This article proposes a new Zero-Voltage Switching (ZVS) high step-up DC/DC converter based on built-in transformer for renewable energy applications. The proposed topology utilizes Three-Winding Built-In Transformer (TWBT) to increase the voltage gain, but unlike most coupled-inductor-based DC-DC converters, output voltages can be obtained under lower magnetic turns ratio. In this circuit, wit...

Class E synchronous rectifier regulating the output voltage at a fixed switching frequency is presented, analyzed and experimentally verified. This rectifier is derived from a class E low dv/dt rectifier by replacing a rectifier diode with a controlled switch. The rectifier is driven by a sinusoidal current source, and the output voltage is regulated by vary the conduction time of the controlle...

A general procedure for maintaining soft switching in inductor-less half-bridge piezoelectric transformer (PT) inverter was analyzed by applying the equivalent circuit of the PT device. Soft switching capability of the PT was delineated and detailed guidelines are given for the load and frequency boundaries, voltage transfer function and the output voltage that will keep the operation under ZVS...

A soft switching three-transistor push-pull(TTPP)converter is proposed in this paper. The 3rd transistor is inserted in the primary side of a traditional push-pull converter. Two primitive transistors can achieve zero-voltage-switching (ZVS) easily under a wide load range, the 3rd transistor can also realize zero-voltage-switching assisted by leakage inductance. The rated voltage of the 3rd tra...

This paper presents the analysis of a water pumping system from photovoltaic cells using a currentfed parallel resonant push-pull inverter, for residential applications in rural areas. The structure of the power circuit is particularly simple and robust. It works in a ZVS commutation. Its main features are: one power processing stage, simple control strategy, low harmonic distortion of the load...

This paper proposes a novel interleaved ultra-large gain zero-voltage switching (ZVS) DC–DC converter for renewable energy systems. By using coupled inductor (CI) and built-in transformer (BIT), high-voltage is achieved. The secondary windings of the CIs are connected in series with primary winding BIT inserted voltage multiplier cell (VMC). In such case, proportional to multiplication turn's r...

Conventional switch-mode LED drivers have problems such as poor performance in harmonic distortion, flickering, power factor correction, stresses on the switches, high switching losses, large size, and cost. To resolve these problems, we propose a long-life driver with ability of correction. The proposed system is based integration half-bridge LLC resonant converter two boundary-conducted boost...

This paper proposes an AC/DC single-stage structure by integrating a boost topology and active clamp flyback (ACF) circuit with power-factor-correction (PFC) function. The PFC function can be achieved controlling operated in the discontinuous conduction mode. With coordination of clamping components, resonant technique is obtained zero-voltage-switching (ZVS) achieved. proposed converter combin...

In this paper, a hybrid control strategy is studied and implemented on an Inductive Power Transfer (IPT) system to simultaneously realize zero-voltage switching (ZVS) constant current (CC) voltage (CV) battery charging. A steady-state analysis of pulse frequency modulation was conducted, based the characteristic gain versus frequency, CC CV charging modes were promised. The ZVS inverter obtaine...