Refrigerator

Abstract

A motor driving device for a refrigerator is disclosed. The refrigerator includes a condenser to condense refrigerant, a fan module mounted to one surface of the condenser so as to blow air; a first circuit unit including a microprocessor to output a speed command signal and a filter unit connected to an output terminal of the microprocessor so as to filter the output speed command signal; and a second circuit unit including an inverter controller to output an inverter switching control signal on the basis of the filtered speed command signal and an inverter to convert an input DC power into a predetermined-frequency AC power by performing a switching operation in response to the inverter switching control signal and to output the AC power to a fan motor contained in the fan module. Thus, when the motor is driven, noise is greatly reduced.

What is claimed is: 
     
         1 . A refrigerator comprising:
 a condenser to condense a refrigerant;   a fan module mounted to one surface of the condenser so as to blow air;   a first circuit unit including a microprocessor to output a speed command signal and a filter unit connected to an output terminal of the microprocessor so as to filter the output speed command signal; and   a second circuit unit including an inverter controller to output an inverter switching control signal on the basis of the filtered speed command signal and an inverter to convert an input DC power into a predetermined-frequency AC power by performing a switching operation in response to the inverter switching control signal and to output the AC power to a fan motor contained in the fan module.   
     
     
         2 . The refrigerator according to  claim 1 , wherein:
 the condenser is formed by screw-stacking a refrigerant pipe in which the refrigerant flows; and   the fan module is configured to blow air in a screw-shaped axis direction foamed by the refrigerant pipe of the condenser.   
     
     
         3 . The refrigerator according to  claim 1 , wherein the filter unit includes at least one resistor element and at least one capacitor element. 
     
     
         4 . The refrigerator according to  claim 1 , wherein the second circuit unit further includes a noise reduction unit to reduce noise of the filtered speed command signal. 
     
     
         5 . The refrigerator according to  claim 4 , wherein the noise reduction unit includes at least one resistor element. 
     
     
         6 . The refrigerator according to  claim 3 , wherein the capacitor element has capacitance of less than 1 μF. 
     
     
         7 . The refrigerator according to  claim 5 , wherein the resistor element contained in the noise reduction unit has impedance of 1 kΩ˜10 kΩ. 
     
     
         8 . The refrigerator according to  claim 1 , wherein the filtered speed command signal is a PWM-based signal. 
     
     
         9 . The refrigerator according to  claim 1 , wherein the inverter controller includes:
 a velocity calculation unit to calculate speed on the basis of an output current flowing in the fan motor;   a current command generator to generate a current command value on the basis of the calculated speed and the speed command signal;   a voltage command generator to generate a voltage command value on the basis of the current command value and an output current flowing in the motor; and   a switching control signal output unit to output the PWM-based switching control signal on the basis of the voltage command value.   
     
     
         10 . The refrigerator according to  claim 1 , wherein the first circuit unit further outputs operation power of the second circuit unit. 
     
     
         11 . The refrigerator according to  claim 1 , wherein the first circuit unit and the second circuit unit are implemented as separate circuit boards spaced apart from each other. 
     
     
         12 . A refrigerator comprising:
 a condenser to condense a refrigerant;   a fan module mounted to one surface of the condenser so as to blow air;   a first circuit unit including a microprocessor to output a speed command signal; and   a second circuit unit including a noise reduction unit to reduce noise of the speed command signal, an inverter controller to output an inverter switching control signal on the basis of the noise-reduced speed command signal, and an inverter to convert an input DC power into a predetermined-frequency AC power by performing a switching operation in response to the inverter switching control signal and to output the AC power to a fan motor contained in the fan module.   
     
     
         13 . The refrigerator according to  claim 12 , wherein:
 the condenser is formed by screw-stacking a refrigerant pipe in which the refrigerant flows; and   the fan module is configured to blow air in a screw-shaped axis direction formed by the refrigerant pipe of the condenser.   
     
     
         14 . The refrigerator according to  claim 12 , wherein the noise reduction unit includes at least one resistor element. 
     
     
         15 . The refrigerator according to  claim 14 , wherein the resistor element contained in the noise reduction unit has impedance of 1 kΩ˜10 kΩ. 
     
     
         16 . The refrigerator according to  claim 12 , wherein the speed command signal is a PWM-based signal. 
     
     
         17 . The refrigerator according to  claim 12 , wherein the inverter controller includes:
 a velocity calculation unit to calculate speed on the basis of an output current flowing in the fan motor;   a current command generator to generate a current command value on the basis of the calculated speed and the speed command signal;   a voltage command generator to generate a voltage command value on the basis of the current command value and an output current flowing in the motor; and   a switching control signal output unit to output the PWM-based switching control signal on the basis of the voltage command value.   
     
     
         18 . The refrigerator according to  claim 12 , wherein the first circuit unit further outputs operation power of the second circuit unit. 
     
     
         19 . The refrigerator according to  claim 12 , wherein the first circuit unit and the second circuit unit are implemented as separate circuit boards spaced apart from each other. 
     
     
         20 . A refrigerator comprising:
 a fan motor;   a first circuit unit including a microprocessor to output a speed command signal and a filter unit connected to an output terminal of the microprocessor so as to filter the output speed command signal; and   a second circuit unit including a noise reduction unit to reduce noise of the filtered speed command signal, an inverter controller to output an inverter switching control signal on the basis of the noise-reduced speed command signal, and an inverter to convert an input DC power into a predetermined-frequency AC power by performing a switching operation in response to the inverter switching control signal and to output the AC power to the fan motor.