Two-phase interleaved LLC resonant converter with current-controlled inductor

Orietti, E.; Mattavelli, Paolo; Spiazzi, G.; Adragna, Claudio; Gattavari, G.

doi:10.1109/cobep.2009.5347671

Cited by 102 publications

(27 citation statements)

References 4 publications

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“…Correspondingly, the timing diagram of the proposed converter is illustrated in Fig. 2 which is much similar to those shown in [7][8]. To support interleaving operation, two push-pull SRCs are connected in Correspondingly, the input current ripple will be suppressed also.…”

Section: Operation Principlementioning

confidence: 90%

“…1 where Lr1, Lr2 , Cr1 , Cr2 are the resonant inductors and capacitors, and D 5~D12 are the rectifier diodes. The circuit is modified from the conventional resonant converters with the resonant tank moved from the primary side to the secondary side [7][8]. Correspondingly, the timing diagram of the proposed converter is illustrated in Fig.…”

Section: Operation Principlementioning

confidence: 99%

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Intelligent high efficiency controller for 2-kW interleaved series resonant converters

Chen

Chiu

et al. 2013

2013 IEEE 10th International Conference on Power Electronics and Drive Systems (PEDS)

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The conventional series resonant converter (SRC) is not suitable for low input voltage and high output voltage DC/DC conversion applications. An interleaved SRC with a secondary-side resonant tank is presented in this paper to solve the resonant component design problem caused by small characteristic impedance (Zo). To support interleaving operation, two SRCs are connected in parallel with a 90 phase shift between the gating signals. Not only the input current ripple is reduced successfully, but also the device ratings can be decreased for cost saving. Without the direct support of commercial ICs, a full-custom interleaved SRC controller is designed instead. A 2-kW laboratory prototype with a 12-V input and a 200-V output is realized and tested to verify the feasibility of the proposed converter. The controller was fabricated in a TSMC 0.35μm 2P4M 3.3/5V CMOS process with a core area of 0.135 mm2 only. The duty cycle error among 4 driving signals is measured to be less than 1% and the power consumption of the controller is merely 4.8mW. The power conversion efficiency of the proposed interleaved SRC is as high as 93% from light to full load (20%~100%).I.

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Section: Operation Principlementioning

confidence: 90%

Section: Operation Principlementioning

confidence: 99%

Intelligent high efficiency controller for 2-kW interleaved series resonant converters

Chen

Chiu

et al. 2013

2013 IEEE 10th International Conference on Power Electronics and Drive Systems (PEDS)

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“…However, the control system of this approach is very complicated, which not only increase cost but also decrease system reliability. A method based on variable-inductor is proposed, in which a controlled DC current source is needed to change the value of inductor [21]. Obviously, the drawbacks of variable-inductor based approach are the same as the SCC based approach.…”

Section: Introductionmentioning

confidence: 99%

Zero-Vector-Injection Based Current Sharing Control of Interleaved Full-Bridge LLC Resonant Converters

Luo

et al. 2020

Energies

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Interleaved LLC resonant converters are widely used in various fields. However, interleaved LLC converters under Pulse Frequency Modulation (PFM) will lose the regulation of individual phases, causing a load sharing problem. Existing load sharing solutions have limitations; for example, phase shedding and current sharing cannot be realized at the same time. This paper proposed a novel current sharing method for interleaved full-bridge LLC resonant converters. Based on Zero-Vector-Injection, the voltage applied to the resonant tank is controlled to compensate for the difference in gain caused by component tolerance. The modulation strategy is proposed to maintain soft switching after Zero-Vector-Injection, and the phase shedding technique is also used to improve the efficiency at a light load. The detailed theoretical analysis and implementation method are proposed and validated using simulations. Experiments are also carried out to verify the feasibility of the proposed strategy based on a 2-phase 1.8 kW prototype.

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“…This configuration cannot operate with the redundancy operation. An interleaving method with a current controlled inductor is proposed in [14]. The interleaving method tuning the resonant frequency is proposed for constant frequency operation in ref.…”

Section: Introductionmentioning

confidence: 99%

An Interleaved PFM <italic>LLC</italic> Resonant Converter With Phase-Shift Compensation

Murata

Kurokawa

2016

IEEE Trans. Power Electron.

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The interleaved structure of LLC resonant converter with the phase shift modulation (PSM) is presented and then its optimum operating region is discussed. The LLC resonant converters can achieve zero voltage switching (ZVS) of the primary switches and zero current switching (ZCS) of the secondary switches. However, the secondary peak current is large due to the discontinuous conduction mode (DCM). The interleaved PFM LLC resonant converter has difficulty in synchronizing switching instants among phases owing to the parameter mismatch of resonant circuits. In the proposed method, the current unbalance caused by the parameter mismatch is compensated by PSM. It is confirmed that the proposed method achieves lower peak current even when there is parameter mismatch and that the operation of below resonant frequency is suitable, both of which are simulated and experimentally verified.Index Terms-LLC resonant converter, pulse frequency modulation, phase shift modulation, interleave.

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Two-phase interleaved LLC resonant converter with current-controlled inductor

Cited by 102 publications

References 4 publications

Intelligent high efficiency controller for 2-kW interleaved series resonant converters

Intelligent high efficiency controller for 2-kW interleaved series resonant converters

Zero-Vector-Injection Based Current Sharing Control of Interleaved Full-Bridge LLC Resonant Converters

An Interleaved PFM <italic>LLC</italic> Resonant Converter With Phase-Shift Compensation

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