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Start Over Author "Xu, Jianping" Journal ieee transactions on power electronics
36 results on '"Xu, Jianping"'

4. Capacitance-Multiplexed Current Source Charge Pump Power Factor Correction Converter With Wide Input Voltage Range

Author

Yang, Ping, Sun, Yijie, Peng, Yusheng, Zhao, Silin, Zheng, Gao, and Xu, Jianping

Abstract

Power factor correction (PFC) technology has been widely used to reduce the harmonic pollution of power electronic equipment. The single-stage PFC converter composed of a current source charge pump (CS-CP) has a simple structure and high power factor (PF), but the operating range is narrow. Based on the single-stage CS-CP PFC converter, a capacitance-multiplexed CS-CP PFC converter is proposed in this article, reducing a diode and improving the efficiency. An LLC half-bridge resonant circuit is used as a current source to provide high-frequency current into the charge pump to achieve PFC. By reusing the resonant capacitors as the charge pump capacitor, the simple structure of the CS-CP PFC converter is preserved, and the problem that the converter can only obtain high PF in a narrow input voltage range is solved. So that the proposed converter can achieve high PF in a wide input range of 100–242 VAC. Finally, the theoretical analysis is verified by the simulation and experiment.

Published
2024
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5. A Novel Series Capacitor Isolated DC–DC Converter With Reduced Voltage Stress of Primary Switches, Full-Range ZVS Operation, and Improved Light-Load Efficiency

Author

Li, Xiaobin, Ma, Hongbo, Yi, Junhong, Lu, Song, Jia, Mingming, Xu, Jianping, and Feng, Quanyuan

Abstract

To target the 80 Plus 380 Vdc Titanium specifications, this article proposed a novel fixed-frequency isolated dc–dc converter with full-range zero voltage switching (ZVS). Different from the conventional phase-shift full-bridge (PSFB) converter, the series capacitor structure and series-connected two transformers are incorporated in the proposed converter to achieve full-range ZVS operation and light-load efficiency improvement. First, the voltage stress of three primary switches is reduced to half of the input voltage because of the special series capacitor structure. Correspondingly, the energy needed for obtaining the ZVS operation of all primary-side switches is reduced by one-fourth of conventional methods. Furthermore, the employed series-connected two transformers not only achieve the full-range ZVS operation but also eliminate an output inductor presented in conventional PSFB converters. Therefore, higher efficiency can be achieved. In conclusion, low voltage stress, full-range ZVS operation, and fixed switching frequency are the main advantages of the proposed converter. A 360–440 V, 12 V/50 A prototype is built to verify the claimed features of the proposed converter. Experimental waveforms show the ZVS operation under the entire range. The measured efficiency is higher than 95% from 14 A load up to full load, and the peak efficiency of 96.7% can be achieved for 360 V at 25 A load.

Published
2024
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16. Small Signal Modeling and Transient Cross-Regulation Analysis of Peak-Current-Mode-Controlled SIDO Buck LED Driver

Author

Wang, Yao, Xu, Jianping, Chen, Zhangyong, and Qin, Fuban

Abstract

Single-inductor dual-output (SIDO) dc–dc converter has been applied to light-emitting diode (LED) drivers with its advantages of small volume and low cost. Peak-current-mode (PCM) control of the SIDO converter has the advantages of fast transient performance and suppressed cross-regulation. A PCM-controlled SIDO buck LED driver to achieve independent dimming and to eliminate the steady-state cross-regulation is proposed in this article. The circuit and the principle of the PCM-controlled SIDO buck LED driver are presented, and its small signal model is established based on inductor current ripple. Furthermore, based on control-to-output loop gain transfer functions, control parameters of PCM-controlled SIDO buck LED driver are designed to achieve independent output current regulation of each LED driver. Besides, cross-regulation transfer functions are obtained to investigate the effect of reference signals and control parameters on the transient cross-regulation. Moreover, the effect of capacitor parameters on the stability of the LED driver is analyzed based on the bifurcation diagram. Finally, experimental results are provided to show the independent dimming capability of PCM-controlled SIDO buck LED driver with designed parameters, and the validity of the theoretical analysis on transient cross-regulation and stability of the LED driver.

Published
2023
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28. A unified averaging technique for the modeling of quasi-resonant converters

Author

Xu, Jianping and Lee, C.Q.

Subjects
Electric current converters -- Models, Power electronics -- Models, Business, Electronics, Electronics and electrical industries
Abstract

A unified averaging technique, here called the generalized state-space averaging (GSSA) technique, for the analysis of a class of periodically switched networks is proposed in the present paper. The basic assumption of GSSA is that the switching frequency must be much higher than the highest natural frequency of the networks, while the input variables can be bounded fast time-varying functions. It is shown in this paper that the GSSA approach generalizes the idea of the averaging technique to overcome the limitations of the conventional state-space averaging method, which prevents us from applying it to quasi-resonant converters (QRC's). The application of GSSA to the analysis of QRC's has been illustrated via examples of the zero-current switching QRC buck converter and zero-voltage switching QRC boost converter. Its accuracy has been verified by numerical simulation and experimental results. Index Terms - Averaging technique, modeling, quasi-resonant converters.

Published
1998

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