Bang-Bang charge control for LLC resonant converters

Hu, Zhiyuan; Wang, Laili; Liu, Yanfei; Sen, P.C.

doi:10.1109/ecce.2013.6646692

Cited by 25 publications

(16 citation statements)

References 11 publications

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“…The input power of each cycle can be then controlled directly. Thus, very fast dynamic response is achieved without complicated sensing or performance degradation [34].…”

Section: B Bang Bang Charge Control For Fast Dynamic Responsementioning

confidence: 99%

Latest Advances of LLC Converters in High Current, Fast Dynamic Response, and Wide Voltage Range Applications

Chen¹,

Liu²

2017

CPSS TPEA

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Abstract-LLC converter has been the simplest topology since long to achieve soft switching and overall the highest performance within small form factor at converter level. This paper discusses the latest advances of LLC converter from the perspective of topology and control. The technology ranges from high current, fast dynamic response to wide operational voltage range. The application mainly falls in the scope of server and data center, and may also cover telecom, PV, battery charging, etc.Index Terms-LLC, review, survey, current sharing, multiphase, interleave, phase shedding, passive impedance match, SR drive, fast dynamic, current mode control, current sensing, wide voltage range, hold up, high voltage gain.

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“…The input power of each cycle can be then controlled directly. Thus, very fast dynamic response is achieved without complicated sensing or performance degradation [34].…”

Section: B Bang Bang Charge Control For Fast Dynamic Responsementioning

confidence: 99%

Latest Advances of LLC Converters in High Current, Fast Dynamic Response, and Wide Voltage Range Applications

Chen¹,

Liu²

2017

CPSS TPEA

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“…Content may change prior to final publication. typical value of k is set at 4-7 [20]- [23], so k=5 in this paper, and A o is drawn in Fig. 3.…”

Section: Small-signal Properties Of Llc Resonant Convertersmentioning

confidence: 99%

Adaptive Voltage Controlled Oscillator for Improved Dynamic Performance in LLC Resonant Converter

Kang

Kim

Cho

2015

IEEE Trans. on Ind. Applicat.

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IEEE Transactions on Industry Applications(a) (b) Fig. 1. Over wide operating conditions, the variation of (a) switching frequency, (b) frequency response of frequency-to-output voltage transfer function.Abstract --This paper proposes an adaptive voltage controlled oscillator (VCO) to improve the dynamic performance in LLC resonant converters. The proposed adaptive VCO is designed to have frequency-dependent small-signal gains so that the variation of low frequency magnitude in frequency response of LLC resonant converter is effectively adjusted. As a result, an enhanced dynamic performance is obtained over wide operating ranges. Through approximated derivation, the proposed adaptive VCO has a simple formula and does not require any additional sensing circuits. Furthermore, it is robust to variation of circuit parameters. Dynamic performance enhancement was verified by experimental results with a 144-W laboratory prototype half-bridge LLC resonant converter.Index Terms--LLC resonant converter, voltage controlled oscillator (VCO), adaptive gain, dynamic performance.

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“…However, the compensation network design of LLC resonant converter is relatively challenging since the frequency response of the LLC resonant converter with voltage mode control has very complicated characteristics with four poles where the location of the poles changes with input voltage and load condition [10][11][12]. To improve the dynamic response of the LLC resonant converter, a number of research works have been done on the various control method [13][14][15][16][17][18]. Average mode control is employed in [13] to improve the dynamic response.…”

Section: Introductionmentioning

confidence: 99%

“…Since the charge of the switch current is proportional to the average input current over one switching cycle, charge control provides a fast inner loop and offers excellent transient response including inherent line feedforward. The bang-bang charge control proposed in [18] has demonstrated that the charge control can improve the dynamic response of the LLC resonant converter significantly. However, this method requires complicated circuit including input voltage sensing to generate two variable thresholds for the hysteresis band, which makes it difficult to guarantee same duty cycle for two switches against circuit tolerance.…”

Section: Introductionmentioning

confidence: 99%

Charge current control for LLC resonant converter

Choi

2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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This paper proposes a charge current control method for LLC resonant converter where the total charge of the switch current is compared with the control voltage to modulate the switching frequency. Since the proposed control method uses resonant current for only a half switching cycle together with duty cycle balancing circuit, the circuit can be implemented easily with analog circuit. The charge control makes the system single pole system allowing easy compensation design. Since the charge of the switch current is proportional to the average input current over each switching cycle, it also allows constant power limit. The proposed method has been implemented and tested on a 225W LLC resonant converter.I.

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Bang-Bang charge control for LLC resonant converters

Cited by 25 publications

References 11 publications

Latest Advances of LLC Converters in High Current, Fast Dynamic Response, and Wide Voltage Range Applications

Latest Advances of LLC Converters in High Current, Fast Dynamic Response, and Wide Voltage Range Applications

Adaptive Voltage Controlled Oscillator for Improved Dynamic Performance in LLC Resonant Converter

Charge current control for LLC resonant converter

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