SU822346A1 - Analogue-digital converter - Google Patents

Description

one

The invention relates to automation and can be used in measuring devices and automatic control systems.

A analog-to-digital converter is known, built on the principle of using an integrating commutative circuit, containing a ring switch, on one diagonal of which an input signal is fed, another diagonal of the switch is connected to an integrator based on the use of storage capacitors. A voltage is applied to the integrator to the voltage converter in the code and to the recorder. The converter is powered by the alternating voltage of a rectangular shape f. The disadvantage of this converter is that it can only be used to convert the inductance imbalance.

The purpose of the invention is to expand the functionality, namely, to enable the conversion of both the imbalance dB and the imbalance of active resistances l.

The goal is achieved by the fact that a pulse counter whose information input is entered into a known analog-to-digital converter containing a rectangular voltage source, a ring switch, two active inductive arms, an integrator, a voltage converter in the code and a recorder.

0 is connected to a rectangular voltage source, and its control input is from an integrator output.

FIG. 1 shows a block diagram of an analog-to-digital converter for converting the unbalance of inductances dB and active resistance RJ in FIG. 2 is a timing diagram of the formation of the output signals.

0

 The converter includes two unbalanced active-inductive arms 1 and 2 connected to two nodes of one diagonal of the ring switch 3 / to the other diagonal.

Claims (2)

5 of which the integrator 4, containing two storage capacitors, is connected to the output of the integrator 4, a voltage converter 5 is connected to a code and the recorder 6; The source 7 of the rectangular voltage is connected to the active-inductive arms 1 and 2, as well as to the operating circuit of the pulse counter 8, which is connected to the integrator 4 by its control circuit. The alternating voltage of the rectangular form U UgSign Sin (cot) produced source 7, provides for active-inductive shoulders 1 and 2 currents i, j and 12. These currents are also determined by the voltages V and V formed at the beginning of each switching period at the storage capacitors of integrator 4. The law of change of current c is also determined by the parameters R ib of active-inductive arm 1, and the current 2 by parameters Rj z 2. At the moments of changing the direction of the currents i and in, the switches of the ring switch 3 are switched. The mode of operation of the ring switch provides the following: current 1 of the positive direction charges one of the storage capacitors, and the current ig of the negative direction discharges this capacitor V; The current C of the negative direction discharges another accumulative capacitance, and the current ig of the positive direction charges this capacitance, forming a voltage V2 on it. After each period of the supply voltage on the storage capacitors, a residual voltage appears. V: IH: ... V The transient process in the circuit lasts until the integral current value of the charge current and the integral value of the discharge current on each accumulator capacitor 4 yes over the period will be equal. In this case, the voltage V is set at the integrator4, which depends on OTu. practically does not depend on Л RR; (- R2. The duration of the voltage voltage transient process in this case is estimated by the number N of pulses (periods) of the supply voltage (Fig. 2), determined by the circuit parameters, including the unbalance of the active resistance uR 2 practically does not depend on inductance imbalance. For estimating the AR parameter, the supply voltage from source 7 is fed to the counter 8 pulses, the counting time of which is determined by the presence of the difference of the integral values of discharge and discharge currents for the storage capacitors Voltage metering. Using a pulse counter provides the possibility of converting into a code both the inductance unbalance dL and the active resistance unbalance dR, which expands the possibility of using such converters in the construction of measuring systems and automatic control systems. containing a source of a rectangular voltage, a ring switch, two active-inductive arms, an integrator, a voltage converter in a code and a recorder, o t l and This is due to the fact that, in order to expand its functionality, a pulse counter has been entered into it, the information input of which is connected to the source of rectangular voltage, and the control input - to the integrator output. Sources of information taken into account during the examination 1. Measuring equipment, 1975, I 7, p. 37 (prototype).