Improvements connected with Electric Circuits for Varying, Regulating, or Controlling the Pressure of Electric Currents therein.
Year: 1892

page_text: Date of Application, 2nd Mar., 1892
Complete Specification Left, 2nd Jan., 1893--Accepted, 4th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements connected with Electric Circuits for Varying,
Regulating, or Controlling the Pressure of Electric Currents
therein.
HENRY EDMUNDS of 39 Victoria Street in the City of Westminster
Electrical Engineer do hereby declare the nature of this invention to be as
follows:-
'
My inventien has for one of its objects to provide means in connection with
electric circuits whereby although the pressure may remain constant or practically
constant in the main circuit it can be augmented when necessary for particular
purposes such for instance as for effecting the charging of secondary batteries.
The means according to my invention can be used generally to control vary or
regulate the pressure at points where it is desirable to augment reduce or control it.
According to my invention I employ in series with the main at the place or places
where the pressure is to be controlled augmented or reduced a generator of
electricity which is capable of supplementing or reducing the pressure of the
mains. For example in charging secondary batteries from a main supplied with
current of constant or partially constant pressure I place in series with the main
leading to and from such batteries a dynamo which is capable of supplementing
the pressure of the current in the mains to an extent sufficient to enable the
batteries to be charged by the current which if not so supplemented would be of
insufficient pressure to charge them.
A.s
The said supplementary dynamo in the main is therefore only of such size or
power as is necessary to supply the extra pressure required to enable the current of
the main to continue the charging until the batteries are sufficiently charged.
the supplementary pressure must be increased as the batteries become charged,
I provide means whereby the supplementary dynamo supplies more and more extra
or supplementary pressure of current to the charging current as the batteries
become charged. To this end the supplementary dynamo may be driven by a
motor which is energised by a current from the main. The regulation of the
pressure may be controlled by varying the strength of the field magnet or magnets
of either the motor or of the dynamo or of both or by varying the amount of
current through the armature of the motor.
In charging exhausted batteries the charging may be commenced by the current
at the pressure of the mains alone but as the counter electro motive force of the
batteries increases as the charging proceeds the supplementary dynamo will be
operated in such a way as to supply the supplementary pressure which is required
to effectually charge the batteries.
For purposes of reducing pressure from a main or supply of electricity instead
of inserting resistances may use an arrangement of the kind herein before
described in which a supplementary dynamo in series with the main or supply is
operated so that its pressure is opposed to the pressure of the current of the
main or supply, thereby effecting the required reduction of the pressure from the
main or supply.
Where it is desirable to supplement the pressure in a main for example at a
distance from the generator where the pressure of the current may have been
reduced by resistance of the line, I can insert in the line a supplementary dynamo
which may be operated by a motor driven from the source of supply as herein-

page_text: before described thereby augmenting the pressure in the mains beyond the
supplementary dynamo as may be desired.
Dated this 2nd day of March 1892
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, Agents.
COMPLETE SPECIFICATION.
Improvements connected with Electric Circuits for Varying,
Regulating, or Controlling the Pressure of Electric Currents
therein.
1, HENRY EDMUNDS of 39 Victoria Street, in the City of Westminster,
Electrical Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
My invention has for one of its objects to provide means in connection with
electric circuits whereby although the pressure may remain constant or practically
constant in the main circuit it can be augmented when necessary for particular
purposes such for instance as for effecting the charging of secondary batteries.
The means according to my invention can be used generally to control vary or
regulate the pressure at points where it is desirable to augment reduce or control it.
According to my invention (which I will hereinafter more fully explain with
reference to the accompanying diagrams) I employ in series with the main at the
place where the pressure is to be controlled augmented or reduced an electrically
driven generator of electricity which is capable of supplementing or reducing
the pressure of the mains. For example in charging secondary batteries from a
main (a Figure 1) supplied from a source a² with current of constant or practically
constant pressure I place in series with the main or branch leading to and from
such batteries can electrically driven dynamo & which is capable of supplementing
the pressure of the current in the mains to an extent sufficient to enable the
batteries to be charged by the current whereas the pressure if not so supple-
mented would be insufficient to charge them. The said electrically driven dynamo
so provided in the main (and which I will call the current controller) is therefore
only of such size or power as is necessary to supply the extra pressure required
to enable the charging current of the main to continue to flow until the batteries
are sufficiently charged. As the supplementary pressure must be increased as the
batteries become charged I provide means whereby the current controller supplies
more and more extra or supplementary pressure of current to the charging circuit
as the batteries become charged. To this end the supplementary dynamo is
driven by an electric motor e which may be energised by a current from the main.
The regulation of the pressure may be controlled by varying the strength of
the field magnet or magnets of either the motor or of the dynamo or of both
or by varying the amount of current through the armature of the motor.
The
In Figure 11 have shewn the field or fields of both the motor and the dynamo'
as being energised by a circuit f between the terminals of the battery c.
motor and dynamo may have one common field or independent fields and the
field or fields may be wound in series shunt compound or differentially in order
that the field strength may automatically vary according to the conditions and
cause the armature to give out just that supplementary pressure which is required
from time to time.
In charging exhausted batteries the charging may be commenced by the current
at the pressure of the mains alone but as the counter electro motive force of
the batteries increases as the charging proceeds the current controller will be
operated in such a way as to supply the supplementary pressure which is required
to effectually charge the batteries.
This can be effected by a switch which at first connects the batteries and not

page_text: the current controller with the main and afterwards at the requisite time puts
also the current controller into the charging circuit. This switch may be operated
either manually or automatically from the current itself.
For the purpose of reducing pressure from a main or supply of electricity
instead of inserting resistances I may use an arrangement of the kind herein before
described in which the current controller is operated so that. its pressure is
opposed to the pressure of the current of the main or supply thereby effecting
the required reduction of the pressure from the main or supply.
Where it is desirable to supplement the pressure in a main (Figure 2) for
example at a distance from the generator a where the pressure of the current
may have been reduced by resistance of the line can insert in the line a current
controller (d and e) thereby augmenting the pressure in the mains beyond the
current controller as may be desired.
The same current controller may be employed with switches (either hand or
automatic) to oppose or supplement a pressure in a main as required from time
to time.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In connection with electric circuits for varying regulating or controlling the
pressure of electric currents therein the introduction of a combination of electric
motor and generator (the armature of the generator being inserted in the main)
where the pressure is to be varied, controlled, augmented or reduced substantially
as hereinbefore explained.
2. In connection with electric circuits wherein the main is supplied with current
of constant or practically constant pressure an electrically driven dynamo with its
armature in series with secondary batteries or accumulators and capable of supple-
menting or controlling the pressure of the current in the mains substantially as
hereinbefore described.
3. The combination with the subject matter of the preceding second claiming
clause of means whereby the electrically driven dynamo varies the pressure of
cifrrent to or from the batteries substantially as hereinbefore described.
4. For varying the pressure of current in electric circuits an electrically driven
dynamo operated so that its pressure can be opposed to, or supplement, that of the
main or supply substantially as hereinbefore described.
Dated this 2nd day of January 1892.
J. H. JOHNSON & Co.,
Agents.