A New-Variable-Coil-Structure-Based IPT System With Load-Independent Constant Output Current or Voltage for Charging Electric Bicycles

Li, Yong; Hu, Jiefeng; Chen, Feibin; Liu, Shunpan; Yan, Zhaotian; He, Zhengyou

doi:10.1109/tpel.2018.2812716

Cited by 72 publications

(47 citation statements)

References 18 publications

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“…The surface below the 1500 W plane meets the requirement of working in specific power output and DCM. i L1 gets smaller as L 1 gets bigger according to (13). L 1 equals to 400 µH from the above considerations.…”

Section: Design Process and Calculating Example A Proposed Systmentioning

confidence: 85%

Total Harmonic Distortion and Output Current Optimization Method of Inductive Power Transfer System for Power Loss Reduction

Zhang

Luo

et al. 2020

IEEE Access

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Inductive power transfer (IPT) system is widely used in material handling. A typical structure of the system takes an H-bridge inverter with an inductor-capacitor-inductor (LCL) resonant filter to realize a constant track current supplying changeless energy to the second side. However, the output voltage total harmonic distortion (THD) of the inverter increases, which causes the increase of output current circulation, when using voltage width control method to eliminate source voltage fluctuating. Therefore, a two-stage converter is proposed to optimize the output current circulation. The two-stage IPT system is composed of a boost converter cascaded with an H-bridge resonant inverter. The boost converter is employed to provide a higher and stable DC bus voltage. The H-bridge resonant inverter operates in a fixed width with a constant switching frequency. With the proposed topology, the THD of the high frequency voltage maintains the minimum value to realize minimum output current circulation in the LCL filter. The soft switching is realized to reduce the losses. Furthermore, expressions of coil and track model are presented by combining the theoretical analysis and finite element analysis (FEA). The experimental results show that over 76.6% efficiency is demonstrated in conditions of an 800 W load at the 14% source voltage fluctuation and the maximum efficiency was 78.6 %. The range of efficiency variation was 2% compared to a full-bridge system with voltage pluse-width control of which was 4.6%. INDEX TERMS Inductive power transfer (IPT), material handling, THD optimization, soft switching, finite element analysis (FEA).

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Section: Design Process and Calculating Example A Proposed Systmentioning

confidence: 85%

Total Harmonic Distortion and Output Current Optimization Method of Inductive Power Transfer System for Power Loss Reduction

Zhang

Luo

et al. 2020

IEEE Access

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“…Compared with methods [17,18] using two fixed frequency, the charge current and voltage of the proposed method have design freedom and the weight and cost of the secondary side are decreased. Compared with [19][20][21], the components of the secondary side are the same, but the charge current and voltage design freedom are missing in these methods. Though the ferrites on the secondary side are not needed in [22,23], the component number of the secondary side is larger than this work.…”

Section: Comparison With Other Methodsmentioning

confidence: 99%

“…However, these methods do not provide reconfigurable charge currents and voltages solution for batteries with various power ratings. (iv) Using hybrid compensation topologies to achieve CC-CV charging [19][20][21][22][23]. To simplify control strategies and to realise CC-CV charging, the methods of hybrid compensation topologies are investigated by some researchers.…”

Section: Introductionmentioning

confidence: 99%

Variable parameter and variable frequency‐based IPT charging system with configurable charge current and charge voltage

Qiao

Cui

Yang

2020

IET Power Electronics

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Variable parameter (VP) or variable frequency (VF) methods for load-independent output current or output voltage in inductive power transfer (IPT) systems have been widely studied. This study proposes an IPT system based on series-series compensation topology with VP and VF methods to achieve constant-current-constant-voltage (CC-CV) charging for electric bicycles (EBs). The proposed IPT system can operate in CC and CV modes regardless of load conditions at two different operating frequencies with corresponding values of compensation capacitors. The rating current/voltage of the proposed method is configurable by altering the compensation capacitor and operational frequency. Therefore, one charging stand can be shared by various EBs to save the space and to cut the overall cost. Only one capacitor is needed for one EB specification. The proposed IPT system can achieve zero-voltage switching under all load conditions. An experimental prototype with two ratings of 48 V/3A and 60 V/4A is built to verify the feasibility of the proposed method. The experimental results demonstrate the feasibility of the proposed method.

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“…However, this requires the coil to be split into many segments, and each segment should be connected to each relay switch. Another method of impedance reconfiguration is to use multiple capacitors and relay switches [9,18]. The drawback of these schemes is the use of relay switch.…”

Section: Proposed Dual-impedance-frequency Operationmentioning

confidence: 99%

Wireless Power Transfer under Wide Distance Variation Using Dual Impedance Frequency

Lee

Ahn

2020

Electronics

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A dual-impedance operation, where coil impedance is controlled by operating frequency selection, is proposed to maintain optimum reflected impedance across coupling variation. More specifically, this work focuses on how high coupling between coils presents excessively high reflected resistance to transmitter (Tx) inverters, degrading the efficiency and output power of the inverter. To overcome this problem, the proposed system is equipped with dual-impedance coil and selects high- or low-impedance coil based on the ability to operate both at 200 kHz and 6.78 MHz frequencies. The reactive impedances of 6.78 MHz coils are designed to be higher than that of 200 kHz coils. Since the reflected resistance is proportional to the coil impedances and coupling squared, at close distance with high coupling coefficient, 200 kHz coils with low coil impedances are activated to prevent an excessive rise in reflected resistance. On the other hand, at large distance spacing with low coupling coefficient, 6.78 MHz coils with high coil impedances are activated so that sufficient reflected resistance is obtained even under the small coupling. The proposed system’s advantages are the high efficiency and the elimination of bulky mechanical relay switches. Measured efficiencies are 88.6–50% across 10 coupling variations.

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A New-Variable-Coil-Structure-Based IPT System With Load-Independent Constant Output Current or Voltage for Charging Electric Bicycles

Cited by 72 publications

References 18 publications

Total Harmonic Distortion and Output Current Optimization Method of Inductive Power Transfer System for Power Loss Reduction

Total Harmonic Distortion and Output Current Optimization Method of Inductive Power Transfer System for Power Loss Reduction

Variable parameter and variable frequency‐based IPT charging system with configurable charge current and charge voltage

Wireless Power Transfer under Wide Distance Variation Using Dual Impedance Frequency

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