高效率正弦波電壓輸出之電源轉換裝置POWER CONVERTING DEVICE WITH HIGH POWER TRANSFORMATION EFFICIENCY

專利類型

發明

專利國別 (專利申請國家)

美國

專利申請案號

12/470,246

專利證號

US 8,198,882 B2

專利獲證名稱

高效率正弦波電壓輸出之電源轉換裝置POWER CONVERTING DEVICE WITH HIGH POWER TRANSFORMATION EFFICIENCY

專利所屬機關 (申請機關)

弘光科技大學

獲證日期

2012/06/12

技術說明

一種轉換裝置，適用於將一呈直流的一輸入電壓轉換成一呈交流的輸出電壓且包含：一耦合電路、一箝制開關、一箝制二極體、一整流二極體、一全橋電路及一輸出電路。全橋電路包括一第一開關、一第二開關、一第三開關及一第四開關。輸出電路包括一輸出電容。當第一開關和第四開關導通時，該輸出電容被充電，以使該輸出電壓呈現弦波的正半週。當第二開關和第三開關導通時，該輸出電容被反向充電，以使輸出電壓呈現弦波的負半週。所有開關及二極體皆有柔性切換，且開關之電壓抑制與輸入電源電壓相同，因此可以降低導通損失以達到高轉換效率。 Therefore, maintaining cell voltage at an equalized charging/discharging level is significant for enhancing battery life. The design example for the series-connected LiFePO4 battery strings with 60Ah and 40Ah was conducted to achieve the predicted equalizing performance. The proposed duty control method by the simulation result can reduce the equalization time compared to the conventional equalizing process and maintain safe operation for each LiFePO4 cell in the battery strings during the charging/discharging state. The circuit has the advantage with active clamping and low conduction, such that the energy transfer efficiency can be achieved 96% . The object of this patten is to develop a new battery management system to accomplish high performance fast charge/discharge circuit with balance control for LiFePO4 battery. This circuit with few elements by duty control can fast balance the series-connected battery stack under a high charge/discharge current. The electric vehicles are friendly environment that power bill are consumed only 10% of gasoline car. However, the battery life cycle affect the total cost for the driver. The voltage of battery stack level for e-scooter and electric vehicles are 48V and 250V that require LiFePO4 battery in series amount are 16 and 80, respectively. Imbalanced cell voltage will cause overcharge or over discharge, and decrease the total storage capacity and total cycle life of the battery.

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