Abstract
A switched capacitor based AC-DC resonant power converter is proposed for high frequency power generation output conversion. This converter is suitable for small scale, high frequency wind power generation. It has a high conversion ratio to provide a step down from high voltage to low voltage for easy use. The voltage conversion ratio of conventional switched capacitor power converters is fixed to n, 1/n or −1/n (n is the switched capacitor cell). In this paper, A circuit which can provide n, 1/n and 2n/m of the voltage conversion ratio is presented (n is stepping up the switched capacitor cell, m is stepping down the switching capacitor cell). The conversion ratio can be changed greatly by using only two switches. A resonant tank is used to assist in zero current switching, and hence the current spike, which usually exists in a classical switching switched capacitor converter, can be eliminated. Both easy operation and efficiency are possible. Principles of operation, computer simulations and experimental results of the proposed circuit are presented. General analysis and design methods are given. The experimental result verifies the theoretical analysis of high frequency AC power generation.
Highlights
Energy crises and environmental concerns give rise to the need to save energy
Electric voltage from wind generators are usually AC based whereas general appliances are DC based such as computers, light emitted diode (LED), audio and video equipment
It provides another conversion ratio, 2n/m, which makes the voltage conversion range wider and more flexible. It lessens the disadvantage of the switched capacitor based power converter. It consists of only two switches and a number of switched capacitor cells depending on the output voltage required
Summary
Energy crises and environmental concerns give rise to the need to save energy. A lot of researchers have looked into renewable sources to find solutions; others focus on building new power architecture to meet the competing requirements in the aspects of performance, efficiency, and cost. In [12], a switched capacitor based AC-DC converter suitable for small-scale wind power generation systems is proposed to obtain both rectification and high voltage gain. Higher charging and discharging current spikes could be decreased by introducing small resonant inductors [6], which significantly reduce the power loss and increase efficiency. A family of novel resonant converters is presented It is based on switched capacitor step up/down cells which maintain the characteristic of high power efficiency to overcome the drawbacks of. It consists of only two switches and a number of switched capacitor cells depending on the output voltage required Both switches are operating under the zero current switching condition by the resonance of the capacitors and an introduced small inductor. It will eliminate current spikes when capacitors are charging and discharged
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