GB1275764A - Improvements in control systems - Google Patents

Improvements in control systems

Info

Publication number
GB1275764A
GB1275764A GB3682269A GB3682269A GB1275764A GB 1275764 A GB1275764 A GB 1275764A GB 3682269 A GB3682269 A GB 3682269A GB 3682269 A GB3682269 A GB 3682269A GB 1275764 A GB1275764 A GB 1275764A
Authority
GB
United Kingdom
Prior art keywords
amplifier
control
output
capacitor
charge
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
GB3682269A
Inventor
John Desmond Ainsworth
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.)
English Electric Co Ltd
Original Assignee
English Electric Co 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 English Electric Co Ltd filed Critical English Electric Co Ltd
Priority to GB3682269A priority Critical patent/GB1275764A/en
Publication of GB1275764A publication Critical patent/GB1275764A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/505—Conversion of dc power input into ac power output without possibility of reversal 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
    • H02M7/515—Conversion of dc power input into ac power output without possibility of reversal 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
    • H02M7/525—Conversion of dc power input into ac power output without possibility of reversal 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 with automatic control of output waveform or frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

1275764 Automatic control of converters ENGLISH ELECTRIC CO Ltd 13 Oct 1970 [22 July 1969] 36822/69 Heading G3R [Also in Divisions H2 and H3] In a control system e.g. for controlling gridcontrol converters, including a plurality of separate circuits having a common output v#α, only a selected one of said control circuits being operative at any instant, each control circuit includes an amplifier 1, 2 having a feedback capacitor C1, C2 and means connected to said amplifier and effective when the amplifier is inoperative to maintain the charge on the capacitor at substantially the same level as that on the capacitor in the operative one of said circuits. The upper circuit may form part of a constantcurrent control of an inverter whilst the lower circuit may provide constant extinction angle in the inverter. Assuming the amplifier 1 has a more negative output than amplifier 2, transistor TR1 will be saturated so as to pass the output from amplifier 1 to the output V½ α and to hold diode D1 cut-off. Diode D2 prevents the voltage difference via R3, R4 driving the output of amplifier 2 positive, hence a small current is maintained in transistor TR2, hence the baseemitter voltage of TR2 is only slightly below that of TR1, so that the charge on C2 is maintained substantially equal to that of C1. The invention prevents system failure due to the time taken for the feedback capacitor C1 or C2 to correct its charge following a changeover in control systems.
GB3682269A 1969-07-22 1969-07-22 Improvements in control systems Expired GB1275764A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3682269A GB1275764A (en) 1969-07-22 1969-07-22 Improvements in control systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3682269A GB1275764A (en) 1969-07-22 1969-07-22 Improvements in control systems

Publications (1)

Publication Number Publication Date
GB1275764A true GB1275764A (en) 1972-05-24

Family

ID=10391455

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3682269A Expired GB1275764A (en) 1969-07-22 1969-07-22 Improvements in control systems

Country Status (1)

Country Link
GB (1) GB1275764A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136610A (en) * 1983-02-09 1984-09-19 Ass Elect Ind Multiple loop convertor control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136610A (en) * 1983-02-09 1984-09-19 Ass Elect Ind Multiple loop convertor control
US4558405A (en) * 1983-02-09 1985-12-10 Associated Electrical Industries Limited Multi-loop control system for an ac/dc converter employing mode switching

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee