Abstract: A two-terminal current controller regulates a first current flowing through a load, which is coupled in parallel with the two-terminal current controller, according to a voltage established across the two-terminal current controller. When the voltage established across the two-terminal current controller does not exceed a first voltage, the two-terminal current controller conducts a second current related to a rectified AC voltage, thereby limiting the first current to zero and regulating the second current according to the load voltage. When the voltage established across the two-terminal current controller is between the first voltage and a second voltage, the two-terminal current controller conducts the second current, thereby limiting the first current to zero and limiting the second current to a constant value larger than zero. When the voltage established across the two-terminal current controller is greater than second voltage, the two-terminal current controller is turned off.

Abstract: An LED driver circuit that sinks pure DC current through LEDs. According to the invention, a constant current sink circuit is coupled to a full bridge rectifier. The full bridge rectifier includes at least a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm. The first bridge arm and the fourth bridge arm are connected in parallel with the third bridge arm and the second bridge arm in opposite directions, respectively. The connection of the first bridge arm and the third bridge arm and the connection of the second bridge arm and the fourth bridge arm are connected in series. Each of the bridge arms may consist of at least one LED. The constant current sink circuit is used for sinking pure DC current. The LEDs can be driven by pure constant current and can provide desired luminance.

Abstract: A power converter includes an inductor, first through fourth switches, and a control device. The first switch is coupled between a first end of the inductor and ground, the second switch is coupled between an input end and a second end of the inductor, the third switch is coupled between the first end of the inductor and a first output end, and the fourth switch is coupled between the second end of the inductor and a second output end. The control device charges the inductor by turning on the first and second switches. Based on output voltages of the first and second output ends, the control device determines whether the first and second output ends are to be charged or discharged. The second and third switches are turned on for charging the first output end, or the first and fourth switches are turned on for discharging the second output end.

Abstract: An LED driver circuit that sinks pure DC current through LEDs. According to the invention, a constant current sink circuit is coupled to a full bridge rectifier. The full bridge rectifier includes at least a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm. The first bridge arm and the fourth bridge arm are connected in parallel with the third bridge arm and the second bridge arm in opposite directions, respectively. The connection of the first bridge arm and the third bridge arm and the connection of the second bridge arm and the fourth bridge arm are connected in series. Each of the bridge arms may consist of at least one LED. The constant current sink circuit is used for sinking pure DC current. The LEDs can be driven by pure constant current and can provide desired luminance.

Abstract: A power converter includes an inductor, first through fourth switches, and a control device. The first switch is coupled between a first end of the inductor and ground, the second switch is coupled between an input end and a second end of the inductor, the third switch is coupled between the first end of the inductor and a first output end, and the fourth switch is coupled between the second end of the inductor and a second output end. The control device charges the inductor by turning on the first and second switches. Based on output voltages of the first and second output ends, the control device determines whether the first and second output ends are to be charged or discharged. The second and third switches are turned on for charging the first output end, or the first and fourth switches are turned on for discharging the second output end.

Abstract: A driving apparatus for driving a plasma display panel and a method of driving the same are disclosed. The plasma display panel includes multiple display cells, with each of the display cells comprising a sustain electrode, a scan electrode, and a data electrode. Every set of the electrodes has a corresponding driving circuit to provide a required driving waveform for driving the display cell to luminesce. The driving method includes the following steps: first, a first erase pulse, a priming pulse, and a second erase pulse are applied in sequence during a reset period. Then, data pulses corresponding to the display cells are applied during an address period. Lastly, multiple sustain pulses and multiple high frequency driving pulses are applied simultaneously during a sustain period.

Abstract: A driving circuit and method for driving a light-emitting device. The driver circuit includes a first bias circuit coupled to an output node of a first light-emitting device for providing a bias current to the first light-emitting device; and a voltage regulator coupled to an input node of the first light-emitting device and the output node of the first light-emitting device for providing a driving voltage to the first light-emitting device and adjusting the driving voltage according to a voltage level of the output node.

Abstract: A driving apparatus for driving a plasma display panel and a method of driving the same are disclosed. The plasma display panel includes multiple display cells, with each of the display cells comprising a sustain electrode, a scan electrode, and a data electrode. Every set of the electrodes has a corresponding driving circuit to provide a required driving waveform for driving the display cell to luminesce. The driving method includes the following steps: first, a first erase pulse, a priming pulse, and a second erase pulse are applied in sequence during a reset period. Then, data pulses corresponding to the display cells are applied during an address period. Lastly, multiple sustain pulses and multiple high frequency driving pulses are applied simultaneously during a sustain period.