Design consideration of CC-CV controller of LLC resonant converter for Li-ion battery charger

Park, Ki-Hyeon; Choi, Yeong-Jun; Choi, See-Young; Kim, Rae-Young

doi:10.1109/ifeec.2015.7361597

Cited by 10 publications

(8 citation statements)

References 12 publications

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“…Other improvement methods for CC-CV based charger are using on-off duty cycle control zero computational algorithms [15], and inductive power transmission with temperature protection [16]. The CC-CV based charger was also used in different charger topology, they are LLC resonant converter [17] and PFC Sheppard Taylor converter [18].…”

Section: Methodsmentioning

confidence: 99%

Implementation of a LiFePO4 battery charger for cell balancing application

Amin

Ismail

Hapid

2018

J. Mechatron. Electr. Power Veh. Technol.

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Cell imbalance has always happened in the series-connected battery. Series-connected battery needs to be balanced to maintain capacity and maximize the batteries lifespan. Cell balancing helps to dispart energy equally among battery cells. For active cell balancing, the use of a DC-DC converter module for cell balancing is quite common to achieve high efficiency, reliability, and high power density converter. This paper describes the implementation of a LiFePO4 battery charger based on the DC-DC converter module used for cell balancing application. A constant current-constant voltage (CC-CV) controller for the charger, which is a general charging method applied to the LiFePO4 battery, is presented for preventing overcharging when considering the nonlinear property of a LiFePO4 battery. The prototype is made up with an input voltage of 43V to 110V and the maximum output voltage of 3.75V, allowing to charge a LiFePO4 cell battery and balancing the battery pack with many cells from 15 to 30 cells. The goal is to have a LiFePO4 battery charger with an approximate power of 40W and the maximum output current of 10A. Experimental results on a 160AH LiFePO4 battery for some state of charge (SoC) shows that the maximum battery voltage has been limited at 3.77 volt and maximum charging current could reach up to 10.64 A. The results show that the charger can maintain battery voltage at the maximum reference voltage and avoid the LiFePO4 battery from overcharging.

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Section: Methodsmentioning

confidence: 99%

Implementation of a LiFePO4 battery charger for cell balancing application

Amin

Ismail

Hapid

2018

J. Mechatron. Electr. Power Veh. Technol.

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“…LLC 공진형 컨버터에 정전류-정전압 충전 방식을 적용한 기존연구들은 이러한 문제를 해결하기 위하여 다양한 해결책을 제시하였다 [11]- [14] . 그러나 대다수의 연구가 넓은 출력 전압, 출력 전류범위를 만족시키기 위한 최적 회로 파라미터 선정에만 초점을 맞춰왔다 [12], [13] .…”

Section: ˆ=unclassified

“…그러나 대다수의 연구가 넓은 출력 전압, 출력 전류범위를 만족시키기 위한 최적 회로 파라미터 선정에만 초점을 맞춰왔다 [12], [13] . LLC 공진형 컨버터의 동특성을 고려한 보상기 설계에 대한 연구 또한 존재 하였으나, 보상기 설계시의 최악 조건을 고려하지 않아 전체 충전구간 동안의 안정적인 동작이 보장되기 어려웠으며, 여전히 분리된 전압, 전류 보상기를 채택하여 설계가 복잡하며 모드 전환 시 과도상태가 존재한다 [14]- [17] . 일부 선행연구에서는 이러한 모드 전환시의 과도상태를 제거하기 위하여 추가 회로를 도입하였으나, 이 또한 하드웨어 증가로 인하여 복잡성이 증가 한다는 단점이 있다 [18], [19] .…”

Section: ˆ=unclassified

Design of an Integrated Current-Voltage Charging Compensator for the LLC Resonant Converter-Based Li-ion Battery Charger

최영준¹,

최시영²,

김래영³

2017

The Transactions of the Korean Institute of Power Electronics

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The conventional battery charger requires two separate voltage and current compensators to achieve constant current and constant-current-charging profile. This compensator configuration leads to an inevitable transient response during the mode change between the constant current and the constant voltage operation. Futhermore, a tedious and complicated design process is required to consider a widely changing battery voltage and the nonlinear electrical properties of Li-ion battery. This study proposes a single integrated voltage-current compensator of the LLC resonant converter for Li-ion battery charger applications to overcome the aforementioned drawbacks. The proposed compensator is designed to provide a smooth and reliable performance during the entire charging process while providing the reduced design efforts and seamless mode transient response. Several experimental results based on a 300 W prototype converter and its theoretical analysis are provided to verify the effectiveness of the proposed compensator.

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“…Conventional studies using constant-current and constant-voltage charging methods for LLC resonant converters have presented various solutions to solve these problems [15][16][17][18][19]. However, many studies have attempted hardware modifications to meet wide output voltage and output current ranges or have focused only on selecting optimal circuit parameters [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Although there have been studies on compensator design considering the dynamic characteristics of the LLC resonant converter, it is difficult to guarantee stable operation during the entire charging period without considering the worst condition when designing the compensator. Still, the separated voltage and current compensator has been adopted and the transient state exists at the time of mode switching [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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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Design consideration of CC-CV controller of LLC resonant converter for Li-ion battery charger

Cited by 10 publications

References 12 publications

Implementation of a LiFePO4 battery charger for cell balancing application

Implementation of a LiFePO4 battery charger for cell balancing application

Design of an Integrated Current-Voltage Charging Compensator for the LLC Resonant Converter-Based Li-ion Battery Charger

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

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