ZVS Resonant Converter With Parallel–Series Transformer Connection
ABSTRACT A new series resonant converter with a parallel-series transformer connection is proposed in order to achieve zero voltage switching (ZVS) for all power switching, zero current switching (ZCS) for rectifier diodes at a full load, and less transformer secondary winding with a full-wave rectifier. For high-output-voltage applications, the primary windings of two transformers are connected in parallel in order to share the input current and reduce the root-mean-square rms current on the primary windings such that the copper losses on the transformers are reduced. The secondary windings of the two transformers are connected in series in order to ensure that the primary side currents are balanced and the secondary winding turns are also reduced. Thus, the sizes of the transformer core and bobbin are reduced. The full-wave diode rectifier is used on the output side. Thus, the voltage stress of the rectifier diode is equal to the output voltage rather than being two times the output voltage as that in a center-tapped rectifier topology. Based on the resonant behavior, all switches are turned on at the ZVS, and the rectifier diodes are turned off at the ZCS if the operating switching frequency is less than the series resonant frequency. The laboratory experiments with a 660-W prototype, verifying the effectiveness of the proposed converter, are described.
- [Show abstract] [Hide abstract]
ABSTRACT: This work presents an automated design procedure for series parallel resonant converters (LCC) employed in electrostatic precipitator (ESP) power supplies, which reduces the designer effort significantly. The requirements for the power supplies in ESP applications and means to derive an accurate mathematical model of the LCC converter, such as the power loss from commercial insulated-gate bipolar transistors, are described in detail in this paper. The converter parameters, such as resonant tank elements, are selected in order to improve the overall efficiency of the system, when a typical ESP energization operation range is considered. The analysis comprises two different control strategies: the conventional variable frequency control and the dual control. Both control strategies are analyzed by comparing semiconductor losses of five commercial modules. Finally, the circuit operation and design are verified with a 60 kW LCC resonant converter test setup.IEEE Transactions on Industrial Electronics 11/2013; 60(11):4805-4819. · 6.50 Impact Factor
- [Show abstract] [Hide abstract]
ABSTRACT: New phase-shift pulse width modulation (PWM) converters with a wide zero voltage switching (ZVS) range for the slim sustain power module of over 63-in plasma display panel (PDP) are proposed in this paper. Each proposed converter is composed of two symmetric half-bridge converters (TSHBCs) that are placed in parallel on the primary side and are driven in a phase shifting manner. Two power transformers are connected in series on the secondary side. All the switches in the proposed converters can be turned on with ZVS under all load conditions, while the conduction loss caused by the assistant current source extending the ZVS range can be minimized. Moreover, because the turns ratio of the transformers can be designed to be better than that of the counterparts, the voltage stress across the secondary rectifier diode and the primary conduction loss can be reduced. A low-profile design is also achieved due to the use of the two small-sized transformers, which results in a slim power supply. In this paper, the circuit configurations, operation principle, relevant analysis results, and design example of the proposed converters are presented. Experimental results demonstrate that the proposed converters can achieve a significant improvement in the efficiency for a prototype converter realized with the specification of 80-in PDP sustain power module (320-385 Vdc input, 205 Vdc/5 A output).IEEE Transactions on Power Electronics 01/2013; 28(2):945-958. · 4.08 Impact Factor
Conference Paper: Analysis of a new soft switching converter with three resonant tanks[Show abstract] [Hide abstract]
ABSTRACT: This paper presents a new zero-voltage switching (ZVS) DC/DC converter with three resonant tanks for high input voltage and high load current applications. Two series half-bridge legs and two split capacitors in order to limit the voltage stress of active switches at a half of input voltage. These resonant circuits are operated by an interleaved PWM scheme. The output sides of these resonant circuits are connected in parallel to evenly distribute the input power, lessen current stresses on rectifier diodes and reduce copper losses of transformers. The ZVS turn-on through power switches and zero-current switching (ZCS) turn-off for rectifier diodes are accomplished through three series resonant tanks. Therefore, switching losses of MOSFETs and reverse recovery problem of rectifier diodes are reduced. The primary windings of two transformers are series-connected to balance the secondary winding currents. Finally, experiments based on a scale-down prototype are provided to verify the performance of the proposed converter.Power Electronics and Drive Systems (PEDS), 2013 IEEE 10th International Conference on; 01/2013