雙輸出直流交流轉換器

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

110149744

專利證號

I 809638

專利獲證名稱

雙輸出直流交流轉換器

專利所屬機關 (申請機關)

國立中山大學

獲證日期

2023/07/21

技術說明

一般的直流交流轉換器中，都是以半橋式電路為基礎，透過一鋸齒波及相位參考訊號產輸入比較器中比較後，產生脈波寬度調變（Pulse Width Modulation, PWM）訊號，再透過此PWM訊號去控制功率電晶體的開關，並對輸出級的電感、電容及負載進行充放電。若需要產生兩組不同相位的就需要加入兩組比較器產生兩組不同相位之PWM訊號且輸出交流電壓振幅也需透過疊加電路來達成。本設計僅使用一組比較器，透過非重疊訊號訊產生器，將比較器產生的PWM訊號變為兩組反相的PWM訊號，再透過升壓電路提升電壓準位，用於驅動下一級的高壓功率電晶體，透過此技術產生兩組相位差180度的交流電壓，且升壓電路提升的電壓由外部輸入，故可以控制想提升的電壓準位，進而影響輸出的電壓。 In general DC/AC converters, half-bridge circuits are used as the basis. After inputting a sawtooth wave and phase reference signal into the comparator, it generates a Pulse Width Modulation (PWM) signal. Then use this PWM signal to control the switching of the power transistor, and then charge and discharge the inductors, capacitors and loads of the output stage. If we need to generate two different phases AC signal, we need to add other comparators to generate two PWM signals with different phases, and we get the higher AC voltage amplitude by stacking the whole circuits. In this design, we only use one comparator. We can get two different phases’ PWM signal by using an non-overlapping circuit. Then use a Voltage Level Converter(VLC) to get the high level voltage, which is used to drive the high-voltage power transistors. By using this technology, two AC voltages with a phase difference of 180 degrees will be generated. In addition, the voltage of VLC is given from the outside, so the voltage level can be controlled, so the output voltage can be controled.

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