GB902751A - Improvements in or relating to electronic relay devices - Google Patents
Improvements in or relating to electronic relay devicesInfo
- Publication number
- GB902751A GB902751A GB1573459A GB1573459A GB902751A GB 902751 A GB902751 A GB 902751A GB 1573459 A GB1573459 A GB 1573459A GB 1573459 A GB1573459 A GB 1573459A GB 902751 A GB902751 A GB 902751A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- rectifiers
- signal
- control
- knee
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Rectifiers (AREA)
Abstract
902,751. Diode-switching circuits. TELEFONAKTIEBOLAGET L. M. ERICSSON. May 7, 1959 [May 9, 1958], No. 15734/59. Class 40 (6). In a switch or gate in which a signal is controlled by a D.C. control voltage two rectifiers are connected in parallel with the control voltage and directed so as to conduct in the same direction. The rectifiers have a sharp " knee " in their characteristics at a predetermined voltage, so that the switch has a high attenuation when the control voltage is not applied to it provided that the voltage of the signal to be switched is below that corresponding to the " knee " of the characteristic of the rectifiers. Fig. 1 shows a circuit for switching a signal from a generator 1 to a load 9 in dependence upon a D.C. control voltage applied between terminals 14, 15. Rectifiers 5, 6 are constituted by Zener diodes having a sharp " knee " in their voltage current characteristics, Fig. 2 (not shown). When terminal 14 is positive with respect to terminal 15 diodes 5 and 6 are conductive and diodes 10 and 11 cut-off so that the signal 1 is connected to load 9. When the D.C. voltage has the opposite polarity diodes 5 and 6 are blocked and 10 and 11 conductive so that the switch is open. When the D.C. circuit is broken so that the rectifiers are unbiased, provided that the voltage of signal source 1 is below the potential of the " knee," the switch presents a high attenuation to the signal source 1. In the modification shown in Fig. 3 the rectifiers 10, 11 are replaced by a resistor 16 and the combination of a resistor 17 and rectifier 18 across the D.C. control supply removes the value of the input resistance from that of the control circuit. In a further modification of Fig. 1, the terminal 15 of the control source is applied to the mid-point of a resistive potential divider connected across the primary of transformer 4, Fig. 4 (not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE447158 | 1958-05-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB902751A true GB902751A (en) | 1962-08-09 |
Family
ID=20264273
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1573459A Expired GB902751A (en) | 1958-05-09 | 1959-05-07 | Improvements in or relating to electronic relay devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB902751A (en) |
-
1959
- 1959-05-07 GB GB1573459A patent/GB902751A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3784846A (en) | Solid state motor controller for disconnecting a motor from a power source when a predetermined undervoltage condition persists for a predetermined time | |
GB681330A (en) | Electronic switching networks | |
GB1514662A (en) | Protection device for a subscriber's telephone set | |
GB882126A (en) | Improvements in or relating to electrical inverter systems | |
ES423797A1 (en) | Method and system to protect electronic switching components | |
GB1031465A (en) | Alternating current overload protection circuits | |
GB1126840A (en) | Load commutation system for regulating transformers | |
GB1137437A (en) | Arc suppressing circuits | |
ES294099A1 (en) | Electronic tap changing transformer systems | |
GB902751A (en) | Improvements in or relating to electronic relay devices | |
GB925027A (en) | A protective circuit arrangement for transistors | |
US2636931A (en) | Electric delay system | |
GB1037407A (en) | Improvements in or relating to electric bistable devices | |
GB950183A (en) | Improvements in and relating to electrical circuits employing transistor networks | |
US3162790A (en) | Transistor relay circuit | |
GB976862A (en) | Improvements in or relating to automatic circuit breakers | |
GB927468A (en) | A power dissipation protection (or reducing) circuit for transistor switches having inductive loads | |
GB926762A (en) | An arrangement for controlling switching transistors | |
GB874667A (en) | Improvements in or relating to passive electronic switches | |
GB1031463A (en) | Overload protection circuits | |
GB994514A (en) | Improvements in or relating to bistable electrical circuits | |
GB928814A (en) | Improvements relating to voltage stabiliser circuits | |
GB1099375A (en) | Electrically-controlled switching circuit | |
GB811091A (en) | Improvements in or relating to bistable trigger circuits | |
GB1240760A (en) | Switching arrangements for alternating current |