GB1482815A - Circuit arrangement for the switching over of an electromagnet from its actuating current to a holding current - Google Patents

Circuit arrangement for the switching over of an electromagnet from its actuating current to a holding current

Info

Publication number
GB1482815A
GB1482815A GB4622274A GB4622274A GB1482815A GB 1482815 A GB1482815 A GB 1482815A GB 4622274 A GB4622274 A GB 4622274A GB 4622274 A GB4622274 A GB 4622274A GB 1482815 A GB1482815 A GB 1482815A
Authority
GB
United Kingdom
Prior art keywords
current
capacitor
electromagnet
diode
triac
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
GB4622274A
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.)
Elster Kromschroeder GmbH
Original Assignee
G Kromschroeder 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
Priority claimed from DE19732353396 external-priority patent/DE2353396A1/en
Priority claimed from DE2420037A external-priority patent/DE2420037A1/en
Application filed by G Kromschroeder AG filed Critical G Kromschroeder AG
Publication of GB1482815A publication Critical patent/GB1482815A/en
Expired legal-status Critical Current

Links

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

Abstract

1482815 Energizing circuits for electromagnets G KROMSCHRODER AG 25 Oct 1974 [25 Oct 1973 25 April 1974] 46222/74 Heading H2H [Also in Division H3] An electromagnet is supplied from a full wave rectifier connected to an A.C. source through a bidirectional switching element that first conducts for a greater part of the A.C. half cycles to provide a pull-in current and after a time conducts for a lesser part of the A.C. half cycles to provide a holding current. As described a valve-operating solenoid 1 is connected by a bridge rectifier 2, 3, 4, 5 to a triac 7. When A.C. is first applied to terminals 6, 8 each half cycle is almost completely passed by triac 7 because the voltage applied to the trigger diode 11 rapidly reaches the trigger level thereof. After a time determined by timer 11 an electronic or mechanical switch 17 closes and capacitor 16 delays the triggering of diode 11 to a later point in the half cycles reducing the mean current through triac 7 to the holding value of electromagnet 1. Instead of simply timing, circuit 18 may respond to electromagnet current or field strength or movement of the armature. In a modification, Fig. 2 (not shown) capacitor 16 is permanently connected to trigger diode 11 and the timer contact shunts resistor 10 during the initial high current phase of operation. In another embodiment, Fig. 3 (not shown), capacitor 16 is shunted by a transistor which is initially off but after a time determined by a resistor-capacitor circuit conducts to reduce the charging current to capacitor 16 and hence delay the triggering of diode 11.
GB4622274A 1973-10-25 1974-10-25 Circuit arrangement for the switching over of an electromagnet from its actuating current to a holding current Expired GB1482815A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19732353396 DE2353396A1 (en) 1973-10-25 1973-10-25 Electromagnet switching from attraction to holding excitation - uses only one winding designed for reduced holding current and accepting initial attraction current
DE2420037A DE2420037A1 (en) 1974-04-25 1974-04-25 Electromagnet excitation circuit - holding current is reduced by phase chopping control after initial full power excitation

Publications (1)

Publication Number Publication Date
GB1482815A true GB1482815A (en) 1977-08-17

Family

ID=25766002

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4622274A Expired GB1482815A (en) 1973-10-25 1974-10-25 Circuit arrangement for the switching over of an electromagnet from its actuating current to a holding current

Country Status (4)

Country Link
FR (1) FR2249414B1 (en)
GB (1) GB1482815A (en)
IT (1) IT1022723B (en)
NL (1) NL7411941A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2170669A (en) * 1985-02-05 1986-08-06 Era Patents Ltd Solenoid energisation circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5128825A (en) * 1990-02-01 1992-07-07 Westinghouse Electric Corp. Electrical contactor with controlled closure characteristic

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2170669A (en) * 1985-02-05 1986-08-06 Era Patents Ltd Solenoid energisation circuit

Also Published As

Publication number Publication date
FR2249414A1 (en) 1975-05-23
NL7411941A (en) 1975-04-29
FR2249414B1 (en) 1979-02-16
IT1022723B (en) 1978-04-20

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed