SU794608A1 - Relay device - Google Patents

Description

(54) RELAY DEVICE

The invention relates to the field of automation and can be used in frequency converters, stabilizers, in automatic motor control systems with DC-pulsed current, and converters.

A relay device is known that contains an operational amplifier, a reference voltage source and a diode Jl.

Of the known relay devices, the closest to the technical essence of the invention is a relay device containing an operational amplifier, the inverting input of which is connected via the first, second and third limiting elements respectively to the first and second input devices of the device and the output of the local amplifier The noninventing input of which is connected to the output of the fourth bounding element | 2.

However, the scope of such devices is limited.

The purpose of the invention is to expand the field of application of the device.

This goal is achieved by introducing a correction element in the proposed relay device, the input of which is connected to the output of the operational amplifier, and the output to the input of the fourth limiting element.

FIG. 1 shows a circuit diagram of a relay device; in fig. 2 - its amplitude characteristic, where: operational amplifier /; the first, second, third, and fourth limiting elements (resistors) 2, 3, 4, and 5; a correction element 6 consisting of the first and second diodes 7 and 5 and the first and second sources of the reference voltage 9 and 10.

The device works as follows.

If the first and second diodes 7 and 8 of the correction element 6 are considered ideal, then in the absence of an input voltage at the first input 11 of the device (t / a, 0), the voltage at the output 12 of the device is also zero, which is achieved by the corresponding polarity and voltage value displacement voltage (/ cm (zero setting) arriving at the second input 13 of the device. IRI) is the input voltage (Un-i- 0) the voltage at the output of the operational amplifier / that is the output voltage, proportional to input voltage

t / as, with Uf: ,, - (Von,

The proportionality coefficient in this area of the amplitude characteristic is determined by the ratio of the resistance value of the third resistor (negative feedback resistor) 4 to the small value of the resistance of resistor 2 in the input voltage circuit. At Lout, a diode 7 or 5 opens (3 polarity dependent) and the delayed positive feedback is turned on. IF you set the resistance value of the positive feedback circuit resistor 5 so that the positive feedback ratio, determined by the ratio m of the resistance value of resistor 2 to the co-resistance value of resistor 5, is greater than the same negative feedback circuit coefficient, then the output dependence voltages fv ,,, ;; from the input voltage U „acquires a relay character. The output voltage Uaa increases abruptly before the limiting voltage. The effect of imperfect characteristics of the diodes 7 and 8 is reduced to the appearance of curved sections in the transition from the linear portion of the amplitude characteristic to the relay in the forward branch and in the transition from saturation to the relay in the reverse branch (cf. Fig. 2). This allows a wider range of application of the device. Forms j l a and 3 o b e and Relay device containing an operational amplifier, the inverting input of which is connected respectively through the first, second and third limiting elements with the first and second inputs of the device and the output of the operational amplifier, non-ventilation input of which is connected to the output of the fourth limiting element, characterized in that, in order to expand the area and application of the device, it contains a correction element, the input of which is connected to the output of the operational amplifier, and the output - to the input fourth limiting element. Sources of information accepted for consideration and examination: 1.G. Korn, T. Korn. Electronic analog and analog-digital computers. M., “Theory and basic functional blocks. Translation from English. M., ". Peace, 1967, p. 447, FIG. 8.25. 2. Electronic equipment in automatics. Sat articles ed. Y. PL Konev. M., “Soviet Radio, 1973, Issue 4, p. 91, fig. 1 (prototype).

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Claims (1)

Fair m u la t and me A relay device containing an operational amplifier, the inverting input of which is connected respectively through the first, second and third limiting elements to the first and second inputs of the device and the output of the operational amplifier, the non-inverting input of which is connected to the output of the fourth limiting element, characterized in that, in order to expand the scope device, it contains a correction element, the input of which is connected to the output 15 of the operational amplifier, and the output to the input of the fourth limiting item.