GB1361184A - Switching circuits especially for shunt-wound motors - Google Patents

Switching circuits especially for shunt-wound motors

Info

Publication number
GB1361184A
GB1361184A GB4630170A GB4630170A GB1361184A GB 1361184 A GB1361184 A GB 1361184A GB 4630170 A GB4630170 A GB 4630170A GB 4630170 A GB4630170 A GB 4630170A GB 1361184 A GB1361184 A GB 1361184A
Authority
GB
United Kingdom
Prior art keywords
scr
triac
current
voltage
load
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
GB4630170A
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.)
Mpac Group PLC
Original Assignee
Molins Ltd
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 Molins Ltd filed Critical Molins Ltd
Priority to GB4630170A priority Critical patent/GB1361184A/en
Publication of GB1361184A publication Critical patent/GB1361184A/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
    • H03K17/722—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 with galvanic isolation between the control circuit and the output circuit
    • H03K17/723—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 with galvanic isolation between the control circuit and the output circuit using transformer coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/03—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors
    • H02P7/04—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors by means of a H-bridge circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

1361184 Converting, control of D.C. motors MOLINS Ltd 28 Sept 1971 [29 Sept 1970] 46301/70 Headings H2F and H2J [Also in Division H3] A switching circuit for applying a reversible direct voltage to an inductive load, e.g. the field windings of shunt motor, from an A.C. supply comprises: a rectifier circuit 10; a bridge of four controlled switches, SCR's 12A, 12B through which the direct voltage is applied to the load in either direction; and means, e.g. triac 14, in the A.C. part of the circuit for limiting the rise in current when the direction of current through the load is reversed. If initially SCR's 12A are conductive and it is desired to change the direction of the voltage by firing SCR's 12B, then triac 14 is extinguished long enough for the currents through SCR's 12A to decay sufficiently for them to become extinguished. Pulses are then applied to the coils B to refire triac 14, and fire SCR's 12B. In an alternative arrangement the trial is replaced by a filament lamp. When it is desired to change the direction of the voltage SCR's 12B are fired and the lamp limits the supply current during the time that all four SCR's are on, until the current decays through SCR's 12A sufficiently for them to extinguish.
GB4630170A 1971-09-28 1971-09-28 Switching circuits especially for shunt-wound motors Expired GB1361184A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4630170A GB1361184A (en) 1971-09-28 1971-09-28 Switching circuits especially for shunt-wound motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4630170A GB1361184A (en) 1971-09-28 1971-09-28 Switching circuits especially for shunt-wound motors

Publications (1)

Publication Number Publication Date
GB1361184A true GB1361184A (en) 1974-07-24

Family

ID=10440682

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4630170A Expired GB1361184A (en) 1971-09-28 1971-09-28 Switching circuits especially for shunt-wound motors

Country Status (1)

Country Link
GB (1) GB1361184A (en)

Similar Documents

Publication Publication Date Title
IL65485A (en) Pulsed thyristor trigger control circuit for power factor control of induction motors
GB1272178A (en) Improvements in or relating to circuit arrangements for stabilising and igniting welding arcs
CA1018251A (en) Laser current control circuit
ZA724881B (en) Electrical circuit for controlling the energization of an inductive load
GB1361184A (en) Switching circuits especially for shunt-wound motors
CA1021392A (en) Bridge circuit for controlling a direct current motor
AU3197471A (en) Series motor control circuit using thyristors energized by direct current
GB1427836A (en) Dynamic brake and power supply for dc-motors
GB1299523A (en) Electric system for operating a gas discharge lamp
GB1199660A (en) Improved Contactor Operating Circuit
GB1066092A (en) Method of controlling the d.c. output of rectifiers
GB1416681A (en) Electric motor control apparatus
SU439062A1 (en) CURRENT PULSE FORMER
GB1142789A (en) Arrangement for controlling a direct current by means of resistors
JPS51121721A (en) Controlling system electric motor controller
GB1341480A (en) Contactor for three-phase load
GB1098459A (en) Improvements relating to static inverters
CA775238A (en) Circuit for controlling energization of a direct current load
GB1324100A (en) Three phase current control system
JPS5264714A (en) Apparatus for controlling thyristor chopper for electric automobile
CA791263A (en) Pulse width modulation control systems for controlling direct current motors
CA1010949A (en) Control circuit for direct current motor
AU489957B2 (en) Alternating current control circuits
JPS5282180A (en) Circuit for controlling thyristor
SE7409874L (en)

Legal Events

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