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)

Similar Documents

Publication Publication Date Title
US3363143A (en) Alternating current switching power contact with soft start and circuit protection
US3222583A (en) Control systems
GB920106A (en) Improvements in or relating to inverters
US3184670A (en) Control system for reversing motor rotation
US3310729A (en) Rectifier circuit
US3207966A (en) Motor control circuit
US3684940A (en) Power amplifier having source of different power capabilities for energizing a servo motor
US3137811A (en) Semiconductor voltage regulator
GB1138906A (en) Electric generator systems and regulators therefor
GB921428A (en) Static switching systems
GB1091846A (en) Electric motor control circuit
US3582740A (en) Reversible speed dc motor controller utilizing resonant field reversal
GB1296230A (en)
GB1076228A (en) Arrangement for the operation of a slip-ring induction motor
GB1056443A (en) Control circuit for a direct-current drive
ES8404923A1 (en) Vehicle propulsion motor control apparatus.
GB902486A (en) A protective circuit arrangement for a transistor switch
ES8200529A1 (en) A commutating device for driving a load.
JPS56121377A (en) Motor driving device
GB1398793A (en) Circuit arrangement for the speed control of electric motors
GB953045A (en) Improvements in and relating to the control of a.c. machines
JPS55157986A (en) Controlling device for dc motor
GB1051628A (en) Improvements in and relating to Electric Circuits for Suppressing Surge Currents
GB1241452A (en) Method of protecting a converter-fed direct-current consuming device from excess currents
GB1379512A (en) Control systems for dc motors