SU393809A1 - LOGICAL ELEMENT INVERTER REPEATER - Google Patents

Description

Application is related to industrial electronics.

A logic element of an inverter repeater is supplied with power from a three-phase transformer with AMV groups of secondary O-windings, two coverings of one group of which are connected to a thyristor through diodes and resistors, the junction electrode-cathode of which is bridged by a diode in the i-conducting direction and through its own resistor dealt with and; with a negative offset offset.

The purpose of the invention is to improve noise immunity.

In the proposed logic element, as a source of negative bias and polaroids, they are connected via diodes and -resistor with a control electrode-cathode junction two of the second group of secondary transformer windings, in parallel with which an additional secondary transformer winding is connected via a diode.

On phi (d. 1 1, the electrical circuit of the logic element is shown; Fig. 2 shows the time diagrams of its operation.

The logic element is read from a three-phase network through a three-phase transformer / with two groups of secondary windings and one additional winding. Diodes 2 and 3 form a source of high -multiply two-pulse voltage (Fig. 2a), a positive

during the 5/6 period of one phase of the litany source and equal to zero during 1/6 of the period.

When the circuit operates in the inverter mode, the load of the 4 repeater is shorted, and when it operates in the following mode: Vtorntel, the load of the inverter 5. In the absence of a control signal at the input 6 of the logic element, the thyristor 7 is not turned on, and the load on the repeater load is zero, and the supply voltage is present on the inverter load. When 1 is fed into the 1K11 signal, the thyristor 7 is turned on, a voltage appears on the repeater load and the voltage drops in the load of the investor. The thyristor is turned off when the power supply becomes zero. If the control signal, including the thyristor, remains, in the next power period, the process is repeated.

A source of rectified two-pulse voltage synchronous with the power supply of a logic element (diodes 8 and 9) are used as a source of negative bias, which is electrically separated from the three-letter alternating voltage network. A transformer secondary winding is connected to the output of the bias source through the diode 10 in the conducting direction, the voltage in which is shifted relative to

the advanced phase of rectified voltage is 180 °.

The shape of the bias voltage is shown in FIG. 26. When a control signal is applied to input 6 of the logic element (Fig. 2c), the current through the control electrode-cathode junction (Fig. 2d) is flowing when the bias voltage is close to zero, which is only a small part period of tension litany. This significantly reduces the thermal load of the junction.

The thyristor is switched on by the action of the control signal, when the bias voltage is equal to zero.

The subject was invented by an inverter repeater logic element powered by a three-phase transformer with two groups of secondary windings, two windings of one group of which are connected to a thyristor through diodes and resistors, the junction of the control electrode-cathode is bridged by a diode in a non-conductive nampaiB and through a resistor 1a with a source of negative bias, characterized in that, in order to increase noise immunity, as a source of negative bias and utilized associated with diodes and a junction resistor etching electrode-cathode two windings of the second group of secondary windings of Transformator, in parallel with which an additional secondary winding of the transformer is connected via a diode.

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