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US 10,219,336 B2Granted
LED lighting apparatus
AssigneeSilicon Works Co., Ltd.
InventorsGyeong Sik Mun, Ki Soo Kwon
Life of this patent
Estimating the term…
Abstract
Disclosed is an LED lighting apparatus which includes LED groups and emits light in response to a change of a rectified voltage. The LED lighting apparatus includes a balancing circuit which controls the rectified voltage to be applied to the LED groups in parallel or series to each other.
Claims20
An LED lighting apparatus comprising:
- a rectifier circuit configured to output a rectified voltage;
- a channel unit configured to provide a discharge current to an output terminal of the rectifier circuit when the rectified voltage is equal to or higher than a first level;
- a first LED group connected to the rectifier circuit, and configured to emit light in response to the rectified voltage equal to or more than a second level which is higher than the first level;
- a balancing resistor connected to an output terminal of the first LED group;
- a balancing circuit configured to form a balancing path between the rectifier circuit and the balancing resistor and perform first regulation on a current of the balancing path, in response to the rectified voltage less than a third level which is higher than the second level;
- a second LED group connected to the balancing resistor, and configured to emit light in response to the rectified voltage applied through any one of the balancing path and the first LED group;
- a driver configured to selectively provide a current path for the turned-on first and second LED groups and the discharge path of the channel unit by comparing a sensing voltage and an internal reference voltage;
- and
- a sensing resistor configured to sense a driving current outputted from the driver through the current path, and provide the sensing voltage.
6 more elements
An LED lighting apparatus comprising:
- a dimmer configured to output a phase angle-controlled AC voltage;
- a rectifier circuit configured to output a rectified voltage in response to the AC voltage;
- a channel unit configured to provide a discharge path for a holding current of the dimmer to an output terminal of the rectifier circuit when the rectified voltage is equal to or more than a first level;
- first and second LED groups configured to receive the rectified voltage, connected in series to emit light when the rectified voltage is equal to or more than a third level in a one-cycle change of the rectified voltage, and connected in parallel to emit light when the rectified voltage is equal to or more than the second level and less than the third level, wherein the second level is higher than the first level, and the third level is higher than the second level;
- a balancing resistor installed between the first and second LED groups;
- a balancing circuit configured to control formation of a balancing path through a balancing voltage of the balancing resistor, provide the balancing path for transferring the rectified voltage to the second LED group connected in parallel to the first LED group through the balancing resistor in response to the rectified voltage equal to or more than the second level and less than the third level, and perform first regulation on a current of the balancing path;
- a driver configured to selectively provide a current path corresponding to light emission of the first and second LED groups and the discharge path of the channel unit by comparing a sensing voltage and an internal reference voltage;
- and
- a sensing resistor configured to sense a driving current outputted from the driver through the current path, and provide the sensing voltage.
6 more elements
Dependencies are inferred from the claim text.