Pulse Train Control Strategy for CCM Boost PFC Converter With Improved Dynamic Response and Unity Power Factor

Luo, Huan; Xu, Jianping; He, Dayin; Sha, Jin

doi:10.1109/tie.2019.2962467

Cited by 45 publications

(15 citation statements)

References 26 publications

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“…It can be seen from Fig. 9 that, the bandwidth of the control loop is 18Hz, which is within the limit of 20Hz for PFC system [25]. The phase margin is 54°, which is sufficiently larger than the general stability requirement of 45°.…”

Section: Experimental Verificationmentioning

confidence: 82%

“…According to the control loop design procedures of PFC converter [24], KP and KI, as well as the output voltage sensing gain are designed as 0.35 35 and 0.1, respectively. Since the PFC converter is a timevarying system, in order to analyze the bandwidth and stability of the control loop, the "frozen coefficients" method [25] is utilized. The system is frozen at the point that is assumed to be the most critical for its stability, i.e., when input voltage vrec = Vm|sin(ωt)| gets the peak and load is full.…”

Section: Experimental Verificationmentioning

confidence: 99%

“…Power factor correction (PFC) converters have been widely used in AC to DC power conversions to achieve high power factor (PF) and low total harmonic distortion (THD) of input current [1][2][3][4][5][6]. Flyback converter is one of the most popular topologies for the applications of PFC converter [7][8][9][10][11][12][13][14][15], because it exhibits lots of advantages, such as input and output isolation capability, simple structure, and low cost.…”

Section: Introductionmentioning

confidence: 99%

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An Adaptive Off-Time Controlled DCM Flyback PFC Converter With Unity Power Factor and High Efficiency

et al. 2021

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Constant duty cycle controlled discontinuous conduction mode (DCM) flyback power factor correction (PFC) converter has the advantage of high power factor (PF) and the disadvantage of low efficiency. While constant on-time (COT) controlled critical conduction mode (CRM) flyback PFC converter has the exact opposite features, besides its switching frequency varies in a line cycle, and the variation range is very large, which complicates the electromagnetic interference (EMI) design. In order to obtain both benefits of these two control methods, an adaptive off-time (AOT) control technique for DCM flyback PFC converter is proposed in this paper. By utilizing the output voltage and the amplitude of line voltage to adjust the off-time of the main switch, the magnetizing current of transformer exactly operates in CRM when the rectified input voltage gets the peak. Thus, the root-mean-square (RMS) current of the main switch and the diode, as well as the conduction loss can be effectively reduced, and high efficiency can be obtained. The proposed control technique also can achieve theoretical unity PF over universal input voltage range of 90~264VAC. Moreover, its variation range of switching frequency is greatly reduced compared to that of COT control. A 60W prototype has been fabricated and tested in the laboratory and experimental results are presented to verify the effectiveness of the proposed method.

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Section: Experimental Verificationmentioning

confidence: 82%

Section: Experimental Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Adaptive Off-Time Controlled DCM Flyback PFC Converter With Unity Power Factor and High Efficiency

et al. 2021

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“…The interleaved boost PFC and the related advantages have been reported in the past literature [1]. Here, Figure 1 illustrates the block-diagram of the test system, including two interleaved boost PFCs, EMI receiver, LISN and EMI filter, and the boost-inductor design for continuous conduction mode (CCM) [16,17] operation has already provided in the literature. So, for the simplicity, only the widely used equations are specified in this subsection, and the boost inductor size for CCM operations is obtained by (5) assuming 22% input ripple current according to [18]:…”

Section: Required Emi Filter Attenuation In Interleaving Units Using Conventional Phase Shiftmentioning

confidence: 99%

Differential Mode Noise Estimation and Filter Design for Interleaved Boost Power Factor Correction Converters

2021

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Interleaved power factor correction (PFC) is widely used circuit topology due to good efficiency and power density for single-switch boost PFC. As the differential mode (DM) electromagnetic interference (EMI) noise magnitude depends upon the input current ripple, this research details a comprehensive study of DM EMI filter design for interleaved boost PFC with the aim of minimizing the component size. It is also demonstrated that the different numbers of interleaved stages and switching frequency influence the filter attenuation requirement and, thus, the EMI filter size. First, an analytical model is derived on the basis of the Norton equivalent circuit model for the differential mode noises of interleaved boost PFC within the frequency range of 9–500 kHz. The derived model can help identify the proper phase shifting among the interleaved boost converters in order to minimize the considered differential mode noises at the filter design frequency. So, a novel phase-shift method is developed to get a minimized attenuation required by a filter in Band B. Further, a volume optimization of the required DM filter was introduced based on the calculated filter attenuation and volumetric component parameters. Based on the obtained results, unconventional and conventional phase shifts have demonstrated a good performance in decreasing the EMI filter volume in Band B and Band A, respectively. A 2-kW interleaved PFC case study is presented to verify the theoretical analyses and the impact of phase-shifting on EMI filter size.

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“…Control strategyThe well-known on-time control for the boost PFC is not suitable for the IWJ topology-based PFC because of their different dynamic model[25][26][27][28]. Other sophisticated algorithms are beyond the discussion scope of this letter leaving for future research[29][30]. The classical average current control algorithm is modified and illustrated in Fig.5, which is realized digitally to manipulate the IWJ topology-based PFC stage.…”

mentioning

confidence: 99%

Active PFC stage based on synchronous inverse Watkins-Johnson topology

Luo

2021

IEICE Electron. Express

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Active power factor correction (PFC) technique is effectively used to improve the power factor and reduce the power exchanging loss, which behaves as a PWM-controlled emulated resistance to the ac power line. The boost topology and its derivatives are commonly applied for PFC stage. In this letter, from a topological point of view, an improved inverse Watkins-Johnson (IWJ) topology-based PFC stage is proposed, which holds several merits including ease of driving, synchronous mode, high efficiency, extra control dimension, and so forth. Theoretical analysis is conducted and an experimental prototype has been constructed to prove the feasibility of the proposed concept.

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Pulse Train Control Strategy for CCM Boost PFC Converter With Improved Dynamic Response and Unity Power Factor

Cited by 45 publications

References 26 publications

An Adaptive Off-Time Controlled DCM Flyback PFC Converter With Unity Power Factor and High Efficiency

An Adaptive Off-Time Controlled DCM Flyback PFC Converter With Unity Power Factor and High Efficiency

Differential Mode Noise Estimation and Filter Design for Interleaved Boost Power Factor Correction Converters

Active PFC stage based on synchronous inverse Watkins-Johnson topology

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