Abstract: A memory device, and a method of testing the memory device for failure, includes a first chip including a memory cell array and a second chip overlapping with the first chip. The second chip includes: a semiconductor substrate including a peripheral circuit area and a lower test area; a plurality of sub-test pads and an input pad, disposed on the lower test area of the semiconductor substrate and spaced apart from each other; a plurality of sub-test circuits respectively connected to the plurality of sub-test pads; and a detection circuit connected to a plurality of terminals of the plurality of sub-test circuits, the detection circuit configured to output a detection signal changed according to a plurality of signals input from the plurality of terminals.

Abstract: Disclosed herein is a refrigerator configured to delay increase in temperature of a storage compartment by lowering temperature of air that is heated by a defrost heater. A refrigerator includes a defrost heater, a lower cool air duct including a first flow path configured to guide cool air generated by the evaporator to be supplied to the storage compartment and an upper cool air duct disposed in an upper side of the lower cool air duct and provided with a second flow path configured to guide cool air generated by the evaporator to be supplied to the storage compartment. A cool pack in which cold storage material is filled stores cold storage energy from cool air that is delivered to the second flow path to decrease a temperature of air passing via the second flow path, so that increase of an internal temperature of the storage compartment is delayed.

Abstract: Disclosed herein is a refrigerator configured to delay increase in temperature of a storage compartment by lowering temperature of air that is heated by a defrost heater. A refrigerator includes a defrost heater, a lower cool air duct including a first flow path configured to guide cool air generated by the evaporator to be supplied to the storage compartment and an upper cool air duct disposed in an upper side of the lower cool air duct and provided with a second flow path configured to guide cool air generated by the evaporator to be supplied to the storage compartment. A cool pack in which cold storage material is filled stores cold storage energy from cool air that is delivered to the second flow path to decrease a temperature of air passing via the second flow path, so that increase of an internal temperature of the storage compartment is delayed.

Abstract: Disclosed herein is a refrigerator configured to delay increase in temperature of a storage compartment by lowering temperature of air that is heated by a defrost heater. A refrigerator includes a defrost heater, a lower cool air duct including a first flow path configured to guide cool air generated by the evaporator to be supplied to the storage compartment and an upper cool air duct disposed in an upper side of the lower cool air duct and provided with a second flow path configured to guide cool air generated by the evaporator to be supplied to the storage compartment. A cool pack in which cold storage material is filled stores cold storage energy from cool air that is delivered to the second flow path to decrease a temperature of air passing via the second flow path, so that increase of an internal temperature of the storage compartment is delayed.

Abstract: Disclosed herein is a refrigerator configured to delay increase in temperature of a storage compartment by lowering temperature of air that is heated by a defrost heater. A refrigerator includes a defrost heater, a lower cool air duct including a first flow path configured to guide cool air generated by the evaporator to be supplied to the storage compartment and an upper cool air duct disposed in an upper side of the lower cool air duct and provided with a second flow path configured to guide cool air generated by the evaporator to be supplied to the storage compartment. A cool pack in which cold storage material is filled stores cold storage energy from cool air that is delivered to the second flow path to decrease a temperature of air passing via the second flow path, so that increase of an internal temperature of the storage compartment is delayed.

Abstract: Disclosed herein is a refrigerator. The refrigerator includes a body including a storage room therein, a machine room formed in the body and separated from the storage room, and a cool air generating unit including a compressor and a condenser arranged inside the machine room and providing cool air to the storage room. Here, the condenser includes a first condensing portion which faces a rear surface of the machine room and a second condensing portion which is bent from the first condensing portion and faces a first side of the machine room.

Abstract: The present invention discloses a control apparatus for a linear compressor which can vary a cooling force and prevent an inrush current. The control apparatus for the linear compressor includes a coil winding body laminated on the linear compressor, a first capacitor connected in series to the coil winding body, a capacitance varying unit being formed in a parallel structure to the first capacitor, and having a capacitor switch, and a control unit for inducing an output change of the linear compressor, by varying the whole capacitance of the control apparatus by controlling the capacitor switch.

Abstract: The present invention discloses a refrigerator which can perform direct cooling of circulating cool air by natural convection in a freezing chamber (F) and a refrigerating chamber (R), and which can selectively perform indirect cooling of circulating cool air by forcible convection in the refrigerating chamber. It is like that, frost or condensed water formed in the refrigerating chamber (R) of the direct cooling type refrigerator does not Influence the inside of the refrigerating chamber. In addition, the refrigerator efficiently performs a defrosting operation of the refrigerating chamber (R), sanitarily performs a cooling operation, and maintains uniform cooling performance.

Abstract: The present invention discloses a defrost operating method for a refrigerator which performs a defrost operation by controlling operations of a compressor and a fan on the basis of a continuous operation time of the compressor and surface temperatures of evaporators to prevent frost from being formed on the evaporators, when cool air is generated in a freezing chamber and a refrigerating chamber by circulating refrigerants through a refrigeration cycle built in a refrigerator main body and forcibly circulated bX rotating the fan. The defrost operating method for the refrigerator can omit a general defrosting heater by performing the defrost operation by using the compressor and the fan. In addition, the defrost operating method for the refrigerator improves heat exchange efficiency and reduces power consumption by efficiently performing the defrost operation.

Abstract: The present invention discloses a control apparatus for a linear compressor which can vary a cooling force and prevent an inrush current. The control apparatus for the linear compressor includes a coil winding body laminated on the linear compressor, a first capacitor connected in series to the coil winding body, a capacitance varying unit being formed in a parallel structure to the first capacitor, and having a capacitor switch, and a control unit for inducing an output change of the linear compressor, by varying the whole capacitance of the control apparatus by controlling the capacitor switch.

Abstract: The present invention discloses a refrigerator which can perform direct cooling of circulating cool air by natural convection in a freezing chamber (F) and a refrigerating chamber (R), and which can selectively perform indirect cooling of circulating cool air by forcible convection in the refrigerating chamber. It is like that, frost or condensed water formed in the refrigerating chamber (R) of the direct cooling type refrigerator does not Influence the inside of the refrigerating chamber. In addition, the refrigerator efficiently performs a defrosting operation of the refrigerating chamber (R), sanitarily performs a cooling operation, and maintains uniform cooling performance.

Abstract: act The present invention discloses a defrost operating method for a refrigerator which performs a defrost operation by controlling operations of a compressor and a fan on the basis of a continuous operation time of the compressor and surface temperatures of evaporators to prevent frost from being formed on the evaporators, when cool air is generated in a freezing chamber and a refrigerator chamber by circulating refrigerants through a refrigeration cycle built in a refrigerator main body and forcibly circulated bX rotating the fan. The defrost operating method for the refrigerator can omit a general heater by performing the defrost operation by using the compressor and the fan. In addition, the defrost operating method for the refrigerator improves heat exchange efficiency and reduces power consumption by efficiently performing the defrost operation.

Abstract: The present invention discloses a defrost apparatus of a refrigerator which can defrost an evaporator by a defrost heater, when moisture of the ambient air of the evaporator is frozen on the surface of the evaporator. The defrost apparatus of the refrigerator includes a pair of evaporators and a pair of defrost heaters to selectively defrost the pair of evaporators. A path varying means for guiding air flow is installed near the pair of evaporators. The air is not supplied to the defrosted evaporator, for performing the defrosting operation. The air is supplied to the non-defrosted evaporator, for performing the cooling operation. As a result, the defrosting operation is efficiently performed, and the temperature does not sharply increase in freezing and refrigerating chambers, so that the food can be maintained fresh for an extended period of time.