Frequency Tracking Control for a Capacitor-Charging Parallel Resonant Converter with Phase-Locked Loop

Sheng, Honggang; Pei, Yunqing; Yang, Xu; Wang, F.; Tipton, C.W.

doi:10.1109/apex.2007.357681

Cited by 8 publications

(7 citation statements)

References 17 publications

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“…In the reported literature, frequency tracking has been achieved for parallel resonant converter [25], [26] and LCC [27] by sensing the tank input current followed by a phaselocked loop. But this is not applicable for isolated topologies since the tank input current no longer remains in phase with the switching signals, due to the transformer magnetizing current [28].…”

Section: Emand For Dc-dc Converters For High Voltage Gain (A V )mentioning

confidence: 99%

Automatic Resonant Frequency Tracking in Parallel LLC Boost DC–DC Converter

Kundu

Chakraborty

Sensarma

2015

IEEE Trans. Power Electron.

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This paper proposes an automatic resonant frequency tracking scheme for resonant converters. A plant modeling approach is presented based on realistic ramp variation of resonant frequency due to slowly varying environmental conditions. The drift in resonant frequency is detected by observing the phase relationship of an electrical variable pair. A rigorous analysis is carried out to select the most suitable variable pair for phase comparison. The effects of circuit nonidealities on the proposed phase detection technique have been detailed. The proposed control technique has been implemented using low cost analog circuitry and is applied to a parallel LLC tank-based resonant boost dc-dc converter. Experimental results are presented on a 160-W prototype to validate the analytical predictions.

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Section: Emand For Dc-dc Converters For High Voltage Gain (A V )mentioning

confidence: 99%

Automatic Resonant Frequency Tracking in Parallel LLC Boost DC–DC Converter

Kundu

Chakraborty

Sensarma

2015

IEEE Trans. Power Electron.

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“…For the attainment of maximum gain in the LLC resonant converter, the converter is operated at resonant frequency [4], which, perhaps drifts due to variation in tank parameters and variation in input voltage, resulting in a gain reduction. The gain reduction can be avoided by turning the switching frequency to match the current resonant frequency [4, 30, 31].…”

Section: Circuit Analysis Of the Proposed Convertermentioning

confidence: 99%

Non‐isolated LLC resonant converter with suppressed circulating current and automatic resonant frequency matching capability

Dobi

Sahid

Sheikh

2020

IET Power Electronics

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This study proposed a novel non-isolated half-bridge Inductor-Inductor-Capacitor (HB LLC) resonant converter with automatic resonant frequency adjustment ability and a circulating current suppression auxiliary circuit. The proposed converter employs a hybrid modulation technique based on frequency modulation (FM) and pulse width modulation (PWM) to regulate the output voltage. At the nominal operating point, all the excellent attributes of a conventional LLC converter over the entire load range are maintained and output voltage control is achieved with FM. However, when the input voltage decreased to a level that LLC output voltage cannot be maintained with FM, the primary switches will operate at the minimum switching frequency and the auxiliary switch will be turned ON with PWM. The auxiliary switch is turned ON with zero-voltage switching and automatically matching the circuit resonant frequency with the switching frequency for optimal operation. The effective resonant inductor is energised directly from the dc bus storing more energy which is later released to the load to achieving high gain while maintaining the desired output voltage with a narrow frequency span. In addition, the converter exhibits low circulating current under an enhanced gain condition. Experimental results are presented on a 60 W prototype to validate the theoretical prediction. The proposed converter has a peak efficiency of 97%.

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“…In order to synchronize the converter and its switching frequency, most authors use phase‐locked loop (PLL) schemes . The phase‐shift between current and voltage is measured through an XOR gate and a low pass filter used to obtain a proportional voltage.…”

Section: Introductionmentioning

confidence: 99%

“…For implementing this control scheme, some authors use integrated circuits like the 4046 family , measuring directly the voltage and current or using gate signals instead of voltage measurements to reduce the cost of the equipment . In the last case, some include a compensator to take into consideration the delays in drivers and switches . Despite these differences, most authors using PLL systems use control schemes based on analog solutions.…”

Section: Introductionmentioning

confidence: 99%

All-digital DSP-based phase-locked loop for induction heating applications

Segura

Sala-Perez

Lopez-Mestre³

et al. 2012

Int. Trans. Electr. Energ. Syst.

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Phase-locked loop schemes are widely used in induction heating applications for controlling the converters.\ud Most authors use total or partial analog solutions to implement the control schemes, which are less sturdy\ud and flexible to changes than digital schemes. In this paper, an all-digital DSP-based PLL is presented. It\ud has fewer variations due to the tolerances of the analog components and provides great flexibility in a wide\ud range of conditions just by reprogramming. Moreover, it allows changing dynamically some of the parameters\ud during the process and opens up the possibility of more complex control algorithms. The all-digital\ud PLL has been simulated and experimentally tested, demonstrating the feasibility and reliability of this type of\ud control in a real industrial equipmentPostprint (published version

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Frequency Tracking Control for a Capacitor-Charging Parallel Resonant Converter with Phase-Locked Loop

Cited by 8 publications

References 17 publications

Automatic Resonant Frequency Tracking in Parallel LLC Boost DC–DC Converter

Automatic Resonant Frequency Tracking in Parallel LLC Boost DC–DC Converter

Non‐isolated LLC resonant converter with suppressed circulating current and automatic resonant frequency matching capability

All-digital DSP-based phase-locked loop for induction heating applications

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