SU902017A1 - Device for checking generators - Google Patents

Description

I

The invention relates to instrumentation engineering and can be used to monitor generators having a bipolar, trapezoidal, sawtooth, triangular output signals.

It is known a device for monitoring amgytitude and duration of pulse fronts, containing the first and second comparators, the gate detector, the peak detector and the sources of the reference signal 1 3

The disadvantage of this device is the limited scope, due to the fact that it provides control of generators with a unipolar output signal of a certain shape, which, it is necessary to change the voltage of the sources of the reference signal, which is not provided in the known device.

Closest to the present invention is a device for the functional control of a square-wave generator, comprising an integrator, a threshold, and a logic element 23.

A disadvantage of the known device is the limited scope due to the impossibility of monitoring generators of bipolar sawtooth, trapezoidal signals, built, for example, on operational amplifiers.

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

The goal is achieved by the fact that the device for controlling generators, containing a sequential included integrator and a threshold

IS element connected to the first input of the logic element, the output of which is connected to the output of the device, the first and second differential amplifiers and rectifier are introduced,

Claims (2)

20 connected by the input to the output of the controlled generator, the output to the first inputs of the first and second differential amplifiers connected by 3 second inputs to the corresponding inputs of the device, the outputs of the first and second differential amplifiers are connected to the integrator input and the second input of the logic element, respectively. FIG. 1 shows the device, functional diagram; in fig. 2 timing diagrams explaining the operation of the device. The device for controlling the generator 1 contains a rectifier 2, the first and second C differential amplifiers, the integrator 5, the threshold element logic element 7. The integrator includes a resistor 8 and a capacitor 9. The threshold element includes a limiting diode 10, a field-effect transistor 11 and a resistor 12. The device works as follows. As a controlled generator 1, a triangular bipolar voltage generator was considered (Fig. 2a) The bipolar output signal of generator 1 is converted by rectifier 2 into a signal of positive polarity of double frequency compared to the output signal of generator 1 (Fig. 26); when the amplitudes of the triangular voltage supplied to the input of amplifier 3 (Fig. 26) are equal to the reference voltage Vfjf, the latter switches, immediately rectangular pulses (Fig. 2c). The reference voltage VQO is selected from the condition Voq Vyfp where the maximum The amplitude of the signal from the output of the rectifier 2. The reference voltage / ctni is chosen from the condition V H, the maximum positive or negative voltage, which is provided by the generator I's passport data. The amplifier k does not work because the maximum amplitude of the triangular voltage (fig.2e). The capacitor 9 of the integrator 5 is charged to the maximum negative value and the voltage determined by the output voltage of the amplifier 3 is slightly discharged during the moments of the positive input pulses, since the duration Flutter input pulses are much longer than the duration of the positive ones (Figure 2d). 74 The threshold element built on the field-effect transistor 7 is in the closed state (Fig. 2e) and outputs a signal of the logical unit to the first input of the logic element 7 that implements the logical function OR NOT. The other input of element 7 receives a logical unit signal from the output of amplifier 4. At the same time, the output of element 7, when the generator 1 is working correctly, has a logical O. In case generator 1 does not work, there is no voltage at its output (times t - t, figa). In this case, the amplifier 3 switches to the state corresponding to the maximum positive voltage (Fig. 2c). The capacitor 9 of the integrator 5 is discharged to the cut-off voltage of the field effect transistor 11, after which the latter opens. The output voltage of the amplifier k remains the same (Fig. 2c), and the output of element 7 appears logical 1. In the case of the output stage of the generator 1, when the maximum voltage of positive or negative polarity appears at its output (Fig .2a since tu). The amplifier 3 switches to the state corresponding to the negative value of the output voltage (Fig. 2B). The capacitor 9 of the integrator 5 is fully charged, in the transistor 11 of the threshold element 6 is locked (fig.2d). Since the amplitude of the input signal is greater than the reference voltage at the input of the amplifier C, it triggers (Fig. 2e), and logical element t is present at the output of element 7, indicating a malfunction of the controlled oscillator 1. The device works in the same way if there are signals of different shapes namely, sawtooth, trapezoidal, sinusoidal and others. The device is able to control the operation of generators in a wide frequency range. The lower limit is determined by the frequency at which the duration of the positive pulse at the output of amplifier 3 becomes sufficient to recharge capacitor 9 of integrator 5 to the cut-off voltage of field-effect transistor 11, resulting in a fault signal at the output of the circuit. Thus, the introduction of amplifiers 3 and i and output 2 allows one to control the generators of bipolar trapezoidal, triangular, sawtooth signals, which expands the field of application of the device. Claims An apparatus for controlling generators, comprising a series-connected integrator and a threshold element connected by an output to the first care of a logic element, the output of the second is connected to the output of the device, characterized in that, in order to expand the area at 176 device changes, the first and a second differential amplifiers and a rectifier connected by an input with an output of a controlled oscillator, an output with the first inputs of the first and second differential amplifiers connected by the second inputs With the corresponding inputs of the device, the outputs of the first and second differential amplifiers are connected to the input of the integrator and the second input of the logic element, respectively. Sources of information taken into account in the examination 1. USSR author's certificate number 658W5, cn, 3 .G 01 R 19/0, 1979. 2. USSR author's certificate fr i 52917. l. 3 H 03 K 5 / 1B, 1975 t {prototype).