Current Balance Design for Inductive Power Transfer Systems with Secondary Multiple Parallel Branches

Luo, Mengna; Huang, Zhenwei; Zou, Bowei; Huang, Zhicong

doi:10.1109/iecon49645.2022.9968421

Cited by 1 publication

(4 citation statements)

References 11 publications

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“…The main methods for current balancing include adding combination of detuned resonant tank (DRT) and cross-coupling [21] and negative coupling inductance (NCL) [19] [20]. To compare with these methods, the same mutual inductance differences are used for the comparison of the current balance effect under axial offset (M 1 =17.4μH M 2 =17μH), and plane offset (M 1 =17.2μH, M 2 =14.8μH) condition.…”

Section: Methods Comparisonmentioning

confidence: 99%

“…Then α 2 is varied to control the current ratio to be one. After the values of α 1 and α 2 are determined by both the current balance controller and constant voltage controller, the phase angle γ can be calculated according to (21).…”

Section: Three Control Loopsmentioning

confidence: 99%

“…In order to address the current imbalance issue of dual-receiver systems, several methods are proposed to model the imbalanced receiver circuit and to mitigate the imbalanced currents [19]- [21]. The most typical current clamping phenomenon is analyzed in [19] by modeling the clamped rectifier as a totally turned-off device, and a method that utilizes the crosscoupling and detuned receivers is proposed to avoid the current clamping.…”

Section: Introductionmentioning

confidence: 99%

“…Because only the current clamping condition is modeled, the current imbalance is decreased by 55.8% but still exists. To further analyze the current imbalance, the rectifier and the load of each receiver are modeled as AC resistors with equal values in [20]- [21]. This method is applicable only when the output current of each receiver is the same and shows the trend of current change inaccurately.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An Accurate Modeling and Suppression Method for Current Imbalance in Dual-Receiver WPT Systems for Low-Voltage and High-Current Applications

Li,

Chen,

Liu

et al. 2024

IEEE Trans. Transp. Electrific.

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Wireless power transfer (WPT) technology is a convenient charging method for AGVs without manual operation. To satisfy the low voltage and high current requirement for charging AGVs, the dual-receiver WPT system is used to improve the current capacity and to decrease the current stress in coils and devices. However, the dualreceiver system suffers from current imbalance or even current clamping issues when the coupler misalignment occurs with different mutual inductance on each receiver channel. The current imbalance defeats the original purpose of the design and causes receiver overload and device overstress. Therefore, this paper presents an accurate model to describe the dual receiver currents under coupler misalignment. The key factors and reason of the current imbalance are studied accordingly and then guide the design of the coupler and the circuit of the dual-receiver system. Moreover, according to the practical demand, a comprehensive control strategy is proposed to achieve current balance and constant voltage output simultaneously. Finally, an experimental prototype of 48V/30A is built to validate the proposed method. The experimental results show that with the control strategy, the current difference can be decreased from 29.31A to 0.26A under various misalignment conditions, while the efficiency increases by 1.8%.

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Section: Methods Comparisonmentioning

confidence: 99%

Section: Three Control Loopsmentioning

confidence: 99%