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Bipolar dc-dc converters, which are widely used in the battery testing equipment, have many advantages such as simple structure, wide range of output voltages and high conversion efficiency. However, the traditional synchronous carrier modulation method leads to a circulating current in the ground wire connected between filtering capacitors and the negative dc input bus. The circulating current results...
In this paper, a high performance fully digital peak current mode controller for DC-DC converters which supports the full duty cycle range from 0–100% is presented. Support for low duty cycle is very important during short circuit or converter overload and support for high duty cycle is important for faster response during a transient and for providing a larger output voltage range. The digital current...
In this paper, a phase shifted full bridge (PSFB) dc-dc converter with secondary synchronous rectifier is implemented using GaN HEMT. The design considerations including PCB layout, optimal dead time for efficiency are described, and prototype hardware is implemented based on analysis results. The experiment is carried out with a 500W prototype, and power efficiency is compared with a conventional...
This paper proposes new step-up DC-DC converters with high ratio capability. The proposed DC-DC converters are derived using combination of boost converters and buck-boost converters. A high ratio capability is achieved by parallel input and series output combination so that the efficiency is better than the one that is achieved by using a conventional boost converter. A method to reduce the input...
The magnetic coupling of filter inductors is widely utilized in various power electronics application fields including dc-dc converters in EV charger system in order to enhance the filtering performance while maintaining the minimal filter size. The optimal distribution of self and mutual inductance of coupled inductor is regarded to be one of important design tasks with respect to the coupled inductor...
A transformerless high step-down DC-DC converter is presented in this paper. The voltage-divider and switched-inductor techniques are employed to achieve high step-down voltage gain for the proposed converter. For the voltage divider, two capacitors with same capacitance are connected to the DC source. For the switched inductor, two inductors with same inductance are in series at the switch ON-period...
In high voltage gain application scenarios, diode-capacitor network can be used to achieve a relatively high voltage gain and at the same time reduce the demand of magnetic component, which considerably improves the efficiency and power density. In this article, the topology of a high step-up DC-DC converter based on multi-cell diode-capacitor network and coupling inductor is proposed to attain a...
An interleaved high step-up dc-dc converter is proposed for high voltage gain and high efficiency applications. The configuration is composed of modified two-phase interleaved boost converter with parallel-input series-output connection and a voltage multiplier module stacking on the output side. In the proposed converter, the parallel-input connection is used to share the input current and to reduce...
The high power density of Supercapacitors (SCs) make them good elements for Hybrid Energy Storage Systems (HESSs). In order to increase the amount of energy of their high power bursts, they should operate with large voltage variations. This paper presents the design equations of a 3-switch bidirectional DC-DC converter with a tapped inductor that can be used for interfacing SCs to DC buses. Some of...
This paper analyzes the impact of converter design elements on the operating performance of DC/DC converters, used worldwide for renewable energy sources. The design of inductor and capacitor elements is made considering the acceptable output ripple of voltage and current. This paper presents the methodology for determining the inductances and capacitances required for DC/DC converter operation within...
In this paper, a non-isolated current fed boost dc-dc converter with coupled inductors is proposed. This converter achieves a high voltage gain ratio with zero-ripple input current. An active snubber circuit is employed to reduce the voltage spike of main switch generated by leakage inductance and realize zero voltage switching at turn-on. The circuit configuration, operation principle and design...
In this paper, power factor corrected novel ac-dc rectifier topologies for 1-ph and 3-ph application are proposed. These converters provide high gain and do input current shaping as well. A mutual inductor is used at the ac side for providing high gain as well as current shaping. The ripple energy of the system is analyzed. The relations between the ripple energy of 1-ph and 3-ph system with power...
In this paper, a Buck-Boost operation in a bidirectional ZVS DC-DC converter is proposed. Initially, the static analysis of the proposed operation is presented, providing fundamental knowledge for a project methodology. Finally, in order to prove the theoretical analyses, simulation results are presented and discussed.
This paper concerns the design of a Solid-State Transformer (SST) based grid integrated battery charger with an isolated bi-directional dc-dc converter to maintain the overall system competitiveness. The proposed full bridge DC-DC converter exploits the shoot through mode in the V2G mode for the boosting purpose, which is the uniqueness of the proposed topology. The inclusion of SST in the design...
There are numerous galvanically isolated current-fed step-up dc-dc converter with soft-switching. Usually, soft-switching is associated with circulating energy that causes additional power losses and duty cycle loss. At the same time, the output voltage is stabilized by means of the shoot-through duty cycle control. However, new control possibilities were enabled in the novel concept of full soft-switching...
In this study, two high frequency transformer designs have been made in order to achieve zero voltage switching (ZVS) condition in a phase-shifted full-bridge inverter for dc-dc converter from 311 V input to 100 V output. One transformer was implemented using conventional winding technique while the second transformer was using interleaved technique. Simulation has shown that the second transformer...
A power converter supplying kilo-watt-power from its output side is developed in this paper. The composition of its power-stage includes an AC-DC converter and a DC-DC converter. The topology used by the DC-DC converter is the phase-shifted full-bridge with parallel current-doubler rectification converter (PSFB-PCDRC). For the sake of feedback controller design, the small-signal model of PSFB-PCDRC...
This paper presents a new scheme of the very high voltage gain quadratic boost converter. The additional advantage of the proposed topology is the continuous input current. The scheme is based on a combination of the quadratic boost converter and switched-coupled-inductor. The study analyses the operation in continuous and discontinuous modes and obtains the basic fundamental relations in steady state...
A small-signal model for the Input-Series Output-Parallel (ISOP) DC-DC converters is developed in this paper. The proposed model is obtained applying the State-Space Averaging technique. The ISOP DC-DC converter consists of multiple DC-DC modules connected in series at the input and in parallel at the output. In this paper, the ISOP DC-DC converters are used in combination with the 5-level unidirectional...
Focus is on a transformer based single-switch galvanically isolated quasi-Z-source converter. Single-switch topologies suit well for low power applications due to low complexity and cost of realization. However, their performance is rather limited, since only one switch should handle all converter power. Input-parallel output-series (IPOS) cascading improves stress of semiconductor devices, reliability,...
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