GB1389402A – Variable mark space ratio pulse controllers
– Google Patents
GB1389402A – Variable mark space ratio pulse controllers
– Google Patents
Variable mark space ratio pulse controllers
Info
Publication number
GB1389402A
GB1389402A
GB1496371A
GB1496371A
GB1389402A
GB 1389402 A
GB1389402 A
GB 1389402A
GB 1496371 A
GB1496371 A
GB 1496371A
GB 1496371 A
GB1496371 A
GB 1496371A
GB 1389402 A
GB1389402 A
GB 1389402A
Authority
GB
United Kingdom
Prior art keywords
thyristor
capacitor
current
commutating
conductive
Prior art date
1971-05-14
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
GB1496371A
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.)
Sevcon Ltd
Original Assignee
Sevcon 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.)
1971-05-14
Filing date
1971-05-14
Publication date
1975-04-03
1971-05-14
Application filed by Sevcon Ltd
filed
Critical
Sevcon Ltd
1971-05-14
Priority to GB1496371A
priority
Critical
patent/GB1389402A/en
1972-05-09
Priority to US00251821A
priority
patent/US3751677A/en
1975-04-03
Publication of GB1389402A
publication
Critical
patent/GB1389402A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
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
H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation
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
H02M3/00—Conversion of dc power input into dc power output
H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
H02M3/125—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
H02M3/135—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10S388/00—Electricity: motor control systems
Y10S388/907—Specific control circuit element or device
Y10S388/917—Thyristor or scr
Abstract
1389402 Control of D.C. motors SEVCON Ltd 12 May 1972 [14 May 1971] 14963/71 Heading H2J [Also in Division H3] A commutating circuit for a main thyristor 5 of a mark-space ratio controller (shown connected to a motor load 7, 8) comprises a commutating thyristor and capacitor circuit 15, 17 and a third thyristor 19 for reversing the charge on the commutating capacitor, the firing cycles of the commutating and which thyristors occurring automatically in response the triggering of the main thyristor. When first switching on the circuit shown, thyristor 15 is rendered momentarily conductive by gate current through the load and members 21, 25, 27 so that the capacitor charges. When the main thyristor is triggered and becomes conductive gate current via diode 29 renders 19 conductive and resonant reversal of the charge on capacitor 17 takes place through 21 and 5 whereupon 19 becomes non-conductive. Current now flows through inductor 21 and the gate of 15 into capacitor 17 causing thyristor 15 to conduct and extinguish the main thyristor. Switches 10, 12 reverse the connections of the field winding 8 to reverse the motor. Diodes 9 and 11 are for “plugging” and “freewheeling” and inductor 13 reduces the rate of size of current in 27. Resistor 31 and diode 29 in the gate circuit of 19 may be omitted (Fig. 2, not shown) and firing pulses obtained from a winding coupled to winding 21, a current from the latter being obtained from a resistor (39) in parallel with thyristor 19. Alternatively the firing pulses for 19 may be obtained from a winding coupled to the anode or cathode current path of the main thyristor (41, Fig. 3, not shown).
GB1496371A
1971-05-14
1971-05-14
Variable mark space ratio pulse controllers
Expired
GB1389402A
(en)
Priority Applications (2)
Application Number
Priority Date
Filing Date
Title
GB1496371A
GB1389402A
(en)
1971-05-14
1971-05-14
Variable mark space ratio pulse controllers
US00251821A
US3751677A
(en)
1971-05-14
1972-05-09
Variable mark space ratio pulse controllers
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB1496371A
GB1389402A
(en)
1971-05-14
1971-05-14
Variable mark space ratio pulse controllers
Publications (1)
Publication Number
Publication Date
GB1389402A
true
GB1389402A
(en)
1975-04-03
Family
ID=10050649
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1496371A
Expired
GB1389402A
(en)
1971-05-14
1971-05-14
Variable mark space ratio pulse controllers
Country Status (2)
Country
Link
US
(1)
US3751677A
(en)
GB
(1)
GB1389402A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2136227A
(en)
*
1983-03-07
1984-09-12
Nat Res Dev
Direct Current Circuit Breakers
US4686393A
(en)
*
1984-02-01
1987-08-11
National Research Development Corporation
Circuit breakers for direct and alternating current
Families Citing this family (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB1491339A
(en)
*
1975-04-08
1977-11-09
Sevcon Ltd
Pulse controllers
DE2657920C2
(en)
*
1976-12-21
1982-05-13
Robert Bosch Gmbh, 7000 Stuttgart
Drive for a walking transport device
Family Cites Families (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB1048997A
(en)
*
1963-10-05
1966-11-23
Sevcon Engineering Company
Improvements in or relating to control means for electrical apparatus
1971
1971-05-14
GB
GB1496371A
patent/GB1389402A/en
not_active
Expired
1972
1972-05-09
US
US00251821A
patent/US3751677A/en
not_active
Expired – Lifetime
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB2136227A
(en)
*
1983-03-07
1984-09-12
Nat Res Dev
Direct Current Circuit Breakers
US4686393A
(en)
*
1984-02-01
1987-08-11
National Research Development Corporation
Circuit breakers for direct and alternating current
Also Published As
Publication number
Publication date
US3751677A
(en)
1973-08-07
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Legal Events
Date
Code
Title
Description
1975-08-13
PS
Patent sealed [section 19, patents act 1949]
1977-12-07
PLNP
Patent lapsed through nonpayment of renewal fees
