Remote low-power supply provision for HVDC devices (original) (raw)
The applications of ultrasound, in the context of power transmission, range widely from cleaning industrial tanks to various machining processes e.g. drilling and cutting, having even been employed for low temperature welding of thermoplastics and metals. High intensity ultrasonic waves have demonstrated the ability to produce permanent changes in certain materials lying in the irradiated region. This hints at an untapped potential for Contactless Energy Transfer (CET) over galvanic isolation barriers. The use of high frequency sound waves affords numerous practical advantages apart from the obvious, absence of audible noise. Transmitters of comparatively smaller dimensions can radiate well-bounded beams which can be directed precisely over a desired region, and due to their ‘quasi-optical’ nature, these waves can be focused with appropriate lenses and concave reflectors. This concentration of high levels of acoustic pressure/particle velocity in a small spatial region allows for high energy and power densities. (Kuttruff, 1991, p. 395) The study of acoustic isolation in electrical systems is still in its stage of infancy, and experiments conducted for different applications have yielded a large variation in efficiencies and power levels. Where biomedical applications typically transmitted microwatt power levels through optical fibers at 1% efficiency, through-wall systems achieved 1kW transfer at 84% efficiency. (Roes et al, 2013) Studies aimed at inspecting wave patterns and loss mechanisms, using non-optimised transducers and circuits, transferred 37µW at 53% efficiency. (Roes et al, 2011) This project will investigate whether Acoustic Energy Transfer (AET) can deliver the level of power needed to drive the gate terminal of an IGBT, by examining the different mechanisms involved in the power transfer process. By providing insights into the underlying phenomenon, this report aspires to pave the way for further research into enhancing AET efficiency, thereby making it a viable means of CET.
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State-of-the-Art Developments of Acoustic Energy Transfer
International Journal of Antennas and Propagation, 2016
Acoustic energy transfer (AET) technology has drawn significant industrial attention recently. This paper presents the reviews of the existing AETs sequentially, preferably, from the early stage. From the review, it is evident that, among all the classes of wireless energy transfer, AET is the safest technology to adopt. Thus, it is highly recommended for sensitive area and devices, especially implantable devices. Though, the efficiency for relatively long distances (i.e., >30 mm) is less than that of inductive or capacitive power transfer; however, the trade-off between safety considerations and performances is highly suitable and better than others. From the presented statistics, it is evident that AET is capable of transmitting 1.068 kW and 5.4 W of energy through wall and in-body medium (implants), respectively. Progressively, the AET efficiency can reach up to 88% in extension to 8.6 m separation distance which is even superior to that of inductive and capacitive power trans...
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