Responses in Trasnformers Built With Planar Coils Inner Ring Coils Excited by Square Waves

Abstract

Abstract-This paper presents an analysis about the results of experiments using planar coils inner ring coils to determine a transformer. The excitation of this system was a square wave voltage, where experiments were realized in two ways: considering planar coil as primary and observing responses on secondary being ring coil (direct system) and the inverse (ring coil as primary and planar coil as secondary-inverted system). In this study, a phenomenon not common in literature on system response is analyzed, showing effects of changes on transfer function in both cases when varying turn numbers of each coil and several variations on responses due to changes on resistances, parasitic capacitances, self and mutual inductances of the coils. The uncommon phenomenon appears as modulated response on specific turn ratio. The obtained results can be used to researches in areas as power electronics and pulse transformers.

Planar Transformers Excited by Square Waves

“…The measurements and system analysis are compared with system described in [19][20][21] which is a transformer built with planar coil inner ring coil, to verify conditions of resonance and energy transfer, including effects of parasitic capacitances on these coils [42], to future applications of these devices.…”

“…In some cases, several analyses about transformers built with planar coils [7][8][9][10][11] are found in literature, which generally is made in integrated circuits [12][13][14][15][16][17][18] and few in large dimensions (in the order of centimeters) with crossing of planar coils and ring coils excited by square waves [19][20][21]. In other studies, analysis of the responses when the transformer is excited by square waves is generally applied to pulse transformers [22][23][24][25][26][27][28], or power electronics [29][30][31].…”

“…In this case, the application is specific, and the analysis is not used to high energy, although some results may be utilized for applications in induced emf for transformers with large dimensions, in a similar way to [19][20][21]. The need to analyze these specific transformers is found in the reduction of electromagnetics devices and their applications, which is much needed today.…”

“…These applications may be seen in several researches on electromagnetics fields [33][34][35][36][37][38], considering analysis of their characteristics as self and mutual inductances [39][40][41] or parasitic capacitances [42]. With these feasible applications, an analysis about transformers built with planar coils is presented in this paper, considering the case of square wave excitation, comparing this analysis with the related problems of [19][20][21].…”

“…So, this paper is presented as follows: the coils data and utilized equipments in realized experiments are shown in Section 2; the analysis about responses of the analyzed configurations, transfer function of the system and discussions about found results, comparing with results of transformers built with planar coils inner ring coils are shown in Section 3; Section 4 analyzes the problem of system resonance and compares these results with the cited transformers of [19,20,21]; the conclusions of this paper are presented in Section 5.…”