An Analysis and Modeling of the Class-E Inverter for ZVS/ZVDS at Any Duty Ratio with High Input Ripple Current

Abstract

This paper presents an analysis and modeling of the class-E inverter for ZVS/ZVDS execution at any duty ratio. The methodology is to determine the input current to the inverter analytically under the assumption that it always remains positive. The latter is ensured by proper selection of the input inductance such that the inverter always operates either in (1) the border condition mode or in (2) the continuous conduction mode regardless of the input ripple. Using this input current and applying the boundary conditions, the required input capacitance for the ZVS/ZVDS execution is determined at a specified input/output voltage, output power and load. The analysis shows that the ZVS/ZVDS can be achieved while the input capacitance is selected appropriately. A comparison between the analytical and simulation results is also formulated involving the proposed and other existing models. The simulation results that are provided at different duty ratios demonstrate that they are in a better agreement with the proposed analytical model regardless of the input inductance and the state of input ripple current. The analytical modeling is facilitated by using MAPLE®.

A Comparative Performance Analysis of Zero Voltage Switching Class E and Selected Enhanced Class E Inverters

“…Replacing the parametric values in (29) and assuming Q L = 7 and replacing f s gives us: Using f s and L s as determined in Equation (30) gives us,…”

“…The analytical models to correctly describe the characteristic behavior of enhanced class E inverters have been investigated in [11,15,[17][18][19][22][23][24][25][26][27][28][29][30][31][32]. Based on the analysis technique, these models can be classified into the waveform equation [11,17,22,24], statespace [15], or frequency domain [25] methods.…”

Photovoltaic Class‐E Inverter for Resonance Wireless Power Transfer for Electric Vehicle Charging Applications with Optimization Algorithms

“…For the RWPT system, we need a resonant power supply signal in MHz, which requires a structure of HF switching. The second part of this article shows the topology of the HF resonant inverter, Class-E, which has been developed thanks to of GaN transistors [32][33][34][35] characterized by fast switching and low conduction resistance (R cin ). This technology allows generation of HF-VHF-UHF signals, with less switching losses and high efficiency (between 89% and >97%) for a fixed distance, compared to other topologies.…”

A Comparative Analysis of Soft Switching Techniques in Reducing the Energy Loss and Improving the Soft Switching Range in Power Converters

“…On the other hand, for the ZCS, the current transients, rather than the voltage, are controlled in order to achieve the same goal. In ZVZCS [16][17][18][19][20][21][22], both voltage and current transients are simultaneously controlled to reduce the crossover at both turn on and turn off instants. This results in a significant improvement in switching losses and, hence, higher efficiency.…”

“…In particular, this is a direct consequence of simultaneous manipulation of both the voltage and the current transients to reduce the crossover losses. However, the existing studies [16][17][18][19][20][21][22] did not explicitly cover this issue or analyze the ZVZCS from this point of view. Hence, considering these factors, it is worth investigating the standing of ZVZCS relative to the other soft switching techniques (i.e., ZVS and ZCS) in terms of loss reduction capability and soft switching range of operation.…”