Abstract: There is provided an alternating current (AC) detection circuit for power supply, the AC circuit including: a rectifying part rectifying an AC voltage; a voltage division part dividing the voltage rectified by the rectifying part according to a preset division ratio; a voltage stabilization circuit part stabilizing the voltage divided by the voltage division part; and a first square wave generating part comparing the voltage stabilized by the voltage stabilization circuit part with an internal reference voltage, and generating a first square wave signal having a duty ratio according to comparison results between the stabilized voltage and the internal reference.

Abstract: There is provided an alternating current (AC) detection circuit for a power supply, the circuit including: a rectifying part rectifying an AC voltage; a voltage division part dividing the voltage rectified by the rectifying part according to a preset division ratio; a voltage stabilization circuit part stabilizing the voltage divided by the voltage division part; a comparing part comparing the voltage stabilized by the voltage stabilization circuit part with an internal reference voltage and generating an input detection signal when the stabilized voltage is higher than the internal reference voltage; and an output part outputting an AC detection signal when the input detection signal is inputted from the comparing part.

Abstract: Provided is a switching mode power supply circuit for plasma display panel, which includes an EMI filter unit, a PFC unit, an output unit, and a standby unit. The EMI filter unit may include a first line filter connected to a commercial line input power, a first capacitor and discharge resistor connected to the first line filter, a second line filter connected to the first capacitor and discharge resistor, a second capacitor connected to the second line filter, and a relay unit disposed between the first line filter and the first capacitor and discharge resistor. The standby unit may be connected to a contact point of the first line filter and the relay unit.

Abstract: The present invention relates to a switching mode power supply circuit for a plasma display panel comprising an input unit, a PFC (Power Factor Correction) unit, an output unit and a standby unit, wherein the standby unit includes a standby block for outputting a standby voltage by being connected to an AC filter stage of the input unit, a sequence block for sequentially applying power of the output unit and a control block which is connected between the standby block and the sequence block and inputs the standby voltage outputted from the standby block to the sequence block only in case that a PS_ON signal is applied.

Abstract: There is provided an alternating current (AC) detection circuit for power supply, the AC circuit including: a rectifying part rectifying an AC voltage; a voltage division part dividing the voltage rectified by the rectifying part according to a preset division ratio; a voltage stabilization circuit part stabilizing the voltage divided by the voltage division part; and a first square wave generating part comparing the voltage stabilized by the voltage stabilization circuit part with an internal reference voltage, and generating a first square wave signal having a duty ratio according to comparison results between the stabilized voltage and the internal reference

Abstract: There is provided an alternating current (AC) detection circuit for a power supply, the circuit including: a rectifying part rectifying an AC voltage; a voltage division part dividing the voltage rectified by the rectifying part according to a preset division ratio; a voltage stabilization circuit part stabilizing the voltage divided by the voltage division part; a comparing part comparing the voltage stabilized by the voltage stabilization circuit part with an internal reference voltage and generating an input detection signal when the stabilized voltage is higher than the internal reference voltage; and an output part outputting an AC detection signal when the input detection signal is inputted from the comparing part.

Abstract: The present invention relates to a switching mode power supply circuit for a plasma display panel comprising an input unit, a PFC (Power Factor Correction) unit, an output unit and a standby unit, wherein the standby unit includes a standby block for outputting a standby voltage by being connected to an AC filter stage of the input unit, a sequence block for sequentially applying power of the output unit and a control block which is connected between the standby block and the sequence block and inputs the standby voltage outputted from the standby block to the sequence block only in case that a PS_ON signal is applied.

Abstract: Provided is a switching mode power supply circuit for plasma display panel, which includes an EMI filter unit, a PFC unit, an output unit, and a standby unit. The EMI filter unit may include a first line filter connected to a commercial line input power, a first capacitor and discharge resistor connected to the first line filter, a second line filter connected to the first capacitor and discharge resistor, a second capacitor connected to the second line filter, and a relay unit disposed between the first line filter and the first capacitor and discharge resistor. The standby unit may be connected to a contact point of the first line filter and the relay unit.