DE3144018A1 - Circuit arrangement for detecting the zero crossings of electrical currents - Google Patents

Circuit arrangement for detecting the zero crossings of electrical currents

Info

Publication number
DE3144018A1
DE3144018A1 DE19813144018 DE3144018A DE3144018A1 DE 3144018 A1 DE3144018 A1 DE 3144018A1 DE 19813144018 DE19813144018 DE 19813144018 DE 3144018 A DE3144018 A DE 3144018A DE 3144018 A1 DE3144018 A1 DE 3144018A1
Authority
DE
Germany
Prior art keywords
circuit arrangement
zero crossings
zero
detecting
magnetic core
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Withdrawn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
DE19813144018
Other languages
German (de)
Inventor
Wolfgang 8520 Erlangen Rüger
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE19813144018 priority Critical patent/DE3144018A1/en
Publication of DE3144018A1 publication Critical patent/DE3144018A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero

Abstract

The current (i), the zero crossings of which are to be detected, is supplied to the primary winding (2) of a magnetic core (1) with a rectangular hysteresis curve and a coercive field strength of the order of magnitude of zero. Across the secondary winding (3) of the magnetic core (1), voltage peaks (U) are picked up which are produced with each zero crossing of this current (i). <IMAGE>

Description

Schaltungsanordnung zum Erfassen der NulldurchgängeCircuit arrangement for detecting the zero crossings

elektrischer Ströme Die Erfindung betrifft eine Schaltungsanordnung zum Erfassen der Nulldurchgänge elektrischer Ströme, die bei den Nulldurchgängen elektrische Spannungsspitzen liefert. Solche Schaltungsanordnungen werden beispielsweise zur Erfassung der Nulldurchgänge mittelfrequenter Ströme bei Wechselrichtern verwendet und können dort zur Schonzeiterfassung von Thyristoren dienen.electrical currents The invention relates to a circuit arrangement for detecting the zero crossings of electrical currents that occur at the zero crossings supplies electrical voltage peaks. Such circuit arrangements are for example used to record the zero crossings of medium-frequency currents in inverters and can be used there for closed-season detection of thyristors.

Der Erfindung liegt die Aufgabe zugrunde, eine besonders einfache und mit wenig Bauelementen bestückte Schaltungsanordnung der genannten Art zu schaffen.The invention is based on the object of a particularly simple one and to create a circuit arrangement of the type mentioned with few components.

Diese Aufgabe ist erfindungsgemäß gelöst durch einen Magnetkern mit rechteckiger Hysteresekurve und einer Koerzitivfeldstärke in der Größenordnung von Null, der eine Primärwicklung, der der elektrische Strom zugeführt wird und eine Sekundärwicklung, an der bei den Nulldurchgängen entstehende Spannungsspitzen abgenommen werden, besitzt. Die erfindungsgemäße Schaltungsanordnung kommt mit einem Magnetkern aus, wobei es in besonders einfacher Weise genügt, diesen mit einer Sekundärwicklung zu versehen und die Primärwicklung dadurch zu bilden, daß ein den zu erfassenden elektrischen Strom führender elektrischer Leiter durch den Magnetkern hindurchgefädelt wird, so daß die Primärwindungszahl eins ist.This object is achieved according to the invention by having a magnetic core rectangular hysteresis curve and a coercive field strength of the order of magnitude of Zero, the one primary winding to which the electric current is supplied and one Secondary winding from which voltage peaks occurring at the zero crossings are removed will owns. The circuit arrangement according to the invention comes with a magnetic core off, it being sufficient in a particularly simple manner to provide this with a secondary winding to be provided and to form the primary winding in that a to be detected Electric current-carrying electrical conductor threaded through the magnetic core so that the primary number of turns is one.

Die Erfindung ist nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert. Es zeigen: Fig. 1 eine Schaltungsanordnung nach der Erfindung, und Fig. 2 bis 4 Kurven zur Erläuterung der Schaltungsanordnung gemäß Figur 1.The invention is based on one in the drawing illustrated embodiment explained in more detail. 1 shows a circuit arrangement according to the invention, and FIGS. 2 to 4 curves to explain the circuit arrangement according to Figure 1.

In der Figur 1 ist ein ringförmiger Magnetkern 1 mit rechteckiger Hysteresekurve und einer Koerzitivfeldstärke in der Größenordnung von Null dargestellt. Demgemäß hat die Hysteresekurve beispielsweise den in Figur 2 dargestellten Verlauf. Durch den Magnetkern 1 ist ein elektrischer Leiter 2 als Primärwicklung gefädelt, der einen Strom führt, von dem die Nulldurchgänge erfaßt werden sollen. Der Magnetkern 1 trägt eine Sekundärwicklung 3, an der eine Spannung U abgegriffen wird.In the figure 1 is an annular magnetic core 1 with a rectangular Hysteresis curve and a coercive field strength on the order of zero. Accordingly, the hysteresis curve has the course shown in FIG. 2, for example. An electrical conductor 2 is threaded through the magnetic core 1 as the primary winding, which carries a current from which the zero crossings are to be detected. The magnetic core 1 carries a secondary winding 3 from which a voltage U is tapped.

Aufgrund der Hysteresekurve gemäß Figur 2 kommt der Magnetkern bei geringster Durchflutung bereits in die Sättigung und erzeugt bei jedem Nulldurchgang des Stromes im Leiter 2 in der Sekundärwicklung 3 eine Spannungsspitze. Die Polarität der Spannungsspitze hängt von der Stromrichtung, die dem Nulldurchgang vorausgeht, und der Orientierung der Sekundärwicklung 3 ab. Die Figur 3 zeigt beispielsweise einen zeitlichen Verlauf für den Strom i im Leiter 2 und die Figur 4 den Spannungsverlauf an der Sekundärwicklung 3.Due to the hysteresis curve according to FIG. 2, the magnetic core comes in lowest flow rate already in saturation and generated at every zero crossing of the current in the conductor 2 in the secondary winding 3 has a voltage spike. The polarity the voltage peak depends on the direction of the current which precedes the zero crossing, and the orientation of the secondary winding 3. Figure 3 shows, for example a time curve for the current i in the conductor 2 and FIG. 4 the voltage curve on the secondary winding 3.

Die Windungszahl der Sekundärwicklung 3 kann in zweckmäßiger Weise wie diejenige der Primärwicklung eins sein.The number of turns of the secondary winding 3 can expediently be one like that of the primary winding.

4 Figuren 2 Patentansprüche Leerseite4 figures 2 claims Blank page

Claims (2)

Patentansprüche 1. Schaltungsanordnung zum Erfassen der Nulldurchgänge trischer Ströme, g e k e n n z e i c h n e t d u r c h einen Magnetkern (1) mit rechteckiger Hysteresekurve und einer Koerzitivfeldstärke in der Größenordnung von Null, der eine Primärwicklung (2), der der elektrische Strom zugeführt wird, und eine Sekundärwicklung (3), an der bei den Nulldurchgängen entsprechende Spannungsspitzen abgenommen werden, besitzt.Claims 1. Circuit arrangement for detecting the zero crossings tric currents, g e k e n n z e i c h n e t d u r c h a magnetic core (1) with rectangular hysteresis curve and a coercive field strength of the order of magnitude of Zero, the one primary winding (2) to which the electrical current is supplied, and a secondary winding (3) on which corresponding voltage peaks at the zero crossings be removed, owns. 2. Schaltungsanordnung nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß die Windungszahl der Primärwicklung (2) und der Sekundärwicklung (3) eins ist.2. Circuit arrangement according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the number of turns of the primary winding (2) and the secondary winding (3) is one.
DE19813144018 1981-11-05 1981-11-05 Circuit arrangement for detecting the zero crossings of electrical currents Withdrawn DE3144018A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19813144018 DE3144018A1 (en) 1981-11-05 1981-11-05 Circuit arrangement for detecting the zero crossings of electrical currents

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19813144018 DE3144018A1 (en) 1981-11-05 1981-11-05 Circuit arrangement for detecting the zero crossings of electrical currents

Publications (1)

Publication Number Publication Date
DE3144018A1 true DE3144018A1 (en) 1983-05-19

Family

ID=6145723

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19813144018 Withdrawn DE3144018A1 (en) 1981-11-05 1981-11-05 Circuit arrangement for detecting the zero crossings of electrical currents

Country Status (1)

Country Link
DE (1) DE3144018A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0207922A1 (en) * 1985-06-20 1987-01-07 Siemens Aktiengesellschaft Process and apparatus for the surveillance of beacon lights

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0207922A1 (en) * 1985-06-20 1987-01-07 Siemens Aktiengesellschaft Process and apparatus for the surveillance of beacon lights

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