|Title:||Power delivery to remote sensors over optical fiber|
Hong Kong Polytechnic University -- Dissertations
|Department:||Faculty of Engineering|
|Pages:||ix, 69 leaves : ill. ; 30 cm.|
|Abstract:||Energy transmission over optical fiber offers many advantages comparing with electric power distribution systems using metallic cable. Optical fiber is essentially electric passive and can work in hazardous environment. It has much lower power losses over long transmission distance, and it is also lighter and requires less space comparing with its metallic counterpart. Therefore, optical power transmission system has found more and more use in many areas. This dissertation first introduces the operating principle of optical power transmission system. Then the main factors affecting the efficiency of optical fiber transmission system, such as coupling efficiency, fiber loss and the conversion efficiency of photoelectric converter are discussed in detail. Analysis of factors contributing to the loss of the optical power transmission system is given. The basic structure of optical power transmission system is described. Key components of the optical power transmission system including LD driving circuit, optical power conversion devices, and energy management circuit are discussed. The operating principles of the LD driving circuit and boost circuit are then discussed in detail. These include constant current driving principle, TEC temperature control principle, PWM control principle and the principle of boost circuit. The LD drive circuit and Boost circuit design are presented.|
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