Hybrid Full-Bridge Three-Level LLC Resonant Converter—A Novel DC–DC Converter Suitable for Fuel-Cell Power System

Jin, Ke; Ruan, Xinbo

doi:10.1109/tie.2006.882020

Cited by 182 publications

(67 citation statements)

References 9 publications

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“…The front dc-dc converter for a PCS boosts the wide-drop voltage of a fuel cell to a higher level for the dc-ac inverter. The proposed front-end dc-dc converters are classified as boost converters [3]- [5], push-pull converters [6], [7], half bridge converters [8], fullbridge converters [9]- [16], wide input and high step-up dcdc converters [17], [18] or a LLC resonant converter [19]. In addition, conventional hard switching inverters [11], [12], [14], soft-switching inverters [6], [15] and high frequency link inverters [3], [4] have been presented as dc-ac inverters for PCSs.…”

Section: Introductionmentioning

confidence: 99%

An Isolated Soft-Switching Bidirectional Buck-Boost Inverter for Fuel Cell Applications

Zhang¹,

Xu²,

Chen³

et al. 2010

Journal of Power Electronics

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This paper presents a new isolated soft-switching bidirectional buck-boost inverter for fuel cell applications. The buckboost inverter combines an isolated DC-DC converter with a conventional inverter to implement buck-boost DC-DC and DC-AC conversion. The main switches achieve zero voltage switching and zero current switching by using a novel synchronous switching SVPWM and the volume of the transformer in the forward and fly-back mode is also minimized. This inverter is suitable for wide input voltage applications due to its high efficiency under all conditions. An active clamping circuit reduces the switch's spike voltage and regenerates the energy stored in the leakage inductance of the transformer; therefore, the overall efficiency is improved. This paper presents the operating principle, a theoretical analysis and design guidelines. Simulation and experimental results have validated the characteristics of the buck-boost inverter.

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Section: Introductionmentioning

confidence: 99%

An Isolated Soft-Switching Bidirectional Buck-Boost Inverter for Fuel Cell Applications

Zhang¹,

Xu²,

Chen³

et al. 2010

Journal of Power Electronics

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“…However, the voltage stress of the power switches in a conventional resonant converter is equal to the input voltage. In conventional three-level resonant converters [17], [18], the input split voltages cannot be balanced automatically in every switching cycle. This paper presents a new resonant converter with the functions of a low voltage stress of the power switches, low switching losses and balanced input capacitor voltages in every switching cycle.…”

Section: Introductionmentioning

confidence: 99%

A ZVS Resonant Converter with Balanced Flying Capacitors

Lin¹,

Chen²

2015

Journal of Power Electronics

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This paper presents a new resonant converter to achieve the soft switching of power devices. Two full-bridge converters are connected in series to clamp the voltage stress of power switches at V in /2. Thus, power MOSFETs with a 500V voltage rating can be used for 800V input voltage applications. Two flying capacitors are connected on the AC side of the two full-bridge converters to automatically balance the two split input capacitor voltages in every switching cycle. Two resonant tanks are used in the proposed converter to share the load current and to reduce the current stress of the passive and active components. If the switching frequency is less than the series resonant frequency of the resonant tanks, the power MOSFETs can be turned on under zero voltage switching, and the rectifier diodes can be turned off under zero current switching. The switching losses on the power MOSFETs are reduced and the reverse recovery loss is improved. Experiments with a 1.5kW prototype are provided to demonstrate the performance of the proposed converter.

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“…However, the ZVS condition of active switches is related to the load condition and input voltage so that it is difficult to implement ZVS turn-on for all switches over the entire load range. In order to extend the ZVS condition over the whole load range, resonant converters [18][19][20][21][22] have been proposed to achieve ZVS turn-on over the wide load range and input voltage variation. However, the ripple current at the output capacitor in resonant converter is higher than the output ripple current in the conventional half-bridge or full-bridge PWM converter.…”

Section: Introductionmentioning

confidence: 99%

Analysis of an Interleaved Resonant Converter for High Voltage and High Current Applications

Lin¹,

Chen²

2014

Journal of Electrical Engineering and Technology

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-This paper presents an interleaved resonant converter to reduce the voltage stress of power MOSFETs and achieve high circuit efficiency. Two half-bridge converters are connected in series at high voltage side to limit MOSFETs at V in /2 voltage stress. Flying capacitor is used between two series half-bridge converters to balance two input capacitor voltages in each switching cycle. Variable switching frequency scheme is used to control the output voltage. The resonant circuit is operated at the inductive load. Thus, the input current of the resonant circuit is lagging to the fundamental input voltage. Power MOSFETs can be turn on under zero voltage switching. Two resonant circuits are connected in parallel to reduce the current stress of transformer windings and rectifier diodes at low voltage side. Interleaved pulse-width modulation is adopted to decrease the output ripple current. Finally, experiments are presented to demonstrate the performance of the proposed converter.

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Hybrid Full-Bridge Three-Level LLC Resonant Converter—A Novel DC–DC Converter Suitable for Fuel-Cell Power System

Cited by 182 publications

References 9 publications

An Isolated Soft-Switching Bidirectional Buck-Boost Inverter for Fuel Cell Applications

An Isolated Soft-Switching Bidirectional Buck-Boost Inverter for Fuel Cell Applications

A ZVS Resonant Converter with Balanced Flying Capacitors

Analysis of an Interleaved Resonant Converter for High Voltage and High Current Applications

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