GB1324100A - Three phase current control system - Google Patents

Three phase current control system

Info

Publication number
GB1324100A
GB1324100A GB1324100DA GB1324100A GB 1324100 A GB1324100 A GB 1324100A GB 1324100D A GB1324100D A GB 1324100DA GB 1324100 A GB1324100 A GB 1324100A
Authority
GB
United Kingdom
Prior art keywords
thyristors
circuit
supply
control
pair
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
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.)
SCHALTELEKTRONIK VEB K
Original Assignee
SCHALTELEKTRONIK VEB K
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 SCHALTELEKTRONIK VEB K filed Critical SCHALTELEKTRONIK VEB K
Publication of GB1324100A publication Critical patent/GB1324100A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

1324100 Electric furnace control systems KOMBINAT SCHALTELEKTRONIK VEB 19 Nov 1970 55134/70 Heading H2H A system for controlling the currents flowing in the heating elements 2 of an electric furnace 1 which is connected to an A.C. supply RST by way of pairs of reversely connected thyristors Th 1 , Th 2 , comprises a ring counter Z energized by pulses generated by a Schmitt trigger circuit T connected to the A.C. supply, the output of the counter Z being fed to a logic circuit LV by means of which the pair of thyristors Th 2 is controlled directly and the pair of thyristors Th 1 is controlled by way of a delay unit V. The pulses generated by the trigger circuit have the lagging edges thereof coinciding with zero passages of the A.C. supply voltage and a switch G is provided to control the output signals from the circuit LV. A phase shifting element A may be used to control the logic circuit LV.
GB1324100D 1970-11-19 1970-11-19 Three phase current control system Expired GB1324100A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5513470 1970-11-19

Publications (1)

Publication Number Publication Date
GB1324100A true GB1324100A (en) 1973-07-18

Family

ID=10473062

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1324100D Expired GB1324100A (en) 1970-11-19 1970-11-19 Three phase current control system

Country Status (1)

Country Link
GB (1) GB1324100A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004199A1 (en) * 1978-03-14 1979-09-19 Donald George Thomas Method and apparatus for supplying electric current to a number of electrical loads
EP0144454A2 (en) * 1983-12-05 1985-06-19 LICENCIA Találmányokat Ertékesitö Vállalat Method and apparatus for switching three-phase loads with an ohmic-inductive character, in particular asynchronous machines and transformers to the mains

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004199A1 (en) * 1978-03-14 1979-09-19 Donald George Thomas Method and apparatus for supplying electric current to a number of electrical loads
EP0144454A2 (en) * 1983-12-05 1985-06-19 LICENCIA Találmányokat Ertékesitö Vállalat Method and apparatus for switching three-phase loads with an ohmic-inductive character, in particular asynchronous machines and transformers to the mains
EP0144454A3 (en) * 1983-12-05 1985-07-17 LICENCIA Találmányokat Ertékesitö Vállalat Method and apparatus for switching three-phase loads with an ohmic-inductive character, in particular asynchronous machines and transformers to the mains

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees