US 2011/0254467 A1Published application

Two-terminal current controller and related led lighting device

AssigneeIML International

InventorsYung-Hsin Chiang, Yi-Mei Li

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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.

Claims16

Dependent claims

A light-emitting diode (LED) lighting device, comprising:

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 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, wherein:
when the voltage established across the two-terminal current controller does not exceed a first voltage during a rising period of a rectified alternative-current (AC) voltage whose value varies periodically with time, the two-terminal current controller is turned on for maintaining the first current at substantially zero and regulating the second current according to the voltage established across the two-terminal current controller;
when the voltage established across the two-terminal current controller is larger than the first voltage and does not exceed a second voltage during the rising period, the two-terminal current controller is turned on for maintaining the first current at substantially zero and setting the second current to a predetermined value larger than zero;
and
when the voltage established across the two-terminal current controller is larger than the second voltage during the rising period, the two-terminal current controller is turned off for equalizing the first current and the second current.

4 more elements

A two-terminal current controller for controlling a first current flowing through a load which is coupled in parallel with the two-terminal current controller, wherein:

when a voltage established across the two-terminal current controller does not exceed a first voltage during a rising period of a rectified AC voltage, the two-terminal current controller operates in a first mode for conducting a second current associated with the rectified AC voltage, thereby maintaining the first current at substantially zero and regulating the second current according to the voltage established across the two-terminal current controller;
when the voltage established across the two-terminal current controller is larger than the first voltage and does not exceed a second voltage during the rising period, the two-terminal current controller operates in a second mode for conducting the second current, thereby maintaining the first current at substantially zero and setting the second current to a predetermined value larger than zero;
and
when the voltage established across the two-terminal current controller is larger than the second voltage during the rising period, the two-terminal current controller operates in a third mode in which the two-terminal current controller is turned off for maintaining the second current at substantially zero.

1 more element

Dependencies are inferred from the claim text.