Simplified Optimal Trajectory Control for 1 MHz LLC Converter with Wide Input Voltage Range

Nabih, Ahmed; Ahmed, Mohamed H.; Li, Qiang; Lee, Fred C.

doi:10.1109/apec.2019.8722275

Cited by 12 publications

(2 citation statements)

References 8 publications

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“…OTC-based linear-nonliear step load control is optimized to achieve pulse load transient from no-load to fullload for LLC converter [26]. With a low-speed microcontroller (MCU) in a high-frequency LLC, two-step SOTC is realized digitally in [27,28]. To achieve optimal transient response at wide input voltages or gains, feed-forward compensation is proposed in conjunction with SOTC.…”

Section: Introductionmentioning

confidence: 99%

Transient response improvement of half‐bridge LLC resonant converter with full‐bridge rectifier for DC microgrid

Ma,

Cao,

et al. 2023

IET Renewable Power Gen

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LLC resonant converter has the features of low noise, high efficiency and power density, which is suitable to be integrated into DC microgrid. Due to severe stresses in the resonant tank, achieving fast and safe transient performance has been challenging for resonant converters. With less switch number and voltage stress, half‐bridge LLC resonant converter with full‐bridge rectifier (H‐F LLC resonant converter) are more suitable for high‐voltage application. To improve the transient response of the converter, this paper proposes a method based fixed center state trajectory for the converter to achieve soft start‐up. To reduce dynamic response time during start‐up, each step of fixed center state‐trajectory is designed optimally for the shortest path with symmetrical current limitation. In addition, the proposed method is also applicable to full‐bridge LLC converters. Moreover, according to the state‐plane analysis, load stepping‐up and stepping‐down transient state trajectories with the shortest path are carried out as well. To minimize the adverse effect of digital delay, fast load transient control based on 3D look‐up table is given based on FPGA‐EP3C25E144I7, which would also significantly reduce the computation requirement of the hardware controllers. The experimental results are verified on a 380V/12V LLC converter prototype at 130 kHz.

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Section: Introductionmentioning

confidence: 99%

Transient response improvement of half‐bridge LLC resonant converter with full‐bridge rectifier for DC microgrid

Ma,

Cao,

et al. 2023

IET Renewable Power Gen

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show abstract

“…In [24,25], a simplified optimal trajectory control for LLC converters was presented by assuming that the switching frequency equaled the resonant frequency. Thus, very fast dynamic performances were achieved, but the influence on the operation at other switching frequencies needs to be discussed.…”

Section: Introductionmentioning

confidence: 99%

LLC Resonant Converter as a Current Source Using Simple Trajectory Control

Grigorova

Vuchev

2023

Energies

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This paper discusses a simple method for controlling an LLC resonant DC-DC converter using a state space trajectory based on a linear combination of the voltage across the capacitor and the current through the inductance in the series resonant tank. An analysis of the converter using the state plane technique for the continuous current operation mode is proposed. The output, control and load characteristics of the converter, required for its design and application, are built for the different inductance ratios. They specify the limitations in the control range of the LLC resonant converter which result from the use of the control method. It is shown that under this control, the converter possesses linear control characteristics and has current source behavior. Therefore, the converter can successfully be used as a battery-charging device. Simulations of the converter’s operation, both in steady state and when the control parameter is changed significantly, are implemented. Studies using the model confirm that the considered simple trajectory control provides a fast dynamic response and stable operation of the LLC resonant converter, even in cases of a significant change in the control.

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Integrated All-GaN Driver for Non-isolated Resonant Converters

Yang,

Hsia,

2024

2024 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS)

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Simplified Optimal Trajectory Control for 1 MHz LLC Converter with Wide Input Voltage Range

Cited by 12 publications

References 8 publications

Transient response improvement of half‐bridge LLC resonant converter with full‐bridge rectifier for DC microgrid

Transient response improvement of half‐bridge LLC resonant converter with full‐bridge rectifier for DC microgrid

LLC Resonant Converter as a Current Source Using Simple Trajectory Control

Integrated All-GaN Driver for Non-isolated Resonant Converters

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