SU1018237A1 - Measuring converter - Google Patents

Abstract

MEASURING CONVERTER containing an operational effort; b; The non-inverting input of which is connected to the input through the nerve resistor, and the inverting input to the second resistor and the third resistor and the first diode connected in series with the c & e output, and through the first capacitor, o / tl and -i yusch and and so that, in order to expand the functional possibilities, a transformer is introduced into it, the first primary output of which is connected to the input and (another through sequentially and counter-connected second and third diodes, the common point of which is connected to the second output of the primary winding the transformer is four re. The second capacitor and the fourth resistor are connected in parallel, and the secondary winding of the transformer is connected to the non-inverting input of the operational amplifier and to the common bus. (S O O 00

Description

The invention relates to measuring apparatus and can be used. in the construction of transducers of transformers of DC and AC voltage, as well as pulsed voltages and currents into a unified signal. A measuring converter is known, made on a transformer with one primary and two secondary circuits and on an operational amplifier, the input voltage through the limiting resistor is fed into the primary circuit, and the first output of the first secondary winding, the other output of which is connected to common bus connected non-inerting input of the operational amplifier. The inverting input of the amplifier is connected through a resistor to its output dom and through a busbar capacitor. At the same time, the output is operadionic. amplification is the converter input and through an additional resistor is connected to one output of the second secondary winding, the other output of which is connected to the common bus (11. The disadvantage of this converter is the low-frequency limitation of the measured voltages. due to the phase shift introduced by a transformer, the magnitude of which depends on the frequency of the input voltage. A transmitter is known that contains an operational amplifier, the non-inverting input of which is connected to the output through the first resistor, and the inverting output, with the output through the second resistor and the third resistor and the first diode connected in series, and with the common bus through the first capacitor 2. The disadvantage of this converter is the limited functionality. The delivered target is achieved by the fact that a known measuring transducer containing an operational amplifier, whose non-signed input is connected to the output via the first p A resistor, and an inverter with output through a second resistor and a third resistor and a first diode connected in series, and with a common bus through a first capacitor, a transformer is inserted, the first output of which is connected to the input bus through serially and counter-connected second and third diodes whose common point is connected to the second output of the primary winding of the transformer through a second capacitor and the fourth resistor connected in parallel, and the secondary winding of the transformer is connected to the non-inverting input ode to operational effort. tel and to shared bus. The drawing shows the functional electrical circuit of the proposed converter. The converter contains a transformer.1, to the first output of the secondary winding of which noninverting is connected an input of the amplifier 2. The inverting input of the operational amplifier 2 is connected to the common bus through a capacitor 3. The output of the operating amplifier 2 is connected to its inverting input through a resistor 4 and a chain in series single resistor 5 and diode 6. The output of the operational amplifier 2 is connected to its non-inverting input through a resistor 7. In the input circuit of the converter, a chain of two is connected in opposite directions The connected diodes 8 and 9 between the first input bus 10 and the first output of the primary winding of the transformer 1. The second output of the primary winding is connected to the second input bus 11 and through parallel connected resistor 12 and a capacitor 13 with a common connection point of the diodes 8 and 9 .. The converter operates as follows in a way. In the absence of an input signal on the input buses, the output of the operational amplifier 2f of the generator, together with the feedback resistors 4 5 and 7, the diode 6 and the capacitor 3 self-oscillating multivibrator, generate pulses of a constant frequency and duration. The duty cycle of these pulses is determined by the ratio of feedback and resistance resistors converted from the primary to the secondary. When the measured voltage is applied to the input terminals, a capacitor 13 is charged up to a voltage, the value of which differs from the input voltage by the amount of voltage drop on the forward resistance of the diode 8. A positive signal is generated at the output of amplifier 2 at the secondary winding whose range is determined by the value of the voltage on the capacitor 13 recalculated into the second circuit. The voltage drop across the direct resistance of the diode 8 is compensated by the voltage drop across the diode 9, the switching on is opposite. The voltage on the capacitor-3 reaches the magnitude of the pulse on the secondary winding, after which the output voltage polarity switches and the capacitor 3 recharges through the resistor 4. As the input voltage increases or decreases, the voltage on the capacitor 3 changes according to: , ...

E10182374

With this voltage. Time is ea thus; the interrupt and the commander 3 are performed, the determination of the input signal is

the division period of the output of the set as constant, and pulses and, accordingly, their fast-belt or pulse voltage,

This sequence is determined by the value of the pulse following period. With

for example, on input buses 10 n 11 5 this provides a wide range

the converter, and the conversion of the frequency of the input signals and galvanization is provided in a wide range of input and output

the frequency of the input voltage when the galvanic circuit of the converter is achieved

nicheskoy udelyevni input tce-expansion of functional possibilities;

pi.10te converter.

Claims (1)

. MEASURING TRANSMITTER containing an operational amplifier, the non-inverting input of which is connected to the output through the First resistor, and the inverting one - with the output through the second resistor and the third resistor and the first diode connected in series, and with the common bus through the first capacitor, from l and + a rani and with the fact that, in order to expand the functionality, a transformer is introduced into it, the first output of the primary winding of which is connected to the input bus through the second and third diodes connected in series and counterclockwise, a common point which are connected to the second terminal of the transformer primary winding through a second capacitor and fourth resistor connected in parallel, and the transformer secondary winding is connected to the non-inverting input of the operational amplifier and to the common bus.