GB1313513A - Circuits for deflection coils of cathode ray tubes - Google Patents

Circuits for deflection coils of cathode ray tubes

Info

Publication number
GB1313513A
GB1313513A GB1313513DA GB1313513A GB 1313513 A GB1313513 A GB 1313513A GB 1313513D A GB1313513D A GB 1313513DA GB 1313513 A GB1313513 A GB 1313513A
Authority
GB
United Kingdom
Prior art keywords
coil
transistor
diode
voltage source
deflection
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
Application number
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.)
Decca Ltd
Original Assignee
Decca 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.)
Filing date
Publication date
Application filed by Decca Ltd filed Critical Decca Ltd
Publication of GB1313513A publication Critical patent/GB1313513A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K6/00—Manipulating pulses having a finite slope and not covered by one of the other main groups of this subclass
    • H03K6/02—Amplifying pulses
    • 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

Landscapes

  • Details Of Television Scanning (AREA)

Abstract

1313513 Transistor deflection current generator DECCA Ltd 1 May 1970 [9 June 1969] 29109/69 Heading H3T Deflection current for a cathode-ray tube deflection coil 10 is provided by a circuit comprising a feedback resistor 14 in series with the coil, a transistor 15 and a diode 16 connecting the coil to a first voltage source 17 and a switch 30 responsive to the voltage across the coil to connect the junction of the transistor and diode to a higher voltage source. So long as a steady current is required by the coil it is supplied by the low voltage source but when an increase is required in response to the input at 13 the resulting increase in voltage across the coil is fed through a capacitor 37 to the base of transistor 30 to connect the coil to the higher voltage source. Diode 25 prevents excessive voltage across the coil and diode 33 protects transistor 30 and provides a threshold such that small changes in coil current do not switch on transistor 30. Base bias may provide a further increase in threshold. Transistor 30 may be replaced by a complementary Darlington pair with a protecting diode connected to the first of the pair (Fig. 2, not shown). A second circuit 11, 19 &c. provides for push-pull deflection.
GB1313513D 1969-06-09 1969-06-09 Circuits for deflection coils of cathode ray tubes Expired GB1313513A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2910969 1969-06-09

Publications (1)

Publication Number Publication Date
GB1313513A true GB1313513A (en) 1973-04-11

Family

ID=10286311

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1313513D Expired GB1313513A (en) 1969-06-09 1969-06-09 Circuits for deflection coils of cathode ray tubes

Country Status (1)

Country Link
GB (1) GB1313513A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120884A (en) * 1982-05-10 1983-12-07 Diasonics Nmr Inc Gradient power supply

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120884A (en) * 1982-05-10 1983-12-07 Diasonics Nmr Inc Gradient power supply

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee