SU789825A1 - D.c. voltage tolerance monitoring apparatus - Google Patents

Description

t

The invention relates to analog computing technology and can be used in measuring and controlling automation devices for tolerance control and comparing 5 two signals with logical processing of control results.

A device is known that contains an amplitude comparator, a reference voltage source, and an output driver.

However, this device has a low stability and accuracy of control.

The closest technical solution to this invention is the 15th tolerance control device, which contains an amplitude limiter, a filter, a voltage follower, an amplitude comparator, a reference voltage source, and an output signal generator 20.

The disadvantage of this device is the insufficient stability of the threshold level due to the drift of the zero level detector. This reduces the stability and accuracy of the device and limits its functionality.

The purpose of the invention is to improve the accuracy and stability of work. thirty

The goal is achieved by the fact that a constant voltage control device containing an amplitude limiter whose input is connected to the input busbar, for example, through a filter and directly to the input of a voltage follower, the output of which is connected to the mountain input of the amplitude comparator, to the second input the source of the reference voltage, and the output driver, is connected to a null organ, one input of which is connected to the output of the amplitude comparator, the second input to the common bus, and the output dklyuchen to the input of the output signal shaper.

The drawing shows a block diagram of the device.

The tolerance control device contains an input bus 1, a filter 2, an amplitude limiter 3, a voltage follower 4, an amplitude comparator 5 and a null organ .6, forming a level 7 detector, a reference source 8, an output driver 9, output buses 1C , eleven.

Claims (2)

The device works as follows. When supplying voltage (if there is no input signal and a source of reference voltage) at the output of the amplitude comparator 5, due to fluctuation and due to positive feedback, a positive differential is set | p1i, which is fed to the inverting input zero - organ 6, at the output of which a negative voltage drop is established. On the output bus 11 of the output driver 9, which is a key circuit with one steady state, triggered only by positive voltage drops, a positive voltage drop is established. corresponding to the level of the logical unit, and on its output bus 10 - a positive (or zero) voltage drop corresponding to the level of logical zero. At the same time, the amplitude comparator and the nullorgan are in the saturation mode, at which the stable state of the device circuit is ensured. When a positive voltage is applied to the non-inverting input of the amplitude comparator 5 from the source 8 of the reference voltage, the state of the device n is changed. When a positive voltage is applied to the input bus 1 at the output of the voltage follower 4, the same positive voltage appears (since the transfer coefficient of the voltage repeater 4 is approximately equal to one), which goes to the inverting input of the amplitude comparatory 5. V. The moment when the voltage value at the inverting input of amplitude comparator 5 exceeds the voltage value at its non-inverted input at some value, or the voltage at both amplitude inputs of KOMnapaTopia 5 are equal, the amplitude parameter is equal to 5 and flushes its output abruptly exhibit a differential voltage is negative Nogo. At the moment of transition in the voltage of the amplitude comparator 5 from a positive level to a negative (more precisely, at zero voltage at the output of the amplitude comparator 5), a zero-organ b is triggered, at the output of which a positive voltage drop occurs, ensuring the operation of the thermal driver circuit of the 9 output signals, and a positive voltage drop corresponding to the level of the logical unit is established on its output bus 10, and a positive (or zero) differential n direct voltage corresponding to a logic-zero level. When the voltage of the input signal decreases (at the moment when the voltage on the inverting input of amplitude comparator 5 decreases by a certain amount relative to the voltage on its non-inverting input), the amplitude comparator 5 switches, and then the entire device to its initial state. The hysteresis response characteristic of the detector level 7, due to the operating mode of the amplitude comparator 5 and the zero-organ 6, increases the stability and accuracy of the device. .. When the input signal is increased, its maximum value at the input of the repeater 4 voltage will be limited to the level allowed for the voltage follower. Impulse and industrial noise at the input of the device is suppressed by the noise-reducing filter 2. The presence of two independent output buses (direct 10 and inverse 11), with standard logic levels and a large input impedance, expand the scope of use of the tolerance control device in automatic control and regulation systems logical processing of the output signal. Claims An adrenal voltage tolerance control device containing an amplitude limiter / input of which is connected to an input bus, for example, through a filter and directly to an input of a voltage follower / output of which is connected to the first input of an amplitude comparator, to the second input of which a reference voltage source is connected. output shaper, characterized in that, in order to increase stability and accuracy of operation, a null organ is inserted into it / one input of which is connected to the output of the ampl an intelligent comparator, the second input is with a common bus, and the output is connected to the input of the output shaper. Sources of information taken into account in the examination I. USSR author's certificate 618691, cl.-G -01 R 19/16, 08.D6.76. , 2. For the application of FRG 2364185, cl. G 01 R 19/16, 20.05.76. X ± T