Patent application number | Description | Published |
20130076253 | LIGHT EMITTING DIODE DRIVING APPARATUS - Disclosed herein is a light emitting diode (LED) driving apparatus including: at least one energy storages connected in series with each other; a plurality of LEDs each connected in parallel with each of the energy storages; and a switching control unit selectively connecting the at least one energy storages according to a level of applied voltage to charge/discharge voltage in/from the selected energy storages and control driving of the LEDs by the charging/discharging operation. Therefore, it is possible to easily drive the LEDs without a converter. | 03-28-2013 |
20130162164 | PWM DRIVING CIRCUIT AND PWM DRIVING METHOD - Provided is a PWM driving circuit and a PWM driving method. The PWM driving circuit includes a dimmer switching unit turning on a first switch to apply a first reference signal varied according to an input voltage of a system when an output voltage level of a dimmer is a reference level or less, and turning on a second switch to apply a second reference signal, unrelated to the input voltage of the system, when the output voltage level of the dimmer is more than the reference level, an error amplification unit comparing the first reference signal or the second reference signal with an output detection signal to amplify an error and outputting an error amplification signal, and a PWM control signal generating unit comparing the error amplification signal of the error amplification unit with a predetermined reference waveform to output a PWM control signal. | 06-27-2013 |
20130169182 | PWM CONTROL CIRCUIT, FLYBACK CONVERTER AND METHOD FOR CONTROLLING PWM - Disclosed herein are a PWM control circuit, a flyback converter, and a PWM control method. The PWM control circuit includes: a peak storing and reference signal generating unit storing a peak value of one period of a feedback signal from a secondary side output and inverting the peak signal arid outputting the inverted peak signal as a reference signal; and a PWM control signal generating unit generating a PWM control signal by using an output obtained by comparing the reference signal with a reference waveform from the peak storing and reference signal generating unit. In addition, the flyback converter including the same and the method for controlling PWM are proposed. | 07-04-2013 |
20150062977 | CIRCUIT FOR GENERATING REFERENCE SIGNAL FOR CONTROLLING PEAK CURRENT OF CONVERTER SWITCH, ISOLATED CONVERTER AND METHOD FOR GENERATING REFERENCE SIGNAL FOR CONTROLLING PEAK CURRENT OF CONVERTER SWITCH - Embodiments of the invention provide a method and a circuit for generating a reference signal for controlling a peak current of a converter switch. According to at least one embodiment, the circuit includes a squarer configured to squire an input voltage signal divided from a primary-side supply voltage of an isolated converter, and a duty ratio calculator configured to calculate a duty ratio of energy transfer to a secondary side. The circuit further includes an operator configured to generate and output a reference signal for controlling the peak current of the converter switch from a square signal of the input voltage signal using the duty ratio of energy transfer calculated by the duty ratio calculator. | 03-05-2015 |
20150062978 | CIRCUIT FOR GENERATING REFERENCE SIGNAL FOR CONTROLLING PEAK CURRENT OF CONVERTER SWITCH, ISOLATED CONVERTER AND METHOD FOR GENERATING REFERENCE SIGNAL FOR CONTROLLING PEAK CURRENT OF CONVERTER SWITCH - Embodiments of the invention provide a method and a circuit for generating a reference signal for controlling a peak current of a converter switch. According to at least one embodiment, a dead-zone generator configured to form a dead-zone in an input voltage signal divided from a primary-side supply voltage of an isolated converter, and a duty ratio calculator configured to calculate a duty ratio of energy transfer to a secondary side. The circuit further includes an operator configured to generate and output a reference signal for controlling the peak current of the converter switch from a dead-zone voltage signal having the dead-zone using the duty ratio of energy transfer calculated by the duty ratio calculator. | 03-05-2015 |
Patent application number | Description | Published |
20140001973 | LIGHT EMITTING DIODE DRIVING APPARATUS | 01-02-2014 |
20140035473 | ILLUMINATION DRIVING APPARATUS FOR LIGHT EMITTING DIODE AND METHOD THEREOF - There is provided an illumination driving apparatus for a light emitting diode, the apparatus including: a light emitting unit including M number of light emitting diodes (LEDs) connected in series and driven by an output voltage rectified in a rectifying unit; an LED switch unit including N number of LED switches connected in parallel with at least N number of the M LEDs, respectively, and connected in series; an LED switch control signal generating unit comparing the output voltage of the rectifying unit with each of the first to Nth preset reference voltages to generate N number of LED switch control signals controlling the LED switch unit; and an LED switch controlling unit transferring the N number of LED switch control signals to the LED switch unit. | 02-06-2014 |
20140035476 | LIGHT EMITTING DIODE DRIVING APPARATUS - There is provided a light emitting diode driving apparatus capable of supplying a constant average current to a light emitting diode by generating a reference voltage used for driving the light emitting diode according to input power and a switching signal switching a path of a current supplied to the light emitting diode. The light emitting diode driving apparatus includes: a reference voltage generating unit generating a reference voltage set based on input power and a switching signal for supplying driving power to a light emitting diode; and a driving unit supplying the driving power to the light emitting diode according to the reference voltage. | 02-06-2014 |
20140091717 | APPARATUS FOR DRIVING LIGHT EMITTING DIODE - There is provided an apparatus for driving a light emitting diode (LED), capable of distributing current stress applied to the LED. The apparatus includes an LED part including a plurality of LED units respectively including at least one LED, the plurality of LED units being connected in parallel to a power input terminal to which rectified power in sine wave form is supplied, and, among the plurality of LED units connected in parallel, a termination end of the LED unit in a front end being connected to a middle of an adjacent LED unit; and a current source unit including a plurality of current sources respectively connected to termination ends of the plurality of LED units and allowing corresponding current to flow through the plurality of LED units. | 04-03-2014 |
20140184077 | LIGHT EMITTING DIODE DRIVING APPARATUS - There is provided a light emitting diode (LED) driving apparatus configured such that a waveform of current input to an LED follows a sine wave, the LED driving apparatus including, a switching unit switching an LED unit having a plurality of LEDs receiving rectified power and emitting light, a driving control unit controlling the switching of the switching unit according to a voltage level of the rectified power, a current limiting unit limiting current flowing in the LED unit, and an adjusting unit adjusting current limitation of the current limiting unit according to the voltage level of the rectified power. | 07-03-2014 |
20140368119 | LIGHT EMITTING DIODE LIGHTING APPARATUS AND DRIVING METHOD THEREOF - There is provide a light emitting diode lighting apparatus capable of being generally used in various kinds of dimmer, the apparatus including: a dimmer varying waveforms of input power according to a dimming signal; a bleeder adjusting a bleeding current under control; a controller comparing a latching current of the dimmer with the bleeding current of the bleeder to control the amount of the bleeding current; and an LED driver receiving a current other than the bleeding current flowing through the bleeder from among the currents from the dimmer to driver a light emitting diode (LED). | 12-18-2014 |
20150115821 | LIGHT EMITTING DIODE DRIVER AND METHOD OF CONTROLLING THE SAME - There is provided a light emitting diode (LED) driver including: a power supplying unit including a dimmer and a rectifying unit and supplying a supply voltage to an LED device; and a control unit acquiring section information regarding the supply voltage and setting an LED on-time based on the section information. | 04-30-2015 |
Patent application number | Description | Published |
20140184187 | AVERAGE CURRENT CONTROLLER, AVERAGE CURRENT CONTROL METHOD AND BUCK CONVERTER USING THE AVERAGE CURRENT CONTROLLER - The present invention relates to an average current controller, an average current control method and a buck converter using the average current controller. The average current controller includes a first comparator for generating a high H signal, a multivibrator for generating a TAVG pulse signal by receiving a high H signal outputted from the first comparator, a timing generator for generating a signal CH_ON to charge/discharge a capacitor by using at least the TAVG pulse signal, an integrator circuit unit for charging/discharging the capacitor, a second comparator for outputting a corresponding signal, an up/down counter for increasing or decreasing a counting value and a digital/analog converter for outputting by converting an output (digital signal) of the up/down counter into an analog signal. | 07-03-2014 |
20140184276 | GATE DRIVER - Disclosed herein is a gate driver. The gate driver according to an exemplary embodiment of the present invention includes: a first power switch sourcing current according to voltage applied by a voltage source; a second power switch connected with the first power switch in series and sinking current according to the voltage applied by the voltage source; and a speed booster receiving a voltage pulse from the outside to output peak current so as to make a turn on/off operation of the first power switch fast. As set forth above, according to the exemplary embodiments of the present invention, it is possible to improve the driving speed of the gate driver without increasing the current of the current source by further including the speed booster configured of the plurality of MOSFETs and the capacitor. | 07-03-2014 |
20140184307 | GATE DRIVER HAVING FUNCTION OF PREVENTING SHOOT-THROUGH CURRENT - Disclosed herein is a gate driver having a function of preventing shoot-through current. The gate driver having a function of preventing shoot-through current includes: a first power switch sourcing current according to voltage applied by a voltage source; a second power switch connected with the first power switch in series and sinking current according to voltage applied by the voltage source; and a shoot-through current preventing circuit preventing the occurrence of shoot-through current in first and second power switches at the time of driving of the first and second power switches. According to the present invention, the shoot-through current preventing circuit configured of the plurality of PMOSs and NMOSs can prevent the shoot-through current from occurring in the power transistor of the output terminal at the time of the driving of the gate driver, thereby preventing the unnecessary power consumption and the occurrence of ground noise. | 07-03-2014 |
Patent application number | Description | Published |
20150115819 | LIGHT EMITTING DIODE DRIVING APPARATUS - A light emitting diode driving apparatus may include: a light emitting diode emitting light by receiving rectified power; a driver driving the light emitting diode based on a voltage level of the rectified power; and a controller limiting an operation of the driver based on a voltage applied to the driver and a hysteresis reference value. | 04-30-2015 |
20150115822 | LIGHT EMITTING DIODE DRIVING APPARATUS - A light emitting diode (LED) driving apparatus may include: a power converting unit switching input power to supply driving power to at least one LED; and a driving controlling unit controlling the supplying of the power of the power converting unit based on a switching period of the power converting unit and a demagnetization time in the switching period. | 04-30-2015 |
20150115828 | LIGHT EMITTING DIODE DRIVING APPARATUS AND LIGHT EMITTING DIODE LIGHTING APPRATUS - A light emitting diode driving apparatus may include a power supplying unit receiving phase-controlled power and supplying operation power having a preset level, a driving unit receiving the operation power from the power supplying unit to drive a light emitting diode unit receiving the phase-controlled power, and a noise current limiting unit decreasing a noise current due to a parasitic capacitance component of the driving unit. | 04-30-2015 |
20150116013 | INTEGRATED CIRCUIT - There is provided an integrated circuit controlling a power supply, the integrated circuit including: an HV pin obtaining startup power; a voltage dividing unit connected to the HV pin; and an input voltage detecting unit detecting an input voltage through voltage distribution by the voltage dividing unit. The integrated circuit may be capable of reducing manufacturing costs by omitting a separate voltage sensing pin. | 04-30-2015 |
20150117065 | GATE DRIVING CIRCUIT, AND SWITCHING APPARATUS AND POWER SUPPLY APPARATUS HAVING THE SAME - A gate driving circuit may include: a bias unit receiving an input signal having preset high and low signal levels, including a first N-MOSFET turned on in the case in which the input signal has the high level and a first P-MOSFET turned on in the case in which the input signal has the low level, and supplying bias powers by the turning-on of the first N-MOSFET and the first P-MOSFET; and an amplifying unit including a second N-MOSFET turned on by receiving the bias power supplied from the first N-MOSFET in the case in which the input signal has the high level and a second P-MOSFET turned on by receiving the bias power supplied from the first P-MOSFET turned on in the case in which the input signal has the low level and providing a gate signal depending on the turning-on of the second N-MOSFET and the second P-MOSFET. | 04-30-2015 |