Abstract
By the negative influence of parasitic parameters from the components, the voltage step-up capacity of basic dc-dc converters is limited at extremely high duty cycle. Which makes the traditional dc-dc converters are difficult to be applied to renewable energy generation systems such as fuel cell and photovoltaic (PV) systems. In this study, a single-switch high step-up Zeta converter is proposed based on the basic Zeta converter and corresponding coat circuit. By using the coat circuit, the proposed converter not only can achieve higher voltage gain, but also acquire lower voltage stress on the semiconductor devices. Therefore, the devices with lower conduction resistances can be used to improve the efficiency. Furthermore, the coat circuit is composed of passive components, which does not change the continuous output current characteristic of the basic Zeta converter. And the proposed converter has only one active switch, the drive and control circuits are simple. The operation principle and the performance analysis of the proposed Zeta converter are described in detail, and a 300 W closed-loop experimental prototype has been developed for verification.
Highlights
With the exacerbation of a series of global problems such as the greenhouse effect and environmental pollution, the grid-connected generation systems of renewable energy such as PV and fuel cell systems have been rapidly developed and deployed [1]–[6]
The isolated dc-dc converters can obtain the capacity of high voltage step-up by changing the turn ratio of transformers [7], [8]
Equation (7) states that the voltage gain M of the presented Zeta converter can be adjusted by changing the quantities of basic cells
Summary
With the exacerbation of a series of global problems such as the greenhouse effect and environmental pollution, the grid-connected generation systems of renewable energy such as PV and fuel cell systems have been rapidly developed and deployed [1]–[6]. The high voltage gain converters with switched capacitor structures have some basic disadvantages such as complex driving circuit and many active switches [14]–[16]. A single-switch high voltage gain dc-dc Zeta-derived converter has been proposed in [24]. A single-switch buck-boost converter with high voltage gain has been presented in [26]. The aforementioned converters have the common drawback that the circuit structures are not easy to expand, which limits the capability of voltage step-up. Compared to the classical buck-boost converter, the converter presented in [28] can improve the voltage gain with lower voltage stress on the devices by using the scalable voltage multipliers.
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