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This paper introduces a single-stage battery charger for neighborhood electric vehicles (NEVs) which has the following characteristics: i. operate in continuous-conduction-mode (CCM), ii. include bridgeless operation, iii. realize zero-voltage switching (ZVS) operation for all MOSFETs, iv. provide controlled di/dt turn-off of the output diodes, v. has symmetric operation. The proposed battery charger...
Development of fast charging stations is expected to reduce the charging time required by Electric Vehicles (EVs) and Plug-in Hybrid Electric Vehicles (PHEVs). Fast charging stations require the rectification of the grid AC voltage to a DC voltage while maintaining high power factor (PF) and low total harmonic distortion (THD) on the grid side. Furthermore, the chargers must be able to provide a controllable...
Photovoltaic (PV) system with multi-strings can be efficiently operated since individual maximum power point tracking (MPPT) of each separated panel is performed by converters which are connected to each panel. For the MPPT, it causes continuous switching losses of the converters. This paper proposes new control operating method in multi-string PV system using parallel DC/DC converters and single...
This paper investigates the effects of ringing on the switching losses of wide band-gap (WBG) devices in a phase-leg configuration. An analytical switching loss model considering the parasitic inductance, stray resistance, devices' junction capacitances, and reverse recovery characteristics of the freewheeling diode is derived to identify the switching energy dissipation induced by damping ringing...
This paper provides a comparison of high power semiconductor devices in 5MW-class Permanent Magnet Synchronous Generator (PMSG) Medium Voltage (MV) wind turbines. High power semiconductor devices of IGCT, module type IGBT, press-pack type IGBT, and press-pack type IEGT of both 4.5kV and 6.5kV are considered in this paper. Benchmarking is performed based on neutral point clamped 3-level back-to-back...
The main objective of this paper is to study a seven level multi string converter topology for distributed energy resources based DC-AC conversion system. This paper proposes the Karnaugh mapping technique (which was rarely used in power electronic converters) for modeling the multi string seven level converter. The proposed method can also be extended to ‘n’ level converter. This paper also proposes...
This paper compares the advantages and disadvantages of I-type 5-level inverter and T-type 5-level inverter, involving the conduction loss, commutation path in reactive power and switching loss, especially at high frequency. Based on the analysis, this paper proposes a novel 5-level inverter for solar system, aiming at reducing both the conduction loss and switching loss at high frequency, and solving...
Double pulse tester (DPT) is a widely accepted method to evaluate the switching behavior of power devices. Considering the high switching-speed capability of wide band-gap (WBG) devices, the test results become significantly sensitive to the alignment of voltage and current (V-I) measurement. Also, because of the shoot-through current induced by Cdv/dt, during the switching transient of one device,...
Nine-switch converter is a recently proposed reduced-switch equivalence of the twelve-switch back-to-back converter. The usual expectation is thus for the nine-switch converter to face some switching constraints and hence performance tradeoffs. However, this might not always be the case with an answer only available after performing a thorough analysis. For that, it is the intention now to compare...
A new shoot-through pulse width modulation (PWM) technique for voltage fed quasi-Z-source DC/DC converters is presented. One advantage of the technique is it minimizes switching losses in the converter by minimizing the number of switching commutations of the active devices in the intermediate H-bridge. The duration of the active and shoot-through states are independently controllable, allowing the...
On-chip switched capacitor (SC) converters for multicore microprocessor power delivery have the potential to reduce the overall energy consumption of future multicore microprocessor systems by independently regulating the voltage supply of each core. This paper describes an on-chip SC converter that can be reconfigured between a 2:1 and a 3:2 voltage conversion ratio to support a wide output voltage...
This paper proposes a new phase shedding scheme for interleaved Boost PFC converter to improve the light load efficiency. In the proposed scheme, the power level in the slave channels is reduced linearly as the output loading drops for optimization of light load efficiency. The new scheme also prevents the PFC slaves from switching between the ON and OFF states immediately after phase shedding, thereby...
This paper proposes an improved space vector modulation (SVM) method for the 3-level neutral point clamped (NPC) inverter that serves as a bidirectional power conversion system for renewable energy micro-grid. Conventional SVM for the NPC converter majorly deals with neutral point (NP) balance issue without considering switching loss. The proposed SVM method balances the NP voltage and minimize the...
Common Source Inductance (CSI) is the inductance shared by the main current loop and the gate drive loop in a synchronous buck converter. Any voltage induced on CSI will change the effective gate-source voltage of the FET and has significant impacts on converter performance. This paper will explore and verify the impacts of High Side (HS) CSI on converter switch node ringing and power loss. New equations...
This paper presents a high efficiency, continuous conduction mode (CCM), zero voltage switching (ZVS) bridgeless AC-DC power-factor-correction (PFC) converter for neighborhood electric vehicle (NEV) battery charging. The converter operates in both pulse-width-modulation (PWM) mode and resonant mode each switching cycle and utilizes standard average-current-mode control. This new modulation technique...
This paper presents the design, prototype development, operation and testing of a 1 kW, 800 V output all-SiC boost DC-DC converter using SiC MOSFET and SiC Shottky diode chips. The switching frequency is raised up to as high as 800 kHz and a 230 °C junction temperature has been reached by switching-loss dominant self-heating. High frequency switching characteristics of the proposed converter are evaluated...
It is well known that that source inductance could significantly increase turn-on and turn-off time, and therefore increase switching power loss. Also, it is well understood that switching loop inductance could reduce voltage stress during turn-on and increase voltage stress during turn-off. In this paper, a new inductive switching loss model that includes source inductance and switching loop inductance...
The Dual Active Bridge (DAB) converter with the Conventional Phase-shift Modulation (CPM) and Triangular Current Modulation (TCM) are compared in terms of the power transfer and total loss. It is noted that there exists an optimal design trade off among the switching loss, conduction loss and drive loss according to different load current and switching frequency. Therefore, the optimal switching frequency...
A 12–1 V Gallium Nitride based POL converter demonstrates over 96% efficiency and under 4 ns switching time. This is accomplished through a layout technique that does not require costly microvias but still minimizes parasitic inductance to support fast switching. A single-sided synchronous buck converter phase operates up to 30 A in a 5.6 cm2 (0.87 in2) package that outperforms other commercially...
Eliminating the spurious turn-on in the bridge-leg configuration plays an important role in preventing excessive switching loss, self-oscillation and shoot-through. A passive level-shifter is proposed to superimpose a negative gate voltage to bring down the spurious triggering pulse and thereby avoid the spurious turn-on. The merits of the devised auxiliary circuit lie not only in that it consists...
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