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Патент USA US3037170

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United States Patent 0 "
.
3,037,159
Patented May 29, 1962
1
2
3,037,159
13 having diode elements 14 and 15 together with gate
windings 16 and 17 which are wound, respectively, upon
gapless magnetic cores 18 and 19. Control winding 20
REGULATED POWER SUPPLY SYSTEM
Harold J. Brown, 6947 College Ave., Indianapolis, Ind.
Filed June 4, 1959, Ser. No. 818,232’
3 Claims. (Cl. 321-18)
(Granted under Title 35, U.S. Code (1952), sec. 266)
is wound on both cores 1‘8 and I19‘.
Bias winding 21 is
provided and is energized from the A.C. voltage source
through recti?er elements 22 to 25, inclusive, and bias
resistance element 26. The output of the controller
9 is connected to the primary winding 27 of transformer
The invention described herein may be manufactured
10‘. Recti?ers 31 to 34, inclusive, are connected to the
and used by or for the Government of the United States
of America for governmental purposes without the pay 10 secondary winding 35 of transformer 10‘. The secondary
winding 35 is center-tapped and a voltage reference bridge
ment of any royalties thereon or therefor.
12 has one terminal connected to the center-tap of sec
The present invention relates to a regulated power sup
ondary winding 35. An integrating ?lter reactor 36, hav
ply system and more particularly to a power supply sys
ing equal windings 37 and 38 in opposite legs, is con
tem that will provide a constant direct current voltage
15 nected to the output of recti?ers 31 to 34, inclusive. A
output.
control bridge winding 39 is provided and has one end
Many commercial and military devices require the use
connected to one output terminal, and a control circuit
of reliable voltage regulated power sources. capable of
?lter inductor 40 is connected in series between control
producing a constant DC. output voltage under varying
conditions of line supply voltage, frequency and environ
mental conditions. Various systems have been devised
in the past to provide ‘a regulated source of D.C. voltage.
Many of these systems employ vacuum tubes or thyratron
bridge winding 39 and the voltage reference bridge 12.
The number of turns of control bridge winding 39 is
equal to the number of turns of winding 37.
Referring still to FIG. 2 of the drawing, it can be seen
preampli?ers and consequently, cannot be subjected to
that the voltage reference bridge 12 is comprised of volt
very strenuous shocks or vibrations. Also, when a short
age reference elements 41 and 42 and resistors 43 and
controller, the output of which is fed to a transformer
and then recti?ed. A reference voltage source comprised
of zener diodes is provided and when the reference volt
voltage reference elements 41 and 42 are chosen such
as to add up to oneihalf the desired output voltage.
Controller 9 is capable of maximum holdback when
time-constant system is desired, heretofore available sys 25 44. By way of example, the voltage reference elements
41 and 42 may be zener diodes. The resistors 43 and
tems become grotesque and unwieldly with characteris
44, and voltage reference elements 41 and 42, are con
tically low ef?ciency even at high loads.
nected in bridge relation, ‘as shown in the drawing. Con
The present invention provides a novel system for sup
trol winding 20 in controller 9 is energized by the volt
plying regulated DC voltage and the apparatus is small
‘age reference bridge 12 through the control circuit ?lter
and compact and provides fast response. An input of
inductor 40 and the control bridge winding 39. The
alternating current is applied to a magnetic ampli?er
age is larger than the recti?ed voltage output the current 35 a negative current flows through control winding 20, A
in the reference voltage source bypasses the zener diodes
positive control current ?owing through winding 20
and the magnetic ampli?er controller has minimum hold
back. On the other hand, when the reference voltage
output is less than the recti?ed voltage output, the cur
will cause a minimum holdback. Bias resistance ele
ment 26 is so chosen that the change in holdback occurs
at zero control current, or when the voltage reference
ampli?er controller has maximum holdback. The recti
?ed voltage output is supplied to a ?lter choke having
?rst and second equal windings. A third winding in
the ?lter choke is provided and this winding is connected
In operation, an ‘alternating current voltage is applied
to the input of the controller 9. By way of example,
and not of limitation, this A.C. voltage may be of the
‘ rent will ?ow through the zener diodes and the magnetic 40 bridge 12 is in balance.
order of 115 volts and may vary between 95 and 150
volts. The controller 9 reduces this voltage to approxi
mately 85 volts [average and applies it to the primary
winding 27 of transformer 10. Transformer 10 steps up
this voltage to 160‘ volts A.C. average value, and this
It is, therefore, a general object of the present inven
tion to provide an improved system for controlling the 50 stepped-up voltage is supplied to the recti?er unit 11
which in turn provides a direct current voltage having
recti?ed voltage to a load.
an average value of 160 volts. It is this direct current
Another object of the present invention is to provide
voltage that is to be maintained at a constant value even
a voltage regulating system having a very fast response
though the input voltage may be varying by as much ‘as
time.
Other objects and many of the attendant advantages 55 30 percent.
The center-tap connection 45‘ from transformer 10
of the present invention will be readily appreciated as the
provides ‘a direct current output of one-half the recti?ed
same becomes better understood by reference to the fol
output, or 80 volts, which is supplied to the voltage ref
lowing detailed description When considered in connec
erence bridge 12. When this 80 volts output exceeds by
tion with the accompanying drawing wherein:
a small increment the sum of the voltage reference ele
FIG. 1 is a block diagram illustrating the principal
ments 41 and 42, which in this example would be chosen
components. of the present invention; and
to equal 80 volts, a large negative current will flow in
FIG. 2 is a schematic view embodying the present
the control winding 20 by virtue of the low resistance
invention.
of the control path, and the magnetic ampli?er 13 will
Refer-ring now to FIG. 1 of the drawing, it can be seen
that recti?ed current is supplied to a ?lter element 8 65 provide maximum holdback. The current ?ow would
be from center-tap 45 through voltage reference ele
from an alternating current supply source through a cir
ment 41, through control winding 20‘, then through volt
cuit comprising a controller 9, a transformer 10‘, and a
»age reference element 42 and control circuit ?lter in
recti?er unit 11. The transformer 10* is center-tapped
ductor 40.
and a voltage reference bridge 12 is connected to the
center-tap of transformer 10 and to the ?lter element 70 When the output ‘from the center-tap 45 of transformer
10‘ is slightly under the sum of the voltage reference ele
8. Referring now to FIG. 2 of the drawing, it can be
ments, at positive current will ?ow through control wind~
seen that the controller 9 includes a magnetic ampli?er
in series with a second choke. This second choke has
‘an inductance just su?icient to maintain current flow in
the zener diodes in the reference voltage source.
3,037,159
3
ing 20‘ and the magnetic ampli?er v13 will provide a mini
mum holdback.
The current flow will be from center
tap 45 of transformer 10 through resistor 44, then through
control winding 20‘, resistor 43 and control circuit ?lter
inductor 40, in that order.
Heretofore, control circuits that have been connected
to the output of a regulated direct current power supply
would oscillate at the natural frequency of the ?lter sys
,
tem. In the present invention, the introduction of the
control bridge winding 39 eliminates the dynamical reac 10
tion of the ?lter system and yet the direct current volt
age is transferred to the voltage reference bridge 12. In
order to maintain conduction in the voltage reference
bridge over the entire alternating current cycle, the con
4
current to said control winding, a control bridge winding
equal in turns to the number of turns of said ?rst wind
ing connected between said ‘?rst output terminal and
said voltage reference means for stabilizing said voltage
regulator, and a control circuit ?lter connected in series
between said control bridge winding and said voltage ref
erence means for maintaining conduction in said volt
age reference means during the entire cycle of said alter
nating current.
2. A voltage regulator as set forth in claim 1 wherein
said voltage reference means includes ?rst and second
zener diodes and ?rst and second resistors connected in
bridge relation.
3. A voltage regulator for supplying a constant direct
It can thus 15 current voltage output comprising: a source of alternat
be seen that by deliberately reintroducing the alternating
ing current, a magnetic ampli?er connected to said source
current component of the output voltage, and resup
of alternating current and having a control winding
trol circuit ?lter inductor 40 is provided.
pressing it in a separate element, that absolute stability
is achieved. Thus ampli?ers, derivative circuits, and the
wound on at least one gapless core for assisting and re
tarding the ?ux of said core, a power transformer con
like, are not necessary in order to obtain a very high 20 nected in circuit with said magnetic amplifier and having
degree of accuracy and stability.
a center-tap connection on the secondary winding there
A regulated power supply system has been built at
the US. Naval Avionics Facility according to the princi
ples of the present invention and this system has proven
of, ?rst and second output terminals, rectifying means
connected to the secondary winding of said transformer
for providing a direct current voltage output to said
to be an extremely reliable one with a marked degree 25 terminals, a ?lter having a ?rst winding connected be
of stability. It has been shown that the system is capable
tween said rectifying means and said ?rst output termi
of holding the direct current output so that it will not
nal and a second winding equal in turns to said ?rst
vary more than one-one hundredth (1/100) of a per
winding and connected between said rectifying means
cent, even though the alternating current may be varying
and said output terminal, voltage reference means hav
30 ing one input connected to said ?rst output terminal
by as much as thirty (30) percent.
Obviously many modi?cations and variations of the
and another input connected to said center-tap con
present invention are possible in the light of the above
nection, the output of said voltage reference means being
teachings. Particularly it should be understood that the
connected to said control winding of said magnetic am
foregoing disclosure relates to only a preferred embodi
pli?er for selectively assisting and retarding the ?ux of
ment and that where values are set forth that these were
said core, a control bridge winding equal in turns to the
intended for purposes of illustration and not of limita
number of turns of said ?rst winding connected between
tion.
said ?rst output terminal and said voltage reference means
What is claimed is:
for stabilizing said voltage regulator, and a control cir
1. A voltage regulator for supplying a constant direct
cuit ?lter connected in series between said control bridge
current voltage output comprising: a source of alternat 40 winding and said voltage reference means for maintain
ing current, a controller connected to said source of alter
ing conduction in said voltage reference means during
nating current and having a control winding for provid
the entire cycle of said alternating current.
7
ing a variable holdback, ?rst and second output terminals,
References
Cited
in
the
?le
of
this
patent
rectifying means connected to the output of said con
UNITED STATES PATENTS
troller for providing a direct current voltage output to 45
said terminals, 21 ?lter having a ?rst winding connected
2,653,293
Huge ______________ __ Sept. 22, 1953
between said rectifying means and said ?rst output termi
2,723,372
Eagan et a1. __________ __ Nov. 8, 1955
nal and a ‘second winding equal in turns to said ?rst
2,858,499‘
Silver ______________ __ Oct. 28, 1958
winding and connected between said rectifying means
2,875,395;
Blash?eld ___________ __ Feb. 24, 1959
and said second output terminal, voltage reference means 50 2,914,720‘
Merkel ______________ __ Nov. 24, 1959
connected between said ?rst output terminal and said
2,945,172
Bixby _______________ __ Julyg12, 1960
controller for selectively passing positive and negative
2,994,027
Bennett et a1. ________ __ July 25, 1961
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