SU380244A1 - Converter for converting parameters of complicated electric circuits into time interval - Google Patents

Description

1 The invention relates to the field of radio engineering and can be used to measure the values of the elements of the oscillatory "C-circuits of various electronic equipment. Converters of parametres of complex electrical circuits to the time interval are known, containing a sawtooth generator, sources of positive and negative DC voltages, a DC amplifier, switches, a multi-organ, a time interval sensor, a trigger. However, such converters do not provide the possibility of converting parameters parallel to b pi. The purpose of the invention is to expand the functional capabilities of the converter. . This is achieved by the fact that it has a DC amplifier input, in the negative feedback circuit of which an exemplary resistor is connected, through a parallel-connected measured capacitor and inductance and the first switch is connected directly to the output of a positive DC voltage source and through a second a switch to the output of the sawtooth generator and a common bus; the outputs of the sources of positive and negative DC voltage are connected via a third switch to the same input of the third A switch that has another input connected to the common bus and the output is connected to a DC amplifier through a standard inductance, the output of the latter through a null organ and a pulse distributor is connected to one input of the first trigger controlling the second and third switches second trigger and one input of the third trigger and through the time interval sensor, pa with another input one third of its trigger controlling the first switch and one input of the fourth trigger controlling the fourth switch Lem. FIG. 1 shows a block diagram of a converter; in fig. 2 - time diagrams of signals. The converter contains 1 sawtooth generator, triggers 2-5, switches 6-9, YES DC amplifier 10, reference resistor 11, measured capacitor 12 and inductance 13, exemplary inductance 14, source 15 of constant II voltage, source 16 negative DC voltage, null organ 17, pulse distributor 18, time interval sensor 19. The Converter operates as follows. On a signal from the programmer (PU). The start-up generator 1 of the saw-tooth voltage begins to generate a voltage, kt (K is the steepness of the saw), the first trigger 2 and the fourth trigger 5 are simultaneously transferred, switching the second, third and fourth switches (7, 8 and 9 respectively ). At the same time, the input of the DC amplifier 10 with the reference resistor 11 in the parallel negative feedback circuit is connected via parallel-connected measured capacitor 12 and inductance 13, the first and second switches 6 and 7, respectively, to the output of the sawtooth 1 generator through the exemplary inductance 14, the fourth 9, and the third 8 switches to the output of the source 15 of a positive DC voltage. The voltage at the output of the DC amplifier 10 first increases step-wise and then gradually decreases. When this voltage reaches zero, the zero-body 17 is triggered (time t on time diagrams) and the signal from the first output of the pulse distributor 18 returns to the initial state the first trigger 2 and flips the second trigger 3. The second switch 7 and the third 8 switch, and the input of the amplifier 10 DC through the measured inductance 13 and condensation. The torus 12, the first switch 6 and the second 7 turn out to be connected to the common bus, and through the exemplary inductance 14, the fourth switch 9 and the third 8 to the output of the negative DC voltage source 16. The output voltage of the dc amplifier varies according to the following law:

t.

Uab.

When this voltage reaches zero, the null-organ 17 (time point i time charts) resumes again. The signal from the second output of the pulse distributor 18 starts the time interval sensor 19 and returns to the initial state the second trigger 3, which allocates the time interval tj. , directly proportional to the value of C. At time interval 1, the time interval sensor 19 (time point ij on timing diagrams) is triggered and the signal from its output returns to the initial state the fourth trigger 5 and re-flips the third trigger 4. In this case, the input of the amplifier 10 is constant current is connected through a parallel-connected measured capacitor 12 and inductance 13 and through the first switch 6 to the output of the source 15 of a positive DC voltage, and through the exemplary inductance 14 and the fourth switch reader 9 - to the common bus.

: 802444

Amplifier output voltage 10

DC is charged according to the following law:

Ate

out

where l4jj is the magnitude of the measured inductance 13.

When this voltage reaches zero, the zero-body 17 is triggered again (time L in the time diagrams). The signal from the third output of the pulse distributor 18 returns to its initial state the third trigger 4, the time interval | directly proportional to b.

The time interval proportional to the value of I can be distinguished somewhat differently, for which it is necessary to perform a switching of switches by the signal from the output of the sensor 19 for the time interval directly with the signal from the second output of the distributor 18 pulses, then selecting the time interval A 10 dc amplifier gains a given increment.

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Claims (1)

CONVERTER OF PARAMETERS OF COMPLEX ELECTRIC CIRCUITS IN THE INTERVAL OF TIME, containing a sawtooth voltage generator, positive and negative DC voltage sources, DC amplifier, switches, zero-organ, time interval sensor, trigger, characterized in that, in order to expand the functionality of the converter, it contains the input of a DC amplifier, in the negative feedback circuit of which an exemplary resistor is connected, through a measured capacitor connected in parallel and the inductance and the first switch are connected directly to the output of the positive constant voltage source and through the second switch to the output of the sawtooth voltage generator and the common bus; the outputs of the positive and negative DC voltage sources through the third switch are connected to one input of the fourth switch, the other input of which is connected to a common bus, and the output through the model inductance is connected to a DC amplifier, the output of the latter through a zero-organ and a pulse distributor is connected to one (b the input of the first trigger controlling the second and third switches, with the inputs of the second trigger and one input of the third trigger and through the time interval sensor with another input m third flip-flop controlling the first switch and one input of the fourth flip-flop, the fourth control switch.