以數位化實現具隔離高升壓比之雙向直流-直流轉換器

本論文是以數位功率控制來實現具隔離高升壓比之雙向直流-直流轉換器。所提轉換器於低壓側採用推挽式而高壓側則使用全橋架構，可提供12V與400V之直流電壓作為自動門所需之12V電池備用電源功率模組。高壓側是使用續有零電壓切換之全橋相移電路對低壓側之電池進行充電。另外，於電池輸入端加入一LC低通濾波器以改善電池之充電品質。電路在放電模式時可經由功率晶體之並接二級體做為整流電路提供400V之直流電壓輸出。在放電模式下為安置LC低通濾波器之電感續流問題與降低變壓器之升壓比，因此採用電流饋入之推挽式電路。另外，為進一步改善效率與提高可靠度，於變壓器高壓側外加電容、功率開關並與變壓器漏感組成ㄧ只諧振電路，使低壓側電路具有零電流切換之功能。為驗證所提轉換器之有效性，因此以數位訊號處理器為核心建構數位功率控制器，提供120W/12V/400V之輸出。為縮短軟體執行時間所提之控制策略都以組合語言撰寫。最後，由實驗結果證明所提之雙向直流-直流轉換器之功能合乎需求。

關鍵字

零電流切換；雙向直流-直流轉換器；寄生電容

並列摘要

In this thesis, an isolated bi-directional DC-DC converter with high voltage ratio transformer, which provides both 12V and 400V DC voltage as 12V battery back-up power module for automatic door application, is realized by digital power control. The low-voltage side and high-voltage side of the proposed converter are realized by push-pull and full-bridge circuit structure respectively. A phase-shift full-bridge circuit with zero-voltage switching is utilized in high-voltage side of transformer as a charging circuit. An LC filter is added between in the entry of battery to improve the battery charging quality. For discharging mode, the paralleled diodes of power switches in full-bridge are used as a rectifier to yield 400V DC voltage. In order to perform continuous current conduction of inductor and reduce the voltage ratio of transformer, a current-fed push-pull control is proposed in battery discharging mode. As to efficiency and reliability improvement, a resonant circuit constructed by a leakage inductance of the transformer, a external capacitor and a power switch is performed in high-voltage side of transformer to yield zero current switching in low-voltage side circuit under discharging mode. In order to verify the effectiveness of the proposed converter, a DSP-based digital power controller is established to provide 120W power with 12V and 400V DC voltage. All the control algorithms are implemented by assembly language to shorten the execution time. Finally, some experimental results are provided to show its successful operation.

並列關鍵字

zero-current-switching ； bi-directional DC-DC converter ； parasitic capacitance

參考文獻

[21]李奐侖，「燃料電池用之具有複合能量調控直流-直流轉換器研製」，國立台北科技大學電機工程系碩士學位論文，民國98年八月。

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國際替代計量

以數位化實現具隔離高升壓比之雙向直流-直流轉換器

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