GB917911A - Improvements in or relating to voltage selectors - Google Patents

Improvements in or relating to voltage selectors

Info

Publication number
GB917911A
GB917911A GB3697259A GB3697259A GB917911A GB 917911 A GB917911 A GB 917911A GB 3697259 A GB3697259 A GB 3697259A GB 3697259 A GB3697259 A GB 3697259A GB 917911 A GB917911 A GB 917911A
Authority
GB
United Kingdom
Prior art keywords
input
voltage
voltages
inputs
output
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
GB3697259A
Inventor
Edwin Louis Clarke
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.)
S Smith and Sons Ltd
S Smith and Sons England Ltd
Original Assignee
S Smith and Sons Ltd
S Smith and Sons England 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 S Smith and Sons Ltd, S Smith and Sons England Ltd filed Critical S Smith and Sons Ltd
Priority to GB3697259A priority Critical patent/GB917911A/en
Publication of GB917911A publication Critical patent/GB917911A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0038Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing pulses or pulse trains according to amplitude)
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B1/00Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values
    • G05B1/01Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric
    • G05B1/02Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric for comparing analogue signals
    • G05B1/025Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric for comparing analogue signals using inductance means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Amplifiers (AREA)

Abstract

917,911. Magnetic amplifiers. SMITH & SONS (ENGLAND) Ltd., S. Jan. 18, 1961 [Oct. 30, 1959], No. 36972/59. Class 40 (9). [Also in Group XXXVI] Apparatus selecting the median voltage of magnitude intermediate of those of two other voltages of differing magnitudes comprises a negative feedback amplifier with five inputs and a common output, the first and fifth inputs operating on the amplifier in reverse sense to the second, third and fourth inputs; the first input circuit including a voltage selector selecting the smallest of the three voltages applied to the second, third and fourth inputs; the fifth input circuit including a voltage selector selecting the largest of such three voltages; and means for applying 100% negative feedback from the common output circuit to each input, whereby the median voltage appears at the common output. In Fig. 1 three input voltages A, B, C are applied from corresponding transmission channels to input windings 2, 3, 4 of a magnetic amplifier 7 having 100% negative feedback from its output 8 to its input windings 1 to 5, and input windings 1 and 5 are operating in opposition to windings 2 to 4 are respectively energized from the inputs over pairs of rectifiers 10, 13; 11, 14; 12, 15 in opposed polarity, so that the voltages applied to the windings 1 and 5 are the differences between the output voltage and respectively the smallest and the largest of the four voltages constituted by input voltages A, B, C and the output voltage, and it is shown that for an amplifier with a rectangular characteristic (Fig. 2, not shown) stability is achieved when the input voltage represents the median voltage of the three inputs. In a modification (Fig. 3) the common return of the input windings is connected to the slider of a potentiometer 17 energized from a direct voltage source at least equal to the largest input value, and the potentiometer is adjusted by a motor 18 energized from the magnetic amplifier output so that an increase in output voltage produces an increase in feedback voltage and at stability the slider voltage and position represents the median of the three input voltages. Further input windings and rectifier pairs enable the output to represent the median of four or more inputs (Fig. 4, not shown) and it is shown that the apparatus may then be applied to produce an output equal to the mean of all but the smallest and largest of four or more applied voltages. The inputs may be derived from potentiometers driven by respective mechanical signals, and amplifiers other than magnetic may be used.
GB3697259A 1959-10-30 1959-10-30 Improvements in or relating to voltage selectors Expired GB917911A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3697259A GB917911A (en) 1959-10-30 1959-10-30 Improvements in or relating to voltage selectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3697259A GB917911A (en) 1959-10-30 1959-10-30 Improvements in or relating to voltage selectors

Publications (1)

Publication Number Publication Date
GB917911A true GB917911A (en) 1963-02-06

Family

ID=10392682

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3697259A Expired GB917911A (en) 1959-10-30 1959-10-30 Improvements in or relating to voltage selectors

Country Status (1)

Country Link
GB (1) GB917911A (en)

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