GB1358854A - Control circuit for ac supply circuit - Google Patents

Control circuit for ac supply circuit

Info

Publication number
GB1358854A
GB1358854A GB2995771A GB2995771A GB1358854A GB 1358854 A GB1358854 A GB 1358854A GB 2995771 A GB2995771 A GB 2995771A GB 2995771 A GB2995771 A GB 2995771A GB 1358854 A GB1358854 A GB 1358854A
Authority
GB
United Kingdom
Prior art keywords
voltage
current
thyristors
load
circuit
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
GB2995771A
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of GB1358854A publication Critical patent/GB1358854A/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
    • G05F1/452—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 pulse-burst modulation control
    • 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
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • 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
    • H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current

Abstract

1358854 Automatic voltage and current control LICENTIA PATENT-VERWALTUNGS GmbH 25 June 1971 [25 June 1970 3 Oct 1970] 29957/71 Heading G3R A circuit for controlling the current in a load includes two arrangements for limiting the current through anti-parallel thyristors in series with the load. Normally, switching is for complete cycles, but phase-chopping may be used by one limiting arrangement. In the circuit shown in Fig.1, a heating resistor 4 is supplied with power from a source u w through anti-parallel thyristors 1, 2 controlled by a regulator input 6 producing a control voltage U R which charges a capacitor 8. The voltage U R is opposed by a feedback voltage U g derived from a voltage transformer 11 which senses the load voltage u 4 . The resultant voltage U 8 determines the response time of a Schmitt trigger circuit 12, the output from which is fed to coincidence circuits 13, 13'. These circuits also receive synchronizing signals from pulse generators 14, 14' so that a flip-flop 15 causes firing pulses from a generator 3 to trigger thyristors 1, 2 at the beginning of a cycle. In normal operation, the power to the load is controlled by opening and closing the switch 1, 2 for complete cycles in a ratio determined by the control voltage. The load current is sensed by a transformer 16 connected to a current limiting circuit 20. When the load current exceeds the rated current of the thyristors 1, 2, a diode 18 becomes conductive and varies the charge time of the capacitor 8 in such a manner as to reduce the time for which the thyristors are gated on. A second current limiting stage includes a Zener diode (26) Fig. 2 (not shown). When this diode breaks down, a D.C. voltage is combined with a sawtooth voltage in a flip-flop (27) to produce, through a coincidence circuit 19, a phase delay in the firing pulses from generator 3. The thyristors 1, 2 are thus controlled by phasechopping to provide accurate control at high current levels.
GB2995771A 1970-06-25 1971-06-25 Control circuit for ac supply circuit Expired GB1358854A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19702031439 DE2031439C3 (en) 1970-06-25 1970-06-25 Circuit arrangement for current limitation in an alternating current switch that clocks depending on the control voltage
DE19702048667 DE2048667C3 (en) 1970-06-25 1970-10-03 Circuit arrangement for current limitation in an alternating current switch that clocks depending on the control voltage

Publications (1)

Publication Number Publication Date
GB1358854A true GB1358854A (en) 1974-07-03

Family

ID=25759335

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2995771A Expired GB1358854A (en) 1970-06-25 1971-06-25 Control circuit for ac supply circuit

Country Status (4)

Country Link
DE (2) DE2031439C3 (en)
FR (1) FR2096492B1 (en)
GB (1) GB1358854A (en)
NL (1) NL7108635A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128421A (en) * 1982-10-11 1984-04-26 Douglas Stuart Fenna Power supplies
GB2133590A (en) * 1982-10-19 1984-07-25 Int Standard Electric Corp Switching power supply
GB2134728A (en) * 1983-02-02 1984-08-15 Shell Electric Mfg Ceiling fan
WO1987003713A1 (en) * 1985-12-03 1987-06-18 Engineering Research & Design Pty. Limited Power controller

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2447640A1 (en) * 1979-01-29 1980-08-22 Electricite De France Control circuit for induction heating cooking ring - includes two modulation modes for low and high range operation
US4684876A (en) * 1986-05-27 1987-08-04 Creel Kirby B Voltage regulating device using transistor means for voltage clipping and having load current compensation
DE3931558A1 (en) * 1989-09-22 1990-01-11 Asea Brown Boveri Rectifier loading control circuit in DC=AC converter - uses voltage and current controlled power setting devices with LP filter and PI-controller
US7846311B2 (en) * 2005-09-27 2010-12-07 Abbott Diabetes Care Inc. In vitro analyte sensor and methods of use

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3337773A (en) * 1964-11-06 1967-08-22 Barber Colman Co Overload prevention for control systems
US3447061A (en) * 1965-07-12 1969-05-27 Basic Inc Multi-phase rectifier with inherent phase balance
FR1555827A (en) * 1967-12-15 1969-01-31

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128421A (en) * 1982-10-11 1984-04-26 Douglas Stuart Fenna Power supplies
GB2133590A (en) * 1982-10-19 1984-07-25 Int Standard Electric Corp Switching power supply
GB2134728A (en) * 1983-02-02 1984-08-15 Shell Electric Mfg Ceiling fan
WO1987003713A1 (en) * 1985-12-03 1987-06-18 Engineering Research & Design Pty. Limited Power controller

Also Published As

Publication number Publication date
DE2031439C3 (en) 1975-04-30
NL7108635A (en) 1971-12-28
FR2096492A1 (en) 1972-02-18
DE2048667B2 (en) 1979-03-15
DE2048667C3 (en) 1979-11-15
DE2048667A1 (en) 1972-04-06
DE2031439A1 (en) 1971-12-30
FR2096492B1 (en) 1975-02-07
DE2031439B2 (en) 1974-08-29

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Legal Events

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