JPS5761371A - Power supply circuit for telephone - Google Patents
Power supply circuit for telephoneInfo
- Publication number
- JPS5761371A JPS5761371A JP13622980A JP13622980A JPS5761371A JP S5761371 A JPS5761371 A JP S5761371A JP 13622980 A JP13622980 A JP 13622980A JP 13622980 A JP13622980 A JP 13622980A JP S5761371 A JPS5761371 A JP S5761371A
- Authority
- JP
- Japan
- Prior art keywords
- letter
- coil
- telephone
- coils
- current
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/001—Current supply source at the exchanger providing current to substations
- H04M19/003—Arrangements for compensation of the DC flux in line transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
PURPOSE:To replace a letter coil with a small one, by erasing DC magnetic field occurred with each other by setting the current in the same direction in the letter coil, fellow of telephone. CONSTITUTION:A capacitor 4 is installed between a letter coil 3 and a telephone 1 and install letter coils 5 and 6 on the both extremes of the capacitor 4. A letter coil 5 is connected to the letter coil 3 and connect a letter coil 6 to a negative power source. Then, DC current is flowed in order of letter coil 2 telephone 1 letter coil 5 letter coil 3 letter coil 6. Therefore, in the letter coils 2 and 3, and 5 and 6, as shown in the figure with an arrow mark, a current is flowed in the same direction and respective DC magnetic fields occurred are erased. By this reason, the condition of the letter coils 2 and 3, and 5 and 6 becomes the same condition as that a current does not practically flow in. Then, even if the voice signal is doubled, the margin to a saturation point becomes large and letter coils can be replaced with small ones.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13622980A JPS5761371A (en) | 1980-09-30 | 1980-09-30 | Power supply circuit for telephone |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13622980A JPS5761371A (en) | 1980-09-30 | 1980-09-30 | Power supply circuit for telephone |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5761371A true JPS5761371A (en) | 1982-04-13 |
Family
ID=15170299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13622980A Pending JPS5761371A (en) | 1980-09-30 | 1980-09-30 | Power supply circuit for telephone |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5761371A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02165758A (en) * | 1988-12-20 | 1990-06-26 | Nec Corp | Isdn network terminating equipment |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3548109A (en) * | 1966-09-19 | 1970-12-15 | Siemens Ag | Telephone relay and associated circuit |
-
1980
- 1980-09-30 JP JP13622980A patent/JPS5761371A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3548109A (en) * | 1966-09-19 | 1970-12-15 | Siemens Ag | Telephone relay and associated circuit |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02165758A (en) * | 1988-12-20 | 1990-06-26 | Nec Corp | Isdn network terminating equipment |
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