Primary Side Control For Flyback Converter Operating in DCM and CCM

Liang, Tsorng–Juu; Chen, Kai–Hui; Chen, Jiann-Fuh

doi:10.1109/tpel.2017.2709811

Cited by 66 publications

(15 citation statements)

References 25 publications

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“…To quantitatively compare the controls, we measured the rise time We compared conventional controllers and proposed controllers ( Table 5). The variable frequency peak current compensation method [14][15][16], which can ensure the local stability of the closedloop system, is used for the dual-mode FBC. It is vulnerable to the electrical noise and makes the output filter design become difficult.…”

Section: Experiments and Discussionmentioning

confidence: 99%

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Precise control strategy of dual‐mode flyback DC/DC converter

Kim

2019

IET Power Electronics

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Flyback converters (FBCs) have been widely used in portable fuel-cell power systems since they feature step up/ down ability, galvanic isolation between the input and output, and low cost. As the input/output voltage of the FBC varies, it may operate either in discontinuous-conduction mode (DCM) or in continuous-conduction mode (CCM). Since different modes of the FBC result in different dynamics, it is difficult to stabilise the converter operating in both modes. To solve the problem, the authors propose a controller that can control a dual-mode FBC whether it operates in DCM or in CCM. The proposed controller is composed of a dual-mode feed-forward control unit and a feedback control unit based on the common Lyapunov function. The dual-mode feed-forward control signal is utilised to reduce the burden on the common Lyapunov function-based feedback controller that must function well despite variable system dynamics. The closed-loop system guarantees global exponential stability and provides a fast transient response as the operating mode of the FBC switches between DCM and CCM. When constructing the proposed controller, they use the large-signal nonlinear averaged model of the dual-mode FBC and consider the parasitic components. Experimental tests were conducted to validate the proposed control scheme.

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Section: Experiments and Discussionmentioning

confidence: 99%

“…Thus, a controller that can be applied to both modes is necessary. Very recently, a peak current-mode controller is developed for the dual-mode FBC [14][15][16], but its dynamic response is not desirable under the wide variation of voltages or output load. Moreover, it can only ensure the local stability of the closed-loop system.…”

Section: Introductionmentioning

confidence: 99%

Precise control strategy of dual‐mode flyback DC/DC converter

Kim

2019

IET Power Electronics

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“…If the voltage of ith SC is lower than the average voltage, the CSi is low, the fly-back converter does not work and the short circuit switch SSi is on, and the cascaded converter module acts as wires. To improve the discharging power of the modularized converter module, the fly-back converters are operated in continuous current mode (CCM) [29]. The switch Si is driven by high frequency PWM Gsi.…”

Section: Working Principle Of the Propose Balancing Topologymentioning

confidence: 99%

“…The discharging power of the fly-back converter can be expressed as (3). To improve the discharging power of the modularized converter module, the fly-back converters are operated in continuous current mode (CCM) [29]. The switch S i is driven by high frequency PWM G si .…”

Section: Working Principle Of the Propose Balancing Topologymentioning

confidence: 99%

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A Modularized Discharge-Type Balancing Topology for Series-Connected Super Capacitor String

et al. 2018

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This paper proposed a modularized discharge-type topology for the voltage balance of series-connected super capacitor (SC) string. The proposed topology consists of cascaded converter modules and a boost converter. The cascaded converter modules discharge the higher voltage SCs directly with the ideal output current to realize a fast balancing speed and the boost converter feedbacks the extra energy from the higher voltage SCs to the super capacitor energy storage system (SCESS). The modular design of the cascaded converter modules makes the balancing system suitable for different voltage levels of SCESS. Unlike the charge-type topologies which discharge the higher voltage SCs indirectly, the proposed topology discharges the higher voltage SCs directly with a big current, and the over voltage phenomenon of SCs is then avoided, which means the reliability of the SCESS can be improved. The voltage stress of the switches inside the cascaded converter modules is low, which is different from the existing modularized discharge-type balancing topology. What is more, the control of cascaded converter modules and the boost converter can be implemented by analog devices which will simplify the control of the whole system. The control degree of freedom is high and the voltage of each cell can be controlled. An in-depth comparison analysis with the charge-type balancing topology is performed from the perspective of balancing speed and round-trip energy efficiency. The proposed topology and the balancing performance are confirmed by experimental results.

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Design of a 22 W (0.7 A) Current Controlled DC-DC Flyback Converter Operating in DCM Mode

Bhattacharya

Majumdar

2019

Lecture Notes in Electrical Engineering

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Primary Side Control For Flyback Converter Operating in DCM and CCM

Cited by 66 publications

References 25 publications

Precise control strategy of dual‐mode flyback DC/DC converter

Precise control strategy of dual‐mode flyback DC/DC converter

A Modularized Discharge-Type Balancing Topology for Series-Connected Super Capacitor String

Design of a 22 W (0.7 A) Current Controlled DC-DC Flyback Converter Operating in DCM Mode

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