A Novel Winding-Coupled Buck Converter for High-Frequency, High-Step-Down DC–DC Conversion

Yao, Kaiwei; Qiu, Yang; Xu, Ming; Lee, F.C.

doi:10.1109/tpel.2005.854022

Cited by 152 publications

(48 citation statements)

References 5 publications

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“…The transfer function between the current command and the output voltage, with the current-loop closed, is (12) where is the number of phases. The corresponding openvoltage-loop output impedance is (13) Note that for high current-loop gain , both (12) and (13) become independent of the inductor value , since the current loop provides for this desensitivity [29,Ch.12]. Finally, the closed-loop output impedance of the converter is (14) where parameter models the loop delay, analogously to (7), and is the feedback control law.…”

Section: Voltage Feedback With Finite DC Gainmentioning

confidence: 99%

“…The transfer function between the current command and the output voltage, with the current-loop closed, is given by (12). The open-loop output impedance is given by (13). The feedforward control law is derived analogously to that in the voltage-mode case (25) Assuming high current-loop gain and ignoring the delay term , the feedforward law can be approximated by (26) The feedback control can use a PI law (27) since current-mode control provides a 20 dB/dec rolloff up to the current-loop bandwidth, and hence no derivative term is necessary.…”

Section: B Current-mode Controlmentioning

confidence: 99%

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Load-Line Regulation With Estimated Load-Current Feedforward: Application to Microprocessor Voltage Regulators

Peterchev

Sanders

2006

IEEE Trans. Power Electron.

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Abstract-A consistent framework for load-line regulation design is presented, applicable to microprocessor voltage regulators (VRs) using either electrolytic or ceramic output capacitors. With conventional feedback control, the loop bandwidth is limited by stability constraints linked to the switching frequency. The output capacitor has to be chosen sufficiently large to meet the stability requirement. Load-current feedforward can extend the useful bandwidth beyond that imposed by feedback stability constraints. With load-current feedforward, the size of the output capacitor can be reduced, since it is determined solely by large-signal and switchingripple considerations which are shown to be less constraining than the feedback stability requirement. This work points to the feasibility of microprocessor VR implementations using only a small number of ceramic output capacitors, while running at sub-megahertz switching frequencies.

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Section: Voltage Feedback With Finite DC Gainmentioning

confidence: 99%

Section: B Current-mode Controlmentioning

confidence: 99%

Load-Line Regulation With Estimated Load-Current Feedforward: Application to Microprocessor Voltage Regulators

Peterchev

Sanders

2006

IEEE Trans. Power Electron.

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“…Buck converters with multi-winding coupled inductors are proposed for obtaining large step-down voltage conversion along with the advantage of decreasing inductor current ripples [45,46]. The circuit diagram of multi-winding coupled inductor buck converter is shown in Figure 18.…”

Section: Figure 17 Four Winding Coupled Inductor Buck Converter Withmentioning

confidence: 99%

“…A buck converter employing switched-coupled-inductor cell is shown in Figure 19 [47]. The filter inductor of buck converter is replaced by a cell of two inversely coupled inductors and a diode.…”

Section: Figure 18 Multi Winding Coupled Inductor Buck Convertermentioning

confidence: 99%

A Review of Non-Isolated High Step-Down Dc-Dc Converters

Farooq¹,

Malik²,

Sun³

et al. 2015

IJSH

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“…Recently, an IBC with two coupled inductors are introduced [6,7]. Moreover, a high step-down conversion ratio is obtained and the switching losses can be reduced.…”

Section: Iiliterature Surveymentioning

confidence: 99%

Closed Loop Control of Transformerless Interleaved High Step-Down Conversion Ratio DC-DC Converter

Salna.V.A¹

2015

IJAREEIE

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This paper proposes closed loop control of transformerless interleaved high step-down conversion ratio dc-dc converter. The proposed converter utilizes two input capacitors which are series charged by the input voltage and parallel discharged by a new two phase interleaved buck converter for providing much higher conversion ratio without adopting an extreme short duty cycle. The proposed converter features uniform current sharing characteristic of the interleaved phases without adding extra circuitry. It also reduces the voltage stress of both switches and diodes. This will allow one to choose MOSFETs with low voltage rating to reduce both conduction and switching losses. Closed loop PI controller is used to control the error and finally achieves the desired output voltage. The operation principles, steady state analysis and comparison with other existing topologies are presented. Simulation results are presented to demonstrate the effectiveness of the converter. KEYWORDS:High step down conversion ratio, Interleaved Buck Converter (IBC), Closed loop, PI controller. I.INTRODUCTIONNowadays, for the increasing high step down ratios with high output current applications such as battery chargers, distributed power systems and VRMs of CPU boards, high performance dc-dc converters have been used. The conventional IBC is required operating at higher switching frequencies for high-input and low-output voltage applications, that will increase both switching and conduction losses. It also experiences an extremely short duty cycle in the case of high-input and low-output voltage applications [1]. Many step-down converters have been proposed to overcome the drawbacks of conventional IBC. II.LITERATURE SURVEYA quadratic buck converter [2] is synthesized by cascading two dc-dc buck converters. It can operate with wider ranges of step-down conversion ratio than conventional IBC but the efficiency is very poor. A three level buck converter [3] possess higher efficiency and better performance than the conventional IBC due to reduced voltage stress across the switch (half of the input voltage). However, so many components are required for this converter. An IBC with single capacitor turn off snubber is introduced in [4].By using this the switching loss associated with turn-off transition can be reduced and the single coupled inductor implements the converter as two output inductors, still the voltage across all the elements is same as input voltage.To reduce the switching losses, an active clamp IBC is introduced in [5], here all the switches are turned on with zero voltage switching (ZVS) whereas it requires additional passive elements and active switches, which increases the cost at low or middle levels of power applications. Recently, an IBC with two coupled inductors are introduced [6,7]. Moreover, a high step-down conversion ratio is obtained and the switching losses can be reduced. However, the leakage energy needs to recycle. A new extended duty ratio multiphase topology has been proposed to deal with a small duty...

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A Novel Winding-Coupled Buck Converter for High-Frequency, High-Step-Down DC–DC Conversion

Cited by 152 publications

References 5 publications

Load-Line Regulation With Estimated Load-Current Feedforward: Application to Microprocessor Voltage Regulators

Load-Line Regulation With Estimated Load-Current Feedforward: Application to Microprocessor Voltage Regulators

A Review of Non-Isolated High Step-Down Dc-Dc Converters

Closed Loop Control of Transformerless Interleaved High Step-Down Conversion Ratio DC-DC Converter

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