GB1132476A – Thyristor-controlled power supply system
– Google Patents
GB1132476A – Thyristor-controlled power supply system
– Google Patents
Thyristor-controlled power supply system
Info
Publication number
GB1132476A
GB1132476A
GB3126266A
GB3126266A
GB1132476A
GB 1132476 A
GB1132476 A
GB 1132476A
GB 3126266 A
GB3126266 A
GB 3126266A
GB 3126266 A
GB3126266 A
GB 3126266A
GB 1132476 A
GB1132476 A
GB 1132476A
Authority
GB
United Kingdom
Prior art keywords
current
transistor
capacitor
circuit
terminal
Prior art date
1966-07-12
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
GB3126266A
Inventor
John Denis Morris
Guy Mason
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.)
HIRST ELECTRIC IND Ltd
Original Assignee
HIRST ELECTRIC IND 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.)
1966-07-12
Filing date
1966-07-12
Publication date
1968-11-06
1966-07-12
Application filed by HIRST ELECTRIC IND Ltd
filed
Critical
HIRST ELECTRIC IND Ltd
1966-07-12
Priority to GB3126266A
priority
Critical
patent/GB1132476A/en
1968-11-06
Publication of GB1132476A
publication
Critical
patent/GB1132476A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G05—CONTROLLING; REGULATING
G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
G05F1/10—Regulating voltage or current
G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
G05F1/40—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
G05F1/44—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only
G05F1/45—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load
G05F1/455—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load with phase control
Abstract
1,132,476. Automatic control of current and voltage. HIRST ELECTRIC INDUSTRIES Ltd. May 24, 1967 [July 12, 1966], No.31262/66. Heading G3R. In a thyristor-controlled power supply system of the type in which firing pulses for phase-angle regulation of the thyristors are derived from a circuit responsive to output voltage and current variations, and wherein, for protective purposes, voltage control is superseded by current control when the output current exceeds a predetermined level, there is provided a further circuit which protects the system and a connected load such as a transformer-rectifier supplying a magnetron, against the excessive initial inrush of current which can occur when the power is first switched on. As shown, a voltage-monitor signal is applied to an input terminal 11 and at point 13 is compared with a reference signal derived from a circuit 14-18 the resulting error signal being applied to the base of a first transistor 20 which controls further transistors 30, 33, 36 to produce at terminal 39 an appropriate firing pulse for the thyristors of the system (not shown); in addition, a current-monitor signal is applied to terminal 21 and is compared at point 24 with a reference signal derived from circuit 25, 26, the point 24 being the junction between resistors 23 and 27 which are associated as shown with respective capacitors 22′, 26′. The signal at point 24 supplied to the base of a second transistor 28 which is thus held off, the transistor 28 becoming conductive only on the occurrence of a current-monitor signal corresponding to an excess output current, the transistors 30, 33 and 36 then being controlled by transistor 28 to produce at terminal 39 a firing pulse which will decrease the output of the controlled thyristors. The current limiting thus effected takes place relatively slowly, e.g. in about one tenth of a second, and would not prevent with sufficient rapidity the occurrence of an excessive initial inrush current; accordingly, there is provided a further protective circuit constituted by a relay 45, preferably a reed relay, having a normally closed contact 45′ in series with a low valued resistor 46 shortcircuiting the capacitor 26′, the relay 45 being energized only when the controlled A. C. is switched on. Thus, capacitor 26′ is fully discharged when the A. C. is switched on and the contact 45′ opens, and it thereafter charges with a time constant dependent on its capacity and on the value of resistor 26. This time constant is arranged to be greater than that for the capacitor 22′; the slow charging of capacitor 26′ is equivalent to switching on the A.C. supply with the current-reference source 25, 26 set to limit the current to zero and thereafter slowly adjusting potentiometer 25 until it reaches the setting at which it is actually set. Thus, excessive inrush current at switch-on is prevented. A further relay 47, with a normallyopen contact 47′ connected across a capacitor 43 in a negative feedback path from terminal 39 to the base of transistor 28, is energized when the current-monitor signal exceeds a second, higher, predetermined level, contact 47′ then closing to short-circuit capacitor 43 so that transistor 28 is biased hard on in a very short time, e.g. two milliseconds; this arrangement protects the system from sudden overloads produced, for example, by a short circuit in the load.
GB3126266A
1966-07-12
1966-07-12
Thyristor-controlled power supply system
Expired
GB1132476A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB3126266A
GB1132476A
(en)
1966-07-12
1966-07-12
Thyristor-controlled power supply system
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB3126266A
GB1132476A
(en)
1966-07-12
1966-07-12
Thyristor-controlled power supply system
Publications (1)
Publication Number
Publication Date
GB1132476A
true
GB1132476A
(en)
1968-11-06
Family
ID=10320473
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB3126266A
Expired
GB1132476A
(en)
1966-07-12
1966-07-12
Thyristor-controlled power supply system
Country Status (1)
Country
Link
GB
(1)
GB1132476A
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
EP3116080A1
(en)
2015-07-08
2017-01-11
Vestel Elektronik Sanayi ve Ticaret A.S.
A high efficiency limiter circuit
1966
1966-07-12
GB
GB3126266A
patent/GB1132476A/en
not_active
Expired
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
EP3116080A1
(en)
2015-07-08
2017-01-11
Vestel Elektronik Sanayi ve Ticaret A.S.
A high efficiency limiter circuit
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