DE3937447A1 - PROTECTIVE DEVICE FOR FREQUENCY INVERTER - Google Patents

PROTECTIVE DEVICE FOR FREQUENCY INVERTER

Info

Publication number
DE3937447A1
DE3937447A1 DE19893937447 DE3937447A DE3937447A1 DE 3937447 A1 DE3937447 A1 DE 3937447A1 DE 19893937447 DE19893937447 DE 19893937447 DE 3937447 A DE3937447 A DE 3937447A DE 3937447 A1 DE3937447 A1 DE 3937447A1
Authority
DE
Germany
Prior art keywords
protection device
output signal
comparison element
characterized records
output
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.)
Withdrawn
Application number
DE19893937447
Other languages
German (de)
Inventor
Erfinder Wird Nachtraeglich Benannt Der
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.)
Hanning Elektro Werke GmbH and Co KG
Original Assignee
Hanning Elektro Werke GmbH and Co KG
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 Hanning Elektro Werke GmbH and Co KG filed Critical Hanning Elektro Werke GmbH and Co KG
Priority to DE19893937447 priority Critical patent/DE3937447A1/en
Priority to PCT/DE1990/000840 priority patent/WO1991007797A1/en
Publication of DE3937447A1 publication Critical patent/DE3937447A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H02H7/1227—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to abnormalities in the output circuit, e.g. short circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention concerns a protection device for detecting current overloads, earthing and short-circuiting in a switch-operation power actuator, in particular a frequency converter. In order that the power switches in the device can be switched off in the event of a current overload without the necessity for additional sensors such as current-measurement resistors with potential dividers, transformers, etc, the invention proposes that the target status of the power semiconductor be compared by a comparison element for equality with the actual output voltage and, if the two are not equal, an error signal triggered as the output signal.

Description

Die Erfindung betrifft eine Schutzeinrichtung zur Erfas­ sung von Überstrom, Erdschluß und Kurzschluß in einem schaltend arbeitenden Leistungssteller, vorwiegend Fre­ quenzumrichter, mit durch Überstrom abschaltenden Lei­ stungsschaltern.The invention relates to a protective device for detection solution of overcurrent, earth fault and short circuit in one switching power controller, mainly fre frequency converter, with Lei switching off due to overcurrent control switches.

Bei bekannten Geräten der vorgenannten Art werden zur Überwachung von Überlast und Störfällen, wie Erdschluß und Kurzschluß, Strommeßwiderstände mit Potentialtrennern, Stromwandler o. ä. eingesetzt. Solche zusätzlichen Senso­ ren stellen jedoch einen sich nachteilig auswirkenden beträchtlichen Aufwand dar.In known devices of the aforementioned type Monitoring of overload and accidents, such as earth faults and short circuit, current measuring resistors with potential isolators, Current transformers or similar used. Such additional senso However, ren represent an adverse effect considerable effort.

Aufgabe der Erfindung ist es nun, ohne die gemäß dem Stand der Technik verwendeten Strommeßeinrichtungen aus­ zukommen und damit eine sehr kostengünstige sowie über­ dies auch noch schneller wirkende Schutzeinrichtung ver­ fügbar zu machen.The object of the invention is now without the Current measuring devices used from to come and thus a very inexpensive as well  this also ver faster acting protective device to make available.

Die Lösung der gestellten Aufgabe geht aus den Ansprüchen sowie aus der folgenden Beschreibung eines nach der Er­ findung gestalteten Ausführungsbeispiels hervor.The solution to the task is based on the claims as well as from the following description one after the Er invention designed embodiment.

Die in der Zeichnung wiedergegebene Anordnung weist außer einer Gleichspannungsquelle 1 zwei mit den jeweils dazu­ gehörigen Ansteuerungen 2a und 3a versehene Leistungs­ schalter 2b und 3b auf. Hierbei erhält die Ansteuerelek­ tronik eine Überwachungsfunktion, die bei Überstrom die elektronischen Schalter außer Betrieb setzt, was durch UCE-Überwachung beim Bipolartransistor und IGBT- bzw. UDS-Überwachung beim MOS-Transistor erreicht werden kann. Der Ausgangszweig der dargestellten Halbbrücke ist mit der Last 7, wie z. B. einer Motorphase, verbunden.The arrangement shown in the drawing has, in addition to a DC voltage source 1, two power switches 2 b and 3 b provided with the respective controls 2 a and 3 a. Here, the control electronics receives a monitoring function that deactivates the electronic switches in the event of overcurrent, which can be achieved by UCE monitoring for the bipolar transistor and IGBT or UDS monitoring for the MOS transistor. The output branch of the half-bridge shown is with the load 7 , such as. B. a motor phase connected.

Erfindungsgemäß wird das Steuersignal für die elektroni­ schen Leistungsschalter 2b und 3b mit der Ausgangsspan­ nung auf Gleichheit untersucht. Hierzu wird die Ausgangs­ spannung über ein Übertragungselement 6 einem Vergleichs­ element 5 zugeführt. Als Übertragungselement 6 kommt ein Optokoppler, ein Transformator oder im einfachsten Fall ein Widerstand - z. B. als Spannungsteiler - in Frage. Bei Ungleichheit wird ein Fehlersignal 9 ausgelöst. According to the invention, the control signal for the electronic circuit breakers 2 b and 3 b is examined for equality with the output voltage. For this purpose, the output voltage is supplied to a comparison element 5 via a transmission element 6 . As a transmission element 6 comes an optocoupler, a transformer or in the simplest case a resistor - e.g. B. as a voltage divider - into question. In the event of inequality, an error signal 9 is triggered.

Um eine besonders einfache Kopplung zu einer potential­ freien Steuerlogik zu erreichen, kann gemäß Anspruch 4 das Übertragungselement 6 ein Kondensator mit in Reihe geschaltetem Widerstand sein. Durch Wahl kleiner Konden­ satoren und einem hochohmigen Widerstand in Reihe lassen sich auch Ableitungsströme erzielen, die unterhalb der zulässigen Grenzwerte liegen, ohne daß potentialtrennende Elemente benötigt werden.In order to achieve a particularly simple coupling to a potential-free control logic, the transmission element 6 can be a capacitor with a series-connected resistor. By selecting small capacitors and a high-resistance resistor in series, leakage currents can also be achieved which are below the permissible limit values without the need for electrically isolating elements.

Um Störmeldungen am Ausgang 10 des Vergleichselementes 5 zu unterdrücken, ist ein Filterelement 8 vorgesehen. Sol­ che Störungen können von den Schaltverzögerungen und Tot­ zeiten zwischen den Schaltern, die auch schon häufig in den Steuersignalen zur Ansteuerung der Leistungsschalter 2b und 3b vorhanden sind, herrühren. Durch das genannte Filterelement 8 nach Anspruch 2 bzw. durch Störaustastung entsprechend Anspruch 3 lassen sich die wiederkehrenden Störungen von den tatsächlichen, auf Überstrom, Erdschluß und Kurzschluß zurückgehenden Störungen trennen.In order to suppress fault messages at the output 10 of the comparison element 5 , a filter element 8 is provided. Such faults can result from the switching delays and dead times between the switches, which are often already present in the control signals for controlling the circuit breakers 2 b and 3 b. By said filter element 8 according to claim 2 or by blanking according to claim 3, the recurring faults can be separated from the actual faults due to overcurrent, earth fault and short circuit.

Claims (4)

1. Schutzeinrichtung zur Erfassung von Überstrom, Erd­ schluß und Kurzschluß in einem schaltend arbeitenden Leistungssteller, vorwiegend Frequenzumrichter, mit durch Überstrom abschaltenden Leistungsschaltern, dadurch gekennzeichnet, daß der Sollsteuerzustand für die Leistungshalbleiter mit der tatsächlichen Ausgangsspannung in einem Vergleichselement auf Gleich­ heit untersucht und bei Ungleichheit als Ausgangssig­ nal ein Fehlersignal ausgelöst wird.1. Protective device for detecting overcurrent, earth fault and short circuit in a switching power controller, mainly frequency converter, with circuit breakers that switch off due to overcurrent, characterized in that the target control state for the power semiconductors is checked for equality with the actual output voltage in a comparison element and in the event of inequality an error signal is triggered as an output signal. 2. Schutzeinrichtung nach Anspruch 1, dadurch gekenn­ zeichnet, daß das Ausgangssignal zur Unterdrückung von Fehlauslösungen durch ein Tiefpaßfilter geleitet wird. 2. Protection device according to claim 1, characterized records that the output signal for suppression of false triggers passed through a low pass filter becomes.   3. Schutzeinrichtung nach Anspruch 1, dadurch gekenn­ zeichnet, daß das Ausgangssignal zur Unterdrückung von Störimpulsen bei jedem Sollwertwechsel wenigstens für die Schaltzeit der Leistungsschalter unterdrückt wird.3. Protection device according to claim 1, characterized records that the output signal for suppression of interfering pulses at least with every setpoint change suppressed for the switching time of the circuit breaker becomes. 4. Schutzeinrichtung nach Anspruch 1, dadurch gekenn­ zeichnet, daß das Spannungssignal der Ausgangsspan­ nung über ein Zweipol aus der Reihenschaltung von einem Widerstand und einem Kondensator dem Vergleichs­ element zugeführt wird.4. Protection device according to claim 1, characterized records that the voltage signal of the output span voltage via a two - pole circuit from a resistor and a capacitor for comparison element is fed.
DE19893937447 1989-11-10 1989-11-10 PROTECTIVE DEVICE FOR FREQUENCY INVERTER Withdrawn DE3937447A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19893937447 DE3937447A1 (en) 1989-11-10 1989-11-10 PROTECTIVE DEVICE FOR FREQUENCY INVERTER
PCT/DE1990/000840 WO1991007797A1 (en) 1989-11-10 1990-11-07 Protection device for frequency converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19893937447 DE3937447A1 (en) 1989-11-10 1989-11-10 PROTECTIVE DEVICE FOR FREQUENCY INVERTER

Publications (1)

Publication Number Publication Date
DE3937447A1 true DE3937447A1 (en) 1991-05-16

Family

ID=6393268

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19893937447 Withdrawn DE3937447A1 (en) 1989-11-10 1989-11-10 PROTECTIVE DEVICE FOR FREQUENCY INVERTER

Country Status (2)

Country Link
DE (1) DE3937447A1 (en)
WO (1) WO1991007797A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4128961C1 (en) * 1991-08-29 1992-08-13 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De Detecting short circuit to earth in pulse inverter - using square wave HF voltage source in evaluation circuit to operate protection circuit when toroidal transformer saturates
DE10216986A1 (en) * 2002-04-16 2003-10-30 Heidenhain Gmbh Dr Johannes Procedure for checking an inverter
WO2004070923A2 (en) * 2003-02-05 2004-08-19 Ivan Meszlenyi Universal power converter
DE19959402B4 (en) * 1999-12-09 2006-07-06 Rohde & Schwarz Gmbh & Co. Kg driver circuit
US7161776B2 (en) 2003-05-16 2007-01-09 Siemens Aktiengesellschaft Method for monitoring a power output stage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9595889B2 (en) 2013-02-15 2017-03-14 Eaton Corporation System and method for single-phase and three-phase current determination in power converters and inverters
CN116643110B (en) * 2023-06-29 2023-10-27 山东兴楚电气工程有限公司 High-voltage frequency converter operation monitoring system

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2208674A1 (en) * 1972-02-24 1973-09-06 Licentia Gmbh SWITCH SET TO CONNECT ELECTRICAL CIRCUITS
DE2328247A1 (en) * 1972-07-27 1974-04-04 Polygraph Leipzig THRESHOLD CIRCUIT
DE2851880A1 (en) * 1977-11-30 1979-06-21 Mo Avtomobilno Dorozhnyj Inst VEHICLE
US4363068A (en) * 1980-08-18 1982-12-07 Sundstrand Corporation Power FET short circuit protection
DE3141471A1 (en) * 1981-10-20 1983-05-05 Brown, Boveri & Cie Ag, 6800 Mannheim Anti-short-circuit device for transistors
DD210793A1 (en) * 1982-10-01 1984-06-20 Robotron Zft Veb CIRCUIT ARRANGEMENT FOR THE OVERLOAD PROTECTION OF POWER TRANSISTORS IN SWITCHING POWER SUPPLIES
DE3503305A1 (en) * 1984-01-31 1985-08-01 Pioneer Electronic Corp., Tokio/Tokyo SIGNAL FAILURE DETECTOR CIRCUIT FOR A DATA PLAYER
US4621231A (en) * 1984-06-19 1986-11-04 Westinghouse Electric Corp. Toroidal sensor coil and method
DE3522429A1 (en) * 1985-06-22 1987-01-02 Bosch Gmbh Robert CIRCUIT ARRANGEMENT FOR THE DRIVER CIRCUIT OF HIGH VOLTAGE POWER TRANSISTORS
DE3616975A1 (en) * 1986-05-21 1987-11-26 Bosch Gmbh Robert METHOD FOR CHECKING LOAD RESISTANCE CIRCLES
EP0255067A1 (en) * 1986-07-29 1988-02-03 Siemens Aktiengesellschaft Current limitation circuit arrangement
DE3001632C2 (en) * 1979-01-30 1988-02-04 Sp. El. S.R.L., Mailand/Milano, It
DE3743453A1 (en) * 1986-12-24 1988-07-28 Dold & Soehne Kg E Circuit arrangement for short-circuit protection of a semiconductor amplifier element

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906258A (en) * 1974-03-04 1975-09-16 Rca Corp Failure detecting and inhibiting circuit
US4454503A (en) * 1981-09-03 1984-06-12 General Electric Company Transistor fault indicator
US4626952A (en) * 1984-08-27 1986-12-02 Mitsubishi Denki Kabushiki Kaisha Protection apparatus for a transistor inverter

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2208674A1 (en) * 1972-02-24 1973-09-06 Licentia Gmbh SWITCH SET TO CONNECT ELECTRICAL CIRCUITS
DE2328247A1 (en) * 1972-07-27 1974-04-04 Polygraph Leipzig THRESHOLD CIRCUIT
DE2851880A1 (en) * 1977-11-30 1979-06-21 Mo Avtomobilno Dorozhnyj Inst VEHICLE
DE3001632C2 (en) * 1979-01-30 1988-02-04 Sp. El. S.R.L., Mailand/Milano, It
US4363068A (en) * 1980-08-18 1982-12-07 Sundstrand Corporation Power FET short circuit protection
DE3141471A1 (en) * 1981-10-20 1983-05-05 Brown, Boveri & Cie Ag, 6800 Mannheim Anti-short-circuit device for transistors
DD210793A1 (en) * 1982-10-01 1984-06-20 Robotron Zft Veb CIRCUIT ARRANGEMENT FOR THE OVERLOAD PROTECTION OF POWER TRANSISTORS IN SWITCHING POWER SUPPLIES
DE3503305A1 (en) * 1984-01-31 1985-08-01 Pioneer Electronic Corp., Tokio/Tokyo SIGNAL FAILURE DETECTOR CIRCUIT FOR A DATA PLAYER
US4621231A (en) * 1984-06-19 1986-11-04 Westinghouse Electric Corp. Toroidal sensor coil and method
DE3522429A1 (en) * 1985-06-22 1987-01-02 Bosch Gmbh Robert CIRCUIT ARRANGEMENT FOR THE DRIVER CIRCUIT OF HIGH VOLTAGE POWER TRANSISTORS
DE3616975A1 (en) * 1986-05-21 1987-11-26 Bosch Gmbh Robert METHOD FOR CHECKING LOAD RESISTANCE CIRCLES
EP0255067A1 (en) * 1986-07-29 1988-02-03 Siemens Aktiengesellschaft Current limitation circuit arrangement
DE3743453A1 (en) * 1986-12-24 1988-07-28 Dold & Soehne Kg E Circuit arrangement for short-circuit protection of a semiconductor amplifier element

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4128961C1 (en) * 1991-08-29 1992-08-13 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De Detecting short circuit to earth in pulse inverter - using square wave HF voltage source in evaluation circuit to operate protection circuit when toroidal transformer saturates
DE19959402B4 (en) * 1999-12-09 2006-07-06 Rohde & Schwarz Gmbh & Co. Kg driver circuit
DE10216986A1 (en) * 2002-04-16 2003-10-30 Heidenhain Gmbh Dr Johannes Procedure for checking an inverter
US6825647B2 (en) 2002-04-16 2004-11-30 Dr. Johannas Heidenhain Gmbh Method for testing a frequency converter
WO2004070923A2 (en) * 2003-02-05 2004-08-19 Ivan Meszlenyi Universal power converter
WO2004070923A3 (en) * 2003-02-05 2004-09-30 Ivan Meszlenyi Universal power converter
US7161776B2 (en) 2003-05-16 2007-01-09 Siemens Aktiengesellschaft Method for monitoring a power output stage

Also Published As

Publication number Publication date
WO1991007797A1 (en) 1991-05-30

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Legal Events

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8139 Disposal/non-payment of the annual fee