Silicon Works Co., Ltd.

Young Suk Son

Yong Goo Kim

Won Ji Lee

Jong Min Lee

Kyung Min Kim

Hyung Seog Oh

Dae Keun Han

Wanyuan Qu

Jin Hee Jeon

Sang Young Lee

Yong Geun Kim

Yong Sung Ahn

Joon Ho Na

Jae Wan Kim

Young Jin Woo

Gyeong Sik Mun

Dae Seong Kim

Hyun Ho Cho

Ok Hwan Kwon

Tae Kyu Nam

Myoung Soo Song

Hyun Ja Cho

Won Suk Jang

Min Soo Kim

Young Icc Jung

So Bong Shin

Disclosed is a control circuit of an LED lighting apparatus, which compensates for power for light emission of a lamp including LEDs. The control circuit can generate a compensation signal corresponding to change of power provided to the lamp, and uniformly maintain the power by controlling a current provided to the lamp in response to the compensation signal. Thus, the control circuit can compensate for the power change of the lamp due to a power supply environment factor in a building, region, or country or a temporarily unstable power supply environment factor, such that the lamp can emit light at uniform luminance.

Control circuit of light emitting diode lighting apparatus

Disclosed herein are a switching mode converter and a method for controlling thereof. The switching mode converter includes a switching element, a bootstrap capacitor, and a control unit. The switching element is connected between one side of a first semiconductor device, another side of the first semiconductor device is connected to a ground, and an input power. The bootstrap capacitor is configured such that one side of the bootstrap capacitor is connected to the one side of the first semiconductor device. The control unit controls the output current or output voltage of a common charge pump provided to the switching element and the bootstrap capacitor in order to control the charging state of the bootstrap capacitor and the gate voltage of the switching element.

Switching mode converter having 100% duty cycle mode and method for controlling thereof

Disclosed are an LED lighting apparatus and a control circuit thereof which controls the brightness of a lamp including LEDs using a dimmer. The LED lighting apparatus and the control circuit use a starting current based on a rectified voltage, in order to supply a holding current to the dimmer in a state where a lamp including LEDs is turned off.

LED lighting apparatus and control circuit thereof

Disclosed is a control circuit of an LED lighting apparatus having a dimming function. The control circuit provides a current path corresponding to light emitting states of LED channels in response to a rectified voltage, and performs dimming by controlling a current amount of the current path in response to a dimming control signal provided as an analog signal or digital signal.

Control circuit of light-emitting diode lighting apparatus

Disclosed are an LED lighting apparatus and a control circuit thereof which controls illumination of a lamp including LEDs using a dimmer. The LED lighting apparatus includes a flicker control unit which provides a control signal corresponding to a rectified voltage having a low angle corresponding to a preset low angle region and equal to or less than a preset level or detects an initial abnormal waveform diagram of the rectified voltage and provides a control signal corresponding to the abnormal waveform period, and controls a current path for light emission of the lamp.

Provided are a method of generating a message authentication code and an authentication device and an authentication request device using the method. The method includes generating a second secret key by encrypting seed data, a first secret key, and first auxiliary data using an encryption algorithm; and encrypting the seed data, the second secret key, and second auxiliary data using the encryption algorithm, wherein the encryption algorithm receives data of a preset base number of bits and encrypts the received data, and the number of bits of the second auxiliary data varies according to a difference between the number of bits of the first secret key and the number of bits of the second secret key.

Method of generating message authentication code and authentication device and authentication request device using the method

Disclosed is a light emitting diode lighting apparatus capable of improving a power factor and temperature characteristics. The light emitting diode lighting apparatus according to a preferred embodiment of the present invention includes a light source having a plurality of light emitting diode channels and performs a current regulating operation to allow a light source to emit light. The light source uses a current path provided by current regulating to emit light.

An LCD driving circuit includes a first buffer configured to have a terminal for a first voltage, a terminal for a second voltage and a terminal for an intermediate voltage between the first voltage and the second voltage, and be driven in a range from the first voltage to the intermediate voltage; and a second buffer configured to have a terminal for the first voltage, a terminal for the second voltage and a terminal for the intermediate voltage, and be driven in a range from the intermediate voltage to the second voltage. The terminal for the intermediate voltage of the first buffer and the terminal for the intermediate voltage of the second buffer are connected with each other, and the first voltage is a highest voltage, the second voltage is a lowest voltage, and the intermediate voltage is in a range from the first voltage to the second voltage.

Liquid crystal display driving circuit with less current consumption

The present invention introduces a device and a method for driving an LED with an improved power factor without using a voltage detector having a large amount of area and power consumption. The device for driving an LED includes a power supply unit, an LED array, and a current path select circuit. The LED arrayis connected with the power supply unit in parallel and includes at least one LED string including LED channels LEDto LEDn that are configured of a plurality of LEDs connected in series. The current path select circuit selects a path of current flowing from output terminals of the plurality of LED channels according to voltage levels of each of the output terminals of the plurality of LED channels.

Device for driving light emitting diode

An amplifier and a display driving circuit. The amplifier includes an input stage, a bias stage and an output stage. The input stage determines voltage levels of two nodes in correspondence to two input voltages received in response to a first bias voltage, and includes four path selecting switches, two input transistors and one bias transistor. The bias stage generates two class AB output voltages which correspond to the voltage levels of the two nodes, and includes current mirrors, ten path selecting switches, class AB bias circuits and two bias transistors. The output stage generates an output voltage VOUT that corresponds to the two class AB output voltages, and includes two coupling capacitors and two push-pull transistors. The plurality of path selecting switches operate by one signal of a first path selecting signal and a second path selecting signal that are exclusively enabled with respect to each other.

Amplifier including dithering switch and display driving circuit using the amplifier

A driver IC for electrical loads, suitable for regulating a driving voltage depending upon a feedback signal and supplying a regulated driving voltage to a power supply line to which load strings are connected in parallel. The driver IC includes driving current sources respectively connected to the load strings through regulated voltage nodes and configured to supply driving current to the load strings in response to a control signal; sensing units configured to sense and output a minimum voltage among voltages of the regulated voltage nodes; a sample-and-hold circuit configured to sample, hold and output the minimum voltage in response to the control signal; and a comparator configured to compare an output voltage of the sample-and-hold circuit and a reference threshold voltage and generate the feedback signal.

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Daejeon-si, South Korea

Young Suk Son