| Summary: | 博士 === 國立臺灣科技大學 === 電子工程系 === 95 === Abstract
Two-output power converter topology are widely used in the power electronics applications. However, the cross regulation between the two outputs in steady state DC level has confused the engineers in the long past. The design issues normally involve iterative trial-and-eror processes for the engineers to come up with no more than a fair result.
In this dissertation, the non-ideal characteristics in the secondaries of a double-output power converter are discussed. Also the effects to the cross regulation of the double outputs are addressed and the design considerations to solve the above problem are proposed. From the results, a rectangular-axis method for graphically determining the ratio of the feedback weighting gains and the secondary turns ratio is presented. The output specifications are plotted on a VO1-VO2 plane. The equivalent circuit models of the secondaries are examined to check if the output specifications can be met. Moreover, feedback methods are described, including three feedback schemes to improve the failure of cross regulation caused by the errors of the components which were operated in converters.
Finally, half-bridge and forward converters are respectively implemented in the laboratory. The three feedback schemes are presented and the two output voltages located in the correct lines of the feedback theorems.
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