SU826835A1 - Phase-dependent converter - Google Patents

Description

connected to the center of the star, a transistor optocoupler was used as a nonlinear element with galvanically developed switching pins and a zero signal; , with the first two thyristor optocouplers connected by thyristor anodes to the center of the star through the pen, and the other two are connected to the cathode of the thyristors with the center of the star through the danes, and a consonant connection of parallel-connected equalizing dpods of one side of the thyristor optocouplers is connected to a source of switching voltage counter to the coherent connection of the electrodes of the control diodes of the second pair of thyristor optocouplers.

A schematic diagram of the converter is shown in FIG. one.

The converter is built according to the four-beam star scheme.

Each star's beam contains a tuner optocoupler, a diode and a resistivity.

The converter contains thyristor ontrons 1, 2, 3, 4, n-semiconductor diodes 5, 6, 7, 8, resistances 9, 10, 11, 12, load resistance 13 and source of voltage 14.

In the two rays of the star, the anodes of the thyristors of the thyristor optocouplers 2, 4 are connected to the center of the star. The other two beams are connected to the center of the star by the negative electrodes of diodes 5, 7. In addition, every two beams of the star containing the connected thyristors of the thyristor optocouplers 3 and 4 are connected parallel to each other and in series with the source 14 of the useful signal (±), the midpoint of which connected to one of the terminals of the load resistor of the converter, and the other pin of it is connected to the center of the star.

In each beam of the star, the positive electrode of the diode is connected to the cathode of the thyristor of the thyristor optocoupler. The control electrode of the thyristor of the thyristor optocoupler is connected through a resistance to the negative electrode of the diode.

A consonant connection of parallel-connected control diodes of one pair of thyristor optocouplers 1, 2 is connected to the source of its switching voltage counter to the coherent connection of electrodes of control diodes of the second pair of thyristor optocouplers 3, 4.

The signal plots acting on the converter elements are shown in FIG. 2

At the considered moment of time, the commuting is acting on the outputs A of the controlling diodes of the thyristor optocouplers

This form is shown in the first line of the diagrams of FIG. 2. Commuting N1, its submission is This is the result of a module with a voltage that is equal to the frequency of the useful signal, by means of a low frequency at which one wishes to receive a useful signal at the output of the converter.

In the first semi-cornea of the specified voltage, the control diodes of the first 1 and second 2 tripristor optocouplers will emit photons (line 2 of diagrams of Fig. 2), under the action of which it is possible to open their thyristors. In this case, the thyristor of the indicated ontron in the presence of a negative signal at the center of the star (line 3 enur phpg. 2) will pass the current in the forward direction, since its control electrode will have a positive voltage that occurs when the current passes through the direction through the diode 5. The transistor optocoupler 2 circuit is open reversely biased diode junction 6.

Such connection of the thyristor of the thyristor ontron, diode and resistance allows to accelerate the opening of the thyristor.

The control diodes of the thyristor optocouplers 3, 4 will not pass the current, since the positive half-commutating voltage in the considered time of time acts on their negative electrodes.

Thus, the signal current is able to pass only from the middle output of the signal source, on which a positive zero-wave panrh does work relative to the left output of source 14 through a resistor, according to the included zero-conductor diode 5 and open thyristor of the thyristor optocoupler 1 to the left output of the signal source 14 Fig. 2).

The thyristor thyristor optocouplers 3 and 4 circuits are open circuits: circuit 3 — due to the oppositely connected diode 7 and circuit 4 — the oppositely connected thyristor of the thyristor optocoupler 4.

In the next half-period of the switching voltage, a positive voltage level is observed at the right output terminal of the source of 14, 14. The coupling on the resistor 13 will be caused by the current passing through the circuit of the tirpstorny optocoupler 3.

During this low-voltage low-voltage period, the voltage across the load resistor 13 will be caused by currents passing through the thyristors of the thyristor optropes 1, 3. The current will not flow through the thyristors of the thyristor ontrons 2, 4 in this half-period of the low-frequency voltage.

In the next half-period of the low-frequency voltage, the resist will be applied to the resistor;

passing through thyristors thyristor optocouplers 2, 4.

Voltages on the load caused by currents through the thyristors of the thyristor optocouplers 1,3 and 2,4 are shown in line 5 of the diagrams of FIG. 2, and the voltage on the load, caused by the currents of all thyristors of the thyristor optocouplers, in line 6 of the same diagrams.

When changing the phase of the useful signal by 180 ° (line 7 plots), the voltage across the load will be as shown in line 8 plots.

Thus, when changing the phase of the useful signal by 180 °, the phase of the output voltage is also 180 °.

As a result of applying the proposed converter, it was possible to increase the sensitivity with small input signals and to expand the dynamic range of the conversion characteristic, as well as to build a phase-dependent converter chip on alternating current without using discrete elements.

Claims (1)

1. USSR author's certificate number 76125, cl. G 01R 19/00, 1973.