Enhanced Variable On-time Control of Critical Conduction Mode Boost Power Factor Correction Converters

Kim, Jungwon; Yi, Je-Hyun; Cho, Bo-Hyung

doi:10.6113/jpe.2014.14.5.890

Cited by 22 publications

(8 citation statements)

References 8 publications

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“…Boost converter inductor current ( ) and diode current ( ) can be expressed as (21) and (22) respectively.…”

Section: Design Of the Outer Voltage Loopmentioning

confidence: 99%

“…Another widely used technique to reduce the THD in PFC converters is the variable on-time (VOT) switching control technique by optimized the duty cycle of the PFC converter to decrease zero crossing distortion (ZCD) period [20][21][22][23], VOT switching control technique is reliable to reduce the THD in PFC converter but with complex mathematical analysis of the converter operation around the zero-crossing point in order to optimize the exact dead time around the zero-crossing point for exact on-time switching prediction [24]. This paper presents the small signal stability modeling of the conventional PFC boost converter proposed, and based on the signal stability model, an optimal integral-proportional (IP) current controller consists of double loop control strategy, where the integral gain feed forward to return the inductor current back to the reference set point, and the proportional gain implemented in the feedback path to increase the controller response.…”

Section: Introductionmentioning

confidence: 99%

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Optimal IP Current Controller Design Based on Small Signal Stability for THD Reduction of High-Power Density PFC Boost Converter

Okilly¹,

Baek²

2020

Preprint

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This paper presents an optimal design for the inner current control loop of the continuous current conduction mode (CCM) power factor correction (PFC) stage, which it can be used as the front stage of the two stages alternating current-direct current (AC-DC) telecom power supply. Conventional single-phase CCM-PFC boost converter usually implemented with using of the proportional-integral (PI) controllers in both of the voltage and current control loops, to regulate the output DC voltage to the specified value, moreover to maintains the input current follows the input voltage which offers converter with high power factor (P.F) and low current total harmonic distortion (THD). However, due to the slow dynamic response of the PI controller at the zero-crossing point of the input supply current, input current can’t fully follow the input voltage which leads to high THD. Digitally controlled PFC converter with an optimal design of the inner current control loop using doubly control loops IP controller to reduce the THD and to offer input current with unity P.F was performed in this paper. Furthermore, for the economic design of the digitally control PFC converter, two isolated AC and DC voltage sensors are proposed and designed for the interfacing with the microcontroller unit (MCU). PSIM software was used to test the converter performance with using the proposed designed current controllers and isolated voltage sensors. High power density digitally controlled telecom PFC stage with P.F of about 99.93%, full load efficiency of about 98.70% and THD less 5.50% is achieved in this work.

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“…Boost converter inductor current ( ) and diode current ( ) can be expressed as (21) and (22) respectively.…”

Section: Design Of the Outer Voltage Loopmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal IP Current Controller Design Based on Small Signal Stability for THD Reduction of High-Power Density PFC Boost Converter

Okilly¹,

Baek²

2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Another widely used technique to reduce the THD in PFC converters is the variable ontime (VOT) switching control technique by optimizing the duty cycle of the PFC converter to decrease the zero-crossing distortion (ZCD) period [20][21][22][23]. The VOT switching control technique can reliably reduce the THD in PFC converters, but uses complex mathematical analysis of the converter operation around the zero-crossing point to optimize the exact dead time around the zero-crossing point for exact on-time switching prediction [24].…”

Section: Introductionmentioning

confidence: 99%

Optimal IP Current Controller Design Based on Small Signal Stability for THD Reduction of a High-Power-Density PFC Boost Converter

2021

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This paper presents an optimal design for the inner current-control loop of the continuous current conduction mode (CCM) power factor correction (PFC) stage, which can be used as the front stage of the two-stage AC/DC telecom power supply. The conventional single-phase CCM-PFC boost converter is implemented with proportional–integral (PI) controllers in both the voltage and current-control loops to regulate the output DC voltage to the specified value and to ensure the input current follows the input voltage, which offers a converter with a high-power factor (PF) and low current total harmonic distortion (THD). However, due to the slow dynamic response of the PI controller at the zero-crossing point of the input supply current, the input current cannot fully follow the input voltage, which leads to high THD. In this paper, we investigate a digitally controlled PFC converter with an optimally designed inner current-control loop using a doubly-fed control loops integral-proportional (IP) controller to reduce the THD and to offer an input current with a unity PF. For the economic design of a digitally controlled PFC converter, two isolated AC and DC voltage sensors are designed for interfacing with the microcontroller unit (MCU). PSIM software as well as experimental prototype was used to test the converter performance using the proposed designed current controllers and isolated voltage sensors. We achieved a high-power-density, digitally controlled, telecom PFC stage with a power factor more than 99% and THD of about 5.50%.

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“…In conventional analog control methods, the inductor current is always detected using a sensing-resistor or hall-sensor [12]- [14]. In order to reduce the effect of noise, a threshold value which is compared with the inductor current is required.…”

Section: Introductionmentioning

confidence: 99%

A Novel Predictive Digital Controlled Sensorless PFC Converter under the Boundary Conduction Mode

Wang¹,

Maruta²,

Matsunaga³

et al. 2017

Journal of Power Electronics

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This paper presents a novel predictive digital control method for boundary conduction mode PFC converters without the need for detecting the inductor current. In the proposed method, the inductor current is predicted by analytical equations instead of being detected by a sensing-resistor. The predicted zero-crossing point of the inductor current is determined by the values of the input voltage, output voltage and predicted inductor current. Importantly, the prediction of zero-crossing point is achieved in just a single switching cycle. Therefore, the errors in predictive calculation caused by parameter variations can be compensated. The prediction of the zero-crossing point with the proposed method has been shown to have good accuracy. The proposed method also shows high stability towards variations in both the inductance and output power. Experimental results demonstrate the effectiveness of the proposed predictive digital control method for PFC converters.

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Enhanced Variable On-time Control of Critical Conduction Mode Boost Power Factor Correction Converters

Cited by 22 publications

References 8 publications

Optimal IP Current Controller Design Based on Small Signal Stability for THD Reduction of High-Power Density PFC Boost Converter

Optimal IP Current Controller Design Based on Small Signal Stability for THD Reduction of High-Power Density PFC Boost Converter

Optimal IP Current Controller Design Based on Small Signal Stability for THD Reduction of a High-Power-Density PFC Boost Converter

A Novel Predictive Digital Controlled Sensorless PFC Converter under the Boundary Conduction Mode

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