Input Voltage Sharing Control Scheme for Input Series and Output Parallel Connected DC–DC Converters Based on Peak Current Control

Qu, Lu; Zhang, Donglai; Zhang, Bohan

doi:10.1109/tie.2018.2829691

Cited by 42 publications

(35 citation statements)

References 19 publications

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“…By comparing (18) and (19), it is clear that B is the additional term added by the IVSR, which is only contains linear components. To eliminate B, (20) should be satisfied…”

Section: A Theoretical Analysismentioning

confidence: 99%

“…The proposed IVSR in [19] reduces the overshoot of the output voltage in the dynamic response by adding input current control loops. An IVSR with a peakcurrent control structure uses the sum of the compensation results of the input and output voltages as the rated value for programmed currents to reduce the output voltage disturbance when the DC supply voltage changes significantly [20]. An IVSR with a model predictive control structure improves the system dynamic response by replacing traditional controllers with digital controllers [21].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Novel Voltage Balancing Control Strategy for Dual-Active-Bridge Input-Series-Output-Parallel DC-DC Converters

Luo

Huang

2020

IEEE Access

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This paper proposes a novel input voltage balancing control strategy for dual-active-bridge (DAB) input-series-output-parallel (ISOP) DC-DC converters. The proposed strategy not only aims at balancing the input voltage among modules but also at eliminating the coupling effect between input voltage sharing regulators (IVSR) and output voltage regulators (OVR). Specifically, this paper reveals it is too complicated to design a decoupling control structure that can eliminate the dynamic interference of IVSRs to OVRs by using traditional control strategies. Thus, an intermediate control variable, which was adjusted by the IVSR and OVR to simplify the decoupling control structure design, was introduced to calculate the phaseshift ratio. Furthermore, a new control law was derived, and an expression for the intermediate control variable modification was proposed to achieve decoupling control. Moreover, to complete the discussion, the main transfer functions were deduced and the design procedure was illustrated. Based on the novel control strategy, the interference of an IVSR to an OVR was eliminated, so the two controllers can be independently designed. Finally, both the simulation and experimental results were used to verify the performance of the novel control strategy. INDEX TERMS Dual-active-bridge (DAB) input-series-output-parallel (ISOP) DC-DC converter, decoupling control, dynamic interference, intermediate control variable.

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“…By comparing (18) and (19), it is clear that B is the additional term added by the IVSR, which is only contains linear components. To eliminate B, (20) should be satisfied…”

Section: A Theoretical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Voltage Balancing Control Strategy for Dual-Active-Bridge Input-Series-Output-Parallel DC-DC Converters

Luo

Huang

2020

IEEE Access

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“…The four basic arrangements are: the parallel-input/parallel-output (PIPO), the parallel-input/series-output (PISO), the series-input/parallel-output (SIPO), and the series-input/series-output (SISO). Various dc-dc converter topologies like the buck and buck-based [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19], the boost and boost-based [11,[19][20][21][22][23][24][25][26][27][28][29], and the buck-boost-based [25,[30][31][32] have been used for the constituent modules of modular converters. The semiconductor devices employed in these converters are commonly driven using pulse-width modulation (PWM) techniques with the converter being operated under voltage-mode control (VMC) or current-mode control (CMC) [1, 2, 4, 6-10, 12, 13, 16, 17, 19-26, 31, 32].…”

Section: Introductionmentioning

confidence: 99%

“…An Accurate SS model of PCMC requires the inclusion of the sampling effect of the current loop in its structure. Such a model can be added to the power-stage SS model in two ways: the first can be classified as circuit-oriented where a separate transfer-function block is interfaced with the power-stage model [1,6,7,10,12,19,21,22,26,32], and the second is the state-space algebraic approach where the PCMC law is augmented with the power-stage matrices. The algebraic approach requires more mathematical manipulation but is more general since it allows the CMC converter model to be obtained in symbolic state-space form.…”

Section: Introductionmentioning

confidence: 99%

Small-signal modeling of current-mode controlled modular DC-DC converters using the state-space algebraic approach

Radaydeh¹,

Al-Mothafar²

2020

IJECE

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<p>Small-signal models are useful tools to preliminary understand the dynamics of interconnected systems like modular dc-dc converters which find a wide range of industrial applications. This work proposes a state-space-based averaged small-signal model in symbolic form for a peak current-mode controlled parallel-input/parallel-output buck converter operating in the continuous-conduction mode. In modeling the converter power-stage each module is independently represented. For modeling the current-mode control the state-space algebraic approach is used to incorporate the current-mode control-law into the power-stage equations. For each module two parasitic elements in addition to the current-loop sampling action are included in the derivation. Furthermore, the control-to-output voltage transfer functions are presented in symbolic form for two cases of interest: the first when the converter has two non-identical modules to study the effect of inductor mismatch, and the second when the converter is composed of <em>n</em>-connected identical modules to assess the effect of varying the number of modules. All responses from PSIM cycle-by-cycle simulations are in good agreement with the mathematical model predictions up to half the switching frequency.</p>

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“…The balance among modules can be obtained through a decentralized strategy. It implies in controlling electrical quantities in the modules, which improves the steady-state and dynamics behavior of the converter [17], [18]. However, it normally drives to more complex control strategies, increasing the number of sensors and affecting reliability.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Modular DCM Flyback Converters in Input Parallel Connections with Parametric Mismatches

Fuerback¹,

Dall’Asta²,

Pagliosa³

et al. 2019

Eletrônica de Potência

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This paper analyzes the effects of parameter mismatches in the balance mechanism of modular DC-DC Flyback converters operating in discontinuous conduction mode. The natural current and voltage distributions among modules are evaluated when mismatches on duty cycles, transformer magnetizing inductances and transform turns ratios are present. From these results, the critical values of inductances and duty cycles that assure the discontinuous operation are equated. The smallsignal equivalent circuit for Input-Parallel-Output-Series and Input-Parallel-Output-Parallel connections are found, followed by a simple control strategy. The theoretical analysis is verified by experimental results obtained with a prototype composed of three 200 W Flyback modules, with a rated power of 600 W and maximum efficiency of 95.5%. Results corroborate the proposed equations for the steady state balance and dynamic behavior of both connections, highlighting the modular characteristic of the converter.

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Input Voltage Sharing Control Scheme for Input Series and Output Parallel Connected DC–DC Converters Based on Peak Current Control

Cited by 42 publications

References 19 publications

Novel Voltage Balancing Control Strategy for Dual-Active-Bridge Input-Series-Output-Parallel DC-DC Converters

Novel Voltage Balancing Control Strategy for Dual-Active-Bridge Input-Series-Output-Parallel DC-DC Converters

Small-signal modeling of current-mode controlled modular DC-DC converters using the state-space algebraic approach

Analysis of Modular DCM Flyback Converters in Input Parallel Connections with Parametric Mismatches

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