Digital Dead Time Auto-Tuning for Maximum Efficiency Operation of Isolated DC-DC Converters

Pizzutelli, A.; Carrera, Andrea; Ghioni, M.; Saggini, S.

doi:10.1109/pesc.2007.4342097

Cited by 11 publications

(6 citation statements)

References 7 publications

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“…This method is based on maximum power point tracking (MPPT), commonly used on solar arrays. Pizzutelli et al [18] proposes another sensorless dead time control method based on input current. It claims to improve over [17] because it can never get stuck at local minima and it is suitable for high efficiency (>90 %) applications, where the small current variations cannot be easily measured.…”

Section: Sensorless Methodsmentioning

confidence: 99%

“…The output of the accumulator is positive, which means t d2 yields the lowest input current, therefore being more efficient[18].This forces the duty cycle control loop to apply a correction by adding duty cycle to increase this average. Since the duty cycle control loop is much faster than the dead time control loop, it is possible to reduce the dead time in small steps and monitor the current duty cycle value.…”

mentioning

confidence: 99%

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On the Impact of Timer Resolution in the Efficiency Optimization of Synchronous Buck Converters

Amaral¹,

Duarte²,

Costa³

2015

IJPEDS

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Excessive dead time in complementary switches causes significant energy losses in DC-DC power conversion. The optimization of dead time prevents the degradation of overall efficiency by minimizing the body diode conduction of power switches and, as a consequence, also reduces reverse recovery losses. The present work aims at analyzing the influence of one of the most important characteristics of a digital controller, the timer resolution, in the context of dead-time optimization for synchronous buck converters. In specific, the analysis quantifies the efficiency de-pendency on the timer resolution, in a parameter set that comprises duty-cycle and dead-time, and also converter frequency and analog-to-digital converter accuracy. Based on a sensorless optimization strategy, the relationship between all these limiting factors is described, such as the number of bits of timer and analog-to-digital converter. To validate our approach experimental results are provided using a 12-to-1.8V DC-DC converter, controlled by low- and high-resolution pulse-width modulation signals generated with an XMC4200 microcontroller from Infineon Technologies. The measured results are consistent with our analysis, which predicts the power efficiency improvements not only with a fixed dead time approach, but also with the increment of timer resolution.

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Section: Sensorless Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

On the Impact of Timer Resolution in the Efficiency Optimization of Synchronous Buck Converters

Amaral¹,

Duarte²,

Costa³

2015

IJPEDS

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show abstract

“…Various techniques exist that manipulate dead time of dc-dc converters with the goal of increasing efficiency [4][5][6][7][8][9][10]. Some of them require additional components for sensing [6,8] or for energy "sloshing" [2,5]. Additional components adds to the complexity, cost and volume of the converter.…”

Section: Introductionmentioning

confidence: 99%

Light Load Efficiency Improvements in Dual Active Bridge Converters via Dead time Control

Santiago-González

Otten

2018

2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL)

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Many converters suffer from poor efficiency at light loads even though much of their lifetime is spent at lightly loaded conditions. During normal operation, the dual active bridge (DAB) family of converters loses soft switching at low power levels, leading to poor light-load efficiency. In this paper a control approach for DAB converter is investigated that enhances their light-load efficiency via dead time control. A model is developed that captures the relationship between output power and dead time, and is used to formulate a control approach for light-load operation. Experimental results from a prototype converter validate the proposed approach.

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“…In the conventional control methods, the dead-time is constant regardless of the load conditions, which results in additional loss due to the switch body diode reverse recovery and conduction. In [15][16][17], the dead-time is adaptively adjusted based on the load conditions and the efficiency can be improved over a wide range of load condition. Though these methods are effective in synchronous buck converter, they are difficult to be implemented in PSFB converter since the dead-time is needed to avoid overshooting and to achieve ZVS operation.…”

Section: Introductionmentioning

confidence: 99%

Operation analysis of a phase‐shifted full‐bridge converter during the dead‐time interval

Zhao

Hou

et al. 2016

IET Power Electronics

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During the dead-time interval for a phase-shifted full-bridge (PSFB) converter, switches can achieve zero-voltage switching (ZVS) operation by using the energy stored in the transformer leakage inductance to discharge or charge the output capacitance of the switches. The value of dead-time has a great effect on ZVS range so it is a key parameter that needs to be optimised during designing the converter. This study develops theoretical analysis to estimate the dead-time as a function of load current for PSFB converter. The equivalent circuits of PSFB converter during the deadtime interval with considering magnetising inductance are mainly analysed in this study. Compared with previous analyses, the influences of dead-time on ZVS range and efficiency are discussed in detail. The analysis results show that the magnetising inductance of transformer can ensure ZVS over a wide range of load conditions, especially under discontinued current mode operation, without a penalty on the heavy-load efficiency. By adjusting the dead-time dynamically, both conduction and switching losses can be reduced. A 1 kW prototype is implemented and experimental results are consistent with the theoretical analysis.

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Digital Dead Time Auto-Tuning for Maximum Efficiency Operation of Isolated DC-DC Converters

Cited by 11 publications

References 7 publications

On the Impact of Timer Resolution in the Efficiency Optimization of Synchronous Buck Converters

On the Impact of Timer Resolution in the Efficiency Optimization of Synchronous Buck Converters

Light Load Efficiency Improvements in Dual Active Bridge Converters via Dead time Control

Operation analysis of a phase‐shifted full‐bridge converter during the dead‐time interval

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