SU641613A1 - Inverter - Google Patents

Description

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The invention relates to a converter technique and can be used to convert a high-level constant voltage to a constant voltage of any other level.

Inverters are known in which, in order to increase the voltage to be converted, a series connection of transistors 1 is used (21i of the known devices closest to the invention according to the technical essence is an inverter {2) that contains transistors connected in a two-stroke scheme with an output transformer, the core of which are located additional windings.

The disadvantage of such inverters is low reliability and reduced efficiency due to power losses on the equalization chains.

Especially characteristic of these disadvantages for half-bridge type inverters. Therefore, when operating at higher voltages, serial connection of half bridge inverters is often used. However, the capacitors included in the inverters are connected in series,

as a result, the total capacitance decreases and the input ripple increases. To reduce the ripple value, it is necessary to increase the capacitance of the capacitors of each of the series-connected inverters. Since the dimensions of the electrolytic capacitors are proportional to the product of the capacitance by the operating voltage, the half-bridge inverter assembled on two capacitors with series connection of transistors in the arms will always be smaller in size than a device consisting of series-connected half-bridge inverters under other slave conditions.

The aim of the invention is to increase the reliability of the inverter by aligning the reverse voltage on transistors, as well as improving the efficiency of the inverter. This goal is achieved by the fact that an inverter containing transistors connected in a push-pull circuit with an output transformer, on the core of which additional windings are located, and a chain of successively connected parallel to the power transition of each transistor.