WO2008067782A1 - Verfahren zum ansteuern von zumindest zwei elektromagnetischen relais und steuereinrichtung zur durchführung des verfahrens - Google Patents
Verfahren zum ansteuern von zumindest zwei elektromagnetischen relais und steuereinrichtung zur durchführung des verfahrens Download PDFInfo
- Publication number
- WO2008067782A1 WO2008067782A1 PCT/DE2006/002204 DE2006002204W WO2008067782A1 WO 2008067782 A1 WO2008067782 A1 WO 2008067782A1 DE 2006002204 W DE2006002204 W DE 2006002204W WO 2008067782 A1 WO2008067782 A1 WO 2008067782A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- current
- relay
- holding
- control device
- currents
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
- H01H47/32—Energising current supplied by semiconductor device
- H01H47/325—Energising current supplied by semiconductor device by switching regulator
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
Definitions
- the invention relates to a method for controlling at least two electromagnetic relays, in which after switching on a respective relay whose relay contacts are held by means of a current flowing through a relay coil of the relay pulsed holding current in its on position.
- the invention further relates to a control device for carrying out the method.
- Electromagnetic relays In electrical devices, electromagnetic relays are often used to perform controlled switching operations. Electromagnetic relays usually consist of a relay coil and at least one pair of electrical relay contacts. If an electric current is applied to the relay coil, a magnetic field is generated around the relay coil, whereby a movable contact of the relay contacts is moved to the other contact. If the relay contacts finally touch, a current flow is possible via them. When the current flowing through the relay coil is interrupted again, the movable contact becomes. for example, by means of a spring device moved back to its original position, so that the relay contacts are back in their open position and no current flow can take place over them.
- a pulsed holding current is to be understood as meaning an electrical current which is suitable for holding the relay contacts in their switched-on state and composed of a plurality of successive current pulses, between which the electric current in each case drops to zero or at least a significantly lower value accepts.
- a pulsed current may be a rectangular current.
- EP 0 392 058 A1 it is known from European published patent application EP 0 392 058 A1 to control a plurality of mutually parallel relay coils of electromagnetic relays via a common pulsed holding current. The pulsation is adjusted to the number of switched-on relays and to the temperature of the relays so that a required incidenthaitestrom not be exceeded.
- US Pat. No. 5,402,302 also discloses a drive circuit for relay coils of a plurality of electromagnetic relays, in which a pulsed holding current is supplied to a plurality of relay coils connected in parallel with one another.
- the object of the invention is to specify a method and a control device for activating at least two electromagnetic relays in such a way that a heat emission caused by the holding current is reduced even further.
- the object is achieved by a method of the type mentioned at the outset, in which ner control device for the relay coils via at least two An horraus sauté sau from temporally successive current pulses composite holding currents are delivered, which are adapted to hold the respective relay contacts in their on state, and the control device emits the pulsed holding currents to the An horraus saun in such a way that to each arbitrary point in time, only at exactly one of the An horrausginge a current pulse is delivered.
- the invention is therefore based on the finding that by a time-delayed delivery of the current pulses to the relay coils via separate drive outputs in an advantageous manner, a lower current flow through all relay coils and their leads takes place and the heat output is therefore lower than at all the same at all relay coils in Parallel connection delivered current pulses would be the case.
- the respective holding currents for the relay coils are generated from a common source current, by splitting the source current into current pulses for the respective relay coils by means of a control device such that a pulsed holding current is generated for each relay coil , In this way, the respective holding currents can be generated particularly easily by breaking the source current into a plurality of pulsed holding currents.
- the source current can be a current of any kind, eg an alternating current. However, it is considered particularly advantageous if a constant direct current is used as the source current. Such a constant Gleiqhstrom can namely be decomposed in a simple manner in square-wave current pulses, so that to hold the relay coils suitable holding currents arise.
- the holding current is delivered to exactly one relay coil in each case by means of each drive output of the control device.
- the holding current is delivered to exactly one relay coil at each drive output.
- the holding current is delivered to at least two relay coils connected in parallel by means of at least one drive output of the control device. In this case, several parallel-connected relay per control output of the control device could be provided.
- a further advantageous embodiment of the method according to the invention also provides that the respective pulsed holding current is smoothed by means of an electrical storage device.
- the holding current supplied to a relay coil can be more uniformly supplied to the relay coil.
- the electrical storage device may be a capacitor.
- control device information is supplied to which control outputs a holding current is to be delivered to hold corresponding relay in the on state, and the controller based on this information correspondingly many current pulses to form generated respective holding currents and these holding currents via the corresponding control outputs the relay coils of the switched on stand to be held relays.
- control device always generates the number of its control outputs correspondingly many current pulses to form corresponding holding currents and the respective relay coils are applied via their respective associated switching devices with the respective holding current when the respective relays are kept in the on state should. In this case, the relay coils are thus acted upon by separate switching devices with the holding currents.
- the advantage of this embodiment is that a regularly recurring current pulse of the same size is provided for each drive output and no further measures for adapting the current pulses become necessary.
- both the control device and the electromagnetic relay are components of an electrical protection, control, field or power quality device or an electrical energy meter. Namely, such devices are usually encapsulated electrical devices of smaller design without active cooling mechanisms, where a low heat emission from electromagnetic relays is advantageous.
- the invention will be described below, with reference to exemplary embodiments. Show this
- FIG. 1 is a schematic representation of an electromagnetic relay
- FIG. 2 shows a current-time diagram with different holding currents
- Figure 4 shows the course of pulsed holding currents for driving two electromagnetic relays according to a
- FIG. 5 shows a schematic block diagram for explaining the activation of two electromagnetic relays
- FIG. 6 shows a current-time diagram for representing three pulsed holding currents
- FIG. 7 shows a current-time diagram for explaining a first exemplary embodiment of a change from three pulsed holding currents to four pulsed holding currents, FIG.
- FIG. 8 shows a current-time diagram for explaining a second exemplary embodiment of a change from three pulsed holding currents to four pulsed holding currents
- FIG. 9 shows a block diagram for explaining a further exemplary embodiment of an arrangement for controlling a plurality of electromagnetic relays
- FIG. 10 shows a schematic block diagram with a first exemplary embodiment of the connection of a plurality of electromagnetic relays to control outputs of a control device
- FIG. 11 shows a schematic block diagram with a second exemplary embodiment of the connection of a plurality of electromagnetic relays to control outputs of a control device.
- Figure 1 shows the structure of a conventional electromagnetic relay 10 in a schematic representation.
- Such relays find use, for example, in electrical devices to allow current flow through a control circuit in a separate load circuit.
- such devices may be electrical automation devices for automating electrical power networks, such as those described in US Pat. electrical protection,
- Control, field, or power quality devices or even act around electrical energy meters.
- the relay 10 has a relay coil 11 and relay contacts 12.
- the relay coil 11 can be electrically contacted via first terminals 13.
- the relay contacts 12 are electrically contacted via second terminals 14.
- an inrush current is applied to the first terminals 13, which causes the generation of a magnetic field in the relay coil 11.
- a moving Licher contact 12a of the relay contacts 12 against the spring force of the spring 15 to a fixed contact 12b of the relay contacts 12 to move until the relay contacts 12 are in galvanic connection and a current flow through the second terminals 14 of the relay 10 and the now closed relay contacts 12 take place can.
- Equation (1) Equation (1), where I is the current flowing through the relay coil 11.
- FIG. 2 should be considered in addition to FIG.
- FIG. 2 shows by way of example a diagram in which the current intensity is plotted over time.
- holding current I 1 a constant direct current which is represented by a straight line 21 in the diagram and which is suitable for generating a sufficient magnetic field in the relay coil 11 (see FIG. 1) in order to hold the relay contacts 12 in their closed position . Due to the current flow SES the holding current I ⁇ generated in the relay coil 11 thermal power must be continuously to the environment of the relay coil
- FIG. 2 shows another holding current, which is shown by a dash-dotted line 22.
- This holding current is a pulsed holding current in the form of a rectangular current. This means that the holding current has current pulses 23, during which the holding current assumes its maximum value I 2 . Between the current pulses 23 there are regions 24 to which the holding current assumes the value zero (or at least a significantly lower value than during the current pulses). This pulsed holding current must also be able to generate in the relay coil 11 a magnetic field that is sufficient, the relay contacts
- the relay coil 11 Compared to the holding current in the form of direct current according to the straight line 21, however, the relay coil 11 must be supplied with a larger amount of energy during the current pulses 23, so that a sufficient force is still exerted on the relay contacts 12 during the regions 24 between the current pulses 23. Therefore, the maximum I 2 of the pulsed holding current is greater than the holding current Ii by a certain amount. If the current pulses are further shortened in time, as shown by way of example in FIG. 2 by the dotted curve 25 of a further pulsed holding current, then the maximum current intensity I 3 during the current pulses 26 must be selected to be even greater in order to produce a sufficiently strong current To cause magnetic field in the relay coil 11.
- FIG. 3 shows another current-time diagram.
- a pulsed holding current for driving two parallel-connected relay coils according to the already explained in the introduction of the prior art shown.
- a first component 31 of the holding current is required for the relay coil of the first, a second portion 32 for the relay coil of the second of the two relays.
- further portions of the holding current above the portion 32 would accordingly be added. It can be seen from FIG. 3 that as the number of relay coils supplied in parallel with a pulsed holding current increases, the maximum current intensity of the holding current increases.
- each of the relay coils connected in parallel is only supplied with the simple amount of the holding current, since in a parallel circuit the current is divided equally into equal loads.
- the holding current increases according to the number of relay coils supplied and leads there according to the equations (1) and (2) to an increased heat dissipation.
- FIG. 4 shows another possibility of driving two relay coils with pulsed holding currents.
- Time offset in this context means that there is no overlapping of the current pulses, but at any given time there is always only one current pulse 41 or 42. In this way, it can be achieved that the maximum required current intensity is lower than in the prior art according to FIG. 3 and that the total amount of heat emitted by the relay coils is comparatively lower.
- FIG. 5 shows an arrangement 50 for driving two electromagnetic relays 51a and 51b.
- a control device 52 is provided which has a first drive output 53a and a second drive output 53b.
- relay coils 54a and 54b are supplied with holding currents to hold their associated relay contacts 55a and 55b in their on state.
- the functionality is as follows:
- the control device outputs a pulsed holding current 57a or 57b at each drive output 53a or 53b.
- the current pulses of the two holding currents 57a and 57b are hereby arranged, as is known in FIG. 5 by dashed auxiliary lines, with a time offset from one another such that a current pulse is output at only an exactly maximum one of the drive outputs 53a and 53b at any given time ,
- the holding current 57a for the relay 51a always has a current pulse just when the Holding current 57b has a zero range (ie a range between two current pulses, in which the holding current takes the value zero) and vice versa.
- the electric power converted into heat is comparatively lower compared with an arrangement in which the relays 51a and 51b would be supplied in parallel with the same pulsed holding current.
- the holding currents 57a and 57b may be e.g. be generated by Rechteckgenerato- ren in the controller. But it can also be provided that in the control device 52, a common source current, for. B. a constant direct current as indicated by a diagram 56, in the first pulsed holding current 57a and the second pulsed holding current 57b is decomposed.
- an electrical storage device for example in each case a capacitor 58a and 58b, can optionally be provided in the circuits of the holding currents 57a and 57b. be provided, which is continuously charged by the current pulses or discharged between the current pulses and thus produces a more uniform current flow for the relay coils 54a and 54b.
- FIG. 6 shows, by way of example, a current-time diagram which shows the activation of three relay coils with correspondingly pulsed holding currents. It can be seen that now per unit time three current pulses are distributed to three different holding currents. For this purpose, either three rectangular generators can be used or the possibly present common source current is divided into three pulsed holding currents whose current pulses each take place with a time offset from one another.
- the course of the holding currents is to be explained by way of example on the basis of the current pulses 61a to 61d highlighted in bold.
- a current pulse 61a produced In the course 62a of a holding current for a relay coil of a first relay from an arbitrarily picked out time t 0, a current pulse 61a produced.
- This current pulse 61 ends at a time t x.
- a second current pulse 61b starts in a path 62b of a holding current for a relay coil of a second electromagnetic relay.
- This ends at a time t 2 to which a third current pulse 61 c is generated in a third curve 62 c of a holding current for a relay coil of a third relay.
- this third current pulse 61 c ends.
- a fourth current pulse 61d sets in, which now belongs again to the first current profile 62a of the holding current for the relay coil of the first electromagnetic relay. From there, the delivery of the current-offset generated current pulses for the three holding currents is repeated, as shown in the further course of the holding currents according to FIG.
- Figure 7 shows in a current-time diagram, the change of three to four output by the control means holding currents.
- One firstly recognizes courses 71a, 71b and 71c of three pulsed holding currents, the current pulses of each of which, as explained with reference to FIG. 6, occur with a time offset from one another.
- a further holding current is to be generated.
- a fourth pulsed holding current is consequently emitted by the control device in a fourth course 7 Id. Since the current pulses, z. B.
- the respective current pulses can be increased by an amount .DELTA.I, as exemplarily shown schematically in the course 71a of the first holding current, in order to provide each relay coil with a holding current which is suitable for the respective relay contacts in their switched-on state to keep.
- the method according to FIG. 7 presupposes that the control device in each case has knowledge as to which of its on-control outputs holding currents are to be delivered.
- the control device can resort to results of a control program for an electrical device, which is part of the electromagnetic relays, these results indicate which relays are turned on at which control outputs of the control device and to be kept in the on state.
- the control device constantly generates the maximum possible number of pulsed holding currents with time-offset current pulses corresponding to the number of their drive outputs.
- the control device has four drive outputs and therefore constantly generates current pulses at all four drive outputs, as indicated by curves 81a to 81d.
- the control device outputs a holding current with correspondingly time-offset current pulses at each of its drive outputs.
- the holding current of the course 8 Id is not supplied to the corresponding relay coil, but interrupted, for example, by an additional switch which is arranged in front of the relay coil. chen. Therefore, the current pulses in the course 8 Id in FIG. 8 are initially shown in dashed lines because they do not actually reach the relay coil. From time t 0 , all four holding currents of the courses 81a to 81d should reach the corresponding relay coils. For this purpose, for example, the switch is closed in front of the fourth relay coil for the holding current according to current profile 81d and fed to the relay coil. Accordingly, in Figure 8, the current waveform 81d is from the time t 0 is no longer dashed lines but shown in solid line. The advantage of the procedure according to FIG.
- control device does not have to react dynamically to the number of electromagnetic relays to be triggered, but constantly generates the maximum number of holding currents which, depending on the position of the switches, are supplied to the respective relay relay of the respective relay coil be or not.
- this also has the advantage that the common source current, from which all holding currents are generated by decomposition, could constantly flow with constant current intensity because the respective current pulses constantly have the same maximum current intensity ,
- FIG. 9 shows an exemplary embodiment of an arrangement for controlling a number of electromagnetic relays, as can be used in the mode of operation which has been explained in accordance with FIG.
- the arrangement 90 for controlling a plurality of electromagnetic relays has a control device 91 which on. their control outputs 92a to 92d constantly pulsed holding currents outputs, the current pulses as shown in Figure 8, are given with a time delay to each other.
- the holding currents are supplied via switching devices 93a to 93d relay coils 94a to 94d corresponding electromagnetic relays 95a to 95d to the these relays 95a to 95d associated relay contacts 96a to 96d to keep in their on state.
- the switching device 93d is opened.
- the pulsed holding currents at the drive outputs 92a to 92c of the control device 91 are supplied to the respective relay coils 94a to 94c to keep the relay contacts 96a to 96c in the on state.
- the holding current emitted at the drive output 92d of the control device 91 is interrupted by the opened switching device 93d, so that no current flows through the relay coil 94d and the relay contacts 96d are switched off.
- the state shown in Figure 9 thus corresponds to the state in Figure 8 before the time to.
- the switching device 93d in FIG. 9 would now be switched on in order to supply the relay coil 94d to the pulsed holding current emitted by the drive output 92d.
- FIGS. 10 and 11 show the connection of a plurality of electromagnetic relays to a control device.
- While four electromagnetic relays 102a to 102b are connected to the control device 101 in FIG. 10 such that a respective relay 102a to 102d with its relay coil is connected to each control output 103a to 103d of the control device 101, the control device 111 according to FIG Each of the drive outputs 113b to 113d is connected to a relay 112c, 112d and 112e, while two electromagnetic relays 112a, 112b are connected in parallel to the drive output 113a.
- Such a constellation can be useful, for example, if, for example, the two relays 112a, 112b are of smaller construction and require a smaller holding current than the other relays 112c to 112e.
- the relays 112a and 112b become constantly driven parallel to each other and, if necessary, as explained to Figure 9 with upstream switching devices perform separately switchable.
- the control device would either increase the current strength of the respective current pulses corresponding to the clock rate of the current pulses until the contacts are closed. Since the switch-on is comparatively short compared to the holding state of the relay, it is not critical thermally when switching on, at the same time deliver power pulses or even a continuous Einschaltström at several control outputs of the controller. After switching on the relay contacts, the inrush current is in any case replaced by a holding current, as described in the figures.
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Abstract
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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PCT/DE2006/002204 WO2008067782A1 (de) | 2006-12-06 | 2006-12-06 | Verfahren zum ansteuern von zumindest zwei elektromagnetischen relais und steuereinrichtung zur durchführung des verfahrens |
DE112006004199T DE112006004199A5 (de) | 2006-12-06 | 2006-12-06 | Verfahren zum Ansteuern von zumindest zwei elektromagnetischen Relais und Steuereinrichtung zur Durchführung des Verfahrens |
Applications Claiming Priority (1)
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PCT/DE2006/002204 WO2008067782A1 (de) | 2006-12-06 | 2006-12-06 | Verfahren zum ansteuern von zumindest zwei elektromagnetischen relais und steuereinrichtung zur durchführung des verfahrens |
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WO2008067782A1 true WO2008067782A1 (de) | 2008-06-12 |
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PCT/DE2006/002204 WO2008067782A1 (de) | 2006-12-06 | 2006-12-06 | Verfahren zum ansteuern von zumindest zwei elektromagnetischen relais und steuereinrichtung zur durchführung des verfahrens |
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DE (1) | DE112006004199A5 (de) |
WO (1) | WO2008067782A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2015332A2 (de) * | 2007-07-10 | 2009-01-14 | Yazaki North America, Inc. | Geschlossener Relaistreiber mit Gleichphasenintervall |
DE102012213162A1 (de) * | 2012-07-26 | 2013-09-05 | Siemens Aktiengesellschaft | Schaltgerät mit elektromagnetischen Schaltelementen |
DE102017212063A1 (de) * | 2017-07-14 | 2019-01-17 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Betreiben eines elektromechanischen Schaltrelais |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3331678A1 (de) * | 1983-09-02 | 1985-04-04 | Westdeutsche Elektrogerätebau GmbH, 4770 Soest | Schaltungsanordnung fuer eine durch aeussere beschaltung zeitlich begrenzbare anzugs- und halte-erregung eines relais |
EP1273500A1 (de) * | 2001-07-02 | 2003-01-08 | Alcatel | Steuerung für ein Relais |
EP1517201A2 (de) * | 2003-07-31 | 2005-03-23 | FAGOR, S.Coop | Ausfallsichere Steuerschaltung für Elektrogeräte |
-
2006
- 2006-12-06 DE DE112006004199T patent/DE112006004199A5/de not_active Withdrawn
- 2006-12-06 WO PCT/DE2006/002204 patent/WO2008067782A1/de active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3331678A1 (de) * | 1983-09-02 | 1985-04-04 | Westdeutsche Elektrogerätebau GmbH, 4770 Soest | Schaltungsanordnung fuer eine durch aeussere beschaltung zeitlich begrenzbare anzugs- und halte-erregung eines relais |
EP1273500A1 (de) * | 2001-07-02 | 2003-01-08 | Alcatel | Steuerung für ein Relais |
EP1517201A2 (de) * | 2003-07-31 | 2005-03-23 | FAGOR, S.Coop | Ausfallsichere Steuerschaltung für Elektrogeräte |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2015332A2 (de) * | 2007-07-10 | 2009-01-14 | Yazaki North America, Inc. | Geschlossener Relaistreiber mit Gleichphasenintervall |
JP2009022002A (ja) * | 2007-07-10 | 2009-01-29 | Yazaki North America Inc | 等位相間隔の閉ループリレードライバ |
EP2015332A3 (de) * | 2007-07-10 | 2009-12-16 | Yazaki North America, Inc. | Geschlossener Relaistreiber mit Gleichphasenintervall |
DE102012213162A1 (de) * | 2012-07-26 | 2013-09-05 | Siemens Aktiengesellschaft | Schaltgerät mit elektromagnetischen Schaltelementen |
DE102017212063A1 (de) * | 2017-07-14 | 2019-01-17 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Betreiben eines elektromechanischen Schaltrelais |
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DE112006004199A5 (de) | 2009-11-05 |
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