An Online Monitoring Method of Circuit Parameters for Variable On-Time Control in CRM Boost PFC Converters

Ren, Xiaoyong; Wu, Yu; Guo, Zhehui; Zhang, Zhiliang; Chen, Qianhong

doi:10.1109/tpel.2018.2828988

Cited by 38 publications

(13 citation statements)

References 20 publications

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“…By substituting (22)- (26) into (21), and ignoring the second-order and DC items, the following equation can be obtained…”

Section: Modelling Of the Dcm Operation Boost Pfc Converter With Vicmentioning

confidence: 99%

“…Generally, the CRM operation boost PFC converter is adopted in the medium or low power applications [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…However, the boost inductor current ripple is large, which results in high conduction losses for the semiconductors; in addition, in order to achieve the CRM operation, the boost inductor current should be detected to generate the switching signal, and the switching frequency is adjusted, so a wide switching frequency operation range is required, which complicates the design of the boost inductor, electromagnetic interference (EMI) filter, driver circuit, and control circuit. Generally, the CRM operation boost PFC converter is adopted in the medium or low power applications [20–22].…”

Section: Introductionmentioning

confidence: 99%

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Analysis and design of the DCM operation boost PFC converter with magnetic control

Wei

Luo

Wang

et al. 2019

IET Power Electronics

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In this study, a novel control scheme for the discontinuous conduction mode (DCM) operation boost power factor correction (PFC) converter is proposed. Instead of adopting constant duty cycle (CDC) control, variable duty cycle control or frequency control, the magnetic control or variable inductor control is adopted to regulate the output voltage, so CDC and switching frequency can be implemented for the switch. The operation principles of the proposed control scheme are discussed in details, and the analysis of the input current, power factor, boundary condition and design considerations are presented. In addition, the modelling of the variable inductor and the DCM operation boost PFC converter with variable inductor are derived in detail, by linearising the non-linear components, the model of the DCM operation boost PFC converter with the proposed control scheme can be obtained, and the design procedures of the PI controller are presented. Finally, a 70 W experimental prototype is built to verify the theoretical analysis and the effectiveness of the proposed control scheme.

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“…By substituting (22)- (26) into (21), and ignoring the second-order and DC items, the following equation can be obtained…”

Section: Modelling Of the Dcm Operation Boost Pfc Converter With Vicmentioning

confidence: 99%

“…Generally, the CRM operation boost PFC converter is adopted in the medium or low power applications [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis and design of the DCM operation boost PFC converter with magnetic control

Wei

Luo

Wang

et al. 2019

IET Power Electronics

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“…However, the nonlinear relationship with junction voltage makes it complex to intuitively understand the resonance behaviour of these parasitic capacitors. To simplify the resonant process, parasitic capacitors are considered as a constant value in a boost circuit based on GaN HEMT [16][17][18]. In order to evaluate a proper VS/ZVS time, it is necessary to discuss the resonant process with nonlinear capacitors in detail.…”

Section: Introductionmentioning

confidence: 99%

Extended Off-Time Control for CRM Boost Converter Based on Piecewise Equivalent Capacitance Model

et al. 2020

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Valley-switching (VS) and zero-voltage switching (ZVS) improves overall efficiency in critical conduction mode (CRM) boost converters. To achieve VS/ZVS, off-time of the main switch is often extended to match the resonance period by circuit inductor and parasitic capacitors of switching components. In this paper, a piecewise equivalent model for parasitic capacitors is proposed to derive analytical solutions of the resonant process, by which the numerical solutions of VS/ZVS time is calculated. To precisely achieve VS/ZVS in a boost converter, corresponding extended off-time based on the numerical solutions is implemented with an extended off-time (EOT) controller. The EOT controller makes the inductor volt-second unbalance in continuous conduction mode (CCM) operation during one switching cycle, leading to the convergence to CRM operation. The analytical and experimental results correct the results derived by conventional equivalent model for parasitic capacitors, which leads to deviated VS/ZVS boundary and wrongly calculated off-time. The proposed model and controller are verified in a nonsynchronous CRM boost converter based on GaN high electron mobility transistor (HEMT) and SiC diode. With the derived extended off-time, a peak efficiency of 99.15% is achieved at output power level of 200W. INDEX TERMS Critical conduction mode, parasitic capacitance, piecewise equivalent capacitance model, extended off-time control, boost converter.

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“…However, the power factor decreases due to the large current distortion that occurs when switching frequency is limited in light-load and low-input-voltage conditions. Additionally, a valley switching strategy has been proposed to improve the efficiency and power factor [10][11][12][13][14][15][16]. The existing valley switching strategy can reduce the switching loss by switching at the valley point generated during inductance and capacitance (LC) resonance, in contrast to the CRM method of switching when the diode current becomes zero.…”

Section: Introductionmentioning

confidence: 99%

CRM PFC Converter with New Valley Detection Method for Improving Power System Quality

2019

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High efficiency and the power factor of power converters, are very important factors which can improve power system quality. In particular, research on improving low efficiency and the power factor at light-load conditions is essential. A boost power factor correction (PFC) is most commonly used in home appliances, with several operations being at light-loads; the critical conduction mode (CRM) control, fixed ON-time control, and valley detection technique are mainly applied to PFC control. However, these control schemes have the following problems: (1) low efficiency, due to sudden increase in switching frequency at light-loads; and (2) low power factor, due to switching ON-time limitation. This paper presents a new valley detection method that can actively extend the fixed ON-time to overcome these problems. Furthermore, a new valley point detection circuit and an ON-time extension signal generation circuit are proposed and described in detail. The superiority of the proposed method is demonstrated via comparison with two existing CRM PFC control methods, namely fixed ON-time (conventional#1) and existing valley detection (conventional#2) methods. Experimental results at 20% load demonstrate that the proposed method shows an efficiency improvement of 2.1%, compared with the fixed ON-time strategy; and a power factor improvement of 34.9%, compared with the existing valley detection strategy.

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An Online Monitoring Method of Circuit Parameters for Variable On-Time Control in CRM Boost PFC Converters

Cited by 38 publications

References 20 publications

Analysis and design of the DCM operation boost PFC converter with magnetic control

Analysis and design of the DCM operation boost PFC converter with magnetic control

Extended Off-Time Control for CRM Boost Converter Based on Piecewise Equivalent Capacitance Model

CRM PFC Converter with New Valley Detection Method for Improving Power System Quality

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