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Патент USA US3054041

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Sept. 11, 1962
R. c. SABiNS
3,054,032
HEAT SINK FOR A.C.-D.C. RECTIFIER
Filed Nov. 17, 1958
INVENTOR.'
ROLLAND C. SABINS
a‘,
ATTORNEYS
United States Patent O??ce
1
3,054,632
' Patented Sept. 11, 1962
2 .
3,054,032
HEAT SINK FOR A.C.-D.C. REQITIFIER
Roliand C. Sabins, 522 flataiina Blvd, San Diego, Calif.
Fiied Nov. 17, 1958, Ser. No. ‘774,328
6 Qlaims. (Cl. 317-234)
The present invention relates to, a heat sink and more
particularly to a heat sink for an electric element or de
mum peak inverse volts 200; maximmn R.M.S. volts
140; and in current rating of ‘amperes these diodes in a
full wave bridge (4 required) are rated to deliver 200
amperes D.C. maximum current at 125 volts D.C. pro
viding the temperature does not exceed 100 degrees centi
grade.
Six of these diodes are shown and may all be
carried by one heat sink, but for various bridge relation
ship purposes, I provide three sinks, each a half wave
bridge, 52, 54 and 56 which are superimposed, each carry
ing two diodes, an equal number on the opposite side of
the cabinet 22, providing a triple full Wave bridge as
such as an A.C.-D.C. recti?er employing a diode and a
sembly. The base 58 of each diode is provided with a
lgeat sink in intimate heat exchange relationship with the
?at surface 60 which is in intimate heat exchange rela
iode.
tionship with the flat surface 62 on a sink and these bases
In practicing the present invention, I employ, as a heat
are held in intimate heat exchange relationship with the
sink, a block of high thermal conductive material, such
sinks by three screws 64 for each base. A stranded wire
as high thermal aluminum. The base of the diode is
66 is connected to the diode 5t) opposite the base 58 and
secured to the block in intimate heat exchange relation
is provided with a fastening terminal 68.
ship. I provide a large number of holes extending
The sinks or blocks 52, 54 and 56 are formed of a high
through the block so as to materially increase the heat
exchange area between the block and the environment, for 20 thermal heat conductive material such as high thermal
aluminum for the ready dissipation of heat from the di
example the air thereabout. Preferably these holes are
ode 50 to the heat sink. A series of holes are drilled
arranged in a circle whose axis is approximately at the
through the heat sinks and the panel 46. In the instant
center of that area of the diode that engages the block.
embodiment fourteen holes 70 are arranged in a circle,
Further objects and advantages will be apparent from
vice such as a diode.
The present invention relates to an electrical assembly
the following description, reference being had to the ac 25 the axis of the circle coinciding with the axis of the di
ode; in this manner heat is dissipated equally radially
companying drawings wherein a preferred embodiment of
from the diodes. The blowers force air about the diodes
the invention is illustrated.
and through the openings 76 to the exterior of the cabi~
In the drawings:
FIG. 1 is a front View of an A.C.-D.C. recti?er in
net.
The large volume or mass of the block of high
cluding the cabinet, the front panel being removed to 30 thermal heat conducting material quickly absorbs the in
tense heat at the base of the diode and the surfaces of
more clearly show interior mechanism therein;
the block quickly dissipate the heat; I prefer to use di~
FIG. 2 is a side view of the cabinet;
odes having a delivery value in amperes of twice that
of the demand. For example, the diodes, as above rated,
sinks being mounted upon an insulating panel, the struc 35 are for a demand of only approximately 100 amperes
DC. at a maximum voltage of 125 volts DC. In such in
ture of FIG. 3 being on a larger scale than in FIGS. 1
FIG. 3 is a plan view of an assembly including three
superimposed sinks each carrying two diodes, the three
stallation, I employ a high thermal aluminum block
and 2;
12 x 42/3 x 2 inches for two diodes and with fourteen
FIG. 4 is a fragmentary view on twice the scale of the
holes of one-half inch in diameter for surrounding each
upper left corner of FIG. 3; and
‘FIG. 5 is a sectional view taken on line 5-—5 of FIG. 40 diode. Thus the surface composite area of the walls
‘ forming the twenty-eight holes should be approximately
4, the elements being shown on a larger scale.
?fty percentum of the area of the total surface area of a
Referring more in detail to the drawings, the A.C.
two diode block. This one to two ratio of holes’ surface
D.C. recti?er is shown generally at 20 and includes a
areas and the surface block area prevails for all sizes of
cabinet 22 preferably formed of sheet metal. The front
diodes. For example a sink for a two diode block, in
wall 23 of the cabinet is provided with an opening 24
' which the demands on the diodes are twice that of the
which is normally closed by a removable panel 26. The
example heretofore set out, namely demands of 200
front of the cabinet also carries electrical meters 28 and
amperes, then the composite surface area of the walls
30. The rear wall of the cabinet is shown at 32 and the
side walls, which are the same, are shown at 34 and 36. 50 forming the holes should be twice that of the example
heretofore set out, and likewise the total surface area of
The front wall 23 of the cabinet carries two blowers 38
the block should be twice that of the example heretofore
and 40 which are driven by a motor 42. These blowers
set out.
may be of the sirocco type having inlets one of which
To further enhance the heat exchange from the diodes
is shown at 44.
The upper portions of the side walls 34- and 36 are cut 55 to the sinks and the environment air, I surround the di
odes 50 with a ring 72. This ring is formed of high
away and each of these cut away portions is closed by
thermal
heat conductive material such as high thermal
a panel 46. This panel is formed of dielectric material
and preferably ?ber glass.
It will be understood that
aluminum. It is spaced concentrically of the diode, and
the space is ?lled with a high heat conductive material
74 of the dielectric type. This material 74 may be of
each of these walls 34 and 36 carries a panel 46. FIG. 3
is a View of one of these panels looking in the direction 60 the epoxy type containing granules or threads of high
of arrow 3 of FIG. 1. The same may be said with re
spect to FIG. 4, and it will be seen from FIG. 4 that the
heat conducting material. This ring 72 is secured in
intimate heat exchange relationship with the sink by
panels are provided with holes 48 for attaching the same
screws 76. The material 74 and ring 72 not only pro
to the cabinet by screws or bolts passing through the
vide for the ready heat exchange from the diode to the
65 environment air and the heat sink, but also enhance the
holes 48.
Diodes 50 are provided preferably of the silicon type,
physical sturdiness of the diode. It will be observed that
the sink extends outwardly sufficiently to provide coverage
and in the instant embodiment these diodes are of the
for at least a part of the stranded wire 66 by the heat
ZOVM type recti?ers manufactured by Sarkes Tarzian,
Inc., Recti?er Division, 415 North College Avenue,
conducting material 74.
By reason of the present invention su?icient heat is
that company’s catalog No. 669Al (revised June 1957).
conducted from the diodes 50‘ so as to prevent injury to
the same even when such diodes are subjected to surge
Bloomington, Indiana, and are illustrated on page 28 of 70
More speci?cally these diodes are rated as follows: Maxi
3,054,032
£3
4
currents. The material 74, the ring 72 and the surface
62 of the heat sink block readily conducts heat from the
high thermal conductive material such as high thermal
diode 5t}, and this heat is quickly dissipated through the
and disposed in a circle immediately about the diode for
circulation of a cooling medium, the thickness of the
block and the number and the diameter of the holes
rear and front faces of the sink, the ends of the sink,
and the surfaces of the holes 70 as the air passes through
the holes 70. Also considerable heat is dissipated di
rectly from the material 74 and the ring 72 to the air
passing over those elements.
aluminum, said wall having holes extending therethrough
are so proportioned that the composite radiating area
surface of the walls forming the holes is approximately
?fty percentum of the external radiating surface of the
By reason of the present invention, I have materially
block.
reduced the size and weight over recti?ers heretofore 10
3. An A.C.FD.C. recti?er assembly comprising in com
used; in many instances such reduction was approxi
mately ?fty percent.
It will be understood that the connections 68 are suit
bination, a diode having a base and a conductor extend
ing from the diode; a wall, said base of the conductor
being supported by the wall in intimate heat conducting
ably connected either directly to a source of AC. current
relationship, said wall comprising a block of high thermal
or through a transformer 78 while one bank of sinks on 15 conductive material such as high thermal aluminum, said
one side of the cabinet provides a positive outlet for the
recti?ed current and the other bank of sinks provides a
negative outlet for the recti?ed current. The conductor
for one of the outlets of the DC current is shown at
wall having holes extending therethrough for circulation
of a cooling medium; a casing spaced from and surround
ing the diode, said casing being formed of high thermal
conductive material such as high thermal aluminum; and
80 at FIG. 3. This conductor is insulated by a sheath 20 a heat conducting material embedded in the casing and
82. The conductor St} is suitably connected to each of
surrounding the diode.
the sinks 52, 54- and 56 by connectors 84.
4. An assembly as de?ned in claim 3 characterized in
While I have shown blowers for circulating air through
that the composite area of the walls forming the holes in
the cabinet and about and through the heat sinks, it
approximately ?fty percentum of the external surface of
will be understood that such blowers are merely for illus 25 the block.
trative purposes and that, in certain insulations, sufficient
5. An A.C.-D.C. recti?er assembly comprising in com
air is circulated by convection. Too, in certain instances
bination, a diode having a base and a conductor extend
it may be more desirable to space the sinks from one
ing from the diode, said base having a ?at outer surface
another. Thus air can also pass between the sinks.
and a wall for supporting the diode, said wall having a
While the form of embodiment herein shown and de 30 ?at surface in intimate contact with the ?at surface of
scribed constitutes a preferred form, it is to be under
the base of the diode, said wall comprising a block of
stood that other forms may be adopted falling within the
high thermal conductive material such as high thermal
scope of the claims that follow.
aluminum, said wall having holes extending therethrough
I claim:
for circulation of a cooling medium; a casing spaced
1. An A.C.-D.C. recti?er assembly comprising in com 35 from and surrounding the diode, said casing being formed
bination, a diode; and a cabinet including a wall for sup
of high thermal conductive material such as high thermal
porting the diode within the cabinet, said Wall being in
aluminum; and a heat conducting material embedded in
intimate contact with the diode and comprising a block
the casing and surrounding the diode.
of high thermal conductive material such as high thermal
6. An assembly as de?ned in claim 5 characterized in
aluminum, said wall having holes extending therethrough 40 that the composite area of the walls forming the holes is
and disposed in a circle immediately about the diodes
approximately ?fty percentum of the external surface of
for circulation of a cooling medium, the thickness of the
the block.
block and the number and the diameter of the holes are
so proportioned that the composite radiating area surface
References Cited in the ?le of this patent
of the walls forming the holes is approximately ?fty per 45
UNITED STATES PATENTS
centum of the external radiating surface of the block.
1,975,658
Marshall ____________ __ Oct. 2, 1934
2. An A.C.—D.C. recti?er assembly comprising in com
2,353,461
Hamann ____________ __ July 11, 1944
bination, a diode, said diode including a base having a
2,471,011
Shapiro _____________ __ May 24, 1949
flat outer surface; and a cabinet including a wall for sup
Harty ______________ __ Jan. 10, 1956
porting the diode within the cabinet, said Wall having a 50 2,730,663
?at surface in intimate contact with the ?at surface of
2,876,399
Koenig ______________ __ Mar. 3, 1959
the base of the diode, said wall comprising a block of
2,917,686
Boyer ______________ __ Dec. 15, 1959
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