1. Field of the Invention
The present invention relates to power adapters for electronic devices.
2. Description of the Related Art
There exists today may different portable electronic devices that are powered by rechargeable batteries. Examples of such portable electronic devices include mobile phones, portable media players, personal digital assistants (PDAs), etc. To facilitate recharging of the rechargeable batteries, a portable electronic device is normally sold with a power adapter. Typically, the power adapter has a power plug for coupling to an AC outlet. The power plug is a significant part of a power adapter that is required to meet certain specifications for safety reasons. The power adapter also contains electronic circuitry that converts AC power acquired from the AC outlet into DC power and outputs DC power via a cord having a connector. The connector of the cord connects to the portable electronic device and allows the DC power to be received at the portable electronic device so as to power the portable electronic device and/or charge the rechargeable battery. There is, however, an ongoing demand for small and thinner power adapters. Accordingly, there is a need to provide improved power adapters are efficient in their construction and operation.
The invention relates to low-profile power adapters. In one embodiment, a low profile power adapter is facilitated by improved approaches to construct and assembly of a power adapter plug for the power adapter. According to one aspect, a base for a power adapter plug of a power adapter can include a metal base connected to a blade (or prong) of the power adapter plug. The metal base can provide mechanical support to the blade as well as electrical connectivity to an internal terminal for the power adapter plug. According to another aspect, internal terminals used by a power adapter plug of a power adapter can be flexibly positioned on the power adapter plug, thereby facilitating interconnection with electrical components used by the power adapter.
The invention may be implemented in numerous ways, including, but not limited to, as a system, device, or apparatus, or method. Example embodiments of the present invention are discussed below.
As a power adapter, one embodiment of the invention can, for example, include at least: a first metal prong having a front end and a back end; a first metal base mechanically and electrically connected to the back end of the first prong, the first metal base including or coupling to at least a first terminal; a second metal prong having a front end and a back end; a second metal base mechanically and electrically connected to the back end of the second prong, the second metal base including or coupling to at least a second terminal; and a molded base formed around the first and second metal bases such that the first and second metal prongs are at least partially exposed and the first and second metal bases are not exposed except for the first and second terminals which are at least partially exposed, the molded base being non-conductive.
As a method for assembling a power adapter, one embodiment of the invention can, for example, include at least: obtaining a first metal prong for the power adapter, the first metal prong having a front end and a back end, with the back end having at least one attachment feature; obtaining a first metal base having at least one opening to receive the at least one attachment feature of the first metal prong; securing the first metal prong proximate to the at least one opening of the first metal base using the at least one attachment feature, thereby providing a mechanical and electrical connection between the first metal prong and the first metal base; and forming a non-conductive base around the first metal base to encapsulate the first metal base while the first metal prong remains at least substantially exposed.
As a power adapter plug, one embodiment of the invention can, for example, include at least: a first metal prong having a front end and a back end; a first metal base mechanically and electrically connected to the back end of the first prong, the first metal base including or coupling to at least a first terminal; a second metal prong having a front end and a back end; a second metal base mechanically and electrically connected to the back end of the second prong, the second metal base including or coupling to at least a second terminal; and a non-conductive base formed around the first and second metal bases such that the first and second metal prongs and the first and second terminals are at least partially exposed.
Various aspects and advantages of the invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention.
The invention will be readily understood by the following detailed description in conjunction with the accompanying drawings, in which:
The invention relates to low-profile power adapters. In one embodiment, a low profile power adapter is facilitated by improved approaches to construct and assembly of a power adapter plug for the power adapter. According to one aspect, a base for a power adapter plug of a power adapter can include a metal base connected to a blade (or prong) of the power adapter plug. The metal base can provide mechanical support to the blade as well as electrical connectivity to an internal terminal for the power adapter plug. According to another aspect, internal terminals used by a power adapter plug of a power adapter can be flexibly positioned on the power adapter plug, thereby facilitating interconnection with electrical components used by the power adapter.
Exemplary embodiments of the present invention are discussed below with reference to the various figures. However, those skilled in the art will readily appreciate that the detailed description given herein with respect to these figures is for explanatory purposes, as the invention extends beyond these embodiments.
The terminals 108 and 110 can be placed at any location on the second side of the base 102. In other words, in the terminals 108 and 110 do not have to be positioned directly behind the corresponding blades 104 and 106 as would be the case with conventional approaches. Instead, the terminals 108 and 110 can be offset from the positions of the blades 104 and 106, such that the terminals 108 and 110 can be positioned anywhere on the second side of the base 102. By controlling the position of the terminals 108 and 110, assembly of the power adapter 102 with other electrical components, such as a printed circuit board, can be performed in a space efficient manner. For example, the power adapter plug 100 can be directly attached to a printed circuit board since the position of the terminals 108 and 110 can be designed so as to correspond to connection terminals of the printed circuit board.
In one embodiment, advantageously, the thickness t of the base 102 is thin. The thickness t of the base 102 is, for example, less than about 0.5-3.0 millimeters. In one specific example the thickness t of the base 102 can be about 2.5 millimeters. As a result, the power adapter plug 100 can be considered a low-profile power adapter.
The electronic device assembly 200 includes a power adapter plug 202. The power adapter plug 202 can, for example, be constructed similar to the power adapter plug 100 illustrated in
In one embodiment, the power adapter plug 202 is a low-profile adapter plug which is able to couple directly to the printed circuit board 212 without intervening mechanical assistance by other components. As a result, the overall thickness of an electronic device (e.g., power adapter) being formed to enclose the electronic device assembly 200 can be smaller and thinner. As shown in
Once the power adapter plug 202 is electrically (and possibly mechanically) connected to the printed circuit board 212, the power adapter assembly 200 can be enclosed within an external device housing (not shown), thereby forming a power adapter product. In operation, the power adapter assembly 200 can serve to convert AC power into DC power, and then supply the DC power to electrical components of an electronic device which can be electrically connected to the power adapter assembly 200 directly (e.g., integral with electronic device) or indirectly (e.g., by connector and/or wire (cord). For example, the blades 204 and 206 of the power adapter assembly 200 can be inserted into an AC electrical outlet from which high-voltage alternating current can be acquired. The electrical components 214 associated with the printed circuit board 212 can operate to convert the high-voltage Alternating Current (AC) into a low-voltage Direct Current (DC) which is suitable for use for powering electrical components of the electronic device.
Although the power adapter assembly 200 illustrated in
The electronic device assembly process 300 can initially form 302 a low-profile power adapter plug with positionable terminals. As an example, the low-profile power adapter plug can correspond to the power adapter plug 100 illustrated in
As noted above terminals on a base of a power adapter can be positioned (or repositioned) to a more desirable location. In other words, the terminals can be positioned anywhere on a base of the power adapter. There are various embodiments for positioning the terminals. In one embodiment, a terminal can result from a portion of a metal base that is provided internal the base of the power adapter plug. In another embodiment, one or more connection members can link a metal base to a terminal location.
The first base plate 408 is coupled to a rear end of the blade 404. The first base plate 408 serves as a structural base for the blade 404. In one implementation, the first base plate 408 is mechanically connected to the blade 404. The mechanical connection can, for example, be provided by (i) interlocking the blade 404 with the first base plate 408, (ii) soldering the parts together, and/or (iii) using some attachment members (such as screws, fasteners or rivets). In addition to providing mechanical connection, once the first base plate 408 is connected to the blade 404, the blade 404 and the first base plate 408 are also electrically connected.
Similarly, the second base plate 410 is coupled to a rear end of the blade 406. The second base plate 410 serves as a structural base for the blade 406. In one implementation, the second base plate 410 is mechanically connected to the blade 406. The mechanical connection can, for example, be provided by (i) interlocking the blade 406 with the second base plate 410, (ii) soldering the parts together, and/or (iii) using some attachment members (such as screws, fasteners or rivets). In addition to providing mechanical connection, once the second base plate 410 is connected to the blade 406, the blade 406 and the second base plate 410 are also electrically connected.
The first base plate 408 and the second base plate 410 can also respectively serve to support a first terminal 412 and a second terminal 414. The terminals 412 and 414 are at least partially exposed and thus accessible on the back side of the base 402. The terminals 412 and 414 serve as internal connection points for the power adapter plug 400. Hence, the terminals 412 and 414 can also be referred to as internal terminals. The utilization of the base plates 408 and 410 operates to facilitate the placement of the terminals 412 and 414 anywhere along the back side of the base 402. Consequently, the interconnection of the power adapter plug 400 with respect to other electrical circuitry or components is greatly facilitated.
The first base plate 458 is coupled to a rear end of the blade 454. The first base plate 458 serves as a structural base for the blade 454. In one implementation, the first base plate 458 is mechanically connected to the blade 454. The mechanical connection can, for example, be provided by (i) interlocking the blade 454 with the first base plate 458, (ii) soldering the parts together, and/or (iii) using some attachment members (such as screws, fasteners or rivets). In addition to providing mechanical connection, once the first base plate 458 is connected to the blade 454, the blade 454 and the first base plate 458 are also electrically connected. In addition, the base 452 can further include a first connection member 462 that provides a path within the base 452 from the first base plate 458 to a first terminal 464. The first terminal 464 is electrically connected to the first base plate 458 via the first connection member 462. The first terminal 464 is at least partially exposed and thus accessible on the back side of the base 452. The first connection member 462 can be integrally formed with the first base plate 458. Alternatively, the first connection member 462 can be separately formed and subsequently connected to the first base plate 458. The first connection member 462 thus permits the first terminal 464 to be positioned (and oriented) in any position along the back side of the base 452.
Similarly, the second base plate 460 is coupled to a rear end of the blade 456. The second base plate 460 serves as a structural base for the blade 456. In one implementation, the second base plate 460 is mechanically connected to the blade 456. The mechanical connection can, for example, be provided by (i) interlocking the blade 456 with the second base plate 460, (ii) soldering the parts together, and/or (iii) using some attachment members (such as screws, fasteners or rivets). In addition to providing mechanical connection, once the second base plate 460 is connected to the blade 456, the blade 456 and the second base plate 460 are also electrically connected. In addition, the base 452 can further include a second connection member 466 that provides a path within the base 452 from the second base plate 460 to a second terminal 468. The second terminal 468 is electrically connected to the second base plate 460 via the second connection member 466. The second terminal 468 is at least partially exposed and thus accessible on the back side of the base 452. The second connection member 466 can be integrally formed with the second base plate 460. Alternatively, the second connection member 466 can be separately formed and subsequently connected to the second base plate 460. The second connection member 466 thus permits the second terminal 468 to be positioned (and oriented) in any position along the back side of the base 452.
The terminals 464 and 468 serve as internal connection points for the power adapter plug 450. Hence, the terminals 464 and 468 can also be referred to as internal terminals. The utilization of the base plates 458 and 460 together with the respective connection members 462 and 466 facilitates the placement of the terminals 464 and 468 anywhere along the back side of the base 452. Consequently, the interconnection of the power adapter plug 450 with respect to other electrical circuitry or components is greatly facilitated.
The first base plate 478 is coupled to a rear end of the prong 474. The first base plate 478 serves as a structural base for the prong 474. In one implementation, the first base plate 478 is mechanically connected to the prong 474. The mechanical connection can, for example, be provided by (i) interlocking the prong 474 with the first base plate 458, (ii) soldering the parts together, and/or (iii) using some attachment members (such as screws, fasteners or rivets). In addition to providing mechanical connection, once the first base plate 478 is connected to the prong 474, the prong 474 and the first base plate 478 are also electrically connected. In addition, the base 472 can further include a first connection member 482 that provides a path within the base 472 from the first base plate 478 to a first connector 484 (e.g., pin or post type connector), which serves as a first terminal. The first connector 484 is electrically connected to the first base plate 478 via the first connection member 482. The first connector 484 is at least partially exposed and thus accessible on the back side of the base 472. The first connection member 482 can be integrally formed with the first base plate 478. Alternatively, the first connection member 482 can be separately formed and subsequently connected to the first base plate 478. The first connection member 482 thus permits the first connector 484 to be positioned (and oriented) in any position along the back side of the base 472.
Similarly, the second base plate 480 is coupled to a rear end of the prong 476. The second base plate 480 serves as a structural base for the prong 476. In one implementation, the second base plate 460 is mechanically connected to the prong 476. The mechanical connection can, for example, be provided by (i) interlocking the prong 476 with the second base plate 480, (ii) soldering the parts together, and/or (iii) using some attachment members (such as screws, fasteners or rivets). In addition to providing mechanical connection, once the second base plate 480 is connected to the prong 476, the prong 476 and the second base plate 480 are also electrically connected. In addition, the base 472 can further include a second connection member 486 that provides a path within the base 472 from the second base plate 480 to a second connector 488 (e.g., pin or post type connector), which serves as a second terminal. The second connector 488 is electrically connected to the second base plate 480 via the second connection member 486. The second connector 488 is at least partially exposed and thus accessible on the back side of the base 472. The second connection member 486 can be integrally formed with the second base plate 480. Alternatively, the second connection member 486 can be separately formed and subsequently connected to the second base plate 480. The second connection member 486 thus permits the second terminal 488 to be positioned (and oriented) in any position along the back side of the base 472.
The connectors 484 and 488 serve as internal connection points for the power adapter plug 470. Hence, the connectors 484 and 488 can also be referred to as internal terminals. The utilization of the base plates 478 and 480 together with the respective connection members 482 and 486 facilitates the placement of the terminals 484 and 488 anywhere along the back side of the base 472. Consequently, the interconnection of the power adapter 470 with respect to other electrical circuitry or components is greatly facilitated.
The blades (or probes) and base plates utilized in accordance with the invention can take may different sizes and configurations. The blades can also attach to the base plates in various different ways.
The blades (or prongs) used with the power adapter plug are metal. For example, the blades can be stainless steel or cooper. The formation of the blades can done using an extruding or stamping techniques. Stamping tends to leave shear marks which can be undesirable. Hence, it may be preferred to extrude the blades since the surface quality of the edges of the blades can clean, smooth and without shear marks. In one embodiment, the blades can be formed by extruding a metal bar having a width as desired for the height of the blades. Then, individual blades can be separated (or singulated) from the metal bar using a stamping process. Since the stamping of the metal bar does not stamp the sides of the blades (since the width is accurately set by the extruded bar), the surface quality of the sides of the blades is excellent. The exposed end (i.e., exposed tip) of the blades can usually thereafter be smoothed or rounded by a polishing or grinding step so that insertion into an AC outlet facilitated.
In one implementation, the non-conductive base is formed 610 using an injection molding process. The utilization of the metal bases to mechanically support and electrically connect with the metal prongs allows the thickness of the non-conductive base to be relatively thin. In other words, the non-conductive base can be formed with a minimized thickness which facilitates smaller and more compact power adapter designs.
In any case, following the block 706 or the block 708, the power adapter assembly process 700 can mechanically and electrically connect 710 the first metal base to the first metal prong. Similarly, the second metal base can be mechanically and electrically connected 712 to the second metal prong. Thereafter, a non-conductive base can be formed at 714 around the first and second metal bases. The non-conductive base that is formed 714 has the terminals at least partially exposed on the surface of the non-conductive base.
Additionally, after constructing the power adapter plug in accordance with the power adapter assembly process 600 illustrated in
The various aspects, embodiments, implementations or features of the invention can be used separately or in any combination.
The advantages of the invention are numerous. Different embodiments or implementations may, but need not, yield one or more of the following advantages. One advantage of certain embodiments of the invention is that power adapters, or power adapter plugs, can be formed with low profiles which facilitates smaller and thinner power adapters. Another advantage of certain embodiments of the invention is that in forming a power adapter plug base plates can provide structural support for blades. Still another advantage of certain embodiments of the invention is that blades for power adapters, or power adapter plugs, can be fabricated without undesired shear marks along the length of the blades.
The many features and advantages of the present invention are apparent from the written description. Further, since numerous modifications and changes will readily occur to those skilled in the art, the invention should not be limited to the exact construction and operation as illustrated and described. Hence, all suitable modifications and equivalents may be resorted to as falling within the scope of the invention.
This application is a continuation application of U.S. patent application Ser. No. 12/135,044, filed Jun. 6, 2008, entitled “LOW-PROFILE POWER ADAPTER”, which is hereby incorporated herein by reference.
Number | Date | Country | |
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Parent | 12135044 | Jun 2008 | US |
Child | 13195749 | US |