Abstract
Dead time between the complementary driving signals is needed to avoid short circuit in voltage source inverters (VSIs), however, this raises issues such as voltage distortion and harmonic generation. In wireless power transfer (WPT) systems, the ratio of dead time versus operating period becomes more problematic due to the high frequency, where the dead time can cause serious concerns regarding the phase errors and control performance deterioration. Therefore, this paper presents a comprehensive analysis of the dead-time effect for WPT systems based on a series–series (SS) topology. Firstly, it is found that voltage distortion appears in two regions in comparison with the three in one active bridge WPT system, and seven regions, as compared to the eight in dual active bridge (DAB) WPT system. Afterwards, a novel pulse width modulation (PWM) method is proposed, where the driving signals of the same phase leg are no longer complementary to each other. By employing the proposed method, the dead-time effect can be addressed up to a certain extent, and the desired voltage can be obtained in all the regions. In addition, the proposed method is not influenced by the system parameters, and can be easily applied to other high-frequency resonant converters. Simulated and experimental results are added to verify the feasibility and efficacy of the proposed control scheme.
Highlights
Wireless power transfer (WPT) system can realize the power conversion by coupling coils through a magnetic field
A novel dead-time elimination method is proposed in the dual active bridge (DAB) wireless power transfer (WPT) system whose dead-time effect should be the most complex
Primary active bridge and secondary diode bridge are adopted in most WPT systems, that is, only four diodes are used on the receiver side
Summary
Wireless power transfer (WPT) system can realize the power conversion by coupling coils through a magnetic field. In the high-frequency WPT systems, the ratio of the dead time versus operating period becomes more significant, and dead-time effect can cause issues, such as voltage distortion, phase errors, harmonic generation, and control performance deterioration. By employing proper utilization of freewheeling diodes, part of the driving signals can be turned off in advance Based on this characteristic, a novel dead-time elimination method is proposed in the DAB WPT system whose dead-time effect should be the most complex. This paper has the following significant merits: Firstly, the proposed technique provides suitable guidelines for control signal configuration of WPT systems and effectively contributes in producing the desired voltage without phase errors in all operating regions of the WPT systems, which further leads to the realization of flexible power conversion.
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