Influence of the junction capacitance of the secondary rectifier diodes on output characteristics in multi-resonant converters

Ditze, Stefan; Heckel, Thomas; März, Martin

doi:10.1109/apec.2016.7467973

Cited by 12 publications

(4 citation statements)

References 29 publications

(29 reference statements)

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“…Since the junction capacitance of the diodes must be recharged each time the rectifier is switched, additional operation modes occur, in which all rectifier diodes are in blocking state. As reported for other topologies of resonant dc-dc converters, the resulting deviation of the mode sequence from idealized considerations can have a remarkable impact on the output power, which also should be investigated during converter design [48].…”

Section: A Prototype Designmentioning

confidence: 99%

A Resonant Push–Pull DC–DC Converter With an Intrinsic Current Source Behavior for Radio Frequency Power Conversion

Weitz

Utzelmann

Ditze

et al. 2022

IEEE Trans. Power Electron.

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In this work, a resonant push-pull dc-dc converter suitable for switching frequencies in the MHz-range is investigated. Despite a simple design procedure with no need of multiresonant tuning, the converter topology is capable of providing a constant output current over a wide output voltage range in unregulated operation. Based on an analytical solution of steady-state operation, normalized dependencies of converter behavior are determined and used to formulate generalized design considerations. In order to verify the theoretical analysis, the design procedure of a 300 W prototype operating at a switching frequency of 6.78 MHz is described considering the impact of circuit parasitics on converter operation. The prototype provides a stable operation within the full output voltage range of 0-150 V and reaches a peak efficiency of 93% at the nominal output voltage. A rapid transient response of the converter is demonstrated by applying a closed-loop on/off-control to the prototype.

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Section: A Prototype Designmentioning

confidence: 99%

A Resonant Push–Pull DC–DC Converter With an Intrinsic Current Source Behavior for Radio Frequency Power Conversion

Weitz

Utzelmann

Ditze

et al. 2022

IEEE Trans. Power Electron.

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“…This ensures that the drainsource voltage v DS across the primary switches has dropped to zero before the resonant current i prim reaches a positive value, providing the condition for ZVS. Detailed operation principles, detailed analysis considering the operating modes, and methods for voltage regulation of the LLC resonant converter can be found in [59][60][61].…”

Section: Dc-dc Converter Stagementioning

confidence: 99%

“…known from the fundamental harmonic analysis (FHA), and is used to calculate L res and C res [47,63]. However, the FHA does not consider parasitic components (output and junction capacitances) and non-ideal control signals (dead time), which leads to inaccurate results [60]. In order to consider the influence of nonlinear capacitances and dead time on the output power and the ZVS condition, the parameters L res and L m are analyzed with a simulative approach.…”

Section: Design Of the Llc Resonant Convertermentioning

confidence: 99%

A High-Efficiency High-Power-Density SiC-Based Portable Charger for Electric Vehicles

et al. 2022

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This paper proposes a portable 11 kW off-board charger for electric vehicles. In the ac/dc stage, a three-phase power factor correction (PFC) in Vienna topology is chosen. The loss and volume of the PFC inductance are calculated over a wide range of parameters and optimized with regard to design, winding, and core material. A three-phase LLC resonant converter operating at 1 MHz is chosen for the galvanically isolated dc/dc stage. A parametrizable loss model of the high-frequency transformer and the resonance inductor is developed to minimize volume, weight, and losses. With the help of an automated algorithm using these loss models, the inductive components are optimized in terms of winding specification, magnetic material, and core geometry, verified by finite element analysis and measurements. For the ac/dc stage, 900 V SiC devices are adopted, and 1200 V SiC devices are used in the primary and secondary sides of the dc/dc stage. A variable dc-link voltage is utilized to adjust the charging profile and to operate the LLC resonant converter at the most efficient point near the series resonance frequency. A mechatronically integrated portable air-cooled off-board charger prototype with 11 kW, three-phase 400 VAC input, and 620–850 VDC output is realized and tested. The prototype demonstrates a power density of 2.3 kW/liter (37.7 W/in³), a peak efficiency of 96%, and 95.8% efficiency over the defined battery voltage range.

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“…In addition, the implementation of SR significantly reduces secondary-side losses. With the Si MOSFETs S 7 and S 8 additional parasitic capacitance and influences by the SR control are introduced, thereby increasing the voltage gain in step-down operation at high switching frequency [25], [26]. In order to still cover the entire constant-current and constantvoltage charging profile, burst mode operation is implemented for low output current operation [27].…”

Section: Electrical Concept a Topology And Controlmentioning

confidence: 99%

Miniaturization and Thermal Design of a 170 W AC/DC Battery Charger Utilizing GaN Power Devices

Weimer

Koch

Nitzsche

et al. 2022

IEEE Open J. Power Electron.

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This paper presents the design and analysis of a high-density two-stage battery charger for mid-power applications like small electric vehicles and high-performance laptops utilizing gallium nitride (GaN) power devices. In addition to adherence of maximum junction temperatures, a thermal analysis is carried out for in-housing operation, which is particularly critical for fanless wall chargers. Design measures include calorimetric semiconductor selection, half-bridge miniaturization, thermally conductive epoxy resin and reference-based convection modeling for thermally optimized component placement using 3D-stacking. Furthermore, the remaining optimization potential of the charger is estimated by virtual prototyping. A 170 W hardware prototype is developed and tested, achieving a two-stage power section efficiency of 95.4% with a maximum switching frequency of 550 kHz. This results in a power density in open-housing operation of 1.6 kW/dm 3 . Using epoxy resin, copper and graphite heat spreaders, an in-housing operation power density of 1.1 kW/dm 3 is achieved with minor reduction of output power due to surface temperature constraints.INDEX TERMS AC-DC power conversion, battery chargers, epoxy resins, gallium nitride, graphite.

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Influence of the junction capacitance of the secondary rectifier diodes on output characteristics in multi-resonant converters

Cited by 12 publications

References 29 publications

A Resonant Push–Pull DC–DC Converter With an Intrinsic Current Source Behavior for Radio Frequency Power Conversion

A Resonant Push–Pull DC–DC Converter With an Intrinsic Current Source Behavior for Radio Frequency Power Conversion

A High-Efficiency High-Power-Density SiC-Based Portable Charger for Electric Vehicles

Miniaturization and Thermal Design of a 170 W AC/DC Battery Charger Utilizing GaN Power Devices

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