Abstract: Disclosed herein are an overload and short-circuit sensing circuit and a converter protecting circuit and method. The overload and short-circuit sensing circuit includes: an overcurrent sensing unit sensing a primary current of a converter; a voltage level adjusting unit adjusting a voltage level of the sensed primary current; a rectifying unit rectifying the signal adjusted by the voltage level adjusting unit; a short-circuit sensing unit sensing a current induced to a primary side of the converter due to a short-circuit or an overcurrent at a secondary side of the converter, separately from the overcurrent sensing unit; and a delay unit delaying the signal provided from the rectifying unit and the induced current sensing signal provided from the short-circuit sensing unit and providing the delayed signals to a control circuit for protecting the converter.

Abstract: There are provided a phase shift circuit and a power factor correction circuit including the same. The phase shift circuit includes a switching circuit unit charging power in or discharging power from a capacitor through a plurality of switching devices and comparing a voltage of the capacitor with a predetermined reference voltage, and a clock generating unit generating a reference clock signal based on an output of the switching circuit unit, wherein the switching circuit unit turns the plurality of switching devices on or off, based on currents from inductors respectively included in a main circuit and a sub-circuit of a power factor correction circuit to determine a polarity of the voltage of the capacitor.

Abstract: A phase shift circuit may include a ramp generation unit charging or discharging a capacitor connected to a switch device to generate a ramp signal, a reference signal generation unit generating a predetermined reference signal from the ramp signal, and a comparison unit comparing the ramp signal with the reference signal to generate a clock signal, wherein at least one of the reference signal generation unit and the comparison unit changes a negative or positive value of offset components included in the reference signal or the ramp signal within every operating period of the switch device.

Abstract: Disclosed herein are a signal generator having high efficiency and a PFC converter using the same. According to an exemplary embodiment of the present disclosure, a PFC converter includes: a converter unit including an inductor and a switch which switches a flow of driving current in the inductor by a turn on or turn off operation; and a signal generator outputting a turn on signal or a turn off signal switching the switch and when a magnitude of the driving current is smaller than a preset value, keeping the turn on signal long to enable the magnitude of the driving current to reach the preset value.

Abstract: There is provided a power factor correction circuit including: a power conversion circuit unit controlling an inductor current according to a switching signal applied to a main switch to convert an external input voltage into an output voltage having a predetermined range; an imbalance detection circuit outputting an imbalance state signal when the external input voltage is in an unbalanced state by using the inductor current; and a soft start circuit unit performing soft starting by adjusting the switching signal when the imbalance state signal is output by the imbalance detection circuit unit.

Abstract: A detector having an offset cancellation function, and a power factor correction apparatus and a power supplying apparatus having the same are provided. The detector detecting a level of an input signal may include a level shifter shifting the level of the input signal, and a comparator amplifying a voltage difference between the level of the signal shifted by the level shifter and a ground, and providing a compensation current according to an offset generated at the time of amplifying a voltage to cancel the offset.

Abstract: The present invention relates to a PFC control circuit, an active PFC circuit, and a PFC control method. According to an embodiment of the present invention, a PFC control circuit including: an inductor current sensing unit for sensing an inductor current of a PFC circuit; an output voltage feedback unit for outputting a feedback output signal; a sensing and feedback signal application unit for outputting a sensing voltage signal during switching duty on of the PFC circuit and adding the feedback output signal to the sensing voltage signal to output the added signal during switching duty off of the PFC circuit; and a PFC control unit for generating a comparison signal and generating a duty control signal from the comparison signal and a first reference signal to make variations due to an internal offset be removed or reduced is provided.

Abstract: There is provided a power factor correction circuit capable of correcting a power factor of a power converting module through increasing an input current by switching a main switching element of a power converting module on the basis of a first reference wave having a slope based on a first signal and an error voltage, in particular, by limiting a switching frequency on the basis of a first reference wave having a slope based on a second signal lower than a first signal and an error voltage when the switching frequency of the main switching element increases because an input voltage of the power converting module is low.

Abstract: There is provided a power factor correction circuit including: a power conversion circuit unit controlling an inductor current according to a switching signal applied to a main switch to convert an external input voltage into an output voltage having a predetermined range; an imbalance detection circuit outputting an imbalance state signal when the external input voltage is in an unbalanced state by using the inductor current; and a soft start circuit unit performing soft starting by adjusting the switching signal when the imbalance state signal is output by the imbalance detection circuit unit.

Abstract: There are provided a phase shift circuit and a power factor correction circuit including the same. The phase shift circuit includes a switching circuit unit charging power in or discharging power from a capacitor through a plurality of switching devices and comparing a voltage of the capacitor with a predetermined reference voltage, and a clock generating unit generating a reference clock signal based on an output of the switching circuit unit, wherein the switching circuit unit turns the plurality of switching devices on or off, based on currents from inductors respectively included in a main circuit and a sub-circuit of a power factor correction circuit to determine a polarity of the voltage of the capacitor.

Abstract: Disclosed herein are an overload and short-circuit sensing circuit and a converter protecting circuit and method. The overload and short-circuit sensing circuit includes: an overcurrent sensing unit sensing a primary current of a converter; a voltage level adjusting unit adjusting a voltage level of the sensed primary current; a rectifying unit rectifying the signal adjusted by the voltage level adjusting unit; a short-circuit sensing unit sensing a current induced to a primary side of the converter due to a short-circuit or an overcurrent at a secondary side of the converter, separately from the overcurrent sensing unit; and a delay unit delaying the signal provided from the rectifying unit and the induced current sensing signal provided from the short-circuit sensing unit and providing the delayed signals to a control circuit for protecting the converter.

Abstract: A relaxation oscillator includes a ramp wave generator configured to generate a ramp wave by complementary first capacitor module charged and discharged according to a first switching signal and second capacitor module charged and discharged according to a second switching signal, a negative feedback circuit unit configured to generate a compensation voltage for compensating an error between the ramp wave and a reference voltage through a feedback of the ramp wave, and a switching signal generator configured to generate the first switching signal and the second switching signal from the compensation voltage and the ramp wave, including a peak voltage storage unit configured to store a peak voltage of the ramp wave that is controlled to be equal to the reference voltage based on the compensation voltage and a peak voltage transfer unit configured to transfer the peak voltage of the ramp wave to the negative feedback unit.

Abstract: There is provided relaxation oscillator. The relaxation oscillator includes: a ramp wave generator generating ramp waves by a complementary operation between a first capacitor module charged and discharged according to a first switching signal and a second capacitor module charged and discharged according to a second switching signal; a negative feedback circuit unit generating a compensation voltage for compensating errors with reference voltage by being fedback with the ramp waves; and a switching signal generator generating the first switching signal controlling the charging and discharging of the first capacitor module and the second switching signal controlling the charging and discharging of the second capacitor module from the compensation voltage and the ramp waves. As a result, the present invention can generate ramp waves having a stable frequency while preventing a frequency from being changed due to a delay or an offset of the comparator.

Abstract: There is provided a power factor correction circuit capable of correcting a power factor of a power converting module through increasing an input current by switching a main switching element of a power converting module on the basis of a first reference wave having a slope based on a first signal and an error voltage, in particular, by limiting a switching frequency on the basis of a first reference wave having a slope based on a second signal lower than a first signal and an error voltage when the switching frequency of the main switching element increases because an input voltage of the power converting module is low.

Abstract: Provided is an initial driving circuit of a backlight unit having a lamp unit provided with a plurality of lamps. In the initial driving circuit, an error amplifying unit 100 detects an error voltage VERO between a feedback voltage VFB corresponding to a current flowing to the lamp unit and a preset first reference voltage Vref11. A soft signal generation unit 200 generates a soft start signal VSS of the lamp unit. A high-frequency signal driving signal generating unit 300 generates a high-frequency driving signal VHF of the of the lamp unit. A high-frequency driving termination determining unit 400 generates a high-frequency driving termination signal SHE when the error voltage VERO is equal in voltage level to the soft start signal VSS. A high-frequency driving signal blocking unit 500 blocks the high-frequency driving signal VHF in advance when the high-frequency driving termination signal SHE is inputted.

Abstract: The present invention provides an apparatus for lifting up and down of window glass for a vehicle and method thereof that is controlled by a switch called a shuttle switch to move the window glass automatically to a desired position according to the rotation of the shuttle switch without visually checking the movement of the window glass and without taking eyes away from the road by a user. The present invention includes a reversible motor for moving the window glass, a controller for moving and stopping the window glass to the desired position corresponding to the rotation of the shuttle switch, and a motor sensor providing feedback to the controller for stopping the movement of the window glass.