Patent application number | Description | Published |
20100014331 | Power Converter, Switching Control Device Thereof, And Driving Method Thereof - A power converter according to the present invention includes a power supply unit, an output unit, and a switching controller. The power supply unit includes a primary coil of a transformer that receives an input voltage, a gate electrode, and a switch having a first electrode and a second electrode that is connected to the primary coil. The output unit includes a secondary coil of the transformer, and outputs an output voltage that is converted from the input voltage by the transformer. The switching controller includes a feedback terminal that receives a feedback voltage corresponding to the output voltage, generates a burst voltage by compensating the feedback voltage according to a maximum current value that can flow between the second electrode and the first electrode of the switch, determines whether to perform a burst mode operation according to the burst voltage, and transmits a gate signal according to performance of the burst mode operation to the gate electrode of the switch. | 01-21-2010 |
20100039834 | Power Converter, And Switching Controller And Driving Method Thereof - In a power converter, a primary coil of a transformer receives an input voltage, and a first terminal of a switch is coupled to the primary coil. An output unit includes a secondary coil of the transformer, and outputs an output voltage to which the input voltage is converted by the transformer. A switching controller receives a feedback voltage corresponding to the output voltage and a sensing voltage corresponding to a current flowing between the first terminal and a second terminal of the switch. The switching controller determines whether to perform an operation of a burst mode based on the feedback voltage. The switching controller generates a control signal by comparing the sensing voltage with a comparison voltage during a first period of the burst mode, generates the control signal by comparing the sensing voltage with a voltage corresponding to the feedback voltage during a second period of the burst mode, and transmits the control signal to a control terminal of the switch. | 02-18-2010 |
20100194463 | SWITCH CONTROL DEVICE AND SWITCH CONTROL METHOD - The present invention relates to a switch control device and a switch control method. The present invention controls a switching operation of a power switch that controls output power of a switching mode power supply (SMPS). The present invention generates an operation current corresponding to an input voltage of the SMPS and counts a compensation period in which a power supply voltage generated by the operation current increases from a predetermined counter low-reference voltage to a predetermined counter high-reference voltage. The present invention generates a compensation feedback current depending on the count result, generates a total feedback current by summing a main feedback current having a predetermined value and the compensation feedback current, and generates a power limit current of which a maximum value increases and decreases depending on the total feedback current. Turn-off of the power switch is determined by comparing the current flowing on the power switch with the power limit current. | 08-05-2010 |
20110095733 | POWER FACTOR CORRECTION CIRCUIT AND DRIVING METHOD THEREOF - The present invention relates to a power factor correction circuit and a driving method thereof. | 04-28-2011 |
20110102950 | POWER FACTOR CORRECTION CIRCUIT AND DRIVING METHOD THEREOF - The present invention relates to a power factor correction circuit and a driving method thereof. | 05-05-2011 |
20110204866 | SWITCH CONTROL DEVICE, POWER SUPPLY DEVICE INCLUDING THE SAME, AND SWITCH CONTROL METHOD - The present invention relates to a switch control device, a power supply device, and a switch control method. A switch control device controls a switching operation of a power switch by using a feedback voltage of an output voltage. In detail, the switch control device generates the feedback current according to the feedback voltage and the feedback signal corresponding to the feedback voltage by using the feedback current. The switch control device compares the sensing signal corresponding to the drain current flowing to the power switch and the feedback signal, and turns off the power switch according to the comparison result. The switch control device increases the feedback gain rather than the feedback current during the gain compensation period after a predetermined gain compensation period, and the gain compensation period is longer than a soft start period in which the output voltage is gradually increased. | 08-25-2011 |
20110221402 | POWER FACTOR CORRECTION CIRCUIT AND DRIVING METHOD THEREOF - The present invention relates to a power factor correction circuit and a driving method thereof. | 09-15-2011 |
20120105016 | APPARATUS AND METHOD FOR DISCHARGING CAPACITOR OF INPUT FILTER OF POWER SUPPLY, AND POWER SUPPLY INCLUDING THE APPARATUS - A power supply includes an input filter and a discharging device. The input filter includes a capacitor to which an AC power source is provided. The discharging device rectifies and samples the AC power source. The discharging device generates a reference voltage according to a peak voltage of a generated sampling signal, generates an AC power source cutoff detection signal according to a comparison signal generated by comparing the sampling signal and a reference voltage, and discharges the capacitor through a discharging register according to the AC power source cutoff detection signal. | 05-03-2012 |
20120201055 | POWER SUPPLY AND APPARATUS AND METHOD FOR CONTROLLING LINK VOLTAGE CONTROL SWITCH - A power supply includes a rectifier for rectifying an AC line voltage to generate a link voltage, a link capacitor for charging the link voltage, a control switch for controlling charge of the link capacitor, a converter for converting the link voltage to a DC voltage, and a switch controller. When the converter operates in a standby operation mode, the switch controller controls on-off of the control switch through a pulse signal having an on-time determined based on a peak value of a detected AC line voltage. | 08-09-2012 |
20130258722 | PHASE-CUT PRE-REGULATOR AND POWER SUPPLY COMPRISING THE SAME - A power supply includes a phase-cut pre-regulator. The phase-cut pre-regulator comprises a switching device connected between a line voltage and an input voltage of a bulk capacitor and a comparator receiving the line voltage and a reference voltage, comparing the line voltage with hysteresis reference voltages based on the reference voltage, and switching the switching device according to the compared result. | 10-03-2013 |