Steady-State Analysis and Optimal Design of an LLC Resonant Converter Considering Internal Loss Resistance

Yoo, Jeong-Sang; Gil, Yong-Man; Ahn, Tai Young

doi:10.3390/en15218144

Cited by 10 publications

(8 citation statements)

References 35 publications

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“…As the circuit operates in resonance, the currents and voltages in the resonant tank can be approximated as sinusoidal. This approximation, known as First Harmonic Approximation (FHA), enables the analysis of the circuit to be greatly simplified while maintaining a satisfactory level of accuracy [31,32]. Under FHA, the square voltage v s can be approximated as v s 1 = (4/π)V DC sin(ωt) = (4/π)V s 1 sin(ωt), as shown in Figure 1b [4].…”

Section: Circuit Analysismentioning

confidence: 99%

Component design procedure for LCC‐S wireless power transfer systems based on genetic algorithms and sensitivity analysis

Corti,

Intravaia,

Reatti

et al. 2024

IET Power Electronics

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This paper introduces a novel approach for designing a Wireless Power Transfer (WPT) system with LCC‐S compensation. Since WPT systems operate under resonant conditions, even small deviations of the components from the nominal values can result in a significant reduction of the power transferred to the load, and in an increment of the circulating currents, reducing the system efficiency. The design techniques available today in the literature provide a unique combination of passive components capable of transferring a certain power to the load. This is a limitation, because, in practice, there are several combinations that allow reaching the desired output power, but they are usually neglected because they are extremely difficult to compute analytically. For this reason, in this paper, the authors present an innovative design procedure that enables, through a Genetic Algorithm, the identification of multiple feasible combinations of the LCC‐S components capable of achieving the desired output power. Moreover, the authors evaluate the effects of the component tolerances on the output power to determine which combinations are more robust to component variations. This task is performed by calculating the probability that a particular combination yields the desired output power, once the tolerances have been considered, following a Monte Carlo approach. This information is utilized to decide whether it is possible to reduce the component quality (worsening the tolerance) without affecting the performance. Finally, an optimal solution granting both low‐cost and robustness against component tolerances can be individuated. The proposed design procedure is applied to a case study and validated experimentally.

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Section: Circuit Analysismentioning

confidence: 99%

Component design procedure for LCC‐S wireless power transfer systems based on genetic algorithms and sensitivity analysis

Corti,

Intravaia,

Reatti

et al. 2024

IET Power Electronics

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Section: Introductionmentioning

confidence: 99%

“…The most used compensation topologies consist of adding one capacitor in series with each leakage inductance C p and C s (Figure 3). Both capacitors are chosen to be in resonance with each leakage inductance [20][21][22]. An indispensable stage in IPT circuits is the resonant tank, also known as resonant network, which is an electrical circuit designed with capacitors and inductors which is capable of storing electrical energy and oscillating when it is operating at the resonant frequency.…”

Section: Introductionmentioning

confidence: 99%

Inductive Compensation of an Open-Loop IPT Circuit: Analysis and Design

Ponce-Silva,

García-García,

Arau

et al. 2023

Inventions

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The main contribution of this paper is the inductive compensation of a wireless inductive power transmission circuit (IPT) with resonant open-loop inductive coupling. The variations in the coupling coefficient k due to the misalignment of the transmitter and receiver are compensated with only one auxiliary inductance in the primary of the inductive coupling. A low-power prototype was implemented with the following specifications: input voltage Vin = 27.5 V, output power Po = 10 W, switching frequency f = 500 kHz, output voltage Vo = 12 V, transmission distance d = 1.5 mm. Experimental results varying the distance “d” with several values of the compensation inductor demonstrate the feasibility of the proposal. An efficiency of 75.10% under nominal conditions was achieved. This proposal is a simple compensation topology for wireless chargers of cellular phones presenting small distances between the transmitter and receiver.

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“…A good way to achieve these objectives is to operate at high frequencies, as this reduces the size of the components that store energy, which reduces the cost of the total converter and increases the power density [4][5][6][7]. Usually, for these types of applications, resonant converters are the most widely used since they allow working at high frequencies and with soft switching, which greatly reduces switching losses [8][9][10]. The problem with operating at frequencies above 1 MHz is that it usually requires expensive programmable electronic cards, sophisticated semiconductors, and complex control methods applied at the inverter/rectifier stage when frequency multiplication is required.…”

Section: Introductionmentioning

confidence: 99%

Series RLC Resonant Circuit Used as Frequency Multiplier

et al. 2022

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Currently, the design of resonant power converters has only been developed while operating in the steady state, while the design operating in the transient stage has not been considered nor reported. This paper is interested in testing the performance of the resonant circuits operating in the transient stage and finding applications where benefits can be obtained from this form of operation. One application in which it is possible to obtain benefits from designing resonant circuits in the transient state is in the area of frequency multiplication. Usually, to achieve frequency multiplication, it is necessary to resort to complex methods and special devices that increase the complexity of the design and the total cost of the circuit. This paper evaluates the performance of a series RLC resonant circuit operating in the transient stage and with an underdamped response acting as a frequency multiplier, where the oscillation frequency of the current in the resonant tank is “n” number of times the switching frequency of the square voltage source at the input with a duty cycle of D = 50%. To validate the analysis, a circuit was designed to deliver an output power of 30 watts to a resistive load, where the switching frequency of the square voltage source at the input was 500 kHz. Since a multiplier value “n” equal to fifteen was chosen, the current in the resonant tank reached an oscillation frequency of 7.5 MHz. The design methodology was validated by simulations in SPICE, complying with the established design parameters.

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Steady-State Analysis and Optimal Design of an LLC Resonant Converter Considering Internal Loss Resistance

Cited by 10 publications

References 35 publications

Component design procedure for LCC‐S wireless power transfer systems based on genetic algorithms and sensitivity analysis

Component design procedure for LCC‐S wireless power transfer systems based on genetic algorithms and sensitivity analysis

Inductive Compensation of an Open-Loop IPT Circuit: Analysis and Design

Series RLC Resonant Circuit Used as Frequency Multiplier

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