Apparatus for and method of cooling molded electronic circuits

• US 9,204,575 B2
• Filed: 08/30/2012
• Issued: 12/01/2015
• Est. Priority Date: 09/07/2004
• Status: Active Grant

• Current Assignee: Flextronics America LLC (Flextronics International Limited)
• Original Assignee: Flextronics America LLC (Flextronics International Limited)
• Inventors: Sharifipour, Bahman, Jansen, Arian
• Primary Examiner(s): SMITH, COURTNEY L
• Application Number:
  US13/600,115
• Publication Number:
  US 20130016476A1
• Time in Patent Office: 1,188 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H01R 13/6658 on printed circuit board H01R13/6666 - H01R13/6691 take precedence
• CPC Class Codes: H01R 24/28 Coupling parts carrying pins, blades or analogous contacts and secured only to wire or cable
• CPC Class Codes: H05K 7/20463 Filling compound, e.g. potted resin
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

An electronic device such as an AC/DC power adapter includes a conductive heat dissipation system. The device contains heat generating components and is powered via power supply leads by an external power supply circuit. The device further contains a thermally conductive mass that is thermally coupled to both the heat generating components and to the power supply leads. When the power supply leads are coupled to receive electricity from the external power supply circuit, heat generated by the device is thermally conducted into the external power supply circuit via the power supply leads.

Claims

1. A power converter comprising:

a. an AC to DC (AC/DC) power conversion circuit comprising a primary side having heat-generating components and a secondary side, wherein the AC/DC power conversion circuit is configured for converting an electric signal;

b. AC power supply leads comprising a prong end configured to plug into an AC wall socket coupled to an AC power supply network and a thermally conductive end, wherein the AC power supply leads are coupled to the AC/DC power conversion circuit to provide the electric signal to the AC/DC power conversion circuit; and

,

c. an electrically inert, thermally conductive mass thermally coupled with the AC/DC power conversion circuit including the primary side and the secondary side and thermally coupled to the thermally conductive end of the AC power supply leads to transfer heat generated by the AC/DC power conversion circuit to the AC power supply leads, into the AC wall socket, and into the AC power supply network, wherein the electrically inert, thermally conductive mass encases the primary side of the AC/DC power conversion circuit, the secondary side of the AC/DC power conversion circuit and the thermally conductive end of the AC/DC power supply leads, further wherein the prong end of the AC/DC power supply leads protrude from the electrically inert, thermally conductive mass,

wherein the AC power supply leads are coupled to the AC power supply network such that the heat generated by the AC/DC power conversion circuit is transferred to the AC power supply network.

2. The power converter of claim 1, further comprising power output leads coupled with the AC/DC power conversion circuit.

3. The power converter of claim 2, wherein the electrically inert, thermally conductive mass encases at least a portion of the power output leads.

4. The power converter of claim 1, wherein the primary side and the secondary side are separated by a gap of at least 0.4 mm and the electrically inert, thermally conductive mass further comprises the gap.

5. The power converter of claim 4, wherein the electrically inert, thermally conductive mass within the gap provides electrical isolation between the primary side and the secondary side.

6. The power converter of claim 1, wherein the electrically inert, thermally conductive mass is molded over the primary side of the AC/DC power conversion circuit, the secondary side of the AC/DC power conversion circuit and the thermally conductive end of the AC/DC power supply leads.

7. The power converter of claim 1, wherein a material type of the electrically inert, thermally conductive mass and a thickness of encasement comprising the electrically inert, thermally conductive mass are selected such that the external temperature of the electrically inert, thermally conductive mass does not exceed 70°

C. in temperature.

8. The power converter of claim 2, further comprising a power cord coupled to the power output leads, and a DC power coupling coupled to the power cord, that terminates the power cord.