Seoul Semiconductor Co., Ltd.

Hye Man Jung

Hyun Gu Kang

Sang Wook Han

Young Do Jung

Young Do Jong

Kang Nyung Lee

Sung Ho Jin

Young Eun Yang

Oh Seok Kim

Snag Wook Han

Jin Cheol Shin

Keith Hopwood

An LED lighting apparatus including a rectifier to rectify AC voltages having different magnitudes and generate driving voltages corresponding to rectified voltages, a buck converter connected to an output terminal of the rectifier and generate an LED driving current corresponding to the driving voltages, a variable reference voltage comparator to receive the driving voltages, and generate variable reference voltages that fluctuate in correspondence to magnitudes of the output driving voltages, compare the driving voltages and the variable reference voltages, and output signals for controlling an operation of the buck converter, an LED including at least one LED group and driven by the LED driving current generated by the buck converter, and a controller including a converter controller to control the operation of the buck converter and a constant current controller to constant current-control the LED driving current applied to the at least one LED group.

LED lighting apparatus and LED driving circuit thereof

An alternating current sequential drive type LED lighting device having improved flicker performance and being capable of reducing the light output deviation of the LED lighting device generated during operation intervals by removing nonluminous intervals of the LED lighting device by means of a loop-back compensation unit.

LED drive circuit with improved flicker performance, and LED lighting device comprising same

A lighting apparatus includes a light-emitting diode (LED) array, a rectifying unit configured to rectify an alternating current (AC) voltage and to generate a driving voltage for the LED array, a switch control signal generation unit configured to generate a switching control signal depending on the driving voltage, the switching control signal including connection control signals and a compensation control signal, connection changing units configured to change a connection between the LEDs according to the connection control signals, and a light output compensation unit configured to generate a compensation voltage according to the compensation control signal, and selectively supply the compensation voltage to the LED array.

Backlight driving apparatus

According to the present invention, provided is an LED driving circuit comprising: a first rectification module, connected to an alternating current power source, for full-wave rectifying an applied alternating current voltage and for supplying a first rectification voltage which has been full-wave rectified to an LED light emitting module as a first driving voltage; and a second driving voltage supply module, connected to the alternating current power source in parallel with the first rectification module, for full-wave rectifying an applied alternating current voltage to generate a second rectification voltage, for charging energy using the generated second rectification voltage at a charging section, and for supplying a second driving voltage to the LED light emitting module at a compensating section.

LED driving circuit using double bridge diode and LED illumination device comprising same

An optical communication device including a plurality of groups of light emitting diode (LED) groups that are turn on according to a control of a lighting and communication control module. The lighting and communication control module is configured to receive an AC input voltage, generate a rectified voltage from the AC input voltage, determine a voltage level of the rectified voltage, sequentially drive the plurality of LED groups according to the voltage level of the rectified voltage, and perform optical communication through the plurality of LED groups only when the voltage level of the rectified voltage is greater than or equal to a preset threshold voltage level.

Optical communication device using AC LED lighting and communication method using the same

An LED luminescence apparatus is provided, which includes a rectifying unit rectifying an AC voltage and generating a rectified voltage; a plurality of LEDs connected in series to an output terminal of the rectifying unit; a plurality of switches having drain terminals connected to cathodes of the plurality of LEDs, respectively; and a switch control unit sensing current through a plurality of resistors connected to source terminals of the plurality of switches, respectively, comparing the sensed current with a set reference current, and outputting a voltage corresponding to a difference between the sensed current and the set reference current to a gate terminal of each of the plurality of switches.

LED luminescence apparatus

A light-emitting diode (LED) driving circuit configured to drive LED units includes a rectification circuit unit to receive an alternating current (AC) power voltage and rectify the AC power voltage to output a unidirectional ripple voltage, a pulse-width modulation (PWM) signal generation unit to generate PWM decision signals. The PWM signal generation unit is configured to sequentially drive the LEDs according to the PWM decision signals.

LED luminescence apparatus and method of driving the same

An illumination apparatus of a high efficiency light emitting element and a driving circuit of a light emitting element controlling a series and parallel connection relationship between light emitting groups according to a voltage level of a driving voltage and controlling a sequential driving of the light emitting groups at the same time.

Illumination apparatus including semiconductor light emitting diodes

An exemplary embodiment discloses a light-emitting diode (LED) driving circuit including an LED driving module configured to provide a first driving voltage to an LED light emitting module including a first LED group to an n-th LED group, n is an integer which is equal to or larger than 2, and sequentially drive the first LED group to the n-th LED group depending on a voltage level of the first driving voltage and a second driving voltage providing module configured to store some of the first driving voltage and selectively provide a second driving voltage to some of the LED groups other than at least the first LED group to an m-th LED group among the LED groups in a Vcompensation section, 1&#x2266;m&#x2266;n&#x2212;1, according to a control of the LED driving module.

LED driving circuit for continuously driving LED, LED lighting device comprising same and driving method

An LED driving circuit package includes a rectification unit to receive an AC power voltage and rectify the AC power voltage to generate a ripple voltage, an LED driving switching unit including a plurality of switch units and a plurality of current control units. The LED driving circuit package further includes a low voltage control unit including a circuit power supply unit to generate low voltage power, a voltage detection unit to detect a magnitude of the ripple voltage, a reference frequency generation unit to generate a reference frequency, and a reference pulse generation unit to generate a reference pulse for controlling the operation of the LED driving switch unit according to the reference frequency and a magnitude of the voltage detected by the voltage detection unit.

LED driving circuit package

A backlight driving apparatus that drives a backlight unit having a plurality of LEDs is provided, which includes a rectifying unit rectifying an AC voltage and generating a driving voltage for the plurality of LEDs, a plurality of connection changing units changing connection relations between the plurality of LEDs depending on a level of the driving voltage, and a light output compensation unit generating a compensation voltage using the driving voltage and selectively supplying the compensation voltage to the plurality of LEDs.

Disclosed herein are a light emitting diode (LED) driving apparatus and driving method for continuously driving an LED. According to the present invention, an LED driving apparatus and driving method for continuously driving an LED capable of compensating for a light output of an LED lighting using an energy chargeable and dischargeable element and/or circuit are proposed.

Growing community of inventors

Ansan-si, South Korea

Hye Man Jung