A Voltage Quadrupler Rectifier Based Pulsewidth Modulated LLC Converter With Wide Output Range

Shang, Ming; Wang, Haoyu

doi:10.1109/tia.2018.2850033

Cited by 52 publications

(26 citation statements)

References 24 publications

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“…Fundamental harmonic approximation [5,28] technique is used to determine the voltage conversion ratio of the proposed converter. At the nominal operating point, the dc voltage conversion ratio is identical to that of the conventional LLC converter [6,21] and the peak gain conversion ratio can be achieved with FM expressed as…”

Section: Conversion Ratiomentioning

confidence: 99%

“…Fundamental harmonic approximation [5, 28] technique is used to determine the voltage conversion ratio of the proposed converter. At the nominal operating point, the dc voltage conversion ratio is identical to that of the conventional LLC converter [6, 21] and the peak gain conversion ratio can be achieved with FM expressed as

M = \frac{2 V_{normalo}}{V_{DC}} = \frac{1}{\sqrt{(][, {()(, 1 + K ()(, 1 - false(1 / F^{2} false)))}^{2} + {()(, Q ()(, F - false(1 / F false)))}^{2})}}

where

K = false(L_{m} / L_{r_eqv} false); Q = false(1 / ω_{normalo} C_{r} R_{ac} false); F = false(f_{normals} / f_{r} false)

.…”

Section: Design Considerationmentioning

confidence: 99%

“…The output voltage regulation of the conventional LLC resonant converter is achieved using frequency modulation (FM) technique [4][5][6][7][8]. In normal operating conditions (full load, unity gain at a resonant frequency) optimal design of the converter is guaranteed.…”

Section: Introductionmentioning

confidence: 99%

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Non‐isolated LLC resonant converter with suppressed circulating current and automatic resonant frequency matching capability

Dobi

Sahid

Sheikh

2020

IET Power Electronics

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This study proposed a novel non-isolated half-bridge Inductor-Inductor-Capacitor (HB LLC) resonant converter with automatic resonant frequency adjustment ability and a circulating current suppression auxiliary circuit. The proposed converter employs a hybrid modulation technique based on frequency modulation (FM) and pulse width modulation (PWM) to regulate the output voltage. At the nominal operating point, all the excellent attributes of a conventional LLC converter over the entire load range are maintained and output voltage control is achieved with FM. However, when the input voltage decreased to a level that LLC output voltage cannot be maintained with FM, the primary switches will operate at the minimum switching frequency and the auxiliary switch will be turned ON with PWM. The auxiliary switch is turned ON with zero-voltage switching and automatically matching the circuit resonant frequency with the switching frequency for optimal operation. The effective resonant inductor is energised directly from the dc bus storing more energy which is later released to the load to achieving high gain while maintaining the desired output voltage with a narrow frequency span. In addition, the converter exhibits low circulating current under an enhanced gain condition. Experimental results are presented on a 60 W prototype to validate the theoretical prediction. The proposed converter has a peak efficiency of 97%.

show abstract

Section: Conversion Ratiomentioning

confidence: 99%

“…Fundamental harmonic approximation [5, 28] technique is used to determine the voltage conversion ratio of the proposed converter. At the nominal operating point, the dc voltage conversion ratio is identical to that of the conventional LLC converter [6, 21] and the peak gain conversion ratio can be achieved with FM expressed as

M = \frac{2 V_{normalo}}{V_{DC}} = \frac{1}{\sqrt{(][, {()(, 1 + K ()(, 1 - false(1 / F^{2} false)))}^{2} + {()(, Q ()(, F - false(1 / F false)))}^{2})}}

where

K = false(L_{m} / L_{r_eqv} false); Q = false(1 / ω_{normalo} C_{r} R_{ac} false); F = false(f_{normals} / f_{r} false)

.…”

Section: Design Considerationmentioning

confidence: 99%

See 1 more Smart Citation

Non‐isolated LLC resonant converter with suppressed circulating current and automatic resonant frequency matching capability

Dobi

Sahid

Sheikh

2020

IET Power Electronics

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show abstract

“…Similarly, [16][17][18][19][20] explains the various control features used for energy management system in hybrid power network. The power electronic converter is playing a vital role in effective control of the EMS [21][22][23][24][25]. The grid connection issues like frequency deviation, voltage drop and control related issues are explained in [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Energy Management Strategy Using ANFIS Approach for Hybrid Power System

Suruli¹,

Ila²

2020

Teh. vjesn

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Renewable Energy Sources are the promising hopes of upcoming years as they are abundant in nature and available free of cost. In addition to this, these sources are pollution-free which makes them a perfect substitute for fossil fuels. A Hybrid Power System (HPS) is one that has multiple power generating sources like Photo Voltaic (PV) system, Wind turbine, Fuel cell, etc. interconnected to supply electric power for varying demand requirements with / without energy storage backup. This paper concentrates on the automation for control and integration of Renewable energy systems Viz. PV system, Solid Oxide Fuel Cell (SOFC) with Nickel-Metal-Hydride (Ni-MH) battery together with a variable load. The Proposed HPS mainly focuses on the use of PV which is 100% clean in nature with no toxic emissions on power generation. Here, the solar photovoltaic system with power extracting maximum by algorithm used as the major supply contributor in the HPS to meet with variable load demands. If there is a deficit of power supply from PV, the power from the Ni-MH battery / SOFC is utilized to meet the varying load demands. On the other hand, if there is excess supply from PV system, the excess energy will be stored in the Ni-MH battery. For efficient supply-demand balance, the HPS makes use of various control strategies namely Proportional Integral (PI) and Adaptive Neuro Fuzzy Inference System (ANFIS).

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“…The literature presents an LLC converter, which can operate at the resonant frequency all over the output voltage range via controlling the duty cycle of an additional switch on the secondary side. By doing so, the circulating current as well as the conduction loss can be reduced, and hence, an optimal efficiency can be obtained for a wide output voltage range.…”

Section: Introductionmentioning

confidence: 99%

Efficiency improvement for LLC converter based on automatic tuning of blanking time

Hwu

Guo

2019

Circuit Theory & Apps

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Summary As for the traditional LLC converter, there is a problem in efficiency at light load. In order to keep the output voltage of this converter constant at a given value at light load, the switching frequency will be increased, and hence, the efficiency would be degraded. Consequently, based on the inherent frequency modulation and from the point of view of blanking time tuning, the efficiency at light load will be further improved due to circular current reduction, and at the same time, the efficiencies under other operating conditions are also enhanced. In this paper, the strategy for automatically adjusting the blanking time is described and analyzed. Afterwards, the digital signal processor (DSP) is used as a circuit control kernel, and an experimental setup, with input voltage of 400 ± 10 V, rated output voltage of 12 V, and rated output current of 20 A, is provided to demonstrate the effectiveness of the proposed strategy.

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A Voltage Quadrupler Rectifier Based Pulsewidth Modulated LLC Converter With Wide Output Range

Cited by 52 publications

References 24 publications

Non‐isolated LLC resonant converter with suppressed circulating current and automatic resonant frequency matching capability

Non‐isolated LLC resonant converter with suppressed circulating current and automatic resonant frequency matching capability

Energy Management Strategy Using ANFIS Approach for Hybrid Power System

Efficiency improvement for LLC converter based on automatic tuning of blanking time

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