A New Isolated Auxiliary Current Pump Module for Load Transient Mitigation of Isolated/Nonisolated Step-Up/Step-Down DC–DC Converter
TL;DR: In this paper, a new isolated auxiliary current pump module (ACPM) is proposed to improve the dynamic response of dc-dc converters under load transients, which can be used as a generic auxiliary module for both isolated and non-isolated step-up/step-down dc-DC converters.
Abstract: This paper presents a new isolated auxiliary current pump module (ACPM), to improve the dynamic response of dc–dc converters under load transients. The developed isolated ACPM can be used as a generic auxiliary module for both isolated and nonisolated step-up/step-down dc–dc converters. The isolated ACPM is a low-power bidirectional converter, designed with higher bandwidth and operates only during the load transients. The performance of the developed auxiliary power converter has been evaluated in conjunction with an interleaved boost converter as main converter, which suffers from poor dynamic performance due to inherent right half plane zero effect. A suitable control scheme is designed and implemented for interleaved boost converter operating in conjunction with proposed isolated ACPM. Load current injection circuit employed in the proposed control scheme eliminates the requirement of complex nonlinear control algorithms. The proposed control scheme in particular suits for current-mode controlled converters operating along with isolated ACPM. Experimental results for a 250-W 100-kHz interleaved boost converter prototype with ACPM are presented. The peak overshoot/undershoot and the transient recovery time are reduced significantly with the incorporation of developed isolated ACPM.
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26 citations
TL;DR: In this article, a 4H-SiC-based electrostatic discharge (ESD) protection circuit with a new structure that has low on-resistance and good high-temperature characteristics while improving the high triggering voltage by applying an improved floating technology to the 4HSiC grounded-gate n-type metal-oxide-semiconductor (GGNMOS) for 70-V applications.
Abstract: In this letter, we propose a 4H-SiC-based electrostatic discharge (ESD) protection circuitwith a new structure that has low on-resistance and good high-temperature characteristics while improving the high triggering voltage by applying an improved floating technology to the 4H-SiC grounded-gate n-type metal–oxide–semiconductor (GGNMOS) for 70-V applications. Electrical characteristics of the 4H-SiC-based conventional GGNMOS, floating-body NMOS, and the proposed ESD protection circuit were compared and analyzed using the transmission-line pulse test. To verify the high-temperature characteristics of the proposed 4H-SiC-based ESD protection circuit, its thermal reliability was measured at high temperatures (300–500 K).
23 citations
Cites background from "A New Isolated Auxiliary Current Pu..."
...voltage power supplies of 70 V are widely used for industrial control, automotive, and space power supply modules [10]....
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TL;DR: A proportionate power sharing among the parallel inverters operating in an islanded microgrid is achieved using droop and virtual inductance control and the proposed decentralised droop control and DC link voltage restoration methods are validated through detailed simulation and experimental studies.
Abstract: In this study, a proportionate power sharing among the parallel inverters operating in an islanded microgrid is achieved using droop and virtual inductance control. The same droop coefficients are used to achieve the frequency regulation as well. The frequency changes which are inevitable in droop control are measured and used to emulate the behaviour of damping and inertia to the DC link voltage using hybrid energy storage system consisting of battery and supercapacitor units. The proposed DC link voltage regulator restores the DC link voltage quickly by providing power corresponding to the rate of change of frequency and frequency deviation. This reduces the impact of voltage variations on the DC-load and keeps modulation index within the linear range for voltage source inverter. The design aspects of DC link voltage regulator, damping and inertia constants, selection of battery and supercapacitor units based on rating of the DC link voltage are discussed. The proposed decentralised droop control and DC link voltage restoration methods are validated through detailed simulation and experimental studies.
15 citations
TL;DR: A new Triple-Mode Active-Passive Parallel Intermediate Links (TM-A2P-IL) converter is proposed in the paper and provides a high voltage gain without using a transformer, voltage multiplier stages, coupled inductor, switched inductor/capacitor circuitry.
Abstract: A high number of research work is being carried out in the field of DC-DC converters to improve the performance of microgrid operation. The DC microgrid has a high level of acceptance because of the integration of renewable energy sources. In DC Microgrid, there is a need for improved DC-DC converter topologies which offer high gain, small size, enhanced efficiency, reduced voltage stress and reduced component count etc. A new Triple-Mode Active-Passive Parallel Intermediate Links (TM-A2P-IL) converter is proposed in the paper. The A2P-IL is designed by a combination of an inductor, capacitor, diode, and control switch. The proposed converter is derived by inserting A2P-IL in conventional boost converter. The proposed TM-A2P-IL converter operates in three modes and provides a high voltage gain without using a transformer, voltage multiplier stages, coupled inductor, switched inductor/capacitor circuitry. The other benefits of the proposed TM-A2P-IL converters are flexibility in the selection of duty cycles, reduced voltage stress of devices, small reactive components, single-stage power conversion. The proposed converter circuit, operating principle, steady-state analysis is studied for both CCM and DCM, discussed. The comparison between available similar type converters and the proposed converter is provided. The operation and performance of the proposed A2P-IL converter are validated through simulation and experimental work.
14 citations
Cites background from "A New Isolated Auxiliary Current Pu..."
...The DC-DC converters can be classified into isolated and non-isolated converters [5]....
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20 Mar 2016
TL;DR: A new control scheme for a single-phase PWM rectifier with Auxiliary Current Injection Circuit (ACIC) to improve the load transient response and DC bus voltage controller bandwidth and to validate the performance of proposed controller.
Abstract: This paper presents a new control scheme for a single-phase PWM rectifier with Auxiliary Current Injection Circuit (ACIC) to improve the load transient response and DC bus voltage controller bandwidth. The PWM rectifier and ACIC are controlled to mitigate the 2nd harmonic ripple in the DC bus under steady-state as well as the peak undershoot and overshoot during load transients. Analytical equations governing the operation of the single phase PWM rectifier with proposed ACIC controller are derived and presented. The proposed controller is designed and simulated using MATLAB Simulink and implemented on a 100 W test setup. The simulation and experimental results are presented to validate the performance of proposed controller.
6 citations
Cites background from "A New Isolated Auxiliary Current Pu..."
...Because of the ACIC controller action the DC bus controller (Gvdc) does not generate appropriate grid current reference during transients [13]- [14]....
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...The objectives of the proposed control scheme are two-fold: firstly to mitigate the 2 harmonic ripple in the DC bus and secondly to inject or absorb the required current during load transient to suppress the disturbances at the DC bus voltage [13]- [14]....
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References
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Book•
31 Jul 1997
TL;DR: Converters in Equilibrium, Steady-State Equivalent Circuit Modeling, Losses, and Efficiency, and Power and Harmonics in Nonsinusoidal Systems.
Abstract: Preface. 1. Introduction. I: Converters in Equilibrium. 2. Principles of Steady State Converter Analysis. 3. Steady-State Equivalent Circuit Modeling, Losses, and Efficiency. 4. Switch Realization. 5. The Discontinuous Conduction Mode. 6. Converter Circuits. II: Converter Dynamics and Control. 7. AC Equivalent Circuit Modeling. 8. Converter Transfer Functions. 9. Controller Design. 10. Input Filter Design. 11. AC and DC Equivalent Circuit Modeling of the Discontinuous Conduction Mode. 12. Current Programmed Control. III: Magnetics. 13. Basic Magnetics Theory. 14. Inductor Design. 15. Transformer Design. IV: Modern Rectifiers and Power System Harmonics. 16. Power and Harmonics in Nonsinusoidal Systems. 17. Line-Commutated Rectifiers. 18. Pulse-Width Modulated Rectifiers. V: Resonant Converters. 19. Resonant Conversion. 20. Soft Switching. Appendices: A. RMS Values of Commonly-Observed Converter Waveforms. B. Simulation of Converters. C. Middlebrook's Extra Element Theorem. D. Magnetics Design Tables. Index.
6,136 citations
24 Jun 1991
TL;DR: In this article, a large-signal nonlinear control technique is proposed to control the duty-ratio d of a switch such that in each cycle the average value of a switched variable of the switching converter is exactly equal to or proportional to the control reference in the steady-state or in a transient.
Abstract: A new large-signal nonlinear control technique is proposed to control the duty-ratio d of a switch such that in each cycle the average value of a switched variable of the switching converter is exactly equal to or proportional to the control reference in the steady-state or in a transient. One-cycle control rejects power source perturbations in one switching cycle; the average value of the switched variable follows the dynamic reference in one switching cycle; and the controller corrects switching errors in one switching cycle. There is no steady-state error nor dynamic error between the control reference and the average value of the switched variable. Experiments with a constant frequency buck converter have demonstrated the robustness of the control method and verified the theoretical predictions. This new control method is very general and applicable to all types of pulse-width-modulated, resonant-based, or soft-switched switching converters for either voltage or current control in continuous or discontinuous conduction mode. Furthermore, it can be used to control any physical variable or abstract signal that is in the form of a switched variable or can be converted to the form of a switched variable. >
691 citations
"A New Isolated Auxiliary Current Pu..." refers background in this paper
...Several complex control techniques to improve the dynamic performance of dc–dc converters have been reported in the literature [5]–[12]....
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01 Jan 1990
TL;DR: Average current mode control may be used effectively to control currents other than inductor current, allowing a much broader range of topological application.
Abstract: Current mode control as usually implemented in switching power supplies actually senses and controls peak inductor current. This gives rise to many serious problems, including poor noise immunity, a need for slope compensation, and peak-to-average current errors which the inherently low current loop gain cannot correct. Average current mode control eliminates these problems and may be used effectively to control currents other than inductor current, allowing a much broader range of topological application.
611 citations
"A New Isolated Auxiliary Current Pu..." refers background in this paper
...achieving higher bandwidths when compared to voltage mode control [28]–[32]....
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TL;DR: In this article, the authors presented the control strategy and power management for an integrated three-port converter, which interfaces one solar input port, one bidirectional battery port, and an isolated output port.
Abstract: This paper presents the control strategy and power management for an integrated three-port converter, which interfaces one solar input port, one bidirectional battery port, and an isolated output port. Multimode operations and multiloop designs are vital for such multiport converters. However, control design is difficult for a multiport converter to achieve multifunctional power management because of various cross-coupled control loops. Since there are various modes of operation, it is challenging to define different modes and to further implement autonomous mode transition based on the energy state of the three power ports. A competitive method is used to realize smooth and seamless mode transition. Multiport converter has plenty of interacting control loops due to integrated power trains. It is difficult to design close-loop controls without proper decoupling method. A detailed approach is provided utilizing state-space averaging method to obtain the converter model under different modes of operation, and then a decoupling network is introduced to allow separate controller designs. Simulation and experimental results verify the converter control design and power management during various operational modes.
364 citations
"A New Isolated Auxiliary Current Pu..." refers methods in this paper
...A multiport isolated dc–dc converter used for regulating the load bus in a satellite is reported in [22]....
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TL;DR: In this paper, a small-signal model for the average current-mode control method is developed, which is suitable for applications where the average inductor current needs to be controlled, as in power factor correction circuits and battery charger dischargers.
Abstract: A recently proposed average current-mode control method is analyzed. A complete small-signal model for the control scheme is developed. The model is accurate up to half the switching frequency. This control scheme is suitable for applications where the average inductor current needs to be controlled, as in power factor correction circuits and battery charger dischargers. The subharmonic oscillation, commonly found in peak current-mode control, also exists in this method. This subharmonic oscillation can be eliminated by properly choosing the proper gain of the compensation network in the current loop. Model predictions are confirmed experimentally. >
347 citations