To show the merits of the proposed structure, comparison results are provided with other structures. It is shown that the number of on-state switches in the presented structure is less than other similar topologies, which causes the voltage drop and power losses of proposed topology to be reduced.
Power losses analysis on the proposed topology is provided. Also, the magnitude of blocked voltage by switches is low. The suggested structure generates a large number of levels at output voltage waveform with the least number of power electronic components such as insulated gate bipolar transistors, gate driver circuits, dc voltage sources and anti-parallel diodes in comparison with other similar topologies. For generating all levels at output voltage waveform, two methods are investigated for selecting the values of dc sources. This paper proposes an improved two-leg ladder topology for MC. The applications of multilevel converters (MCs) in industry have been increased because of their advantages such as high quality output waveform and lower harmonic distortions. The purpose of the proposed technique is emphasized in terms of high performance, simple configuration and low cost. The maximum percentage error can be reduced from 6.52% of the LVDT output signal without temperature compensation to 0.05% of the proposed technique for the ambient temperature varied from 25 ∘C to 70 ∘C. The performances of the proposed technique are discussed in detail and confirmed by experimental implementation using the commercial devices. The sensitivity of LVDT is unaffected from the proposed compensation technique. The proposed feedback technique requires only the proportional control action to minimize the error caused by the variation of the ambient temperature.
The feedback signal is obtained from two secondary winding signals of LVDT. The subtraction and sum schemes are provided instead of the error detector used in the traditional feedback loop. The realization technique is based on the proposed feedback configuration to minimize the active component used in the circuit.
In this paper, a circuit technique to compensate the temperature effect in the output signal of the linear variable differential transformer (LVDT) is presented.
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