GB1397836A – Transistor circuit
– Google Patents
GB1397836A – Transistor circuit
– Google Patents
Transistor circuit
Info
Publication number
GB1397836A
GB1397836A
GB4734772A
GB4734772A
GB1397836A
GB 1397836 A
GB1397836 A
GB 1397836A
GB 4734772 A
GB4734772 A
GB 4734772A
GB 4734772 A
GB4734772 A
GB 4734772A
GB 1397836 A
GB1397836 A
GB 1397836A
Authority
GB
United Kingdom
Prior art keywords
transistor
diode
base
emitter
during
Prior art date
1971-10-16
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
GB4734772A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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.)
1971-10-16
Filing date
1972-10-13
Publication date
1975-06-18
1971-10-16
Priority claimed from DE19712151610
external-priority
patent/DE2151610B2/en
1972-04-12
Priority claimed from DE19722217451
external-priority
patent/DE2217451C3/en
1972-10-13
Application filed by Philips Electronic and Associated Industries Ltd
filed
Critical
Philips Electronic and Associated Industries Ltd
1975-06-18
Publication of GB1397836A
publication
Critical
patent/GB1397836A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03K—PULSE TECHNIQUE
H03K4/00—Generating pulses having essentially a finite slope or stepped portions
H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
H03K4/60—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor
H03K4/62—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor using a semiconductor device operating as a switching device
Abstract
1397836 Transistor switching circuits PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 13 Oct 1972 [16 Oct 1971 12 April 1972] 47347/72 Heading H3T In a circuit arrangement including a transistor 6 having means 1 for applying a switching signal between the base and emitter and a load impedance 7 connected to the collector of the transistor, a diode 12 is provided between the base and emitter, the conductivity direction of the diode is opposite to that of the baseemitter junction of the transistor and at least one impedance 13 is arranged in series with the diode 12 and by which impedance the diode is brought to the conducting state after a minimum delay time of 1 ÁS. As shown the output transistor 6 is part of a sawtooth generator such as a horizontal deflection generator in a T.V. A squarewave signal from an oscillator feeds the transformer 1 and the negative voltage part of this signal brings the transistor 6 to the non- conducting state when the flyback period is initiated. A half oscillation follows during the flyback period in the deflection circuit 7 and the collector-base diode of the transistor 6 conducts so that the transistor operates in the inverse anode during the first half of the scan period. After a delay of at least 1 ÁS provided by inductors 13 such as ferrite beads the diode 12 conducts to limit the voltage at the base of the transistor 6 during inverse operation to obviate high dissipation produced in the base-emitter diode of the transistor 6. The delay may alternatively be provided by a saturable inductor (14, Fig. 2, not shown). In a further modification an additional transistor (17, Fig. 3, not shown) is connected in series with the diode 12 and is controlled by a suitable switching voltage from an additional winding on the output transformer so as to be non-conducting during the switching off of the transistor 6 and conductive during the inverse operation of the transistor 6. In this arrangement the diode 12 may be omitted and the base-emitter junction of the additional transistor 17 then provides the diode action and the collector-base diode forms the impedance.
GB4734772A
1971-10-16
1972-10-13
Transistor circuit
Expired
GB1397836A
(en)
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
DE19712151610
DE2151610B2
(en)
1971-10-16
1971-10-16
Circuit arrangement with a high-voltage transistor
DE19722217451
DE2217451C3
(en)
1972-04-12
Circuit arrangement with a high-voltage transistor
Publications (1)
Publication Number
Publication Date
GB1397836A
true
GB1397836A
(en)
1975-06-18
Family
ID=25761888
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4734772A
Expired
GB1397836A
(en)
1971-10-16
1972-10-13
Transistor circuit
Country Status (4)
Country
Link
US
(1)
US3840755A
(en)
JP
(1)
JPS5345086B2
(en)
FR
(1)
FR2156328B1
(en)
GB
(1)
GB1397836A
(en)
Families Citing this family (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4005317A
(en)
*
1975-05-27
1977-01-25
Dressen-Barnes Electronics Corporation
Switching circuitry
NL7613894A
(en)
*
1976-12-15
1978-06-19
Philips Nv
SWITCHING GEAR FITTED WITH A HIGH-VOLTAGE POWER TRANSISTOR.
US5659259A
(en)
*
1996-04-12
1997-08-19
Hewlett-Packard Company
Circuit and method of sensing small voltage changes on highly capacitively loaded electronic signals
1972
1972-10-13
GB
GB4734772A
patent/GB1397836A/en
not_active
Expired
1972-10-13
US
US00297188A
patent/US3840755A/en
not_active
Expired – Lifetime
1972-10-13
JP
JP10198472A
patent/JPS5345086B2/ja
not_active
Expired
1972-10-13
FR
FR7236302A
patent/FR2156328B1/fr
not_active
Expired
Also Published As
Publication number
Publication date
US3840755A
(en)
1974-10-08
FR2156328A1
(en)
1973-05-25
JPS4848024A
(en)
1973-07-07
JPS5345086B2
(en)
1978-12-04
FR2156328B1
(en)
1979-02-23
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Legal Events
Date
Code
Title
Description
1975-10-29
PS
Patent sealed [section 19, patents act 1949]
1984-06-20
PCNP
Patent ceased through non-payment of renewal fee
