductor light emitting device array is provided. The driver includes at least one current regulator unit having a plurality of controllable switches to regulate the current of each set of cascaded light emitting devices in the semiconductor light emitting device array. The currents of the sets are used to generate a plurality of feedback signals through a feedback unit. A compensation unit generates a plurality of control signals in response to the feedback signals and a plurality of timing signals, so as to control the controllable switches. A driver according to the present invention can independently and individually control the luminance and timing of each set of cascaded light emitting devices.

Abstract: A lamp driving device for driving a lamp. A feedback circuit includes a voltage falling unit and a rectification circuit. The voltage falling unit provides a low voltage signal in response to a first DC power signal, a first AC power signal or a first driving power signal. The rectification circuit rectifies the low voltage signal to generate a feedback signal. The rectification circuit provides the feedback signal. A controller provides a control signal in response to the feedback signal. A first DC-to-AC converter transforms the first DC power signal to the first AC power signal in response to the control signal. A first voltage raising unit raises the voltage of the first AC power signal to generate the first driving power signal. The first raising unit provides the first driving power signal to a first end of the lamp, so that the lamp achieves the desired brightness stably.

Abstract: An active current regulator circuit. In one embodiment, the active current regulator circuit includes a first input node for receiving a first reference electrical signal, a second input node for receiving a second reference electrical signal, a ground node, and an output node for outputting an output electrical signal with respect to the ground node. The active current regulator circuit further includes a PI controller having a first input node, a second input node, and an output node, and a linear regulator having a first input node electrically coupled to the output of the PI controller for receiving a voltage signal V0 generated the PI controller, a first output node and a second output node. In operation the voltage signal V0 is responsive to at least one input voltage signal applied to the first input of the second input of the amplifier, and drives the linear regulator to have a controlled electrical signal at its first output node accordingly.

Abstract: A lamp drive circuit used for driving a number of lamps is provided. The lamps are used in the backlight module. The backlight module is used for providing a light source during a liquid crystal display displays. The lamps are respectively electrically connected to a coil is. The coils substantially have the same coil turns and have the same magnetic circuit, so that the currents flowing through the lamps are balanced.

Abstract: The present invention uses one or more transformers disposed between an inverter driver to drive a plurality of lamps. Each transformer has a first coil and a second coil magnetically coupled to each other. Each of the first and second coils has an input end and an output end. The input end of the first coil is operatively connected to the input end of the second coil for receiving an input current. Each of the first and second coils has a capacitor connected between the input and output ends. The output ends of the first and second coils are used to provide output current in two separate current paths. As such, the output end of a transformer can be separately connected to the input end of two lamps or two such transformers.

Abstract: A liquid crystal display (LCD) including a light emitting diode (LED) driving circuit and an LED module is provided. The LED module includes a plurality of LEDs. The LED driving circuit includes a transformer, a rectification circuit and a filter circuit. The transformer is used for outputting an AC voltage. The alternate current voltage is respectively rectified and filtered by the rectification circuit and the filter circuit, and then a direct current (DC) voltage level necessary for driving the LEDs is outputted accordingly.

Abstract: A floating driving device for illumination includes a illumination unit having a first terminal and a second terminal. A first driver is electrically coupled to the first terminal of the illumination unit, for applying AC voltages to the first terminal. A second driver is electrically coupled to the second terminal of the illumination unit, for applying AC voltages to the second terminal in such a manner that the AC voltages at the first terminal and the second terminal are out of phase.

Abstract: A lamp driving device for driving a lamp. A feedback circuit includes a voltage falling unit and a rectification circuit. The voltage falling unit provides a low voltage signal in response to a first DC power signal, a first AC power signal or a first driving power signal. The rectification circuit rectifies the low voltage signal to generate a feedback signal. The rectification circuit provides the feedback signal. A controller provides a control signal in response to the feedback signal. A first DC-to-AC converter transforms the first DC power signal to the first AC power signal in response to the control signal. A first voltage raising unit raises the voltage of the first AC power signal to generate the first driving power signal. The first raising unit provides the first driving power signal to a first end of the lamp, so that the lamp achieves the desired brightness stably.