Article

A Comprehensive Analysis of Current-Mode Control for DCM Buck-Boost Converters

Lockheed Martin, Moorestown, NJ, USA
IEEE Transactions on Industrial Electronics (Impact Factor: 6.5). 07/2004; 51(3):733 - 735. DOI: 10.1109/TIE.2004.825204
Source: IEEE Xplore

ABSTRACT

Comprehensive analyses for the buck-boost, pulse width modulation DC/DC converters applying peak current current-mode control are given. The analysis provides closed-form solutions for steady-state output, small-signal loop gain, and conducted susceptibility. It also proves that the state-space averaged model developed for converter using a single-loop voltage-mode control is valid for a current-mode-controlled converter.

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    • "Digital Object Identifier 10.1109/TIE.2011.2134056 in a buck–boost converter are classified in two, incomplete inductor supply mode (IISMs) and complete inductor supply mode (CISM), where IISM possesses two continuous conduction mode (CCM) and discontinuous conduction mode (DCM) operational modes and CISM possesses just one CCM. The operation of dc–dc converters have been generally investigated in two, CCM and DCM, from the operation-mode point of view [12], [13]. Since the dc–dc converters are mostly used in distributed generation systems and energy storage sources, then the magnitude of output voltage ripple (OVR) is one of the most important parameters in a dc–dc converter. "
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    ABSTRACT: This paper investigates the buck-boost dc-dc con- verter and the energy transmission techniques in this kind of converter. In this paper, the critical inductance between the contin- uous conduction and discontinuous conduction modes are deter- mined. In addition, the critical inductance equation between the complete inductor supply mode and incomplete inductor supply mode are calculated. The energy transmission technique and the output voltage ripple (OVR) of a buck-boost converter are ana- lyzed in a specific range of the load and input voltage. The relations between the maximum OVR (MOVR) and the converter compo- nent parameters are deduced, and the minimum inductance value is calculated to ensure the MOVR minimization. Experimental and simulation results are used to prove the validity of the presented theoretical subjects.
    Full-text · Article · Jan 2012 · IEEE Transactions on Industrial Electronics
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    • "The control techniques, which are generally implemented through pulsewidth modulation (PWM), can be classified into voltage mode control or current mode control. The current mode control has a definite advantage over the voltage mode control in that the system response to disturbances is much faster [18]. However, both techniques have problems of inherent instability and subharmonic oscillations when they operate under constant frequency PWM scheme, and a compensator network is usually required. "
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    ABSTRACT: A new switching control algorithm based on state trajectory approximation is proposed to regulate the output voltage of a representative second-order DC-DC converter - the boost converter. The essence of the proposed algorithm is to trap the system into a stable limit cycle while ensuring the required voltage regulation. Unlike some of the earlier algorithms, the concept is applicable to both continuous and discontinuous current modes of operation, making it viable over a wide operating range under various load and line disturbances. A hybrid-automaton representation of the converter is used to perform the analysis, and the control problem is simplified to a guard-selection problem. Guard conditions, governing the transition of the converter operation from one discrete state to the other in a hybrid-automaton representation, are derived. The hybrid-automaton-based control system is implemented by using the state flow chart feature of MATLAB, and extensive simulations are carried out to check the suitability of the algorithm. The hybrid control law is also validated in real time by using a laboratory prototype. The experimental and simulation results prove the effectiveness of the proposed control law under varying line and load conditions.
    Preview · Article · Jul 2008 · IEEE Transactions on Industrial Electronics
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