GB858820A - Improvements in or relating to frequency sensitive control circuits - Google Patents

Improvements in or relating to frequency sensitive control circuits

Info

Publication number
GB858820A
GB858820A GB23994/58A GB2399458A GB858820A GB 858820 A GB858820 A GB 858820A GB 23994/58 A GB23994/58 A GB 23994/58A GB 2399458 A GB2399458 A GB 2399458A GB 858820 A GB858820 A GB 858820A
Authority
GB
United Kingdom
Prior art keywords
conductive
transistor
frequency
control device
zener diode
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
GB23994/58A
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 Electric Corp filed Critical Westinghouse Electric Corp
Publication of GB858820A publication Critical patent/GB858820A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B1/00—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values
    • G05B1/01—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric
    • G05B1/02—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric for comparing analogue signals
    • 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
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/16—Controlling the angular speed of one shaft
    • 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
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/42—Arrangements for controlling electric generators for the purpose of obtaining a desired output to obtain desired frequency without varying speed of the generator
    • 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
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/30—Special adaptation of control arrangements for generators for aircraft

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

858,820. Automatic frequency control systems; transistor switching circuits. WESTINGHOUSE ELECTRIC CORPORATION. July 25, 1958 [Aug. 12, 1957], No. 23994/58. Classes 40(5) and 40(6). In an aircraft A.C. supply system the lowest permissible frequency is controlled by a frequency discriminator comprising high- and low-pass filters 6, 7 and 9, 8 whose outputs are rectified and differentially combined to produce a positive or negative output applied to a D.C. amplifier and delay circuit 2, 3, which, for only one polarity of output from the discriminator and after a finite delay actuates a control device for correcting excessive frequency drop of the A.C. generator frequency. The D.C. amplifier 2 may comprise NPN transistors with Zener diodes 25, 26, 27 as D.C. coupling elements, and rectifiers 22, 23 at its input, so that only positive inputs are transmitted through the first transistor and, if so, the Zener diodes 25, 26 are respectively non- conductive and conductive, and the final transistor 29 conductive to short circuit the output capacitor 30 and make Zener diode 27 non- conductive and therefore the control device inoperative. But a negative input disables transistor 20, causing Zener diodes 25 and transistor 24 to become conductive, and blocking Zener diode 26 and transistor 29 so that capacitor 30 charges exponentially to the value rendering Zener diode 27 conductive after a time and energizing the control device.
GB23994/58A 1957-08-12 1958-07-25 Improvements in or relating to frequency sensitive control circuits Expired GB858820A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US858820XA 1957-08-12 1957-08-12

Publications (1)

Publication Number Publication Date
GB858820A true GB858820A (en) 1961-01-18

Family

ID=22194580

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23994/58A Expired GB858820A (en) 1957-08-12 1958-07-25 Improvements in or relating to frequency sensitive control circuits

Country Status (1)

Country Link
GB (1) GB858820A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190256A (en) * 1986-05-09 1987-11-11 Signal Processors Ltd Radio beacon receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190256A (en) * 1986-05-09 1987-11-11 Signal Processors Ltd Radio beacon receiver
GB2190256B (en) * 1986-05-09 1990-04-25 Signal Processors Ltd Radio beacon receiving apparatus

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