Analysis and design of a two‐transformer active‐clamping ZVS isolated inverse‐SEPIC converter

In this paper, a new multiport zero voltage switching dc-dc converter is proposed.Multiport dc-dc converters are widely applicable in hybrid energy generating systems to provide substantial power to sensitive loads. The proposed topology can operate in 3 operational modes of boost, buck, and buck-boost. Moreover, it has zero voltage switching operation for all switches and has the ability to eliminate the input current ripple; also, at low voltage side, the input sources can be extended. In addition, it has the ability of interfacing 3 different voltages only by using 3 switches. In this paper, the proposed topology is analyzed theoretically for all operating modes; besides, the voltage and current equations of all components are calculated. Furthermore, the required soft switching and zero input currents ripple conditions are analyzed. Finally, to demonstrate the accurate performance of the proposed converter, the Power System Computer Aided Design(PSCAD)/ Electro Magnetic Transient Design and Control(EMTDC) simulation and experimental results are extracted and presented. KEYWORDS input current ripple cancellation, nonisolated multiport dc-dc converter, soft switching, zero voltage switching

Section: Boost Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new topology for nonisolated multiport zero voltage switching dc‐dc converter

Babaei

Saadatizadeh

Heris

2018

“…It can be seen that in operation at the duty cycle range 1/3 ≤ D < 2/3, the maximum current ripple value of the proposed topology is 0.0083 occurs at D = 1/2, where this value is one‐third compared with Jin and Liu 23 and half value compared with Bal et al 51 While in operation at duty cycle range 2/3 ≤ D < 1, the current ripple of studied topology is higher than that of the converter in Bal et al 52 ; when the duty cycle is equal to 5/6, and the normalized current ripple is equal to 0.0083. Furthermore, the current ripple of the previously proposed converters in previous studies 26 , 51 is higher than that of the proposed topology, according to the values shown in Figure 12A. Also, the normalized current ripple cancellation of the proposed topology occurs when the duty cycle is 1/3 and 2/3, which means that the proposed topology has a better dynamic response and smaller size inductor.…”

Section: Mathematical Analyses and Fundamental Equationsmentioning

confidence: 82%

“…The dc voltage gain of NTBDCs is significantly limited; however, the dc voltage gain of ITBDCs is achieved by adjusting the transformer turns ratio; however, using high voltage transformers with a large number of turns also can introduce several problems, for instance, the leakage inductance and the parasitic capacitance of the transformer may cause voltage and current spikes, increased losses, and noises that degrade the converter performance. To overcome the previous disadvantages of the converters based on the transformer, the clamp circuit techniques are introduced to recycle the energy stored in the leakage inductance and absorb the voltage spikes on the main switch 38–45 . Although of drawback, the galvanic isolation has the following advantages: These are necessary for many industrial applications; the electrical grounds of the two electrical systems may be at different potentials; personnel safety; increases the filter's operation frequency; noise reduction; and correct operation of protection systems are the main reasons behind galvanic isolation.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome the previous disadvantages of the converters based on the transformer, the clamp circuit techniques are introduced to recycle the energy stored in the leakage inductance and absorb the voltage spikes on the main switch. [38][39][40][41][42][43][44][45] Although of drawback, the galvanic isolation has the following advantages: These are necessary for many industrial applications; the electrical grounds of the two electrical systems may be at different potentials; personnel safety; increases the filter's operation frequency; noise reduction; and correct operation of protection systems are the main reasons behind galvanic isolation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bidirectional isolated three‐phase dc‐dc converter using coupled inductor for dc microgrid applications

Kattel

Mayer

Possamai

et al. 2020

The main objective of this project is to study the analysis and design of an isolated three-phase bidirectional dc-dc converter connected to the dc microgrid system. The proposed topology achieves efficient power conversion with a wide input voltage range, continuous input current, and bidirectional operation. In forward mode operation, the topology acts as a three-phase push-pull converter to reach a step-up voltage conversion ratio (90 to 450 V). In backward mode operation, the converter acts as an interleaved flyback converter to provide a step-down voltage conversion ratio (450 to 90 V). Over and above that, in both operation senses, the dc voltage gain is presented. The main advantages of this topology are high-switching frequency, the three-phase transformer that provides galvanic isolation between the dc voltage link bus to the battery or ultra-capacitor storage, and input/output filters size reduction.Besides, a fewer number of power switches, the frequency of output voltage, and input current ripple are three times higher than the switching frequency.The three active switches are connected to the same reference, which simplifies the gate drive circuit. Ultimately, the theoretical analysis of the proposed topology is carefully confirmed with the experimental results of the 4 kW converter prototype. K E Y W O R D Sbidirectional dc-dc converter, coupled inductor, interleaved flyback, microgrid, push-pull converter, three-phase transformer

Two‐port network compact representation of resonator arrays for wireless power transfer with variable receiver position

Sandrolini

Simonazzi

Barmada

et al. 2022

This paper presents an equivalent circuit characterization of an array of resonators for wireless power transfer (WPT) applications. These apparatuses are composed of magnetically coupled resonant coils acting as a transmitter which feeds a receiver coil that can be placed over them at any position, allowing the tolerance of the system to the receiver misalignment to be dramatically enhanced. This advantage makes resonator arrays a suitable solution for both low-and high-power applications. The latter usually involve battery charging, with the resonator array acting as a transformer stage, ensuring galvanic isolation. An equivalent two-port network can be defined for any receiver position, allowing the array to be treated as a traditional transformer. Thereby, the simulation of the system can be simplified, as it is required in the design steps of a converter and control strategy. Analytical expressions of the two-port network parameters are proposed for arrays of any size and length. The formulas have been numerically and experimentally validated.battery charging, circuit modeling, inductive power transfer, resonator array, transformer, wireless power transfer | INTRODUCTIONIn the last decade, wireless power transfer (WPT) systems have become a convenient and reliable solution in many applications, ranging from powering portable electronic devices to automatic machines and electric vehicle (EV) charging. [1][2][3] These apparatuses offer many advantages, as the ability of operating in difficult environments or the possibility to transfer power to moving loads. The size and weight of high-power batteries can be reduced by more frequent charging, which can be dramatically eased by wireless chargers. Several different technologies have been proposed in literature for both stationary and dynamic charging. [4][5][6] For high-power transfer, among near-field WPT technologies, inductive power transfer (IPT) is largely employed. One of its major limits is the misalignment between the transmitter and receiver apparatuses, which dramatically affects the efficiency and the transferred power. In order to improve the tolerance to the misalignment, arrays of magnetically coupled resonating L-C circuits (also referred as relay coils) can be used, which represent a very cheap solution since only few passive electronic components are required. [7][8][9][10][11] In these systems, the power travels from the source to the load through the relay coils at the expense of an increased sensitivity to the mismatch between the input and output side impedances, 12,13 which reflects also on the magnetic near-field distribution. 14 Solutions to this problem have been proposed in Sandoval et al, 15,16 making arrays of