close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Nov. 6, 1962
3,063,004
R. VIC
DEVICE FOR TESTING THE RESIDUAL POWER CAPACITY O
F A BATTERY
SUPPLYING A GLOW DISCHARGE TUB E OR THE LIKE
Filed May 26, 1959
13
5
2
1a
{13
lg
16'
l5
A_ _ ,_ b=_ _
"12
United States Paté?t
1
1
ce
.
‘
3,003,004
Patented Nov‘. 6, 19621
2
. The invention will be better understood‘from'the ensu
-
.
'
‘
3,063,004
.
1'
'
.
DEVICE FOR TESTING THE RESIDUAL POWER
CAPACITY OF A BATTERY SUPPLYING A GLOW
DISCHARGE TUBE OR THE LIKE
_
.
Raymond Vic, La Celle St. Cloud,v France, assignor to.
The Compagnie Industrieile des Piles Electriques Cipel,
Neuilly-sur-Seine, France, a company of France
Filed May 26,1959, _Ser. No. 816,002'
2 Claims. _ (Cl. 324-—-29.5)
'
ing description which is illustrative but is not restrictive."
‘FIG;
In- the 1drawings:‘
is a wiring diagram of an installation
. '
, ' equipped
I.
with
ilFIG.
atesting
2‘ illustrates
device'embodying
part of the
theinstallation
invention; of". FIG.
'
_1
showing the condition of the circuitry during'normal op_
eration thereby; and
' '
‘
‘
_'
,
FIG. 3 is a view similar to that of FIG. 2 showing the
'10 same part of the circuit, ‘but illustrating the conditions
This invention relates to glow discharge tube installa~
during a testing operatic .
'
_
The installation shown in FIG. 1 comprises‘ a battery 1
tions utilizing a ‘battery type generator as the power source
supplying a glow discharge tube 9 ‘by way of a supply
supplying energy _to one or more glow tubes by wayv of
circuit comprising a transistor oscillator 2 and a trans—
suitable oscillator and transformer means. Such installa 15 former 4. The secondary 8 of the transformer is con
tions have important uses, e.g. in rail-way signalling equip
nected across the glow tube 9. The primary of the trans
ment, but have been subject to the following drawback.
former isin two parts 3 and 3', each having one end con~
In contrast to the more conventional resistance lamp,.a
nected to a battery terminal'line 11 or 13. The upper
glow lamp or'tu-be will continue operating satisfactorily
part 3 of the primary has its said one end further'com
even after the voltage supplied to it from‘ the generator has
nected- to the base of- the transistor by way of a resistance
decreased considerably, a large reduction in the available
6__and
its other end connected to another electrode of the
voltage-bringingabout only a very small drop’iinl'ithe
transistor, while the lower part 3' of the- primary has its
brightness of the tube. It is only when the voltage devel
said one end connected to the remaining electrode of the
oped byfthe generator has decreased below a certain
transistor and its other, end connected to .the base byjway
threshold‘ 'value that'th'e'glow' tube i's‘e'x'tinguished. Be 25 of
resistance
"Due to the resistances 5 and 6, their‘an;
cause of this, there is no convenient means of ascertaining
in installations of the type described, when to change the
supply "battery in order to avert a sudden and unexpected
extinction of the glow lamp or lamps. This is a very
sistor operates as a blocking oscillator. A condenser 7
across the ‘supply lines 11 and 13 serves to smooth out the
output of the oscillator. The battery 1 may comprise a
set of cells sold by the applicants as Type AD 535.
serious drawback e.g. in connection with a railway signal 30
A low resistance 10 vis connected in series in the supply
light.
'
line 11 and has a very low value, say 20 ohms. This re
It is an object of this invention to provide, in such in
sistance is normally short-circuited across its ends A and B
stallations, a means of conveniently checking at any time
by means of a switch '12, when the latter is in the position
whether the power source is still capable of adequate serv
shown in full lines in FIG. 1. The switch 12 is preferably
ice, and of doing so during the operation of the system, 35 in the form of a manually operable push-button switch.
and without disabling the latter.
When the switch 12 is ‘moved to the position 12’ shown
As will be apparent from the ensuing description, the
in dotted lines, the resistance 10 is placed in the supply
invention makes it possible to determine by an extremely
circuit for the part 3' of the transformer primary, and
simple operation such as the actuation of a push-button
simultaneously a connection 14 is established from point
switch, if the residual power capacity of the battery is 40 B to the supply line 13 by way of two series resistances 15
sufficient to ensure proper operation until the next test
and 16. Resistance 16 is a resistance having a negative
(assuming such tests are performed at regular predeter
temperature coef?cient i.e. a thermistor. Its characteris
mined intervals). The glow lamp remains illuminated dur
tics may be such that the resistance is 60 ohms at —20° C.,
ing the test, if he condiionnhetaoinshsdlucmfwyphshrdlu
30 ohms at 0° and 4 ohms ‘at +50°. These values of
ing the test, if the condition of the battery is such as to ~15 course are indicative only.
ensure continued operation of the glow discharge lamp
The resistance 15 may be 5 ohms in value and its func
until the next scheduled test, whereas, the lamp or tube is
tion is to set a limit to the conductivity of the thermistor
temporarily extinguished if the battery is spent to an ex
16 at high temperatures.
tent that it will not ensure proper service until the next
In normal service conditions, with switch 12 in the posi
test and hence requires replacement.
tion shown in full-lines, the circuit connections are estab~
According to the invention, means are provided for
lished as shown in FIG. 2, that is, resistance 10 is shorted
momentarily inserting into the supply circuit for the glow
and the transformer primary is supplied from the battery
lamp or lamps a suitable voltage drop. This voltage drop,
as represented e.g.; by a set of resistances, is so predeter
mined that the remaining operating time of the battery '
after the test remains greater than the time interval sep
arating two successive tests —in cases where the tests are
carried out at predetermined intervals as just stated.
According to another feature of the invention, allow
as if the resistances 10, 15 and 16 were absent. To per
form a test the switch 12 is displaced to its dotted-line
position 12' (as by pressing a button) whereupon the re
sulting circuit connections are as shown in 'FIG. 3. The
transformer primary is then supplied from the battery by
way of a voltage divider comprising the resistances 10, 15
and 16, with the voltage being taken across the resistances
ance is made for the fact that the voltage available across 60 1S and 16.
The three resistances are so predetermined that the
a ‘battery decreases substantially with the surrounding
temperature. Thus, if the ambient temperature is rela
tively low at the time the test is performed, the test may
cause the lamp to be put out thereby indicating the need
voltage drop thus introduced on movement of the switch
to position 12' reduces the voltage available for the lamp
9 across the secondary 8 of the transformer to the critical
to replace the battery, whereas actually the battery may 65 extinguishing level, with the battery cells operating under
4 volts at ordinary temperature. Under these conditions
requisite period of time. Accordingly, the invention con
one will be sure of the correct subsequent operation of the
templates automatically varying the value of the voltage
lamp
for approximately another 50 hours assuming the
drop momentarily introduced into the lamp supply circuit
still be in a condition to furnish su?icient energy for the
tests are carried out at regular 12 hour intervals as is gen—
with temperature, as by providing a resistance having 70 er-ally
the case in connection with railway signal systems.
If the surrounding temperature drops, the voltage put
nected to the battery.
a negative temperature coet?cient or a thermistor con
out by the battery drops correspondingly, but since the
""3,06_3,004
3
-
.
4
so that, with said load de?ning means introduced into the
supply circuit, the glow discharge tube continues to be
illuminated only if the state of charge of the battery is
resistance of thermistor 15 increases, matters can be so
arranged that the voltage drop across the series resistances
15-16, during the test remains approximately constant
and independent of temperature. In practice it has been
found possible to use the system described successfully
such as to ensure continued illumination of the tube by
the battery for a predetermined duration after the test.
2’. A device as in claim 1, wherein said means for in~
over a temperature range of from ——20° C. to 50° C.,
troducing the load‘ de?ning means into the supply circuit
with the voltage developed by the battery varying from
includes switch means having normally closed contacts
and normallyopencontacts, said load de?ning means fur~
includes an additional resistance, the ?rst mentioned
made vwithin'the scope of the invention. For example, the 10 ther
resistance
being connected in parallel with the oscillator
temperature compensating resistance 16 may well be dis
means and transformer means upon closing of said nor
pensed with in case the installation is‘ not to be subjected
mally open contacts and said additional resistance being
to wide temperature variations. The oscillator system
about 2.4 volts at -—20° C. to 4.4 volts at 50“.
It will be evident that various modi?cations may be
used has been shown as a transistor, ‘but may assume any
other desired form, including that of thermionic tubes,
' connected in series with the oscillator means and trans
15 former means upon closing of the normally open con
tacts, and said normally closed contacts forming a short
circuit around said additional resistance.
References Cited in the ?le of this patent
mechanical vibrators or the like. The means for intro
ducing the voltage drop may likewise differ from the
resistance network shown.
‘
What I claim is:
' UNITED STATES PATENTS
1. A device for periodically testing the state of charge 20
of a battery which is regularly employed for energizing
at least one glow discharge tube by way of a supply circuit
including oscillator means and transformer means; said
device comprising additional load de?ning means includ
ing a resistance having a negative temperature coe?icient,
and means for introducing said load de?ning means into
the supply circuit during testing of the state of charge of
the battery, said load de?ning means being dimensioned
896,300
2,887,592
*
25.
,
207,578
391,690
438,407
924,329
Jarvis ________________ __ Aug. 18, 1908
Stout et al _____________ __ May 19, 1959
FOREIGN PATENTS
Great Britain ; ________ -_ Nov. 30,
Germany _____________ __ Mar. 14,
Great Britain _________ __ Nov. 15,
France _______________ __ Mar. 3,
1923v
1924
1935
1947
Документ
Категория
Без категории
Просмотров
0
Размер файла
295 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа