GB1220955A – Protection circuit
– Google Patents
GB1220955A – Protection circuit
– Google Patents
Protection circuit
Info
Publication number
GB1220955A
GB1220955A
GB27957/68A
GB2795768A
GB1220955A
GB 1220955 A
GB1220955 A
GB 1220955A
GB 27957/68 A
GB27957/68 A
GB 27957/68A
GB 2795768 A
GB2795768 A
GB 2795768A
GB 1220955 A
GB1220955 A
GB 1220955A
Authority
GB
United Kingdom
Prior art keywords
restoring
diodes
potential
colour
june
Prior art date
1967-06-12
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
GB27957/68A
Inventor
Allen Leroy Limberg
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.)
RCA Corp
Original Assignee
RCA Corp
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.)
1967-06-12
Filing date
1968-06-12
Publication date
1971-01-27
1968-06-12
Application filed by RCA Corp
filed
Critical
RCA Corp
1971-01-27
Publication of GB1220955A
publication
Critical
patent/GB1220955A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
H04N3/20—Prevention of damage to cathode-ray tubes in the event of failure of scanning
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
H04N3/18—Generation of supply voltages, in combination with electron beam deflecting
H04N3/185—Maintaining dc voltage constant
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N5/00—Details of television systems
H04N5/14—Picture signal circuitry for video frequency region
H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of «clamp» circuit operated by switching circuit
H04N5/185—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of «clamp» circuit operated by switching circuit for the black level
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N9/00—Details of colour television systems
H04N9/64—Circuits for processing colour signals
H04N9/72—Circuits for processing colour signals for reinsertion of DC and slowly varying components of colour signals
Abstract
1,220,955. Video amplifiers; colour television receiver. R.C.A. CORPORATION. 12 June, 1968 [12 June, 1967], No. 27957/68. Headings H3T and H4F. Video amplifiers (e.g. transistors 36, 38, 40) which are A.C. coupled at 66, 68, 70 to the grids 60, 62, 64 of the tube 10 of a T.V. receiver and which have associated D.C. restoring diodes 76, 78, 80 arranged to conduct during retrace intervals, also have a protection circuit incorporating a further diode 102 which is connected between the restoring diodes and a potential source 88 and which is reverse biased by the source 88 during normal receiver operation. Each transistor 36, 38, 40 amplifies either a colour signal or a colour difference signal, the luminance signal in the latter case being applied to cathodes 16, 18, 20. A transistor switch 90 is turned on by line retrace signals 96 to earth collector 90 whereby the potential defined by a divider 84, 86 forward biases the restoring diodes 76, 78, 80 to discharge the capacitors 66, 68, 70 to the defined potential. If arc-over occurs in the tube 10 from high voltage to a grid 60, 62, 64, the protective diode 102 is forward biased and the arc-over surge current is discharged into the supply capacitor 104, thus protecting the transistors 36, 38, 40 from damage.
GB27957/68A
1967-06-12
1968-06-12
Protection circuit
Expired
GB1220955A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US64535467A
1967-06-12
1967-06-12
Publications (1)
Publication Number
Publication Date
GB1220955A
true
GB1220955A
(en)
1971-01-27
Family
ID=24588667
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB27957/68A
Expired
GB1220955A
(en)
1967-06-12
1968-06-12
Protection circuit
Country Status (10)
Country
Link
US
(1)
US3535436A
(en)
AT
(1)
AT279689B
(en)
BE
(1)
BE716461A
(en)
DE
(1)
DE1762416B2
(en)
ES
(1)
ES354861A1
(en)
FR
(1)
FR1568596A
(en)
GB
(1)
GB1220955A
(en)
MY
(1)
MY7300380A
(en)
NL
(1)
NL160696C
(en)
SE
(1)
SE350172B
(en)
Families Citing this family (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3647944A
(en)
*
1969-08-25
1972-03-07
Rca Corp
Kinescope bias arrangement to provide both constant amplitude dc restoration pulses and arc discharge protection
US4178610A
(en)
*
1978-02-17
1979-12-11
Gte Sylvania Incorporated
Clamp circuit for RGB output stages
US4870529A
(en)
*
1986-10-31
1989-09-26
Displaytek, Inc.
Active arc protection circuit
Family Cites Families (5)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
USRE25284E
(en)
*
1954-08-04
1962-11-06
D loughlin
US2938073A
(en)
*
1955-10-19
1960-05-24
Rca Corp
Color television
US2938946A
(en)
*
1956-12-20
1960-05-31
Rca Corp
Color processing system
GB933935A
(en)
*
1960-12-09
1963-08-14
Gen Electric Co Ltd
Improvements in or relating to colour television apparatus
NL285640A
(en)
*
1961-11-20
1967
1967-06-12
US
US645354A
patent/US3535436A/en
not_active
Expired – Lifetime
1968
1968-04-22
SE
SE05359/68A
patent/SE350172B/xx
unknown
1968-06-10
ES
ES354861A
patent/ES354861A1/en
not_active
Expired
1968-06-11
FR
FR1568596D
patent/FR1568596A/fr
not_active
Expired
1968-06-11
NL
NL6808185.A
patent/NL160696C/en
not_active
IP Right Cessation
1968-06-12
BE
BE716461D
patent/BE716461A/xx
unknown
1968-06-12
DE
DE19681762416
patent/DE1762416B2/en
not_active
Withdrawn
1968-06-12
AT
AT565568A
patent/AT279689B/en
active
1968-06-12
GB
GB27957/68A
patent/GB1220955A/en
not_active
Expired
1973
1973-12-30
MY
MY380/73A
patent/MY7300380A/en
unknown
Also Published As
Publication number
Publication date
AT279689B
(en)
1970-03-10
NL160696C
(en)
1979-11-15
ES354861A1
(en)
1969-11-16
NL6808185A
(en)
1968-12-13
FR1568596A
(en)
1969-05-23
MY7300380A
(en)
1973-12-31
DE1762416A1
(en)
1971-05-27
BE716461A
(en)
1968-11-04
US3535436A
(en)
1970-10-20
DE1762416B2
(en)
1971-09-30
NL160696B
(en)
1979-06-15
SE350172B
(en)
1972-10-16
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None