Patent application number | Description | Published |
20120139448 | TWO-TERMINAL CURRENT CONTROLLER AND RELATED LED LIGHTING DEVICE - A two-terminal current controller having a current limiting unit and an adjusting unit regulates a first current flowing through a load according to a load voltage. When the load voltage does not exceed a first voltage, the two-terminal current controller operates in a first mode for conducting a second current associated a rectified AC voltage, thereby limiting the first current to zero and adjusting the second current accordingly. When the load voltage is between the first voltage and a second voltage, the two-terminal current controller operates in a second mode for conducting the second current, thereby limiting the first current to zero and limiting the second current to a constant value larger than zero. When the load voltage exceeds the second voltage, the two-terminal current controller operates in a third mode for turning off the current limiting unit. The adjusting unit can adjust the predetermined value and the second voltage. | 06-07-2012 |
20120262090 | TWO-TERMINAL CURRENT CONTROLLER AND RELATED LED LIGHTING DEVICE - 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. | 10-18-2012 |
20120300518 | TWO-TERMINAL CURRENT CONTROLLER AND RELATED LED LIGHTING DEVICE - A two-terminal current controller controls a first current flowing through a parallel-coupled load. During a rising period of a rectified AC voltage, when a load voltage does not exceed a first voltage, the two-terminal current controller operates in a first mode. When the load voltage exceeds the first voltage but does not exceed a second voltage, the two-terminal current controller operates in a second mode. When the load voltage exceeds the second voltage, the two-terminal current controller operates in a third mode. When the load voltage drops to a third voltage smaller than the second voltage after exceeding the second voltage, the two-terminal current controller operates in the second mode when a difference between the second and third voltages exceeds a hysteresis band and operates in the third mode when a difference between the second and third voltages does not exceed the hysteresis band. | 11-29-2012 |
20120306393 | TWO-TERMINAL CURRENT CONTROLLER AND RELATED LED LIGHTING DEVICE - An LED lighting device includes a first luminescent device for providing light according to a first current, a second luminescent device coupled in series to the first luminescent device for providing light according to a second current, an impedance device for limiting the second current within a predetermined range when a voltage established across the first luminescent device and the second luminescent device exceeds a first predetermined value, and a two-terminal current controller coupled in parallel with the first luminescent device and in series to the second luminescent device and configured to regulate the second current according to a voltage established across the two-terminal current controller. | 12-06-2012 |
20130002158 | TWO-TERMINAL CURRENT CONTROLLER AND RELATED LED LIGHTING DEVICE - An LED lighting device includes a first luminescent device for providing light according to a first current, a second luminescent device coupled in series to the first luminescent device for providing light according to a second current, a silicon-controlled rectifier coupled in parallel to the first luminescent device and configured to conduct a third current when a voltage established across the first luminescent device exceeds a break-over voltage, and a two-terminal current controller coupled in parallel with the first luminescent device and in series to the second luminescent device and configured to regulate the second current according to a voltage established across the two-terminal current controller. | 01-03-2013 |
20130127354 | TWO-TERMINAL CURRENT CONTROLLER AND RELATED LED LIGHTING DEVICE - A two-terminal current controller having a current limiting unit and an adjusting unit regulates a first current flowing through a load according to a load voltage. When the load voltage does not exceed a first voltage, the two-terminal current controller operates in a first mode for conducting a second current associated a rectified AC voltage, thereby limiting the first current to zero and adjusting the second current accordingly. When the load voltage is between the first voltage and a second voltage, the two-terminal current controller operates in a second mode for conducting the second current, thereby limiting the first current to zero and limiting the second current to a constant value larger than zero. When the load voltage exceeds the second voltage, the two-terminal current controller operates in a third mode for turning off the current limiting unit. The adjusting unit can adjust the predetermined value and the second voltage. | 05-23-2013 |
20140028193 | LIGHT SOURCE DIMMING CONTROL CIRCUIT - The present invention provides a light source dimming control circuit, which includes a voltage signal generator for generating a first voltage signal between a predetermined voltage level and a ground level; a reference voltage signal generator for generating a reference voltage signal at an output end according to the first voltage signal and a second voltage signal; a first switch with a first end coupled to an output end of alight source; a first resistor with a first end coupled to a second end of the first switch, and a second end coupled to a ground end; a switch controller coupled to the first switch and the voltage signal generator for controlling on/off states of the first switch according to a sawtooth signal and the first voltage signal; and a current controller for controlling current flowing through the first resistor according to the reference voltage signal. | 01-30-2014 |
20140035471 | CURRENT DISTRIBUTOR - A current distributor includes a plurality of current adjustment units and a reference voltage adjustment unit. The plurality of current adjustment units is for distributing currents flowing through plural sets of light emitting diodes. The reference voltage adjustment unit is coupled to the plurality of current adjustment units for controlling the plurality of current adjustment units according to a reference voltage. | 02-06-2014 |
20140097754 | LIGHT EMITTING DIODE LUMINANCE SYSTEM HAVING CLAMPING DEVICE - A light emitting diode luminance system includes a first power source, a voltage divider, a first switch, a clamping device, a plurality of current sources and a feedback circuit. The voltage divider is coupled to the first voltage source. The first switch is coupled to the voltage divider and a ground. The clamping device includes a plurality of transistors each coupled to a respective set of light emitting diodes and the voltage divider. The plurality of current sources is coupled to the plurality of transistors respectively. The feedback circuit is coupled to the plurality of transistors and the plurality sets of light emitting diodes. | 04-10-2014 |
20140217908 | LIGHT-EMITTING DIODE LIGHTING DEVICE WITH ADJUSTABLE CURRENT SETTINGS AND SWITCH VOLTAGES - An LED lighting device includes a first luminescent device, a second luminescent device, a first current controller and a second current controller. The first current controller is coupled in parallel with the first luminescent device and configured to operate according to a first current setting, a switch-on voltage and a switch-off voltage. The second current controller is coupled in series to the second luminescent device and configured to operate according to a second current setting. The first current setting, the second current setting, the switch-on voltage and the switch-off voltage are adjusted by setting the mode selection pins of the first and second current controllers. | 08-07-2014 |
20140339990 | LIGHT-EMITTING DIODE LIGHTING DEVICE HAVING MULTIPLE DRIVING STAGES - An LED lighting device includes multiple driving stages. A first driving stage includes a first luminescent device driven by a first current and a first current controller coupled in parallel with the first luminescent device. The first current controller is configured to conduct a second current according to a voltage established across the first current controller and regulate the second current so that a sum of the first current and the second current does not exceed a first value. The second driving stage includes a second luminescent device driven by a third current and a second current controller coupled in series to the second luminescent device. The second current controller is configured to conduct a fourth current according to a voltage established across the second current controller and regulate the fourth current so that a sum of the third current and the fourth current does not exceed a second value. | 11-20-2014 |
20140354164 | LIGHT-EMITTING DIODE LIGHTING DEVICE HAVING MULTIPLE DRIVING STAGES - An LED lighting device includes a slave driving stage and a master driving stage. The slave driving stage includes a first luminescent device and a first current controller for providing a constant current setting in an ON phase. The master driving stage includes a second luminescent device and a current control unit having a second current controller and a current envelope controller. The second current controller provides a current envelope in the ON phase. The current envelope controller sets a level of the current envelope according to a rectified AC voltage. The driving current is regulated by the first current controller according to the constant current setting when the constant current setting is smaller than the level of the current envelope, or by the second current controller according to the current envelope when the level of the current envelope is smaller than the constant current setting. | 12-04-2014 |
20150015164 | LIGHT-EMITTING DIODE LIGHTING DEVICE HAVING MULTIPLE DRIVING STAGES - An LED lighting device includes multiple driving stages. A first driving stage includes a first luminescent device driven by a first current, a second luminescent device driven by a second current, a path-controller for conducting a third current, a first current controller for regulating the first current, and a second current controller for regulating the second current. The second driving stage includes a third current controller coupled in series to the first driving stage and configured to conduct and regulate a fourth current. When the path-controller is turned off, the third current is zero, and the fourth current is equal to the sum of the first current and the second current. When the path-controller is turned on, the first current, the second current, the third current and the fourth current is equal. | 01-15-2015 |