[[alternative]]The Research of Transformer applied to

碩士機電工程學系[[abstract]]在本篇論文中，我們探討關於變壓器於低頻信號傳輸的相關研究，信號是採用脈衝寬度調變方式，針對其研究動機、方塊架構、電路架構以及市面上產品的應用進行逐一分析及探討。根據其他脈衝寬度調變的設計應用概念，我們設計出不同的應用系統架構。利用OrCAD軟體模擬後級的低通濾波器，藉此瞭解濾波器不同的設計與應用，設計出適合實驗電路的濾波器，如何將脈衝寬度調變模式調變的信號濾除。 電感性元件無法傳輸直流，如一般的動圈式喇叭工作在低頻時效能是不佳的，而變壓器是可用來做阻隔直流的應用。當變壓器應用於音頻信號傳輸須對變壓器的設計與原理的瞭解。由於一般理論上，電感性的零件於低頻信號上的表現是不佳的，在音響系統中若要其低頻響應佳，所需成本與體積會相對的提高。在此，我們探討利用脈衝寬度調變模式的傳輸音頻信號，以提升其變壓器本身的低頻頻寬響應，為驗證所求，變壓器的設計上並不考慮升壓的功能，並對電路進行實驗，驗證以脈衝寬度調變模式的傳輸電路的可行性，也為未來研究建立基礎。 在論文實驗中，採用脈衝寬度調變傳輸的調變方式下，變壓器可以傳輸的頻率是可以更寬廣的，其低頻傳輸的範圍可以更廣。由實驗結果，可以看出當用阻抗比在65:8的變壓器傳輸時，它的低頻響應會變的較廣，並且能讓信號傳輸由極限100Hz 推展到5Hz的範圍。[[abstract]]In this paper, we discuss some reference research about the low-frequency signal transmission of transformer which use the way of pulse width modulation (PWM). The paper will focus on research motif, the construction of block, the construction of electric circuit and we will analyze and discuss the products application of market conditions step by step. We design some different constructions of system application; the idea is according to others PWM concept and using OrCAD software to simulate the post level of low pass filter. So that we can understand the different design and application of filter, that will help us to design adaptable testing electric circuit and how the sound signal will be filtered out by modulation transfer of PWM mode. Inductance components are unable to transmit direct current. The common moving coil type loudspeaker works in the low frequency period and that performance is not good; however the transformer can be used to cut off the direct current application. It is necessary to understand the design and principle of transformer when it is applied to audio signal transition. As a result of generally theory, the performance of inductance components is not good on low frequency signal. If it’s the low-frequency response want to be good in stereo system, the cost and volume will be enhanced relatively. Therefore; we discuss that using PWM mode to transfer audio signal in order to enhance transformer itself low-frequency response. In order to verify the request, the transformer does not consider performing boost function and carry on the electric circuit experiment to verify the feasibility of transmission circuit by using PWM mode directly. So that can establish the foundation for following research in the future. During the experiment of this paper, that adopts PWM transmission of modulation transfer way. The transformer can transmit wider frequency and its low frequency range also become wider. After the experimenting result, we can understand when resistances ratio in 65:8 of transformer is used to transmit, its low-frequency response will become wider and transmitting signal limitation could be extended from 100Hz to 5Hz range