Добротворский. Теория электрических цепей. Учебник для техникумов. 1989-Dobrotvorskiy. Theory of electrical circuits. Textbook for technical schools. 1989

LINK
http://www.mediafire.com/file/zqczvej07jiw7pl/dobrotvorsky-CIRCUITS.pdf

Говорков В.А.- Электрические и магнитные поля -Govorkov V.A. -Electric and magnetic fields, 1968

Govorkov V.A. Electric and magnetic fields, ed. 3rd, revised. and additional. 1968 year. 488 pages djvu. 6.6 MB. The book describes the theory of the electromagnetic field in the volume necessary for the practical calculation of the majority of stationary and alternating magnetic fields encountered in the technique of electrical communication, radio engineering, electronic engineering, power engineering, automation devices, etc. Particular attention is drawn to the graphical construction of field paintings, useful for mastering complex physical laws and being the first and necessary step in applying the theory to practice. A significant place in the book is devoted to approximate calculations of electric and magnetic fields by the method of grids. Their mastering frees the calculator from the ungrateful task of finding not always sufficiently justified approximations to the boundary conditions under which the differential equations of mathematical physics admit the so-called "exact" solutions.
LINK
http://www.mediafire.com/file/i009tizd437zfis/Govorkov%20V.A.%20CAMPOS%20ELETRICOS%20Y%20MAGNETICOS.pdf

Development of Photovoltaic Inverter used Grid-Connected Distributed Power Jeong-Do Kim Department of Electrical Engineering Graduate School Pukyong National University

Development of Photovoltaic Inverter used Grid-Connected Distributed Power
 Jeong-Do Kim
 Department of Electrical Engineering Graduate School Pukyong National University 

Abstract
This paper relates to grid-connected single-phase inverter system, the proposed system is a gate pulse signal was added to the active auxiliary resonant circuit in the bridge arm of a conventional grid-connected single-phase half-bridge inverter, main switch is modulated by the SPWM method by configuring so that the, take a feature that can control the multi-phase alternating current can be used in the batch phase inverter. And active by the secondary resonance also work during the snubber circuit a dead time period, soft switching is possible because it actually turns a basic switch in the on state-off and resonant operation after turning the other main switch-which was applied to the whole of the gate signal have the characteristic. Further, when the conventional program is shorter than the width of the gate pulse signal active auxiliary resonant snubber operation time in the operation in the hard switching to occur even if the H, L is the reverse of the gate pulse signal. This power supply is in reversal of the power supply circuit is a short circuit may possibly be damaged since. To prevent this, this paper has set the ARCP operation time and modulation rate settings and processes the pulse of the gate pulse signal reversal was the program not to occur. Further, as the main switch is in the off state to the time when the other switch is turned on, and the dead time is a hard switching method in case of the conventional method to sequence the switching pattern 1.5[μs], While for setting the dead time of the soft switching system with 2.0[ms], For this paper the sequence switching patterns applied to the soft-switching method is 4.0[μs] because the pulse width of the hard-switched at the same modulation rate and time to get a high density to suppress the resonant inductor current as a whole small effect of improving the efficiency have. Running a soft switching operation by the switching pattern sequence scheme applied to the paper, it is possible to suppress the surge voltage and the surge current, the generation of noise of the device is reduced as compared to the effect of the hard switching method.

LINK
http://www.mediafire.com/file/fybzxwr2in0nfhq/Development%20of%20Photovoltaic%20Inverter%20used%20Grid-Connected.pdf

SCHEMATIC CAPTURE WITH CADENCE PSPICE - HERNITER

LINK
http://www.mediafire.com/file/k95lj4c628q53d9/HERNITER-PSPICE.pdf

A High Efficiency LLC Resonant Converter-based Li-ion Battery Charger with Adaptive Turn Ratio Variable Scheme Yeong-Jun Choi*, Hyeong-Gu Han-Dept. of Electrical and Biomedical Engineering, Hanyang University, Korea

A High Efficiency LLC Resonant Converter-based Li-ion Battery Charger with Adaptive Turn Ratio Variable Scheme Yeong-Jun Choi*, Hyeong-Gu Han*, See-Young Choi*, Sang-Il Kim* and Rae-Young Kim†

 Abstract – This paper proposes an LLC resonant converter based battery charger which utilizes an adaptive turn ratio scheme to achieve a wide output voltage range and high efficiency. The high frequency transformer of the LLC converter of the proposed strategy has an adaptively changed turn ratio through the auxiliary control circuit. As a result, an optimized converter design with high magnetizing inductance is possible, while minimizing conduction and turn-off losses and providing a regulated voltage gain to properly charge the lithium ion battery. For a step-by-step explanation, operational principle and optimal design considerations of the proposed converter are illustrated in detail. Finally, the effectiveness of the proposed strategy is verified through various experimental results and efficiency analysis based on prototype 300W Li-ion battery charger and battery pack. Keywords: LLC resonant converter, Battery charger, High efficiency, Adaptive turn ratio, Wide output voltage 1. Introduction Recently, various green transportations such as xEVs, E-bike, and E-scooter using batteries as a main power source, have expeditiously developed and penetrated the commercial marketplace. Generally, lithium-ion batteries are primarily used in such applications due to diverse reasons such as high energy densities, no memory effects and low self-discharge rates [1]. Meanwhile, the importance of the Li-ion battery charging system has also been increased to ensure safe and powerful use of the battery. Most charging systems employ a constant current-constant voltage (CC-CV) charging profile as displayed in Fig. 1 to prevent overcurrent and overcharge of the battery where the dashed line stands for a battery voltage Vbatt and the solid line stands for the battery charging current Ibatt [2]. As can be seen from the figure, the terminal voltage of the battery is widely varied from the cut-off voltage to the maximum charging voltage during the entire charging process; hence, Li-ion battery chargers should cover a wide output voltage range. LLC resonant converter is a promising high-efficiency battery charger candidate possessing several advantages [3-5]. The converter inherently achieves zero voltage switching (ZVS) of the primary side switches and soft commutation capability of semiconductor devices over the whole operational range. Therefore, the turn-on loss is small and the reverse recovery loss of the diode is reduced, so that a high switching frequency operation is possible and the power density of the entire system can be increased
Additionally the magnetic elements of the resonant tank can be integrated into a single transformer core, which isadvantageous in terms of cost.
However, the LLC resonant converter also possesses ahandicap as a battery charger: There is a trade-off in thedesign methodology to achieving high efficiency and meeting wide output voltage variations to cover wide variations in battery terminal voltage. To achieve a wide output voltage range, the LLC resonant converter need tooperate at a frequency lower than the resonant frequency.
However, such operation decreases efficiency due to the presence of a large circulating current. Moreover, a small magnetizing inductance of the resonant tank is usually required; therefore, efficiency became worse due to an excessive turn-off loss and magnetizing current. Hence, the optimal design of an LLC resonant is realized to be adelicate process [6].
To overcome this problem, several studies have been performed [7-15]. One solution is to develop a design method for resonant tanks to meet a given battery voltage and efficiency specification. [7-12]. However, these studiesonly reveal the inherent trade-off relationship limitation that cannot naturally be overcome. In the literature, a strategy of using auxiliary windings was proposed to realize a wide output voltage [13]. However, since this method was proposed for hold-up compensation, so there is no focus on maintaining the ZVS condition, and it is
difficult to apply it to a battery charger. Some other researches discussed solutions for high power applications such as 3.3kW or 6.6kW [14, 15]. The main concept of these studies is to integrate the many advantages of two or more DC-DC converters with topology modification.
However, it is impossible to apply results of theseresearches directly for low power applications below 500W.

LINK WEB
http://www.jeet.or.kr/LTKPSWeb/pub/pubfpfile.aspx?ppseq=1943