LED driving device
AssigneeSamsung Electronics Co., Ltd.
InventorBong Jin Lee
Life of this patent
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Abstract
A light-emitting diode (LED) driving device comprising: a rectifier configured to convert alternating current (AC) power to direct current (DC) power; a convertor including: a transformer including a primary-side winding connected to the rectifier; and a main switch connected to the primary-side winding of the transformer; a controller configured to output a control signal to the main switch in response to a feedback signal; and an output modifier configured to modify the feedback signal.
Claims15
A light-emitting diode (LED) driving device comprising:
- a rectifier configured to convert alternating current (AC) power to direct current (DC) power;
- a convertor including:
- a transformer including a primary-side winding connected to the rectifier;
- and
- a main switch connected to the primary-side winding of the transformer;
- a controller configured to output a control signal to the main switch in response to a feedback signal;
- and
- an output modifier configured to modify the feedback signal;
- wherein:
- the output modifier includes a resistance circuit having variable resistance and is connected to the main switch in series;
- and
- the resistance circuit includes a plurality of resistors connected to each other in parallel, and at least one switching element configured to connect or disconnect the resistors to and from each other.
A light-emitting diode (LED) driving device comprising:
- a rectifier configured to convert alternating current (AC) power to direct current (DC) power;
- a convertor including:
- a transformer including a primary-side winding connected to the rectifier;
- a main switch connected to the primary-side winding of the transformer;
- and
- an inductance modifier connected to a primary-side winding of the transformer and configured to selectively modify a primary-side inductance of the transformer;
- and
- a controller configured to output a control signal to the main switch in response to a feedback signal from the convertor;
- wherein the inductance modifier includes a switching element connected in parallel across at least a portion of the primary-side winding of the transformer.
A light-emitting diode (LED) driving device comprising:
- a rectifier configured to convert alternating current (AC) power to direct current (DC) power;
- a convertor including:
- a transformer including a primary-side winding connected to the rectifier;
- and
- a main switch connected to the primary-side winding of the transformer;
- a controller configured to output a control signal to the main switch in response to a feedback signal from the convertor;
- and
- an output modifier configured to modify a time constant of the main switch
- wherein:
- the output modifier includes a time constant control circuit having a variable resistance;
- and
- the time constant control circuit is connected to at least one capacitor included in the controller and is configured to adjust a time in which the at least one capacitor is charged or discharged.
Dependencies are inferred from the claim text.