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A new interleaved forward converter, adopting series-input structure with a common transformer reset circuit, is proposed in this paper. Series-input structure distributes the switch voltage stress, which makes it suitable for high input voltage applications. Moreover, since two forward converters share one active-clamp circuit for the transformer reset, its primary structure is simplified. In addition,...
A lumped equivalent circuit model for the radial mode piezoelectric transformer is presented, based on a one-dimensional analysis of the radial vibration mode and the constitutive piezoelectric equations. The model allows each of the components in the piezoelectric transformer equivalent circuit to be calculated from the appropriate material properties and device dimensions, thereby facilitating the...
A new interleaved active-clamp forward converter with parallel input and series-parallel output is proposed in this paper. With the proposed topology the secondary windings of the transformers work in series when the input voltage is low but in parallel when the input voltage is high. Therefore, the duty cycle is not limited within 0.5 and the steady state conversion gain of the converter can be improved...
This paper presents a quasi-Z-source inverter (qZSI) that is a new topology derived from the traditional Z-source inverter (ZSI). The qZSI inherits all the advantages of the ZSI, which can realize buck/boost, inversion and power conditioning in a single stage with improved reliability. In addition, the proposed qZSI has the unique advantages of lower component ratings and constant dc current from...
Due to the thin structure employed in planar packaging, the high electric field intensity may occur inside the power module, leading to degradation of the dielectric performance. To resolve this issue, the Metal-Posts-Interconnected Parallel Plate Structure (MPIPPS) is used to reduce the high field concentration in the power module. However, the high bonding joint in MPIPPS will cause high thermo-mechanical...
Hybrid vehicle traction applications require compact power modules with high reliability. A major challenge is the lifetime under thermal cycles. While the requirements are moderate with respect to (active) power cycles, there are challenging requests for a high lifetime under (passive) temperature cycles. Base plates and solder interfaces limit the stability for temperature cycles in the classical...
Active clamped asymmetrical dual switch forward (ACADSF) converter is a preferable candidate standard dc-dc module for high line and wide range input application in low to medium power rating systems. To make the ACADSF be more suitable for practical applications, a novel ACADSF converter was proposed, which, compared with original ACADSF, maintains the advantages that duty cycle can be more than...
This paper proposes a push-pull forward (PPF) three-level (TL) converter, which is suitable for low and wide-range input voltage applications, such as fuel cell power system. Half of the switches sustain half of the input voltage, and the others sustain one and one-half input voltage. Input ripple current and output filter inductor ripple current can be reduced with the TL waveform of the secondary...
A novel wide range input front-end dc-dc converter featuring in optimized overall input range efficiency is presented in this paper. This proposed converter combines the two kinds of dual switch ZVS forward-flyback topologies together, while the DC Gain for these two kinds of forward-flyback topologies is different and that of secondary full-bridge rectifier is doubled than current-doubler rectifier...
This paper begins by illustrating the issue of switch stresses on synchronous rectifiers (SRs) which happens during the hot plug-in and plug-out operation turn on and off moment of the synchronous rectification in isolated non-regulated Dc-Dc converters, such as the single stage unregulated bus converter. Next, full analysis of the working principle of this unfavorable phenomenon is presented theoretically...
A Zeta mode three-level AC/AC converter is proposed, the converter is available in high input voltages as well as in high power applications, and it also intended for use in applications where a sinusoidal output voltage of high quality is needed. It realizes the three-level voltage waveforms before output filter, which can get a better spectrum and reduce bulk of the filter. Compared with non-isolation...
A new ZCS-PWM dc-dc full-bridge boost converter is proposed in the paper. The proposed converter is well-suited to be used as a fuel cell converter where low input voltage / high output voltage conversion is required. In the paper, the operation of the proposed converter is explained in detail, and its features and design are discussed. The feasibility of the converter is confirmed with results that...
A conventional active-clamp forward (ACF) converter is a favorable candidate in low-to-medium power applications because of its simple structure and zero-voltage switching (ZVS) capability. However, high voltage stress on switches, i.e., sum of the input voltage and the reset capacitor voltage, does not make it suitable for high input voltage applications such as a front-end converter of which the...
This paper illustrates the rectifier stress issue of the active clamped dual switch forward converters operating on discontinuous current mode (DCM), and analyzes the additional reverse voltage on the rectifier diode of active clamped dual switch forward converter at DCM operation, which does not appear in continuous current mode (CCM). The additional reverse voltage stress, plus its spikes, definitely...
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