Efficiency improvement for LLC converter based on automatic tuning of blanking time

Hwu, K. I.; Guo, Yi-Siang

doi:10.1002/cta.2669

Cited by 4 publications

(7 citation statements)

References 13 publications

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“…In addition, optimal trajectory methods are used in [19,20]. Nevertheless, these components increase the size and weight of the system, resulting in a bulky design that adds to the overall cost of operation [21]. In [22,23], a fixed-frequency asymmetrical duty cycle (ADC) controlled converter was introduced that offers a distinct advantage: it incorporates built-in load short-circuit protection, eliminating the need for additional components.…”

Section: Related Workmentioning

confidence: 99%

Resonant DC/DC Converters: Investigating Phase-Shift Control

Reddy,

Bhaskar,

Subramaniam

2023

Energies

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The paper presents an innovative approach to control the voltage of an LCL-T type converter at the output side against variation at input and load ports, utilizing a fixed-frequency phase-shift control scheme. The examination of the converter is performed employing a Fourier series method that takes into account the effect of n-harmonics. To assure high-frequency switches with a zero-voltage switching (ZVS) technique, the lagging pf mode is utilized. PSIM simulations were used to investigate the performance of a 300 W converter. With the minimal input voltage, all switches turn on with ZVS for all loading conditions, whereas the ZVS strategy loses by two switches when the voltage at the input is highest. The power loss calculations of each component are performed and presented in a pie chart. The findings of the experiments are presented and verified with theoretical and simulation results. It is demonstrated that for both input voltage and load fluctuations, a minor adjustment in pulse width is sufficient to keep the output voltage constant.

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Section: Related Workmentioning

confidence: 99%

Resonant DC/DC Converters: Investigating Phase-Shift Control

Reddy,

Bhaskar,

Subramaniam

2023

Energies

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“…5 The zero-voltage switching (ZVS) and zero-current switching (ZCS) can be achieved in the LLC resonant converter, which ensures that it can transmit power with high efficiency and high switching frequency. [6][7][8] One conventional method of the modulation for LLC resonant converters is pulse frequency modulation (PFM). However, when the traditional LLC converters are adopted in the wide voltage gain range applications, a wide switching frequency range is inevitably required, which may bring difficulties to magnetic components and EMI filter design.…”

Section: Introductionmentioning

confidence: 99%

Dual LC parallel multi‐resonant DC‐DC converter with wide output‐voltage range

Zhao,

Shi,

Ding

et al. 2024

Circuit Theory & Apps

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SummaryAlthough LLC converters have widespread applications due to their advantages of high efficiency, high power density, and soft switching, in wide voltage gain range applications, a large switching frequency range is inevitably required, which may bring difficulties in converter design and efficiency improvement. In this paper, a dual LC parallel multi‐resonant converter (MRC) is introduced. The converter contains two parallel LC resonant branches in the resonant tank, which exhibit the notch filter characteristic on the gain curve. It enables the converter to provide wide voltage gain regulation, soft startup, and overcurrent protection over a limited frequency range. Compared to other five‐element MRCs, since the converter provides different current loops for the fundamental wave and the third harmonic to transmit active power, the circulating reactive energy and stress on the resonant components are reduced. Finally, a detailed design procedure for a 3.3 kW converter prototype with an output voltage range of 250–450 V is provided.

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“…In recent years, LLC resonant converters have been widely used in various fields due to their good soft switching characteristics in the full load range. [9][10][11][12] However, the resonant converter transmits energy through the resonant network. In the DC parallel system which is composed of parallel resonant converters, the difference in resonant parameters between different converters will cause the output current between the power modules to be unbalanced.…”

Section: Introductionmentioning

confidence: 99%

“…For the DC power supply system under this structure, how to solve the problem of unbalanced output current between modules is the primary consideration. In recent years, LLC resonant converters have been widely used in various fields due to their good soft switching characteristics in the full load range 9–12 . However, the resonant converter transmits energy through the resonant network.…”

Section: Introductionmentioning

confidence: 99%

Adaptive droop control strategy of parallel LLC converters

Tang,

Xu,

Pei

et al. 2023

Circuit Theory & Apps

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When the resonant converters are connected in parallel, the output current is unbalanced without additional current‐sharing measures due to differences in resonant component. In the input‐parallel output‐parallel resonant converter system, the output voltage accuracy of the converter under the traditional droop control is analyzed when the load changes. In this paper, an adaptive droop control is proposed, in which the droop coefficient is adaptively adjusted as the load changes. The control method proposed in this paper realizes the current sharing between the converters and solves the shortcomings of the output voltage changing under different loads in the conventional droop control. Taking two parallel LLC converters as an example, the control block diagram of the parallel control method for adaptive adjustment of the droop coefficient proposed in this paper is given, and the stability of the control loop is analyzed. Finally, two parallel prototypes of LLC converters with input 200 V/output 24 V input are built by digital control, and the experiment shows that the proposed control method improves the shortcomings of excessive output voltage droop caused by traditional droop control during dynamic load switching, which verifies the effectiveness of the method.

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Efficiency improvement for LLC converter based on automatic tuning of blanking time

Cited by 4 publications

References 13 publications

Resonant DC/DC Converters: Investigating Phase-Shift Control

Resonant DC/DC Converters: Investigating Phase-Shift Control

Dual LC parallel multi‐resonant DC‐DC converter with wide output‐voltage range

Adaptive droop control strategy of parallel LLC converters

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