GB1381379A – Reed relay memory circuit for bistable transistor circuit
– Google Patents
GB1381379A – Reed relay memory circuit for bistable transistor circuit
– Google Patents
Reed relay memory circuit for bistable transistor circuit
Info
Publication number
GB1381379A
GB1381379A
GB4152672A
GB4152672A
GB1381379A
GB 1381379 A
GB1381379 A
GB 1381379A
GB 4152672 A
GB4152672 A
GB 4152672A
GB 4152672 A
GB4152672 A
GB 4152672A
GB 1381379 A
GB1381379 A
GB 1381379A
Authority
GB
United Kingdom
Prior art keywords
supply
circuit
contact
relay
reed relay
Prior art date
1971-09-27
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
Application number
GB4152672A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schneider Electric USA Inc
Original Assignee
Square D Co
Priority date (The priority date 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 date listed.)
1971-09-27
Filing date
1972-09-07
Publication date
1975-01-22
1972-09-07
Application filed by Square D Co
filed
Critical
Square D Co
1975-01-22
Publication of GB1381379A
publication
Critical
patent/GB1381379A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03K—PULSE TECHNIQUE
H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
H03K17/24—Storing the actual state when the supply voltage fails
Abstract
1381379 Power failure protection SQUARE D CO 7 Sept 1972 [27 Sept 1971] 41526/72 Heading G4A [Also in Division H3] A bi-stable transistor logic circuit has an associated latching type reed relay which if the supply fails is set while it is failing and restores the bi-stable circuit to its original state when the supply is being restored. The circuit may also provide a signal while the supply is failing and being restored and this may be used to prevent false operation of a counter, shift register or logic system of which the circuit forms part. The bi-stable circuit shown comprises cross-coupled NOR gates 28 a , 30 a . When the A.C. 20 fails a relay PC releases. Contact 70 closes to apply the decaying supply voltage to the base of a transistor 66, the collect of which applies a 0 level to one input of the bi-stable circuit via contact 60 of a reed relay 40. This does not change the state of the circuit. Contact 72 of the relay PC operates a further relay NC via transistor 68. Contact 78 completes the circuit of the reed relay coils 50, 52 so that it is switched by transistors 46, 48 to correspond with the bi-stable circuit and hold the state during the supply failure. Switching of the reed relay does not take place during normal operation. When the supply falls below the threshold value of a Zener diode 76, transistor 68 goes off, releasing relay NC so that its contact 72 disconnects the reed relay coil. When the supply is restored a negative signal is produced on lead 26 until the supply reaches – 12 V. This, via transistors 64 and 66, applies a Fig. 1 signal to contact 60 of the reed relay to restore the bi-stable circuit to its previous state. Above- 12 V transistor 64 goes off and contact 70 is opened so that the reed relay contact receives a 0 signal allowing the bi-stable circuit to be switched normally. At – 12 V the Zener diode current turns transistor 68 on again and relay NC is not operated as contact 72 is open. During the fourth part of the decay and restoration of the supply a terminal 88 is connected by resistor to the supply to provide a failure indication.
GB4152672A
1971-09-27
1972-09-07
Reed relay memory circuit for bistable transistor circuit
Expired
GB1381379A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US18378171A
1971-09-27
1971-09-27
Publications (1)
Publication Number
Publication Date
GB1381379A
true
GB1381379A
(en)
1975-01-22
Family
ID=22674253
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4152672A
Expired
GB1381379A
(en)
1971-09-27
1972-09-07
Reed relay memory circuit for bistable transistor circuit
Country Status (6)
Country
Link
US
(1)
US3723767A
(en)
CA
(1)
CA979081A
(en)
DE
(1)
DE2246312C3
(en)
FR
(1)
FR2155340A5
(en)
GB
(1)
GB1381379A
(en)
IT
(1)
IT975090B
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2191613A
(en)
*
1986-05-01
1987-12-16
Hitachi Ltd
Data protection apparatus
Families Citing this family (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2215158A5
(en)
*
1972-12-22
1974-08-19
Alkan R & Cie
Family Cites Families (8)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2982870A
(en)
*
1961-05-02
Transistor
US3042900A
(en)
*
1959-10-29
1962-07-03
Gen Electric
Shift registers
NL289554A
(en)
*
1962-04-26
BE634319A
(en)
*
1962-11-21
US3158761A
(en)
*
1963-03-06
1964-11-24
Gen Electric
Logic circuit utilizing a latch type switching device as a permanent memory element
US3418646A
(en)
*
1964-08-27
1968-12-24
Army Usa
Transistor bistable devices with non-volatile memory
US3510689A
(en)
*
1966-11-01
1970-05-05
Massachusetts Inst Technology
Bistable flip-flop circuit with memory
US3597629A
(en)
*
1968-08-20
1971-08-03
Gulf & Western Industries
Temporary memory restore circuit for multivibrator
1971
1971-09-27
US
US00183781A
patent/US3723767A/en
not_active
Expired – Lifetime
1972
1972-07-24
CA
CA147,726A
patent/CA979081A/en
not_active
Expired
1972-09-07
GB
GB4152672A
patent/GB1381379A/en
not_active
Expired
1972-09-21
DE
DE2246312A
patent/DE2246312C3/en
not_active
Expired
1972-09-26
IT
IT70037/72A
patent/IT975090B/en
active
1972-09-26
FR
FR7233955A
patent/FR2155340A5/fr
not_active
Expired
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2191613A
(en)
*
1986-05-01
1987-12-16
Hitachi Ltd
Data protection apparatus
Also Published As
Publication number
Publication date
DE2246312B2
(en)
1975-04-03
DE2246312A1
(en)
1973-04-05
FR2155340A5
(en)
1973-05-18
IT975090B
(en)
1974-07-20
CA979081A
(en)
1975-12-02
DE2246312C3
(en)
1975-11-13
US3723767A
(en)
1973-03-27
Similar Documents
Publication
Publication Date
Title
US3795823A
(en)
1974-03-05
Signal detection in noisy transmission path
GB922053A
(en)
1963-03-27
Bistable flip-flop
GB1381379A
(en)
1975-01-22
Reed relay memory circuit for bistable transistor circuit
US3009070A
(en)
1961-11-14
Bi-directional current driver
GB1335856A
(en)
1973-10-31
Electronic memory with fault detection
US2913708A
(en)
1959-11-17
Magnetic core nondestructive readout circuit
GB1281029A
(en)
1972-07-12
Binary signal sensing circuit
GB1282668A
(en)
1972-07-19
A pulse regenerating circuit
US2942161A
(en)
1960-06-21
Clamping relay comparison circuit
GB866148A
(en)
1961-04-26
Improvements in or relating to switching circuits
US3303473A
(en)
1967-02-07
Adaptive logic circuits
GB978817A
(en)
1964-12-23
Electrical logic circuit including a reed relay
US3025501A
(en)
1962-03-13
Magnetic core logical systems
GB1270300A
(en)
1972-04-12
Arrangement responsive to a change of state of one or several two-state elements
US3602910A
(en)
1971-08-31
Core memory circuit
US3198955A
(en)
1965-08-03
Binary magnetic memory device
SU403049A1
(en)
1973-10-19
COVER VOLTAGE CONVERTER
GB1317554A
(en)
1973-05-23
Fault detection systems
US3631265A
(en)
1971-12-28
Conflicting signal error detector for process control system
GB1164811A
(en)
1969-09-24
Logic Memory Circuit
GB1358602A
(en)
1974-07-03
Checking circuit for determining the state of adc source
GB1186500A
(en)
1970-04-02
Improvements in Electrical Circuits
JPH03134928A
(en)
1991-06-07
Relay driving circuit
GB850732A
(en)
1960-10-05
Improvements in or relating to reversible magnetic shift register
GB1268800A
(en)
1972-03-29
Relay power supply
Legal Events
Date
Code
Title
Description
1975-06-04
PS
Patent sealed [section 19, patents act 1949]
1979-04-11
PCNP
Patent ceased through non-payment of renewal fee
