GB1525701A - Electronic switching circuits - Google Patents

Electronic switching circuits

Info

Publication number
GB1525701A
GB1525701A GB32075A GB32075A GB1525701A GB 1525701 A GB1525701 A GB 1525701A GB 32075 A GB32075 A GB 32075A GB 32075 A GB32075 A GB 32075A GB 1525701 A GB1525701 A GB 1525701A
Authority
GB
United Kingdom
Prior art keywords
supply
transistor
load
circuit
control signal
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
GB32075A
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB32075A priority Critical patent/GB1525701A/en
Priority to US05/645,617 priority patent/US4021683A/en
Publication of GB1525701A publication Critical patent/GB1525701A/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
    • H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
    • H03K17/79—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar semiconductor switches with more than two PN-junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/13—Modifications for switching at zero crossing
    • H03K17/136—Modifications for switching at zero crossing in thyristor switches

Landscapes

  • Rectifiers (AREA)

Abstract

1525701 Switching circuits for A.C. loads NATIONAL RESEARCH DEVELOPMENT CORP 31 Dec 1975 [3 Jan 1975 23 June 1975] 320/75 and 26623/75 Heading H2H A switching circuit for controlling the supply of A.C. to a load 2 comprises a bi-directional rectifier combination 3, 4 the trigger electrodes of which are connected via respective transistor 10, 12 to D.C. trigger voltage supplies DCV1, DCV2, and a control circuit for causing the simultaneous conduction of the transistors when the next zero voltage instant of the A.C. supply occurs after the supply of a control signal to the control circuit. When a control signal is supplied to terminals 29, 30. a transistor 32 is switched on by an opto-electronic isolator 25. A transistor 22 does not conduct until the output of a bridge rectifier 17-20 falls to zero whereupon the transistor 22 switches on a transistor 27 to energize opto-electronic isolators 13, 15. The transistors 10, 12 are therefore switched on to supply trigger voltages to the thyristors 3, 4, each of which is rendered conductive during alternate half cycles to supply power from a source 1 to the load 2. Removal of the control signal from the terminals 29, 30 switches off the load at the next zero crossing of the supply. A circuit for switching off the load if one of the thyristors becomes open circuit is also described.
GB32075A 1975-01-03 1975-01-03 Electronic switching circuits Expired GB1525701A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB32075A GB1525701A (en) 1975-01-03 1975-01-03 Electronic switching circuits
US05/645,617 US4021683A (en) 1975-01-03 1975-12-31 Electronic switching circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB32075A GB1525701A (en) 1975-01-03 1975-01-03 Electronic switching circuits

Publications (1)

Publication Number Publication Date
GB1525701A true GB1525701A (en) 1978-09-20

Family

ID=9702312

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32075A Expired GB1525701A (en) 1975-01-03 1975-01-03 Electronic switching circuits

Country Status (1)

Country Link
GB (1) GB1525701A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2238674A (en) * 1989-10-10 1991-06-05 Teledyne Ind Control circuit for scr ac relay.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2238674A (en) * 1989-10-10 1991-06-05 Teledyne Ind Control circuit for scr ac relay.
GB2238674B (en) * 1989-10-10 1994-03-16 Teledyne Ind Improved zero voltage switching AC relay circuit

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Legal Events

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