本論文旨就應用於伺服器電源系統中之高壓直流電源分配轉換器，此轉換器是由功率因數修正轉換器與隔離高壓直流轉換器兩級電路建構，其目的是將交流電壓轉換高壓直流電輸出，經由輸出匯流排分配電力，並透過各級直流降壓轉換器分別供電於伺服器和網絡設備上。故針對電源分配轉換器於交流電應用電壓範圍與負載變動之兩種情況下，提出可調中介直流電壓控制策略並透過雙迴圈控制進行中介直流電壓調整，來達到此電路架構之導通率最佳化，俾以提升整體電源轉換器效率。文中利用所擬可調中介直流電壓控制策略，藉由高壓直流電源分配轉換器之 230 Vrms ± 20%應用範圍條件和圖騰柱功率因數修正轉換器架構下，若固定中介直流電壓，輸入交流電壓較高時，導通率越小會使得整體效率不佳，甚至也會讓功率因數變得更差，所以在輸入交流電為 277 Vrms時。中介電壓會從原 430 Vdc 直接提高至 450 Vdc，來使得導通率變大，得以提升效率與功率因數。其次於重載之情況下，隔離高壓直流轉換器若維持相同中介直流電壓，導通率越大會使得整體效率不佳，亦需要提高中介電壓，使得導通率變小，得以提升效率。並透過負載電流訊號進一步利調整開關間延遲時間，且配合 GaN MOSFET 的寬能隙特性，降低開關切換損更有效提升整體系統效率。文末為了驗證所提之控制策略之可行性，將透過電路模擬軟體驗證此控制策略下之電路穩定度及在動態負載的情況下，可有效地達到中介直流電壓之調整，並實作電路驗證本文所提之控制策略，可讓兩級電路架構之整體系統，於動態負載情況下，可快速調整中介直流電壓與動態開關延遲時間，實驗結果得知所提之控制策略可有效地提升效率。

This dissertation aims to apply a high-voltage DC power distribution converter in server power systems. The converter is constructed by a power factor correction (PFC) converter and an isolated high-voltage DC converter, with the purpose of converting AC voltage to high- DC voltage, distributing power through the output bus, and supplying power to servers and network devices through DC buck converters. Therefore, for the power distribution converter under two conditions of AC voltage range and load variation, an adjustable intermediate DC voltage control
strategy is proposed, and intermediate DC voltage adjustment is performed through dual-loop control to optimize the duty cycle, thus improving the overall efficiency of the power converter. By using the proposed adjustable intermediate DC voltage control strategy, under the application range condition of 230 Vrms ± 20% of the high-voltage DC power distribution converter and using the topology of totem-pole PFC converter, if the intermediate DC voltage is fixed, the smaller the duty cycle will be when the input AC voltage is higher, resulting in poor efficiency
and even worse power factor. Therefore, when the input AC voltage is 277 Vrms, the intermediate voltage will be directly increased from the original 430 Vdc to 450 Vdc to increase the duty cycle, thereby improving efficiency and power factor. Secondly, under the condition of heavy load, if the isolated high-voltage DC converter maintains the same intermediate DC voltage, the duty cycle is larger and resulting in poor overall efficiency. Therefore, we need to increase the intermediate voltage to decrease the conduction rate and improve efficiency. By further adjusting the dead time between switches based on the load current signal and the wide bandgap characteristics of GaN MOSFET, the switching loss can be reduced to effectively improve the overall system efficiency. At the end of the dissertation, in order to verify the feasibility of the proposed control strategy, the circuit simulation software will be used to verify the stability of the circuit under this control strategy and the effective adjustment of the intermediate DC voltage under dynamic load. The control strategy proposed in this paper will be implemented in the circuit for verification, which enables the overall system of the two-level circuit structure to
quickly adjust the intermediate DC voltage and dynamic dead time under dynamic load. The experimental results show that the proposed control strategy can effectively improve efficiency.

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