GB997214A - Control circuits for regulators - Google Patents

Control circuits for regulators

Info

Publication number
GB997214A
GB997214A GB3828060A GB3828060A GB997214A GB 997214 A GB997214 A GB 997214A GB 3828060 A GB3828060 A GB 3828060A GB 3828060 A GB3828060 A GB 3828060A GB 997214 A GB997214 A GB 997214A
Authority
GB
United Kingdom
Prior art keywords
supply
pulses
sawtooth
control
during
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
GB3828060A
Inventor
Kenneth Gordon King
Kenneth Michael Watkins
Richard Martin Fitzwilli Barry
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.)
Siemens Mobility Ltd
Original Assignee
Westinghouse Brake and Signal 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 Westinghouse Brake and Signal Co Ltd filed Critical Westinghouse Brake and Signal Co Ltd
Priority to US150390A priority Critical patent/US3243711A/en
Publication of GB997214A publication Critical patent/GB997214A/en
Expired legal-status Critical Current

Links

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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/081—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters wherein the phase of the control voltage is adjustable with reference to the AC source
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/257—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
    • H02M5/2573—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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 control circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Dc-Dc Converters (AREA)
  • Electrotherapy Devices (AREA)

Abstract

997,214. Transistor oscillating circuits. WESTINGHOUSE BRAKE & SIGNAL CO. Oct. 27, 1961 [Nov. 8, 1960], No. 38280/60. Heading H3T. A control circuit for an A.C. regulator which incorporates a SCR, produces trains of firing pulses having a repetition frequency much higher than the A.C. supply, or in the form of extended pulses derived from the trains. In a first embodiment, Fig. 3, the control circuit is supplied from an A.C. supply in synchronism with the A.C. supply to the regulator. Four rectifiers MR1-MR4 are arranged to provide the D.C. supply for the circuit and also to supply control voltages for transistor VT1, via resistors Rl, R2. During most of the A.C. cycle the control voltage at the base of VT1 is negative, holding VT1 conducting and diode MRS cut off, thus allowing capacitor C2 to charge exponentially through resistor R6. At the instant when the A.C. signal passes through zero, VT1 is cut off, diode MR5 conducts and capacitor C2 discharges through resistor R4 producing a sawtooth signal synchronized with the incoming A.C., and at twice its frequency. The sawtooth produced is used to switch on and off transistor VT2, the point in the cycle at which switching occurs being determined by a D.C. control signal applied at terminals e, f. Switching of VT2 in turn controls a blocking oscillator stage VT3 to produce trains of pulses of predetermined duration, Fig. 5, which are used to fire the rectifiers in the control circuit. The pulses are lengthened or completely smoothed by rectifiers MR7, MR8 and capacitors C5, C6 in the output circuits. In a modification. Fig. 8, the stages comprising transistors VT2, VT3 are duplicated by similar stages VT4, VT5 and blocking pulses are provided by the bridge MB1-MR4 which block VT2, VT4 alternately on alternative half cycles. Thus, the pulse brain is produced at output gh during one half cycle, and at output jk during the subsequent half cycle. In a further embodiment, Figs. 10, 11, during the period where VT1 is cut off capacitor C2 charges to a potential determined by Zener diode D7. The sawtooth and D.C. control are mixed via the base-emitter circuit of VT4, the resulting sawtooth being amplified by VT5. The output from VT5 is split and fed to two blocking oscillator stages VT6, VT7 the bases of which are held positive on alternate half cycles by transistors VT2, VT3.
GB3828060A 1960-11-08 1960-11-08 Control circuits for regulators Expired GB997214A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US150390A US3243711A (en) 1960-11-08 1961-11-06 Control circuit for regulators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW0031011 1961-11-06

Publications (1)

Publication Number Publication Date
GB997214A true GB997214A (en) 1965-07-07

Family

ID=7599664

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3828060A Expired GB997214A (en) 1960-11-08 1960-11-08 Control circuits for regulators

Country Status (2)

Country Link
DE (1) DE1438647B2 (en)
GB (1) GB997214A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100459431C (en) * 2003-07-08 2009-02-04 艾斯泰克国际公司 Circuit for optimizing Zener diode bias current

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100459431C (en) * 2003-07-08 2009-02-04 艾斯泰克国际公司 Circuit for optimizing Zener diode bias current

Also Published As

Publication number Publication date
DE1438647A1 (en) 1968-12-19
DE1438647B2 (en) 1973-01-04

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