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.
Resonant converters find widespread application in the industries for Radio Frequency (RF) heating. Various topologies using vacuum tubes are currently used for such application. Realizing class D topologies with solid state devices could provide more reliability. This work explores possibility of developing a 1kW Class D resonant converter for heating applications using Si/SiC MOSFETs which can replace...
This paper explains a procedure on how to select resonant circuit components of a unique direct three-phase to single-phase AC/AC converter for a contactless electric vehicle (EV) charger. The topology has a fewer bi-directional switches than a matrix converter and consists of a resonant circuit to utilize a zero-current switching (ZCS) mechanism. The selection goal was to realize a working prototype...
This paper presents a novel resonant based, high power density power electronics converter solution for mid-feeder voltage regulation of a low voltage (LV) distribution network. Owing to the use of high switching frequency operation and a full soft-switching control strategy, the proposed converter is capable of superimposing LV compensation into the feeder voltage, to achieve a significant system...
Power electronic traction transformer (PETT) is an emerging technology for traction applications. LLC resonant converter is an attractive option for isolated DC/DC stage because of its high efficiency. However, there will be inevitable twice-line frequency ripple on the resonant current due to the singlephase power fluctuation. On the other hand, parameter mismatch between modules can result in power...
The loss contribution of a 2.3 kW synchronous GaN-HEMT boost converter for an input voltage of 250 V and an output voltage of 500 V was analyzed. A simulation model which consists of two parts is introduced. First, a physics-based model is used to determine the switching losses. Then, a system simulation is applied to calculate the losses of the specific elements. This approach allows a fast and accurate...
In this work a demonstrator with a switching frequency up to 2.5 MHz is shown. These comparatively high frequencies reduce the weight and the system costs of the resonant 3-kW-DC-DC-converter. The electrical properties of the implemented Gallium Nitride (GaN) power transistors enable high switching frequencies while maintaining high efficiency. The presented converter has a power density of approximately...
Isolated dc-dc converters are increasingly being used in many industrial and utility applications such as shipboard, hybrid and electric vehicles, microgrids, etc., for integrating the dc sources and storage devices. A modified dual transformer based asymmetrical dual bridged isolated dc-dc (MDT-ADB) converter is proposed in this paper. MDT-ADB consists of three stages: input, isolation, and output...
In this paper, rectification methods for secondary side of LLC DC-DC converter are considered in order to achieve high efficiency and high output power. Firstly, two types of synchronous rectifier methods are compared. One is a Center-Tapped synchronous Rectifier (CTR) and the other is a Current-Doubler synchronous Rectifier (CDR) method. Also, two prototypes of converter are implemented and tested...
A zero current transition (ZCT) approach for T-type 3-level converter is presented in the paper. Through State-Plane analysis of its voltage and current trajectory in 4 operation zones, a design guideline is developed. The proposal is verified in a 10KVA converter, which is a mini-model of 500KVA UPS product. Preliminary test result shows that diode reverse recovery is a big concern for such ZCT soft...
A three-phase dual active bridge (DAB) converter with three-level phase-legs is analyzed, showing an increased soft-switching region and a reduction in rms current in the ac-link for unequal input and output voltages compared to the conventional two-level circuit. Furthermore, a comparison of the semiconductor losses is carried out for different three-level inverter implementations using commercially...
This paper presents a novel control concept for the bidirectional non-inverting buck-boost converter to achieve extreme high-efficiency power conversion. The duty cycle, duty ratios and time delays of the PWM control signals for the switches are modulated depending on operating points to minimize the power losses in the converter. A 3kW prototype of the converter using SiC MOSFETs has been designed...
The class of resonant converters is very attractive due to its ability to achieve nearly lossless switching by using zero current or zero voltage switching (ZCS/ZVS) for the switching devices in the input bridge. Since most switched-mode power supplies (SMPS) today use MOSFETs as semiconductor devices, a ZVS operation is typically preferred. However, the ongoing trend towards higher switching frequencies...
One of the central requirements of a Dual Active Bridge (DAB) converter is to operate under Zero Voltage Switching (ZVS) conditions, to reduce switching losses and increase operating efficiency. This paper shows how frequency domain analysis can be used to design and operate a DAB to ensure ZVS across the entire operating range by using transformers with a reduced winding coupling factor and adaptive...
This paper presents a soft-switching three-phase AC to DC converter isolated by high-frequency transformer. The-soft switching conditions are indicated and the soft-switching control method are derived. The effectiveness of the proposed circuit and control method are verified by experiments using a 1 kW prototype.
A bidirectional DC-DC converter with high voltage gain and wide input and output voltage range is presented. The input voltage range is 30 V to 60 V and the output voltage range is 100 V to 400 V. The nominal power is 10 kW. The converter is based on a Dual Active Bridge in which the voltage range has been extended with a tap changer between the transformer and the high voltage H-bridge.
This paper proposes a soft switching type dc-dc converter. To suppress noise levels, reformed delta-sigma modulation circuit is introduced. To reduce switching loss, the proposed converter also introduces soft switching technique.
In this work we present results of investigations on the usability of ISOPLUS SMPD SiC-MOSFET phase-leg modules for medium-frequency resonant inverters. These modules combine excellent thermal performance, very low parasitic inductances and good switching performance with the benefits of surface-mountable packages. In the first step, a SPICE and a thermal simulation of a half-bridge inverter using...
This paper presents a modification of a test bench which has been built for device characteristation. The test bench is able to measure the static losses (blocking and forward conduction) and the dynamic losses (turn on and turn off). To have a comparison of devices designed for soft-switching applications and devices for converters in hard-switching applications the existing test bench is modified...
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.