GB1513182A - Switching circuits - Google Patents

Switching circuits

Info

Publication number
GB1513182A
GB1513182A GB2925075A GB2925075A GB1513182A GB 1513182 A GB1513182 A GB 1513182A GB 2925075 A GB2925075 A GB 2925075A GB 2925075 A GB2925075 A GB 2925075A GB 1513182 A GB1513182 A GB 1513182A
Authority
GB
United Kingdom
Prior art keywords
pulse
turns
thyristor
phototransistor
terminals
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
GB2925075A
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.)
Infineon Technologies Americas Corp
Original Assignee
International Rectifier Corp USA
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 International Rectifier Corp USA filed Critical International Rectifier Corp USA
Priority to GB2925075A priority Critical patent/GB1513182A/en
Publication of GB1513182A publication Critical patent/GB1513182A/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
    • H03K17/795—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 transistors
    • H03K17/7955—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 transistors using phototransistors

Landscapes

  • Power Conversion In General (AREA)
  • Electronic Switches (AREA)

Abstract

1513182 Switching circuits INTERNATIONAL RECTIFIER CORP 11 July 1975 29250/75 Heading H3T A switching circuit comprises light emitters 20, 21 optically coupled to respective light-sensitive semiconductor devices, one, 23, being a phototransistor, coupled to a power transistor 30 in Darling- ton configuration, and the other 40 being either in parallel (as shown in Fig. 2) or in series, Fig. 1 (not shown), with 23. When a pulse is applied to terminals 10, 1 LED 20 turns on photothyristor 40, supplying base drive to power transistor 30, so that power may be supplied from a source connected to terminal 14 to a load connected to terminal 16. Thyristor 40, and hence 30, remain on after the end of the switch-on pulse. When a pulse is applied to terminals 12, 13, LED 21 turns on phototransistor 23, which shorts the drive to thyristor 40. If the pulse applied to 12, 13 is long enough thyristor 40 turns off. After the end of this pulse 23 turns off, turning off 30. The circuit may be integrated.
GB2925075A 1975-07-11 1975-07-11 Switching circuits Expired GB1513182A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2925075A GB1513182A (en) 1975-07-11 1975-07-11 Switching circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2925075A GB1513182A (en) 1975-07-11 1975-07-11 Switching circuits

Publications (1)

Publication Number Publication Date
GB1513182A true GB1513182A (en) 1978-06-07

Family

ID=10288538

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2925075A Expired GB1513182A (en) 1975-07-11 1975-07-11 Switching circuits

Country Status (1)

Country Link
GB (1) GB1513182A (en)

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Legal Events

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