Push-pull Converter Topology Research Articles

Non-Ideal Push–Pull Converter Model: Trade-Off between Complexity and Practical Feasibility in Terms of Topology, Power and Operating Frequency

Power converters are the basic elements of any power electronics system in many areas and applications. Among them, the push–pull converter topology is one of the most widespread due to its high efficiency, versatility, galvanic isolation, reduced number of switching devices and the possibility of implementing high conversion ratios with respect to non-isolated topologies. Optimal design and control requires very accurate models that consider all the non-idealities associated with the actual converter. However, this leads to the use of high-order models, which are impractical for the design of model-based controllers in real-time applications. To obtain a trade-off model that combines the criteria of simplicity and accuracy, it is appropriate to assess whether it is necessary to consider all non-idealities to accurately model the dynamic response of the converter. For this purpose, this paper proposes a methodology based on a sensitivity analysis that allows quantifying the impact of each non-ideality on the converter behaviour response as a function of the converter topology, power and frequency. As a result of the study, practical models that combine the trade-off between precision and simplicity are obtained. The behaviour of the simplified models for each topology was evaluated and validated by simulation against the most complete and accurate non-ideal model found in the literature. The results have been excellent, with an error rate of less than 5% in all cases.

Analysis and Design of Series LC Partial-Resonance-Pulse-Based ZCS Current-Fed Push-Pull Converter

This article analyzes a partial-resonance-pulse, created through a series LC resonant circuit, on the current-fed push-pull converter topology to achieve the zero-current-switching (ZCS) of the semiconductor switches. During switching overlap of the semiconductor switches, referred to as energy storage mode, the resonance occurs and offers the natural commutation of the semiconductor devices. During this period, the current is smoothly transferred from one switch to the other and the outgoing switch commutates naturally with ZCS. It solves the historical problem of the voltage spike across the devices at their turn-off and thus, eliminates the requirements of the snubber across switches or the clamping circuit. This reduces the hardware complexity and makes the converter snubberless, compact, and cost-effective. The variable frequency with constant switching overlap time is adopted for the load voltage regulation and to maintain the ZCS of the devices for a given range of source voltage and load current. A comprehensive study of the steady-state operation and analysis of the proposed topology is reported along with the design and selection of the resonant tank elements. A hardware proof-of-concept prototype rated at 500 W is developed and tested to validate the analysis and claims and demonstrate the converter performance. An efficiency of 96.2% is recorded in a laboratory on the prototype at full load.

A Gliding Arc Microreactor Power Supply System Based on Push–Pull Converter Topology

The era of evolution in power electronic systems has led to a widespread displacement of power supplies operating at mains frequencies. Switched-mode power inverters offer possibilities incomparably higher than mains transformers. These trends have also entered into plasma technologies, including GlidArc plasma processing. The article presents the use of an inverter power supply for a miniaturized GlidArc. It is a demonstration of using a push–pull topology in an unusual application. A special part is devoted to parasitic phenomena in the inverter and the implementation of switching overvoltages as a way of improving the ignition parameters of the power supply. The results of the tests with a plasma reactor in air conditions as a process gas are also presented.

Practical Battery Discharge Regulator with Weinberg Topology

BDR (battery discharge regulator) required to keep battery voltage within acceptable limits and improve life of the battery. A converters with greater reliability, high power density, tolerance to any fault, are needed for BDR in space craft power supply. Weinberg converter topology is suitable meet this specification. This topology can be treated as a modified push-pull converter topology with coupled inductor. Use of coupled inductor makes output current of converter is continuous, which reduces the output filter capacitors requirement. In this, working of converter and its main features are explained and also practically implemented the converter and its results are analyzed.

Practical Battery Discharge Regulator with Weinberg Topology

A BDR (battery discharge regulator) required to keep battery voltage within acceptable limits and improve life of the battery. A converters with greater reliability, high power density, tolerance to any fault, are needed for BDR in space craft power supply. Weinberg converter topology is suitable meet this specification. This topology can be treated as a modified push-pull converter topology with coupled inductor. Use of coupled inductor makes output current of converter is continuous, which reduces the output filter capacitors requirement. In this, working of converter and its main features are explained and also practically implemented the converter and its results are analyzed.

Removal of electrocardiogram distortion in portable high-power medical device

In this study, we propose a method to remove bio-signal distortions generated when the power is at transient condition in a high-powered portable medical device. To verify the method, three units were designed that consists of a main control unit, bio-signal measurement unit, and power unit. Also, each units were separated with galvanic isolation. For stable operation at the surge condition, the power unit was composed using push-pull converter topology. The design has been examined in both transient and steady state of the operating conditions. The experiment result shows that galvanic isolation between each units was efficient in high-powered potable medical device.

Analysis and design of a current-fed zero-voltage-switching and zero-current-switching CL-resonant push–pull dc–dc converter

A current-fed zero-voltage-switching (ZVS) and zero-current-switching (ZCS) CL-resonant push-pull DC-DC converter is presented in this paper. The proposed push-pull converter topology is suitable for unregulated low-voltage to high-voltage power conversion with low ripple input current. The resonant frequency of both capacitor and inductor is operated at approximately twice the main switching frequency. In this topology, the main switch is operated under ZVS because of the commutation of the transformer magnetising current and the parasitic drain-source capacitance. Because of the leakage inductance of the transformer and the resonant capacitance from the resonant circuit, both the main switch and output rectifier are operated by implementing ZCS. The operation and performance of the proposed converter has been verified on a 400-W prototype.

DESIGN AND IMPLEMENTATION OF LCL-RESONANT PUSH–PULL DC–DC CONVERTER USING PWM CONTROLLER FOR AEROSPACE APPLICATION

The push–pull converter topology is suitable for unregulated low-voltage to high-voltage power conversion, as in battery-poweredsystems where input currents can exceed input voltages by an orderof magnitude.

Design and Implementation of LCL-Resonant Push-Pull DC-DC Converter Using PWM Controller for Aerospace Application

The push-pull converter topology is suitable for unregulated low-voltage to high-voltage power conversion, as in battery-powered systems where input currents can exceed input voltages by an order of magnitude. The resonant circuit operates at twice the switching frequency allowing for small resonant components. The MOSFET primary switches operate under zero voltage switching (ZVS) conditions, due to commutation of the transformer magnetizing current and the snubbing effect of the inherent drain-source capacitance. Output rectifier turn-off is effectively snubbed by the resonant capacitor. An analytical study on ZVS LCL-resonant push—pull DC—DC converter is presented in detail. Closed loop controlled ZVS LCL-resonant push—pull DC—DC converter using PWM controller is implemented. Circuit simulation and experimental results of both open loop and closed loop operations are presented. The software package PSPICE A/D is used for simulation.