SU650204A1 - Self-sustained inverter control method - Google Patents

Description

one

The invention relates to the field of electrical power engineering, which solves the problems of electrical energy conversion, and can be used in the construction of secondary power sources for controlling autonomous inverters.

Known devices for controlling thyristor and transistor devices, made in the form of a closed shift register 1, 2.

The device for controlling the thyristor inverters contains a generator connected to a trigger distributor of control pulses, a logical block of coincidence, the input of which is connected through a puller forming unit to an additional master oscillator.

At the output of the device, the voltage of galvanically generated voltage pulses are formed, which are used to control the thyristors of autonomous inverters. The disadvantage of this solution is a complicated electrical circuit, low reliability and low efficiency.

The device for controlling the inverter thyristors contains a pulse generator, six thyristors, a transformer, and a transistor, connected to a thyristor control circuit, and the collector circuits are connected to the specified transformers. Voltage pulses with a duration of 60 e are formed at the outputs. hail.

The disadvantage of the pressure device is the electrical circuit, low reliability and high installed power of semiconductor elements.

Of the known solutions, the closest in technical terms is a device for controlling an autonomous inverter, 3. It is made in the form of a closed shift register and consists of the pulse shapers connected to the source of a rectangular voltage by the number

phases of an autonomous inverter, each of which contains a matching transformer € one of the nervous and four secondary windings, two of which are connected via diodes to the inverter thyristor control circuits, and switching capacitors, each of the pulse shapers equipped with two parallel-connected thyristors connected in series with the primary winding ordered matching transformer, the third winding of which is connected through a diode to a switching capacitor and parallel to it including to the junction - control electrode

the cathode of one of the thyristors of the same formatoratol pulses, and the fourth through the diode to the secondary switching capacitor and to the control electrode – cathode of one of the thyristors of the subsequent impulse generator parallel to it connected to the junction. As can be seen, in this device the electrical energy is converted twice: first, the voltage of the rectangular form is formed, then with the help of the thyristors of the former, the control pulses of the thyristor inverter are distributed. In addition, the proposed device cannot be used simultaneously to control a widespread on-phase transistor inverter with a pulse duration of output voltage of 120 electrical degrees.

The disadvantage of this solution is a complicated electrical circuit and low efficiency.

The purpose of the present invention is to simplify the electrical circuit and increase the efficiency.

The goal is achieved by the fact that a device for controlling an autonomous inverter, containing a master oscillator, matching transformers with one primary winding and thyristors, is additionally equipped with a frequency divider by three, three bridge power amplifiers on four racks with one ample rack, as well as a pulse shaper , with the frequency divider for three loops connected to the output of the generator generator, the primary windings of the matching transformers are connected to the outputs of bridge power amplifiers, in the circuit And the last two power amplifiers included uploaded thyristors, the control electrodes of which are connected to the outputs of a pulse shaper, connected to the secondary windings of the matching transformer of the first power amplifier, the control circuits of the common rack transistors and the control circuits of the other racks — with the outputs master oscillator.

FIG. 1 is a circuit diagram of a device for controlling an autonomous inverter; in fig. 2 - voltage diagrams.

The device contains a master oscillator: torus 1, divider 2 frequencies into three, three bridge power amplifiers “in transistors 3-10, output transformers 11, 12, 13 amplifiers, driver 14 pulses and thyristors 15, 16.

The outputs of the master oscillator 1 are connected to a divider 2 frequencies into three and to the control circuits of the transistors 5, 6, 7, 8, 9, 10 of three racks. The outputs of the frequency divider are connected to the control circuits of the transistors 3, 4 of the common rack of three power amplifiers, and the outputs of the driver 14 connected to the windings of the transformer 11 of the first power amplifier are connected to the control electrodes of the thyristors 15, 16 included in the power supply circuits of the last two racks.

Consider the operation of a device for controlling an autonomous Inverter. The master oscillator 1 (Roeer's oscillator) generates three-fold rectangular pulses relative to the output inverter (Fig. 2a). The voltage of the secondary windings of the master oscillator transformer enters a 2 frequency divider by three and is controlled by transistors 5, 6, 7, 8, 9, 10 racks of three bridge power amplifiers having one common rack, transistors 3, 4 of which are controlled by

output divider 2 frequency (Fig. 26). The control pulses on transistors 3, 8, 10 and 4, 9, 7, respectively, are received in phase. Moreover, the control pulses of the transistors 3, 4, 5, 7, 6 are supplied so that the pulses at the output of the transformer And are formed by a duration in the half-period of the master oscillator and at the times corresponding to FIG. 2c. The power circuits of the last two racks include thyristors, which are connected to the falling edges of the pulses formed on the transformer I (Fig. 2d). The control pulses on them come from the imaging unit 14, connected to the output windings of the transformer 11, a power amplifier and representing, say, two differentiating circuits. Moreover, the output pulses of the driver (Fig. 2d) of one polarity are supplied to control one thyristor, and the other polarity to control another, the thyristor. When all these conditions are met, two-pole voltage pulses are generated at the output of the transformer 12 and 13, shown respectively in FIG. 2d, 2e. This device can also be used to control a transistor autonomous inverter, at the output of which a voltage is formed without a third and

multiple harmonics to it, i.e. with a voltage pulse duration of 120 e. hail. (Fig. 2d}. The output control voltages are shown in Fig. 2j ... 2k, where the voltage of Fig. 2g and Fig. 2i is 2/3 of the half-period of the working part of the inverter and corresponds to the moment of conduction of the power elements of the inverter, and the voltage of Fig. 2h and Fig. 2 / s is Vs of the half-period of the operating frequency and corresponds to the closed state of the inverter power transistors. This state of the inverter control pulses is maintained at any adjustable frequency of the inverter output voltage,

wherein the frequency is controlled by a master oscillator. The stresses of FIG. 2c and 2k are removed from the windings of the transformer of the first power amplifier, and the voltage of FIG. 2k and FIG. 2m respectively from the output of the second and third transformers. Thus, this device is characterized by a simple electrical circuit and high efficiency due to the fact that the energy conversion in the power circuit is carried out once. In addition, the proposed scheme of the device can be used for the casting of powerful electric units connected to each other by a common technological process. And in this case, the increase in the efficiency of the device will be especially noticeable. The proposed device circuit can also be used to control a single-phase transistor inverter, the output of which forms a voltage without third and multiple harmonics.

Claims (3)

Invention Formula A device for controlling an autonomous inventory, comprising a master oscillator, matching transformers with one primary winding and thyristors, characterized in that, in order to increase Efficiency, it is additionally equipped with a frequency divider by three, three bridge power amplifiers on four racks having one common rack, an impeller, the frequency divider by three connected to the output of the master oscillator, the primary windings of matching transformers are connected to the outputs of bridge power amplifiers, In the litany circuits of the last two power amplifiers, we connected thyristors, the control electrodes of which are connected to the outputs of an immersion generator connected to the secondary windings of the matching transformer of the first power amplifier, the common rack transistors control circuits connected to the outputs of the frequency divider, and the control circuits of the transistors of other racks - with the outputs of the master oscillator. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 218991, cl. H 02gp 7/48, 1964. 2. USSR author's certificate No. 270054, cl. H 02 T 1/08, 1968. 3. USSR author's certificate No. 282514, cl. P 02P 13/16, 1969. 75 re 5.67.8, W.3.f P g