Phasor transformation and its application to the DC/AC analyses of frequency phase-controlled series resonant converters (SRC)

Rim, Chun T.; Cho, G.H.

doi:10.1109/63.53157

Cited by 188 publications

(73 citation statements)

References 13 publications

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“…An optimum CMRS can be designed based on the analytical results, as verified by experiments. A dynamic analysis of the CMRS using phasor transformations [15]- [17] is left for future work, which will complete the analyses of the CMRS. …”

Section: Discussionmentioning

confidence: 99%

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Frequency-Domain Circuit Model and Analysis of Coupled Magnetic Resonance Systems

Huh¹,

Lee²,

Choi³

et al. 2013

Journal of Power Electronics

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An explicit frequency-domain circuit model for the conventional coupled magnetic resonance system (CMRS) is newly proposed in this paper. Detail circuit parameters such as the leakage inductances, magnetizing inductances, turn-ratios, internal coil resistances, and source/load resistances are explicitly included in the model. Accurate overall system efficiency, DC gain, and key design parameters are deduced from the model in closed form equations, which were not available in previous works. It has been found that the CMRS can be simply described by an equivalent voltage source, resistances, and ideal transformers when it is resonated to a specified frequency in the steady state. It has been identified that the voltage gain of the CMRS was saturated to a specific value although the source side or the load side coils were strongly coupled. The phase differences between adjacent coils were π/2, which should be considered for the EMF cancellations. The analysis results were verified by simulations and experiments. A detailed circuit-parameter-based model was verified by experiments for 500 kHz by using a new experimental kit with a class-E inverter. The experiments showed a transfer of 1.38 W and a 40 % coil to coil efficiency.

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Section: Discussionmentioning

confidence: 99%

“…When all of the internal resistances are identical and the circuit parameters are symmetric as given in (14), (12) is drastically simplified to (15).…”

Section: B Further Simplification Of a Symmetric Circuitmentioning

confidence: 99%

Frequency-Domain Circuit Model and Analysis of Coupled Magnetic Resonance Systems

Huh¹,

Lee²,

Choi³

et al. 2013

Journal of Power Electronics

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show abstract

“…The formulation is based upon the principle that a generic form of sine waveform (voltages or currents in this case) can be approximated by a sinusoid whose frequency and amplitude vary with time [8], [9] (6) where is the complex envelope of and is the switching frequency. Considering the differential equation governing the behavior of an ideal inductor (7) and substituting (6) into (7) for both current and voltage gives the generic expression (8) Simplifying gives (9) In a similar manner, capacitors and resistors are described by (10a) (10b) More generally, therefore, a signal envelope can be expanded into its constituent real and imaginary components, denoted by " " and " " subscripts, respectively (11) For the inductor, substituting (11) into (9) and separating the real and imaginary terms gives (12a) (12b) and similarly for the capacitor and resistor…”

Section: Phasor-transform Modelmentioning

confidence: 99%

Self-Oscillating Control Methods for the LCC Current-Output Resonant Converter

Gilbert

Bingham

Stone

et al. 2008

IEEE Trans. Power Electron.

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Abstract-A strategy for self-oscillating control of LCC current-output resonant converters, is presented, based on varying the phase-angle between the fundamental of the input voltage and current. Unlike other commonly employed control methodologies, the proposed technique is shown to provide a convenient, linear system input-output characteristic suitable for the design of regulators. The method is shown to have a similar effect as controlling the dc-link supply voltage, in terms of output-voltage/current control. The LCC converter variant is used as an application focus for demonstrating the presented techniques, with simulation and experimental measurements from a prototype converter being used to show the practical benefits. Third-order small and large-signal models are developed, and employed in the formulation of robust output-voltage and output-current control schemes. However, notably, the presented techniques are ultimately generic and readily applicable to other resonant converter variants. Index Terms-Zero current switching (ZCS), zero voltage switching (ZVS).

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“…Instead, by means of the Fourier coefficients, it describes the "slow" variation of the amplitude of the state variables. This method is similar to the time-varying phasor analysis presented in (Rim & Cho, 1990), which introduces a modified phasor ( ) Xt , defined by:…”

Section: Converter Modelling By Averaging Techniquesmentioning

confidence: 99%