Coupled Inductor

Abstract—DC–DC converters with voltage boost capability are widely used in a large number of power conversion applications, from fraction-of-volt to tens of thousands of volts at power levels from milliwatts (mW) to megawatts (MW). The literature has reported on various voltage boosting techniques in which fundamental energy storing elements (inductors and capacitors) and/or transformers in conjunction with switch(es) and diode(s) are utilized in the circuit. These techniques include switched capacitor (charge pump), voltage multiplier, switched inductor/voltage lift, magnetic coupling and multi-stage/-level, and each has its own merits and demerits depending on application, in terms of cost, complexity, power density, reliability, and efficiency. To meet the growing demand for such applications, new power converter topologies that use the above voltage boosting techniques, as well as some active and passive components, are continuously being proposed. The permutations and combinations of the various voltage boosting techniques with additional components in a circuit allow for numerous new topologies and configurations, which are often confusing and difficult to follow. Therefore, to present a clear picture on the general law and framework of the development of next generation step-up dc–dc converters, this paper aims to comprehensively review and classify various step-up dc–dc converters based on their characteristics and voltage boosting techniques. In addition, the advantages and disadvantages of these voltage boosting techniques and associated converters are discussed in detail. Finally, broad applications of dc–dc converters are presented and summarized with comparative study of different voltage boosting techniques. Index Terms—Switched mode step-up dc–dc converter, PWM boost converter, voltage multiplier, voltage lift, switched capacitor, switched inductor, coupled inductors, transformer, multistage converter, multilevel converter.

This paper introduces a non-isolated high step-up dc-dc converter with dual coupled inductors suitable for distributed generation applications. By implementing an input parallel connection, the proposed dc-dc structure inherits shared input current with low ripple, which also requires small capacitive filter at its input. Moreover, this topology can reach high voltage gain by using dual coupled inductors in series connection at the output stage. The proposed converter uses active clamp circuits with a shared clamp capacitor for the main switches. In addition to the active clamp circuit, the leakage energy is recycled to the output by using an integrated regenerative snubber. Indeed, these circuits allow soft-switching conditions, i.e. Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS) for active and passive switching devices, respectively. The mentioned features along with a common ground connection of the input and output make the proposed topology a proper candidate for transformer-less grid connected photovoltaic systems. The operating performance, analysis and mathematical derivations of the proposed dc-dc converter have been demonstrated in the paper. Moreover, the main features of the proposed converter have been verified through experimental results of a 1 kW laboratory prototype.

High-Efficiency High Step-Up DC-DC Converter with Dual Coupled Inductors for Grid-Connected Photovoltaic Systems. Available from: https://www.researchgate.net/publication/319312536_High-Efficiency_High_Step-Up_DC-DC_Converter_with_Dual_Coupled_Inductors_for_Grid-Connected_Photovoltaic_Systems [accessed Oct 3, 2017].

Step-up dc-dc converters are used to boost the voltage level of the input to a higher output level. Despite of its features such as simplicity of implementation, the fundamental boost dc-dc converter has shortcomings such as low boost ability and low power density. With these limitations, researches on new voltage boosting techniques are inevitable for various power converter applications. This can be achieved either by additional magnetic or by electric field storage elements with switching elements (switch and/or diode) in different configurations. Such combination of primary voltage boosting techniques and topologies are large, which at times may be confusing and difficult to follow/adapt for different applications. Considering these aspects and in order to make a clear sketch of the general law and framework of various voltage boosting techniques, this paper comprehensively reviews different voltage boosting techniques and categorizes them according to their circuit performance. Keywords— High step-up dc-dc converter; high voltage gain; interleaved; magnetically coupled inductor; multi-level; multi-stage; switched capacitor; switched inductor; voltage multiplier.

Interleaved DC-DC converter with coupled inductor is used in standalone Photovoltaic, battery charger/discharger applications. The main issue of the Interleaved DC-DC converter is that, it does not provide constant output voltage for a change in input voltage. Therefore, the converter efficiency is reduced. Hence to overcome this drawback, proper controller has to be used. In this paper, different control techniques such as PI, PID and Fuzzy logic controller are used. The simulation was carried out using MATLAB/Simulink and the results were compared. Fuzzy logic controller provides better regulated output voltage with less settling time.

In this paper, a three-phase hybrid rectifier is
proposed, employing a boost converter without the addition of
isolation transformer and output voltage control. This topology is
usually considered to be not viable due to the current interactions.
In order to mitigate those interactions, the boost inductor is
replaced by a magnetically coupled inductor. The coupled
inductor forces the balance between the two interconnected
windings, placed at the positive and negative poles, and thus
eliminating the current interactions. The results show that the
proposed three-phase rectifier does not undergo a current
interaction and functions as a hybrid rectifier. Furthermore, it
was noted that the proposed rectifier at 20 kW presents an
elevated power factor and a low total harmonic distortion.

This paper presents a practical and structured approach to the design and optimization of RF spiral inductors. The accuracy of proposed modified accurate distributed and scalable compact lumped models are quantitatively compared with experimental results. Based on the new scalable compact lumped model, a quality factor optimization engine is verified. The inductors under study include single/double layer inductors, metallization shunted as well as octagonal shaped inductors. Experimental results suggest that the new modified accurate distributed model is more accurate than existing models for predicting spiral inductor performance to even beyond resonance frequencies. In addition, using a self developed optimization engine, the new scalable compact model is sufficiently accurate in determining the optimum inductor geometry. Consequently, a web-based program (SISOP) is developed to provide RF designers total solution to spiral inductor design, optimization and integration of spiral inductor model into their lump circuit simulators.

Abstract—In this paper a new technology is proposed with a replacement of conventional voltage source/current
source inverter with Improved Trans-Z-source inverter in automobile applications. The improved Trans-Z-source
inverter has a high boost inversion capability and continues input current. Also this new inverter can suppress the
resonant current at the startup; this resonant current in the startup may lead the device to permanent damage. In
improved Trans-Z-source inverter a couple inductor is needed, instead of this coupled inductor a transformer is used.
By using a transformer with sufficient turns ratio the size can be reduced. The turn’s ratio of the transformer decides
the input voltage of the inverter. In this paper operating principle, comparison with conventional inverters, working
with automobiles simulation results, THD analysis, Hardware implementation using ATMEGA 328 P are included.

Generally high voltage boost gain cannot be achieved in conventional step-up converters since the parasitic parameters will set an upper limit on the duty ratio at which the converter can efficiently operate. In recent years many high step-up DC-DC converters have been proposed. Among the developed converters, the high step-up single switch converters exhibit large input current ripple which make them unsuitable to operate at heavy load due to high conduction losses. So a new super boost converter is designed. This converter consists of switched capacitors and two coupled inductors. This combination of coupled inductors and switched capacitors can provide high voltage boost gain while operating with small duty cycle. By using one individual DC voltage source in an interleaved manner the converter can be powered. The configuration of the proposed converter advantages such as low power losses, longer lifetime of input sources due to non-pulsating input current, low voltage stress across the main switches and slow output fluctuation. The concept is to constant voltage By implementing this converter a 22.5 times gain can be reached 0.5 duty ratio and turns ratio equal to 2.Simulation results will be presented to demonstrate the authenticity of the proposed converter.

The work is concerning a multi-port dc-dc converter with improved time response and steady state output. Here the converter carries bare amount of switches for managing the power with mono inductance. The inductance and along with that the switched capacitance are pre owned to bring large voltage gain. This paper put forwarded an appropriate controller for the closed loop monitored high-gain converter with three ports. Higher is that the conversion rate. This converter is also a good interface between DC-source and load that aims to progressing time response with FLC and PI controller in the closed loop system. The converter with the PI controller and FLC is look over and the fast responses are compared with time domain specifications. The simulation outcome indicates that the FLC based converter brings most excellent time domain response.

Interleaved DC-DC converter with coupled inductor is used in standalone Photovoltaic, battery charger/discharger applications. The main issue of the Interleaved DC-DC converter is that, it does not provide constant output voltage for a change in input voltage. Therefore, the converter efficiency is reduced. Hence to overcome this drawback, proper controller has to be used. In this paper, different control techniques such as PI, PID and Fuzzy logic controller are used. The simulation was carried out using MATLAB/Simulink and the results were compared. Fuzzy logic controller provides better regulated output voltage with less settling time.

In recent converter technology, same of energy loss in inductor used in that converter. So, Efficiency of converter is reduces because of this loss energy. This loss is minimizing by using coupled inductor with switch capacitor. The recommended structure consist voltage multiplier circuits with coupled inductor to get maximum voltage gain. Two capacitors are charged amid the turn off period utilizing stored energy of coupled inductor windings which helps to increase the voltage conversion efficiency. The leakage inductive current is recycled through the clamp circuit because of that the voltage stress on switch is reduced and durability of converter will increase as well as efficiency. In this paper, Converter in view of Coupled inductor and Switch Capacitor is analyzed by using MATLAB SIMULINK and hardware implementation.