GB886008A - Electro-magnetic relay circuits - Google Patents

Electro-magnetic relay circuits

Info

Publication number
GB886008A
GB886008A GB3039059A GB3039059A GB886008A GB 886008 A GB886008 A GB 886008A GB 3039059 A GB3039059 A GB 3039059A GB 3039059 A GB3039059 A GB 3039059A GB 886008 A GB886008 A GB 886008A
Authority
GB
United Kingdom
Prior art keywords
resistor
relay
diode
voltage
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
GB3039059A
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.)
LEGG IND Ltd
Original Assignee
LEGG IND 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 LEGG IND Ltd filed Critical LEGG IND Ltd
Priority to GB3039059A priority Critical patent/GB886008A/en
Publication of GB886008A publication Critical patent/GB886008A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03K17/64—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 having inductive loads

Landscapes

  • Relay Circuits (AREA)

Abstract

886,008. Protective arrangements. LEGG (INDUSTRIES) Ltd., and ROCK, A. Aug. 16, 1960 [Sept. 5, 1959], No. 30390/59. Class 38 (5). [Also in Group XL (c)] In an electromagnetic relay circuit a relay R is energized through the emitter-collector circuit of a transistor T which is caused to conduct by a voltage applied to its base, the latter being connected to the junction between a zener diode Z<SP>1</SP> and resistor r<SP>3</SP>; the diode being connected to a tapping point of a potential divider r<SP>1</SP>, r<SP>2</SP> across the supply voltage and through the resistor r<SP>3</SP> to the positive supply line. When the supply voltage increases, the reverse voltage across the diode s1 increases until the critical voltage of the latter is reached and the diode conducts so that the resulting potential across the resistor r<SP>3</SP> causes the transistor to conduct and the relay to operate. A series dropper resistor r<SP>4</SP> may be used if the supply voltage is in excess of the voltage rating of the components. Additional protection, Fig. 3, may be obtained by providing the relay R with auxiliary contacts C1, C2 and resistor r<SP>5</SP> so that when the relay operates the transistor T is cut out of the circuit and the supply to the zener diode Z<SP>1</SP> is interrupted. Alternatively, a further zener diode, Fig. 4 (not shown), may be connected across part of the resistor r<SP>1</SP> so as to stabilize the supply to the first diode Z<SP>1</SP>. A rectifier or capacitor may be connected across the relay operating coil.
GB3039059A 1959-09-05 1959-09-05 Electro-magnetic relay circuits Expired GB886008A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3039059A GB886008A (en) 1959-09-05 1959-09-05 Electro-magnetic relay circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3039059A GB886008A (en) 1959-09-05 1959-09-05 Electro-magnetic relay circuits

Publications (1)

Publication Number Publication Date
GB886008A true GB886008A (en) 1962-01-03

Family

ID=10306913

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3039059A Expired GB886008A (en) 1959-09-05 1959-09-05 Electro-magnetic relay circuits

Country Status (1)

Country Link
GB (1) GB886008A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225911A (en) * 1988-11-29 1990-06-13 Toshiba Kk Relay drive circuit regulates voltage across relay coil
GB2273010A (en) * 1992-11-30 1994-06-01 Fujitsu Ltd Current-controlled relay operating circuit with precise switching point

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225911A (en) * 1988-11-29 1990-06-13 Toshiba Kk Relay drive circuit regulates voltage across relay coil
GB2225911B (en) * 1988-11-29 1992-09-16 Toshiba Kk Relay drive circuit
GB2273010A (en) * 1992-11-30 1994-06-01 Fujitsu Ltd Current-controlled relay operating circuit with precise switching point
US5590013A (en) * 1992-11-30 1996-12-31 Fujitsu Limited Electric-supply-switch relay-circuit

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