GB1238449A - - Google Patents

Info

Publication number
GB1238449A
GB1238449A GB1238449DA GB1238449A GB 1238449 A GB1238449 A GB 1238449A GB 1238449D A GB1238449D A GB 1238449DA GB 1238449 A GB1238449 A GB 1238449A
Authority
GB
United Kingdom
Prior art keywords
stable
winding
current
core
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
Application number
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 filed Critical
Publication of GB1238449A publication Critical patent/GB1238449A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
    • H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
    • H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H03K17/68—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors specially adapted for switching ac currents or voltages

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electronic Switches (AREA)

Abstract

1,238,449. Transistor bi-stable circuits. SIEMENS A.G. 14 July, 1969 [15 July, 1968], No. 35305/69. Heading H3T. A bi-stable, such as a complementary pair of transistors 5, 10, has a single magnetic core 2 with only two windings of which a first 21 carries a steady current from the supply, and a second 22 carries a current when the bi-stable is in one state to produce a flux opposing that due to the first winding and carries no current when the bi-stable is in the other state, whereby the bistable always resumes after a power failure that state which it had before. The transistors, being normally off, are turned on by a signal at T5 base 6, whereupon T5 saturates and T10 assumes an amplifying mode to transmit a signal from a transformer 11 to an output 15. The current in winding 22 is twice that in winding 21 so that the magnetization of the core 2 is reversed. If the power supply is turned off then upon subsequently turning on again, a current flows in winding 21 which changes back the magnetization of core 2, this causing a pulse to be generated in winding 22 which turns on T5, T10. Thus the original state is resumed, and the core is remagnetized once more by the bistable current. If the bistable had not been conductive when the power supply stopped, then the core would have been magnetized already in the direction appropriate to the winding 21 current upon switch on, and no more than a spurious pulse would appear in winding 22, this being prevented from turning on the bi-stable by a capacitor 8. Means are provided to ensure that turn-on of the supply is rapid enough to ensure correct core response. The transformer 11 may supply more than one bi-stable from the same secondary or from respective secondaries, and more than one bi-stable may supply the same output 15 at a common emitter resistor 14. The transformer 11 and diode 12 may be replaced by a capacitor input. A second transistor may supplement T10 to enable A.C. signals symmetrical about earth to be gated; and a plurality of the bi-stable switches may be arranged in a crossbar switching bank or in a matrix. T5 may be a thyristor.
GB1238449D 1968-07-15 1969-07-14 Expired GB1238449A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1056768A CH493967A (en) 1968-07-15 1968-07-15 Circuit arrangement with bistable behavior

Publications (1)

Publication Number Publication Date
GB1238449A true GB1238449A (en) 1971-07-07

Family

ID=4364566

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1238449D Expired GB1238449A (en) 1968-07-15 1969-07-14

Country Status (5)

Country Link
CH (1) CH493967A (en)
DE (1) DE1923799A1 (en)
GB (1) GB1238449A (en)
NL (1) NL148209B (en)
NO (1) NO124900B (en)

Also Published As

Publication number Publication date
DE1923799B2 (en) 1970-12-03
DE1923799A1 (en) 1970-02-05
NO124900B (en) 1972-06-19
NL6910076A (en) 1970-01-19
CH493967A (en) 1970-07-15
NL148209B (en) 1975-12-15

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Legal Events

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