本文主旨在於研製一個軌道牽引變流器相位模組之測試系統，由切換式整流器與雙向dc-dc轉換器建構成此一測試系統。藉著使用脈波寬度調變（pulse width modulation）技術，使得該測試系統提供給待測相位模組一個與實際使用相同之電氣環境。在這些情況下，待測相位模組的介電與導電能力可以被估測出來，而不需煩雜的實測。為了改善測試系統的功率品質，前級的切換式整流器提供了直流鏈電壓。後級雙向dc-dc轉換器是由降壓式與升壓式轉換器串聯而成，其功能如用一個可控的交流電流源來做導電的測試，且只有少量的功率消耗。本文中謹慎的計算分析系統中各個元件的效率和功率消耗，如二極體、開關、電容與電感。本文的測試系統是由數位信號處理器（TMS320F2812）來控制，根據測試的狀況，提供適當的PWM信號給開關元件。經由模擬與實作的結果可證明本文所提出的測試系統的可行性，且測試的規格為電壓1000伏特、電流10安培。

The purpose of this thesis is to implement a testing system of phase modules which are used in railway traction inverters. The proposed testing system is composed of a switch-mode rectifier（SMR）and a bidirectional dc-dc converter. By using pulse-width-modulation technique, the testing system provides electrical conditions that are simular to real operation for the under-tested phase modules. Under these conditions, the dielectric and conducting capabilities of the under-tested phase modules can be assessed without troublesome field test. To improve the power quality of the testing system, a single-switch SMR is deploied at the front stage which provides the dc link voltage. Cascading a buck and a boost converters to form a bidirectional dc-dc converter, the second stage works as a controllable ac current source for the conducting testing with only few power consumption. For evaluating system efficiency, consumption of each element, such as diodes, switches, capacitors, and inductors, is analyzed carefully in this thesis. The testing system is controlled by a digital signal processor（TMS320F2812）, which provides the suitable PWM signals for the switches in the system according to the testing conditions. Both simulation and experimental results are shown in this thesis to verify the validity of the proposed testing system. The testing specification of this system is based on the voltage of 1000V and the current of 10A.

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