BE904066A - Direct digital measurement of DC voltage - using simple programmed sequence so enable direct reading by computer via MOS buffer amplifier - Google Patents

Direct digital measurement of DC voltage - using simple programmed sequence so enable direct reading by computer via MOS buffer amplifier Download PDF

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Publication number
BE904066A
BE904066A BE0/216152A BE216152A BE904066A BE 904066 A BE904066 A BE 904066A BE 0/216152 A BE0/216152 A BE 0/216152A BE 216152 A BE216152 A BE 216152A BE 904066 A BE904066 A BE 904066A
Authority
BE
Belgium
Prior art keywords
circuit
voltage
capacitor
bidirectional electronic
electronic circuit
Prior art date
Application number
BE0/216152A
Other languages
Dutch (nl)
Inventor
J A Peperstraete
Original Assignee
Univ Leuven Kath
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 Univ Leuven Kath filed Critical Univ Leuven Kath
Priority to BE0/216152A priority Critical patent/BE904066A/en
Publication of BE904066A publication Critical patent/BE904066A/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/255Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques using analogue/digital converters of the type with counting of pulses during a period of time proportional to voltage or current, delivered by a pulse generator with fixed frequency

Abstract

Method for the digital conversion of an electrical voltage which consists of combining the electrical voltage to be measured with a capacitor (2) and a resistor (1). These are connected to a single measuring terminal (4) and the ground conductor of a measuring circuit (5). It must be possible to switch the measuring terminal as both input (7) and output terminal (6); as input terminal (7) it must have a threshold value so that the circuit can react differently according to whether the value of the electrical input voltage is above or below this threshold value.

Description


   <Desc / Clms Page number 1>
 



   DESCRIPTION associated with a
INVENTION PATENT APPLICATION in the name of
Katholieke Universiteit Leuven (inventor: Prof. J. A. Peperstraete) for "Method for the digital conversion of an electrical voltage"

 <Desc / Clms Page number 2>

 
This invention relates to a method for the digital conversion of an electrical voltage.



   The object of the invention is via a single input or output terminal of a digital circuit or of a computer, and without the use of an AC / DC or DC / AC converter, integrated circuits or voltage amplifiers or comparators, of a digital measurement of a electrical voltage.



   In order to realize this according to the invention, the method according to the invention consists in applying the electrical voltage to be converted to a capacitor, in series through a resistor connected in series, to connect this capacitor in series with a controlled bidirectional electronic circuit. at the input of a counting measuring circuit or a circuit programmed as such, wherein the bi-directional electronic circuit has a certain threshold value at its terminal connected to the capacitor, when this terminal forms the input terminal of the circuit; control the bidirectional electronic circuit so that it becomes conductive from the above-mentioned measuring circuit to the capacitor;

   have the counting measuring circuit or a circuit programmed as such apply a voltage to the bidirectional electronic circuit, which voltage has a value which makes the voltage at the terminals of the capacitor lower than that of the threshold referred to above, afterwards the bidirectional electronic circuit. control that it becomes conductive from the capacitor to the count measuring circuit or a circuit programmed as such and by starting this circuit a counting procedure, the capacitor meanwhile charging in the voltage value to be converted and the

 <Desc / Clms Page number 3>

 counting procedure ends when the voltage at the terminals of the capacitor exceeds the above threshold value of the terminal of the bidirectional circuit to which the capacitor is connected,

   and the result of the counting procedure is a numerical value representing a measure of the voltage to be converted.



   According to a possible embodiment, the above-mentioned bidirectional electronic circuit is a gate circuit.



   According to another embodiment, the above-mentioned bidirectional electronic circuit is a buffer amplifier.



   Other details and advantages of the invention will become apparent from the following description of a method for the digital conversion of an electrical voltage according to the invention. This description is given by way of example only and does not limit the invention. The reference numbers refer to the appended figure.



   The figure is a block diagram of the circuit for carrying out the method according to the invention.



   The electrical voltage Vx to be measured is connected in series with a resistor 1 to a capacitor 2. This resistance can be the internal resistance of the voltage source Vx itself. The capacitor is connected in series with a bidirectional electronic buffer or amplifier circuit 3 between the measuring terminal 4 and the grounding conductor of the measuring circuit 5.



   If the terminal 6 of the bidirectional circuit, which is connected to the capacitor 2, is connected as an input terminal, it must have a threshold value, so that the circuit can react differently according to whether the value of the electric input voltage is above or below this threshold value.



   The measurement procedure is as follows: the bidirectional circuit is controlled in the state where terminal 7 functions as input terminal and terminal 6 functions as output terminal;

 <Desc / Clms Page number 4>

 the measuring circuit 5 now starts a counting procedure.



  Meanwhile, capacitor 2 charges with the voltage Vx to be measured.



  The counting procedure is stopped when the voltage across the capacitor 2 exceeds the threshold of the input terminal 6. The result of the count is a number that is a measure of the electrical voltage value Vx. This method makes it possible to use a single input or output terminal of a digital circuit or a computer, and without using AC / DC or DC / AC converters integrated circuits or comparators, a direct digital measurement of an electrical voltage to be carried out.



   The only additional components are a capacitor 2 and a fixed resistor 1 which together determine a time constant of charging. At the start of a measuring cycle, the capacitor is discharged by the measuring circuit, after which the voltage to be measured can charge the capacitor back via the fixed resistor 1.



   The input threshold of the input circuit is used as the threshold detecting element. When using the MOS technology, the threshold of the input transistor over a wide temperature range is quite constant.



   The possible applications are mainly situated where measurements of electrical voltages up to accuracies with a maximum tolerance of 1% are required, such as: - digital measurement of electrical voltages from all kinds of sensors: photocells, pH measurements, frequency and voltage converters, speed and acceleration measurements, power measurements etc.



   - protect against power failure.



   This method is particularly advantageous for computer circuits: programmable input and output terminals can be provided while the program required to proceed with measurements is exceptionally short; a dozen instructions can do this.

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   It is clear that the invention is not limited to the above-described embodiment and that many changes could be made to it without departing from the scope of the patent application.

Claims (4)

  1. CONCLUSIONS Method for the digital conversion of an electric voltage, characterized in that it consists in applying, through a resistor connected in series, the electric voltage to be converted to a capacitor, connecting this capacitor in series with a controlled bidirectional electronic circuit, at the input of a counting measuring circuit or a circuit programmed as such, wherein the bidirectional electronic circuit at its terminal connected to the capacitor, when this terminal forms the input terminal of the circuit, has a certain threshold value; control the bidirectional electronic circuit so that it becomes conductive from the above-mentioned measuring circuit to the capacitor;
     to have the counting measuring circuit or a circuit programmed as such apply a voltage to the bidirectional electronic circuit, the voltage having a value whereby the voltage at the terminals of the capacitor becomes lower than that of the above-mentioned threshold; thereafter to control the bidirectional electronic circuit so that it becomes conductive from the capacitor to the count measuring circuit or a circuit programmed as such and by starting this circuit a counting procedure, the capacitor meanwhile charging in the voltage value to be converted and the counting procedure ends when the voltage at the terminals of the capacitor is the above-mentioned threshold value of the terminal of the bidirectional circuit to which the capacitor is connected,
     and the result of the counting procedure is a numerical value representing a measure of the voltage to be converted.
  2.  Method according to claim 1, characterized in that the above-mentioned bidirectional electronic circuit is a gate circuit.
  3.  Method according to claim 1, characterized in that the above-mentioned bidirectional electronic circuit is a buffer amplifier.  <Desc / Clms Page number 7>  
  4.  Method according to any one of claims 1 to 3, characterized in that the above-mentioned bidirectional electronic circuit is a circuit in MOS technology, the above-mentioned input threshold of which is formed by the input threshold of the input transistor of this circuit.
BE0/216152A 1986-01-20 1986-01-20 Direct digital measurement of DC voltage - using simple programmed sequence so enable direct reading by computer via MOS buffer amplifier BE904066A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
BE0/216152A BE904066A (en) 1986-01-20 1986-01-20 Direct digital measurement of DC voltage - using simple programmed sequence so enable direct reading by computer via MOS buffer amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE0/216152A BE904066A (en) 1986-01-20 1986-01-20 Direct digital measurement of DC voltage - using simple programmed sequence so enable direct reading by computer via MOS buffer amplifier

Publications (1)

Publication Number Publication Date
BE904066A true BE904066A (en) 1986-05-15

Family

ID=3843973

Family Applications (1)

Application Number Title Priority Date Filing Date
BE0/216152A BE904066A (en) 1986-01-20 1986-01-20 Direct digital measurement of DC voltage - using simple programmed sequence so enable direct reading by computer via MOS buffer amplifier

Country Status (1)

Country Link
BE (1) BE904066A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012130990A1 (en) * 2011-03-29 2012-10-04 Continental Teves Ag & Co. Ohg Device for measuring a supply voltage in electric vehicles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012130990A1 (en) * 2011-03-29 2012-10-04 Continental Teves Ag & Co. Ohg Device for measuring a supply voltage in electric vehicles
CN103534600A (en) * 2011-03-29 2014-01-22 大陆-特韦斯贸易合伙股份公司及两合公司 Device for measuring a supply voltage in electric vehicles
US9239342B2 (en) 2011-03-29 2016-01-19 Continental Teves Ag & Co. Ohg Device for measuring a supply voltage in electric vehicles

Also Published As

Publication number Publication date
BE904066A2 (en)

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Legal Events

Date Code Title Description
RE Lapsed

Owner name: KATHOLIEKE UNIVERSITEIT LEUVEN

Effective date: 19920131