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Sept- 24, 1946-
H. D. GARRETSON
_
2,403,017
ELECTRICAL CIRCUIT ARRANGEMENT
Filed May 5. 1943
HARRY D. GARRETSON
INVENTOR.
$1M
ATTORNEK.
i’ I
Patented Sept. 24, 1946
2,408,017
UNITED STATES PATENT OFFICE
2,403,017
ELECTRICAL CIRCUIT ARRANGEMENT
Harry Douglas Garretson, Whitestone, N. Y., as
signor to Philips Metalix Corporation, New
York, N. Y.
Application May 5, 1943, Serial No. 485,769
5 Claims. (01. 171-119)
1
My invention relates to electrical circuit ar
rangements and particularly to circuit arrange
2
Fig. 2 illustrates the circuit arrangement of the
invention as applied to an adjustable voltage
transformer in which the input and output wind
ings are electrically insulated from each other.
Referring to the drawing, the transformer of
over bared turns of a transformer winding. The
Fig. 1 comprises a rectangular magnetic core It
invention is especially applicable to adjustable
on two legs H and I2 of which are two windings
voltage auto-transformers having a step-down
l3 and M respectively, connected in series addi
ratio and will be described in this connection.
tive relationship to input terminals !5 and [6. A
Transformers of the above speci?c type usually 10 continuously adjustable voltage is obtained at
comprise an electrical winding having a ?xed
‘output terminals 13 and I9 from the winding [4
voltage portion and an adjustable voltage por»
by means of a slider I‘! which contacts bared
tion. In practice, the two portions of the wind
portions of the winding I4. The voltage appear
ing are spatially separated in order to provide
ing at terminals 18 and 19 has a Value deter
proper access of the adjusting slider and its op
mined by the position of the slider I’! relative to
erating mechanism to the adjustable-voltage per»
the interconnection between windings l3 and M
tion of the winding. In the case of transformers
to which the terminal 19 is connected.
comprising a rectangular magnetic core, the fixed
As above pointed out, the leakage rectance
voltage and the adjustable portions of the trans
normally existing between windings l3 and [4
ments for adjustable voltage transformers have
ing a variable output voltage continuously ad
justable by a sliding member adapted to move
former Winding are each Wound on a separate leg
of the magnetic core.
While this construction simpli?es the mechan~
ical design of the transformer, I have found that
it introduces certain electrical disadvantages,
more particularly, this construction produces a
transformer having a high leakage reactance and
characterized by poor voltage regulation.
It is an object of the invention to obviate the
above electrical disadvantages.
causes the transformer to exhibit poor voltage
regulation. In accordance with the invention,
the leakage reactance of the transformer is ef
fectively reduced by means of a tertiary widing
20 which is connected in shunt with the Winding
I4. Winding 20 is 50 coupled to winding l3 that
substantially all of the magnetic lines induced
in the transformer leg H by the winding [3 are
linked with the winding 20, Such a close cou
pling is obtained by superimposing the winding
A more speci?c object of the invention is to 30 20 over the Winding I3.
provide novel circuit arrangements for trans
The number of turns of the winding 20 is so
formers of the above described type by which the
determined that under no-load conditions the
effective leakage reactance of the transformer is
voltage induced in the winding is equal to the
reduced without sacri?cing the mechanical ad
voltage appearing across the winding M.
vantages of the transformer construction.
In usual practice, the transformer of Fig. 1
A further object of the invention is to provide
has a step-down ratio of 2 to 1, i. e. the maximum
simple and economical expedients for improv
voltage obtainable across the terminals l8 and I9
ing the voltage regulation of adjustable volt
is equal to one-half the voltage applied to ter
age transformers.
minals l5 and I6. In such a case, the windings
These and further objects of the invention will 4.0 l3 and H! are symmetrical and to obtain the im
appear as the speci?cation progresses.
provement in regulation in accordance with the
In accordance with the invention, I effectively
invention a Winding 20 is used having the same
reduce the high leakage reactance between the
number of turns as the windings I3 and [4.
?xed-voltage and the adjustable voltage portions
The transformer illustrated in Fig. 2 com
of the windings by means of a tertiary Winding 45 prises a rectangular magnetic core 30 having a
which is closely coupled to the ?xed-voltage por
winding 3| positioned about a leg 32 of the core
tion and which is electrically connected in
and connected to input terminals 35 and 36. P0
shunt with the adjustable-voltage portion.
sitioned about a leg 34 of the core is an output
The invention will be described in greater de
winding 33 one end of which is connected to out
tail with reference to the appended drawing in 50 put terminals 31. The output voltage of the
which
transformer is adjustable by means of an ad
Figure 1 illustrates the circuit arrangement of
justable slider 39 adapted to contact bared por
the invention as applied to an adjustable volt
tions of the winding 33 and connected to a ter
age auto-transformer having a step-down ratio
minal 38. Windings 3| and 33 are electrically in
between the input and output terminals,
55 sulated and their turns ratio may be step-up or
2,408,017
‘a
step-down as desired depending on the require
ments to be met by the transformer.
In accordance with the invention, the leak
age reactance existing between the windings 3|
said core, a second winding on another portion
of said core, and so positioned with respect to
said first winding that a substantial amount of
leakage reactance exists between the windings,
a slider member adapted to contact bared por
and 33 is elfectively reduced by means of a ter
tions of said second winding, and means to re
tiary winding dill which is connected in shunt with
duce the effective leakage reactance between
the winding
Winding Mi is superimposed on
said windings, said means comprising a tertiary
the winding 3! and so coupled to it that substan
winding on said core tightly coupled magnetically
tially all of the magnetic lines of force induced
in leg 32 are linked with the winding 43. The 10 to said first winding and connected in shunt with
said second winding.
number of turns‘ of winding 40 is so determined
4. An adjustable voltage transformer compris
that the voltage induced in this winding is the
same as the voltage induced in winding 33.
ing a rectangular magnetic core, a winding on
It should be well understood that while the
invention has been described in connection with
transformers having a continuously adjustable
said core having a portion positioned about one
leg of the core and a second portion positioned
voltage output, the invention is equally applic
able to transformers in which the output voltage
is adjustable by means of a plurality of taps of
the output winding.
While I have described my invention by means
of speci?c examples and in speci?c embodiments,
I do not wish to be limited thereto for obvious
modifications will occur to those skilled in the
art without departing from the spirit and scope
of the invention.
What I claim is:
1. An electrical transformer comprising a mag
netic core, two magnetically coupled windings
on said core and so positioned with respect to
each other that a substantial amount of leakage
reactance mists between. the windings, and a ter~
tiary ‘wins.
on said core tightly coupled mag
netically to one of said two windings and con
nected in shunt with the other of said two wind
ings.
2. An electrical transformer comprising a mag
netic core, a winding on a portion of said core,
a second winding on another portion of said core,
and a tertiary winding on said core superim l. i)
posed on said ?rst winding and connected in
shunt with said second winding.
3. An adjustable voltage transformer compris
ing a magnetic core, a winding on a portion of
about another leg of said core and interconnected
in series relationship with said first portion, a
slider member adapted to contact bared portions
of said second winding for providing an adjust
able voltage proportional to the part of said sec
ond winding portion between the slider contact
and the interconnection between the winding
portions, and a winding on said core superim
posed on said ?rst winding portion, connected
in shunt with said second winding portion and
having an induced voltage equal to the induced
voltage of said second winding portion.
5. An adjustable voltage transformer compris
ing a rectangular magnetic core, a winding on a
leg of said core, a second winding positioned on
a second leg of said core, electrically insulated
from said ?rst winding and so positioned with
respect thereto that a substantial amount of leak—
age reactance exists between the windings, a ter
tiary winding on said core superimposed on said
?rst winding and connected in shunt with ‘said
second winding, said third winding having an
induced voltage equal to the induced voltage of
said second winding, and means for contacting
selected portions of said second winding for pro‘
viding an adjustable voltage proportional to the
portion of the winding interposed between said
means and the end of the winding
HARRY DOUGLAS GARRETSON.
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