本文旨在研製應用於電梯電力儲能系統之雙向直流-直流轉換器，此轉換器可對電池進行充放電，並以數位控制實現充放電策略。電路由兩級雙向直流-直流轉換器組成，電路之架構前級採用全橋LLC諧振式轉換器，該級轉換器作為一直流變壓器，採用固定操作頻率70 kHz且固定責任週期50 %之開迴路控制，由於其一次側開關零電壓切換特性，可以減少切換損失；後級採用交錯式降/升壓轉換器，透過此級轉換器做電壓調變，並聯兩組降/升壓轉換器降低單組負載，進而降低導通損失，並採用交錯式控制降低電流漣波。最後實作完成一台高壓側直流電壓280 V至450 V，低壓側直流電壓38 V至59 V，最大功率2.66 kW之雙向隔離型直流-直流轉換器。

This thesis aims to develop a bidirectional DC-DC converter for en-ergy storage system of lift. This converter can charge and discharge the battery. Using digital control to implement charge/discharge strategy. The prototype circuit consists of two-stage bidirectional DC-DC converters. The first stage using full-bridge LLC converter as a DC transformer. It adopts open loop control with a fixed switching frequency and a fixed duty cycle. The switching loss can be reduced due to the characteristic of zero voltage switching. The second stage using interleaved buck/boost con-verter and doing voltage regulation. The conduction loss is reduced due to parallel two set of buck/boost converter. The output current ripple is re-duced using interleaved technique. Finally implement a bidirectional DC-DC converter with high side voltage of 280 to 450 Vdc, low side voltage of 38 to 59 V, output maximum power of 2.66 kW.

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