13 results on '"Chen, Zhangyong"'
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2. Design considerations of asymmetric step-up/down dual-resonator charger for lithium-ion battery applications
- Author
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Han, Yubo, Wu, Yunfeng, Chen, Zhangyong, Tang, Yuanhong, Liu, Xiangyu, Qian, Xinjun, and Zhang, Changhua
- Published
- 2022
- Full Text
- View/download PDF
3. A Simplified Method for Extracting Parasitic Inductances of MOSFET-Based Half-Bridge Circuit
- Author
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Bi Chuang, Jun Zhai, Chen Zhangyong, Zhong Rongqiang, Anjian Zhou, Yong Chen, and Zhong Yang
- Subjects
General Computer Science ,Computer science ,S-parameter ,02 engineering and technology ,Hardware_PERFORMANCEANDRELIABILITY ,Parameter extraction ,01 natural sciences ,multi-terminal circuit ,0103 physical sciences ,MOSFET ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Hardware_INTEGRATEDCIRCUITS ,General Materials Science ,Electrical impedance ,Electronic circuit ,010302 applied physics ,Focused Impedance Measurement ,020208 electrical & electronic engineering ,General Engineering ,electromagnetic interference ,Power (physics) ,Terminal (electronics) ,RLC circuit ,Equivalent circuit ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,lcsh:TK1-9971 ,Network analysis - Abstract
To better predict the high-frequency switching operation of the half-bridge circuit in power converters, the value of the parasitic elements of these devices must be accurately evaluated. A new MOSFET-based half-bridge circuit parasitic inductances extraction method using two-port S-parameters is proposed in this paper. By changing the terminal connection of the half-bridge circuit, we can treat it as several different two-port networks, and then detailed network analysis can be performed on it. The parasitic parameters of multi-terminal actual circuits such as half-bridge can be extracted accurately and quickly through the simple measurement steps and calculations of the proposed method.
- Published
- 2021
4. A Low Voltage Stress PFC Rectifier Based on Nonoverlapping Strategy Using Resonant Switched-Capacitor Converter.
- Author
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Chen, Zhangyong, Han, Yubo, Wu, Yunfeng, Lu, Zhengdong, and Liu, Xiangyu
- Subjects
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CAPACITOR switching , *ELECTRIC current rectifiers , *STRAINS & stresses (Mechanics) , *LOW voltage systems , *SECOND harmonic generation , *ZERO current switching , *VOLTAGE - Abstract
In order to break limited step-down ratio range and poor regulation capacity in the conventional resonant switched-capacitor converters for rectifier application, a single-stage ac/dc rectifier based on the dual-resonance switched-capacitor converter is proposed in this article. Through utilizing a dual-resonant structure and nonoverlapping strategy to realize wide continuous voltage gain of the proposed converter, high power factor (PF) and low total harmonic distortion (THD) based on the narrow dead zone are guaranteed by operating at high step-down conversion ratio in this converter topology. Moreover, the voltage gain is concentrated between resonant frequency and double resonant frequency to achieve a narrow switching frequency range for rectifier application. Furthermore, operating at flat voltage stress curves to obtain low voltage stress character. Comprehensive mode analysis, input PF and THD, and stress analysis are given, and analysis results indicate that the proposed power factor correction converter can work with soft turn on and zero-current turn off; high efficiency is realized. Finally, an experimental prototype with 85–130 Vac input and 47 Vdc/44 W output is built and tested for verifying the operation modes and PFC performance, and the comparison between different rectifiers and the proposed one is provided. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
5. Asymmetric Phase-Shift Modulation Strategy of DAB Converters for Improved Light-Load Efficiency.
- Author
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Chen, Gen, Chen, Zhangyong, Chen, Yong, Feng, Chenchen, and Zhu, Xintong
- Subjects
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DEGREES of freedom , *ZERO voltage switching - Abstract
Dual active converter (DAB) can achieve high efficiency when the voltage ratio (the ratio of the input voltage to the output voltage equivalent to the primary side) is one, but when the voltage ratio is not one, the light-load efficiency drops sharply. Based on the realization logic of DAB light-load, this article proposes a modulation method with asymmetric compression duty cycle, which only increases one degree of freedom and does not need additional components to significantly improve the light-load efficiency. First, this article introduces the existing problems and solutions of the traditional scheme and puts forward a new modulation strategy. Then, the operating modes and power characteristics are analyzed. Then, the influence of duty cycle compression on reflux power and current stress is analyzed. Finally, a prototype with an input voltage of 100–200V, an output voltage of 50 V, and a full load power of 300–600 W is built to verify the analysis. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
6. Reinforcement Learning Based Efficiency Optimization Scheme for the DAB DC–DC Converter With Triple-Phase-Shift Modulation.
- Author
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Tang, Yuanhong, Hu, Weihao, Xiao, Jian, Chen, Zhangyong, Huang, Qi, Chen, Zhe, and Blaabjerg, Frede
- Subjects
REINFORCEMENT learning ,MAGNETIC flux leakage ,DC-to-DC converters ,PHASE modulation ,CAPACITOR switching ,HEURISTIC algorithms - Abstract
Aim to improve the power efficiency of the dual-active-bridge (DAB) dc–dc converter, an efficiency optimization scheme with triple-phase-shift (TPS) modulation using reinforcement learning (RL) is proposed in this article. More specifically, the Q-learning algorithm, as a typical algorithm of the RL, is applied to train an agent offline to obtain an optimized modulation strategy, and then the trained agent provides control decisions online in a real-time manner for the DAB dc–dc converter according to the current operating environment. The main objective is to obtain the optimal phase-shift angles for the DAB dc–dc converter, which can achieve the maximum power efficiency by reducing the power losses. Moreover, all possible operation modes of the TPS modulation are considered during the offline training process of the Q-learning algorithm. Thus, the cumbersome process for selecting the optimal operation mode in the conventional schemes can be circumvented successfully. Based on these merits, the proposed efficiency optimization scheme using the RL can realize the excellent performances for the whole load conditions and voltage conversion ratios. Finally, a 1.2-KW prototyped is built, and the simulation and the experimental results demonstrate that the power efficiency can be improved by using the optimization scheme based on the RL. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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- View/download PDF
7. The Current Sharing Strategy of Three-Phase Series Capacitor Boost Converter Based on Charge-Balance Method.
- Author
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Zhao, Lingling, Wu, Yunfeng, Chen, Zhangyong, Shen, Lanxiao, and Zhang, Changhua
- Subjects
CAPACITORS ,POWER electronics - Abstract
This article proposed a current sharing strategy for three-phase series capacitor boost converter for continuous conduction mode operation. The phase current can be automatically balanced based on the charge-balance principle, without any additional sensors or devices. And a uniform output voltage expression in full duty ratio range can be obtained. The mechanism of unbalanced current is disclosed. A current sharing strategy is proposed by adjusting the duty ratio in adjacent phase. The selection of capacitor and inductor is discussed via the analysis of topological operation and current deviation. The related characteristics are presented, including uniform output expression, continuous duty ratio operation, insensitivity to inductor parameters, loos analysis, and device stress. Experimental results on 100-W prototype are provided to confirm the feasibility of the proposed strategy. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
8. Adaptive Fast Fault Location for Open-Switch Faults of Voltage Source Inverter.
- Author
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Yin, Haoran, Chen, Yong, Chen, Zhangyong, and Li, Meng
- Subjects
FAULT location (Engineering) ,IDEAL sources (Electric circuits) ,ELECTRIC fault location ,SAMPLING errors ,THRESHOLD voltage ,DYNAMIC models - Abstract
In this paper, the issue of open-switch faults of voltage source inverter (VSI) is studied, an adaptive fast voltage-based real-time open-switch fault location method is proposed. Firstly, for each switching period, the voltage deviation is calculated by the expected voltage and estimated actual voltage, they are obtained via the mixed logical dynamic model (MLDM) and measured currents, respectively. Then, the voltage deviation of each phase is employed as a fault variable. By this way, avoiding the use of additional hardware, and embedding easily in system. Furthermore, considering the impact of sampling error, parameter error, dead time, delay time, and transition time, the adaptive threshold is designed. Finally, simulations and experiments are executed to verify the effectiveness of the proposed method. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
9. Dual‐active‐bridge DC–DC converter with auxiliary parallel networks for wide load range ZVZCS application.
- Author
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Tang, Yuanhong, Hu, Weihao, Chen, Zhangyong, Huang, Qi, and Blaabjerg, Frede
- Abstract
In this study, a wide load range zero‐voltage zero‐current switching (ZVZCS) dual‐active‐bridge DC–DC converter using auxiliary parallel networks is proposed. The outstanding feature of the proposed converter is that all of the switches are allowed to operate with zero‐voltage switching while four of the switches are allowed to operate with zero‐current switching, due to the use of two auxiliary parallel networks, which were paralleled to two active bridges, respectively. Furthermore, the circulating current losses can be reduced significantly by using unified boundary trapezoidal modulation method. Based on these merits, the proposed converter has some advantages for the wide range load variation applications with less circulating current losses. The operation principles, soft‐switching conditions and loss analyses comparison are given in this study. These benefits and characteristics mentioned above are verified from the experimental results by using a 1 kW prototype. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
10. Series-Capacitor-Based Buck PFC Converter With High Power Factor and Ultrahigh Step-Down Conversion Ratio.
- Author
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Chen, Zhangyong, Chen, Yong, Zhang, Chenyu, Wu, Yunfeng, and Zhang, Changhua
- Subjects
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CAPACITORS , *CONVERTERS (Electronics) , *POWER factor measurement , *ELECTRIC capacity , *ELECTRIC potential - Abstract
In this paper, a series-capacitor-based interleaving buck power factor correction (PFC) converter is proposed, the intermediate energy storage capacitance of which is operated at discontinuous capacitor voltage mode (DCVM), and automatic power factor (PF) correction for this converter is obtained. Moreover, the voltage across the series capacitor of the proposed PFC converter is clamped at the input voltage, and thus peak voltage stress existed in the traditional DCVM buck PFC could be relieved. By effectively regulating the charge/discharge time for the series capacitor, ultrahigh step-down conversion ratio of the proposed converter is achieved, the conversion ratio of which is independent of the duty cycle and only related to the switching frequency and circuit parameters. Therefore, high PF can be obtained due to very narrow deadtime of the input current. Meanwhile, the proposed PFC converter can realize the soft turn-on of part power switch and soft turn-off of part power diodes. In addition, comparing with the traditional discontinuous inductor current mode PFC, the input current of the proposed PFC converter is continuous so that the peak value and root-mean-square value of input current can be reduced. The operational principle, performance analysis, and parameter design principle are given in this paper. The analysis results show that the PF and total harmonic distortion are also independent of the duty cycle. Finally, a 220-Vac input, 60 W/15 V output experimental prototype is built to verify the validity of the theoretical analysis. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
11. Variable Duty Cycle Control for Quadratic Boost PFC Converter.
- Author
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Chen, Zhengge, Yang, Ping, Zhou, Guohua, Xu, Jianping, and Chen, Zhangyong
- Subjects
POWER factor measurement ,ELECTRIC potential ,AC DC transformers ,POWER resources ,ELECTRIC circuits - Abstract
Compared with constant duty cycle-controlled discontinuous conduction mode (DCM) boost power factor (PF) correction (PFC) converter, constant duty cycle-controlled quadratic DCM–DCM boost PFC converter features with much lower second-order line frequency output voltage ripple, and however, it suffers from low PF. To increase PF of quadratic DCM–DCM boost PFC converter, a variable duty cycle control technique for quadratic DCM–DCM boost PFC converter is presented in this paper. An approximation equivalent for the variable duty cycle is employed to simplify the implementation circuit. The corresponding expressions of PF and output voltage ripple are analyzed. For input voltage range of 100–240 Vac, quadratic DCM–DCM boost PFC converter with variable duty cycle control benefits with very high PF, and tradeoff between PF and output voltage ripple of this converter is analyzed. Experimental results from 100-W prototypes are given to verify the theoretical analysis. [ABSTRACT FROM PUBLISHER]
- Published
- 2016
- Full Text
- View/download PDF
12. Single-Inductor Dual-Output Buck–Boost Power Factor Correction Converter.
- Author
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Liu, Xueshan, Xu, Jianping, Chen, Zhangyong, and Wang, Nan
- Subjects
ELECTRIC power factor correction ,CONVERTERS (Electronics) ,ELECTRIC inductors ,ELECTRIC power conversion ,POWER transmission - Abstract
A single-inductor dual-output (SIDO) buck–boost power factor correction (PFC) converter operating in critical conduction mode is proposed in this paper. By multiplexing a single inductor, each output of the SIDO buck–boost converter can be regulated independently. Compared with a conventional two-stage multiple-output converter, the SIDO buck–boost PFC converter benefits from significant overall cost saving, small size, and light weight. Moreover, the efficiency of the SIDO buck–boost PFC converter can be improved due to single-stage power conversion. The control strategy and characteristics of the proposed converter are analyzed. The efficiency, power factor, total harmonic distortion, and output accuracy are verified using the experimental results. [ABSTRACT FROM PUBLISHER]
- Published
- 2015
- Full Text
- View/download PDF
13. High‐efficiency high step‐up PWM resonant converter.
- Author
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Cai, Yaping, Xu, Jianping, Chen, Zhangyong, and Zhou, Xiang
- Abstract
A novel high‐efficiency high step‐up pulse‐width modulation (PWM) resonant converter is proposed. It achieves high‐voltage step‐up by connecting the outputs of the boost converter cell and the isolated single‐ended PWM resonant converter cell in series, and high efficiency by zero current switching for the diode on the secondary side of the transformer of the single‐ended PWM resonant converter cell. The boost converter cell in the proposed converter can not only step‐up voltage, but also absorbs the leakage inductor energy during the turn‐off interval of the power switch to improve power conversion efficiency. Experimental results of a 100 W 35 V/200 V prototype are presented to verify the analysis results of the proposed converter. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
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