Correction circuit limiting inrush current
First Claim
1. A power factor correction circuit correcting a power factor of AC voltage, comprising:
- an AC noise removing unit for removing a noise of AC voltage,a rectifying unit rectifying the AC voltage having noise removed to have the same polarity;
a power factor correction unit generating a power-factor-corrected voltage by correcting the rectified voltage;
a smoothing unit generating a smoothed voltage by smoothing the power-factor-corrected voltage;
an inrush current limiting unit providing a limited current by limiting an inrush current generated by the AC voltage in a transient state and stopping providing a current to the smoothing unit;
a current control signal generation unit for generating a current control signal for controlling the rectifying unit and the inrush current limiting unit;
wherein the current control signal generation unit controls a current flow to the inrush current limiting unit according to whether the power factor correction circuit is in a steady state,wherein the current control signal generation unit prevents a current flow to the inrush current limiting unit by determining that the power factor correction circuit is in the steady state when a value of the smoothed voltage is equal to or greater than a reference voltage value,wherein the current control signal generation unit allows a current flow to the inrush current limiting unit by determining the power factor correction circuit is in the transient state when the value of the smoothed voltage is less than the reference voltage value.
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Accused Products
Abstract
Provided is a power factor correction circuit correcting a power factor of AC voltage. The power factor correction circuit includes: a rectifying unit stopping rectifying the AC voltage in a transient state and generating an rectified voltage by rectifying the AC voltage in a steady state; a power factor correction unit generating a power-factor-corrected voltage by correcting the rectified voltage; a smoothing unit generating a smoothed voltage by smoothing the power-factor-corrected voltage; and an inrush current limiting unit providing a limited current by limiting an inrush current generated by the AC voltage in the transient state and stopping providing a current to the smoothing unit.
26 Citations
14 Claims
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1. A power factor correction circuit correcting a power factor of AC voltage, comprising:
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an AC noise removing unit for removing a noise of AC voltage, a rectifying unit rectifying the AC voltage having noise removed to have the same polarity; a power factor correction unit generating a power-factor-corrected voltage by correcting the rectified voltage; a smoothing unit generating a smoothed voltage by smoothing the power-factor-corrected voltage; an inrush current limiting unit providing a limited current by limiting an inrush current generated by the AC voltage in a transient state and stopping providing a current to the smoothing unit; a current control signal generation unit for generating a current control signal for controlling the rectifying unit and the inrush current limiting unit; wherein the current control signal generation unit controls a current flow to the inrush current limiting unit according to whether the power factor correction circuit is in a steady state, wherein the current control signal generation unit prevents a current flow to the inrush current limiting unit by determining that the power factor correction circuit is in the steady state when a value of the smoothed voltage is equal to or greater than a reference voltage value, wherein the current control signal generation unit allows a current flow to the inrush current limiting unit by determining the power factor correction circuit is in the transient state when the value of the smoothed voltage is less than the reference voltage value. - View Dependent Claims (2, 3, 4, 5)
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6. A power factor correction circuit comprising:
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a capacitor for removing an AC noise; a plurality of bridge diodes; a power factor correction unit having an input terminal connected to an output terminal of the plurality of bridge diodes; a smoothing capacitor having one end connected to an output terminal of the power factor correction unit; a switch having one end to which AC voltage is applied; a diode having one end connected to the other end of the switch; a resistor having one end connected to the other end of the diode; and a current control signal generation unit for generating a current control signal for controlling the rectifying unit and an inrush current limiting unit; wherein the current control signal generation unit controlling a current flow to the inrush current limiting unit according to whether the power factor correction circuit is in a steady state, wherein the current control signal generation unit prevents a current flow to the inrush current limiting unit by determining that the power factor correction circuit is in the steady state when a value of the smoothed voltage is equal to or greater than a reference voltage value, wherein the current control signal generation unit allows a current flow to the inrush current limiting unit by determining the power factor correction circuit is in a transient state when the value of the smoothed voltage is less than the reference voltage value. - View Dependent Claims (7, 8, 9)
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10. A method of operating a power factor correction circuit correcting a power factor of AC voltage, the method comprising:
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determining whether the power factor correction circuit is in a transient state; limiting an inrush current generated by the AC voltage when the power factor correction circuit in the transient state; generating a rectified voltage by rectifying the AC voltage when the power factor correction circuit is in a steady state; generating a power-factor-corrected voltage by power-factor-correcting the rectified voltage; and generating a smoothed voltage by smoothing the power-factor-corrected voltage; controlling whether to limit the inrush current according to whether the power factor correction circuit is in the steady state by generating a current control signal, wherein the determining of whether the power factor correction circuit is in the transient state comprises determining that the power factor correction circuit is in the steady state when a value of the smoothed voltage is equal to or greater than a reference voltage value. - View Dependent Claims (11, 12, 13, 14)
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Specification