GB957803A - Improvements in or relating to signalling receivers - Google Patents
Improvements in or relating to signalling receiversInfo
- Publication number
- GB957803A GB957803A GB23467/60A GB2346760A GB957803A GB 957803 A GB957803 A GB 957803A GB 23467/60 A GB23467/60 A GB 23467/60A GB 2346760 A GB2346760 A GB 2346760A GB 957803 A GB957803 A GB 957803A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- relay
- cut
- electrode
- voltage
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
- H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
- H03K17/0814—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit
- H03K17/08146—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit in bipolar transistor switches
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/14—Arrangements providing for calling or supervisory signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Relay Circuits (AREA)
- Electronic Switches (AREA)
Abstract
957,803. Transistor switching circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. July 5, 1960 [July 8, 1959], No. 23467/60. Heading H3T. Overloading of the switching transistor 9 of a relay switching circuit due to transients developed by the relay winding 6 when the current thereto is cut off is prevented by connecting a further transistor 14 in series with the transistor 6, the base electrode of this transistor being connected through a resistor 15 to the collector-voltage supply terminal. As applied to a carrier-wave-telephony system incoming negative-going signalling pulses are applied to the base electrode of transistor 9, which is normally cut off by the bias applied to its emitter electrode, to render the transistor conducting. Transistor 14 conducts simultaneously and relay 6 is energized. At the end of the pulse transistor 9 is cut off and its collector electrode instantaneously assumes the voltage at the base of transistor 14, i.e. the value of the supply voltage while any transient produced by the winding 6 and applied to transistor 14 is effectively reduced in value by the same amount. The effect of transients is further reduced by resistor 16 and capacitor 17.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL241067 | 1959-07-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB957803A true GB957803A (en) | 1964-05-13 |
Family
ID=19751818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23467/60A Expired GB957803A (en) | 1959-07-08 | 1960-07-05 | Improvements in or relating to signalling receivers |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS381814B1 (en) |
| DE (1) | DE1128465B (en) |
| FR (1) | FR1262263A (en) |
| GB (1) | GB957803A (en) |
| NL (2) | NL109531C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1956621A1 (en) * | 2007-02-12 | 2008-08-13 | Thales Security Solutions & Services GmbH | Relay switching-on circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1020673B (en) * | 1955-10-06 | 1957-12-12 | Siemens Ag | Method and device for the joint control of several semiconductor switches in series |
| DE1081505B (en) * | 1958-09-18 | 1960-05-12 | Licentia Gmbh | Transistor switch for quick demagnetization of inductive power consumers |
| DE1071133B (en) * | 1958-08-08 | 1959-12-17 | Standard Efcktrik Lorenz Aktiengesellschaft, Stuttgart-Zuffenhausen | ARRANGEMENT FOR LIMITING DISCONNECTING VOLTAGES AT INDUCTIVITIES IN A SERIES WITH TRANSISTOR SWITCHES |
-
0
- NL NL241067D patent/NL241067A/xx unknown
- NL NL109531D patent/NL109531C/xx active
-
1960
- 1960-07-05 GB GB23467/60A patent/GB957803A/en not_active Expired
- 1960-07-05 DE DEN18581A patent/DE1128465B/en active Pending
- 1960-07-08 FR FR832437A patent/FR1262263A/en not_active Expired
-
1965
- 1965-07-06 JP JP3033965A patent/JPS381814B1/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1956621A1 (en) * | 2007-02-12 | 2008-08-13 | Thales Security Solutions & Services GmbH | Relay switching-on circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| FR1262263A (en) | 1961-05-26 |
| NL241067A (en) | |
| DE1128465B (en) | 1962-04-26 |
| NL109531C (en) | |
| JPS381814B1 (en) | 1963-03-07 |
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