TR2022021838A1 - Mixed core structure for split core inverter output transformers. - Google Patents

Abstract

The invention relates to a mixed core that prevents extra temperature increases and vibrations that occur in transformers. The invention particularly relates to a mixed core structure formed by adding core material of different properties to one of the cores produced from the same core material, in which air gaps are removed.

Description

DESCRIPTION MIXED CORE FOR SPLIT-CORE INVERTER OUTPUT TRANSFORMERS Technical field to which the invention relates: The invention prevents extra temperature increases and vibrations occurring in transformers. It is related to a mixed core.

The invention is particularly aimed at products produced from the same core material, where air gaps are removed. A composite formed by adding core material with different properties to one of the cores. It is related to the core structure.

Known state of the technique: Converting direct current (DC) electrical energy into alternating current (AC) electrical energy Static inverter/converter circuits are used for Nowadays, direct current is an alternative It is used in different purpose applications, photovoltaic systems and wind turbines where it is converted into current. Transferring the DC energy produced in turbines to the AC grid and providing uninterrupted power These converters are widely used in sources (UPS). This In applications, the inverter output voltage is compatible with the distribution network voltage level and It is desired to be within a controllable range. On the other hand, renewable energy Alternating current (AC) output in low amplitude direct voltage applications such as welding It can be made compatible by increasing the voltage with a transformer. Two of the transformers In addition to providing isolation between the source, switched power with a good design Filtering of signals can also be done with the help of these transformers. Because It is especially used in uninterruptible power supplies (UPS) and is used to improve device output performance and The design of transformers, which have a great impact on efficiency, is very important. This Transformers are used for voltage matching, isolation and inverter output. Tasks such as preventing the DC component from being transferred to critical loads undertakes.

Inverter transformers are made of standard transformers operating at mains frequency. Considering the properties such as saturation and input impedance, structural properties It appears that there are significant differences in terms of Inverter transformers structural input from standard transformers operating at mains frequency in terms of their characteristics Pre-empt saturation effect that may occur due to impedance and switching errors. They differ in aspects such as taking precautions. Besides this, the inverter Transformers that can be found in the circuit, in addition to providing insulation, It also undertakes the task of filtering the signals. Inverter transformers, standard transformers in terms of their properties such as saturation and input impedance. differs [1]. Pulse width modulation (PWM) in power electronic circuits In case the positive and negative alternances are not equal in the switching made with The core parts of the transformer at the inverter output become saturated and cause extra It may cause temperature increases and vibrations. If this effect is too high, It causes transformers to overheat even when they are unloaded. PWM signals It is always easy to eliminate the saturation effect by balancing the alternances with It is a risky situation because it cannot be done. Negativities in the control system, switches delay and non-linear behavior increase this effect. But the inverter Saturation effect with design changes that can be made in the core structure of the transformer can be prevented more effectively [2].

In classical designs, the primary winding is at the bottom and the secondary winding is at the top. Reactance in transformers is approximately 3-6%. Low reactance (

Claims (1)

STEMS are transformers that provide electrical energy transfer between two or more circuits by electromagnetic induction, and their feature is; It contains the A core (1), which has a separate structure with the 0 B core (2), and the B core (2), to which the core material (3), which has a lower magnetic flux value and permeability value than the 0 A core (1), is added intermittently. It is a transformer as in Claim 1 and its feature is; It contains an A core (1) made of silicon alloy steel with a magnetic flux value of 1.7 tesla. It is a transformer as in Claim 1 and its feature is; It contains core material (3) with a magnetic flux value less than 1.7 tesla. It is a transformer as in Claim 1 and its feature is; It contains a B core (2) to which core materials (3) are added, which can be changed to have a lower magnetic flux value and material than the A core (1) and B core (2) for different applications, according to parameters such as number of phases, current, voltage and frequency. It is a transformer as in Claim 1 and its feature is; It contains a B core (2), the number and size of which can be determined according to the core saturation characteristic and the flux value to be formed, creating a hybrid core by adding a core material (3) with a lower flux and different permeability value between the yoke and leg parts.