Abstract: A light emitting diode driving apparatus includes a rectifier, a converter, a feedback circuit, and a controller. The rectifier converts alternating current power to direct current (DC) power. The converter supplies driving power to a plurality of LEDs based on the DC power. The feedback circuit generates a feedback signal based on a current flowing in the plurality of LEDs and adjusts a magnitude of the feedback signal. The controller changes a maximum value of a current output by the converter based on the adjusted magnitude of the feedback signal.

Abstract: A light emitting diode driving apparatus includes a rectifier, a converter, a feedback circuit, and a controller. The rectifier converts alternating current power to direct current (DC) power. The converter supplies driving power to a plurality of LEDs based on the DC power. The feedback circuit generates a feedback signal based on a current flowing in the plurality of LEDs and adjusts a magnitude of the feedback signal. The controller changes a maximum value of a current output by the converter based on the adjusted magnitude of the feedback signal.

Abstract: An LED driving apparatus includes: a PCB substrate having a voltage transformer and a switching device provided above the PCB substrate, the PCB substrate including a first circuit corresponding to a primary side of the voltage transformer and a second circuit corresponding to a secondary side of the voltage transformer; a first molding layer which is provided on the PCB substrate and covers the voltage transformer and the switching device; and a plurality of thermoelectric devices where heat dissipates. Some of the thermoelectric devices are connected to the first circuit and others of the thermoelectric devices are connected to the second circuit.

Abstract: An LED driving apparatus includes: a PCB substrate having a voltage transformer and a switching device provided above the PCB substrate, the PCB substrate including a first circuit corresponding to a primary side of the voltage transformer and a second circuit corresponding to a secondary side of the voltage transformer; a first molding layer which is provided on the PCB substrate and covers the voltage transformer and the switching device; and a plurality of thermoelectric devices where heat dissipates. Some of the thermoelectric devices are connected to the first circuit and others of the thermoelectric devices are connected to the second circuit.

Abstract: A light emitting device includes a light source unit, a connection controller, and a driving controller. The light source unit includes a first LED array including a plurality of first LEDs connected in series and a second LED array including a plurality of second LEDs connected in series. The connection controller selectively sets a connection structure between the first and second LED arrays as a series connection, a parallel connection, or a series-parallel connection based on a peak value of a driving voltage driving the light source unit. The driving controller controls the number of LEDs driven in the light source unit according to a magnitude of the driving voltage. Each of the first and second LED arrays is connected between a plurality of first nodes and a plurality of second nodes.

Abstract: A light emitting diode (LED) driving device is provided. The LED driving device includes a rectifier configured to rectify alternating current (AC) power to generate rectified power; an AC driver configured to control operations of a plurality of LED groups so that the plurality of LED groups receive the rectified power generated by the rectifier; and a light amount controller configured to reduce an amount of current applied to the plurality of LED groups when a peak value of the rectified power is increased, and increase the amount of current applied to the plurality of LED groups when the peak value of the rectified power is reduced.

Abstract: A light emitting diode (LED) driving device is provided. The LED driving device includes a rectifier configured to rectify alternating current (AC) power to generate rectified power; an AC driver configured to control operations of a plurality of LED groups so that the plurality of LED groups receive the rectified power generated by the rectifier; and a light amount controller configured to reduce an amount of current applied to the plurality of LED groups when a peak value of the rectified power is increased, and increase the amount of current applied to the plurality of LED groups when the peak value of the rectified power is reduced.

Abstract: A light emitting diode (LED) driving device includes a rectifier configured to rectify alternating current power to generate rectified power, an AC driver configured to control respective operations of the plurality of LED groups based on a voltage of the rectified power, and a controller configured to control an operation of the AC driver based on a control command received through a digital addressable lighting interface (DALI) communications protocol, and operate based on the rectified power received as driving power.

Abstract: A light emitting device includes a light source unit, a connection controller, and a driving controller. The light source unit includes a first LED array including a plurality of first LEDs connected in series and a second LED array including a plurality of second LEDs connected in series. The connection controller selectively sets a connection structure between the first and second LED arrays as a series connection, a parallel connection, or a series-parallel connection based on a peak value of a driving voltage driving the light source unit. The driving controller controls the number of LEDs driven in the light source unit according to a magnitude of the driving voltage. Each of the first and second LED arrays is connected between a plurality of first nodes and a plurality of second nodes.

Abstract: A light emitting diode (LED) driving device includes a rectifier, a voltage converter, a variable impedance unit, and a controller. The rectifier rectifies an alternating current (AC) voltage to generate a first voltage. The voltage converter generates a second voltage for driving a plurality of LEDs from the first voltage. The variable impedance unit is connected to an input terminal of the rectifier. The controller adjusts impedance of the variable impedance unit based on at least one of the first and second voltages.

Abstract: An illuminating device includes a light source module; a heat radiator including a heat radiating plate having a cavity open toward a front surface thereof and receiving the light source module therein and ventilation holes disposed along an edge of the cavity, and heat radiating fins extending to a rear surface of the heat radiating plate, disposed in a radial manner along an edge of the heat radiating plate and positioned between the ventilation holes to form ventilation channels therebetween communicating with the ventilation holes; a cooler fixed to the heat radiator to be in contact with ends of the heat radiating fins and including air jet holes allowing air to be blown toward the heat radiator; and an electrical connector connected to the light source module and the cooler and supplying electrical signals thereto.

Abstract: A method of manufacturing a power supply unit (PSU) is provided. The method includes providing at least one PSU supplying a dimming signal to at least one light source, performing a first test for electrical characteristics of the at least one PSU, detecting light emitted from the at least one light source, measuring a flicker of the at least one light source, and performing a second test for a state of the at least one PSU based on a flicker measurement result, and packing a PSU determined to be in a normal state among the at least one PSU, as a result of the first test and the second test.

Abstract: A test apparatus for a power supply unit is provided, which includes a body unit configured to define a space to receive a light emitting diode (LED) and to provide a test environment to test a supply state of power applied to the LED; and a test unit mounted in the body unit to face the LED and configured to detect flicker of the LED occurring when a power supply is abnormal. According to the foregoing structure, power supply with respect to the LED may be regularly detected and analyzed, thereby increasing quality of power supply with respect to the LED.

Abstract: A method of manufacturing a power supply unit (PSU) is provided. The method includes providing at least one PSU supplying a dimming signal to at least one light source, performing a first test for electrical characteristics of the at least one PSU, detecting light emitted from the at least one light source, measuring a flicker of the at least one light source, and performing a second test for a state of the at least one PSU based on a flicker measurement result, and packing a PSU determined to be in a normal state among the at least one PSU, as a result of the first test and the second test.

Abstract: A method of manufacturing a power supply unit (PSU) is provided. The method includes providing at least one PSU supplying a dimming signal to at least one light source, performing a first test for electrical characteristics of the at least one PSU, detecting light emitted from the at least one light source, measuring a flicker of the at least one light source, and performing a second test for a state of the at least one PSU based on a flicker measurement result, and packing a PSU determined to be in a normal state among the at least one PSU, as a result of the first test and the second test.

Abstract: A method of manufacturing a power supply unit (PSU) is provided. The method includes providing at least one PSU supplying a dimming signal to at least one light source, performing a first test for electrical characteristics of the at least one PSU, detecting light emitted from the at least one light source, measuring a flicker of the at least one light source, and performing a second test for a state of the at least one PSU based on a flicker measurement result, and packing a PSU determined to be in a normal state among the at least one PSU, as a result of the first test and the second test.

Abstract: A test apparatus for a power supply unit is provided, which includes a body unit configured to define a space to receive a light emitting diode (LED) and to provide a test environment to test a supply state of power applied to the LED; and a test unit mounted in the body unit to face the LED and configured to detect flicker of the LED occurring when a power supply is abnormal. According to the foregoing structure, power supply with respect to the LED may be regularly detected and analyzed, thereby increasing quality of power supply with respect to the LED.