GB1257629A - - Google Patents

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Publication number
GB1257629A
GB1257629A GB1257629DA GB1257629A GB 1257629 A GB1257629 A GB 1257629A GB 1257629D A GB1257629D A GB 1257629DA GB 1257629 A GB1257629 A GB 1257629A
Authority
GB
United Kingdom
Prior art keywords
input
voltage
generator
zener diode
duration
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
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 filed Critical
Publication of GB1257629A publication Critical patent/GB1257629A/en
Expired legal-status Critical Current

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Classifications

    • 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
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
    • H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

1,257,629. Pulse modulation circuits. PLESSEY CO. Ltd. 20 March, 1969 [20 Feb., 1968], No. 8318/68. Heading H4L. [Also in Division G3] In a pulse width modulator, the input signal V IN provides a voltage VE via a potentiometer R1 which is combined with a saw-tooth wave V S and supplied to one input Y of a transistorized differential amplifier DA, the other input Z being a reference voltage V R derived through a Zener diode ZD. The Zener diode clamps the voltage V R to the desired value and prevents changes due to temperature variation. When the sum of V S and V E is greater than V R the amplifier provides a constant amplitude output X but the duration of the output signal depends upon the difference between V S plus V E and V R . The input V IN may be inversely dependent upon the terminal voltage of a generator and the duration modulated pulses X used to excite the field of the generator so that the terminal voltage is maintained constant with varying load.
GB1257629D 1968-02-20 1968-02-20 Expired GB1257629A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB831868 1968-02-20

Publications (1)

Publication Number Publication Date
GB1257629A true GB1257629A (en) 1971-12-22

Family

ID=9850240

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1257629D Expired GB1257629A (en) 1968-02-20 1968-02-20

Country Status (1)

Country Link
GB (1) GB1257629A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees