UST957008I4 - Switching circuit with accurate current threshold - Google Patents

Switching circuit with accurate current threshold Download PDF

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Publication number
UST957008I4
UST957008I4 US05/676,195 US67619576A UST957008I4 US T957008 I4 UST957008 I4 US T957008I4 US 67619576 A US67619576 A US 67619576A US T957008 I4 UST957008 I4 US T957008I4
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US
United States
Prior art keywords
switching circuit
current threshold
accurate current
switch
threshold value
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
US05/676,195
Inventor
Abel Ching Nam Sheng
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Priority to US05/676,195 priority Critical patent/UST957008I4/en
Application granted granted Critical
Publication of UST957008I4 publication Critical patent/UST957008I4/en
Expired legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/30—Modifications for providing a predetermined threshold before switching
    • H03K17/305—Modifications for providing a predetermined threshold before switching in thyristor switches

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Conversion In General (AREA)

Abstract

a threshold current gate provides a diversion path for substantially all input current lower than a threshold value applied to the trigger electrode of a switch, such as a semiconductor controlled rectifier (SCR), thereby inhibiting switch triggering. When the input current exceeds the threshold value, that portion which exceeds the same flows into and triggers the switch.
US05/676,195 1976-04-12 1976-04-12 Switching circuit with accurate current threshold Expired UST957008I4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US05/676,195 UST957008I4 (en) 1976-04-12 1976-04-12 Switching circuit with accurate current threshold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/676,195 UST957008I4 (en) 1976-04-12 1976-04-12 Switching circuit with accurate current threshold

Publications (1)

Publication Number Publication Date
UST957008I4 true UST957008I4 (en) 1977-04-05

Family

ID=24713597

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/676,195 Expired UST957008I4 (en) 1976-04-12 1976-04-12 Switching circuit with accurate current threshold

Country Status (1)

Country Link
US (1) UST957008I4 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980001347A1 (en) * 1978-12-20 1980-06-26 Western Electric Co Control circuitry for gated diode switches
US5313115A (en) * 1990-11-19 1994-05-17 Canon Kabushiki Kaisha Comparator
US5617046A (en) * 1993-11-29 1997-04-01 Sgs-Thomson Microelectronics, S.R.L. Generation of a diagnostic signal when the current through a power transistor reaches a level close to a limit current

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980001347A1 (en) * 1978-12-20 1980-06-26 Western Electric Co Control circuitry for gated diode switches
US5313115A (en) * 1990-11-19 1994-05-17 Canon Kabushiki Kaisha Comparator
US5617046A (en) * 1993-11-29 1997-04-01 Sgs-Thomson Microelectronics, S.R.L. Generation of a diagnostic signal when the current through a power transistor reaches a level close to a limit current

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