Device for the analog/digital conversion of a measuring voltage

A technology for measuring voltage and digital conversion, applied in analog/digital conversion, code conversion, electrical components, etc., can solve the problem of low importance of measurement accuracy
CN1981444AActive Publication Date: 2007-06-13EHNDRESS KHAUZER GMBKH KO KG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
EHNDRESS KHAUZER GMBKH KO KG
Publication Date
2007-06-13

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Abstract

The invention relates to a device for the analog / digital conversion of a measuring voltage (Ue), said device comprising an analog / digital converter (1) provided with an integrator (2) with an operation amplifier (OP1), a resistance (R) and a capacitor (C) in the feedback loop. A reference voltage (Uref) is applied to the inverting input of the operation amplifier (OPI), and the measuring voltage (Ue) is applied to the non-inverting input of the operation amplifier (OPI). The capacitor (C) is charged during a charging phase of the period (t1) and discharged during a discharge phase of the period (t2). The analog / digital converter (1) also comprises a comparator (3) which is mounted downstream from the operation amplifier (OPI), a memory element (4) which is mounted downstream from the comparator (3), a time generator (6) for generating the charging time (tl), and a counter (8), said counter (8) detecting the edges or the duration (T = tl + t2) of the pulsewidth-modulated output signal (Uout) generated at the output by the A / D converter (1). The inventive device is also provided with a synchronisation element (5) that synchronises the edges of the pulsewidth-modulated output signal with the clock pulse of the counter (8) at least over a pre-determined measuring period (X).
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Description

technical field

[0001] The invention relates to a device for analog / digital conversion of measuring voltages. Background technique

[0002] The counting method is a representative method of A / D conversion, that is, converting an analog input voltage into a number proportional to the amplitude. Implementations of the counting method are the single ramp method and the dual ramp method, where only the input voltage is integrated using an integrating element, while in the dual ramp method both the input voltage and the reference voltage are integrated.

[0003] The cycle length of the A / D conversion of the measuring signal is determined by the discharge time t of the capacitor located in the feedback loop of the integrating element 1 and charging time t 2 The sum is determined. The switchover between the charging phase and the discharging phase always takes place at the moment when the output voltage of the integrating element reaches a predetermined threshold voltage. This ...

Claims

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