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Che-Yu Lu

Bio: Che-Yu Lu is an academic researcher from National Chiao Tung University. The author has contributed to research in topics: Control theory & Inductor. The author has an hindex of 5, co-authored 12 publications receiving 79 citations.

Papers
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Journal ArticleDOI
TL;DR: The decoupled master-slave current balancing control is proposed, and its small-signal transfer functions show that the voltage regulation loop and the current balancing loop are decoupling.
Abstract: For three-phase interleaved boost converters (IBC), the master-slave current balancing control is often used to cooperate with the voltage regulation control, but the tuning of the current balancing controller would have effect on the voltage regulation loop. In this letter, the decoupled master-slave current balancing control is proposed, and its small-signal transfer functions show that the voltage regulation loop and the current balancing loop are decoupled. A 300 W prototype of IBC is implemented to demonstrate the proposed control method.

53 citations

Journal ArticleDOI
TL;DR: The average-behavior circuit model for the three-level FCBC is studied, and the relationship of control to output signals is presented to analyze the coupling effects between the capacitor voltage balancing and the output voltage regulation.
Abstract: This paper proposes an active voltage balancing control strategy for the three-level flying capacitor boost converter (FCBC). The average-behavior circuit model for the three-level FCBC is studied, and then, the relationship of control to output signals is presented to analyze the coupling effects between the capacitor voltage balancing and the output voltage regulation. In addition, classical proportional and proportional-integral controllers are used for the voltage balancing control loop and the output voltage regulating control loop, respectively. Finally, the proposed control algorithm is implemented in a commercial field programmable gate array platform. Some simulation and experimental results demonstrate that the proposed active control strategy is able to achieve the desired effects for the steady-state and transient responses.

32 citations

Journal ArticleDOI
TL;DR: The results show that the voltage-regulation loop and the proposed current-balancing loop are nominally decoupled, and two PI-type controllers can be designed independently and included to implement the proposed DCBC.
Abstract: For interleaved boost-type converters, both functions of voltage regulation and current balance are important. In this paper, the decoupled current-balancing control (DCBC) with two parallel loops is proposed. At first, the small-signal transfer functions of the voltage-regulation loop and the current balancing loop to the controller output are derived. The results show that the voltage-regulation loop and the proposed current-balancing loop are nominally decoupled. That is, two PI-type controllers can be designed independently and included to implement the proposed DCBC. Additionally, the single-sensor sampling-current strategy is proposed to obtain two average inductor currents by sensing only the sum of diode currents. All the controllers are implemented in field-programmable gate array (FPGA). The provided simulation and experimental results demonstrate the proposed DCBC.

30 citations

Proceedings ArticleDOI
04 Mar 2018
TL;DR: The average-behavior circuit model of three-level flying capacitor boost converter (FCBC) is presented and the closed-loop transfer functions can be obtained and the controller parameters can be selected.
Abstract: The average-behavior circuit model of three-level flying capacitor boost converter (FCBC) is presented in this paper. The small-signal transfer functions of three-level FCBC are first obtained that are including two control signals as the input signals and including the output voltage and the capacitor voltage as the output signals. Besides, the voltage regulating controller is a proportional-integral (PI-type) controller and the voltage balancing controller is a proportional (P-type) controller. Based on the small-signal analysis of three-level FCBC, the closed-loop transfer functions can be obtained and the controller parameters can be selected as well. All the algorithms are implemented in a Field Programmable Gate Array (FPGA) chip. The simulation and experimental results validate the capacitor voltage balancing capability of the proposed method.

19 citations

Journal ArticleDOI
TL;DR: The voltage drop of the power semiconductor is first considered in the proposed three-phase current sensorless control method and the voltage-loop transfer function of PFC bridge converter controlled by the proposed method is modeled, and the result is helpful to obtain the controller parameter.
Abstract: Three-phase bridge converter is popular in ac–dc power conversion. The conventional sensor control with inner current loop and outer voltage loop is often used to control the three-phase bridge converter. Many three-phase sensorless control methods had been proposed to control the bridge converter with considering the inductance and inductor resistance. In this paper, the voltage drop of the power semiconductor is first considered in the proposed three-phase current sensorless control method. At first, the dynamic behaviors of three-phase bridge converter for power factor correction (PFC) applications are studied, and its equivalent three-switch model is developed. Based on this developed model, three-phase current sensorless control with only voltage controller is proposed. Additionally, the voltage-loop transfer function of PFC bridge converter controlled by the proposed method is modeled, and the result is helpful to obtain the controller parameter. The proposed control method is implemented on the DSP-based platform for evaluation. Finally, the provided simulation and experimental results demonstrate the performance of the proposed method.

11 citations


Cited by
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Journal ArticleDOI
TL;DR: An innovative single-phase integrated charger, using the PEV propulsion machine and its traction converter, is introduced, capable of power factor correction and battery voltage/current regulation without any bulky add-on components.
Abstract: Plug-in electric vehicles (PEVs) are equipped with onboard level-1 or level-2 chargers for home overnight or office daytime charging. In addition, off-board chargers can provide fast charging for traveling long distances. However, off-board high-power chargers are bulky, expensive, and require comprehensive evolution of charging infrastructures. An integrated onboard charger capable of fast charging of PEVs will combine the benefits of both the conventional onboard and off-board chargers, without additional weight, volume, and cost. In this paper, an innovative single-phase integrated charger, using the PEV propulsion machine and its traction converter, is introduced. The charger topology is capable of power factor correction and battery voltage/current regulation without any bulky add-on components. Ac machine windings are utilized as mutually coupled inductors, to construct a two-channel interleaved boost converter. The circuit analyses of the proposed technology, based on a permanent magnet synchronous machine (PMSM), are discussed in details. Experimental results of a 3-kW proof-of-concept prototype are carried out using a ${\textrm{220-V}}_{{\rm{rms}}}$ , 3-phase, 8-pole PMSM. A nearly unity power factor and 3.96% total harmonic distortion of input ac current are acquired with a maximum efficiency of 93.1%.

106 citations

Journal ArticleDOI
TL;DR: The design and development of a novel interleaved tri-state boost converter (ITBC), which produces lower ripple and exhibits better dynamic response, is discussed and is observed that ITBC is performed better than other two converters.
Abstract: In this paper, the design and development of a novel interleaved tri-state boost converter (ITBC), which produces lower ripple and exhibits better dynamic response, is discussed. Boost converters are frequently connected in parallel and operate in an interleaving mode for the reduction of ripple content in source current and in output voltage. In this way, interleaved boost converter (IBC) is conceived, which improves the power handling capabilities and increases the overall system rating. It also has the advantage of reduction of the ripple content in source current and output voltage, but when control-to-output transfer function of IBC is derived under continuous conduction mode of operation, then a right-half-plane (RHP) zero appears in the transfer function. Due to the presence of RHP zero, IBC has nonminimum phase problem, which deteriorates the dynamic performance. The tri-state boost converter (TBC) is the best choice for RHP zero elimination, but due to the extra freewheeling mode, ripple content will also be increased. The proposed converter is a parallel combination of two TBC and operates in an interleaving mode. Therefore, the proposed converter has both of the advantages of TBC and IBC. The performance analyses of ITBC, TBC, and IBC have been studied based on simulation and experimental results. From the comparative analysis, it is observed that ITBC is performed better than other two converters. The ripple comparisons between three converters have also been done. It is found that the ripple content in ITBC is slightly greater than IBC but is less than TBC.

54 citations

Journal ArticleDOI
TL;DR: A safe charging operation for the integrated on-board electric vehicle (EV) charging system, where the power electronic components are reconfigured from the propulsive system, based on the analysis of the charging torque and the ripple currents is presented.
Abstract: This paper presents a safe charging operation for the integrated on-board electric vehicle (EV) charging system, where the power electronic components are reconfigured from the propulsive system. First, the rotational movement is detected and analyzed, when the motor windings are reutilized as the dc–dc inductors. Then the safe charging operation is investigated, which is based on the analysis of the charging torque and the ripple currents. Moreover, a new control strategy is presented with the purpose of the safe operation and smoothing reactor during the EV charging process. Finally, both simulation and experimentation are carried out to verify the safe charging operation. The results prove the feasibility and validity of the proposed safe charging operation for on-board charger with the three-phase interior permanent-magnet motor.

49 citations

Journal ArticleDOI
TL;DR: The average-behavior circuit model for the three-level FCBC is studied, and the relationship of control to output signals is presented to analyze the coupling effects between the capacitor voltage balancing and the output voltage regulation.
Abstract: This paper proposes an active voltage balancing control strategy for the three-level flying capacitor boost converter (FCBC). The average-behavior circuit model for the three-level FCBC is studied, and then, the relationship of control to output signals is presented to analyze the coupling effects between the capacitor voltage balancing and the output voltage regulation. In addition, classical proportional and proportional-integral controllers are used for the voltage balancing control loop and the output voltage regulating control loop, respectively. Finally, the proposed control algorithm is implemented in a commercial field programmable gate array platform. Some simulation and experimental results demonstrate that the proposed active control strategy is able to achieve the desired effects for the steady-state and transient responses.

32 citations

Journal ArticleDOI
TL;DR: In this paper, an integrated magnetic current balancing transformer (ICBT) based IPOP LLC resonant converter modules ensures both the input current sharing and output current sharing between constituent LLC modules, under the open-loop condition quite effectively.
Abstract: The input-parallel output-parallel (IPOP) connected converter system allows the use of a low-power converter module for high-power applications. However, mismatches in the IPOP circuit parameters cause uneven current sharing between the constituent modules, which makes the IPOP system unreliable for practical use. Different techniques have been proposed so far; however, they cause an increase in magnetic volume, cost, component count, and complexity of the IPOP system. In this article, a reliable and efficient magnetic integration technique is proposed for the current sharing requirements of the IPOP system based on LLC resonant converter modules. The proposed integrated magnetic current balancing transformer (ICBT) based IPOP LLC resonant converter modules ensures both the input current sharing and output current sharing between constituent LLC modules, under the open-loop condition quite effectively. The proposed ICBT is the resonant inductors of LLC resonant converter modules, coupled to perform the function of current balancing as well as generates enough leakage inductances for resonance operation, simultaneously. Thus, it can reduce the overall magnetic volume and improves power density of the IPOP LLC modules. Moreover, the current sharing performances of the proposed ICBT in both the steady-state and dynamic-state are analyzed based on the magnetic and electrical model. To validate the performance of the proposed ICBT based IPOP two LLC modules, a 2.6-kW hardware prototype was designed, fabricated, and tested successfully.

24 citations