The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Because of low switching losses and wide operation range, series-parallel resonant converter with optimized modulation is attractive. There are three major modeling methods for resonant converters, including approximation method, extended describing function method, and sampled-data method. Approximation method and extended describing function method are simple but relatively inaccurate on heavy load...
Series-parallel resonant converter has a group of advantages when operating with optimized modulation. Pinheiro's original optimized modulation control is convenient for analogue-digital hybrid implementation, not for full digital implementation. A novel, high-dynamic, digital device adapted control method is proposed in this paper. It is called half-cycle sampled discrete control. By simulation and...
The series-parallel resonant converter is one of the most popular topologies among resonant converters. In order to achieve a further reduction of transistor switching losses, an optimized modulation strategy was proposed and implemented full digitally. This yields zero-current switching on one full bridge leg and zero-voltage switching on the other leg. Costs of the optimized modulation are the increased...
In this contribution the frequency-domain modeling techniques for resonant converters under optimized modulation are reviewed. As a general modeling technique, the standard AC fundamental harmonic approach is suitable for all resonant converter topologies. However, it becomes inaccurate if the current or voltage of the resonant tank is distorted from sinusoidal waveform. The extended AC fundamental...
Extended describing function method is one of the commonly applied state-of-the-art methods for dynamical modeling of series-parallel resonant power converters. Thanks to the relative good sinusoidal voltage waveform across the parallel capacitor Cp it has a good modeling accuracy under light and medium load conditions. However, under heavy load condition this method becomes inaccurate due to the...
This paper discusses the modulation methods for ground current suppression. It focuses on the ground current of the grid-connected three-phase transformerless photovoltaic (PV) inverter with unbalanced output filter inductors. The staggered SPWM modulation using three triangular signals displaced by 120 degrees is mentioned for comparison. Aiming at the case of unbalanced output filter inductors,...
In this paper, four types control methods have been proposed for buck-boost cascade topology. This converter used in hybrid electric vehicle can step the battery voltage level either up or down. The target is to find the most appropriate control method for the converter with certain specifications. Critical conduction mode control, fixed frequency control, the buck/boost control and the buck + boost...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.