An integrated voltage-current compensator of LLC resonant converter for Li-ion battery charger applications

Choi, Yeong-Jun; Choi, See-Young; Kim, Rae-Young

doi:10.1109/ipemc.2016.7512900

Cited by 3 publications

(4 citation statements)

References 18 publications

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“…The equivalent resistance modeling of the Li-ion battery used in previous research [18,19,23] has been derived based on the output voltage and current of the LLC converter, so it does not reflect the exact dynamic characteristics of the Li-ion battery pack. Therefore, in this paper, a more accurate battery model is obtained through frequency domain analysis of an actual battery pack.…”

Section: Li-ion Battery Pack Modelingmentioning

confidence: 99%

“…Also, Equation 21is obtained by solving only the cosine component in the same manner. Similarly, by substituting Equation (12) into Equation 3, the separated sine component is as shown in Equation 22and the separated cosine component is as shown in Equation (23). Finally, Equations (24) and (25) are derived by substituting Equation 13into Equation 6and separating only the sine and cosine components respectively, where the sine component of the magnetizing inductor current is defined as v ps and the cosine component is…”

Section: Of 18mentioning

confidence: 99%

“…Considering only the DC components of Equations (22) and (23), the relationships are expressed as follows:…”

Section: Of 18mentioning

confidence: 99%

“…In previous research [18,19,23], the compensator was designed by modeling the battery as an equivalent resistance. However, it cannot reflect all the dynamic characteristics of the battery, so it is difficult to guarantee stable operation in various situations.…”

Section: Introductionmentioning

confidence: 99%

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An Integrated Current-Voltage Compensator Design Method for Stable Constant Voltage and Current Source Operation of LLC Resonant Converters

et al. 2018

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This paper proposes a method to charge a lithium ion battery with an integrated compensator. Unlike the conventional charging method which uses separate voltage/current compensators based on a constant voltage-constant current charge profile, the proposed method uses a single compensator. The conventional method requires a complicated design process such as separate plant modeling for compensator design and the compensator tuning process in the frequency domain. Moreover, it has the disadvantage of a transient state between the mode change. However, the proposed method simplifies the complicated process and eliminates the transient response. The proposed compensator is applied to the LLC resonant converter and is designed to provide smooth and reliable performance during the entire charging process. In this paper, for the compensator design, the frequency domain models of the LLC resonant converter at the constant voltage and constant current charging mode are derived including the impedance model of the battery pack. Additionally, the worst condition of the compensator design during the entire charging process is considered. To demonstrate the effectiveness of the proposed method, the theoretical design procedure is presented in this paper, and it is verified through experimental results using a 300 W LLC converter and battery pack.

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Section: Li-ion Battery Pack Modelingmentioning

confidence: 99%