Pulse Train Control Technique for Flyback Converter

Telefus, M.; Shteynberg, A.; Ferdowsi, Mehdi; Emadi, Ali

doi:10.1109/tpel.2004.826498

Cited by 75 publications

(27 citation statements)

References 2 publications

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“…In existing PT control, the sampled output voltage decides whether to generate high or low pulses with purely DCM operation [8]. In a buck converter during Mode 1, the inductor current, i L , ramps up during ON time of the MOSFET.…”

Section: A Discrete-time Modelingmentioning

confidence: 99%

“…Nevertheless, it still remains difficult to achieve spread spectrum using above methods. Pulse train (PT) control technique improves light load efficiency by using high and low pulses with different frequencies [8]- [12]. Beside efficiency improvement, this bi-frequency operation (BFO) provides an unique opportunity for achieving spread spectrum in light load DC-DC converters.…”

Section: Introductionmentioning

confidence: 99%

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Voltage-mode digital pulse train control for light load DC-DC converters with spread spectrum

Kapat

2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Pulse train (PT) control improves light load efficiency in a DC-DC converter and also enables to achieve spread spectrum using bi-frequency operation (BFO). However, existing PT control shows existence of sub-harmonic oscillations; thus periodic BFO cannot be ensured. This paper proposes digital voltage-mode PT control in DC-DC converters, in which on-time of an active pulse is generated from DPWM output (similar to voltage mode control) for a predefined sequence of pulses. Discrete-time models are derived, which confirm stable BFO with predictable spectral behavior. This enables to further optimize efficiency, to meet EMI compliance, and to achieve smooth PT/PWM transition because of sharing the outer voltage loop. A buck converter prototype is made, and the proposed scheme is implemented using an FPGA device.

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Section: A Discrete-time Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Voltage-mode digital pulse train control for light load DC-DC converters with spread spectrum

Kapat

2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…Traditionally, a Flyback converter is an isolated buck-boost converter [16], [17]. Taking the turns ratio into account as an extra degree-of-freedom, both the output voltage and the current are affected.…”

Section: Introductionmentioning

confidence: 99%

Output Voltage Ripple Analysis and Design Considerations of Intrinsic Safety Flyback Converter Based on Energy Transmission Modes

Hu¹,

Zhang²,

Xu³

et al. 2014

Journal of Power Electronics

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For the purpose of designing an intrinsic safety Flyback converter with minimal output voltage ripple based on a specified output current, this paper first classified the energy transmission modes of the system into three sorts, namely, the Complete Inductor Supply Mode-CCM (CISM-CCM), the Incomplete Inductor Supply Mode-CCM (IISM-CCM) and the Incomplete Inductor Supply Mode-DCM (IISM-DCM). Then, the critical secondary self-inductance assorting the three modes are deduced and expressions of the output voltage ripples (OVR) are presented. For a Flyback converter with constant loads and switching frequency, it is shown that the output voltage ripple in the CISM-CCM is the smallest and that it has no relationship with the secondary self-inductance. Otherwise, the OVR of the other two modes are bigger than the previously mentioned one. It is concluded that the critical inductance between the CISM-CCM and the IISM-CCM is the minimal secondary self-inductance to ensure the smallest output voltage ripple. At last, a design method to guarantee the minimum OVR within the scales of the input voltage and load are analyzed, and the minimum secondary self-inductance is proposed to minimize the OVR. Simulations and experiments are given to verify the results.

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“…The self-tuning PSM controller is dissimilar with the pulse train control technique [4,5] or the double Pulse Frequency Modulation (PFM) control method [6] . The principle of the novel self-tuning PSM technique is introduced firstly.…”

Section: Introductionmentioning

confidence: 99%

“…Based on (3) the relationships between output voltage at the end of each period and modulation factor M and load resistances R for a PSM boost converter in DCM are obtained in Fig 3) implies that the discrete control close-loop system keeps stable due to 1 β < [4] . While, PWM converter in DCM could has chaos phenomena with unsuitable circuit parameters [8] .…”

Section: Introductionmentioning

confidence: 99%

Self-tuning PSM controller based on state machine

Luo

Zhen

et al. 2008

APCCAS 2008 - 2008 IEEE Asia Pacific Conference on Circuits and Systems

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A self-tuning Pulse Skip Modulation (PSM) controller based on state machine is proposed in this paper. Four kinds of duty ratios are designed in the self-tuning PSM controller to balance the input energy and output energy. With which, the self-tuning PSM controller can make the power switch converter response quickly and the energy transfer better, as well as, avoid the real switching frequency entering into audible range with small output voltage ripple besides good stability and high efficiency. Analyses, simulations and experiments show the selftuning PSM control technique based on the state machine is a good regulating mode for power converter.

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Pulse Train Control Technique for Flyback Converter

Cited by 75 publications

References 2 publications

Voltage-mode digital pulse train control for light load DC-DC converters with spread spectrum

Voltage-mode digital pulse train control for light load DC-DC converters with spread spectrum

Output Voltage Ripple Analysis and Design Considerations of Intrinsic Safety Flyback Converter Based on Energy Transmission Modes

Self-tuning PSM controller based on state machine

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