A Linearized Large Signal Model of an LCL-Type Resonant Converter

Li, Hongyu; Li, Xiao Dong; Lu, Ming; Hu, Song

doi:10.3390/en8031848

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…In addition, the electromagnetic interference (EMI) is restricted as well. Related to the above discussions, the resonant converter characterizes high efficiency, high power density and low EMI, and fits well with the high frequency applications [1][2][3][4][5].…”

Section: Introductionsupporting

confidence: 66%

A Study of Two Multi-Element Resonant DC-DC Topologies with Loss Distribution Analyses

et al. 2017

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Abstract:In this paper, two multi-element resonant DC-DC converters are analyzed in detail. Since their resonant tanks have multiple resonant components, the converters display different resonant characteristics within different operating frequency ranges. Through appropriate design, both of the two proposed converters successfully lower the conversion losses and, meanwhile, broaden the voltage gain ranges as well: one converter is able to take full usage of the third order harmonic to deliver the active power, and thus the effective utilization rate of the resonant current is elevated; while the another minimizes the entire switching losses for power switching devices by restricting the input impedance angle of the resonant tank. Besides, the loss distribution is analyzed for the purpose of guiding the component design. In the end, two 500 W prototypes are fabricated to test the theoretical analyses. The results demonstrate that the two proposed converters can achieve wide voltage gain with the small frequency deviation, which noticeably contributes to highly efficient conversion. Their peak efficiencies are measured as 95.4% and 95.3%, respectively.

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Section: Introductionsupporting

confidence: 66%

A Study of Two Multi-Element Resonant DC-DC Topologies with Loss Distribution Analyses

et al. 2017

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“…More recently, the dynamic analysis and control design of the LLC resonant converters have also received increasing research attentions [10][11][12][13][14] because modern energy conversion systems demand good dynamic performance and high reliability for DC-to-DC converters. The purpose of this paper is to develop a new control scheme that could enhance the dynamic performance and reliability of LLC series resonant converters adopted to modern energy conversion systems.…”

Section: Introductionmentioning

confidence: 99%

Current Mode Control for LLC Series Resonant DC-to-DC Converters

Jang¹,

Pidaparthy

Choi

2015

Energies

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Conventional voltage mode control only offers limited performance for LLC series resonant DC-to-DC converters experiencing wide variations in operational conditions. When the existing voltage mode control is employed, the closed-loop performance of the converter is directly affected by unavoidable changes in power stage dynamics. Thus, a specific control design optimized at one particular operating point could become unacceptable when the operational condition is varied. This paper presents a new current mode control scheme which could consistently provide good closed-loop performance for LLC resonant converters for the entire operational range. The proposed control scheme employs an additional feedback from the current of the resonant tank network to overcome the limitation of the existing voltage mode control. The superiority of the proposed current mode control over the conventional voltage mode control is verified using an experimental 150 W LLC series resonant DC-to-DC converter.

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“…Not all the models describing the performance of a PRC-LCC with capacitive output filter are equally easy to work with [32]. In some cases, different operation regions are identified in the performance of the topology.…”

Section: Large-signal Model and Steady-state Conditionmentioning

confidence: 99%

“…This model can be used for large-signal, small-signal and steady-state analysis. Focusing on the latter, a simple equivalent circuit can be used to represent steady-state performance ( Figure 3); reference [32] provides the details on how to obtain such an equivalent circuit. This steady-state model is better suited than those defining different operation regions, for it results in a set of equations that can be used for the whole range of operation (at steady state); these equations can also be adapted to any control mode.…”

Section: Large-signal Model and Steady-state Conditionmentioning

confidence: 99%

A Digitally Controlled Power Converter for an Electrostatic Precipitator

et al. 2017

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Electrostatic precipitators (ESPs) are devices used in industry to eliminate polluting particles in gases. In order to supply them, an interface must be included between the three-phase main line and the required high DC voltage of tens of kilovolts. This paper describes an 80-kW power supply for such an application. Its structure is based on the series parallel resonant converter with a capacitor as output filter (PRC-LCC), which can adequately cope with the parasitic elements of the step-up transformer involved. The physical implementation of the prototype includes the use of silicon carbide-SiC-semiconductors, which provide better switching capabilities than their traditional silicon-Si-counterparts. As a result, a new control strategy results as a better alternative in which the resonant current is maintained in phase with the first harmonic of the inverter voltage. Although this operation mode imposes hard switching in one of the inverter legs, it minimizes the reactive energy that circulates through the resonant tank, the resonant current amplitude itself and the switching losses. Overall efficiency of the converter benefits from this. These ideas are supported mathematically using the steady state and dynamic models of the topology. They are confirmed with experimental measurements that include waveforms, Bode plots and thermal behavior. The experimental setup delivers 80 kW with an estimated efficiency of 98%.

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A Linearized Large Signal Model of an LCL-Type Resonant Converter

Cited by 5 publications

References 23 publications

A Study of Two Multi-Element Resonant DC-DC Topologies with Loss Distribution Analyses

A Study of Two Multi-Element Resonant DC-DC Topologies with Loss Distribution Analyses

Current Mode Control for LLC Series Resonant DC-to-DC Converters

A Digitally Controlled Power Converter for an Electrostatic Precipitator

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