A Constant Current Digital Control Method for Primary-Side Regulation Active-Clamp Flyback Converter

Wang, Chong; Sun, Dazhi; Zhang, Xiang; Hu, Jiayi; Gu, Wenhua; Gui, Sang

doi:10.1109/tpel.2020.3041602

Cited by 23 publications

(13 citation statements)

References 21 publications

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“…Recently, digital technology is also used to directly measure t dealy . Finally, t dealy is compensated to obtain accurate output current [17,20].…”

Section: The Amount Of Overflow Current I P δmentioning

confidence: 99%

“…With the advancement of digital technology and the cost of microcontrollers has dropped significantly. The control scheme of flyback is also moving towards digital control to obtain higher performance [17][18][19][20]. Since the flyback converter is an isolated converter, the output voltage and current are traditionally regulated by utilizing the secondary-side regulation (SSR).…”

Section: Introductionmentioning

confidence: 99%

“…The photocoupler feedback circuit causes above 10% of the power losses at standby conditions. Recently, primaryside regulation (PSR) flyback converter (i.e., primary-side controlled flyback converter) becomes an important technology due to lower cost and standby power losses [1,[17][18][19][20][21][22][23][24][25]. The primary-side controlled flyback converter stores energy on the transformer when the power switch is ON and releases the energy on the transformer to the load when the power switch is OFF.…”

Section: Introductionmentioning

confidence: 99%

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A Compensated Peak Current Mode Control PWM for Primary-Side Controlled Flyback Converters

Huang²,

Chou

et al. 2021

Energies

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In this paper, a feedback compensator (FBC) and a Feedforward compensator (FFC) are proposed to construct a novel compensated peak current mode control pulse width modulation (CPC-PWM) for primary-side controlled flyback converters. Using the proposed FBC, the PWM duty cycle of an abnormal operating flyback converter would be descended to limit the output current for reducing power dissipation. Using the proposed FFC, the effect of delay time would be descended to reduce the over-flow current for increasing the current accuracy. In this paper, the operating principle and mathematical model are described and analyzed. Then, the component values are well designed to satisfy the electrical specifications. Finally, a prototype is designed and realized to access system performance. The experimental results show that the proposed CPC-PWM can validate in a wide input voltage range and output short conditions, which also has good current accuracy and reduces power dissipation by about 68%.

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“…Recently, digital technology is also used to directly measure t dealy . Finally, t dealy is compensated to obtain accurate output current [17,20].…”

Section: The Amount Of Overflow Current I P δmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Compensated Peak Current Mode Control PWM for Primary-Side Controlled Flyback Converters

Huang²,

Chou

et al. 2021

Energies

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“…Due to the flyback structures applied to the coupled inductor to achieve galvanic isolation, the leakage inductance may cause a voltage spike across the power switches. 11,12 The isolated double step-down DC-DC converter is derived from a full bridge converter, which can reduce the voltage stresses of the primary-side switches to half of the input voltage and realize zero voltage switching (ZVS). 13 The MOSFET has drain-source on-resistance, and the diode has forward voltage drop and on-resistance.…”

Section: Introductionmentioning

confidence: 99%

“…In order to meet the safety regulations, galvanic isolation is suggested for high step‐down converters. Due to the flyback structures applied to the coupled inductor to achieve galvanic isolation, the leakage inductance may cause a voltage spike across the power switches 11,12 . The isolated double step‐down DC–DC converter is derived from a full bridge converter, which can reduce the voltage stresses of the primary‐side switches to half of the input voltage and realize zero voltage switching (ZVS) 13 .…”

Section: Introductionmentioning

confidence: 99%

Isolated high step‐down DC–DC converter with current‐doubler rectifier for ultracapacitor charger applications

Tseng,

Huang,

Hsiung

2023

Circuit Theory & Apps

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SummaryAn isolated high‐efficiency, high step‐down converter for ultracapacitor charger is presented. The proposed converter utilized the structure of switched inductors and combined the current‐doubler synchronous rectifier, which can reduce the secondary circulating currents. In addition, the energy of the leakage inductance can be recycled to reduce the voltage stresses of the switches. Therefore, the proposed converter can supply the requirement of charging high current, and keep converting high efficiency at the same time. The maximum efficiency of the proposed converter reaches 96.53% at 350 W, and the full load 1 kW is 94.31%, in the case of input voltage 380 V and output voltage 14.6 V. Finally, a 250 F ultracapacitor is charged by the proposed converter from 0 to 14.6 V with constant current (CC) and constant voltage (CV) modes in 1 min. The proposed converters can prove their feasibility by experimental results.

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An isolated high step‐down DC–DC converter with dual coupled inductors for ultracapacitor charger applications

Tseng,

Huang,

Hsiung

2024

Circuit Theory & Apps

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SummaryIn this paper, an isolated high efficiency, high step‐down DC–DC converter for ultracapacitor charger applications is presented. In the proposed converter, by utilizing the structure of asymmetrical half‐bridge that combined the current‐doubler synchronous rectifier and the technique of coupled inductors to achieve high step‐down. The step‐down conversion ratio of the proposed converter can be increased by decreasing the turns ratios of transformer and coupled inductors. In contrast to the conventional full‐bridge or half‐bridge converter, the proposed converter can operate in a high step‐down situation; the extreme low duty and turns ratios are not necessary. The theoretical results are verified by experimental results, in the case of 380 V input voltage and 14.6 V output voltage with rated power 1 kW. In addition, the 250F ultracapacitor charged by prototype of the proposed converter from 0 to 14.6 V in 1 min verified its feasibility.

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A Constant Current Digital Control Method for Primary-Side Regulation Active-Clamp Flyback Converter

Cited by 23 publications

References 21 publications

A Compensated Peak Current Mode Control PWM for Primary-Side Controlled Flyback Converters

A Compensated Peak Current Mode Control PWM for Primary-Side Controlled Flyback Converters

Isolated high step‐down DC–DC converter with current‐doubler rectifier for ultracapacitor charger applications

An isolated high step‐down DC–DC converter with dual coupled inductors for ultracapacitor charger applications

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