| Summary: | 碩士 === 崑山科技大學 === 電子工程研究所 === 96 === This text proposes a circuit that is suitable for digital modulation power control in alternating current, The circuit adopts a phase modulation technology, by detecting the alternating current with crossing the zero point signal using a hardware circuit; Furthermore we design a CPLD chip, which can be used to compare to the received digital control signals, the produce P.P.M signal to control the phase angle of TRIAC. Finally we can achieve the goal of controlling output power in alternating current. By adopting the method as this text proposed, it can improver traditional problem which is unable to adjust the power, or modulate the power step by step using resistance and inductance load (such as the light bulb and electric fan) , Finally, it can improve the stepless of power adjustment , with wired or wireless digital signal process, which can provide the convenience using resistance and inductance load.
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