Multi-stage heat sink, cooling system with the same and method for controlling the same

Abstract

Disclosed herein is a multi-stage heat sink cooling system, including: at least one step surface in a direction of a surface to which cooling air is injected, wherein the step surface is any one of a step surface having a stair shape that is provided with a plurality of heat radiating plates each having a curve, a step surface provided with a plurality of heat radiating plates having a streamlined smooth curve, and a step surface provided with a plurality of heat radiating fins having a height difference. According to the preferred embodiments of the present invention, the cooling system with the multi-stage heat sink can cool heat generated from a heat radiating element using the multi-stage heat sink and the air injection part to improve a heat release rate.

What is claimed is: 
     
         1 . A multi-stage heat sink formed to have at least one step surface in a direction of a surface to which cooling air is injected. 
     
     
         2 . The multi-stage heat sink as set forth in  claim 1 , wherein the step surface is a step surface having a stair shape that is provided with a plurality of heat radiating plates each having a curve. 
     
     
         3 . The multi-stage heat sink as set forth in  claim 1 , wherein the step surface is provided with the plurality of heat radiating plates having a streamlined smooth curve. 
     
     
         4 . The multi-stage heat sink as set forth in  claim 1 , wherein the step surface is provided with a plurality of heat radiating fins having a height difference. 
     
     
         5 . A cooling system, comprising:
 a multi-stage heat sink including a surface having at least one step;   an air injection part coupled with step surfaces of the multi-stage heat sink and supplying cooling air; and   a control unit connected to the multi-stage heat sink to control cooling using the multi-stage heat sink and the air injection part.   
     
     
         6 . The cooling system as set forth in  claim 5 , wherein the multi-stage heat sink is provided with a plate-shaped member of which each heat radiating plate has a curve so as to be formed to have the step surfaces in a direction of a surface to which the cooling air is injected. 
     
     
         7 . The cooling system as set forth in  claim 5 , wherein the multi-stage heat sink is provided with a plurality of heat radiating plates having a streamlined smooth curve so as to be formed to have the step surfaces in a direction of a surface to which the cooling air is injected. 
     
     
         8 . The cooling system as set forth in  claim 5 , wherein the multi-stage heat sink is formed to have a plurality of heat radiating fins having a height difference so as to be formed to have the step surfaces in a direction of a surface to which the cooling air is injected. 
     
     
         9 . The cooling system as set forth in  claim 5 , further comprising:
 a temperature sensor provided at one portion of the multi-stage heat sink,   wherein temperature information of the multi-stage heat sink detected by the temperature sensor is transferred to the control unit.   
     
     
         10 . The cooling system as set forth in  claim 5 , wherein the air injection part is separately provided with a plurality of injection holes from a bottom portion thereof and injects the cooling air to each step surface of the multi-stage heat sink through the injection holes from an air pump connected to the control unit. 
     
     
         11 . The cooling system as set forth in  claim 10 , wherein the control unit controls airflow rate, initial temperature, and flow velocity of the cooling air through the air pump. 
     
     
         12 . The cooling system as set forth in  claim 5 , wherein the multi-stage heat sink is mounted at one portion of a heat radiation object via a heat conductive paste. 
     
     
         13 . A method for controlling cooling, comprising:
 starting a cooling process by controlling an air pump by a control unit so as to inject cooling air to a multi-stage heat sink through an air injection part;   determining, by the control unit, whether temperature of the multi-stage heat sink or the cooling air is higher than set cooling reference temperature;   correcting, by the control unit, cooling conditions if it is determined that the temperature of the multi-stage heat sink or the cooling air is higher than the set cooling reference temperature; and   performing, by the control unit, cooling using the multi-stage heat sink and the cooling air according to the corrected cooling conditions.   
     
     
         14 . The method as set forth in  claim 13 , wherein in the starting of the cooling process, the air injection part includes a plurality of injection holes along steps of the multi-stage heat sink and each of the injection holes is engaged with step surfaces of the multi-stage heat sink. 
     
     
         15 . The method as set forth in  claim 13 , wherein in the starting of the cooling process, the control unit receives temperature information of the multi-stage heat sink detected by a temperature sensor mounted at one portion of the multi-stage heat sink in real time. 
     
     
         16 . The method as set forth in  claim 13 , wherein in the correcting of the cooling conditions, the cooling conditions include airflow rate, initial temperature, and flow velocity of the cooling air.