Design and implementation of a novel auxiliary network based ZVS DC/DC converter topology with MPWM: an application to electric vehicle battery charging

Abstract

The DC/DC converter stage has a significant role in the on-board electric vehicle (EV) battery charger. This study proposes a zero voltage switching (ZVS) full-bridge DC/DC converter (FBDC) for efficient power conversion with minimal power loss. The simplified auxiliary circuit-based FBDC consolidate the modified pulse width modulation (MPWM) gating technique for DC/DC conversion stage according to battery profile of the EV. The proposed MPWM can minimise the conduction and switching losses in comparison to the previously proposed converter configuration using conventional phase shift modulation (PSM) gating technique. The size of auxiliary inductance required is reduced with MPWM in comparison to conventional FBDC auxiliary inductance with PSM gating technique. Design and implementation of proposed ZVS FBDC with MPWM are discussed for a 500 W, 80 kHz laboratory prototype and experimental results are presented to validate the design and performance of the proposed converter.

A Duty Cycle Controlled ZVS Buck Converter With Voltage Doubler Type Auxiliary Circuit

“…It has a high number of components and the switch undergoes a hard operation. The Research Community has exploited the topology of ZVS along with PWM in auxiliary type circuits for different applications (Kim et al, 2019;Marikkannan et al, 2019;Srivastava et al, 2019;Lin, 2020).…”

Optimal electrical vehicle-to-grid integration: three-phase three-level AC/DC converter with model predictive controller based bidirectional power management scheme

“…Electric vehicles (EVs) are in greater demand, and as a result, effective and cost-effective charging systems are required to both assist their adoption and address the problems associated with their incorporation into the power grid [1]. It is vital to build charging systems that can meet EV needs because existing EV charging systems frequently experience inadequacies, high costs, and long charging times [2]. One of the primary challenges in electric vehicle (EV) charging is the e cient conversion of AC electrical energy supplied by the grid to DC electricity required for charging the EV's battery.…”

A phase‐shift modulated series resonant converter achieving zero‐voltage and zero‐current switching for wide output voltage range battery charging applications

“…However, the secondary-side PWM modulation need an additional active switches and drivers, which increase the system cost and complexity. Constant-frequency ZVZCS phaseshift full-bridge converter with capacitive output filter is used in [33][34][35][36]. The active bridge-leg [33] or passive auxiliary circuit [34][35][36] is to help realize ZVS.…”

“…Constant-frequency ZVZCS phaseshift full-bridge converter with capacitive output filter is used in [33][34][35][36]. The active bridge-leg [33] or passive auxiliary circuit [34][35][36] is to help realize ZVS. However, the auxiliary current introduced a large circulating current into primary switches and a triangular current shape of main transformer leads to a large RMS and peak current due to the discontinuous conduction mode (DCM) operation in whole charging profile.…”

“…The literature improved PSFB converters [7][8][9][10][11], hybrid-type full-bridge converters [12][13][14][15], reducing frequency range LLC [20][21][22][23][24][25][26][27], fixed-frequency LLC [28][29][30][31][32] and ZVZCS converter [34][35][36] have been reported to improve efficiency in wide voltage output for EV charging. However, they suffer from at least one of the disadvantages such as complex magnetic structure and/or complex control, high-cost solution, a small magnetizing inductance leading to increasing conduction loss and large current stress.…”