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Start Over Author "Xu, Jianping" Journal ieee transactions on industrial electronics
48 results on '"Xu, Jianping"'

4. Variable Turn Ratio Current-Source Charge Pump Power Factor Correction Converter With High Power Factor and Wide Input Voltage Range

Author

Yang, Ping, Peng, Yusheng, Sun, Yijie, Liu, Hongchen, and Xu, Jianping

Abstract

Power factor correction (PFC) is widely used in ac–dc converters to improve power quality. The current-source charge pump (CS-CP) PFC converter has the advantages of simple structure, easy control, and low cost, but it can only obtain a high power factor (PF) over a narrow input range. The operation principle of the CS-CP PFC converter and the input voltage range are analyzed in this article. In order to obtain a high PF over a wide input voltage range, in this article, a variable turn ratio CS-CP PFC converter is proposed. By adjusting the turn ratio according to the variation of the input voltage, the proposed converter can obtain a high PF over a wide input voltage range, reduce the voltage stress of the bus capacitor, and solve the problem of insufficient voltage gain at low input voltage. The operating modes and the wide input voltage range of the proposed converter are analyzed, and the relevant parameters are given. A 40-W experimental prototype operating with the input voltage range of 100–242 Vac is built to verify the theoretical analysis. The proposed converter obtains the PF of 0.946–0.991 and its total harmonic distortion of current can satisfy the IEC 61000-3-2-2020 Class-C Standard in the whole input voltage.

Published
2024
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5. A Novel Single-Stage AC/DC Converter Integrated Interleaved DCM Boost PFC and LLC DC–DC With Reduced Bus Voltage

Author

Lu, Song, Ma, Hongbo, Yi, Junhong, Chen, Zhe, Li, Xiaobin, Xu, Jianping, and Feng, Quanyuan

Abstract

Due to the applied pulse frequency modulation control and switch integration, single-stage boost-LLC ac/dc converters suffer from high bus voltage, which makes them difficult to operate for high voltage input. To solve this issue, a novel single-stage ac/dc converter by incorporating the interleaved discontinuous conduction mode (DCM) boost cell and an LLC cell is proposed. Different from the existing topology, in the proposed converter, two capacitors employed for splitting the ac input voltage into two parts are placed before the rectifier bridge. Thus, the voltage across each power factor correction (PFC) cell is halved and the bus voltage can be significantly reduced. Furthermore, two high-frequency diodes and one filter capacitor are omitted, which helps improve the zero-crossing distortion of the input current. More importantly, the circuit efficiency is thus increased. Hence, low bus voltage, low component count, and high efficiency are the main advantages of the proposed converter. Simulations and experimental results are presented to prove the aforementioned features of the proposed converter.

Published
2024
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6. A Multi-Frequency PCCM ZVS Modulation Scheme for Optimizing Overall Efficiency of Four-Switch Buck–Boost Converter With Wide Input and Output Voltage Ranges

Author

Liu, Feiming, Xu, Jianping, Chen, Zhengge, Yang, Ping, Deng, Kai, and Chen, Xin

Abstract

The pseudo-continuous conduction mode (PCCM) zero-voltage-switching (ZVS) modulation scheme is widely used in the four-switch buck–boost (FSBB) converter to achieve high efficiency and voltage step-up/step-down without modulation mode transition. There are two degrees of modulation freedom in the PCCM ZVS modulation scheme. The previous schemes typically only optimize one of them to reduce root mean square (rms) inductor current, which results in relatively lower efficiency in the condition when the difference between input voltage and output voltage is large. In this article, a multi-frequency PCCM ZVS modulation scheme is proposed for the FSBB converter with wide input and output voltage ranges. By optimizing both of the two degrees of modulation freedom to reduce rms inductor current, the heavy-load efficiency can be effectively improved when the difference between input voltage and output voltage is large. Thus, the overall efficiency of the FSBB converter can be optimized. A 1500-W FSBB prototype with input and output voltage ranges of 200–400V is built to verify the proposed modulation scheme.

Published
2023
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19. Embedded Bidirectional Buck–Boost Converter in Half Bridge Class-D Audio Amplifier for Suppressing Bus Voltage Pumping.

Author

Huang, Rui, Xu, Duo, Liu, Feiming, Sha, Jin, and Xu, Jianping

Subjects
AUDIO amplifiers, CERAMIC capacitors, VOLTAGE, BUS transportation, POWER capacitors, ZERO voltage switching, CATALYTIC converters for automobiles
Abstract

In this article, a half-bridge class-D audio amplifier (HB-CDAA) system with embedded bidirectional buck–boost converter is proposed. The proposed HB-CDAA system consists of a front-end symmetric bipolar output converter, a bidirectional buck–boost converter, and an HB-CDAA. With the help of the embedded bidirectional buck–boost converter, bus voltage pumping on the output of the front-end symmetric bipolar output converter of HB-CDAA can be suppressed. Thus, small ceramic capacitors can be used as bus capacitors to increase power density and to improve audio output quality. Furthermore, ZVS of the embedded bidirectional buck–boost converter can be achieved. The operating principle of the proposed circuit is analyzed and an experimental prototype is built. Experimental results show that ZVS of the embedded bidirectional buck–boost converter is achieved, and bus voltage pumping is successfully suppressed with small bus capacitors. [ABSTRACT FROM AUTHOR]

Published
2022
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31. Time-domain analysis of half-wave zero-current switch quasi-resonant converters by using SPICE

Author

Xu, Jianping and Grotzbach, Manfred

Subjects
Time-domain analysis -- Usage, Electric current converters -- Research, Circuit switching -- Models, Business, Computers, Electronics, Electronics and electrical industries
Abstract

In this paper, a SPICE compatible time-domain equivalent circuit model of half-wave zero-current switch (HW-ZCS) is proposed, based up on which half-wave zero-current-switch quasi-resonant converters (HW-ZCS-QRC's) can be analyzed by using SPICE. As an example, a buck HW-ZCS-QRS has been analyzed by using SPICE to illustrate the applications of the equivalent circuit model proposed in this paper.

Published
1993

48. A Novel PCCM Boost PFC Converter With Fast Dynamic Response.

Author

Zhang, Fei and Xu, Jianping

Subjects
*ELECTRIC current converters, *ELECTRIC power factor, *DEGREES of freedom, *ELECTRIC potential, *ELECTRIC inductors, *ELECTRIC switchgear, *VOLTAGE regulators, *PROTOTYPES
Abstract

A novel pseudo-continuous conduction mode (PCCM) boost power-factor-correction (PFC) converter and its corresponding control strategy are proposed in this paper. Connecting a power switch in parallel with the inductor makes the boost converter operate in PCCM, which provides an additional degree of control freedom to realize PFC control. Therefore, a simple and fast voltage control loop of the PCCM boost PFC converter can be designed to realize output-voltage regulation. The additional degree of control freedom introduced by inductor current freewheeling operation of the PCCM boost PFC converter has been exploited through the dead-zone control technique, which can be dynamically adjusted in accordance with the output-voltage ripple. Compared with continuous conduction mode (CCM) boost PFC converter, the controller of the proposed PCCM boost PFC converter is much simpler. Moreover, the PCCM boost PFC converter benefits with reduced inductor-current ripple and improved power factor compared with boost PFC converter operating in discontinuous conduction mode (DCM). Analysis, simulation, and a 400-W prototype of the PCCM boost PFC converter have been presented and compared with those of boost PFC converters operating in conventional CCM and DCM. The results show that the dynamic response of the PCCM boost PFC converter is significantly faster than the existing boost PFC converter. [ABSTRACT FROM AUTHOR]

Published
2011
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