GB939457A - Timing delay and reset circuit - Google Patents
Timing delay and reset circuitInfo
- Publication number
- GB939457A GB939457A GB2288762A GB2288762A GB939457A GB 939457 A GB939457 A GB 939457A GB 2288762 A GB2288762 A GB 2288762A GB 2288762 A GB2288762 A GB 2288762A GB 939457 A GB939457 A GB 939457A
- Authority
- GB
- United Kingdom
- Prior art keywords
- point
- circuit
- diode
- switch
- time
- 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
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/18—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for introducing delay in the operation of the relay
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/08—Indicating faults in circuits or apparatus
- H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Electronic Switches (AREA)
Abstract
939,457. Time delay and reset switching systems. NORTHERN ELECTRIC CO. Ltd. June 14, 1962, No. 22887/62. Class 38 (4). [Also in Group XL (c)] A current responsive device 3 is provided with a time-delayed operation and a rapid reset by a circuit arrangement in which, upon closure of a switch 11, a capacitor 2 is charged through resistors 1, 12 and diode 5 and, after a predetermined time interval controlled by adjustment of the resistor 1, the potential of the circuit point e reaches the value required for operation of the device 3. During closure of the switch 11, the circuit point 14 is positive with respect to the point 13 and hence a transistor 7 is cut off. When the switch 11 is opened the point 14 falls below the potential of point 13 which causes the transistor 7 to conduct and the capacitor 2 to discharge through a resistor 8. At the same time a diode 6 arrests the negative voltage swing due to the inductance of the device control coil 4, the time constant of the circuit including members 4 and 6 being made equal to or greater than that of the circuit including members 2, 7 and 8, so that the diode 5 is reverse biased during the discharge of the timing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2288762A GB939457A (en) | 1962-06-14 | 1962-06-14 | Timing delay and reset circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2288762A GB939457A (en) | 1962-06-14 | 1962-06-14 | Timing delay and reset circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB939457A true GB939457A (en) | 1963-10-16 |
Family
ID=10186661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2288762A Expired GB939457A (en) | 1962-06-14 | 1962-06-14 | Timing delay and reset circuit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB939457A (en) |
-
1962
- 1962-06-14 GB GB2288762A patent/GB939457A/en not_active Expired
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