Refrigerator and operating method thereof

1. A refrigerator comprising a compressor that supplies chilled air into a refrigerator compartment and a freezer compartment, the refrigerator comprising:

one of a variable resistor or a negative temperature coefficient thermistor that prevents an excessive current from being supplied when an input power is supplied to the refrigerator;

a bypass switch connected to one of the variable resistor or the negative temperature coefficient thermistor to bypass the input power;

a voltage measuring device that measures a voltage of rectified and smoothed input power;

an inverter that re-converts the rectified and smoothed input power into AC power and applies the converted AC power to the compressor; and

a controller that controls the input power input through one of the variable resistor or the negative temperature coefficient thermistor to bypass to the bypass switch when the voltage measured by the voltage measuring device is greater than a reference voltage, and creates a switching signal for controlling the inverter and applies the switching signal to the inverter, when the voltage measured by the voltage measuring device is greater than the reference voltage, to recover an inrush current preventing function of one of the variable resistor or the negative temperature coefficient thermistor, and to drive the compressor, wherein when a re-driving command from the controller to the compressor is input after the compressor is driven for a predetermined time period and is stopped, the controller controls the compressor to re-drive immediately, so that the refrigerator immediately re-operates, wherein a resistance of one of the variable resistor or the negative temperature coefficient thermistor decreases due to heat generated when an electric power is applied, and increases as the heat decreases when the electric power is not applied or current of the applied electric power decreases, wherein when the input power is bypassed, the current flowing through one of the variable resistor or the negative temperature coefficient thermistor decreases or does not flow so that the resistance of one of the variable resistor or the negative temperature coefficient thermistor increases and the inrush current preventing function of one of the variable resistor or the negative temperature coefficient thermistor recovers, and wherein the reference voltage is set as a predetermined operational voltage for driving the compressor motor.

2. The refrigerator of claim 1 , wherein the bypass switch comprises a relay connected parallel to both ends of the one of the variable resistor or the negative temperature coefficient thermistor.

3. The refrigerator of claim 1 , wherein the voltage measuring device is connected to both ends of a capacitor that smoothes the rectified input power to measure the voltage.

4. A method of operating a refrigerator, comprising:

inputting an input power through one of the variable resistor or the negative temperature coefficient thermistor and rectifying and smoothing the same;

measuring a voltage of the smoothed input power;

re-converting the rectified and smoothed input power into AC power and applying the converted AC power to a compressor;

controlling a bypass switch connected the one of the variable resistor or the negative temperature coefficient thermistor such that the input power is bypassed when the measured voltage is greater than a reference voltage, and creating a switching signal for controlling an inverter and applying the switching signal to the inverter and driving the compressor; and

re-driving the compressor immediately when a re-driving command is input after the compressor is driven for a predetermined time period and is stopped, wherein when the input power is bypassed, a current flowing through the one of the variable resistor or the negative temperature coefficient thermistor decreases or does not flow so that a resistance of one of the variable resistor or the negative temperature coefficient thermistor increases and an inrush current preventing function of one of the variable resistor or the negative temperature coefficient thermistor recovers.

5. A refrigerator comprising a compressor that supplies chilled air into a refrigerator compartment and a freezer compartment, the refrigerator comprising:

one of a variable resistor or a negative temperature coefficient thermistor that prevents an excessive current from being supplied when an input power is supplied to the refrigerator;

a bypass switch connected to one of a variable resistor or a negative temperature coefficient thermistor to bypass the input power;

a voltage measuring device that measures a voltage of rectified and smoothed input power;

an inverter that re-converts the rectified and smoothed input power into the AC power and applies the converted AC power to the compressor; and

a controller that controls the input power input through one of a variable resistor or a negative temperature coefficient thermistor to bypass to the bypass switch when the voltage measured by the voltage measuring device is greater than a reference voltage, and creates a switching signal for controlling the inverter and applies the switching signal to the inverter, when the voltage measured by the voltage measuring device is greater than the reference voltage, to recover an inrush current prevention function of one of a variable resistor or a negative temperature coefficient thermistor, and to drive the compressor, wherein when a re-driving command from the controller to the compressor is input after the compressor is driven for a predetermined time period and is stopped, the controller controls the compressor to re-drive immediately, so that the refrigerator immediately operates, wherein the bypass switch comprises a relay connected parallel to both ends of one of a variable resistor or a negative temperature coefficient thermistor, and wherein the voltage measuring device is connected to both ends of a capacitor that smoothes the rectified input power to measure the voltage.

6. The refrigerator of claim 1 , further comprising:

a rectifying device that rectifies the input power into full wave rectification or half wave rectification; and

a smoothing device that smooths the rectified power into a direct current voltage with predetermined voltage.

7. The refrigerator of claim 6 , wherein the rectifying device includes four diodes.