| Summary: | 碩士 === 國立彰化師範大學 === 電機工程學系 === 95 === This thesis is aimed to investigate the effects of the magnetizing inductance of the isolating transformer on the forward converter. Thus in the beginning of the circuit analysis, the magnetizing inductance is added in the forward converter small-signal model to derive the transfer functions of the control-to-output, the current-loop gain, and the audio-susceptibility. Next, with the deduction the frequency responses of the amplitude and the phase for the three transfer functions are simulated by using the MATHCAD software. Finally, base on the set values from the simulation result, an experimental forward converter circuit is designed, and the control-to-output and the audio-susceptibility are measured practically. With the comparison of the simulation and the experimental results, the accuracy of the small-signal model containing the magnetizing inductance is verified. Also, the similarity and the difference of the effects of the magnetizing inductance and the external ramp on the forward converter are clarified.
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