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Патент USA US3030558

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April 17, 1962
w. J. JOHNSTON
3,030,548
IGNITION CIRCUIT
Filed March 7, 1960
421
INVENTOR.
William J Johns/on
B
Y mam
H/s Al/omey
United States Patent-"O
"
3,030,548
C6
1
Patented Apr. 17, 1962
2
3,030,548
secondary winding 24, are connected with a spark dis
charge device which is designated by reference numeral
32. It will be appreciated that the spark discharge device
IGNITION CIRCUIT
William J. Johnston, Flint, Mich, assignor to General
Motors Corporation, Detroit, Mich., a corporation of
will be positioned'within an engine so as to ignite the
4 Claims. (Cl. 315-—177)
nated by reference numeral 34 is connected across the
leads 26 and 28.
Delaware
Filed Mar. 7, 1960, Ser. No. 13,346
combustible mixture of the engine. A condenser desig
In operation of the device, when the lead wires 12 and
14 are energized by alternating current, the condenser 18
more particularly to ignition systems for use with rocket 10 is charged during the ?rst quarter cycle of each half cycle
This invention relates to electric ignition systems and
engines and the like,
,
I
The present invention contemplates providing an electric
, of the alternating current. The resistance value of resist
- ance 16 and the capacitance of capacitor 18 are so chosen
ignition system that includes a capacitor and a circuit
element that breaks down to conduction when a predeter
L
that the capacitor will attain a charge su?icient to break
down the tube 30 on each half cycle of the alternating
mined voltage is applied across it. The capacitor and 15 current. Thus, where the alternating current applied to
circuit element are connected in such a manner that the
leads 12 and 14 is 115 volts R.M.S. or 162 volt peak, the
circuit element breaks down to complete a work circuit
breakdown voltage of the tube is 90 volts R.M.S. or 127
whenever the capacitor is charged to a predetermined
volts peak. Thus, it is clearly apparent that the condenser
voltage.
18 will be charged and discharged on each half cycle of
In circuits of the type described, the capacitor has been
the alternating current, the condenser discharging when
charged from a direct current source. This has required
ever the voltage across it attains the predetermined break
the use of one or more recti?ers and in some instances
down voltage of gas tube 30.
the use of an expensive and cumbersome apparatus such
When the condenser 18 discharges through the gas tube
as dynamotors.
It is accordingly an object of this invention to provide
an electric ignition system of the type described that is
30 and through the primary winding 22 of ignition coil
20 a high voltage is induced in thesecondary winding 24.
This voltage is applied to the condenser 34 and when the
energized directly by alternating current, thus eliminating
condenser has been charged to a value of voltage suffi
the need for recti?ers, dynamotors and the like.
cient to break down the spark discharge device 32, an arc
Another object of this invention is to provide an elec
is caused to jump across the spark discharge device.
trical ignition system that is powered by alternating cur 30 It can be seen from the foregoing that the sparking rate
rent and wherein the sparking rate of the ignition system
across spark discharge device 32 will be equal to twice the
is a function of the frequency of the alternating current.
frequency of the voltage applied to leads 12 and 14. Thus,
Another object of this invention is to provide an elec
where 60-cycle A.C. voltage is employed, the sparking
trical ignition system that includes a ?rst condenser, a
transformer, a circuit element having a predetermined
breakdown voltage and a second condenser; the ?rst con
denser, primary winding of the transformer and circuit
rate will be 120 cycles per second.
It is important in the design of this circuit that the RC.
time constant of resistor 16 and capacitor 18 be of such
a value that the condenser 18 attains a sufficient charge
to break down the gas tube 30 during the ?rst quarter
‘ element being interconnected while the second condenser
is connected across the secondary winding of the trans
cycle of each half cycle of the applied voltage.
former and across a spark discharge device.
40
While the embodiments of the present invention as
Further objects and advantages of the present inven
herein disclosed constitute a preferred form, it is to be
(r
tion will be apparent from the following description, refer
ence being had to the accompanying drawings wherein
preferred embodiments of the present invention are clearly
shown.
In the drawings, the single FIGURE drawing illustrates
an electrical ignition system made in accordance with this
invention.
Referring now to the drawing, a source of alternating
current is designated by reference numeral 10. The alter
understood that other forms might be adopted.
What is claimed is as follows:
_l. An ignition system comprising, a source of alter
nating current, an ignition transformer having a primary
winding and a secondary winding, a spark discharge de
vice connected With secondary winding, a resistor, a capac
itor, means connecting the primary winding of said igni
tion coil, said resistor and said capacitor in series and
winding 22 of the ignition coil is connected in series with
across said source of alternating current, a circuit element
having a predetermined breakdown voltage, and means
connecting said circuit element across said source of alter
nating current with one side thereof being connected be
tween said series connected resister and said capacitor,
the resistance value of said resistor and the capacitance
value of said capacitor having an RC. time constant of
such a value that said capacitor attains the predetermined
breakdown voltage of said circuit element twice in each
capacitor 18 and is connected with lead wire 14 as is
cycle of said alternating current.
nating current source 10 is connected with lead wires 12
and 14 which form the input leads for the circuit. A re
sistor designated by reference numerals 16 is connected in
series with lead wire 12 and is connected in series with
a capacitor designated by reference numeral 18. An
ignition coil or step-up transformer designated in its en
tirety by reference numeral 20 is provided. The primary
clearly apparent from the drawing. A secondary winding
2. An electrical ignition system comprising, a source
of transformer 20 is designated by reference numeral 24
of alternating current, a pair of lead wires connected with
and it is seen that this secondary winding feeds a circuit
said source, a circuit element having a predetermined
including lead wires 26 and 28.
breakdown voltage, a resistor, a ?rst capacitor, an ignition
A circuit element designated by reference numeral 30
coil having a primary winding and a secondary winding,
65
is provided which is connected across input leads 12 and
means connecting said resistor and said capacitor and said
14, one side of which is connected between resistor 16 and
primary winding of said ignition coil across said voltage
capacitor 18. The circuit element 30 has a predetermined
source, means connecting said circuit element across said
breakdown voltage and may be, for example, a gas tube
lead wires with one side thereof being connected between
that is ?lled with inert gases and which breaks down when
said resistor and said capacitor, a spark discharge device
a predetermined voltage is applied across it. The break 70 connected with said secondary winding of said trans
down phenomena in such a case is actually an arc.
The lead wires 26 and 28, which are connected with
former, and a second capacitor connected across said sec
ondary winding.
3,030,541;
3
3. An electrical ignition system comprising, a source of
alternating current, an ‘ignition transformer having a pri
mary winding and a secondary winding, a capacitor, a
series charging #circuit -for said-capacitor including‘ a re
sister and the primary winding of said ignition trans
former, a discharging circuit for said ‘capacitor including
the primary winding of said ignition coil and a circuit
element ‘having 1a predetermined breakdown voltage, a
spark discharge device, and means connecting said spark
discharge device with the secondary winding ofsaid igni 10
tion' transformer, said resistor and capacitor having an
R.C; time constant of such a value that said condenser
discharges through the primary winding of said ignition
winding and a secondary winding, a series circuit connect
in-g said lead ‘wires and ‘including va resistor, a capacitor
and the primary winding ofvsaid ignition coil, a circuit
element having a predetermined breakdown voltage, and
means connecting said circuit {element across said lead
wires and in parallel with ‘said primary winding and
capacitor.
References Cited in the ?le of this patent
UNITED ‘STATES PATENTS
2,030,228
2,071,573
‘2,093,848
Randolph et a1. _______ .._ Feb. 11, 1936
Randolph et'al. _______ ._ ‘Feb. 23, ‘1937
Randolph ~et a1. _____ _._ Sept. '21, 1937
2,551,101
Lang ________________ __ Feb. 14, 1950
Dehenham et-al _________ __ May 1, '1951
'Tognola _____________ __ vSept. 1, '19'53
coil ,at ‘a ‘rate which is a function :of the frequency of :the
2,197,114
15 12,497,307
alternating current source.
14.
ignition system comprising, ‘a pair of lead wires
adapted to be ‘connected directly across a source of alter
nating current, an ignition transformer having ‘a primary
2,651,005
Rabezzana et al. .....7..... Apr. 16, ‘1940
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