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Conventional cell equalizers derived from dc-dc converters consist of numerous switches, sensors, or transformers; thus, their cost and circuit complexity are high. In this paper, Cockcroft-Walton charge equalizers consisting only of capacitors, diodes, and an ac power source are presented. In addition, a novel charge equalizer that outperforms the Cockcroft-Walton charge equalizers is proposed. The...
We use DSP to construct an intelligent Lithium-ion battery charging system. By adopting this intelligent charging system, we perform the data collection, calculation and peripheral circuit control for the battery charging status. According to the lithium-ion battery charging specifications, two hours are required for battery charging. A fuzzy controller constructed using the battery protection voltage...
The commercially available sensor nodes are battery-driven devices. A number of nodes together constitute a network. As days proceed, the batteries used in the nodes lose their charge and subsequently get isolated from the network. Many energy harvesting schemes have been proposed to alleviate this problem. In this paper, a solar energy based energy harvesting scheme is proposed. This scheme works...
By using the piezoelectric direct effect, piezoelectric energy harvesters hold the promise of providing an alternative power generating device. Also, ambient vibration is the focus to provide the amount of available mechanical energy resource that can be converted into electricity by piezoelectric ceramics. Design and analysis of the piezoelectric unimorph ceramic and electric converter as well as...
The benefits of enhanced condition monitoring in the asset management of the electricity transmission infrastructure are increasingly being exploited by the grid operators. Adding more sensors helps to track the plant health more accurately. However, the installation or operating costs of any additional sensors could outweigh the benefits they bring due to the requirement for new cabling or battery...
As proven in literature, the Z-loaded rectifier is an alternative topology for PFC applications requiring wide output voltage controllability. The main advantage of the Z-rectifier is the availability of two control signals allowing buck-boost operation. This raises the possibility of regarding the Z-rectifier as a novel single-stage PFC converter with ripple-less output regulation, whereby one control...
The energy systems based on renewable resources face several acceptance difficulties mainly due to high initial costs and to low final incomes. A way to improve the effectiveness of these systems is the use of more than a source of energy, mainly when the employed sources present some type of complementarity. An interesting combination is obtained with the use of hydro and solar energy resources,...
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