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GB921428A - Static switching systems - Google Patents

Static switching systems

Info

Publication number
GB921428A
GB921428A GB3883260A GB3883260A GB921428A GB 921428 A GB921428 A GB 921428A GB 3883260 A GB3883260 A GB 3883260A GB 3883260 A GB3883260 A GB 3883260A GB 921428 A GB921428 A GB 921428A
Authority
GB
United Kingdom
Prior art keywords
breakdown
current
voltage
control
rectifier
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
GB3883260A
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of GB921428A publication Critical patent/GB921428A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region

Landscapes

  • Control Of Ac Motors In General (AREA)

Abstract

921,428. Control of A.C. motors. WESTING- HOUSE ELECTRIC CORPORATION. Nov. 11, 1960 [Dec. 17, 1959], No. 38832/60. Class 38 (3). [Also in Group XL (c)] An A.C. load, e.g. a three-phase induction motor 2, is controlled by a hyperconductive, negative resistance, adjustable breakdown device 8 in each line, and across each device is connected a rectifier 10. In the forward direction the devices effectively block until a breakdown voltage across emitter 20 and collector 22 is reached, when they exhibit negative resistance and a large current flows while the potential drops. The breakdown voltage is reduced by applying a continuous or, suitably phased, pulsed control current to electrode 24 from a supply 12. In the reverse direction the device has a Zener characteristic, but since repeated operation with a reverse voltage in excess of the Zener breakdown value may cause failure the rectifier 10 is provided to carry the negative half-cycles of current. The forward breakdown voltage with zero control current is higher than the supply voltage, so the device may be used as a switch, actuated by applying or removing the control current, but also the value of the current may be adjusted to cause breakdown at different points on the A.C. cycle to give speed control of the motor.
GB3883260A 1959-12-17 1960-11-11 Static switching systems Expired GB921428A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86018259A 1959-12-17 1959-12-17

Publications (1)

Publication Number Publication Date
GB921428A true GB921428A (en) 1963-03-20

Family

ID=25332677

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3883260A Expired GB921428A (en) 1959-12-17 1960-11-11 Static switching systems

Country Status (1)

Country Link
GB (1) GB921428A (en)

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