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Prof. Dr. Eric Ka-Wai Cheng
Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China

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Journal article
Published: 09 July 2021 in Electronics
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Receiver-side control has been a reliable practice for regulating the transferred energy to the batteries in the electric vehicle (EV) wireless power transfer (WPT) systems. Nonetheless, the unpredictable fluctuation of the mutual inductance in dynamic wireless charging brings extreme instability to the charging process. This overshoot that appears in instant vibrations may largely increase the voltage/current stress of the system, and even cause catastrophic failure in the battery load. In addition, the speed of the vehicles may lead to untraceable steady-state operation. However, existing solutions to the above two issues suffer from either long communication time delay or significantly compromised output regulation. In this paper, the slow dynamics and the overshoot issues of the WPT system are elaborated in theory, and the small-signal model mainly considering mutual inductance disturbance is established. A simple feedforward control is proposed for overshoot damping and fast system dynamics. Experimental results validate that the overshoot can be reduced by 13% and the settling time is improved by 50% in vehicle braking or acceleration. In constant speed driving, the battery charging ripple is decreased by 12% and ensures better system stability.

ACS Style

Kaiwen Chen; Ka Cheng; Yun Yang; Jianfei Pan. Stability Improvement of Dynamic EV Wireless Charging System with Receiver-Side Control Considering Coupling Disturbance. Electronics 2021, 10, 1639 .

AMA Style

Kaiwen Chen, Ka Cheng, Yun Yang, Jianfei Pan. Stability Improvement of Dynamic EV Wireless Charging System with Receiver-Side Control Considering Coupling Disturbance. Electronics. 2021; 10 (14):1639.

Chicago/Turabian Style

Kaiwen Chen; Ka Cheng; Yun Yang; Jianfei Pan. 2021. "Stability Improvement of Dynamic EV Wireless Charging System with Receiver-Side Control Considering Coupling Disturbance." Electronics 10, no. 14: 1639.

Journal article
Published: 01 May 2021 in Energies
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In order to improve the customers’ continuous usage of electrical vehicles (EVs) and reduce the weight of the energy storage devices, wireless charging technology has been widely studied, updated, and commercialized in recent decades, regarding to its distinct superiority of great convenience and low risk. A higher coupling coefficient is the key factor that impacts the transmission efficiency, thus in most medium-power (hundreds of watts) to high-power (several kilowatts) wireless charging systems, ferrites are used to guide the magnetic flux and intensify the magnetic density. However, the weight of the ferrite itself puts an extra burden on the system, and the core loss during operation also reduces the total efficiency and output power. This paper proposes an optimized design algorithm based on a core-less method for the magnetic core, where the core loss and the coupling coefficient are consequently balanced, and the overall weight and efficiency of the system can be optimized. The iteration procedure is applied on the basis of removed ferrite length and thickness in the algorithm. In the simulation, a square coupler with a total volume of 300 mm × 150 mm, a circular coupler of 150 mm × 150 mm and a Double-D (DD) coupler of 300 mm × 150 mm are used to verify the advantages of the proposed method. The optimized ferrite structures are specific for each coupler shape, and the improvement is proved to be universal in current scale by means of 3-D finite element analysis.

ACS Style

Kaiwen Chen; Jianfei Pan; Yun Yang; Ka Cheng. Optimization of Ferrites Structure by Using a New Core-Less Design Algorithm for Electric Vehicle Wireless Power Transfer. Energies 2021, 14, 2590 .

AMA Style

Kaiwen Chen, Jianfei Pan, Yun Yang, Ka Cheng. Optimization of Ferrites Structure by Using a New Core-Less Design Algorithm for Electric Vehicle Wireless Power Transfer. Energies. 2021; 14 (9):2590.

Chicago/Turabian Style

Kaiwen Chen; Jianfei Pan; Yun Yang; Ka Cheng. 2021. "Optimization of Ferrites Structure by Using a New Core-Less Design Algorithm for Electric Vehicle Wireless Power Transfer." Energies 14, no. 9: 2590.

Journal article
Published: 02 April 2021 in Energies
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This paper describes improvements in a segmented dynamic wireless power transfer (DWPT) system for electric vehicles (EVs), and aims to offer a stable charging method for high-power applications. An integrated design is presented, including the modified switching sequence, the size of segmented transmitters, and parallel inverter technology for high-power applications. Three consecutive transmitters mounted on the rail track are energized according to the position of the pickups. This three-consecutive-transmitter group is comprised of a Q-shaped coil, a DD-shaped coil, and a Q-shaped coil again (QDDQ). QDDQ is used as an elementary energized group to optimize the number of energized transmitters and mitigate the output voltage variation. The entire DWPT system is designed with finite element analysis (FEA) and studied with circuit topologies. Overall, an experimental prototype for dynamic charging is built to verify the overall performance, which shows a great agreement with the theoretical analysis. In this prototype, there are five transmitters and one receiver. All dimensions are 500 mm × 500 mm. The proposed system has been validated to realize 500 V constant output voltage with approximately 85% dc-dc efficiency from the 100 Ω to 200 Ω load conditions. A 2.5 kW maximum output power occurs at the 100 Ω load condition.

ACS Style

Heshou Wang; Ka Cheng. An Improved and Integrated Design of Segmented Dynamic Wireless Power Transfer for Electric Vehicles. Energies 2021, 14, 1975 .

AMA Style

Heshou Wang, Ka Cheng. An Improved and Integrated Design of Segmented Dynamic Wireless Power Transfer for Electric Vehicles. Energies. 2021; 14 (7):1975.

Chicago/Turabian Style

Heshou Wang; Ka Cheng. 2021. "An Improved and Integrated Design of Segmented Dynamic Wireless Power Transfer for Electric Vehicles." Energies 14, no. 7: 1975.

Journal article
Published: 26 February 2021 in Energies
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An antilock braking system (ABS) is one of the most important components in a road vehicle, which provides active protection during braking, to prevent the wheels from locking-up and achieve handling stability and steerability. The all-electric ABS without any hydraulic components is a potential candidate for electric vehicles. To demonstrate and examine the all-electric ABS algorithms, this article proposes a single-wheel all-electric ABS test bench, which mainly includes the vehicle wheel, the roller, the flywheels, and the electromechanical brake. To simulate dynamic operation of a real vehicle’s wheel, the kinetic energy of the total rotary components in the bench is designed to match the quarter of the one of a commercial car. The vertical force to the wheel is adjustable. The tire-roller contact simulates the real tire-road contact. The roller’s circumferential velocity represents the longitudinal vehicle velocity. The design and analysis of the proposed bench are described in detail. For the developed prototype, the rated clamping force of the electromechanical brake is 11 kN, the maximum vertical force to the wheel reaches 300 kg, and the maximum roller (vehicle) velocity reaches 100 km/h. The measurable bandwidth of the wheel speed is 4 Hz–2 kHz and the motor speed is 2.5 Hz–50 kHz. The measured results including the roller (vehicle) velocity, the wheel velocity, and the wheel slip are satisfactory. This article offers the effective tools to verify all-electric ABS algorithms in a laboratory, hence saving time and cost for the subsequent test on a real road.

ACS Style

Xiangdang Xue; Ka Cheng; Wing Chan; Yat Fong; Kin Kan; Yulong Fan. Design, Analysis and Application of Single-Wheel Test Bench for All-Electric Antilock Braking System in Electric Vehicles. Energies 2021, 14, 1294 .

AMA Style

Xiangdang Xue, Ka Cheng, Wing Chan, Yat Fong, Kin Kan, Yulong Fan. Design, Analysis and Application of Single-Wheel Test Bench for All-Electric Antilock Braking System in Electric Vehicles. Energies. 2021; 14 (5):1294.

Chicago/Turabian Style

Xiangdang Xue; Ka Cheng; Wing Chan; Yat Fong; Kin Kan; Yulong Fan. 2021. "Design, Analysis and Application of Single-Wheel Test Bench for All-Electric Antilock Braking System in Electric Vehicles." Energies 14, no. 5: 1294.

Journal article
Published: 08 February 2021 in Energies
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Power converters play a crucial role in renewable energy systems. Most well-known power conversion topologies are voltage mode, not current mode. Current mode converters are more appropriate for renewable energy systems such as photovoltaic systems since solar panels are typical current sources. The vast usage of battery as energy storage is also a current sink for constant current mode charging. Utilizing current mode converters should be more straightforward and judicious. In this study, a new topology for the tapped-inductor power conversion circuit family is introduced. The proposed topology has been investigated thoroughly based on theories, simulations and experiments. The boost version is examined as an example to downstate the performance. A detailed comparison with the conventional boost current converter is conducted in this paper.

ACS Style

Chim Leung; Ka Cheng. Design, Analysis and Implementation of the Tapped-Inductor Boost Current Converter on Current Based System. Energies 2021, 14, 888 .

AMA Style

Chim Leung, Ka Cheng. Design, Analysis and Implementation of the Tapped-Inductor Boost Current Converter on Current Based System. Energies. 2021; 14 (4):888.

Chicago/Turabian Style

Chim Leung; Ka Cheng. 2021. "Design, Analysis and Implementation of the Tapped-Inductor Boost Current Converter on Current Based System." Energies 14, no. 4: 888.

Journal article
Published: 14 January 2021 in IEEE Transactions on Industrial Electronics
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This letter describes two improved 13-level inverters based on switched-capacitor. Compared with their original structure which has been published recently, one less high-voltage capacitor is required in the proposed inverters and the blocking voltage of their inverting half-bridge is reduced by half. In addition, the new inverters inherit various advantages of the original structure, such as a high boost factor of 6, self-balanced capacitor voltages and reduced voltage ripples. Circuit description, operation principle, hybrid PWM modulation and capacitor voltage ripples are analyzed. And the feasibility of the proposed inverters is finally verified by experimental results.

ACS Style

Yuanmao Ye; Guoxin Zhang; Xiaolin Wang; Yong Yi; Ka Wai Eric Cheng. Self-Balanced Switched-Capacitor Thirteen-Level Inverters with Reduced Capacitors Count. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.

AMA Style

Yuanmao Ye, Guoxin Zhang, Xiaolin Wang, Yong Yi, Ka Wai Eric Cheng. Self-Balanced Switched-Capacitor Thirteen-Level Inverters with Reduced Capacitors Count. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.

Chicago/Turabian Style

Yuanmao Ye; Guoxin Zhang; Xiaolin Wang; Yong Yi; Ka Wai Eric Cheng. 2021. "Self-Balanced Switched-Capacitor Thirteen-Level Inverters with Reduced Capacitors Count." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.

Journal article
Published: 08 January 2021 in IEEE Journal of Emerging and Selected Topics in Power Electronics
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This paper presents a step-up switched-capacitor (SC) multilevel inverter (MLI) with reduced ripple power loss by employing a soft-charging technique and modular cell. SCMLI possesses many attractive features for high-frequency ac applications. With a two-phase alternating structure, the voltage ratings of the components in the proposed SCMLI are substantially reduced compared to the unfolding H-bridge based topologies while preserving the features of voltage step-up and self-voltage balancing offered by the series-parallel SC method. This structure also enables higher operating frequency by extending the maximum charging duration of capacitors. By inserting a small resonant inductor, soft-charging is achieved in all SC units in the inverter which mitigates the ripple loss and electromagnetic interference issues existing in many SCMLIs. The soft-charging operation of the proposed inverter under staircase modulation is elucidated based on the theory of underdamped SC circuit. The mathematical analysis is validated by the simulation and experimental outcomes showing a dramatic reduction in the ripple power loss by employing the soft-charging technique. The technique is highly suitable for high frequency power distribution.

ACS Style

Yat Chi Fong; Ka Wai Eric Cheng; S. Raghu Raman. A Modular Concept Development for Resonant Soft-Charging Step-Up Switched-Capacitor Multilevel Inverter for High-frequency AC Distribution and Applications. IEEE Journal of Emerging and Selected Topics in Power Electronics 2021, PP, 1 -1.

AMA Style

Yat Chi Fong, Ka Wai Eric Cheng, S. Raghu Raman. A Modular Concept Development for Resonant Soft-Charging Step-Up Switched-Capacitor Multilevel Inverter for High-frequency AC Distribution and Applications. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2021; PP (99):1-1.

Chicago/Turabian Style

Yat Chi Fong; Ka Wai Eric Cheng; S. Raghu Raman. 2021. "A Modular Concept Development for Resonant Soft-Charging Step-Up Switched-Capacitor Multilevel Inverter for High-frequency AC Distribution and Applications." IEEE Journal of Emerging and Selected Topics in Power Electronics PP, no. 99: 1-1.

Journal article
Published: 30 December 2020 in Energies
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The rail transit system is a large electric vehicle system that is strongly dependent on the energy technologies of the power system. The use of new energy-saving amorphous alloy transformers can not only reduce the loss of rail transit power, but also help alleviate the power shortage situation and electromagnetic emissions. The application of the transformer in the field of rail transit is limited by the problem that amorphous alloy is prone to debris. this paper studied the stress conditions of amorphous alloy transformer cores under different working conditions and determined that the location where the core is prone to fragmentation, which is the key problem of smoothly integrating amorphous alloy distribution transformers on rail transit power supply systems. In this study, we investigate the changes in the electromagnetic field and stress of the amorphous alloy transformer core under different operating conditions. The finite element model of an amorphous alloy transformer is established and verified. The simulation results of the magnetic field and stress of the core under different working conditions are given. The no-load current and no-load loss are simulated and compared with the actual experimental data to verify practicability of amorphous alloy transformers. The biggest influence on the iron core is the overload state and the maximum value is higher than the core stress during short circuit. The core strain caused by the side-phase short circuit is larger than the middle-phase short circuit.

ACS Style

Jianwei Shao; Cuidong Xu; Ka Wai Eric Cheng. Core Stress Analysis of Amorphous Alloy Transformer for Rail Transit under Different Working Conditions. Energies 2020, 14, 164 .

AMA Style

Jianwei Shao, Cuidong Xu, Ka Wai Eric Cheng. Core Stress Analysis of Amorphous Alloy Transformer for Rail Transit under Different Working Conditions. Energies. 2020; 14 (1):164.

Chicago/Turabian Style

Jianwei Shao; Cuidong Xu; Ka Wai Eric Cheng. 2020. "Core Stress Analysis of Amorphous Alloy Transformer for Rail Transit under Different Working Conditions." Energies 14, no. 1: 164.

Journal article
Published: 25 December 2020 in IEEE Transactions on Vehicular Technology
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Because of the nonlinear feature of tire force, the anti-lock braking system (ABS) research based on wheel slip control (WSC) is widely used even without the measured wheel slip and road friction. Combined with the WSC technology, the four-wheel ABS with the Fuzzy sliding mode (FSM) control method is introduced in this paper. Unlike most single-wheel independent ABS, this design has more advantages when braking under the unusual road conditions, such as the transition of road conditions, the split-road conditions between the left-side wheels and the right-side wheels, even the extreme situation in which road conditions of each wheel are different, as it has the smooth-braking judgment module that is designed for wheel-to-wheel control. Besides, based on the nonlinear function of the tire-road interaction (TRI) model, the designed road condition detection module provides characteristics of the braking road that are required in the ABS operation. The model of vehicle and tire is established in Simulink through using parameters of a vehicle: BYD F0. The effectiveness of proposed four-wheel ABS is validated through the combined use of MATLAB and RT-lab and via substantial simulations and RT-LAB co-simulations.

ACS Style

Jinhong Sun; Xiangdang Xue; Ka Wai Eric Cheng. Four-Wheel Anti-Lock Braking System With Robust Adaptation Under Complex Road Conditions. IEEE Transactions on Vehicular Technology 2020, 70, 292 -302.

AMA Style

Jinhong Sun, Xiangdang Xue, Ka Wai Eric Cheng. Four-Wheel Anti-Lock Braking System With Robust Adaptation Under Complex Road Conditions. IEEE Transactions on Vehicular Technology. 2020; 70 (1):292-302.

Chicago/Turabian Style

Jinhong Sun; Xiangdang Xue; Ka Wai Eric Cheng. 2020. "Four-Wheel Anti-Lock Braking System With Robust Adaptation Under Complex Road Conditions." IEEE Transactions on Vehicular Technology 70, no. 1: 292-302.

Journal article
Published: 28 April 2020 in IEEE Transactions on Industrial Electronics
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A 13-level inverter based on switched-capacitor technique is proposed in this work. It consists of ten transistors, four diodes and four capacitors with self-balanced voltages. The ten transistors form two H-bridges and one half bridge resulting in simple structure and easy design of gate drivers. With a hybrid of level-shifted and phase-shifted PWM algorithm, voltage ripples of capacitors and low harmonic components of output voltage are suppressed simultaneously. Compared with the existing solutions, the proposed 13-level inverter has simpler structure and the lower cost per level. Experimental results demonstrate that the proposed inverter has the advantages of high boosting factor, self-balanced capacitor voltages, low harmonics and high efficiency. And the maximum efficiency is up to 97.2%.

ACS Style

Yuanmao Ye; Shikai Chen; Xiaolin Wang; Ka Wai Eric Eric Cheng. Self-Balanced 13-Level Inverter Based on Switched Capacitor and Hybrid PWM Algorithm. IEEE Transactions on Industrial Electronics 2020, 68, 4827 -4837.

AMA Style

Yuanmao Ye, Shikai Chen, Xiaolin Wang, Ka Wai Eric Eric Cheng. Self-Balanced 13-Level Inverter Based on Switched Capacitor and Hybrid PWM Algorithm. IEEE Transactions on Industrial Electronics. 2020; 68 (6):4827-4837.

Chicago/Turabian Style

Yuanmao Ye; Shikai Chen; Xiaolin Wang; Ka Wai Eric Eric Cheng. 2020. "Self-Balanced 13-Level Inverter Based on Switched Capacitor and Hybrid PWM Algorithm." IEEE Transactions on Industrial Electronics 68, no. 6: 4827-4837.

Research article
Published: 01 January 2020 in IET Power Electronics
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A new family of current-source (CS) mode switched-capacitor (SC) power converters has been proposed in this study, which imposes an alternative solution for power converters especially for CS systems. The conversion ratio of this type converter is analysed and verified here to have one increased degree of freedom using the switching mode and the capacitor-tapping mode, which is a good solution to deal with the limitation of duty cycle adjustment. This research improves the CS mode system that is relatively unexplored in previous works and the proposed work fills the research gap by the sides of the well-established voltage-source (VS) system. An interesting power conversion ratio formulation is obtained, which can produce the wide range of conversion ratio of VS mode switched-inductor power converters and CS mode SC power converters in buck, boost and buck–boost versions. In addition, this proposed CS mode SC power converters have high efficiency of power conversion through simulation and prototype experiments verification. These CS mode converters can flexibly supply power directly to the load powered by the CS and successfully replace the VS mode converters operated under the current environment system.

ACS Style

Jin Hong Sun; Ka Wai Eric Cheng. Current‐source mode switched‐capacitor power converters with improved current gain capability. IET Power Electronics 2020, 13, 116 -126.

AMA Style

Jin Hong Sun, Ka Wai Eric Cheng. Current‐source mode switched‐capacitor power converters with improved current gain capability. IET Power Electronics. 2020; 13 (1):116-126.

Chicago/Turabian Style

Jin Hong Sun; Ka Wai Eric Cheng. 2020. "Current‐source mode switched‐capacitor power converters with improved current gain capability." IET Power Electronics 13, no. 1: 116-126.

Journal article
Published: 04 November 2019 in Energies
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Light emitted diode (LED) is becoming more popular in the illumination field, and the design of LED lighting is generally made to provide illumination at lower power usage, helping save energy. A power electronic converter is needed to provide the power conversion for these LEDs to meet high efficiency, reduce components, and have low voltage ripple magnitude. The power supply for LED is revisited in this paper. The LEDs connected in series with diode, transistor, or inductor paths are examined. The formulation for each of the cases is described, including the classical converters of buck, boost, buck–boost, and Ćuk. The circuit reductions of the classic circuit, circuit without the capacitor, and without a freewheeling diode are studied. Using LED to replace freewheeling diodes is proposed for circuit component reduction. General equations for different connection paths have been developed. The efficiency and output ripple amplitude of the proposed power converters are investigated. Analytical study shows that the efficiency of proposed circuits can be high and voltage ripple magnitude of proposed circuits can be low. The results show that the proposed circuit topologies can be easily adapted to design LED lighting, which can meet the criteria of high efficiency, minimum components, and low-voltage ripple magnitude at the same time.

ACS Style

William Chen; Ka Wai Eric Cheng; Jianwei Shao. Circuit Topology Analysis for LED Lighting and its Formulation Development. Energies 2019, 12, 4203 .

AMA Style

William Chen, Ka Wai Eric Cheng, Jianwei Shao. Circuit Topology Analysis for LED Lighting and its Formulation Development. Energies. 2019; 12 (21):4203.

Chicago/Turabian Style

William Chen; Ka Wai Eric Cheng; Jianwei Shao. 2019. "Circuit Topology Analysis for LED Lighting and its Formulation Development." Energies 12, no. 21: 4203.

Journal article
Published: 13 September 2019 in IEEE Access
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In this study, a new homopolar permanent-magnet (PM) linear tubular motor is designed, analyzed and optimized. Firstly, a mechanical structure of the linear oscillating motor (LOM) is proposed and the main working principles are introduced. A basic dynamic mathematic model of the motor is given. Secondly, the magnetic circuit of the motor is analyzed and equivalent magnetic modes are obtained to estimate the magnetic characteristic and force outputs. Thirdly, optimizations including the tooth stricter of the E-core stator, the size of the PM and the air gap length are carried out to improve the force output performance of the motor, increasing force outputs and reducing force ripples during the stroke. Finally, the motor prototype is manufactured according to the design and experimental tests involving force outputs and working efficiency are measured. The average force output and efficiency of the motor can achieve 60 N and 67 %, respectively. Results obtained by finite element method (FEM) and experiments prove the correctness of the design and the effectiveness of the LOM.

ACS Style

Yu Zou; Ka Wai Eric Cheng. Design and Optimization of a Homopolar Permanent-Magnet Linear Tubular Motor Equipped With the E-Core Stator. IEEE Access 2019, 7, 134514 -134524.

AMA Style

Yu Zou, Ka Wai Eric Cheng. Design and Optimization of a Homopolar Permanent-Magnet Linear Tubular Motor Equipped With the E-Core Stator. IEEE Access. 2019; 7 (99):134514-134524.

Chicago/Turabian Style

Yu Zou; Ka Wai Eric Cheng. 2019. "Design and Optimization of a Homopolar Permanent-Magnet Linear Tubular Motor Equipped With the E-Core Stator." IEEE Access 7, no. 99: 134514-134524.

Journal article
Published: 26 August 2019 in Education Sciences
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A remote-controlled experiment for power electronics was developed for a virtual laboratory. Power converter experiments were set up, allowing students to conduct a remote-controlled experiment with special hardware and electric power. Students can activate parameter controls, connect wires, and tune electric load conditions with preset electronic laboratory instruction. Waveforms and experimental voltage and currents are measured, and the results can be delivered to users via the internet. The virtual laboratory features lecture notes and other computer simulations to improve learning. The development was used in a class of a power electronics course, in which students participated in a trial of the virtual experiment. The feedback from the students was very positive, and it was observed that students displayed better time management and improved learning and understanding of laboratory procedure as compared to a conventional laboratory class.

ACS Style

Ka Wai Eric Cheng; Chung Lun Chan. Remote Hardware Controlled Experiment Virtual Laboratory for Undergraduate Teaching in Power Electronics. Education Sciences 2019, 9, 222 .

AMA Style

Ka Wai Eric Cheng, Chung Lun Chan. Remote Hardware Controlled Experiment Virtual Laboratory for Undergraduate Teaching in Power Electronics. Education Sciences. 2019; 9 (3):222.

Chicago/Turabian Style

Ka Wai Eric Cheng; Chung Lun Chan. 2019. "Remote Hardware Controlled Experiment Virtual Laboratory for Undergraduate Teaching in Power Electronics." Education Sciences 9, no. 3: 222.

Journal article
Published: 13 August 2019 in IEEE Access
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This paper proposes a series of new control methods for single-phase Z-source inverters. A detailed description of the concept and principle of each method is first presented, then a comparison among them is conducted comprehensively. Afterwards, an optimized closed-loop control scheme with better harmonic elimination performance is derived. Experimental results obtained from a 1kW un-isolated Z-source inverter prototype have demonstrated the effectiveness of the proposed control method. Compared to the conventional boost control, the proposed scheme has better performance with reduced harmonics, more flexible voltage gain, and simple algorithm.

ACS Style

Wenzheng Xu; Ming Liu; Junwei Liu; Ka Wing Chan; Ka Wai Eric Cheng. A Series of New Control Methods for Single-Phase Z-Source Inverters and the Optimized Operation. IEEE Access 2019, 7, 113786 -113800.

AMA Style

Wenzheng Xu, Ming Liu, Junwei Liu, Ka Wing Chan, Ka Wai Eric Cheng. A Series of New Control Methods for Single-Phase Z-Source Inverters and the Optimized Operation. IEEE Access. 2019; 7 ():113786-113800.

Chicago/Turabian Style

Wenzheng Xu; Ming Liu; Junwei Liu; Ka Wing Chan; Ka Wai Eric Cheng. 2019. "A Series of New Control Methods for Single-Phase Z-Source Inverters and the Optimized Operation." IEEE Access 7, no. : 113786-113800.

Journal article
Published: 16 July 2019 in Energies
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To overcome the problem of switching loss during the balancing process, a novel cell balancing circuit is proposed with the integration of a zero current switching technique. Moreover, the balancing circuit proposed can change between a classical buck-boost pattern and a resonant switched-capacitor pattern with flexible control to cater to the balancing requirements under different driving scenarios. The results of the simulation of field experiments demonstrate successful balancing, various balancing speed, and low energy loss. The proposed balancing circuit proves to be effective for a wide range of application and is the first attempt to integrate a dual balancing function in a single balancing circuit for cells.

ACS Style

Xiaolin Wang; Ka Wai Eric Cheng; Yat Chi Fong; Wang; Fong. Zero Current Switching Switched-Capacitors Balancing Circuit for Energy Storage Cell Equalization and Its Associated Hybrid Circuit with Classical Buck-Boost. Energies 2019, 12, 2726 .

AMA Style

Xiaolin Wang, Ka Wai Eric Cheng, Yat Chi Fong, Wang, Fong. Zero Current Switching Switched-Capacitors Balancing Circuit for Energy Storage Cell Equalization and Its Associated Hybrid Circuit with Classical Buck-Boost. Energies. 2019; 12 (14):2726.

Chicago/Turabian Style

Xiaolin Wang; Ka Wai Eric Cheng; Yat Chi Fong; Wang; Fong. 2019. "Zero Current Switching Switched-Capacitors Balancing Circuit for Energy Storage Cell Equalization and Its Associated Hybrid Circuit with Classical Buck-Boost." Energies 12, no. 14: 2726.

Journal article
Published: 28 June 2019 in Energies
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With the development of in-wheel technology (IWT), the design of the electric vehicles (EV) is getting much improved. The anti-lock braking system (ABS), which is a safety benchmark for automotive braking, is particularly important. Installing the braking motor at each fixed position of the wheel improves the intelligent control of each wheel. The nonlinear ABS with robustness performance is highly needed during the vehicle’s braking. The anti-lock braking controller (CAB) designed in this paper considered the well-known adhesion force, the resistance force from air and the wheel rolling friction force, which bring the vehicle model closer to the real situation. A sliding mode wheel slip ratio controller (SMWSC) is proposed to yield anti-lock control of wheels with an adaptive sliding surface. The vehicle dynamics model is established and simulated with consideration of different initial braking velocities, different vehicle masses and different road conditions. By comparing the braking effects with various CAB parameters, including stop distance, braking torque and wheel slip ratio, the SMWSC proposed in this paper has superior fast convergence and stability characteristics. Moreover, this SMWSC also has an added road-detection module, which makes the proposed braking controller more intelligent. In addition, the important brain of this proposed ABS controller is the control algorithm, which can be used in all vehicles’ ABS controller design.

ACS Style

Jinhong Sun; Xiangdang Xue; Ka Wai Eric Cheng. Fuzzy Sliding Mode Wheel Slip Ratio Control for Smart Vehicle Anti-Lock Braking System. Energies 2019, 12, 2501 .

AMA Style

Jinhong Sun, Xiangdang Xue, Ka Wai Eric Cheng. Fuzzy Sliding Mode Wheel Slip Ratio Control for Smart Vehicle Anti-Lock Braking System. Energies. 2019; 12 (13):2501.

Chicago/Turabian Style

Jinhong Sun; Xiangdang Xue; Ka Wai Eric Cheng. 2019. "Fuzzy Sliding Mode Wheel Slip Ratio Control for Smart Vehicle Anti-Lock Braking System." Energies 12, no. 13: 2501.

Journal article
Published: 12 June 2019 in IET Power Electronics
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A wireless power transfer concept is applied to cordless ironing system by implementing induction heating techniques to enhance the mobility of traditional electric irons due to the restriction of the cable connection. The induction coils are particularly designed and the inductances of the coils in free space are also calculated and compared with measured values. The finite element method (FEM) analysis is adopted to study the inductance characteristics of the coils under the practical wireless power transfer challenge when the iron is placed above the coils at different locations on the ironing board. The comprehensive study also includes the associated driving circuit for the induction coils. The magnetic field and eddy currents distribution on the iron are then investigated based on FEM analysis under three situations, which facilitates the associated analysis of temperature rising processes on the iron. A prototype for the proposed induction iron system is developed and comprehensive experiments, including heating performance examination tests, electromagnetic interference tests as well as practical ironing work, are undertaken. The experimental results amply prove the theoretical analysis and confirm the validity and feasibility of the proposed induction iron system.

ACS Style

Lichan Meng; Ka Wai Eric Cheng. Wireless power transfer technology for electric iron based on multi‐coils induction heating design. IET Power Electronics 2019, 12, 2566 -2577.

AMA Style

Lichan Meng, Ka Wai Eric Cheng. Wireless power transfer technology for electric iron based on multi‐coils induction heating design. IET Power Electronics. 2019; 12 (10):2566-2577.

Chicago/Turabian Style

Lichan Meng; Ka Wai Eric Cheng. 2019. "Wireless power transfer technology for electric iron based on multi‐coils induction heating design." IET Power Electronics 12, no. 10: 2566-2577.

Journal article
Published: 23 May 2019 in Energies
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In this study, a new permanent magnet rotary-linear (RotLin) motor is proposed for foldable photovoltaic units. Firstly, the mechanical structure, operation principles and magnetic circuits of the motor are introduced, and a design procedure elaborated the parameters calculation in the linear part and the rotary part. Finite element method (FEM) is used to analyze the magnetic field of the motor, and linear force outputs and torque outputs are obtained. Secondly, a control scheme is designed for the prototype of the motor including the position control and the speed control. The deformation on the mover and the magnetic coupling effect between the linear part and the rotational part are discussed. Finally, experimental results show that this motor can simultaneously realize a linear movement with continuous rotation. The linear poisoning accuracy can achieve 0.4 µm and the angular speed can be controlled with steady errors less than 3 rpm, proving the effectiveness of the proposed RotLin motor.

ACS Style

Yu Zou; Ka Wai Eric Cheng. Design and Control of a Permanent Magnet RotLin Motor for New Foldable Photovoltaic Units. Energies 2019, 12, 1983 .

AMA Style

Yu Zou, Ka Wai Eric Cheng. Design and Control of a Permanent Magnet RotLin Motor for New Foldable Photovoltaic Units. Energies. 2019; 12 (10):1983.

Chicago/Turabian Style

Yu Zou; Ka Wai Eric Cheng. 2019. "Design and Control of a Permanent Magnet RotLin Motor for New Foldable Photovoltaic Units." Energies 12, no. 10: 1983.

Journal article
Published: 28 March 2019 in Energies
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The pantograph arcing phenomenon may shorten the service life of a pantograph and even destroy onboard devices and instruments, due to the irregular motions of the train and the intermittent line–pantograph disconnection. This paper points out that abrupt inductive energy from the magnetizing inductance of the traction transformer can lead to an electromagnetic transient process with unexpected overvoltage across it. Further, a supercapacitor-based power electronic system is proposed, which can not only redirect the inductive energy to the supercapacitor pack through bidirectional converters but also mitigate the overvoltage across the main electrical equipment when pantograph arcing occurs. Simulation results show the overvoltage could be reduced and the energy stored in the supercapacitor which could also be used to provide energy for sensors or other devices.

ACS Style

Cuidong Xu; Zhu Chen; Ka Wai Eric Cheng; Xiaolin Wang; Ho Fai Ho. A Supercapacitor-Based Method to Mitigate Overvoltage and Recycle the Energy of Pantograph Arcing in the High Speed Railway. Energies 2019, 12, 1214 .

AMA Style

Cuidong Xu, Zhu Chen, Ka Wai Eric Cheng, Xiaolin Wang, Ho Fai Ho. A Supercapacitor-Based Method to Mitigate Overvoltage and Recycle the Energy of Pantograph Arcing in the High Speed Railway. Energies. 2019; 12 (7):1214.

Chicago/Turabian Style

Cuidong Xu; Zhu Chen; Ka Wai Eric Cheng; Xiaolin Wang; Ho Fai Ho. 2019. "A Supercapacitor-Based Method to Mitigate Overvoltage and Recycle the Energy of Pantograph Arcing in the High Speed Railway." Energies 12, no. 7: 1214.