A Novel Scheme for Sliding-Mode Control of DC-DC Converters with a Constant Frequency Based on the Averaging Model

In this research, a combined adaptive-robust current controller is developed for non-minimum-phase DC-DC converters in a wide range of operations. In the proposed nonlinear controller, load resistance, input voltage and zero interval of the inductor current are estimated using developed adaptation rules and knowing the operating mode of the converter for the closed-loop control is not required; hence, a single controller can be employed for a wide load and line changes in discontinuous and continuous conduction operations. Using the TMS320F2810 digital signal processor, the experimental response of the proposed controller is presented in different operating points of the buck/boost converter. During transition between different modes of the converter, the developed controller has a better dynamic response compared with previously reported adaptive nonlinear approach. Moreover, output voltage steady-state error is zero in different conditions.

Section: Introductionmentioning

confidence: 99%

Lyapunov Based Adaptive-Robust Control of the Non-Minimum phase DC-DC Converters Using Input-Output Linearization

Salimi¹,

Zakipour²

2015

“…The controller can enforce the system state to remain near the sliding plane by proper operation of the converter switch. To make the system state move toward the switching surface, it is necessary and sufficient that [24]- [26]:…”

Section: A Selection Of Control Parametersmentioning

confidence: 99%

Sliding Mode Control for Current Distribution Control in Paralleled Positive Output Elementary Super Lift Luo Converters

Kumar¹,

Jeevananthan²

2011

This paper presents a Current Distribution Control design for Paralleled Positive Output Elementary Super Lift Luo Converters (PPOESLLCs) operated in Continuous Conduction Mode using a Sliding Mode Controller (SMC). Manipulating the higher current requirement of the load through the paralleling of POESLLCs, results in a current inequality. This is mainly due to dissimilarities in the power semiconductor switches and circuit components used in POESLLCs, which may lead to converter failures. In order to balance the proper load current sharing and the load voltage regulation of PPOESLLCs, a SMC is developed. The SMC is designed for the inherently variable-structured of POESLLCs by using the state-space average based model. The static and dynamic performance of the developed controller with PPOESLLCs is validated for its robustness to perform over a wide range of operating conditions through both a laboratory prototype and MatLab/Simulink models, which are compared with a ProportionalIntegral (PI) controller. Theoretical analysis, simulation and experimental results are presented to demonstrate the feasibility of the developed SMC along with the complete design procedure.

“…On the other hand, applying sliding mode control technique to multi-quadrant buck converters has some disadvantages such as: a non-constant switching frequency and the presence of a steady state regulation error [5], [12]. Nevertheless, pulse-width-modulation (PWM) [6], [13], and adaptive feed-forward and feedback hysteresis band control [11] were suggested to achieve a fixed switching frequency. A single or double integral sliding surface method was proposed to improve the steady state regulation error [7], [14], [15].…”

Section: Introductionmentioning

confidence: 99%

“…In most literature, the switching surface is selected as a linear function of state variables for simplicity [5], [6]. Therefore, with low dynamic performance in systems like the elimination of steady state errors, the switching surface function is improved by adding single or double PI controllers [7].…”

Section: Introductionmentioning

confidence: 99%

Minimum Time Regulation of DC-DC Converters in Damping Mode with an Optimal Adjusted Sliding Mode Controller

Jafarian¹,

Nazarzadeh²

2012

In this paper, a new development in the time optimal control theory in sliding mode control systems for multi-quadrant buck converters with a variable load is presented. In general, the closed-loop time optimal control system is applied to multi-quadrant buck converters for output regulation, so that an optimal switching surface is obtained. Moreover, an adjusted optimal sliding mode controller is suggested which adjusts the controller parameters to give an optimal switching surface. In addition, a description of the transient response of the closed-loop system is proposed and used to damp any output or input disturbances in minimum time. Numerical simulations and experimental results are employed to demonstrate that the output regulation time and transient performances of dc/dc converters using the proposed technique are improved effectively when compared to the classical sliding mode control method.