An Adaptive High-Precision OCP Control Scheme for Flyback AC/DC Converters

Wu, Qiang; Zhu, Zhangming

doi:10.1109/tpel.2017.2701507

Cited by 14 publications

(13 citation statements)

References 11 publications

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“…Then, by calculating the average current, a compensation control method that is theoretically unaffected by t dealy can be obtained [22]. Another method is to measure the mid-point current (i.e., average current) and use the average current control method, which can effectively reduce the influence of t dealy and increase the accuracy of the output current [23][24][25]. Recently, digital technology is also used to directly measure t dealy .…”

Section: The Amount Of Overflow Current I P δmentioning

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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Section: The Amount Of Overflow Current I P δmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Huang²,

Chou

et al. 2021

Energies

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“…Regarding the controllers proposed in the literature for battery charging systems that use flyback converters, most of the papers use linear controllers, while others use specialized controllers (like peak current control [21,34] or fuzzy controller [23]) or do not include a control structure [22,29,[31][32][33]35]. A cascade controller is used in [24][25][26], where the outer loop is a PI controller to regulate v b , and the inner loop is a PI that tracks a reference of the battery current (i b ).…”

Section: Introductionmentioning

confidence: 99%

Design and Control of a Battery Charger/Discharger Based on the Flyback Topology

2021

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Devices connected to microgrids require safe conditions during their connection, disconnection and operation. The required safety is achieved through the design and control of the converters that interface elements with the microgrid. Therefore, the design of both power and control stages of a battery charger/discharger based on a flyback is proposed in this paper. First, the structure of a battery charger/discharger is proposed, including the battery, the flyback, the DC bus, and the control scheme. Then, three models to represent the battery charger/discharger are developed in this work; a switched model, an averaged model, and a steady-state model, which are used to obtain the static and dynamic behavior of the system, and also to obtain the design equations. Based on those models, a sliding-mode controller is designed, which includes the adaptive calculation of one parameter. Subsequently, a procedure to select the flyback HFT, the output capacitor, and the Kv parameter based on operation requirements of the battery charger/discharger is presented in detail. Five tests developed in PSIM demonstrate the global stability of the system, the correct design of the circuit and controller parameters, the satisfactory regulation of the bus voltage, and the correct operation of the system for charge, discharge and stand-by conditions. Furthermore, a contrast with a classical PI structure confirms the performance of the proposed sliding-mode controller.

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“…With the rapid development of portable electronics and the quick charging technology of batteries, there is a growing need for significant power density improvement for travel chargers or adapters [1,2,3]. The flyback AC-DC converters for chargers have been widely used in portable devices [4,5,6,7], such as laptop, tablet and smart phone, etc. In flyback topology, the sensing of the outputs and communication of feedback signals for regulating output voltage or current is usually accomplished by utilizing external safe isolation components [8].…”

Section: Introductionmentioning

confidence: 99%

A synchronous rectified flyback AC-DC converter using capacitor-coupled isolated communication

2020

IEICE Electron. Express

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This paper presents a synchronous rectified (SR) flyback AC-DC converter based on capacitor-coupled isolated communication. Instead of bulky opto-couples as isolators, the proposed converter integrates an isolated capacitor to accomplish communication between the primary and secondary side, in an attempt to reduce system size. In secondary side, an adaptive zero-current detector (ZCD) for driving synchronous rectifier is adopted to increase efficiency. The converter is designed and fabricated in a 0.18-m BCD process. The experimental results demonstrate that our scheme shrinks the isolator size by a factor of 52.24 times and simultaneously improves the system efficiency by 3% with ZCD.

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An Adaptive High-Precision OCP Control Scheme for Flyback AC/DC Converters

Cited by 14 publications

References 11 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

Design and Control of a Battery Charger/Discharger Based on the Flyback Topology

A synchronous rectified flyback AC-DC converter using capacitor-coupled isolated communication

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