US1746754A - Electrical system and device - Google Patents

Electrical system and device Download PDF

Info

Publication number
US1746754A
US1746754A US724765A US72476524A US1746754A US 1746754 A US1746754 A US 1746754A US 724765 A US724765 A US 724765A US 72476524 A US72476524 A US 72476524A US 1746754 A US1746754 A US 1746754A
Authority
US
United States
Prior art keywords
transformer
tube
primary
winding
thru
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US724765A
Inventor
George G Adams
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
Priority to US724765A priority Critical patent/US1746754A/en
Application granted granted Critical
Publication of US1746754A publication Critical patent/US1746754A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00Fixed transformers or mutual inductances of the signal type
    • H01F19/04Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range

Definitions

  • My invention relates to electrical systems and devices. To be more specific my invention relates to radio receiving systems and transformer coupling means for use therein.
  • Some of the principal objects of my invention are the provision of a radio receiving system in which a larger number of radio frequency amplifying stages may be employed than have heretofore been possible due to the it so-called back coupling between the various radio frequency amplifying stages producing undesired oscillations; and the eliminationof the damping resistance heretofore employed for damping out the undesired oscil l lations.
  • Another object of my invention is the provision of transformer couplings between the various radio frequency amplification stages which have substantially no stray fields sur- 13 rounding them. This results in the elimination of back coupling between the various stages.
  • Another object of my invention is the provision of such a transformer, having low 57': manufacturing cost, simplicity of assembly and substantially no stray fields regardless of its angular mounting position.
  • Fig. 1 is a schematic diagram of a radio receiving system in which my transformer coupling means are employed.
  • Fig. 2 is a perspective view of the transformer core member.
  • Fig. 3 is a side elevation of the transformer.
  • Fig. 4 is a plan'view of the transformer.
  • Fig. 5 is a diagrammatic view indicating 10 the manner in which the primary and secondary windings are wound on the core member.
  • my radio receiving system comprises an antenna 1 connected to one terminal of the primary winding of trans former 2, the other terminal being connected to ground G as shown.
  • the secondary winding' of transformer 2 is connected across the grid-filament of a radio frequency amplifying tube 3, a variable condenser 4 being connected across the secondary windings of 1924. Serial No. 724,765.
  • transformer 2 for suitably tuning the antenna circuits to the incoming signal waves.
  • the plate-filament circuit of tube 3 comprises the primary winding of transformer 5 and plate battery B, both connected in series.
  • the secondary winding of transformer 5 is connected across the grid-filament of radio frequency amplifying tube 6 in parallel with the variable condenser 7 for suitably tuning the plate-filament circuit of tube 3, the first stage of radio frequency amplification.
  • the platefilament circuit of tube 6 comprises the primary winding of transformer 8 and the plate battery B both connected in series.
  • the secondary winding of transformer 8 is connected across the grid-filament of the detector tube 9, having the usual grid condenser 10 and grid leak 11 in shunt therewith.
  • a variable condenser 12 may be connected across the terminals of the secondary winding for suitably tuning the plate-filament circuit of tube 6, the second stage of radio frequency amplification.
  • the plate-filament circuit of the detector tube 9 may be connected to the sound reproduction device 13 through several stages of audio frequency amplification as shown.
  • the filaments of the tubes 3, 6 and 9 may be energized from a common source of power A and the currents in the individual filaments may be independently controlled by rheostats R. I
  • the core member 15 comprises a tube of suitable insulating material which may be a phenol-condensation product.
  • Two diametrically opposed vertical slots 00 and 3 are cut in the tube for the reception of the primary and secondary windings.
  • Holes 16, 17, 18 and 19 for the reception of terminals are drilled or punched in the circumferential surface of the tube below the bottoms of the slots 00 and y.
  • Holes 16 and 17 for the reception of the primary coil terminals are located to the left of slot 00, while holes 18 and 19 for the reception of the secondary coil terminals are located to the right of slot ac.
  • the transformer is wound in the following manner special reference being directed to Fig. 5.
  • One extremity of the conductor (represented by a solid line) constituting the primary coils is secured to the binding post 17' and one extremity of the conductor (repreresented by a broken line) constituting the secondary coils is secured to the binding post 18'.
  • the primary conductor is wound around the outside circumference of the tube 15 until the slot 00 is reached, the winding be ing in a counterclockwise direction.
  • the conductor is then passed thru the slot m over to and thru the slot y and then around the outside circumference of the tube 15 in a clockwise direction until opposite the binding post 18 Where the conductor constituting the secondary coils is picked up.
  • Both conductors are then wound together in a clockwise direction until the slot at is reached. They are both passed thru the slot m to and thru the slot g to the left of slot 3 They are then both wound together in a counterclockwise direction around the outside circumference of tube 15 and are then passed thru the slots 00 and y.
  • Fig. 5 is of course purelyfor illustrative purposes as only a very limited number of primary and secondary turns are shown.
  • the transformer may be provided with suitable brackets for securing the same to a rapport.
  • a transformer comprising a cylindrical core member having two diametrically opposed vertical slots and primary and secondary windings wound around the external cylindrical surface of the core member and solely thru the slots-to form a plurality of substantially double D shaped coils successive turns of said primary winding being interlaid between the successive secondary turns.
  • a transformer comprising a hollow cylindrical member provided with a pair of opposed slots, two pairs of terminals carried by said member adjacent one slot, a primary winding comprising a single layer of wire connected to one pair of terminals, and a secondary winding connected to the other pair of terminals, said windings being wound thru said slots and about the cylindrical member to form a pair of substantially double D shaped coils.
  • a transformer comprising a cylindrical member having a pair of opposed slots and a pair of apertures, two pairs of terminals mounted on said member near one end thereof, a primary winding attached to one terminal and strung thru one aperture and thence wound about said member and thru said slots to form a pair of D shaped coils, the free end of the winding being attached to another terminal, and a secondary winding attached to the other pair of terminals, said winding being strung thru the other aperture and wound into coils similar to the primary winding.
  • a radio frequency transformer comprising a cylindrical member provided with a pair of slots, a, primary and a secondary Winding each wound around said member and solely thru said slots and comprising a plurality of turns and said turns being so formed that the stray magnetic field is substantially nil, the successive turns of said primary being spaced apart and the turns of said secondary winding being wound in said spaces between the primary turns, whereby close coupling between primary and secondary is secured and the turn-to-turn capacity of said primary is small.

Description

Feb. 11, 1930. G ADAMS 1,746,754
ELECTRICAL SYSTEM AND DEVICE Filed July 8, 1924 AUDIO Alla/0 mm. 4MB min, 4MB
INVENTOR 322?: G. ADAMS A ORNEY Patented Feb. 11, 193i) UNTED STATES PATENT OFFICE GEORGE G. ADAMS, OF BROOKLYN, NEW YORK, ASSIGNOR TO RADIO CORPORATION OF AMERICA, A CORPORATION OF DELAWARE ELECTRICAL SYSTEM AND DEVICE Application filed July 8,
My invention relates to electrical systems and devices. To be more specific my invention relates to radio receiving systems and transformer coupling means for use therein.
Some of the principal objects of my invention are the provision of a radio receiving system in which a larger number of radio frequency amplifying stages may be employed than have heretofore been possible due to the it so-called back coupling between the various radio frequency amplifying stages producing undesired oscillations; and the eliminationof the damping resistance heretofore employed for damping out the undesired oscil l lations.
Another object of my invention is the provision of transformer couplings between the various radio frequency amplification stages which have substantially no stray fields sur- 13 rounding them. This results in the elimination of back coupling between the various stages.
Another object of my invention is the provision of such a transformer, having low 57': manufacturing cost, simplicity of assembly and substantially no stray fields regardless of its angular mounting position.
Other objects and advantageswill be apparent from the following description of the invention taken in conjunction with the accompanying drawing, in which:
Fig. 1 is a schematic diagram of a radio receiving system in which my transformer coupling means are employed.
Fig. 2 is a perspective view of the transformer core member.
Fig. 3 is a side elevation of the transformer.
Fig. 4 is a plan'view of the transformer.
Fig. 5 is a diagrammatic view indicating 10 the manner in which the primary and secondary windings are wound on the core member.
Referring to Fig. 1, my radio receiving system comprises an antenna 1 connected to one terminal of the primary winding of trans former 2, the other terminal being connected to ground G as shown. The secondary winding' of transformer 2 is connected across the grid-filament of a radio frequency amplifying tube 3, a variable condenser 4 being connected across the secondary windings of 1924. Serial No. 724,765.
transformer 2 for suitably tuning the antenna circuits to the incoming signal waves.
The plate-filament circuit of tube 3 comprises the primary winding of transformer 5 and plate battery B, both connected in series. The secondary winding of transformer 5 is connected across the grid-filament of radio frequency amplifying tube 6 in parallel with the variable condenser 7 for suitably tuning the plate-filament circuit of tube 3, the first stage of radio frequency amplification.
The platefilament circuit of tube 6 comprises the primary winding of transformer 8 and the plate battery B both connected in series. The secondary winding of transformer 8 is connected across the grid-filament of the detector tube 9, having the usual grid condenser 10 and grid leak 11 in shunt therewith. A variable condenser 12 may be connected across the terminals of the secondary winding for suitably tuning the plate-filament circuit of tube 6, the second stage of radio frequency amplification.
The plate-filament circuit of the detector tube 9 may be connected to the sound reproduction device 13 through several stages of audio frequency amplification as shown. The filaments of the tubes 3, 6 and 9 may be energized from a common source of power A and the currents in the individual filaments may be independently controlled by rheostats R. I
While I have shown and described my transformer coupling as embodied in a radio receiving system, I wish it distinctly understood that I do not limit myself to such an embodiment but may employ it in various other electrical circuits where the elimination of back coupling is desired.
Although I have shown and described only two stages of radio frequency amplification in my system, I wish it to be understood that I may employ a considerably larger number of such stages, the schematic diagram of my system being for illustrative purposes only.
It now remains to describe the similar transformer coupling means 2, 5 and 8. Referring to Figs. 2, 3, 4 and 5, the core member 15 comprises a tube of suitable insulating material which may be a phenol-condensation product. Two diametrically opposed vertical slots 00 and 3 are cut in the tube for the reception of the primary and secondary windings. Holes 16, 17, 18 and 19 for the reception of terminals are drilled or punched in the circumferential surface of the tube below the bottoms of the slots 00 and y. Holes 16 and 17 for the reception of the primary coil terminals are located to the left of slot 00, while holes 18 and 19 for the reception of the secondary coil terminals are located to the right of slot ac.
The transformer is wound in the following manner special reference being directed to Fig. 5. One extremity of the conductor (represented by a solid line) constituting the primary coils is secured to the binding post 17' and one extremity of the conductor (repreresented by a broken line) constituting the secondary coils is secured to the binding post 18'. The primary conductor is wound around the outside circumference of the tube 15 until the slot 00 is reached, the winding be ing in a counterclockwise direction. The conductor is then passed thru the slot m over to and thru the slot y and then around the outside circumference of the tube 15 in a clockwise direction until opposite the binding post 18 Where the conductor constituting the secondary coils is picked up. Both conductors are then wound together in a clockwise direction until the slot at is reached. They are both passed thru the slot m to and thru the slot g to the left of slot 3 They are then both wound together in a counterclockwise direction around the outside circumference of tube 15 and are then passed thru the slots 00 and y.
Emerging from the slot 3 they are again wound together in a clockwise direction around the outside circumference of the tube 15. After a sufficient number of primary turns have been wound on in the above described manner, the other extremity of the primary conductor is passed thru a hole 20 drilled near the top of the tube 15 and diametrically opposite the terminal 16' and carried down and secured to the terminal 16'.
In a similar manner, the other extremity of the secondary conductor is passed thru the drilled hole 21 diametrically opposite the terminal 19 and is secured thereto. Fig. 5 is of course purelyfor illustrative purposes as only a very limited number of primary and secondary turns are shown. The transformer may be provided with suitable brackets for securing the same to a rapport.
If a current is assumed flowing in the primary winding as shown by the arrows. the lines of magnetic flux due to the left hand turns of the primary winding will tend to be in an upward direction in the outside space to the left of tube 15 and in a downward direction in the space inside tube 1.5-, T lines of magnetic flux due to the right hand turns of the primary winding will tend to be in a downward direction in the outside space to the right of tube 15 and will tend to be in an upward direction in the space inside of the tube. These two fluxes being in opposite directions will neutralize each other resulting in the substantial elimination of external magnetic fields in the outside space around the transformer. The substantial elimination of external magnetic fields due to the secondary coils is similarly effected. The elimination of the external magnetic fields results regardless of the position in which the transformer is mounted.
While I have shown and described my transformer for use in radio receiving systems, I do not limit myself to such use but may design it and use it for other purposes where a transformer coupling possessing similar characteristics is desired.
While I have shown and described preferred embodiments of my invention, I do not limit myself to said embodiments; but may employ such other embodiments as come within the spirit and scope of the invention.
Having described my invention what I claim is:
1. A transformer comprising a cylindrical core member having two diametrically opposed vertical slots and primary and secondary windings wound around the external cylindrical surface of the core member and solely thru the slots-to form a plurality of substantially double D shaped coils successive turns of said primary winding being interlaid between the successive secondary turns.
2. A transformer comprising a hollow cylindrical member provided with a pair of opposed slots, two pairs of terminals carried by said member adjacent one slot, a primary winding comprising a single layer of wire connected to one pair of terminals, and a secondary winding connected to the other pair of terminals, said windings being wound thru said slots and about the cylindrical member to form a pair of substantially double D shaped coils.
3. A transformer comprising a cylindrical member having a pair of opposed slots and a pair of apertures, two pairs of terminals mounted on said member near one end thereof, a primary winding attached to one terminal and strung thru one aperture and thence wound about said member and thru said slots to form a pair of D shaped coils, the free end of the winding being attached to another terminal, and a secondary winding attached to the other pair of terminals, said winding being strung thru the other aperture and wound into coils similar to the primary winding.
4. A radio frequency transformer comprising a cylindrical member provided with a pair of slots, a, primary and a secondary Winding each wound around said member and solely thru said slots and comprising a plurality of turns and said turns being so formed that the stray magnetic field is substantially nil, the successive turns of said primary being spaced apart and the turns of said secondary winding being wound in said spaces between the primary turns, whereby close coupling between primary and secondary is secured and the turn-to-turn capacity of said primary is small.
GEORGE G. ADAMS.
US724765A 1924-07-08 1924-07-08 Electrical system and device Expired - Lifetime US1746754A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US724765A US1746754A (en) 1924-07-08 1924-07-08 Electrical system and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US724765A US1746754A (en) 1924-07-08 1924-07-08 Electrical system and device

Publications (1)

Publication Number Publication Date
US1746754A true US1746754A (en) 1930-02-11

Family

ID=24911814

Family Applications (1)

Application Number Title Priority Date Filing Date
US724765A Expired - Lifetime US1746754A (en) 1924-07-08 1924-07-08 Electrical system and device

Country Status (1)

Country Link
US (1) US1746754A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188555A (en) * 1960-12-27 1965-06-08 Ibm Saturable reactor voltage regulator with series connected main and control inductance windings
US5061891A (en) * 1988-11-21 1991-10-29 Yazaki Corporation Cross coil
US5243277A (en) * 1988-11-21 1993-09-07 Yazaki Corporation Cross coil meter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188555A (en) * 1960-12-27 1965-06-08 Ibm Saturable reactor voltage regulator with series connected main and control inductance windings
US5061891A (en) * 1988-11-21 1991-10-29 Yazaki Corporation Cross coil
US5243277A (en) * 1988-11-21 1993-09-07 Yazaki Corporation Cross coil meter

Similar Documents

Publication Publication Date Title
US1942575A (en) Electrostatic shielding material
US1746754A (en) Electrical system and device
US1647372A (en) Long-wave or intermediate-frequency transformer
US1837413A (en) Inductive coupling device
US2205365A (en) Radio receiver
US1577421A (en) Means for eliminating magnetic coupling between coils
US2246385A (en) Signal collecting system for radio receivers
US1905216A (en) Radio receiving apparatus
US1691125A (en) Transformer
US1989205A (en) Multiple coil assembly
US1718255A (en) Apparatus for wireless telephony and telegraphy
US1868607A (en) Electromagnetic sound reproducer system
US1561782A (en) Inductance coil
US1798012A (en) Art of radiosignaling
US1552828A (en) Radio frequency transformer
US2096801A (en) Power transformer
US1984979A (en) Radiofrequency transformer and ribbon winding therefor
US1824726A (en) Inductance coil
US1829058A (en) High frequency transformer
US1731013A (en) Radiofrequency amplification system
US2243180A (en) All-wave radio receiving system
US1666505A (en) Radio appliance
US1870038A (en) Amplifying system
US1927672A (en) Wave signaling system
US1794897A (en) Radio frequency transformer