Fixed-frequency boundary control of buck converters with second-order switching surface

Yan, W.T.; Chung, Henry Shu-Hung; Au, K.T.K.; Ho, Carl Ngai Man

doi:10.1109/pesc.2008.4592000

Cited by 10 publications

(6 citation statements)

References 29 publications

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“…Second, a hysteresis band, which is noise sensitive, is needed. Although some fixed-frequency boundary control methods have been proposed, they require an additional feedback loop for regulating the switching frequency [33]- [35]. The state trajectory control in [36]- [38] makes the converter reach the steady state for a step change in the input or output in one on/off control.…”

Section: Introductionmentioning

confidence: 99%

Predictive control of buck converter using nonlinear output capacitor current programming

Cheung

Chung

Wang

2010

2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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A predictive control of buck converter to achieve fast transient response is presented. The methodology is based on using the output capacitor current and instantaneous output voltage to predict the output voltage at the end and mid of a switching cycle to determine the state of the main switch. Two switching criteria, one for switching on and one for switching off the main switch, will be formulated. The operating principles of the control method and all possible cases in the operation will be discussed. The proposed control method has been verified with experimental results of a 50W, 12V/5V buck converter prototype. The controller is realized by analogue devices. The steady-state and transient response to large-signal disturbances will be discussed.

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Section: Introductionmentioning

confidence: 99%

Predictive control of buck converter using nonlinear output capacitor current programming

Cheung

Chung

Wang

2010

2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…Recently, many time-domain dynamic control techniques with non-predictive boundary [1]- [8], such as hysteresis control [1]- [2] and sliding-mode control [3]- [5], or predictive boundary [6]- [7], have been proposed to be alternative to classical pulsewidth modulation scheme for switching converters. The main advantage of these methods is that they can provide fast transient response to large-signal disturbances, such as startup, load and reference disturbances.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, these two drawbacks are mutually influenced. Although some fixed-frequency boundary control methods have been proposed, they require an additional switching frequency control loop [8]. A control method [10] that tackles the above drawbacks and retains the advantages of the time-domain dynamic control technique is proposed.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the steady-state and dynamic characteristics of a buck converter with nonlinear output capacitor current programming

Cheung

Chung

Lo³

2010

2010 IEEE Energy Conversion Congress and Exposition

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A detailed steady-state and dynamic analysis of a buck converter with nonlinear output capacitor current programming is presented. The advantages of the proposed method are its constant switching frequency operation, simplicity in implementing the switching functions and designing the control parameters, good steady-state and dynamic responses, and high audio susceptibility rejection. The principle of operation and all possible operating cases will be described and discussed. With the inclusion of the effects of the equivalent series resistance (ESR) of the output capacitor, the steady-state output characteristics and small-signal models for studying the system stability will be derived.An experimental prototype of a 25W, 12V/5V buck converter has been built and evaluated.Index Terms-Predictive Control, buck converter, capacitor current control, dc/dc conversion.

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“…For example, variable frequency under different operating line/load conditions, sensitivity of the parameters of output filter, high inductor current peak. To handle THE HKIE TRANSACTIONS • Volume 17 Number 4 these issues, several techniques have been proposed for buck-converter (Yan et al, 2008;Babazadeh and Maksimovic ' , 2009;Corradini et al, 2009) to achieve fixed frequency, parameter independent solution or programmed inductor current. However, one remaining fundamental issue which poses great challenges is that the same concept cannot be easily applied to converters with non-minimum-phase characteristics (Redl and Sun, 2009).…”

Section: Introductionmentioning

confidence: 99%

A Uniform Nonlinear Control Method for DC-DC Converters with Fast Transient Response

Wang

Chung²

2010

HKIE Transactions

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Much effort has been made to the switching surface control of buck converter. However, it remains a fundamental challenge to apply the same concepts and associated control techniques to converters with non-minimum-phase characteristics. A nonlinear control method for all basic DC-DC converters (ie buck converter, boost converter, buck-boost converter, C ' uk converter and SEPIC) is proposed by deriving a uniform switching surface. It retains the advantages of boundary control for buck converter with second-order switching surface. For example, the converters can reach steady state in two switching actions after being subjected to large-signal disturbances. The derivations are general-oriented and can determine the circuit variables needed in the switching function. The same controller is universally applicable to different converters operating in both continuous conduction and discontinuous conduction modes. The potential applications lie in power conversions which require fast response to line/load changes, such as the point of load (POL) converters in the distributed power conversion system, power conditioning stage of the conversion system supplied by renewable energy sources, and so on. Design procedures and performance of the proposed control method applied on a 190 W 48/48 V buck-boost converter prototype will presented and compared with theoretical predictions.

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Fixed-frequency boundary control of buck converters with second-order switching surface

Cited by 10 publications

References 29 publications

Predictive control of buck converter using nonlinear output capacitor current programming

Predictive control of buck converter using nonlinear output capacitor current programming

Investigation of the steady-state and dynamic characteristics of a buck converter with nonlinear output capacitor current programming

A Uniform Nonlinear Control Method for DC-DC Converters with Fast Transient Response

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