An active-clamping quad-flyback converter is proposed to achieve zero voltage switching (ZVS) for all power switches. The secondary sides of quad-flyback converter are connected in parallel to share the load current. Thus, the transformer copper losses and the conduction losses on the output diodes are reduced. Activeclamping part including one auxiliary switch and one clamp capacitor can relea...

Aiming at the optimization of current stress with low voltage ratio and full ZVS, a control method combining variable duty cycle phase shift was proposed based on dual active bridge (DAB) converters DC blocking capacitors. By adding bias to capacitors, asymmetric modulation (ADM) can adjust as needed. Based theoretical analysis steady-state operation, operating modes be divided into eight modes...

A plug-in hybrid electric vehicles (PHEV) charger adapter consists of an AC/DC power factor correction (PFC) circuit accompanied by a full-bridge isolated DC/DC converter. This paper introduces efficient two-stage topology with improved PFC rectifier as front-end and high-frequency zero voltage switching (ZVS). Current (ZCS) converter is the second part. The chosen bridgeless interleaved (BLIL)...

This paper presents a modified Current Source Parallel Resonant Push-pull Inverter (CSPRPI) for single phase induction heating applications. One of the most important problems associated with current source parallel resonant inverter is to achieve ZVS in transient intervals. This paper shows that the CSPRPI with integral cycle control method has dynamic ZVS. According to this method, it is the ...

This paper presents a technique to generate a complete family of two-switch pulsewidth-modulated (PWM) with active clamping dc/dc converters, featuring soft commutation of the semiconductors at zero-voltage (ZVS). The main purpose of this technique is to integrate these converters under a same theoretical principle to derive the topologies in a comprehensive form and generate new circuits. All ...

DC–DC step-up converters for high-output voltage applications typically demand high voltage devices, leading to high conduction and switching losses. This identified demand has motivated research on active clamping and multi-level topologies. On this context, this study presents the study of a novel DC–DC boost converter with three-level boost-type active clamping, zero-voltage switching (ZVS) ...

This paper presents a new soft switching flyback-forward PWM converter. The proposed circuit employs an auxiliary circuit to achieve soft switching condition for switches and also absorbs the voltage spikes caused by the leakage inductance of transformers in the converter. In the proposed converter main switch operates at ZVS and the auxiliary switch operates at ZCS. The proposed converter has ...

This paper presents a family of soft-switching DC–DC converters with a simple auxiliary circuit consisting of a coupled winding and a pair of auxiliary switch and diode. The auxiliary circuit is activated in a short interval and thus the circulating conduction losses are small. With the auxiliary circuit, zero-voltage-switching (ZVS) and zero-current-switching are achieved for the main and auxi...

The trend in power converters is towards increasing power densities. To achieve this goal, it is necessary to reduce power losses, overall system size, and weight by increasing the switching frequency. High reliability is also very important for today’s switched-mode power supplies (SMPS). The zero-voltage-switching (ZVS) or zero-currentswitching (ZCS) topologies that allow for high-frequency s...

This paper presents a new design of zero-voltage-switching (ZVS) buck converter. This new converter utilizes a coupled inductor to implement the output filter inductor as well as the auxiliary inductor which is commonly employed to realize ZVS for switches. Additional magnetic core for the auxiliary inductor in traditional designs is removed and hence manufacture cost is reduced. Moreover, than...