Abstract:
A board-mounted circuit breaker assembly for an electronic equipment enclosure includes a printed circuit board having a plurality of quick-connect terminals and a circuit breaker. The circuit breaker includes a housing and a plurality of quick-connect terminals that are at least partially recessed into a portion of the housing to reduce the overall “z”-height of the circuit breaker. The quick-connect terminals on the circuit breaker are adapted to mechanically and electrically connect to the quick-connect terminals on the printed circuit board.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present application is a U.S. non-provisional patent application of, and claims priority under 35 U.S.C. §119(e) to, U.S. provisional patent application Ser. No. 61/591,342, filed Jan. 27, 2012, which &#39;342 application is incorporated by reference herein in its entirety. Additionally, the entirety of each of the following co-pending, commonly-assigned U.S. patent applications, and any application publication thereof, is expressly incorporated herein by reference:
       (a) U.S. provisional patent application Ser. No. 61/591,369, filed Jan. 27, 2012, and entitled, “POWER DISTRIBUTION UNIT WITH INTERCHANGEABLE RECEPTACLE TYPES;”   (b) U.S. provisional patent application Ser. No. 61/591,379, filed Jan. 27, 2012, and entitled, “CABLE RETENTION SYSTEM FOR POWER DISTRIBUTION UNIT;”   (c) U.S. non-provisional patent application Ser. No. 13/751,118, filed Jan. 27, 2013, and entitled, “POWER DISTRIBUTION UNIT WITH INTERCHANGEABLE OUTLET ADAPTER TYPES;” and   (d) U.S. non-provisional patent application Ser. No. 13/751,119, filed Jan. 27, 2013, and entitled, “CABLE RETENTION SYSTEM FOR POWER DISTRIBUTION UNIT.”       
 
     
    
     COPYRIGHT STATEMENT 
       [0006]    All of the material in this patent document is subject to copyright protection under the copyright laws of the United States and other countries. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in official governmental records but, otherwise, all other copyright rights whatsoever are reserved. 
       BACKGROUND OF THE PRESENT INVENTION 
       [0007]    1. Field of the Present Invention 
         [0008]    The present invention relates generally to circuit breakers in electronic equipment enclosures, and, in particular, to board-mounted circuit breakers for power distribution units in electronic equipment enclosures. 
         [0009]    2. Background 
         [0010]    Cabinets, including rack frame cabinets and other electronic equipment enclosures, are commonly used for storing equipment, often electrical equipment such as computer and telecommunications equipment with multiple components. It naturally follows that the multi-component electrical equipment being stored in cabinets requires multiple sources of power, and that power distribution units may be provided to facilitate this. As used herein, a “power distribution unit” shall be understood to mean a unitary or semi-unitary structure containing multiple power receptacles or outlets. In typical power distribution units (PDUs), the multiple receptacles or outlets are arranged in one or more rows or columns. 
         [0011]    Many power distribution units include, or are used in conjunction with, one or more circuit breakers. Circuit breakers are typically breakers connected with wires and screw terminals. Unfortunately, installing such circuit breakers is time-consuming and tedious. In addition, this approach requires many connections per line and further requires reparative connections for each terminal. 
         [0012]    Furthermore, the overall “z” height of known circuit breakers (i.e., the height of the circuit breakers above, or extending from, the surface of the printed circuit board or other structure on which they are mounted) is prohibitive. Overall “z” height and length in PDU products are a primary constraint in network cabinets. “Z” height restricts access to the rear of computer equipment, blocks air flow and affects required cabinet width. Furthermore, the length of a PDU can affect minimum cabinet height supported and will not work on a majority of applications if it exceeds 42 RMU (1.75″×42=73.5″), including necessary cord bend radius space. 
         [0013]    Thus, a need exists for a circuit breaker design that reduces assembly time, reduces “z” height and/or length, and reduces component count. 
       SUMMARY OF THE PRESENT INVENTION 
       [0014]    The present invention comprises a board-mounted circuit breaker assembly for power distribution units in electronic equipment enclosures. 
         [0015]    Broadly defined, the present invention according to one aspect is a board-mounted circuit breaker assembly for an electronic equipment enclosure, as shown and described. 
         [0016]    Broadly defined, the present invention according to another aspect is a method of installing circuit breakers on a board for an electronic equipment enclosure, as shown and described. 
         [0017]    Broadly defined, the present invention according to another aspect is a power distribution unit, for an electronic equipment enclosure, having a board-mounted circuit breaker assembly as shown and described. 
         [0018]    Broadly defined, the present invention according to another aspect is a board-mounted circuit breaker assembly for an electronic equipment enclosure, including: a printed circuit board having a plurality of quick-connect terminals; and a circuit breaker having a housing and a plurality of quick-connect terminals, adapted to electrically connect to the quick-connect terminals on the printed circuit board, that are recessed into a portion of the housing to reduce the overall “z”-height of the circuit breaker. 
         [0019]    In a feature of this aspect, the quick-connect terminals recessed into the housing of the circuit breaker are male quick-connect terminals. 
         [0020]    In another feature of this aspect, the circuit breaker includes a plurality of circuit breakers. In a further feature, a bracket is disposed between adjacent circuit breakers and is positioned a distance from the printed circuit board by spacers. 
         [0021]    In another feature of this aspect, the board-mounted circuit breaker assembly further includes a cover. In further features, the cover is positioned a distance from the printed circuit board by spacers; and/or the cover is fastened directly to the circuit breaker. 
         [0022]    Broadly defined, the present invention according to another aspect is a method of installing circuit breakers on a board for an electronic equipment enclosure, including: providing a circuit breaker, having a housing and a plurality of quick-connect terminals; and installing the circuit breaker into a printed circuit board, having a plurality of quick-connect terminals, such that the act of coupling the quick-connect terminals of the circuit breaker to the quick-connect terminals of the printed circuit board both mounts the circuit breaker on the printed circuit board and electrically connects the circuit breaker inline to the printed circuit board. 
         [0023]    Broadly defined, the present invention according to another aspect is a circuit breaker-equipped electronic equipment enclosure, including: an electronic equipment enclosure; electronic equipment mounted within the electronic equipment enclosure; and a board-mounted circuit breaker assembly, mounted within the electronic equipment enclosure and utilized in relation to the electronic equipment. The board-mounted circuit breaker assembly includes a printed circuit board, having a plurality of quick-connect terminals disposed on a mounting surface thereof, and a plurality of circuit breakers, each having a housing and a plurality of quick-connect terminals, wherein the quick-connect terminals are adapted to mechanically and electrically connect to the quick-connect terminals on the printed circuit board, and are each at least partially recessed into a portion of the housing to reduce the overall height of the circuit breaker above the mounting surface. 
         [0024]    Broadly defined, the present invention according to another aspect is a board-mounted circuit breaker assembly for an electronic equipment enclosure, including: a printed circuit board having a plurality of quick-connect terminals disposed on a mounting surface thereof; and a circuit breaker having a housing, and a plurality of quick-connect terminals, adapted to mechanically and electrically connect to the quick-connect terminals on the printed circuit board, that are each at least partially recessed into a portion of the housing to reduce the overall height of the circuit breaker above the mounting surface. 
         [0025]    In features of this aspect, the quick-connect terminals recessed into the housing of the circuit breaker are male quick-connect terminals; the quick-connect terminals on the printed circuit board are female quick-connect terminals; each of the quick-connect terminals of the circuit breaker is entirely recessed into a portion of the housing such that no portion of the quick-connect terminals extend past the rearmost, printed circuit board-facing surface of the housing; the plurality of quick-connect terminals of the circuit breaker includes four quick-connect terminals; and/or the four quick-connect terminals of the circuit breaker are arranged at ends of the housing. 
         [0026]    In further features of this aspect, the circuit breaker includes a plurality of circuit breakers. In a further feature, a bracket is disposed between adjacent circuit breakers and is positioned a distance from the printed circuit board by at least one spacer. In still further features, the board-mounted circuit breaker assembly further includes a cover that extends over the plurality of circuit breakers; the cover is positioned a distance from the printed circuit board by spacers; the cover is fastened to the at least one spacer by a first fastener and the at least one spacer is fastened to the printed circuit board by a second fastener; and/or the cover is fastened directly to the circuit breakers. 
         [0027]    Broadly defined, the present invention according to another aspect a method of installing circuit breakers on a printed circuit board for an electronic equipment enclosure, including: providing at least one circuit breaker having a housing and a plurality of quick-connect terminals; and installing the at least one circuit breaker onto a printed circuit board, having a plurality of quick-connect terminals disposed on a mounting surface thereof, such that the act of coupling the quick-connect terminals of the at least one circuit breaker to the quick-connect terminals of the printed circuit board both mechanically mounts the at least one circuit breaker on the printed circuit board and electrically connects the at least one circuit breaker inline to the printed circuit board. 
         [0028]    In a feature of this aspect, the method further includes fastening a cover directly to the at least one circuit breaker with mechanical fasteners. In a further feature, the method further includes positioning the cover a distance from the printed circuit board with spacers, fastening the cover to the spacers, and fastening the spacers to the printed circuit board. 
         [0029]    In a another feature of this aspect, the quick-connect terminals of the at least one circuit breaker are male quick-connect terminals. 
         [0030]    In another feature of this aspect, the quick-connect terminals on the printed circuit board are female quick-connect terminals. 
         [0031]    In another feature of this aspect, the quick-connect terminals of the at least one circuit breaker are each at least partially recessed into a portion of the housing to reduce the overall height of the circuit breaker above the mounting surface. In a further feature, each of the quick-connect terminals of the at least one circuit breaker is entirely recessed into a portion of the housing such that no portion of the quick-connect terminals extend past the rearmost, printed circuit board-facing surface of the housing. 
         [0032]    Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0033]    Further features, embodiments, and advantages of the present invention will become apparent from the following detailed description with reference to the drawings, wherein: 
           [0034]      FIG. 1  is a partially schematic front isometric view of an electronic equipment enclosure having a board-mounted circuit breaker assembly mounted therein in accordance with one or more preferred embodiments of the present invention; 
           [0035]      FIG. 2  is a front isometric view of the board-mounted circuit breaker assembly of  FIG. 1  in accordance with one or more preferred embodiments of the present invention; 
           [0036]      FIG. 3  is an exploded isometric view of the board-mounted circuit breaker assembly of  FIG. 2 ; 
           [0037]      FIG. 4  is a rear isometric view of one of the circuit breakers of  FIG. 2 ; 
           [0038]      FIG. 5  is a side view of the circuit breaker of  FIG. 4 ; and 
           [0039]      FIG. 6  is a side cross-sectional view of the board-mounted circuit breaker assembly of  FIG. 2 , taken along line  6 - 6 . 
       
    
    
     DETAILED DESCRIPTION 
       [0040]    As a preliminary matter, it will readily be understood by one having ordinary skill in the relevant art (“Ordinary Artisan”) that the present invention has broad utility and application. Furthermore, any embodiment discussed and identified as being “preferred” is considered to be part of a best mode contemplated for carrying out the present invention. Other embodiments also may be discussed for additional illustrative purposes in providing a full and enabling disclosure of the present invention. As should be understood, any embodiment may incorporate only one or a plurality of the above-disclosed aspects of the invention and may further incorporate only one or a plurality of the above-disclosed features. Moreover, many embodiments, such as adaptations, variations, modifications, and equivalent arrangements, will be implicitly disclosed by the embodiments described herein and fall within the scope of the present invention. 
         [0041]    Accordingly, while the present invention is described herein in detail in relation to one or more embodiments, it is to be understood that this disclosure is illustrative and exemplary of the present invention, and is made merely for the purposes of providing a full and enabling disclosure of the present invention. The detailed disclosure herein of one or more embodiments is not intended, nor is to be construed, to limit the scope of patent protection afforded the present invention, which scope is to be defined by the claims and the equivalents thereof. It is not intended that the scope of patent protection afforded the present invention be defined by reading into any claim a limitation found herein that does not explicitly appear in the claim itself. 
         [0042]    Thus, for example, any sequence(s) and/or temporal order of steps of various processes or methods that are described herein are illustrative and not restrictive. Accordingly, it should be understood that, although steps of various processes or methods may be shown and described as being in a sequence or temporal order, the steps of any such processes or methods are not limited to being carried out in any particular sequence or order, absent an indication otherwise. Indeed, the steps in such processes or methods generally may be carried out in various different sequences and orders while still falling within the scope of the present invention. Accordingly, it is intended that the scope of patent protection afforded the present invention is to be defined by the appended claims rather than the description set forth herein. 
         [0043]    Additionally, it is important to note that each term used herein refers to that which the Ordinary Artisan would understand such term to mean based on the contextual use of such term herein. To the extent that the meaning of a term used herein—as understood by the Ordinary Artisan based on the contextual use of such term—differs in any way from any particular dictionary definition of such term, it is intended that the meaning of the term as understood by the Ordinary Artisan should prevail. 
         [0044]    Regarding applicability of 35 U.S.C. §112, ¶6, no claim element is intended to be read in accordance with this statutory provision unless the explicit phrase “means for” or “step for” is actually used in such claim element, whereupon this statutory provision is intended to apply in the interpretation of such claim element. 
         [0045]    Furthermore, it is important to note that, as used herein, “a” and “an” each generally denotes “at least one,” but does not exclude a plurality unless the contextual use dictates otherwise. Thus, reference to “a picnic basket having an apple” describes “a picnic basket having at least one apple” as well as “a picnic basket having apples.” In contrast, reference to “a picnic basket having a single apple” describes “a picnic basket having only one apple.” 
         [0046]    When used herein to join a list of items, “or” denotes “at least one of the items,” but does not exclude a plurality of items of the list. Thus, reference to “a picnic basket having cheese or crackers” describes “a picnic basket having cheese without crackers,” “a picnic basket having crackers without cheese,” and “a picnic basket having both cheese and crackers.” Finally, when used herein to join a list of items, “and” denotes “all of the items of the list.” Thus, reference to “a picnic basket having cheese and crackers” describes “a picnic basket having cheese, wherein the picnic basket further has crackers,” as well as describes “a picnic basket having crackers, wherein the picnic basket further has cheese.” 
         [0047]    Referring now to the drawings, in which like numerals represent like components throughout the several views, one or more preferred embodiments of the present invention are next described. The following description of one or more preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. 
         [0048]      FIG. 1  is a partially schematic front isometric view of an electronic equipment enclosure  90  having a board-mounted circuit breaker assembly  10  mounted therein in accordance with one or more preferred embodiments of the present invention. The board-mounted circuit breaker assembly  10  may be part of a electrical supply system that also includes such devices as power distribution units  92 , 94 . The electrical supply system has a general purpose of providing power to electronic equipment, such as servers  96 , that is installed in the enclosure  90 . 
         [0049]      FIG. 2  is a front isometric view of the board-mounted circuit breaker assembly  10  of  FIG. 1  in accordance with one or more preferred embodiments of the present invention. As shown therein, the circuit-breaker assembly  10  includes a board assembly  20 , a plurality of circuit breakers  30 , and a cover  12 , which may include an identification  16 , such as labels, graphics, a display, or the like, for each circuit breaker  30 . Among other elements, the board assembly  20  includes a printed circuit board (PCB)  22  and a plurality of female electrical terminals  24  extending from a mounting surface  23  thereof. Each circuit beaker  30  is mounted directly to the PCB  22  via a respective set of female terminals  24 . The board-mounted circuit breaker assembly  10  may be utilized in or with any suitable power distribution unit in an electronic equipment enclosure  90 , including, for example, the power distribution units  92 , 94  shown in  FIG. 1 . Such power distribution units  92 , 94  are described in co-pending, commonly-assigned U.S. non-provisional patent application Ser. Nos. 13/751,118 and 13/751,119, each of which is incorporated by reference herein in its entirety. 
         [0050]      FIG. 3  is an exploded isometric view of the board-mounted circuit breaker assembly  10  of  FIG. 2 . With reference to  FIGS. 2 and 3 , three circuit breakers  30  are mountable to the board assembly  20  via male electrical terminals  26  located on the rear or underside of each circuit breaker  30 . In particular, each circuit breaker  30  includes four male terminals  26  that may be inserted into a corresponding set of female terminals  24  disposed on the PCB  22 . The circuit breakers  30  are further held in place by the cover  12 , which is attached to the front or top of the circuit breakers  30  via fasteners  14 . As will be further described below, the cover  12  is also attached to the board assembly  20  via butterfly brackets  38 , spacers  34 , and various fasteners  18 , 28 , 36 . 
         [0051]      FIG. 4  is a rear isometric view of one of the circuit breakers  30  of  FIG. 2 , and  FIG. 5  is a side view of the circuit breaker  30  of  FIG. 4 . With reference to  FIGS. 2-4 , each circuit breaker  30  includes a housing  40 , which includes various surfaces, particularly including a rear surface  42  and a front surface  44 . A control interface  32  for the circuit breaker is disposed on the front surface  44  of the housing  40 , and corresponding openings are provided in the cover  12  to accommodate such interfaces  32 . As perhaps best shown in  FIG. 4 , the four male electrical terminals  26  are arranged at ends of the housing  40  and are oriented to point directly toward the female terminals  24  that extend from the PCB  22 . Notably, each male terminal  26  is recessed within a hollow  46  and sized to accommodate a respective female terminal  24  when connected thereto. In this arrangement, the end of each terminal  26  is entirely recessed behind the rear surface  42  of the housing  40 , and thus the housing  40  as a whole takes up a minimum of space in front of or above the PCB  22 . 
         [0052]    It will be appreciated that, although one type of male terminal and corresponding female terminal are illustrated, other types of male and female terminals may likewise be utilized in at least some embodiments, as long as the terminals on the circuit breaker are recessed into a portion of the housing. Furthermore, the locations of the male and female terminals may be reversed such that the female terminals are on the circuit breaker and the male terminals are on the PCB. Still further, in some embodiments, the terminals may be disposed at the front of the circuit breaker instead of at the rear. 
         [0053]    Further assembly details are provided in  FIG. 6 , which is a side cross-sectional view of the board-mounted circuit breaker assembly of  FIG. 2 , taken along line  6 - 6 . With particular reference to  FIGS. 2 ,  3  and  6 , the butterfly brackets  38  are positioned at a defined distance away from the PCB  22  by spacers  34 . A first fastener  36  is used to attach each butterfly bracket  38  to a respective spacer  34 , and a second fastener  28  is used to attach the spacer  34  to the PCB  22 . Similarly, ends of the cover  12  are positioned at a defined distance away from the PCB  22  by spacers  34 . A first fastener  36  is used to attach each end of the cover  12  to a respective spacer  34 , and a second fastener  28  is used to attach the spacer  34  to the PCB  22 . Furthermore, as described previously, the cover  12  is also attached to the front surfaces  44  of the breakers  30  via fasteners  14 . In at least some embodiments, as the butterfly brackets  38  are installed and the fasteners  36  are tightened, the butterfly brackets  38  may engage surfaces of the circuit breakers  30 . 
         [0054]    In at least some embodiments, the spacers  34  are electrically nonconductive, and thus help to electrically isolate the cover  12  from the printed circuit board  22 . This may be achieved by fastening the cover  12  to the spacers  34  using first fasteners  36  and fastening the spacers  34  to the printed circuit board  22  using second fasteners  28 . The spacers  34  may be internally threaded at each end to facilitate such arrangement. 
         [0055]    In various embodiments, the circuit breakers may have wire connections or other board mounted terminals; the circuit breakers may have a screw terminal with a through hole on the board that contacts a contact pad; all connections may be made in by one or more assembly directions; or connections may be staged to allow incremental engagement for ease of assembly. 
         [0056]    Advantageously, the design described and illustrated herein creates an abbreviated interface (i.e., the male terminals  26  on the circuit breakers  30  are coupled to the female terminals  24  of the PCB  20 , and no other connections are made) between the circuit breakers  30  and the printed circuit board  22 . This, in turn, eliminates wires, reduces assembly time and minimizes the “z” height (i.e., the height of the circuit breakers above, or extending from, the surface of the PCB  22 ) of the final product. 
         [0057]    Furthermore, the arrangement allows the connection of multiple line connections by having fixed terminal locations that obtain electrical continuity upon part assembly. In other words, the step of connecting electrical connections is combined with the step of mechanical part assembly. 
         [0058]    Still further, direct connection of the board allows easy integration of board mount measurement devices in the system, and allows easy integration of board mount monitoring, control and graphics devices in the system. 
         [0059]    Based on the foregoing information, it will be readily understood by those persons skilled in the art that the present invention is susceptible of broad utility and application. Many embodiments and adaptations of the present invention other than those specifically described herein, as well as many variations, modifications, and equivalent arrangements, will be apparent from or reasonably suggested by the present invention and the foregoing descriptions thereof, without departing from the substance or scope of the present invention. 
         [0060]    Accordingly, while the present invention has been described herein in detail in relation to one or more preferred embodiments, it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for the purpose of providing a full and enabling disclosure of the invention. The foregoing disclosure is not intended to be construed to limit the present invention or otherwise exclude any such other embodiments, adaptations, variations, modifications or equivalent arrangements; the present invention being limited only by the claims appended hereto and the equivalents thereof.