Single-phase single-stage bidirectional isolated ZVS AC-DC converter with PFC

Abstract

This paper presents a single-phase bidirectional isolated AC-DC converter with Power Factor Correction (PFC) consisting of a half-bridge on the AC side and a full-bridge on the DC side to accomplish single-stage power conversion. The converter applies a new control scheme combining phase-shift and frequency modulation to achieve Zero-Voltage-Switching (ZVS) over the full range of the AC line voltage. Compared to the conventional boost PFC approach, the proposed converter eliminates high frequency harmonic distortions on the mains due to the inherently integrated LC input filter stage. The operating principle in AC-to-DC and DC-to-AC under ZVS conditions by means of analytical considerations are provided. Simulation results and a detailed loss model of a 3.3 kW electric vehicle battery charger to connect to the 230 Vrms / 50 Hz mains considering a battery voltage range of 280 V to 430 V validate the theoretical analysis. The converter can also be used as a submodule in a Cascaded H-Bridge Converter (CHB) for medium or high voltage applications.

Implementation of a low cost ac-dc converter for high and low power applications

“…The rectifier converts ac supply to dc, which is then filtered and fed to a modified multiport converter (MPC).This MPC has a cascaded combination of zeta and a buck converter, that supplies dc load of two different power ratings. Power factor correction is done using zero voltage switching, in an isolated AC-DC converter [1] [5].Current injection method is employed to remove the ripples in tha ac supply. The output voltage ripple helps to generate these current injection pulses, in rectangular form [2].…”

Development of single-switch model for current sensorless control of bidirectional half-bridge AC/DC converter

“…Fig. 2 presents widely spread topologies that enable bidirectional power flow, such as full-bridge ( [17], [18]), halfbridge ( [19], [20]) or multilevel [21] types of converter. They are all relevant on some type of applications, while the halfbridge topology has minimal number of semiconductor switching elements in the current path that has positive influence on converter's operation efficiency.…”

Simple instantaneous power modulation scheme for single-phase high-frequency link microinverter for low-power PV applications

“…1 (c) a more direct HF-Iink conversion scheme is presented, which can perform the energy conversion without the usage of the rectification stage and an intermediate DC-bus, while maintaining the advantages of the high-frequency switching on decreasing system volume. Several single-phase HF-Iink inverters have been proposed in the literature [4]; in this paper a simple instantaneous power modulation scheme is proposed for the HF-link converter topology recently presented in [5].…”

“…The converter in [5] has been previously presented in [6] with variations on the AC side with a full-bridge configuration and with an additional resonant network at the DC side; moreover, the ACIAC converters in [5] and [6] were introduced first in [7]. Furthermore, a phase-shift modulation strategy has been presented in [8] for a direct ACI AC conversion system with full-bridge ACI AC converters at both sides of the isolation transformer, which its fundamental concept can be applied to the DCIAC conversion system presented in this paper.…”

“…Furthermore, a phase-shift modulation strategy has been presented in [8] for a direct ACI AC conversion system with full-bridge ACI AC converters at both sides of the isolation transformer, which its fundamental concept can be applied to the DCIAC conversion system presented in this paper. The modulation scheme proposed in this paper is less complex than the one presented in [5], which involves simultaneous frequency, duty cycle and phase-shift control of the system; and is intended to be implemented in low-cost system such as a DSC that could lead to lower complexity, lower device count and overall cost of the system and therefore increased reliability and market competition.…”