Abstract:
A frequency up converter having a compact size and enhanced heat emission characteristics by improving an arrangement structure of circuit boards is provided. The frequency up converter can enhance the heat emission characteristics and also reduce an entire volume and weight by classifying the devices according to their heat emission characteristics, separately arranging boards in a multi-step structure, and installing a heat sink.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority to and the benefit of Korean Patent Application No. 2014-0058598, filed on May 15, 2014, the disclosure of which is incorporated herein by reference in its entirety. 
       BACKGROUND 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a frequency up converter, and more particularly, to a frequency up converter capable of enhancing heat emission characteristics and also having a compact size by improving an arrangement structure of a circuit board. 
         [0004]    2. Discussion of Related Art 
         [0005]    In radio frequency (RF) communication, a frequency up converter is a device for upconverting a signal generated in a modem into a transmission frequency. 
         [0006]    In satellite communication, heat is generated inside the frequency up converter for upconverting a frequency and increasing an output to a desired level. 
         [0007]    In order to emit the heat inside the frequency up converter to the outside, a heat sink protruding to the outside in the top and bottom of the frequency up converter is installed. 
         [0008]    The frequency up converter becomes bigger and heavier due to the heat sink located in both sides of the frequency up converter. 
         [0009]    Accordingly, a development of technology capable of simultaneously solving a heat/size/weight problem in the frequency up converter is needed. 
         [0010]    In this regard, Patent Reference 1 relates to technology capable of simply solving a heat emission problem of a high power device through a structural change of high frequency communication equipment (ODU), and includes a heat emission structure specific to a component in order to emit the heat of the component generating a large amount of heat like the high power device such as an amplifier, etc. 
         [0011]    That is, as shown in  FIG. 3 , referring to Patent Reference 1, a circuit board is installed inside a body  200  in which a plurality of emission fins are formed, a shield ring  400  having an excellent heat conductivity in which a groove surrounding only a high power device  100   h  among components installed in the circuit board is formed, is installed and absorbs heat generated from the high power device  100   h  and emits the absorbed heat to the outside. 
         [0012]    The conventional technology reduces a heat emission structure in a region which does not emit the heat by adding the heat emission structure specific to a device emitting a large amount of heat and slightly improves the heat emission characteristics in a region which emits a large amount of heat, but has limitations in miniaturization and weight minimizing due to a structure of emitting the heat to the top and bottom, that is, a structure in which the heat sink is installed in both of the top and bottom. 
         [0013]    Further, there is a problem in which a waterproofing function is degraded since a fixing member for fixing an inner configuration penetrates a housing. 
       SUMMARY OF THE INVENTION 
       [0014]    The present invention is directed to a frequency up converter in which devices are separately arranged on boards formed in a multi-step structure by classifying the devices according to their heat generation rate, a heat emission effect is increased by installing a heat transmission medium between the boards, and also miniaturization and weight minimizing are achieved. 
         [0015]    The present invention is further directed to a frequency up converter in which various electric or electronic devices constituting the frequency up converter are classified as a device having a relatively high heat generation rate and a device having a relatively low heat generation rate according to a heat generation rate, the classified devices are installed on a different boards, the boards are stacked in a multi-step structure, the heat generated in each board is effectively emitted by installing a heat transfer medium which is in contact with a heat sink between the boards, and thus heat emission efficiency is increased, miniaturization and weight minimizing are achieved. 
         [0016]    According to an aspect of the present invention, there is provided a frequency up converter having a compact size and enhanced heat emission characteristics, including: a heat sink  10  installed on one side inside a housing  10   h  and configured to emit heat generated in the inside to the outside; a first circuit board  20  installed on one side of the heat sink, and on which a low heat generating device having relatively low heat emission characteristics is installed; a second circuit board  30  installed at one side of the first circuit board, and on which a high heat generating device having relatively higher heat emission characteristics than the first circuit board is installed; and a third circuit board  50  installed to be spaced apart by a predetermined distance from the top of the first board  20 , on which a heat generating device having relatively lower heat emission characteristics than the second circuit board  30  and relatively higher heat emission characteristics than the first circuit board  20  is installed. 
         [0017]    The frequency up converter may further include an inner cover configured to protect the first circuit board from heat generated in a power supply installed on the third circuit board, and the third circuit board  50  includes the power supply having a high heat generation rate installed on one surface facing the inner cover and a DC circuit and a element installed on another surface which does not face the inner cover. 
         [0018]    The frequency up converter may further include: a heat transfer medium  60  configured between the inner cover and the power supply. 
         [0019]    The inner cover  40  may be installed to surround the first board  20 . 
         [0020]    The heat generating device including a power transistor (PT) and an amplifier (AMP) may be installed on the second circuit board  30  installed on the heat sink at one side of the first circuit board. 
         [0021]    The frequency up converter may further include a leakage prevention seal  70  installed between an inner wall of the housing  10   h  and the heat sink  10 . 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0022]    The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail exemplary embodiments thereof with reference to the accompanying drawings, in which: 
           [0023]      FIG. 1  is a structural diagram illustrating a frequency up converter having a compact size and enhanced heat emission characteristics according to one embodiment of the present invention; 
           [0024]      FIG. 2  is a structural diagram illustrating a frequency up converter having a compact and enhanced heat emission characteristics according to another embodiment of the present invention; and 
           [0025]      FIG. 3  is a structural diagram of a conventional frequency up converter. 
       
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0026]    The present invention may be variably modified and have various embodiments, specific embodiments are illustrated in accompanying drawings and will be described in the detailed description of exemplary embodiments. However, the exemplary embodiments described herein are not intended to limit the concept of the present invention, and should be understood as including every modification, equivalent, and alternative included in the spirit and scope of the present invention 
         [0027]    Similar numerals refer to similar components in the accompanying drawings. In the description of the present invention, when it is determined that a detailed description of the related art makes the gist of the present invention obscure, the detailed description thereof will be omitted. 
         [0028]    The present invention can achieve miniaturization by reducing an overall size by stacking and installing a plurality of boards in a multi-step structure, and can effectively emit heat by including a heat transfer means between the boards. 
         [0029]    The frequency up converter having a compact size and enhanced heat emission characteristics may have features in which devices or components are installed on two or more circuit boards  20 ,  30 , and  50  by classifying the devices or components constituting the frequency up converter, the circuit boards  20 ,  30 , and  50  are stacked and installed, and a heat sink  10  for emitting heat generated in the circuit boards  20 ,  30 , and  50  is included. 
         [0030]    As shown in  FIG. 1 , the heat sink  10  may be installed on one side of a housing  10   h  and include a plurality of cooling fins formed on the outer surface of the heat sink  10 , and thus effectively emit heat generated in the circuit boards  20 ,  30 , and  50  installed inside. 
         [0031]    Each of the circuit boards  20  and  30  among the circuit boards  20 ,  30 , and  50  may be installed to be in close contact with an inner surface of the heat sink  10 , and thus directly emit generated heat through the heat sink  10 . The circuit board  50  may transfer the heat to the heat sink  10  through a heat transfer means. 
         [0032]    The heat sink  10  may perform a function of emitting the heat generated from the circuit boards  20 ,  30 , and  50  constituting the frequency up converter described above, and also a function of supporting the circuit boards  20 ,  30 , and  50 . The heat sink  10  may be made of a metal or ceramic, etc. having excellent heat conductivity. 
         [0033]    The circuit boards  20 ,  30 , and  50  may be a board on which a circuit including devices(the term “device” comprise “electrical element”) or components having different heat emission characteristics is installed, and be separately arranged by grouping devices or components having similar heat emission characteristics. 
         [0034]    A first circuit board  20  among the circuit boards  20 ,  30 , and  50  may be a board on which a low heat generating device having relatively low heat emission characteristics is installed, and may be installed adjacent to the heat sink  10  as shown in  FIG. 1 , and a second circuit board  30  on which devices having relatively high heat emission characteristics are installed may be installed at one side of the first circuit board  20 . That is, a high heat generating device including a power transistor and an amplifier may be installed on the second circuit board  30  installed on the heat sink  10  at the one side of the first circuit board  20 . At this time, the heat generating device including the power transistor and the amplifier may be installed on the bottom of the second circuit board  30 , and emit the heat generated in the heat generating device through the heat sink  10  installed on the bottom of the second circuit board  30 . 
         [0035]    The second circuit board  30  may be a board on which a device or component having relatively higher heat emission characteristics than the devices constituting the first circuit board  20  is installed, and thus effectively emit heat inside the second circuit board  30  to the heat sink  10  by installing a cover  30   c  outside the second circuit board  30  and being in contact with the heat sink  10 . 
         [0036]    Further, the frequency up converter having a compact size and enhanced heat emission characteristics according to an embodiment of the present invention may install the devices and components on the third circuit board  50  by further classifying the heat emission characteristics of the devices or components. 
         [0037]    The third circuit board  50  may be stacked and installed to be spaced apart by a predetermined interval on the top of the first circuit board  20 . 
         [0038]    The third circuit board  50  may be a board on which a circuit including a component or device having relatively higher heat emission characteristics than a component or device installed on the first circuit board  20 , or components generating an unwanted spurious electronic wave is installed, and may include a power supply (PS) installed on one surface facing the first circuit board  20  and a direct current (DC) circuit and a DC device needed for driving control of the PS installed on another surface which does not face the first circuit board  20 . 
         [0039]    Other devices may not be influenced by the electronic wave generated in the devices constituting the third circuit board  50  by separating devices generating the unwanted electronic wave in the third circuit board  50 . 
         [0040]    An internal cover  40  may be included as a means for transferring heat generated in the high heat generating device or the PS installed on the third circuit board  50  to the heat sink  10 . 
         [0041]    That is, the devices installed on each circuit board constituting the frequency up converter having a compact size and enhanced heat emission characteristics may have a decreasing heat generation rate in order of the second circuit board, the third circuit board, and the first circuit board. 
         [0042]    As shown in  FIGS. 1 and 2 , the inner cover  40  may have features in which one side is in contact with the heat sink  10 , the first circuit board  20  is installed therein, heat generated in the high heat generating device or component of the third circuit board  50  is prevented from being transferred to the first circuit board  20 , and the heat generated in the third circuit board  50  is effectively transferred to the heat sink  10 . Accordingly, it may be desirable to manufacture the inner cover  40  using a material having excellent heat conductivity. 
         [0043]    As described above, it may be desirable to further install a heat transfer medium  60  between the inner cover  40  and the PS in order to increase heat emission efficiency of emitting the heat of the third circuit board  50  transferred to the heat sink  10  through the inner cover  40 , specifically, the heat generated in the PS. 
         [0044]    Of course, the heat transfer medium  60  may be manufactured with a material having excellent heat conductivity, one side of the heat transfer medium  60  may be in contact with the PS, and another side of the heat transfer medium  60  may be in contact with the outer surface of the inner cover  40 . 
         [0045]    The heat transfer medium  60  may be a liquid type in which a liquid having high heat transfer efficiency is stored or a solid type pad having the high heat transfer efficiency. 
         [0046]    As described above, the inner cover  40  may have a function of transferring the heat generated in the third circuit board  50  to the heat sink  10 , and also a function of protecting the first circuit board  20  from the heat generated in the third circuit board  50 . As shown in  FIGS. 1 and 2 , it may be desirable to design the inner cover  40  so that it surrounds the first circuit board  20 . 
         [0047]    A position of the third circuit board  50  may be exchanged with a position of the first circuit board  20  in order to easily emit the heat. However, when there is a space between the first circuit board  20  and peripheral media (a circuit board, a housing, etc.), the electronic wave generated in the first circuit board  20  may have an influence on an operation of a peripheral circuit. Accordingly, it may be desirable to manufacture the first circuit board  20  so that it is spaced apart from the peripheral circuit and is shielded by the inner cover  40 . In this case, it may be desirable to manufacture the first circuit board  20  so that it is in close contact with the housing  10   h  in order to install easily in the shielding state. 
         [0048]    Further, it may be desirable to design the housing  10   h  so that the frequency up converter having a compact size and enhanced heat emission characteristics according to an embodiment of the present invention prevents water from entering the housing  10   h  from the outside, and for this, it may be desirable to manufacture the housing  10   h  so that one side of the housing  10   h  has an open cylindrical shape and the inside of the housing is shielded by installing the heat sink  10  on the opened surface. Of course, the housing  10   h  can be manufactured so as to be divided and prevent leakage by further installing a leakage prevention packing at a portion connected to each other. Further, since the housing  10   h  is shielded by installing a leakage prevention seal  70  between an inner wall of the housing  10   h  and the heat sink  10 , the water can be prevented from entering the housing  10   h.    
         [0049]    With the frequency up converter having a compact size and enhanced heat emission characteristics according to an embodiment of the present invention, as shown in  FIGS. 1 and 2 , enough heat emission can be achieved by installing the heat sink  10  on only one side, and water can be prevented from entering between an inside of the heat sink and the housing even when the heat sink is not installed on the top. 
         [0050]    The frequency up converter having a compact size and enhanced heat emission characteristics of the present invention described above has features in which devices are installed on different boards by classifying the devices constituting the frequency up converter according to their heat generation rate, a board on which the relatively low heat generating device is installed is not influenced by the heat generated in the high heat generating device due to protection by a cover, and the heat emission efficiency is increased by effectively emitting the heat generated in the high heat generating device. 
         [0051]    That is, since the heat generated from the high heat generating device or component does not pass through the low heat generating device and is emitted to the outside through the heat transfer medium-the cover-the heat sink, the heat generated from the high heat generating device cannot have an influence on another device, and can be effectively emitted. 
         [0052]    Since the frequency up converter according to the present invention is constituted by stacking the plurality of boards, the frequency up converter can be constituted in a relatively small area compared with the conventional communication device, and thus can achieve miniaturization. 
         [0053]    It will be apparent to those skilled in the art that various modifications can be made to the above-described exemplary embodiments of the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention covers all such modifications provided they come within the scope of the appended claims and their equivalents.