US3851098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse transmitter for transmission line
Assignee: International Standard Electric Corp
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Filing: 1973-06-14
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Granted: 1974-11-26
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Expires: 1993-06-14
Abstract
Abstract A pulse transmitter is coupled to the transmission line through a pulse transformer, and at the end of a produced pulse, there occurs in the transformer a reverse voltage peak due to the fact that the magnetizing transformer current does not instantaneously vary when switched. The magnetizing current decreases and must be nulled before the generation of the next pulse. According to the invention, the reverse peak is utilized for accelerating such a magnetic current decrease, by diminishing the transformer damping.
Inventors
- 👤 B Pingault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:44
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/57; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
201 words
A pulse transmitter for use with a two-wire transmission line comprising: a transformer having a primary winding and a secondary winding coupled across said two-wire transmission line; a storage capacitor having one terminal coupled to one terminal of said primary winding and the other terminal connected to ground, discharge of said storage capacitor through said primary winding producing a pulse for application to said twowire transmission line; a first normally non-conductive transistor having its base coupled to a control input, its emitter connected to ground and its collector coupled to the other terminal of said primary winding, a control signal of given polarity applied to said control input rendering said first transistor conductive to discharge said storage capacitor; and a second normally non-conductive transistor having its base coupled to said one terminal of said primary winding, its emitter coupled to said one terminal of said storage capacitor and its collector coupled to a power supply having a predetermined polarity, said second transistor being rendered conductive by a reciprocal current peak amplitude produced in said transformer after said storage capacitor produces said pulse to recharge said storage capacitor by a charging current having an amplitude proportional to said reciprocal current peak amplitude.
Claim 2
Dependent Claim
201 words
A pulse transmitter for use with a two-wire transmission line comprising: a transformer having a primary winding and a secondary winding coupled across said two-wire transmission line; a storage capacitor having one terminal coupled to one terminal of said primary winding and the other terminal connected to ground, discharge of said storage capacitor through said primary winding producing a pulse for application to said twowire transmission line; a first normally non-conductive transistor having its base coupled to a control input, its emitter connected to ground and its collector coupled to the other terminal of said primary winding, a control signal of given polarity applied to said control input rendering said first transistor conductive to discharge said storage capacitor; and a second normally non-conductive transistor having its base coupled to said one terminal of said primary winding, its emitter coupled to said one terminal of said storage capacitor and its collector coupled to a power supply having a predetermined polarity, said second transistor being rendered conductive by a reciprocal current peak amplitude produced in said transformer after said storage capacitor produces said pulse to recharge said storage capacitor by a charging current having an amplitude proportional to said reciprocal current peak amplitude.
Claim 3
Dependent Claim
31 words
A pulse transmitter according to claim 1, wherein each of said first and second transistors are NPN transistors, and each of said given and said predetermined polarity is a positive polarity.
Claim 4
Dependent Claim
34 words
A pulse transmitter according to claim 1, further including a diode coupled between one terminal of said secondary winding and one wire of said transmission line to isolate said transmitter from said transmission line.
Claim 5
Dependent Claim
105 words
A pulse transmitter according to claim 1, further including a first diode coupled between said emitter and said base of said second transistor to protect said second transistor against reverse voltage occuring at the beginning of producing said pulse; a first resistor coupled between the base of said second transistor and the collector of said first transistor to provide damping for said transformer; a second resistor coupled between said collector of said second transistor and said one terminal of said storage capacitor to provide an initial charge for said storage capacitor; and a decoupling capacitor coupled between said collector of said second transistor and ground.
Claim 6
Dependent Claim
35 words
A pulse transmitter according to claim 4, further including a second diode coupled between one terminal of said secondary winding and one wire of said transmission line to isolate said transmitter from said transmission line.
Claim 7
Dependent Claim
30 words
A pulse transmitter according to claim 5, wherein each of said first and second transistors are NPN transistors, and each of said given and predetermined polarity is a positive polarity.
References Cited (Backward Citations)
US3660685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |