GB1124660A - A circuit device for step-by-step control of an electrical voltage - Google Patents

A circuit device for step-by-step control of an electrical voltage

Info

Publication number
GB1124660A
GB1124660A GB12936/66A GB1293666A GB1124660A GB 1124660 A GB1124660 A GB 1124660A GB 12936/66 A GB12936/66 A GB 12936/66A GB 1293666 A GB1293666 A GB 1293666A GB 1124660 A GB1124660 A GB 1124660A
Authority
GB
United Kingdom
Prior art keywords
digital
resistors
switches
resistor
secondary winding
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
GB12936/66A
Inventor
Johan Krister Karlstrom
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.)
INGENJORS N EL AUTOMATIK FA AB
Original Assignee
INGENJORS N EL AUTOMATIK FA AB
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 INGENJORS N EL AUTOMATIK FA AB filed Critical INGENJORS N EL AUTOMATIK FA AB
Priority to GB12936/66A priority Critical patent/GB1124660A/en
Publication of GB1124660A publication Critical patent/GB1124660A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
    • G01G3/142—Circuits specially adapted therefor
    • G01G3/145—Circuits specially adapted therefor involving comparison with a reference value
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/14—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

1,124,660. Digital to analogue converters. INGENJORSFIRMAN EL - AUTOMATIK A.B. 23 March, 1966, No. 12936/66. Heading G4H. A digital-to-analogue converter comprises a reference resistor Ra, Fig. 2, across which the output voltage is produced and a group of resistors R 1 -R 12 connected at one end to a voltage source, there being for each resistor a two-way switch O 1 -O 12 arranged to connect the corresponding resistor to the reference resistor Ra or to a further resistor Rb of equal value. The load on the supply is therefore always the same irrespective of how many switches are operated. Two groups of switched resistors may be provided producing signals over resistors Ra and Re connected in series. The supply is taken from the first secondary winding S 1 of a transformer T. A second secondary winding S 2 supplies a measuring bridge B which produces a signal representing, for example, a weight. This is applied to one end of a transformer winding P', while the output from the digital-to-analogue converter is applied to the other. The secondary winding S<SP>1</SP> gives a signal proportional to the difference. A series of resistors R 25 -R 34 are provided, controlled by switches, to introduce a bias to compensate for the time taken for the mechanism to respond to the error signal. In the case of an automatic concrete mixer, the digital-to-analogue converter switches may be controlled by a record and the bridge B by the weight of tho ingredients. The hopper flap does not close instantly a balance is achieved, and the switches O 30 -O 34 are adjusted so that it begins to close before a true balance has been reached.
GB12936/66A 1966-03-23 1966-03-23 A circuit device for step-by-step control of an electrical voltage Expired GB1124660A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB12936/66A GB1124660A (en) 1966-03-23 1966-03-23 A circuit device for step-by-step control of an electrical voltage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB12936/66A GB1124660A (en) 1966-03-23 1966-03-23 A circuit device for step-by-step control of an electrical voltage

Publications (1)

Publication Number Publication Date
GB1124660A true GB1124660A (en) 1968-08-21

Family

ID=10013858

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12936/66A Expired GB1124660A (en) 1966-03-23 1966-03-23 A circuit device for step-by-step control of an electrical voltage

Country Status (1)

Country Link
GB (1) GB1124660A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2116797A (en) * 1982-02-23 1983-09-28 Burr Brown Res Corp A circuit for improving the performance of digital to analog converters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2116797A (en) * 1982-02-23 1983-09-28 Burr Brown Res Corp A circuit for improving the performance of digital to analog converters
US4567463A (en) * 1982-02-23 1986-01-28 Burr-Brown Corporation Circuit for improving the performance of digital to analog converters

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