Novel Hybrid LLC Resonant and DAB Linear DC–DC Converter: Average Model and Experimental Verification

Liu, Chuang; Liu, Haiyang; Cai, Guowei; Cui, Shumei; Liu, Haijun; Yao, Hang

doi:10.1109/tie.2017.2682784

Cited by 58 publications

(35 citation statements)

References 29 publications

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“…To again ensure voltage of , 5 does reach zero, (33) is derived, which upon reorganized, gives (34). Equation 34is thus the boundary condition of the output full bridge, which upon fulfilled, guarantees ZVS of 5 when driven by SPS during discharging.…”

Section: -Applying Conventional Sps With No DC Voltage Component Ormentioning

confidence: 99%

“…According to (40), deadtime of the discharging output full bridge using the proposed modulation scheme can also be expressed as (44), which upon substituted with expressions for 4 in (39) and 4 in (41), yields (45). (41) (15), (25), (27), (34), and (43), maps in Fig. 8 can then be obtained for projecting soft-switching and hardswitching regions of the DAB when it discharges with different load and output dc voltage conditions.…”

Section: Voltage Acrossmentioning

confidence: 99%

“…Attractiveness of these techniques are therefore not always justified, especially if they introduce strong nonlinearities to the DAB, which may toughen its controller design and stability analysis. As a result, SPS and its improvements like the Quasi-SPS proposed in this paper may be better choices, if dynamics and simple analysis for predicting stability are of greater concerns [32][33][34]. A test platform has been established for verification, as shown in Fig.…”

Section: Comparison With Other Modulation Schemesmentioning

confidence: 99%

See 2 more Smart Citations

A Dual Active Bridge Converter With an Extended High-Efficiency Range by DC Blocking Capacitor Voltage Control

Qin

Shen

Loh

et al. 2018

IEEE Trans. Power Electron.

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A Dual Active Bridge (DAB) converter can achieve a wide high-efficiency range when its input and output voltages are equal, assuming a 1:1 turns ratio for its isolation transformer. If its input or output voltage is doubled, efficiency of the DAB will drop significantly, because of the introduction of hard switching and high circulating power. Thus, a new modulation scheme has been proposed, whose main idea is to introduce a voltage offset across the dc blocking capacitor connected in series with the transformer. Operational principle of the proposed modulation has been introduced, before analyzing its soft-switching area and circulating power mathematically. The final modulation scheme is not difficult to implement, but can help the DAB achieve soft switching, low circulating power, and thereby high efficiency, even with its input or output voltage doubled. These features have been verified by experimental results obtained with a 1.2 kW prototype.

show abstract

Section: -Applying Conventional Sps With No DC Voltage Component Ormentioning

confidence: 99%

Section: Voltage Acrossmentioning

confidence: 99%

Section: Comparison With Other Modulation Schemesmentioning

confidence: 99%

See 1 more Smart Citation

A Dual Active Bridge Converter With an Extended High-Efficiency Range by DC Blocking Capacitor Voltage Control

Qin

Shen

Loh

et al. 2018

IEEE Trans. Power Electron.

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show abstract

“…However, this time domain analysis method requires knowing the details of all circuit topology and control strategies of the whole system and establishing the time-domain state space model. The modeling process is very complex [8][9][10]. In order to adapt to a complex cascade system structure, a frequency domain analysis method based on the impedance model can be used.…”

Section: Introductionmentioning

confidence: 99%

Impedance Modeling and Stability Analysis for Cascade System of Three-Phase PWM Rectifier and LLC Resonant Converter

Wang

Yu-yang

et al. 2018

Energies

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In this paper; the impedance model of PWM rectifier and LLC resonant converter are deduced, and the stability analysis of cascade system is studied. The principle of three-phase PWM rectifier is introduced; and the small signal model in d-q coordinate system is deduced. The expression of dc side output impedance model for PWM rectifier is derived. The LLC resonant converter is operated in a fixed-frequency state, and the LLC resonant converter is modeled as a small signal model. On this basis, the input impedance model expression of the LLC resonant converter is derived. According to the impedance stability criterion, it can seen that the amplitude of input impedance is greater than the amplitude of output impedance in a certain frequency domain. In addition, the Nyquist curve is not around the point (−1,0), which can judge that the cascade system is stable. In simulation software, a cascade system simulation is built and corresponding simulation curves are obtained, which verifies the stability of the cascade system.

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“…In order to get other something important, complex analytic variables need to be taken full use of. In [ 35 ] and [ 36 ], seventh-order state equations which contain real and imaginary parts are used. Average absolute primary current and output voltage are the output variables of converter.…”

Section: Introductionmentioning

confidence: 99%

An improved large signal model of full-bridge LLC converter

Yao

Liu

2018

PLoS ONE

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For the full-bridge LLC converter, it is necessary to establish a large signal model with low-complexity and high-precision when the current of filter inductor works under the continuous conduction mode (CCM) situation. In terms of low complexity, peak values of resonant state variables and average values of slow state variables are taken as the measured indexes between models and actual converter. Models based on the first harmonic approximation (FHA) are studied in depth because they have lower complexity than the existing models. From prospective of high precision, deficiencies of typical FHA model are explained in the light of harmonic generation mechanism of primary current and influence of Fourier series on the typical equivalent circuit. Therefore, transient process of each metallic oxide semiconductor field effect transistor (MOSFET) and its related fast recovery diode, transient process of Schottky rectifier diodes, piecewise equivalent circuit, appropriate selection of variables, and simplified modified dynamic equations are all considered. Furthermore, the unified proposed model is achieved according to the equivalent principle of indexes between aforementioned improved analyses and proposed model. Numerical results of typical FHA model and proposed model are given in accordance with the key indexes. Then, corresponding experimental results are also presented. Differences of indexes between the two models and the actual converter are compared respectively. Though complexity of proposed model is the same as that of typical FHA model, precision of proposed model is higher than that of typical FHA model.

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Novel Hybrid LLC Resonant and DAB Linear DC–DC Converter: Average Model and Experimental Verification

Cited by 58 publications

References 29 publications

A Dual Active Bridge Converter With an Extended High-Efficiency Range by DC Blocking Capacitor Voltage Control

A Dual Active Bridge Converter With an Extended High-Efficiency Range by DC Blocking Capacitor Voltage Control

Impedance Modeling and Stability Analysis for Cascade System of Three-Phase PWM Rectifier and LLC Resonant Converter

An improved large signal model of full-bridge LLC converter

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