GB1228643A - - Google Patents
Info
- Publication number
- GB1228643A GB1228643A GB1228643DA GB1228643A GB 1228643 A GB1228643 A GB 1228643A GB 1228643D A GB1228643D A GB 1228643DA GB 1228643 A GB1228643 A GB 1228643A
- Authority
- GB
- United Kingdom
- Prior art keywords
- turns
- voltage
- zener diode
- resistor
- supply
- 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
- 239000003990 capacitor Substances 0.000 abstract 4
- 230000007257 malfunction Effects 0.000 abstract 2
- 230000004044 response Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/04—Arrangements for preventing response to transient abnormal conditions, e.g. to lightning or to short duration over voltage or oscillations; Damping the influence of DC component by short circuits in AC networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/006—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of too high or too low voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/247—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage having timing means
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
1,228,643. Logic circuits. COMPAGNIE DES COMPTEURS. 23 May, 1968 [1 June, 1967], No. 24631/68. Heading H3T. Logic apparatus liable to malfunction in response to excessively low bias voltage has a threshold and output circuit 2-8 and 15-20 responsive to values of the bias supply below the threshold for providing a control signal to prevent malfunction of the logic apparatus and the control signal is maintained for an interval following increase of the supply above the threshold value by a delay means 12, 14. As shown, the logic apparatus which may be monostable, bistable or memory circuits, is connected to bias supply 100, 101 and is controlled via one or more outputs S 1 , S 2 . The output So may be connected to the base of an output transistor of a logic circuit. With the input supply at its normal value Ua, Zener diodes 15 and 2 and transistors 18 and 5 are on and transistors 20 and 7 are off, so that no control output is given at S 1 , S 2 . When the input voltage Ua (Fig. 4, not shown) falls below Un, Zener diode 15 turns off. This turns transistors 18 and 5 off and 20, 7 on, so that a control input is fed via diodes D 1 , D 2 to the logic circuits which are held in a determined state such as to lock, delay or set them in a preferred state in the case of monostable or bistable circuits or to block a memory. Zener diode 2 remains on until the voltage Va falls below Vn after a delay determined by the capacitor 14 and resistor 12. When the input. supply Ua is again increased above the value Un Zener diode 15 turns on as does transistor 18 and transistor 20 turns off. Transistor 5 does not turn on until the voltage Va has increased above Vn (at time t 2 ) when Zener diode 2 turns on. Then transistor 7 turns off and the control signal to the logic circuit at S 1 , S 2 is removed. The capacitor 14 and resistor 12 delay the rate of increase of the voltage Va. A Zener diode 13 regulates the supply Va. In an alternative embodiment (Fig. 1, not shown), using only circuit section B of Fig. 2 a diode (10) and capacitor (9) shunt the resistor 3 and Zener diode 2, resistor 4 so as to provide delay in removing the control signal at S 1 , S 2 but the diode (10) and a resistor (11) allow rapid discharge of the capacitor (9) when the voltage Va falls below Vn.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR108706A FR1532593A (en) | 1967-06-01 | 1967-06-01 | Improvements to inhibition circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1228643A true GB1228643A (en) | 1971-04-15 |
Family
ID=8632096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1228643D Expired GB1228643A (en) | 1967-06-01 | 1968-05-23 |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH500608A (en) |
| FR (1) | FR1532593A (en) |
| GB (1) | GB1228643A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3651470A (en) * | 1970-06-08 | 1972-03-21 | Bell Telephone Labor Inc | Integrated level detector circuit with gating arrangement to inhibit transient output signals in response to energization of the circuit |
| CA976614A (en) * | 1972-10-26 | 1975-10-21 | Canadian General Electric Company Limited | Inhibited power supplies |
-
1967
- 1967-06-01 FR FR108706A patent/FR1532593A/en not_active Expired
-
1968
- 1968-05-23 GB GB1228643D patent/GB1228643A/en not_active Expired
- 1968-05-31 CH CH812368A patent/CH500608A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR1532593A (en) | 1968-07-12 |
| CH500608A (en) | 1970-12-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |