Dynamic WPT system for EV charging with integrated energy storage

Ruddell, Steven; Madawala, Udaya K.; Thrimawithana, Duleepa J.

doi:10.1049/iet-pel.2018.5848

Cited by 13 publications

(10 citation statements)

References 24 publications

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“…Suppose t 1 in Figure satisfy (10), then the conduction angle is 2α. According to the characteristics of the full-bridge rectifier circuit of the capacitor filter (voltage source drive) type, the relationship between the AC side current I a and the DC side current I L is show in (11):…”

Section: B Analysis Of Output Characteristics For the Wpt Systemmentioning

confidence: 99%

“…However, the equivalent resistance of the battery gradually increases during the charging process which will have a certain impact on the output characteristics of the WPT system. For example, the actual charging current or charging voltage may deviate from the battery demand value and the overall efficiency may be lower, which is a big challenge for the design and control of the WPT system [8][9][10]. In order to solve the above problems, the charging control method of the WPT system has been studied by many scholars.…”

Section: Introductionmentioning

confidence: 99%

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The Charging Control and Efficiency Optimization Strategy for WPT System Based on Secondary Side Controllable Rectifier

Zhang

Tan

et al. 2020

IEEE Access

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The equivalent resistance of the battery will change during charging in practical applications, so it is difficult to design a wireless power transfer (WPT) system with accurate constant current (CC) and constant voltage (CV) output characteristics. In addition, the WPT system efficiency is also affected by the change of equivalent resistance. Therefore, this paper studies the charging control and efficiency optimization strategy for the WPT system with dynamic loads. The WPT system with a structure of doublesided LCC compensation topology and containing controllable rectifier circuit at the secondary side is established, and the working process of full-bridge controllable rectifier circuit is analyzed. Then the output characteristics of the WPT system are analyzed. The expressions of the optimal transmission efficiency and the optimal equivalent impedance of the full-bridge rectifier are derived. The relationships between the equivalent impedance of the capacitor-filtered full-bridge controllable rectifier circuit and the phase shift angle, the charging current and the phase shift angle are also obtained. In this paper, the CC and CV charging strategies based on phase shift control of controllable rectifier circuit and efficiency optimization strategy based on dynamic equivalent impedance matching are proposed, which can improve the WPT system transmission efficiency while realizing CC and CV charging. Finally, the effectiveness of the proposed control strategy is verified by simulation and experiment. The WPT system realizes CC charging mode and CV charging mode in turn when the load resistance changes from 5 Ω to 30 Ω, and the overall efficiency is up to 90.71% at the transmission distance of 15cm. INDEX TERMS Wireless power transfer, constant current/voltage charging, efficiency optimization, phase shift control, dynamic impedance matching.

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Section: B Analysis Of Output Characteristics For the Wpt Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Charging Control and Efficiency Optimization Strategy for WPT System Based on Secondary Side Controllable Rectifier

Zhang

Tan

et al. 2020

IEEE Access

View full text Add to dashboard Cite

show abstract

“…According to the principle of the buck-boost converter at continuous current mode (CCM), the relationship between input voltage Ul_dc and output voltage Ul is given by (8). The relationship between equivalent input resistance Rl_dc and load resistance Rl is given by (9).…”

Section: A Constant Output Voltage Controlmentioning

confidence: 99%

“…It has been applied in electric vehicles (EVs), smart phone and many other low-power fields like implantable medical electronics, and domestic appliances [3][4][5][6][7]. In general, constant current (CC) charging is necessary for batteries and supercapacitors [8][9][10]. However, as for some movable devices such as intelligent inspection robot (shown in Fig.1), the constant output voltage is the key to ensure its normal operation.…”

Section: Introductionmentioning

confidence: 99%

Maximum Efficiency Tracking for Dynamic WPT System Based on Optimal Input Voltage Matching

Wang

Liu

et al. 2020

IEEE Access

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Wireless power transfer (WPT) technology has drawn much attention due to its advantages such as safety, convenience, and non-contact. For some movable devices such as intelligent inspection robot, the constant output voltage is very important to ensure its normal operation. In order to improve the system efficiency and steadiness of output voltage, a maximum efficiency tracking and constant voltage charging method is proposed for the dynamic WPT system. In this method, the mutual inductance and optimal input voltage can be estimated accurately no matter the coupling coefficient and equivalent load change or not. The simulation and experimental results have shown that the WPT system realize maximum efficiency tracking and constant voltage charging when the resistance is changed from 10Ω to 5Ω, and the same result was achieved when the mutual inductance is altered from 20μH to 10μH. INDEX TERMS Wireless power transfer, optimal input voltage matching, maximum efficiency tracking

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“…Nowadays, the development of wireless sensor nodes (WSN) [1] has progressed from the implementing wake-up technologies [2] to the realization of even battery-free WSNs with low energy consumption. Battery-free based WSNs themselves can be supplied either by wireless power transfer (WPT) [3,4] or by adopting energy harvesting techniques to collect energy from one or several ambient sources [5][6][7][8]. However, energy harvesting solutions strongly depend on the availability of the ambient source in a certain environment and requires often a storage element, which help to over bridge periods of low energy availability.…”

Section: Introductionmentioning

confidence: 99%

Multiplexed Supply of a MISO Wireless Power Transfer System for Battery-Free Wireless Sensors

et al. 2020

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Multi-input single output wireless power transmission (MISO-WPT) systems have decisive advantages concerning flexible receiver position in comparison to single coil systems. However, the supply of the primary side brings a large uncertainty in case of variable positions of the secondary side. In this paper, a compact multiplexed primary side electronic circuit is proposed, which includes only one signal generator, a passive peak detector, a communication module, and a compensation capacitor. The novel approach has been studied and evaluated for a MISO-WPT system having a 16 coils on primary side and one coil on secondary side having the double diameter. Results show that a standard microcontroller, in this case an STM32, is sufficient for the control of the whole system, so that the costs and the energy consumption are significantly reduced. An activation strategy has been proposed, which allows to determine the optimal transmitting coil for each position of the receiving coil and to switch it on. The time-to-start-charging at different positions of the receiving coil and different number of neighbors has been determined. It remains in all cases under 2.5 s.This reduces the size of the supply circuit relative to the previous solutions. In [19], a multi-coil system with multiplexed solution is presented with a singular supply circuit. However, the selection of the appropriate coil requires dual MOSFET switches, which presents some similarity to a switch-based multi-coil system. Nevertheless, the control of the multi-coil system switches needs microcontrollers with a high number of pins. For that, in case of a big number of transmitting coils, an FPGA [22] is proposed as processing unit, leading to an increase of both energy consumption and costs.In this paper, we investigate the feasibility of a multiplexed circuit on the primary side supply approach, with the aim to reduce the circuit size and to control the system by a simple microcontroller with a limited number of pins. The main objective is to significantly decrease both energy consumption and system costs. To this end, we propose to use receiving coils having the double diameter of the transmitting coils. This is important to cover at least a singular transmitting coil for different possible positions on the top of the pad to power the device for all the possible positions. In order to enable the detection and the powering of even battery-free wireless sensor nodes, we propose that the communication between the transmitting and receiving coil is started from the transmitting side and supplied from the transferred energy on the secondary side.The paper is organized as follows: In Section 2, the primary side supply circuit for a system is presented. The description of the proposed multi-coil system control algorithm is detailed in Section 3. The experimental evaluation of the developed algorithm are reported in Section 4. Section 5 shows the analysis of the required time to start the charging process. A conclusion is provided in Section 6. Design of the Primar...

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Dynamic WPT system for EV charging with integrated energy storage

Cited by 13 publications

References 24 publications

The Charging Control and Efficiency Optimization Strategy for WPT System Based on Secondary Side Controllable Rectifier

The Charging Control and Efficiency Optimization Strategy for WPT System Based on Secondary Side Controllable Rectifier

Maximum Efficiency Tracking for Dynamic WPT System Based on Optimal Input Voltage Matching

Multiplexed Supply of a MISO Wireless Power Transfer System for Battery-Free Wireless Sensors

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