초록 ▼

An electronic device with dual heat dissipating structures use in an electronic system is disclosed. The electronic device comprises the circuit board having the first and second heat producing surfaces, the major and auxiliary heat dissipating structures disposed on the first and second heat produc

An electronic device with dual heat dissipating structures use in an electronic system is disclosed. The electronic device comprises the circuit board having the first and second heat producing surfaces, the major and auxiliary heat dissipating structures disposed on the first and second heat producing surfaces of the circuit board respectively, and the connective portion connecting the auxiliary heat dissipating structure and the major heat dissipating structure. The second heat producing surface of the circuit board is a high-temperatured area relative to the first heat producing surface of the circuit board in the electronic system, thereby the heat produced by the second heat producing surface of the circuit board can be conducted to the major heat dissipating structure through the auxiliary heat dissipating structure and the connective portion for heat dissipation.

대표청구항 ▼

What is claimed is: 1. An electronic device with dual heat dissipating structures, comprising: a circuit board having a first heat producing surface and a second heat producing surface with a plurality of protrusions disposed on said first and said second heat producing surfaces respectively; a maj

What is claimed is: 1. An electronic device with dual heat dissipating structures, comprising: a circuit board having a first heat producing surface and a second heat producing surface with a plurality of protrusions disposed on said first and said second heat producing surfaces respectively; a major heat dissipating structure disposed on said first heat producing surface of said circuit board; an auxiliary heat dissipating structure disposed on said second heat producing surface of said circuit board; and a connective portion connecting said auxiliary heat dissipating structure and said major heat dissipating structure; wherein said second heat producing surface of said circuit board is a high-temperatured area relative to said first heat producing surface of said circuit board in an electronic system so as to conduct heat produced by said second heat producing surface of said circuit board to said major heat dissipating structure through said auxiliary heat dissipating structure and said connective portion for heat dissipation. 2. The electronic device with dual heat dissipating structures according to claim 1 wherein said electronic device is a power converter. 3. The electronic device with dual heat dissipating structures according to claim 1 wherein said circuit board is a double-layer circuit board or a multi-layer circuit board. 4. The electronic device with dual heat dissipating structures according to claim 1 wherein said major heat dissipating structure is a heat sink. 5. The electronic device with dual heat dissipating structures according to claim 1 wherein said auxiliary heat dissipating structure is a plate made of a high thermal-conductive material. 6. The electronic device with dual heat dissipating structures according to claim 5 wherein said high thermal-conductive material is metal. 7. The electronic device with dual heat dissipating structures according to claim 1 wherein said major heat dissipating structure and said auxiliary heat dissipating structure further comprise a plurality of via holes corresponding to said protrusions respectively for said protrusions to pass therethrough. 8. The electronic device with dual heat dissipating structures according to claim 1 wherein said electronic device is fixed on a system circuit board of said electronic system by connecting said protrusions on said second heat producing surface of said circuit board to said system circuit board thereby forming said high-temperatured area between said second heat producing surface of said circuit board and said system circuit board of said electronic system. 9. The electronic device with dual heat dissipating structures according to claim 1 wherein said electronic device further comprises a thermal conducting media disposed between said major heat dissipating structure and said first heat producing surface of said circuit board and/or between said auxiliary heat dissipating structure and said second heat producing surface of said circuit board for conducting heat evenly. 10. The electronic device with dual heat dissipating structures according to claim 1 wherein said major heat dissipating structure is fixed on said first heat producing surface of said circuit board through a fixing element. 11. The electronic device with dual heat dissipating structures according to claim 1 wherein said connective portion is disposed on opposite sides of said auxiliary heat dissipating structure and integrally formed therewith. 12. The electronic device with dual heat dissipating structures according to claim 11 wherein said connective portion is fixed on said major heat dissipating structure through a fixing element. 13. An electronic system comprising: a system circuit board; and an electronic device with dual heat dissipating structures disposed on said system circuit board, said electronic device comprising: a circuit board having a first heat producing surface and a second heat producing surface with a plurality of protrusions disposed on said first and said second heat producing surfaces respectively; a major heat dissipating structure disposed on said first heat producing surface of said circuit board; an auxiliary heat dissipating structure disposed on said second heat producing surface of said circuit board and substantially near said system circuit board; and a connective portion extended from opposite sides of said auxiliary heat dissipating structure and connected to said major heat dissipating structure; wherein heat produced by said second heat producing surface is conducted to said major heat dissipating structure through said auxiliary heat dissipating structure and said connective portion so as to dissipate heat. 14. The electronic system according to claim 13 wherein said electronic device is a power converter. 15. The electronic system according to claim 13 wherein said major heat dissipating structure is a heat sink. 16. The electronic system according to claim 13 wherein said auxiliary heat dissipating structure is a plate made of high thermal-conductive material. 17. The electronic system according to claim 13 wherein said major heat dissipating structure and said auxiliary heat dissipating structure further comprise a plurality of via holes corresponding to said protrusions respectively for said protrusions to pass therethrough. 18. The electronic system according to claim 13 wherein said electronic device is fixed on said electronic system by connecting said protrusions on said second heat producing surface of said circuit board to said system circuit board thereby forming a high-temperatured between said second heat producing surface of said circuit board and said system circuit board.