High performance predictive dead-beat digital controller for DC power supplies

Bibian, S.; Jin, Hua

doi:10.1109/apec.2001.911629

Cited by 46 publications

(29 citation statements)

References 11 publications

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“…The drawback with slow voltage loop is high ripple voltage, which is acceptable for an inverter load [16]. Also, a difference in bandwidths of voltage and current loops has been proposed [17][18][19][20] to introduce time scale separation in their dynamics, which is then utilized to make approximations to simplify the design and discussed in [11]. Current-mode control is preferred for fuel cell system [21].…”

Section: Frequency Response Curves and Simulation Resultsmentioning

confidence: 99%

Small Signal Modeling and Closed Loop Control Design of ZVS Current-fed Half-Bridge L-L Type Dc/Dc Converter with Active-Clamp

Rathore¹,

Bhat²,

Oruganti³

2010

IJCEE

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Abstract-This I. INTRODUCTIONA high-frequency (HF) transformer isolated DC-DC converter is part of a fuel cell power conditioning system for standalone or utility interface [1][2] used to boost low fuel cell stack voltage (that can vary with fuel pressure [3]) higher than the peak of the grid or rated load voltage. This stepped up DC voltage is converted into line-frequency grid/load compatible AC power supply using an inverter stage [1][2]. Soft-switching is necessary to operate the converter at higher switching frequency to achieve small size, light weight and low cost converter. Although an active-clamped DC-DC current-fed converter and its analysis and design have been recently published [2] [4][5], this converter can not maintain ZVS for wide variation in supply voltage and load variations. Therefore, a modified L-L type active-clamped current-fed ZVS DC-DC converter, shown in Fig. 1 has been proposed for this application [6]. This converter always operates with Manuscript received September 20, 2009. This work was supported by a grant from the Natural Sciences and Engineering Research Council (NSERC) of Canada.Akshay K Rathore is with the Department of Electrical and Computer Engineering, University of Illinois, Chicago, IL 60607 USA. (phone: 312-996-9548; e-mail: arathore@ uic.edu).Ashoka K. S. Bhat is with Department of Electrical and Computer Engineering, University of Victoria, Victoria, BC V8W 3P6 Canada. (e-mail: bhat@engr.uvic.ca).Ramesh Oruganti is with the Department of Electrical and Computer Engineering, National University of Singapore, Singapore (e-mail: eleramsh@nus.edu.sg).the duty cycle of main switches greater than 50% and in continuous current mode. The two main switches S 1 and S 2 are controlled by gating signals phase-shifted by 180 o .Auxiliary switches S a1 and S a2 are gated by signals complementary to main switch gating signals. The two inductors are identical but uncoupled to each other.This front-end DC-DC converter should be controlled to produce a constant voltage at the input of the inverter for all fuel pressure values. This requires small signal modeling and closed loop control design of this converter and they are not yet reported in literature and therefore form the objectives of this paper. The peak current control requires slope compensation for stability and introduces error at high ripple currents at light load and high input voltage. Therefore, average current control of the two inductor currents is used in this paper. In literature, the current control of a single inductor and coupled inductor converter topologies are presented [7][8][9][10]. The current control of two independent (uncoupled) inductor topology was presented in [11] for active-clamped ZVS two-inductor current-fed isolated DC-DC converter. Detailed small signal analysis was presented while taking into account the effect of auxiliary clamp circuit [11] for ZVS. The series inductor current state variable was discontinuous (assuming high magnetizing inductance) and therefore, was omitted in the analysis. ...

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Section: Frequency Response Curves and Simulation Resultsmentioning

confidence: 99%

Small Signal Modeling and Closed Loop Control Design of ZVS Current-fed Half-Bridge L-L Type Dc/Dc Converter with Active-Clamp

Rathore¹,

Bhat²,

Oruganti³

2010

IJCEE

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“…Many solutions have been proposed to improve the closed-loop performance by using advanced control algorithms, such as deadbeat controllers [14], [15], predictive controllers [16], [17], sliding mode controllers [18], [19], and adaptive controllers [20]- [21], which guarantee closed-loop stability without considering the input constraints of the converter. Recently, in [22], a novel current controller that considered the parameter uncertainties was developed.…”

Section: Introductionmentioning

confidence: 99%

Input-Constrained Current Controller for DC/DC Boost Converter

Choi¹,

Kim²,

Kim³

et al. 2016

Journal of Power Electronics

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This paper presents a simple input-constrained current controller for a DC/DC boost converter with stability analysis that considers the nonlinearity of the converter model. The proposed controller is designed to satisfy the inherent input constraints of the converter under a physically reasonable assumption, which is the first contribution of this paper. The second contribution is providing a rigorous proof of the proposed control law, which keeps the closed-loop system along with the internal dynamics stable. The performance of the proposed controller is demonstrated through an experiment employing a 20-kW DC/DC boost converter.

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“…In the low-to medium power application, when the price of the controller cannot be compensated by the performance, the major drawback is the sample and hold time considered as delay introduced by a digital controller, which is minimized by high sampling frequency. Recent publications [6][7][8][9][10][11][12] demonstrate that purely digitally controlled PFCs are feasible and exhibit a number of benefits such as flexibility and programmability, decreased number of active and passive components, and, as a consequence, improved reliability, negligible and or compensatable offsets and thermal drifts. Additionally, digital control offers the potential of implementing sophisticated adaptive and nonlinear control methods to improve stationary and dynamic performance and to implement power management strategies to improve efficiency.…”

Section: Introductionmentioning

confidence: 99%