[go: up one dir, main page]

WO2000064025A1 - Circuit protecteur pour composants actifs contre les surtensions ou sous-tensions - Google Patents

Circuit protecteur pour composants actifs contre les surtensions ou sous-tensions Download PDF

Info

Publication number
WO2000064025A1
WO2000064025A1 PCT/EP2000/002922 EP0002922W WO0064025A1 WO 2000064025 A1 WO2000064025 A1 WO 2000064025A1 EP 0002922 W EP0002922 W EP 0002922W WO 0064025 A1 WO0064025 A1 WO 0064025A1
Authority
WO
WIPO (PCT)
Prior art keywords
diode
series
resistor
protective
vss
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.)
Ceased
Application number
PCT/EP2000/002922
Other languages
German (de)
English (en)
Inventor
Gmbh Moeller
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.)
Eaton Industries GmbH
Original Assignee
Moeller GmbH
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 Moeller GmbH filed Critical Moeller GmbH
Priority to AU43976/00A priority Critical patent/AU4397600A/en
Publication of WO2000064025A1 publication Critical patent/WO2000064025A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers

Definitions

  • the invention relates to a protective circuit for active components against over or. Undervoltage, consisting of a limiting resistor arranged in series in front of the component input to be protected and one or, if necessary, one in each case between the connection point of the limiting resistor and component input on the one hand and the supply potential or the supply potentials on the other hand arranged in the reverse direction.
  • CMOS devices for example, mostly have ESD protection diodes at the input, so that in conjunction with an upstream limiting resistor, a simple limitation of the input current below a value specified in the data sheet is sufficient. It is more difficult and not uncommon if the component manufacturer only exceeds or falls below a maximum of the positive or negative supply voltage of 0.3 V.
  • the invention is therefore based on the object of specifying a simple and inexpensive protective circuit for such cases.
  • a reference potential is available at the connection point of the reference diode and series resistor, which is lower or higher than the higher or lower by the amount of forward voltage of the reference diode deeper supply potential.
  • the protective diode or the protective diodes are applied to this reference potential or these reference potentials, so that there is certainly effective protection of the input of the active component against impermissible overvoltages and undervoltage both in the entire temperature range and in a wide range of the limiting current.
  • the ratio between the resistance values of the series resistance and the limiting resistance should be selected so that, in the event of a limitation, the current flowing through the limiting resistance and the respective protective diode de electricity has no significant influence on the level of the associated reference potential.
  • the limitation takes place at the level of the respective supply potential.
  • an Si diode is used as the reference diode and a Schottky diode is used as the protection diode, in order to place the limiting potential below or above the higher or lower supply potential.
  • a shift in the limiting potential is achieved.
  • a cost-effective further development of the protective circuit according to the invention results from the fact that only a single series circuit comprising a series resistor and reference diode or reference diodes is provided to provide the reference potentials for a plurality of component inputs to be protected, each of which is connected in the manner described above with its limiting resistor and at least one protective diode.
  • FIG. 1 a first circuit arrangement with a first embodiment of the invention
  • FIG. 2 a second circuit arrangement with a further embodiment of the invention. Best way to carry out the invention
  • the circuit arrangement according to FIG. 1 shows an active component B1, for example an operational amplifier, which is connected to a protective circuit 1 according to the invention and is supplied by a higher supply potential Vdd (generally positive) and by a lower supply potential Vss (generally negative or ground).
  • Vdd generally positive
  • Vss generally negative or ground
  • This contains a series circuit comprising a first reference diode D1, a series resistor R1 and a second reference diode D2 between the supply voltages Vdd and Vss.
  • the reference diodes D1, D2 are poled in the forward direction.
  • the forward current Id flowing through the series circuit D1, R1, D2 generates at the connection points P1 and P2 of
  • first or second reference potential Vrefl or Vref2 a first or second reference potential Vrefl or Vref2.
  • the first reference potential Vref 1 is reduced by the amount of the forward voltage Vd1 of the first reference diode D1 compared to the higher supply potential Vdd.
  • the second reference potential Vref2 is increased by the amount of the forward voltage Vd2 of the second reference diode D2 compared to the lower supply potential Vss.
  • a limiting resistor Ri is arranged between the circuit input Ei and the signal input E1 of the component B1, which is to be designed to be significantly higher-resistance than the series resistor R1.
  • Limiting resistor Ri is connected to signal input E1, and a protective diode DM or Di2 is arranged at each of the first and second connection points P1 and P2.
  • the first protective diode Di1 lies with its cathode at the first connection point P1 having the higher reference potential Vrefl
  • the second protective diode Di2 lies with its anode at the second connection point P1 having the lower reference potential Vref2.
  • the protective diodes Di1 and Di2 are thus blocked in the non-limiting case and are permeable in the limiting case. Im limiting Trap the forward voltage Vdi1 or Vdi2 drops at the first or second protective diode Di1 or Di2.
  • the signal voltage Vs is limited to the range from Vsmin to Vsmax.
  • the upper limit for the signal voltage Vs is given as
  • the lower limit for the signal voltage Vs results as
  • Vsmax Vdd and for the lower limit
  • Vsmin Vss, i.e. there is no exceeding or falling short of the supply potentials Vdd and Vss.
  • Vsmin> Vss i.e. a safe limitation below or above the higher or lower supply potential Vdd or Vss.
  • the signal voltage Vs at the first component input E1 results from the input voltage Vi present at the circuit input Ei by multiplication by the division ratio of the resistance value one Leakage resistance R2 arranged between the connection point P3 and Ground and the sum of the resistance values of the limiting resistance Ri and the leakage resistance R2.
  • a voltage divider connected to the second component input E2 of the comparator B2, consisting of the series-connected divider resistors R3 and R4, with which the comparison voltage for the switching threshold of the signal voltage Vs is determined.
  • the forward current Id flowing through the series circuit R1, D2 generates a reference potential Vref2 at the connection point P2 of the series resistor R1 and the reference diode D2, which is higher than the lower supply potential Vss by the amount of the forward voltage Vd2 of the reference diode D2.
  • the limiting resistor Ri and the second protective diode D2 connected to it and on the anode side to the connection point P2 limit the signal voltage Vs to a lower limit Vsmin, which does not fall below the lower supply potential Vss.
  • the present invention is not limited to the embodiments described above, but also encompasses all embodiments having the same effect in the sense of the invention.
  • the invention can be modified in such a way that instead of a single reference diode D1 or D2, a series connection of several diodes polarized in the same direction is used or a Z-diode is used.
  • Another inexpensive modification is that a common series connection consists of Series resistor R1 and reference diode (s) D1, D2 are provided for a plurality of component inputs which are individually connected in the usual manner with limiting resistor and protective diode (s).
  • Vrefl Vref2 reference potential

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Semiconductor Integrated Circuits (AREA)

Abstract

Circuit protecteur pour composants actifs contre les surtensions ou sous-tensions, qui comporte une résistance de limitation (Ri) placée en série avant l'entrée (E1) du composant à protéger, ainsi qu'une diode de protection (Di1; Di2) placée dans le sens de non-conduction entre le point de liaison (P3) entre la résistance de limitation (Ri) et l'entrée (E1) du composant d'une part et les potentiels d'alimentation (Vdd; Vss) d'autre part. Une résistance en série (R1) et deux diodes de référence (D1; D2) sont montées en série entre les potentiels d'alimentation (Vdd; Vss). La diode de référence (D1; D2) est montée dans le sens de conduction entre le potentiel de référence (Vdd; Vss) et la résistance en série (R1). La valeur de résistance de la résistance en série (R1) est considérablement inférieure à celle de la résistance de limitation (Ri). La diode de protection (Di1; Di2) est reliée à son électrode éloignée de la résistance de limitation (Ri) par l'intermédiaire du point de liaison (P1; P2) entre la résistance en série (R1) et la diode de référence (D1; D2).
PCT/EP2000/002922 1999-04-14 2000-04-01 Circuit protecteur pour composants actifs contre les surtensions ou sous-tensions Ceased WO2000064025A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU43976/00A AU4397600A (en) 1999-04-14 2000-04-01 Schutzschaltung fur aktive bauelemente gegen uber- bzw. unterspannung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19916685.419990414 1999-04-14
DE1999116685 DE19916685A1 (de) 1999-04-14 1999-04-14 Schutzschaltung für aktive Bauelemente gegen Über- bzw. Unterspannung

Publications (1)

Publication Number Publication Date
WO2000064025A1 true WO2000064025A1 (fr) 2000-10-26

Family

ID=7904427

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/002922 Ceased WO2000064025A1 (fr) 1999-04-14 2000-04-01 Circuit protecteur pour composants actifs contre les surtensions ou sous-tensions

Country Status (3)

Country Link
AU (1) AU4397600A (fr)
DE (1) DE19916685A1 (fr)
WO (1) WO2000064025A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006053436A1 (de) * 2006-09-29 2008-04-03 Altis Semiconductor Schutzschaltung für eine elektrische Vorrichtung sowie Verfahren zum Schützen einer elektrischen Vorrichtung
WO2021184701A1 (fr) * 2020-03-18 2021-09-23 广州慧智微电子有限公司 Protection contre les surtensions et circuit d'amorçage de gain d'amplificateur de puissance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010032948A1 (de) * 2010-07-30 2012-02-02 Hottinger Baldwin Messtechnik Gmbh Schutzschaltung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4460935A (en) * 1982-06-18 1984-07-17 Fujitsu Ten Limited Input protecting circuit for a semiconductor circuit component

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4460935A (en) * 1982-06-18 1984-07-17 Fujitsu Ten Limited Input protecting circuit for a semiconductor circuit component

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006053436A1 (de) * 2006-09-29 2008-04-03 Altis Semiconductor Schutzschaltung für eine elektrische Vorrichtung sowie Verfahren zum Schützen einer elektrischen Vorrichtung
US7751163B2 (en) 2006-09-29 2010-07-06 Qimonda Ag Electric device protection circuit and method for protecting an electric device
WO2021184701A1 (fr) * 2020-03-18 2021-09-23 广州慧智微电子有限公司 Protection contre les surtensions et circuit d'amorçage de gain d'amplificateur de puissance

Also Published As

Publication number Publication date
AU4397600A (en) 2000-11-02
DE19916685A1 (de) 2000-10-19

Similar Documents

Publication Publication Date Title
DE1613860A1 (de) Schutzvorrichtung fuer mikroelektronische Komponenten
EP0769815A2 (fr) Configuration de circuit avec des moyens de protection
EP0689058B1 (fr) Circuit pour surveiller le point de déclenchement vis à vis d'une résistance de fuite
DE69614659T2 (de) Schaltung mit Überstromschutz für Leistungstransistoren
DE2836445C2 (de) Schaltungsanordnung zur Fehlererkennung in Digitalsignalen
DE2654419A1 (de) Schaltungsanordnung zur spannungsbegrenzung
WO2000064025A1 (fr) Circuit protecteur pour composants actifs contre les surtensions ou sous-tensions
DE3923710A1 (de) Stromversorgungseinrichtung mit gleichspannungsueberwachungsschaltung
DE69028031T2 (de) Überspannungsschutzschaltung für Fernmeldeleitungen
EP0753754A2 (fr) Circuit comparateur intégré
DE3707973C2 (fr)
EP0524425A1 (fr) Arrangement de circuit pour limiter le courant lors de la fermeture du circuit et pour la protection contre surtension pour dispositif d'alimentation à découpage
DE2855168A1 (de) Bipolarer spannungsdetektor
DE4011415C2 (fr)
DE19514806A1 (de) Stromdetektor
DE3739872C2 (fr)
DE1762472C3 (de) Überlastungsschutzschaltung für die Transistoren eines mit einer eisenlosen Gegentaktstufe versehenen Verstärkers
EP0358924A1 (fr) Appareil de commande avec un circuit pour sa protection en cas d'interruption de sa connexion de terre
DE3408167C2 (fr)
EP3503399B1 (fr) Circuit d'entrée numérique destiné à la réception des signaux d'entrée numériques d'un générateur de signaux
DE3537150A1 (de) Anordnung zum unterdruecken von ueberspannungsimpulsen
DE102018003592A1 (de) Digitalsignal-Ausgabevorrichtung
DE102019106641A1 (de) Schaltungsanordnung für einen Digitaleingang
DE1911959A1 (de) Triggerschaltung
DE102024107853A1 (de) Integrierte halbleiterschaltung

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK DM EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

WA Withdrawal of international application
121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642