SU1390751A1 - Two-cycle thyristor inverter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in secondary power supply and electric drive systems. The purpose of the invention is to increase the efficiency and reliability of the inverter by automatically balancing the remagnetization of the core of the output transformer. The inverter contains a magnetic transistor oscillator (AG) with a saturable transformer and a power amplifier. In the presence of asymmetry of the shoulders of the power amplifier, the AG enters through the diodes of the first pair of different amplitudes, which excludes the possibility of an increase in the magnetizing current of the transformer. 1 1. i (Л С

Description

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The invention relates to electrical engineering and can be used in secondary power supply systems for converting a constant voltage to an alternating voltage.

The purpose of the invention is to increase the efficiency and reliability of the inverter by automatically balancing the remagging of the core of the output transformer.

The drawing shows a schematic diagram of the proposed inverter.

 The inverter contains a magneto-transistor oscillator 1 with a saturable output transformer 2 with two primary windings 3 and 4. The secondary windings of transformer 2 are connected to the control inputs of the power transistors 5 and 6 of the amplifier

7power. The average output of the primary winding of the output transformer

8 power amplifier 7 is connected to one of the power terminals of the inverter, and each extreme terminal of this power winding is connected to windings 3 and 4 through diodes 9 and 10 of the first pair. In this case, each winding 3 and 4 through diodes 11 and

12 of the second pair is connected to the supply terminal of the inverter. The control input of the oscillator 1 is connected to the output of the pulse starting circuit.

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The inverter works as follows.

When the power supply E is connected to the inverter input, the start-up circuit 13 generates a starting pulse, which starts the magneto-transistor oscillator 1. At the same time, the supply voltage to the saturating transformer 2 of the oscillator 1 is supplied through diodes 11 and 12 of the second pair. After the appearance of rectangular pulses at the output of transformer 2, alternating opening and closing of transistors 5 and 6 of power amplifier 7 occurs. Since the voltage at the input of transformer 2 rises to a level corresponding to double voltage E | during operation, the second pair of diodes 11 and 12 closes and excluded from work. In this case, the auto-oscillator 1 receives an increased supply voltage through the first pair of diodes 9 and 10.

In the presence of asymmetry of the shoulders of the amplifier 7 power, for example the difference in the number of turns of the half winding

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transformer 8, the input of the autogenerator 1 will be supplied through the first pair of diodes 9 and 10 of different amplitude voltages. In this case, a higher voltage value on the windings 3 and 4 of the oscillator 1 corresponds to a smaller pulse duration at the input of the adjacent arm of the power amplifier 7. Thus, an automatic balancing of the magnetization reversal (volt-second integrals) of the core of the output transformer is provided.

The use of the invention allows to eliminate the power amplifier transistors from building up when asymmetry appears in the area of control pulses at the input of the power transformer, to reduce the power dissipation at the power amplifier transistors, t; e, increases the efficiency and reliability of the inverter.

Claims (1)

Invention Formula A push-pull transistor inverter containing a magneto-transistor oscillator with a common transformer having two primary windings., The first opposite-pole outputs of which are connected to the autogenerator transistorsJ and the secondary windings connected to the inputs of the power transistors of the two-stroke power amplifier through which the ends of the primary winding of the transformer lead. the first input terminal of the inverter, and the tap from the midpoint of the primary winding of the output transformer is connected to the second input Inverter output, pulse starting circuit and the first pair of diodes, characterized in that, in order to increase the QDC and reliability by automatically balancing the remagnetization of the output transformer core, the second pair of diodes are inserted, and the second polarity of the primary windings of the next transformer through the corresponding diodes the first pair is connected to the connection point of the corresponding power transistor with the primary winding of the output transformer and through the corresponding diodes of the second pair - from the second m input terminal of the inverter.