Design Considerations of Efficiency Enhanced <i>LLC</i> PEV Charger Using Reconfigurable Transformer

Wang, Haoyu; Shang, Ming; Shu, Dongdong

doi:10.1109/tvt.2019.2930551

Cited by 47 publications

(17 citation statements)

References 27 publications

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“…Considering that the technique [8] is based on the full-bridge diode rectifier, the wire cross-section of multi-tap secondary winding should be rated for the maximum output current. The MMR winding should be wound with wire rated for a twice higher current but twice fewer turns.…”

Section: State-of-the-art Multimode Rectifiersmentioning

confidence: 99%

“…For example, the gain range of the BFEI could be additionally adjusted by the reconfiguration of its topology from a full-bridge into a half-bridge [6] or a single-switch inverter [7] with a twice lower dc-ac gain G FE . Similarly, the equivalent turns ratio of the isolation transformer can be changed by the commutation of an auxiliary secondary winding [8] to achieve a step change in the G TX gain. Reconfigurations in both of these two stages could also be combined using a simple control [9] or a sophisticated hardware integration [10] to extend the dc voltage gain range further.…”

Section: Introductionmentioning

confidence: 99%

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Wide-Range Operation of High Step-Up DC-DC Converters with Multimode Rectifiers

et al. 2021

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This paper discusses the essence and application specifics of the multimode rectifiers in high step-up DC-DC converters. It presents an overview of existing multimode rectifiers. Their use enables operation in the wide input voltage range needed in highly demanding applications. Owing to the rectifier mode changes, the converter duty cycle can be restricted to a range with a favorable efficiency. It is shown that the performance of such converters depends on the front-end inverter type. The study considers current- and impedance-source front-end topologies, as they are the most relevant in high step-up applications. It is explained why the full- and half-bridge implementations provide essentially different performances. Unlike the half-bridge, the full-bridge implementation shows step changes in efficiency during the rectifier mode changes, which could compromise the long-term reliability of the converter. The theoretical predictions are corroborated by experimental examples to compare performance with different boost front-end inverters.

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Section: State-of-the-art Multimode Rectifiersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wide-Range Operation of High Step-Up DC-DC Converters with Multimode Rectifiers

et al. 2021

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“…The authors [15] reduce the conduction loss by adding a boost capacitor, however, it cuts the range of zero voltage switching. The literature [4]- [6], [16] reports an extended range of input voltage for photovoltaic and EV applications. Although they report stable performance over the extended range of the input voltage, the output voltage remains fixed.…”

Section: Introductionmentioning

confidence: 99%

“…The most common approach for the extended range of voltage gain is a frequency modulated LLC power converter. LLC converters show optimum performance when operating at the resonant frequency, the switching frequency has to swing in a wide range to achieve extended voltage gain, this results in degraded overall performance [4]. Moreover, the voltage regulation of LLC converters is load-dependent and affected by circuit parameters like resonant capacitance and magnetizing/resonant inductance [3].…”

Section: Introductionmentioning

confidence: 99%

A 2×3 Reconfigurable Modes Wide Input Wide Output Range DC-DC Power Converter

Bakar

Alam

Wardemark³

et al. 2021

IEEE Access

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There is an increasing demand for efficient and low-profile power converters in almost all industrial applications. Some require stable performance over a wide range of input voltages, whereas others require converters with a stable performance over a wide range of output voltages. In this regard, little work has been done to combine both requirements into one solution. This work suggests a unique solution that addresses both requirements at once. A power converter with 2x3 reconfigurable modes has been presented, able to operate with DC gains of 1, 2 and 4, which can be further extended to 8. The converter shows stable performance for the extended range of both input and output voltage. The flexible reconfigurable feature of the proposal can be applied in a variety of applications. Two reconfigurable modes on the input side can be configured following the variation in the line voltage to maintain a stable performance, and three reconfigurable modes for the output voltage, which raises the output voltage from 24V to 48V and 96V. The proposal is applied in an example application of a phase shifted full bridge converter. The converter is characterized for V in = 100-400V dc , P out = 1kW.

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“…For meeting the ever-increasing power requirement of battery charger, the power components inside power converter have to experience higher voltage and current stresses and so does the inductor of PFC circuit. To compare with other battery chargers, [18][19][20][21] the main contribution is that the proposed topology with a series voltage-divider input and a parallel currentsharing output is developed to enhance the power handling ability and reduce the voltage and current stresses on the components. That is, the series input of the two interleaved bridgeless PFC single stage resonant converters can share the input voltage and reduce the input ripple current effectively.…”

Section: Introductionmentioning

confidence: 99%

A high power‐factor lithium‐ion battery charger with series‐input parallel‐output dual bridgeless single‐stage resonant conversion circuit

Chang

Yan

et al. 2021

Int Trans Electr Energ Syst

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This study realizes a high power-factor lithium battery charger which integrates a bridgeless boost-type power-factor-correction converter and a full bridge LLC resonant circuit to constitute a single-stage topology. The developed lithium battery charger is featured with high power-factor, current and voltage stresses reduction on components by introducing a pair of converters using series-input and paralleloutput mechanism. The developed battery charger has the following advantages:(a) bridgeless structure reducing circuit losses; (b) resonant technique usage furnishing power switches with soft-switching; (c) constant current (CC) and constant voltage (CV) charging power regulation with frequency modulation scheme simplifying the trigger circuit complexity; (d) series-input and parallel-output dual converters topology sharing current, voltage stresses, and reducing the component rating; and (e) paired interleaved PFC (power-factor-correction) operation sharing current loading and thus increasing charging battery size. Finally, a prototype 2 kW battery charger with 220 V input voltage is implemented and realized. The experimental measurements reveal that the full load efficiency can reach 88% while the power factor exceeds 0.99. In the modulating charging power range, the maximum conversion efficiency can reach to 92%.

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Design Considerations of Efficiency Enhanced LLC PEV Charger Using Reconfigurable Transformer

Cited by 47 publications

References 27 publications

Wide-Range Operation of High Step-Up DC-DC Converters with Multimode Rectifiers

Wide-Range Operation of High Step-Up DC-DC Converters with Multimode Rectifiers

A 2×3 Reconfigurable Modes Wide Input Wide Output Range DC-DC Power Converter

A high power‐factor lithium‐ion battery charger with series‐input parallel‐output dual bridgeless single‐stage resonant conversion circuit

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