SU1525866A1 - Current to voltage converter - Google Patents

Abstract

The invention relates to amplifier technology. The purpose of the invention is to improve the accuracy of work. Pulse driver 1, electromechanical key 3, comparator 6 block 8 OR, electronic key 9, delay line 11, differentiating link 12, standby multivibrator 13 are entered into the device. Key 3 provides high load resistance for the input integrating element 2 in the pauses between voltage samples . The delay lines 11 together with the link 12, the multivibrator 13, the block 8 and the driver 1 ensure the elimination of the influence of the chatter of the contacts of the key 3 on the operation of the device. Comparator 6 switches off amplifier 4 after discharging element 2 to a predetermined level. The accuracy of the device is enhanced by the full discharge of the cond in element 2 after measuring the DC voltage on it. Due to this, the output voltage of element 2 by the time of the next voltage sample is proportional only to the input current of the device. 2 Il.

Description

entrance

The design relates to amplifier technology and can be used in converters of weak direct current to voltage.

The purpose of the invention is to improve the accuracy of work.

Fig. 1 shows the electrical structure of the current-voltage converter in Fig. 1; 2 - voltage plots, which illustrate the principle of operation of the current-voltage converter. The current-voltage converter contains a pulse former 1, an input integrating element 2, an electromechanical key 3, an inverting amplifier 4, an output sampling-storage unit 5, a comparator b, the first electronic key 7, the block OR 8 the second electronic key 9, the generator 10 clock pulses, delay line 11, differentiating link 12 standby multivibrator 13, first and second power sources 14, 15.

The current-voltage converter operates as follows.

The input current of the device is fed to the input integrating element 2, made in the form of a capacitor, in which the input current is converted into a voltage. Further, this voltage through the electromechanical switch 3 is fed to the inverting PVKxqirt amplifier 4, amplified therein and transmitted to the input of the output sample-storage unit 5, in which the output voltage of the inverting amplifier 4 is sampled at appropriate times and stored for a time until the next sample (see Fig. 2, g).

The electromechanical key 3 provides a high load resistance for the input integrating element 2 in the pauses between the voltage samples,

The delay lines 11 together with the differentiating link 12, the waiting multivibrator 13, the OR block and the shaper 1 ensure the elimination of contact bounce of the electromechanical key 3 on the operation of the device (diagrams in FIGS. 2 a, b, c, d).

The comparator 6 switches off the inverting amplifier 4.

0

five

about ,.

five

five

0

five

after the discharge of the integrating element 2 to a predetermined level (FIG. 2g, d), which occurs due to its shunting by the input resistance of the inverting amplifier 4.

Input Current Range

in / i devices 10-10 A,

Inverting amplifier 4 can be performed on the basis of the operational amplifier type K544UD2,

Tochnr, st. operation of the device is enhanced due to the almost complete discharge of the capacitor in the integrating element 2 after measuring the DC voltage on it. Due to this, the output voltage of the integrating element 2 by the time of the next voltage sample is proportional only to the input current of the device.

Claims (1)

Invention Formula Current-voltage converter containing an input integrating element, a series-connected inverting amplifier and an output sampling-storage unit, an electronic key and a clock pulse generator, characterized in that, in order to improve accuracy, series-connected delay lines are introduced, a differentiating link waiting for a multivibrator , the OR block and the pulse shaper, as well as a comparator, a second electronic key and an electromechanical key, inserted between the output of the input integrating element and the input of the inverting amplifier, and the kro control input is connected to the output of the clock pulse generator and the line input, the second input of the OR block is connected to the output of the comparator, the input of which is connected to the output of the inverting amplifier, the first electronic switch is connected between the first power supply and the first power supply bus of the inverting amplifier the second electronic key is between the second power source and the second power bus of the inverting amplifier, and the control inputs of the first and second electronic keys are connected to the output of the forms pulse grader,.