GB1269681A - Semiconductor switching circuits - Google Patents

Semiconductor switching circuits

Info

Publication number
GB1269681A
GB1269681A GB1796269A GB1796269A GB1269681A GB 1269681 A GB1269681 A GB 1269681A GB 1796269 A GB1796269 A GB 1796269A GB 1796269 A GB1796269 A GB 1796269A GB 1269681 A GB1269681 A GB 1269681A
Authority
GB
United Kingdom
Prior art keywords
transformer
firing
pulses
resistor
oscillator
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
GB1796269A
Inventor
Peter Greenough Bartlett
Larry Keith Clark
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.)
EW Bliss Co Inc
Original Assignee
EW Bliss Co Inc
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 EW Bliss Co Inc filed Critical EW Bliss Co Inc
Publication of GB1269681A publication Critical patent/GB1269681A/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
    • H03K17/72—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 having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
    • H03K17/722—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 having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region with galvanic isolation between the control circuit and the output circuit
    • H03K17/723—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 having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region with galvanic isolation between the control circuit and the output circuit using transformer coupling

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

1,269,681. Bidirectional thyristor firing circuits. E. W. BLISS CO. 8 April, 1969 [16 April, 1968], No. 17962/69. Heading H3T. [Also in Division H2] A triac 40 or like monolithic A.C. switching device is fixed via a transformer 22 by pulses of frequency high relative to the A.C. supply, derived from a feedback type oscillator 10, the conventional gate current limiting resistor being omitted from the secondary circuit of the transformer. False firing due to increased leakage current at high temperatures may thus be reduced. As described the pulses are generated by a saturating transformer type blocking oscillator having a frequency controlling timing circuit 11, 21. The oscillator periodically discharges a capacitor 30 through the transformer primary winding to produce a short steep firing pulse. Resistor 32 limits the average firing current after the first few pulses and the effects of omitting the capacitor and resistor are described.
GB1796269A 1968-04-16 1969-04-08 Semiconductor switching circuits Expired GB1269681A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US73021268A 1968-04-16 1968-04-16

Publications (1)

Publication Number Publication Date
GB1269681A true GB1269681A (en) 1972-04-06

Family

ID=24934420

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1796269A Expired GB1269681A (en) 1968-04-16 1969-04-08 Semiconductor switching circuits

Country Status (1)

Country Link
GB (1) GB1269681A (en)

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